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TOOL & MOLD STEEL
04 Manufacturing Process
06 Cold Work Tool Steel_STD11/SKD11
08 Cold Work Tool Steel for High Tension Steel Plate Processing_TD1
10 Hot Work Tool Steel_STD61/SKD61
12 Hot Work Tool Steel for Die Casting_DC1
14 Plastic Mold Steel_TP1, TP4, TP4M
16 High Gloss Precision Plastic Mold Steel_SMAT 1
18 Precision Plastic Mold Steel with Excellent Machinability_SMAT E
22 Flame Hardened Tool Steel_PST23F85
24 Pre-hardened Tool Steel_SKT4(V)
26 Forged Rolls
28 Specifications
32 Classification of Tool Steel
33 Product Size
34 Packing Types
35 Tag & Label, Certificates of Approval, Order Requirements
Contents
Our constant mission is to open a door to the fu-ture of the global special steel industry.
From high-tech industries including power gen-eration, petrochemicals and semiconductors to futuristic industries such as nuclear power and aerospace, SeAH CSS is growing into a leader in Stainless steel, Tool steel, and Ni-alloys.
With our products, we aim to raise the level of customer satisfaction and set up the new indus-try standard by constantly challenging ourselves.
SeAH CSS’s constant mission: Creating new value from steel for the world
04/1966 Founded as Samyang Special Steel Co., Ltd.
12/1977 Completed a general special steel plant as
Korea Specialty Steel Co., Ltd
(for round bars, steel pipes and plates)
06/1982 Changed its name to SAMMI
General Special Steel Co., Ltd
04/1991 Opened its second special steel plant
(for steelmaking, rolling, processing)
02/1997 Annexed to POSCO Group
(for round bars and pipe business)
10/2006 Completed the 1st phase of its facility
rationalization
(AOD, HV Mill, Second acid cleaning plant and more)
02/2007 Renamed Changed its name to
POSCO Specialty Steel Co., Ltd
04/2012 Completed the 2nd phase of its facility
rationalization
(60ton EAF, Bloom Caster, SBM and more)
03/2015 Acquired by SeAH Group and changed
its name to SeAH Changwon Integrated
Special Steel Co., Ltd
History
Manufacturing ProcessTool & Mold Steel 05SeAH Changwon Integrated Special Steel
Ingot Casting ESR CCR9,000ton Press FurnaceFBMRFM
EAF
Heat Treatment
Centerless Grinding
Cold Drawing
Straightening
9,000ton Press
BMSBM
CCR
FBM
VIM ESR / VAR
EAF LF
Ingot
Bloom Caster
VD
Heating
Heating
Roughing Mill(H-V type)
Heating Precision Size Block(3Roll)
Intermediate Mill(3Roll)
2,200ton PressHeating RFM
MT
ECT, TOM, MLFT
Peeling
Round Bar
Flat Bar
Wire Rod
Roll
UT (Ultrasonic Testing)
Cold Work Tool Steel_STD11/SKD11[Equivalent to D2 (ASTM)& WNR1.2379 (DIN)]
Applied to tool materials manufactured in a cold state.
Applications
Product Characteristics
High Cleanliness Exceptional wear resistance
Uniform Microstructure Uniform hardness Extra hardness
H-Carbon and H-Chrome Steel provide extra hardness, excellent wear resistance and low dimensional change.
Chemical Composition
GradeChemical composition rate (Wt, %)
C Si Mn P S Cr Mo V
SKD111.401.60 0.40 0.60 0.03 0.03
11.013.0
0.801.20
0.200.50
Heat Treatment Conditions
Distribution of Heat Treatment Hardness
TTT Curve Dimensional Change after Heat Treatment
Microstructures
Spheroidizing Annealing Quenching &Tempering
Quenching hardness: HRC 61 ~ 65 /2nd hardening occurs in the range of 400~530°C.
Spherical cementites and eutectic carbides in ferrite matrix Tempered martensites and carbides
Oil Quenching
Tempering Temperature(°C)
Quenching and Tempering Heat Treatment Cycle
Holding Time
150~200°C500~530°C
980~1030°C Oil Cool
700~750°C
Pre HeatingAir Cool Air Cool
200°C50~80°C
Slow Heating
0.6hr/30mm 1hr/30mm 1hr/15mm 1hr/15mm
150~200°C500~530°C
Tempering(2 Times)Quenching
0 100 200 300 400 500 600
50
40
45
55
60
65
70
1050°C
975°C 1000°C
1025°C
Tem
pera
ture
(°C )
1 60second 60minute 60hour
800
700
600
500
400
300
200
100
A + F + C
A + F + C F + CAustenite
Ms10%30%70%
80%50%90%
A-AusteniteF-FerriteMs-Martensite Start TemperatureC- CarbideM-Martensite
25㎛
Stra
in Ra
tio(%
)
Tempering Temperature(°C)
Quenching 1030°Cx40min Air Cooling A Specimen B Specimen
100 200 300 400 500 600-0.15
-0.10
-0.05
0
0.05
1.10
0.15
0.20
40
As Quenching
ThicknessThickness
Length
Width
Width
Length
Press moldPress moldPress mold
07SeAH Changwon Integrated Special Steel
Time
Tem
pera
ture
(°C )
10㎛
Shear Knives
Tool & Mold Steel
Har
dnes
s(H
RC)
Applicable molds SKD11 durability enhancement rate Work material
Center Pillar Outer 135% DP980 1.6t
Steel Wheel 165%HR580/330Y-DP
Door Hinge 110% HR340LA, 4.0t
Wear Resistance Galling Resistance
Wea
r Val
ue
Sliding Distance(mm)0 500250 750 1000 1250 1500 1750 2000 2250
0.0
0.2
0.4
0.6
0.8
1.0
Enhances its wear resistance performance by adding special alloy. Enhances its durability by restraining scratch on mold surface and galling.
0.0
0.3
0.6
0.9
1.2
SKD11 TD1
SKD11(1238mm) TD1(1424mm)
Hardness Curves Impact Toughness
Har
dnes
s(H
RC)
10R -C notch Impact Value(J)0 5 10 15 20 25
Enhances its hardness with below 600°C tempering condition. - Enhances its impact toughness by reducing carbide extrusion.
0 200 400 60050
55
70
65
60
Tempering Temperature(°C)
1030°C Quenching / Air Cooling
SKD11 TD1
180°C Tempered Material
520°C Tempered Material
SKD11 TD1
Cold Work Tool Steel for High Tension Steel Plate Processing_TD1Special elements are added for high tension steel plate processing. It provides extra hardness and wear resistance through Q/T heat treatment.
Fatigue Strength Applications
Stre
ss am
plitu
de (M
Pa)
Number of Cycle to Failure
104 105 106 107 108400
600
800
1000
1200
SKD11TD1
Keeps the product durable by enhancing its fatigue strength. A test result provided by one of vehicle component manufacturers.
09SeAH Changwon Integrated Special Steel
GradeChemical composition (Wt, %)
C Si Mn P S Cr Mo V Others
SKD111.401.60 0.40 0.60 0.03 0.03
11.013.0
0.801.20
0.200.50
-
TD1(aim) 1.0 1.0 0.6 8.0 1.3 0.2 Add.
Chemical Composition
Physical Properties
Thermal expansion co-efficient(X 10-6/℃) Specific gravity (g/cm3) Heat conductivity (W/m·K) Elastic co-efficient
11.6(27~100℃)12.7(100~200℃)
7.65 26.7 220
Molds for manufacturing materials in cold state (Drawing / trimming mold for high tension steel plate).
Applications
Drawing mold Trimming mold
QT heat treatment cycle CCT Curve
Tem
pera
ture
(°C)
Tem
pera
ture
(°C)
Time(sec)Holding Time
The same heat treatment applied to SKD11 available.
150~200°C500~550°C
150~200°C500~550°C
1000~1050°CTempering(2 Times)
700~750°C
Pre Heating
Air CoolingAir CoolingSlow Heating
Air or OilCooling
1:302:004:005:00
15 min25 min55 min75 min
10 min30 min40 min
10 min25 min50 min75 min
1:302:004:005:00
Quenching
101 100 1000 100000
200
400
600
800
1000
Martensite
Bainite
-10°C/s-5°C/s
-2°C/s
-1°C/s
-0.5°C/s
-0.1°C/s-0.2°C/s
-0.3°C/s
-0.4°C/s
Tool & Mold Steel
Fric
tion
Coef
ficie
nt(ц
)
Hot Work Tool Steel_ STD61/SKD61[Equivalent to H13 (ASTM), WNR1.2344 (DIN)]
Product Characteristics
Exceptional toughness and
red hardness
Heat crack and wear resistance
Anti-heat treatment transformation
Suitable for hot die casting molds with its high Vanadium content
Suitable for Aluminum and Magnesium
Pressing Dies
Tools with extra red hardness and heat crack resistance, used for die casting and extrusion molds.
Chemical Composition
GradeChemical composition (Wt, %)
C Si Mn P S Cr Mo V
SKD610.350.42
0.801.20
0.250.50 0.03 0.02
4.805.50
1.001.50
0.801.15
Molds for manufacturing materials in a hot state.
Applications
Die-casting moldExtrusion moldExtrusion mold
TTT Curve High Temperature Material Properties
Heat Treatment Conditions
Distribution of Heat Treatment HardnessA tempering temperature is set higher (+25 to 50°C) than the operative temperature.
When the temperature of a solid solution rises, its hardness increases as well. The 2ndhardening occurs in the range from 400 to 530°C
Tempering Temperature(°C)
Har
dnes
s(H
RC)
30
40
50
60
0 100 200 300 400 500 600 700
Oil Quenching
1100°C
1000°C
1050°C
950°C
Y.S, T
.S(k
g ·f/m
m2 )
R.T 100 200 300 400 500 600 700
Temperature(°C)Time
40
80
120
160
R.A.
E.L.
Y.S.
T.S.
Tem
pera
ture
(℃)
경도
(H,C
)
1 60s 60m 60h
800
700
600
500
400
300
200
100
A + F + C
A + F + CA + C F + C
Ms20%40%
80%90%
10%
A-AusteniteF-FerriteMs-Martensite Start TemperatureC-CarbideM-Martensite
Physical Properties
Thermal expansion co-efficient (X 10-6/℃) Specific gravity (g/cm3) Heat conductivity (W/m·K) Young’s modulus (GPa)
12.5(25~200℃) 7.8 24(20℃) 205
Microstructures
Spherical cementites in ferrite matrix Tempered martensites
Spheroidizing Annealing Quenching &Tempering
Quenching and Tempering Heat Treatment Cycle
11SeAH Changwon Integrated Special Steel
Holding Time
540~630°C 540~630°C
300°C
1000~1050°C Oil Cool
Tempering(2 Times)
700~750°C
Pre Heating
Air CoolRoom Temp
Air Cool100~150°CSlow Heating
0.6hr/30mm 1hr/30mm 1hr/15mm 1hr/15mm
Quenching
Tem
pera
ture
(℃)
10㎛ 25㎛
Tool & Mold Steel
300°C
GradeChemical composition (Wt, %)
C Si Mn P S Cr Mo V Others
SKD610.350.42
0.801.20
0.250.50 0.03 0.02
4.805.50
1.001.50
0.801.15
-
DC1(aim) 0.4 0.6 0.6 5.0 1.3 0.7 Add.
Temperature Thermal expansion co-efficient (X 10-6/℃) Heat conductivity (W/m·K)
25℃ 11.5 30.7
700℃ 14.1 29.1
Hot Work Tool Steel for Die Casting_ DC1Durable tool steels with added special elements help enhance productivity. They can be applied to large molds as well.
Chemical Composition
Hot tool steels for large scale die casting with extra toughness.
Applications
Heat Treatment Conditions
The same heat treatment applied to SKD61 available. Quenching Temperature : 1030°C
Physical Properties
Time (Hr)
Crac
k Len
gth
(㎛)
Crac
k Len
gth
(㎛)
Abso
rbed
Ener
gy (J
/㎠)
1:302:004:005:00
1:302:004:005:00
1:302:004:005:00
1:302:004:005:00
1:302:004:005:00
Air or OilCooling
Air or OilCooling
Holding Time
Tem
pera
ture
(°C)
0
500
1,500
2,000
10
Max Average
20 30 40 50
DC1SKD61
0
300
600
900
50
0
100
150
1200
Temperature(°C)
UTS
(MPa
)W
eigh
t los
s ra
tio (%
)
0
500
1,000
1,500
2,000
800600400200
0.5
DC1SKD61
0
10
5
20
25
15
30
Pre Heating
Air or OilCooling 150~200°C
500~550°C150~200°C500~550°C
Tempering(2 Times)
CCT Curve
Impact ToughnessHardness Curve(HRC)
Tempering Temperature(°C)
1030℃ Quenching Condition
Har
dnes
s(H
RC)
2000 600400
65
60
55
50
45
40
35
30
Tempering Temperature(°C)
Abso
rbed
Ener
gy(J/
㎠)
Har
dnes
s(H
RC)
Absorbed EnergyHardness
540 640590
120
100
80
60
40
20
0
60
50
40
65
DC1SKD61DC1SKD61
Tem
pera
ture
(°C)
Time(sec)10.1 10010 1000 10000 100000
0
100
300
200
400
500
700
600
800
900
1000
10100(°C/sec)
Pearlite
Bainite
1
0.1
0.05 0.01
Timing chain cover mold
13SeAH Changwon Integrated Special Steel
Mechanical Properties
- Extra hardness guaranteed during heat treatment.- Excellent balance between hardness and impact toughness
High Temperature Strength- Enhances RA(Reduction of Area) rate.
Temper Softening Resistance (Exposed to a temperature of 650℃)- Enhances impact toughness and temper softening resistance through grain refinement at 650℃(die casting AI molten metal requirement).
Heat Crack PropertiesErosion Properties- Enhances anti-erosion Properties by optimizing alloying elements with Al molten metal.
- Reduces cracks through thermal stress.
Ms
Mf
Heading/cooling temp: 70 ↔ 700℃(25sec/1cycle)
Tool & Mold Steel
Quenching
1000~1050°C Oil Cool
Slow Heating
700~750°C
Al melting: ADC12 (700℃)Rotation speed: 0.33m/secDuration of evaluation : 30min
Temperature TP1 TP4 TP4M
20~100°C 7.4 11.2 11.8
20~200°C 10.9 11.8 12.3
20~300°C 12.1 12.4 12.9
20~400°C 13.0 13.0 13.4
20~500°C 13.7 13.6 14.0
20~600°C 14.3 13.8 14.2
SeAHCSS
JIS AISI DINChemical composition (Wt, %)
ApplicationsC Si Mn P S Ni Cr Mo
TP10.500.55 0.35 0.90 0.03 0.02
- - -Molds for general mer-chandise, base materials for precision parts
TP4 SCMimproved
4140improved
1.2311improved
0.260.43
0.150.35
0.801.15 0.025 0.020 0.45
0.901.50
0.200.30
Car bumper molds, radiator grills, OA equip-ment, cabinets, back covers of TVs and PCs, molds for consumer electronics and more
TP4M SNCMimproved
P20improved
1.2738improved
0.260.37
0.150.35
0.801.00 0.025 0.020 0.55
1.652.10
0.400.50
High end car bumper molds, radiator grills, OA equipment, cabinets, back covers of TVs and PCs, molds for consumer electronics and more
1.23110.350.45
0.200.40
1.301.60 0.035 0.035
-1.802.10
0.150.25
1.27380.350.45
0.200.40
1.301.60 0.035 0.035
0.901.20
1.802.10
0.150.25
1.23120.350.45
0.300.50
1.401.60 0.030
0.0500.100
-1.802.00
0.150.25
1.27140.500.60
0.100.40
0.650.95 0.030 0.030
1.501.80
1.001.20
0.450.55
Chemical Composition
Plastic Mold Steel_TP1, TP4, TP4MSteel materials used for molds that are utilized to inject molds.
Hardness Distribution
Thermal Expansion Co-efficient
Microstructures
TP1 [Nor.+Temp] TP4M [Nor.+Qu.+Double Temp.]TP4 [Nor.+Qu.+Double Temp.]
Pearlite+Ferrite Tempered Martensite Tempered Martensite
(Unit : 10-6/°C)
TP4
TP4M
350Min Max 200 100 0 100 200 350 mm36
38
40
42
44
HS(
HRC
)
38(25)42(30)
350Min Max 200 100 0 100 200 350 mm38
40
42
44
46
HS(
HRC
)
42(30)46(33)
HS(
HRC
)H
S(H
RC)
TP1
350Min Max 200 100 0 100 200 350 mm180
190
200
210
220
HB190
210△HB 15
Hardness Distribution (Deviation by Location)Guaranteed Specifications
△HS 2
△HS 2
CenterSurface Surface
Applications
Mold for car head lampsMold for car bumpers
15SeAH Changwon Integrated Special Steel
HB
50㎛ 50㎛ 50㎛
Tool & Mold Steel
CenterSurface Surface
CenterSurface Surface
GradeChemical composition (Wt, %)
C Si Mn Cr Ni Ai V Others
P210.180.22
0.200.40
0.200.40
0.200.30
3.904.25
1.051.25
0.150.25
-
SMAT1(aim) 0.1 0.3 1.5 0.8 3.0 1.0 - Add.
High Gloss Precision Plastic Mold Steel _ SMAT1High gloss precision plastic mold material with high cleanliness and uniform structure.
TV PanelTV Panel
Product Characteristics
Impact toughness Machinability High cleanlinessPolishability
Applications
- High gloss molds for mobile phone cases, consumer electronics, OA machines, automobile parts (headlamps, fog lights).- High gloss TV front panels and high precision plastics.
Cutting Force Measurement ResultThrough put Based on Cutting Speed
Cutting Velocity(m/min)
Cutt
ing
Forc
e(N
)
80
60
100
120
140300
250
200
150
100
1000 50 100 150 200 250 300 150 200 250 300
Cutting Length(m)
Cutt
ing V
eloc
ity, V
c(m
/min
) SMAT1 Control
Weldability
Welded Area
200
250
300
350
400
450
500
550
600
Distance from Surface(mm)
Har
dnes
s(H
V)
10 20 30 40
545C530Cas-welded
17SeAH Changwon Integrated Special Steel
Chemical Composition
Mechanical Properties
Grade Yield strength[N/mm2]
Tensile strength[N/mm2]
Elongation[%]
Cross-section reduc-tion[%]
Hardness[HRc]
Impact toughness[J/cm2]
SMAT1 1,000~1,200 1,100~1,300 ›14 ›45 37~41 ›45
Machinability
- Excellent end-mill Machinability
Glossiness Measurement ResultSMAT1’s Polishability
800
900
1000
1100
1200
1300
1400
SMAT1 Comparable material 1
Polishability
- No pit or wave mark formed after lapping (#1200).
- No weld line formed after lapping due to its outstanding recovering ability.
Tool & Mold Steel
SMAT1 Control
Gradeø 30 ø 18 ø 10 ø 5
RPM FeedRate Hole RPM Feed
Rate Hole RPM FeedRate Hole RPM Feed
Rate Hole
SMAT E 389 30 9 800 40 6 1,400 50 6EA 3,000 24 27
Control 389 30 0 800 40 1 1,400 50 1EA 3,000 12 1
Precision Plastic Mold Steel with Excellent Machinability_ SMAT EHigh gloss precision plastic mold materials that have excellent workability and polishability through special refining and heat treatment technics.
GradeChemical composition (Wt, %)
C Si Mn Cr Mo Others
P200.280.40
0.200.80
0.601.00
1.402.00
0.300.55
-
SMAT E 0.25 0.25 1.5 1.4 0.6 Add.
Chemical Composition
Product Characteristics
Polishability Impact toughness High cleanlinessExcellent Machinability
Mechanical Properties
Grade Yield strength[N/mm2]
Tensile strength[N/mm2]
Elongation[%]
Cross-section reduc-tion[%]
Hardness[HRc]
Impact toughness[J/cm2]
SMAT E 1,000~1,200 1,100~1,300 ›14 ›45 37~41 ›45
Cutting Volume(cm2)
Wea
r(mm
)
2000 800 1000 12 00400 600
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
16øWC16øHSS5øWC5øHSSSMAT E
Cutting Volume(cm2)
Wea
r(mm
)
2000 800 1000 12 00400 600
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
Control
(0.173)
(0.357)
19SeAH Changwon Integrated Special Steel
Applications
Molds for high polishability/gloss injection(i.e. TV panels), molds for precision injection requiring complicated shaping process,and rubber molds requiring numerous machine processing operations(electric electronic parts).
TV partsTV parts
Machinability
End Mill- Excellent in End-mill Machinability
200
400
600
800
1000
5000 1000 1500 2000
Distance(㎛)
Har
dnes
s(H
v)
200
400
600
800
1000
5000 1000 1500 2000
Distance(㎛)
Har
dnes
s(H
v)
520C, 10Hr520C, 5HrControl520C, 10Hr
520C, 5HrSMAT E
Nitriding PropertiesAs shown in the figure, ‘520°C, 5Hr’ values prove that they have an outstanding nitriding quality. Their nitriding depth is about 0.2μm and initial hardness is about 880Hv.
(0.105)
16øWC16øHSS5øWC5øHSS
ControlSMAT E
HSS ø 3 HSS ø 5 HSS ø 7 HSS ø 10 WCø 1 WCø 3 WCø 5 WCø 7 WCø 10
100
200
300
400
500
600 580
12 3 1647
75
18
174
116
510492
510
385
283
133150
90 81
Gun Drill Drilling-Excellent in gun-drill machinability.
After measuring processed holes based on the tool’s quality and size, SMATE stays at about the same or the higher level than the control material shown in the figure.
(Unit:m/min, ea)
Tool & Mold Steel
Precision Plastic Mold Steel with Excellent Machinability_ SMAT E
Applications
Application area Measurement items
Lens core mold- Injection mold (double refraction analysis and measurement)- Core damage measurement after giving shots for 2,000 times
0200 400 600 800 1000 1200 1400 1600 1800 2000
100
200
300
400
500
600
Phas
e diff
100n
m or
hig
her, m
m2
No of shots
Control Material
200th
80.39mm2
700th
68.98mm2
1,200th
57.63mm2
1,600th
361.19mm2
2,000th
433.72mm2
SMAT E
200th
30.96mm2
700th
54.72mm2
1,200th
49.86mm2
1,600th
52.49mm2
2,000th
55.86mm2
* Measurement Range:More than 110 nm. A range from red to yellow.
ControlSMATE
21SeAH Changwon Integrated Special Steel
SMAT E’s Upper Core SMAT E’s Bottom Core
ClearClear
Control Material’s Upper Core Control Material’s Bottom Core
DamagedClear
Mold Damage Observation
- SMAT E’s surface still shows satisfactory condition after giving shots for 2,000 times.
Measurement of Double Refraction after Injection
- SMATE’s double refraction rate is more constant and shows less deviation than the control material.
Tool & Mold Steel
❶
❷
❶ ❷ ❸ ❹
❸
❹
❶
❷
❸
❹
❶ ❷ ❸ ❹
Flame Hardened Tool Steel_ PST23F85
Product Characteristics
Cost can be saved throughflame surface heat treatment High strength and wear resistance at the surface
GradeChemical Composition (Wt, %)
C Si Mn Cr Mo
PST23F850.800.90
0.801.20
0.701.10
1.802.20
0.200.30
Chemical Composition
By utilizing flame, the flame hardened tool steel is produced through surface hardening heat treatment. This tool steel’s hardenability can be increased by adding Cr and Mn.The addition of Si also leads to enhance its hardenability. Furthermore, the portion of the C is a factor to control its hardness.
Molds for automobile parts, blanking dies, forming dies, trimming dies, and shear blades
Applications
Spheroidizing Annealing Microstructures
Hardness and Retained Austenite Distribution Based on the Flame Temperature
Quenching and Tempering Heat Treatment Properties
Grain Size Based on Flame Temperature Hardening Depth
Mold for car part Product
1hr/30mm
780°C
235 HB
Furnace
LateralSpherical cementites in ferrite matrix
HRC distribution ranges from 62 to 65 in the temperature of 900~950°C. Hardness lowered between 1,000~1,100°C due to increasing retained Austenite content.
Flame hardening depth: 5~6mm, HRC min: 58
0 800 900 1000 1100
60
65
70
Har
dnes
s(H
RC)
0 850 950 1050 1150
10
25
30
Reta
ined
Aus
teni
te(%
)
Austenitizing Temperature(℃)Austenitizing Temperature(℃)
Austenitizing Temperature(℃) Depth(mm)
0 800 900 1000 1100 1200
Gra
in Si
ze(A
STM
No.
)
6
7
8
9
10
11
12
2 4 6 8 10 12 14
Har
dnes
s(H
RC)
25
15
35
45
55
65
Flame depth 930°CHardening Layer
Har
dnes
s(H
RC)
0 800 900 1000 1100 1200
55
60
65
70
Austenitizing Temperature(℃)Holding Time
Har
dnes
s(H
RC)
100 200 300 400 500
70
65
60
55
50
0
Tempering Temperature(℃)
*925°C x 30min quenching (air cooled)+ temperingone hour
23SeAH Changwon Integrated Special Steel
20㎛
Tem
pera
ture
Tool & Mold Steel
GradeChemical composition (Wt, %)
C Si Mn Ni Cr Mo V
SKT40.500.60
0.100.40
0.600.90
1.501.80
0.801.20
0.350.55
0.050.15
SKT4V* 0.55 0.35 0.80 1.50 1.10 0.33 0.18
Product Characteristics
Excellent Machinability Outstanding thermal resistance
Impressive wear resistance Uniform hardness
Pre-hardened Tool Steel_ SKT4(V)Provided as in the condition of Q/T heat treated. Mold machining customer can use material as mold without additional heat treatment.
Chemical Composition
Heat Treatment Conditions for Quenching &Tempering
Tensile Strength Based on Tempering temperatures Determining Hardness at High Temperatures
Hardness Distribution(*) Upgraded version of SKT4:Higher resistance to abrasion and heat
Tools for shaping materials in a hot state.
Applications
* Dies for form forging* Extrusion dies* Press molds* Die casting dies
1hr/30mm 1hr/15mm
820°C~880°C
530°C~630°C
Oil Air
Tens
ile St
reng
th(k
gf/m
m2 )
100°C 200°C 300°C 400°C 500°C 600°C0
20
40
60
80
100
120
140
160SKT4 SKT4V SKT4 SKT4V
Har
dnes
s(H
RC)
100°C 200°C20°C 300°C 400°C 500°C 600°C0
10
20
30
40
50
60
70
SKT4
350Min Max 200 100 0 100 200 350 mm36
40
42
44
46
HRC
4042
△HRC 2
Har
dnes
s(H
RC)
Har
dnes
s(H
RC)SKT4V
350Min Max 200 100 0 100 200 350 mm36
40
42
44
46
HRC
4244
△HRC 2
TTT Curve Dimension Change
Tepe
ratu
re(°C
)
Tem
pera
ture
Leng
th C
hang
e(m
m/m
m or
in./i
n.)
Time 60S 60min 60Hour
705
595
480
370
260
150
40
4236
4852
55
19 HRC
25
Martensite Transfromation Start
Austenite
95%
Tempering Temperature(℃)Holding Time
Tempering Temperature(℃) Tempering Temperature(℃)
Tempering Temperature, °FAustenitizing Temp. 845℃
As Quenchingt 95 205 315 4250
0.0004
0.0008
0.0012
0.0016As Quenching 200 400 600 800
25SeAH Changwon Integrated Special Steel
Hot Pressing DiesHot Pressing Dies
Tool & Mold Steel
Austenitizing Temp., 845°C50%
GradeChemical composition (Wt, %)
C Si Mn Ni Cr Mo V
PSTR-12 1.50 0.50 0.50 0.20 12.0 1.00 0.80
PSTR-2 0.50 1.10 0.40 0.20 5.00 1.30 0.60
PSTR3505C 0.90 0.65 0.35 - 3.20 0.20 -
PSTR-5 0.90 0.30 0.45 Add 5.00 0.45 Add
Chemical Composition
Forged RollsWork rolls used for cold rolling mills that press steel plates applied to automobiles and electronic products.
•PSTR-12(SKD11 Modify) : Z/Mill Work Roll•PSTR-2(SKD62 Modify) : Z/Mill 1st / 2nd Roll
•PSTR3505C : 3% Cr Steel(General)•PSTR-5 : 5% Cr Steel(Electrical Plate Mill WR, Cold Rolled Mill WR/IMR)
*WR : Work Roll, IMR : Intermediate Roll
Applications
Applications
Work Roll
Depth Hardness Distribution
Diameter(mm)
Har
dnes
s(H
S)
70
75
80
85
90
95
100
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75
HSD 91
Up to 65mm of the outer diameter guaranteed
* Hardness of work rolls for cold rolling steel plates applied to automobiles: HSD 96±1(HSD 91Up)
POSCO
Pohang
No.1 CR Shop 5% Cr Steel (ESR) W/R
No.2 CR Shop 5% Cr Steel (ESR) W/R
Electrical Plate Shop 5% Cr Steel (ESR) W/R, Z/Mil
STS CR Shop Z/Mill
Gwangyang
No.1 CR Shop 5% Cr Steel (ESR) W/R
No.2 CR Shop 5% Cr Steel (ESR) W/R
No.3 CR Shop 5% Cr Steel (ESR) W/R
No.4 CR Shop 5% Cr Steel (ESR) W/R
India CR Shop 5% Cr Steel (ESR) W/R
DHF Japan CR Shop 3% Cr Intermediate Roll
HYUNDAI HYSCO CR Shop 5% Cr Steel (ESR) W/R
BNG STEEL STS CR Shop Z/Mill
SeAH STEEL CR Shop 3% Cr Intermediate Roll
27SeAH Changwon Integrated Special SteelTool & Mold Steel
Specifiactions
Type Standard GradeChemical composition (Wt, %) Annealing
temp.(°C)Annealing hardness
Heat treatment temp. (°C)Hardness Applications
C Si Mn P S Ni Cr Mo V Others Quenching Tempering
KS STC3(STC105) 1.001.10
0.100.35
0.100.50 0.03 0.03
750~780 Furnace cooling HB 212 Max 780
Water Cooling180
Air cooling HRC Min 61
Press frames, clamping tools chisels, drills, hammersJIS SK3(SK105) 1.00
1.100.100.35
0.100.50 0.03 0.03
750~780 Furnace cooling HB 212 Max 780
Water Cooling180
Air cooling HRC Min 61
ASTM W1 0.951.05
0.100.40
0.100.40 0.03 0.03 0.20 0.15 0.10 0.10
Cu : Max 0.20W : Max 0.15
730~760 Furnace cooling HB 202 Max 760~820
Water Cooling150~200
Air cooling HRC Min 61
KS STD11 1.401.60 0.40 0.60 0.03 0.03 0.50
11.0013.00
0.801.20
0.200.50
830~880 Furnace cooling HB 255 Max 1030
Air cooling180
Air cooling HRC Min 58
Cold dies, presses, tools, press dies
JIS SKD11 1.401.60 0.40 0.60 0.03 0.03
11.0013.00
0.801.20
0.200.50
830~880 Furnace cooling HB 255 Max 1030
Air cooling180
Air cooling HRC Min 58
ASTM
D2 1.401.60
0.100.60
0.100.60 0.03 0.03 0.40
11.0013.00
0.701.20
0.501.10
830~880 Furnace cooling HB 255 Max 1010
Air cooling204
Air cooling HRC Min 59
D3 2.002.35
0.100.60
0.100.60 0.03 0.03 0.50
11.0013.50 1.00 W : Max1.0
830~880 Furnace cooling HB 255 Max 968
Oil cooling204
Air cooling HRC Min 61
D4 2.052.40
0.100.60 0.60 0.03 0.03
11.0013.00
0.701.20
0.151.00
830~880 Furnace cooling HB 255 Max 996
Air cooling204
Air cooling HRC Min 62
DINWNR1. 2379 1.50
1.600.100.40
0.150.45 0.03 0.03
11.0012.00
0.600.80
0.901.10
830~880 Furnace cooling HB 255 Max 1010
Air cooling204
Air cooling HRC Min 58
WNR1. 2080 1.902.20
0.100.40
0.150.45 0.03 0.03
11.0012.00
830~880 Furnace cooling HB 248 Max 996
Air cooling204
Air cooling HRC Min 60
SeAH CSS TD1 Patent 180~520 Air cooling HB 255 Max 1030
Air cooling180/520
Air cooling HRC Min 58
KS
STF4 0.500.60
0.100.40
0.600.90 0.03 0.02
1.501.80
0.801.20
0.350.55
0.050.15
740~800 Furnace cooling HB 248 Max 850
Oil cooling500
Air cooling HRC Min 42
Extrusion dies,
Die casting dies, forging dies, head dies, shearing knives
STD61 0.350.42
0.801.20
0.250.50 0.03 0.02 0.25
4.805.50
1.001.50
0.801.15
820~870 Furnace cooling HB 229 Max 1020
Air cooling550
Air cooling HRC Max 50
STD62 0.320.40
0.801.20
0.200.50 0.03 0.02
4.755.50
1.001.60
0.200.50 W : 1.0~1.6 820~870
Furnace cooling HB 229 Max 1020 Air cooling
550 Air cooling HRC Max 48
STD6 0.320.42
0.801.20
0.200.50 0.03 0.02
4.505.50
1.001.50
0.300.50
820~870 Furnace cooling HB 229 Max 1050
Air cooling550
Air cooling HRC Max 48
JIS
SKT4 0.500.60
0.100.40
0.600.90 0.03 0.02
1.501.80
0.801.20
0.350.55
0.050.15
740~800 Furnace cooling HB 248 Max 850
Oil cooling500
Air cooling HRC Min 42
SKD61 0.350.42
0.801.20
0.250.50 0.03 0.02
4.805.50
1.001.50
0.801.15 W : 1.0~1.5 820~870
Furnace cooling HB 229 Max 1020 Air cooling
550 Air cooling HRC Min 50
SKD62 0.320.40
0.801,00
0.200.50 0.03 0.03
4.755.50
1.001.50
0.200.60 W : 1.0~1.5 820~870
Furnace cooling HB 229 Max 1020 Air cooling
550 Air cooling HRC Min 48
SKD6 0.330.43
0.801.25
0.200.60 0.03 0.03
4.755.50
1.101.60
0.300.60
820~870 Furnace cooling HB 229 Max 1050
Air cooling550
Air cooling HRC Min 48
ASTM
H13 0.320.45
0.801.25
0.200.60 0.03 0.03
4.755.50
1.101.75
0.801.20
820~870 Furnace cooling HB 235 Max 1010
Air cooling552
Air cooling HRC Min 52
H12 0.320.40
0.801.00
0.200.50 0.03 0.03
4.755.50
1.001.50 W : 1.0~1.5 820~870
Furnace cooling HB 235 Max 1010 Air cooling
552 Air cooling HRC Min 53
H11 0.330.43
0.801.25
0.200.60 0.03 0.03
4.755.50
1.101.60
0.300.60
820~870 Furnace cooling HB 235 Max 1010
Air cooling552
Air cooling HRC Min 53
DIN
WNR1. 2344 0.370.43
0.901.20
0.300.50 0.03 0.03
4.805.50
1.201.50
0.90 1.10
750~780 Furnace cooling HB 229 Max 1010~1030
Oil cooling540~560
Air cooling HRC Min 50
WNR1. 2343 0.360.42
0.901.20
0.300.50 0.03 0.03
48.05.50
1.101.40
0.250.50
750~780 Furnace cooling HB 229 Max 1010~1030
Oil cooling540~560
Air cooling HRC Min 48
WNR1.2767 0.400.50
0.100.40
0.150.45 0.03 0.03
3.804.30
1.201.50
0.150.35
610~650 Furnace cooling HB 285 Max 840~860
Oil cooling170~190
Air cooling HRC Min 52
SeAH CSS
SKT4V 0.500.60 0.35
0.701.00 0.025 0.02
1.302.00
1.001.40
0.250.50
0.100.30
Al : 0.02~0.03Nb : 0.03~0.04
760~780 Furnace cooling HB 241 Max 850
Oil cooling550
Air cooling HRC Min 40
PST27K57V 0.550.60
1.001.20 0.50 0.03 0.03
0.801.20
4.505.50
1.401.60
0.801.20 Cu : Max 0.25 860~870
Furnace cooling HB 241 Max 1010 Oil cooling
550 Air cooling HRC Min 55
DC1 Patent 820~870 Furnace cooling HB 229 Max 1020
Air cooling550
Air cooling HRC Min 50
SeAH CSS
TP1 0.500.55 0.35 0.90 0.03 0.02
Prehardened steel
540~590 Air cooling HB Max 215
Molds for general merchan-dise, base materials for preci-sion parts
TP4 0.260.43
0.150.35
0.801.15 0.025 0.02 0.45
0.901.50
0.200.30
0.020.04 special Alloy
added
850~890 Oil cooling
540~620 Air cooling HS Min 38 Molds for auto bumpers,
OA machines, TV & PC back coversTP4M 0.26
0.370.150.35
0.801.00 0.025 0.02
0.300.55
1.652.10
0.400.50
850~890 Oil cooling
540~620 Air cooling HS Min 40
SMAT1 Patent
SMAT E Patent
29SeAH Changwon Integrated Special Steel
Carbon Tool steel
Cold work Tool
steel
Hot work Tool steel
Plastic Mold steel
Tool & Mold Steel
Specifiactions
Type Standard GradeChemical composition (Wt, %) Annealing
temp.(°C)Annealing hardness
Heat treatment temp. (°C)Hardness Applications
C Si Mn P S Ni Cr Mo V Others Quenching Tempering
DIN
WNR1.2311 0.350.45
0.200.40
1.301.60 0.04 0.04
1.802.10
0.150.25
850~890 Air cooling HB 230 Max 850~890
Oil cooling540~620
Air cooling HS Min 38
Molds for high end auto bum-pers and consumer electronics
WNR1.2312 0.350.45
0.300.50
1.401.60 0.03
0.050.10
1.802.00
0.150.25
850~890 Air cooling HB 230 Max 850~890
Oil cooling540~620
Air cooling HS Min 38
WNR1.2714 0.500.60
0.100.40
0.650.90 0.03 0.03
1.501.80
1.001.20
0.450.55
0.070.12
850~890 Air cooling HB 245 Max 850~890
Oil cooling540~620
Air cooling HS Min 38
WNR1.2738 0.350.45
0.200.40
1.301.60 0.04 0.04
0.901.20
1.802.10
0.150.25
850~890 Air cooling HB 240 Max 850~890
Oil cooling540~620
Air cooling HS Min 42
ASTM
A2 0.951.05
0.100.50
0.401.00 0.03 0.03
4.755.50
0.901.40
0.150.50
830~880 Furnace cooling HB 255 Max 954
Air cooling204
Air cooling HRC Min 60
Forming dies, punchesA6 0.650.75
0.100.70
1.802.50 0.03 0.03
0.901.40
0.901.40
0.150.50
770~790 Furnace cooling HB 248 Max 843
Air cooling204
Air cooling HRC Min 58
A8 0.500.60
0.751.10
0.200.50 0.03 0.3
4.755.50
1.151.65 W : 1.0~1.5 770~790
Furnace cooling HB 241 Max 1010 Air cooling
510 Air cooling HRC Min 56
DIN WNR1.2363 0.901.05
0.200.40
0.400.70 0.035 0.035
4.805.50
0.901.20
0.100.30
770~790 Furnace cooling HB 230 Max 950
Air cooling180
Air cooling HRC Min 60 Forming dies, punches
KS
STS95 0.800.90 0.50
0.801.10 0.03 0.03
0.200.60
730~760 Furnace cooling HB 212 Max 820
Oil cooling180
Air cooling HRC Min 59 Ring gauges, pulling dies
STS3 0.901.00 0.35
0.901.20 0.03 0.03
0.501.00 W : 0.5~1.0 750~800
Furnace cooling HB 217 Max 830 Oil cooling
180 Air cooling HRC Min 60 Screw cutters, cutting knives
STS93 1.001.10 0.50
0.801.10 0.03 0.03
0.200.60
750~780 Furnace cooling HB 217 Max 820
Oil cooling180
Air cooling HRC Min 63 Blades, press frames
JIS
SKS95 0.800.90 0.50
0.801.10 0.03 0.03
0.200.60
730~760 Furnace cooling HB 212 Max 820
Oil cooling180
Air cooling HRC Min 59 Ring gauges, pulling dies
SKS3 0.901.00 0.35
0.901.20 0.03 0.03
0.501.00 W : 0.5~1.0 750~800
Furnace cooling HB 217 Max 830 Oil cooling
180 Air cooling HRC Min 60 Screw cutters, cutting knives
SKS93 1.001.10 0.50
0.801.10 0.03 0.03
0.200.60
750~780 Furnace cooling HB 217 Max 820
Oil cooling180
Air cooling HRC Min 63 Blades, press frames
ASTM
O1 0.851.00
0.100.50
1.001.40 0.03 0.03
0.400.70 0.30 W : 0.4~0.6 750~800
Furnace cooling HB 212 Max 802 Oil cooling
204 Air cooling HRC Min 59 Cold molding dies, forming rolls
O6 1.251.55
0.551.50
0.301.10 0.03 0.03 0.30
0.200.30
730~760 Furnace cooling HB 212 Max 802
Oil cooling204
Air cooling HRC Min 59 Ring gauges, pulling dies
O2 0.850.95 0.50
1.401.80 0.03 0.03 0.50 0.30 0.30
750~770 Furnace cooling HB 217 Max 802
Oil cooling204
Air cooling HRC Min 59 Cold molding dies, forming rolls
DINWNR1.2510 0.90
1.050.150.35
1.001.20 0.035 0.035
0.500.70
0.050.15 W : 0.5~0.7 770~790
Furnace cooling HB 229 Max 780~820 Oil cooling
180~220 Air cooling HRC Min 61
Cold molding dies, forming rollsWNR1.2842 0.85
0.950.100.40
1.902.10 0.03 0.03
0.200.50
0.050.15
750~770 Furnace cooling HB 229 Max 790~820
Oil cooling150~250
Air cooling HRC Min 60
KS STS41 0.350.45 0.35 0.50 0.03 0.03
1.001.50 W : 2.5~3.5 760~820
Furnace cooling HB 217 Max 880 Oil cooling
180 Air cooling HRC Min 53 Dies for hot forging
JIS SKS41 0.350.45 0.35 0.50 0.03 0.03
1.001.50 W : 2.5~3.5 760~820
Furnace cooling HB 217 Max 880 Oil cooling
180 Air cooling HRC Min 53 Dies for hot forging
ASTM
S1 0.400.55
0.151.20
0.100.40 0.03 0.03
1.001.80 0.50
0.150.30 W : 1.5~3.0 760~820
Furnace cooling HB 217 Max 954 Oil cooling
204 Air cooling HRC Min 56 Dies for hot forging
S5 0.500.65
1.752.25
0.601.00 0.03 0.03
0.100.50
0.201.35
0.150.35
830~850 Furnace cooling HB 229 Max 899
Oil cooling204
Air cooling HRC Min 58Cutter blades, punches
S7 0.450.55
0.201.00
0.200.90 0.03 0.03
3.003.50
1.301.80 0.35
830~850 Furnace cooling HB 229 Max 954
Air cooling204
Air cooling HRC Min 56
SeAH CSS
PSTR-1 1.301.70 0.70 0.70 0.03 0.03 0.50
11.0013.00
0.701.30
0.501.00 Co : 0.2~0.5 860~880
Furnace cooling HB 225 Max
Heat treatment at low, medium or high frequency
* As per customer’s requirements
HS Min 90
Z-mills and cold rollers
PST23R11 1.401.55 0.40 0.60 0.03 0.03 0.50
11.0012.50
1.551.70
0.700.95 Co : 0.3~0.5 860~880
Furnace cooling HB 225 Max HS Min 90
PSTR-2 0.300.60 1.30 0.70 0.03 0.03 0.50
4.006.00
0.801.70 0.82 W : Max 1.5 860~880
Furnace cooling HB 229 Max HS Min 90
PSTR-5 0.750.95
0.200.50
0.200.50 0.025 0.015 0.50
4.505.50
0.400.65 - - 860~880
Furnace cooling HB 229 Max HS Min 90
PSTR-12 1.301.70 0.70 0.70 0.03 0.03 0.50
11.0013.00
0.701.30
0.501.00
Co : 0.2~0.5Cu : Max 0.30
860~880 Furnace cooling HB 245 Max HS Min 90
SeAH CSS PST23F85 0.800.90
0.801.20
0.701.10 0.025 0.025
1.802.20
0.200.30
0.050.10
810~830 Furnace cooling HB 235 Max 900~1000°C
Flame HRC Min 60 Cold moldsFlame hardened Tool steel
31SeAH Changwon Integrated Special Steel
Oil hard-ened Tool
Steel
Shock resisting Tool steel
Forged Rolls
Plastic
Mold
Steel
Air
hardened
Tool Steel
Tool & Mold Steel
SK3
Wearresistance
SK1
Wear resistanceSKD1
Cold work tool steelSKD11
Wear resistanceHigh temp. hardeness
SKH3
High speed tool steelSKH55
SK2
Machinability SKS2 Cold work tool steel
MachinabilityHigh temp. hardeness
SKH2
High speed tool steelSKH51
Impact resistance SK5
Wear resistanceImpact resistance
SKS3
Cutting tool steel with Impact resistanceSKS31
Impact resistance SKS41
High temp. hardeness SKD4
Hot work tool steelImpact resistance SKD61
Product Size
Requirement Substantial Alloy Elements
High temperature strength W, Mo, Co (in combination with W or Mo), V, Cr, Mn
Wear resistance V, W, Mo, Cr, Mn
Hardenability Mn, Mo, Cr, Si, Ni, V
Transformation resistance Mo (in combination with Cr), Cr, Mn
Toughness (grain refinement) V, W, Mo, Mn, Cr (Al adjusted for others)
Resistance to oxidation for hot work tool steel Cr, Si, Al
200≤W≤300
300<W≤350
350<W≤405
405<W≤450
450<W≤505
505<W≤600
600<W≤650
650<W≤850
850<W≤950
950<W≤1000
1000<W≤1100
1100<W≤1250
150<T≤200
200<T≤250
250<T≤305
305<T≤350
350<T≤400
400<T≤500
500<T≤550
550<T≤600
600<T≤650
650<T≤700
Forged Flat Bars(Unit : mm)
150≤W≤170 170<W≤220 220<W≤250 250<W≤310 310<W≤410 410<W≤510 510<W≤610 610<W≤1010
10≤T≤13
13<T≤16
16<T≤22
22<T≤50
50<T≤65
65≤T<110
110<T≤120
120<T≤130
130<T≤150
Rolled Flat Bars(Unit : mm)
500≤W<600
600.1≤W<800
800≤W<1000
1000≤W<1100
1100≤W<1200
1200≤W<1300
1300≤W<1400
1400≤W<1600
1600≤W<1700
1700≤W≤1900
200≤T≤300
300<T≤500
500<T≤600
600<T≤800
800<T≤1000
1000<T<1100
1100<T≤1100
Plastic Mold Steel (Forged Flat Bars)(Unit : mm)
Contact us for any order outside the dimensions above. [T: Thickness, W: Width]
Round Bars• Rolled (5.7~340ø) • Forged (206~850ø)
Classification of Tool Steel33SeAH Changwon Integrated Special SteelTool & Mold Steel
Packing TypesFlat bars
Bare Hessian Wooden Slate
Bare Hessian Wooden Slate
Wooden Box
Round bars
Order RequirementsWe can only provide the right product for you when you fully specify what you need. Be sure to provide detailed information for the line items below.E-mail : [email protected] / Website : www.seahss.co.kr/eng / Tel : +82 2 6970 2369 for questions
1) Applicable standards: ASTM, JIS, DIN, etc. 2) Steel grade, Surface, Heat Treatment, Dimension
3) Quantity and Delivery 4) Applications, method of processing 5) Special requirements (if applicable)
Certificates of Approval
ISO/TS 16949:2009ISO QUALITY MANAGEMENT SYSTEM
KOSHA18001KOSHA SAFE AND HEALTH MANAGEMENT SYSTEM
ISO 9001:2008ISO QUAL-ITY MANAGE-MENT SYSTEM
ISO 14001:2004ENVIRON-MENTAL MANAGEMENT SYSTEM
KOREAELECTRICPOWERINDUSTRYCODE
JAPANESEINDUSTRIALSTANDARDS
KOREANINDUSTRIALSTANDARDS
Tag & Label
Tag (for Domestics) Tag (for Export) Label (for Domestics) Label (for Export)
35SeAH Changwon Integrated Special SteelTool & Mold Steel