Doosan Heavy Industries & Construction TOOL STEEL FOR DIE CASTING … · 2017-03-17 · DOOSAN HEAVY INDUSTRIES & CONSTRUCTION TOOL STEEL FOR DIE CASTING & HOT STAMPING DTX1 The ever-faster

TOOL STEEL FOR DIE CASTING & HOT STAMPING

DTX1

Doosan Heavy Industries & Construction

DOOSAN HEAVY INDUSTRIES & CONSTRUCTION

TOOL STEEL FOR DIE CASTING & HOT STAMPING DTX1

The ever-faster pace of change necessitates products of ever-higher precision. Doosan has the latest technologies and sufficient experience to produce the advanced tool steel satisfying this need. Moreover, the steady enhancement of the industrial productivity will always bring the satisfaction.

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TOOL STEEL FOR DIE CASTING & HOT STAMPING DTX1 CONTENTSCharacteristics | 특징

Mechanical properties | 기계적 특성

Thermal properties | 열적 특성

Melt-out property | 용손 반응 특성

Machinability | 기계 가공성

Applications | 적용 사례

04

06

08

09

10

11

DOOSAN TOOL STEELS


1. Higher resistance to catastrophic crack propagation due to excellent toughness 인성이 우수하여 금형의 대형균열 발생 억제

2. Easiness for manufacturing the complex molds due to higher machinability STD 61 대비 기계가공성이 우수하여 금형 제작 용이

3. Good resistance to heat crack with higher thermal conductivity 우수한 열전도율로 내 heat crack 성 우수

4. Extended mold life due to higher resistance to softening 연화 저항성이 우수하여 금형 수명 증대

Toughness인성

High Temp. Strength고온강도

Heat crack resistance내 heat crack 성

Machinability기계가공성

DTX1 ◎ ◯ ◯ ◎

STD61 △ △ △ ◯

Excellent ◎ > ◯ > △ poor

Comparison of Properties | 특성 비교

(Unit: wt.%)

C Mn Cr Mo Si V Others

DTX1 0.35~0.45 ＜0.50 4.5~5.5 1.0~1.5 adjusted

Chemical Compositions | 화학성분

CHARACTERISTICS | 특징

DOOSAN TOOL STEELS

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Annealing 1) Quenching Tempering

800~900 °C 1000~1050 °C 550~650 °C

1) Max. hardness(HB) of as annealed material : 229

Heat treatment | 열처리

Time

Tem

pera

ture

(°C)

1200

1000

800

600

400

200

0

1000~1050°C

550~650°C

80~100°C

550~650°C

2nd Preheat(700~800°C)

1st Preheat(500~600°C)

Austenitizing

1st Tempering 2nd Tempering

High Pressuregas cooling

Air cooling Air cooling

STD 61 DTX1

As annealed

Quenching, Tempered

40㎛

40㎛

40㎛

40㎛

Continuous cooling transformation curves | 연속 냉각 변태

Time (sec.)

Tem

pera

ture

(°C)

Quenching Temperature : 1030°C

1000

900

800

700

600

500

400

300

200

100

00.1 1 10 100 1000 10000 100000

100(°C/sec)

Cooling speed

10 0.5

0.2 0.1

0.05 0.02 0.015 1

Pearlite

Bs

Ms

Mf

Bf

■ Heat treatment cycle | 열처리 조건 ■ Micro-structure | 미세 조직


Tensile properties vs. Hardness | 인장특성 vs 경도

Tensile properties vs. Test temperature | 고온인장 특성

Hardness (HRc)

Stre

ngth

(MPa

) Elongation (%)

2200

2000

1800

1600

1400

1200

30

25

20

15

10

5

0

44 46 48 50 52 54 56 58

TSYSEL

Temperature(°C)

Stre

ngth

(MPa

) 1600

1400

1200

1000

800

600

400

200

00 100 200 300 400 500 600 700

TSYS

Hardness st 25°C : 47HRc

Temperature(°C)

EL &

RA

(%)

100

80

60

40

20

00 100 200 300 400 500 600 700

ELRA

Resistance to softening at elevated temp. (650℃) | 고온 연화 저항성

Exposure time at 650°C (hr)

45

40

35

30

25

20

0 10 20 30 40 50

Har

dnes

s (H

Rc)

DTX1STD61


1100

1000

900

800

700

600

500

0 10 20 30 40 50

Com

pres

sive

Str

engt

h (M

Pa)

Compression up to 50%(0.1s-1)


140

120

100

80

60

40

200 10 20 30 40 50

Absr

obed

ene

rgy

(J/cm

2)

2mm U-notch Charpy impact testLongitudinal direction

Quenched & tempered hardness | 소입 & 소려 경도

Tempering temperature(°C)

Har

dnes

s (H

Rc) 60

50

40

30

200 100 200 300 400 500 600 700

Quenching Temp.

1030°C1000°C

950°C

MECHANICAL PROPERTIES | 기계적 특성

DOOSAN TOOL STEELS

07

Fatigue property at room temperature | 피로 특성

■ Low cycle fatigue | 저주기 피로

■ Absorbed energy vs. Temp. | 충격 흡수 에너지 vs. 온도

■ High cycle fatigue | 고주기 피로

■ Impact toughness isotropy | 충격 인성 등방 성 비교

Number of cycles to fracture

Tota

l str

ain

rang

e (%

)

DTX1STD61

1.3

1.2

1.1

1.0

0.9

0.8

0.7103 104 105

Number of cycles to Failure

Appl

ied

Stre

ss (M

Pa)

DTX1STD611000

900

800

700

104 105 108106 107

Charpy impact test | 2U mm notch, 충격 특성

1) Normalizing the absorbed energy of STD61(Longitudinal direction) as to 1

2mm U-notch Charpy impact test(Longitudinal direction)

Test temperature(°C)

Inde

x of

Cha

rpy

impa

ct v

alue

1) 8

7

6

5

4

3

2

1

00 50 100 150 200 250 300

DTX1STD61

Hardness : 45HRc

2mm U-notch Charpy impact test at room temp.

Inde

x of

Cha

rpy

impa

ct v

alue

1)

DTX1 STD61

1.6

1.2

0.8

0.4

0.0

L

L

T

T

L : Longitudinal directionT : Transverse direction

Thermal expansion coefficient 열팽창계수 (x10-6/˚C)

Thermal conductivity열전도 (W/mK) Young's modulus

영율 (GPa)200˚C 400˚C 600˚C 25˚C 200˚C 400˚C 600˚C

DTX1 12.8 13.5 14.2 29.5 31.7 31.9 31.6 216

STD61 11.6 12.5 13.2 24.0 26.5 28.2 28.9 200

Physical properties | 기본 물성

Heat crack property | 열피로 특성


Material소재

Heat crack test 열 피로 시험

Sectional crack shapes after test cycle

열 피로 시험 후 단면 관찰

Maximum crack length최대 균열 깊이

Test condition시험조건

DTX1 66 μm

High frequency (1000 cycles) heating up to 650℃ and cooling.

고주기 열 피로 시험

: 650℃까지 가열 후 냉각,

1000회 반복STD61 100 μm

Sample : 50x50x30, mm1 cycle

35sec14sec

THERMAL PROPERTIES | 열적 특성

Heating Coil

High frequency heating machine

Quenching Machine

Nozzle spraying water

SpecimenSpecimen

Heating Temp. : 600-700℃

Water coolingHeating

100㎛

100㎛

DOOSAN TOOL STEELS

09

MELT-OUT PROPERTY | 용손 반응 특성

Immersion test | 침지 실험

Material소재

Immersion test 침지 시험

Melt-out reaction layer observation 용손 반응 층 관찰

Mean melt-out depth평균 용손 깊이

Test condition시험조건

DTX1 280 μm

Measured with intervals of

1mm distance In molten Al

alloy at 700oC for up to 43hrs

700℃에서 용융 Al 합금에서

43시간 동안 침지 후 1mm

간격으로 측정STD61 400 μm

Graphite Crucible

Specimen

Heater

Thermocouple (k-type)

700±2℃

1 mm distanceThe data taken 10 times

specimen

Sealed by refractory material (super-3000)

4 mm

800㎛

800㎛


Machinability test

MACHINABILITY | 기계 가공성

Material소재

Wear loss마모량

Chip칩

Machining condition가공조건

DTX1 0.2 mm

Rough Machining with CNT- MCT using

Ø63F (R3.0), 4 edge DIJET

DIJET 공구를 사용하여 CNT-MCT 장비로 황삭 가공

Machining time : 6hrs (6시간 동안 가공)

STD61 0.5 mm

■ Product shape for the machining testTool steel (480X290X320 mm3)

⇣

Mold Product

DOOSAN TOOL STEELS

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Applications for die casting | 다이캐스팅 금형 적용 사례

Applications for hot stamping | 열간 프레스 성형 금형 적용 사례

Mold As assembledProduct

■ Timing chain cover | 타이밍 체인 카바

■ Center piller for car body | 차체용 센타필러

■ Auto transmission housing | 자동 변속기 부품

APPLICATIONS | 적용 사례

Mold As assembledProduct

Doosan Heavy Industries & Construction창원본사 (HEAD OFFICE AND CHANGWON PLANT)

우편번호 642-792 경상남도 창원시 성산구 두산볼보로 22

Mail Code 642-792 22 DoosanVolvo-ro,Seongsan-Gu, Changwon, Gyeongnam KoreaTel. 82-55-278-6114, 7114 Fax. 82-55-264-5551~2

www.doosanheavy.com서울사무소 (SEOUL OFFICE)

우편번호 137-920 서울시 서초구 강남대로 465

Mail Code 137-920 465 Gangnam-daero,Seocho-Gu, Seoul KoreaTel. 82-2-513-6114 Fax. 82-2-513-6200

Documents

Doosan Heavy Industries & Construction TOOL STEEL FOR DIE CASTING … · 2017-03-17 · DOOSAN HEAVY INDUSTRIES & CONSTRUCTION TOOL STEEL FOR DIE CASTING & HOT STAMPING DTX1 The ever-faster