JFE New Product Ni & Mo free

high corrosion resistant ferritic stainless steel

ＪＦＥ４４３ＣＴ

JFE Steel Corporation

Features of ＪＦＥ４４３ＣＴ

1. High corrosion resistanceCr content increased to 21%, Ultra low C and N , Add Ti,

SUS304 equivalent corrosion resistance.

2. Cost competitiveness and Price stability(1) No Nickel

lower cost than SUS304 (Cr-Ni type). (2) No Nickel and Molybdenum

Not influenced by LME fluctuation price.

1

Chemical Composition

（mass％）

ＪＦＥ４４３ＣＴ

SUS436L

SUS 304

Cr Ni Mo Ti21.0 - 0.3-

17.7 - 0.31.2

18.2 8.2 --

Steel Type

（JFE 436LT)

ＪＦＥ４４３ＣＴ has Cr 21% content.

2

Mechanical Properties

(Sheet thickness : 0.8mm)Proof stress

Tensile strength

Elongation

(N/mm2)

ＪＦＥ４４３ＣＴ 305 483 31

r-value

1.3

(JFE 436LT) 285 495 30 1.4

SUS 304 260 645 60 1.0

(N/mm2)Steel

Hard-ness

161

159

185

ConicalCup Value (mm)

38.6

38.3

37.7

(%) (Hv)

SUS436L

Typical Value

Mechanical Properties of ＪＦＥ４４３ＣＴ are equivalent to those of 436L.

3

Physical Properties

Density Electric Resistance Magnet

-ism(g/cm3)

ＪＦＥ４４３ＣＴ 7.74 62 444

Thermal ExpansionCoefficient20～100℃(10-6/℃)

10.5

SUS436L(JFE 436LT) 7.73 48 433 10.4

SUS 304 7.93 72 502 17.3

(10-6Ω・cm)

Magnetic

Non-Magnetic

Magnetic

Specific Heat25℃(J/kg・℃)

Thermal Conductivity100℃

(W/m・℃)

22.5

23.6

16.2

Young’sModulus（GPa）

204

212

193

Physical Properties of ＪＦＥ４４３ＣＴ are similar to those of 436L.

4

Results of Pitting Potential measurement (JIS G 0577: 3.5%NaCl, 30℃)

● ●

●●

●

●

●

●

●●

●●

SUS304

SUS410

SUS316

SUS430

JFE445MT

JFE434LN-2(SUS444)

ＪＦＥ４４３ＣＴJFE436LTJFE430CuN

(SUS430J1L)JFE432LTM

JFE439LJFE430XT

SUH409L 302010Pitting Index（Cr+3.3Mo)

Pitt

ing

Pote

ntia

lV’C

10ｍ

V v

s S.C

.E800

600

400

200

●

The higher in this chart, the higher anti-corrosion

Corrosion resistance Table

5

Results of pitting potential measurement (JIS G 0577: 3.5%NaCl, 30°C)

Corrosion resistance (1)

Pitti

ng p

oten

tial (

mV

vs.

SCE)

higher

lower

400

SUH409L SUS436L

300

200

100

0SUS430 SUS

430J1LSUS430LX

Cr (wt%)Ni (wt%)Mo (wt%)Others

11 16 18 19 18 18 21- - - - 8- -- - - - 1.2 -

Ti -

-Ti Nb, Cu Ti Cu, Ti-

Pitting potential of JFE443CTis equal to that of SUS304.

JFE Grade JFE409L SUS430JFE430XTJFE439LJFE430LN

JFE430CuN JFE436LT

JIS

ＪＦＥ４４３ＣＴ

SUS304

Corrosion resistance

6

Corrosion resistance (2)

Result of a cyclic corrosion test （JASO－CCT）SUS304SUS436L

(JFE 436LT)ＪＦＥ４４３ＣＴSUS430 Type439

( After 30cycles ,240 hours)Sample：#600-polished surface

＜Test Conditions＞1 Cycle ： Salt Spray (5%NaCl，35℃，2hr) → Dry (60℃，4hr) →Wet (40℃，2hr）

ＪＦＥ４４３ＣＴ shows the similar corrosion resistance to 304 and 436L.7

Corrosion resistance (3)

Result of a field exposure test

SUS304SUS436L(JFE 436LT)

ＪＦＥ４４３ＣＴSUS430 Type439

( After 9 months )

Sample： #600-polished surface

Coastal area : Chiba Japan

8

Corrosion resistance (4)

Result of a salt spray test （SST）

SUS304SUS436L(JFE 436LT)

ＪＦＥ４４３ＣＴSUS430 Type439

( After 3000h )

Sample：#600-polished surface5%NaCl，35℃

9

Result of a CCT for weld metal of TIG

As welded

SUS304JFE436LT(SUS436L) ＪＦＥ４４３ＣＴSUS430

(CCT 30cycles）

Polishedafter welding

Corrosion resistance (5)

The weld metal of JYH21CT exhibits as good corrosion resistance as SUS304. 10

Stress Corrosion Cracking

42%MgCl2 U-bend：JIS G 0576

SUS304 ＪＦＥ４４３ＣＴ

5mm

Cracking Cracking at ≦15h No Cracking at 100 Hr

Sample Surface

42%MgCl2 Boiling (143℃)

SUS304 Stress Corrosion Cracking (SCC)happened in less than 15 hours. ＪＦＥ４４３ＣＴ has no SCC at 100 hours.

11

Thickness of specimen: 0.8mmLubrication: graphite greasePunch diameter: 20mm

Result of Erichsen test

specimen

die

punch

crack

blankholderＪＦＥ４４３ＣＴSUS 304

12.1mm 9.0mm

12

(stretch formability test)

Result of deep drawing formability test

[ Measurement of limiting drawing ratio (LDR)]

ＪＦＥ４４３ＣＴSUS 304

LDR=2.21 LDR=2.36

punch

specimen

Thickness of specimen: 0.8mmLubrication: punch side none

die side vinyl filmPunch diameter: 33mmLDR: Blank Diameter/Product Diameter 13

Result of conical cup test

ＪＦＥ４４３ＣＴSUS 304

37.7mm 38.6mm

crack

specimen

die

punch

Thickness of specimen: 0.8mmLubrication: machine oil (JIS K2214-1)Punch diameter: 17mm

14

15

5．Ｈｉｇｈ Ｔｅｍｐｅｒａｔｕｒｅ Ｐｒｏｐｅｒｔｉｅｓ

(1)Ｈｉｇｈ Ｔｅｍｐｅｒａｔｕｒｅ Ｓｔｒｅｎｇｔｈ

0

50

100

150

200

500 600 700 800 900 1000

0.2％

T．Ｓ

(N/m

m2 )

0

100

200

300

400

500 600 700 800 900 1000

Ten

sile

stre

ngth

(N/m

m2 )

SUS304JFE436LJFE443CTJFE439L Thickness

1.5mm

Temperature(℃)Temperature(℃)

High temperature strength of JFE443CT is same as JFE439L。

(2)Oxidation Resistance(High Temperature Cyclic Oxidation Test：JIS Z 2282)

JFE439LJFE436LJFE443CTSUS304

900℃

-20

-10

0

10

20

30

40

0 100 200 300 400 500

Oxidation CountsM

ass G

ain(

g/m

2 )

Peel Off

-10

-5

0

5

10

0 100 200 300 400 500

Oxidation Counts

Mas

s Gai

n(g/

m2 )

800℃

Peel Off

<Testing Method>Oxidation(60min):→Temp Up Heat(kept Temp for 30min) →Cool down (200℃)Expose Point：30℃、Specimen：0.8x20x30mm

JFE443CT has better oxidation resistance than SUS304。

16

Cold rolling process

従来プロセス

出荷

JFEプロセス

冷間タンデムミル

ゼンジミア・ミル

連続焼鈍酸洗設備（KM-CAL)

連続焼鈍酸洗設備（CAＰ)

熱延焼鈍コイル

出荷

高能率タンデム圧延 ・高能率生産・インラインピックリング

冷延プロセスでの特徴普通鋼冷延設備活用による機能品の製造(総合ﾒｰｶｰの優位性＋ｲﾝﾗｲﾝﾋﾟｯｸ工程化)Conventional process

JFE high efficient process by using carbon steel facilities

Sendzimir and cluster mill

Cold tandem mill

Hot rolled and annealed coil

Continuous annealing and pickling line

High speed continuous annealing line with in-line pickling process

2BProduct

KD, KBProduct

High efficient cold rolling process by using carbon steel facilities makes the cost of stainless steels down.

17

“Functional Products” (KD,KB)

JFE Steel has 4 type finishes for ferritic Stainless Steel.

High

BA

２BKB

KD

Brightness

Low

Cost HighLow

“Functional products” are cost performance products.

18

Surface Difference Compared 2B ,KB & KD( Tandem Rolled)

1. Surface Roughness(μm)

2B KB KDRaRmax

0.050.55

0.524.66

0.303.00

2. Surface Appearance

KD2B KBRecommended Applications: (1) Hidden Parts : Auto Exhaust System, LCD Frame Panel (2) Surface Coated: Reefer Container (3) Polished Surface: Elevator, Escalator, Home Appliance Panel, BBQ, 19

Nickel Price

1093 1058

1182 1164

1429

1845

1483

1376

1560

16801735

705

617

1287

0

1

2

3

4

5

6

7

8

9

10

11

12

'02/下 '03/上 '03/下 '04/上 '04/下 '05/4 '06/1 '06/4 May 30 June 13 June 14 June 21 June 30 July 40

500

1000

1500

2000

Nickel Price at LME & 8% Nickel cost

Nickel Price（$/Ib）

Nickel Price

8%Nickel Cost (US$/ton）

8% Nickel Cost