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Introduction Of Several Alternatives To 304 Stainless Steel

Jul 27, 2021

1. TTS443 ferritic stainless steel with high corrosion resistance without nickel and molybdenum

2. 436L/444 ferritic stainless steel with excellent corrosion resistance and formability

3. Economical and practical 301 series austenitic stainless steel


TTS443 ferritic stainless steel with high corrosion resistance without nickel and molybdenum


Features of TTS443


1. Excellent corrosion resistance

1) The chromium content is increased to 21%, which has the same excellent corrosion resistance as SUS304

2) Because the impure substances such as carbon and nitrogen are reduced, and the stabilizing effect is added

Titanium can maintain good corrosion resistance after welding.


2. Excellent molding performance

Molding performance is the same as 436L, superior to 430


3. Price advantage and stability

1) Because there is no need to add nickel, the price is cheaper than SUS304

2) Because there is no need to add nickel and molybdenum, even if the prices of these two metals increase, it will not be affected


Chemical Composition(%)

Grades

Cr

Ni

Mo

Ti

Cu

TTS443

21

-

-

0.3

0.4

0Cr17(430)

17

-

-

-

-

00Cr18Ni9(304)

18.2

8.2

-

-

-


● No nickel and no molybdenum

● Chromium content increased to 21%

● Low carbon and nitrogen content

● Add stabilizing element titanium


Mechanical Performance

Grade

YS(MPa)

TS(MPa)

Elongation(%)

R value

Hardness(Hv)

Cone Cupping(mm)

TTS443

305

483

31

1.3

161

38.6

0Cr17(430)

260

645

60

1.0

185

37.7

00Cr18Ni9(304)

320

490

29

1.0

170

35.0

The r value is higher than that of SUS304, so the deep drawability is superior


Physical Properties

Grade

Density(g/cm3)

Resistance(10-6Ω·cm)

Magnetism

Specific heat 25℃

(J/kg· ℃)

Thermal conductivity 100 ℃

(W/m· ℃)

Thermal expansion coefficient 20-100 ℃(10-6/ ℃)

Young's modulus (Gpa)

TTS443

7.74

58

Magnetic

440

22.5

10.5

204

430

7.70

60

Magnetic

460

26.1

10.4

200

304

7.93

70

Non-magnetic

500

16.2

17.3

193


Compared with 304:

  Low density, under the same weight, the material utilization rate can be increased by 2.5%;

  Good thermal conductivity;

  The coefficient of thermal expansion is small.


Weldability

Due to the reduction of impurity carbon and nitrogen elements and the addition of stabilizing titanium element, the corrosion resistance of the welded joint is very superior.

When welding dissimilar steel with 304, the corrosion resistance may be greatly reduced, please be aware. (Measures: limit the dissolution of T443 in the weld metal; change the material (304L)).

Compared with 304, because of the low thermal expansion coefficient and high thermal conductivity, it is not easy to deform after welding.


436L/444 ferritic stainless steel


436L/444 Features

Reduce impure substances such as carbon and nitrogen, and add elements such as molybdenum and titanium, which have excellent corrosion resistance and formability; 

It is more resistant to stress corrosion than SUS304 in harsh corrosive environments such as coastal atmosphere decoration and pools;

No need to add nickel, the price is cheaper than SUS304.


Chemical composition(%)

Grades

Executive standard

C

Si

Mn

P

S

Cr

Ni

Mo

Ti

Nb

N

SUS436L

GB
     AISI
     JIS
     EN

0.007

0.47

0.24

0.016

0.003

17.5

0.12

1.09

0.15

0.22

0.013

SUS444

0.010

0.25

0.14

0.014

0.003

18.3

0.18

1.99

0.16

0.32

0.013

304

0.05

0.5

1.0

0.023

0.002

18

8.0

0.06


Low carbon and nitrogen content

Nickel free

Contains a small amount of molybdenum

Add stabilizing elements titanium and niobium


Physical Properties

Grade

Density(g/cm3)

Resistance(10-6Ω·cm)

Magnetism

Specific heat 25℃
   (J/kg· ℃)

Thermal conductivity 100 ℃
   (W/m· ℃)

Thermal expansion coefficient 20-100 ℃(10-6/ ℃)

Young's modulus (Gpa)

444

7.74

53

Magnetism

435

23.8

10.4

210

436L

7.73

53

Magnetism

430

23.6

10.4

212

304

7.93

70

Non-Magnetism

500

16.2

17.3

193


Compared with 436L/444 and 304:

  With low density and the same weight, 2.5% of materials can be saved;

  Good thermal conductivity;

  The coefficient of thermal expansion is small;

  The modulus of elasticity is large.


Economical and practical 301 austenitic stainless steel


Feature:

The strength is higher than 304, especially suitable for making vehicles, electronic components, spring components, structural parts and wheel covers, etc.;

It is basically equivalent to 304 in terms of corrosion resistance, formability and weldability, and has good surface processing properties. It can be processed into products of different surface groups such as BA, HL, No.3, No.4, etc., and is widely used Decoration industry

The nickel content is 1-2% lower than that of 304, and the manufacturing cost is lower.


Chemical Composition(%)

Grade

C

Si

Mn

P

S

Cr

Ni

301

≤0.15

≤1.00

≤2.00

≤0.045

≤0.030

16.00~18.00

6.00~8.00

304

≤ 0.08

≤ 1.00

≤ 2.00

≤ 0.045

≤ 0.030

18.0-20.0

8.0-10.5

1-2% lower than 304 nickel content


Physical Properties

Grade

Density(g/cm3)

Coefficient of Elasticity GPa

Resistance micro ohm -cm

Specific heat J/KgK

Thermal conductivity 20-100℃
   W/mK

Thermal expansion coefficient 10-6/℃

Permeability

0-100

0-315

0-538

0-648

0-982

 

301

7.98

193

72

503

0.113

17.3

17.8

18.0

18.2

19

1.02

304

7.98

193

72

503

0.113

17.3

17.9

18.4

18.8

20

1.02


Mechanical Performance

Grade

YS(MPa)

TS(MPa)

Elongation(%)

Durable strength

Bending

301

758

315

60

241

180° R=1/2t  No cracks

304

579

290

62

241

180° R=1/2t  No cracks



The strength is higher than 304, and the bending performance is good. It is suitable for making vehicles, electronic components, spring components, structural parts and wheel covers.