Stainless Steel Grade Compositions for Ferritic, Duplex, Martensitic and Precipitation Hardening Stainless

Grade

UNS No.

Typical Composition (%)

Description and Applications

C

Mn

Cr

Mo

Ni

others

Ferritic Stainless Steels

3CR12

S41003

0.03

0.5

11.5

 

0.35

 

"Utility" stainless steel with useful resistance to wet abrasion, and good formability and weldability.

409

S40900

0.06

1

11.13

   

Ti 0.75

Resists atmospheric and automotive exhaust gas corrosion. Used extensively in auto exhaust systems.

430

S43000

0.03

0.4

16.5

     

Good combination of corrosion resistance and formability. Used for interior panelling and cold-headed fasteners.

430F

S43020

0.07

1

16

   

S 0.25

Free-machining version of 430.

444

S44400

0.02

0.8

18

2

 

Ti 0.4

Weldable chromium-molybdenum Ferritic grade, has excellent corrosion resistance to hot water containing minor amounts of chlorides.

Duplex Stainless Steels

2205

S31803

0.03

0.8

22

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3

5

N 0.15

High strength and good resistance to pitting corrosion and stress corrosion cracking.

UR52N+

S32520

0.02

0.8

25

3.5

7

N 0.25
Cu 0.7

Super duplex grade, exhibiting exceptional resistance to hot chlorides and strong acids, and with high strength.

Martensitic Stainless Steels

410

S41000

0.1

0.5

12

     

Resists dry atmospheres, fresh water and other mild environments. Hardened and tempered to achieve best strength and corrosion resistance.

416

S41600

0.12

1.0

12

     

Free-machining hardenable grade. Corrosion resistance not as good as for 410.

420

S42000

0.3

0.5

13

     

Higher carbon content than 410 gives higher hardness for cutlery, knife blades, dies and surgical instruments.

431

S43100

0.2

0.6

15

 

2

 

High strength, excellent toughness and corrosion resistance similar to that of 304. Used for pump shafts, bolts and valve components.

Precipitation Hardening Stainless Steels

630

S17400

0.05

0.6

16

 

4

Cu 4
Nb 0.25

Precipitation hardening ("aging") treatment after machining gives high strength without distortion. Corrosion resistance similar to 304.

 

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