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Ferritic & martensitic stainless steel

Ferritic stainless steels and martensitic stainless steel

 

Chemical Content and Mechanical Properties for Ferritic and Martensitic Stainless Steel Tube

           
   

 Chemical Composition(%)

Others

     
 

Steel Grade

Mechanical Properties

Elongation

Hardness

Standard

 

C

Mn

Si

P

S

Cr

Ni

Y. S. (MPa)

T. S. (MPa)

(%)

(HRB)

A/SA268

TP405

≤ 0.08

≤ 1.00

≤ 1.00

≤ 0.040

≤ 0.030

11.50~14.50

≤ 0.50

Al:0.10~0.30

≥ 415

≥ 205

≥ 30

≤ 85

A/SA268

TP410

≤ 0.15

≤ 1.00

≤ 1.00

≤ 0.040

≤ 0.030

11.50~13.50

   

≥ 415

≥ 205

≥ 30

≤ 85

A/SA268

TP410S

≤ 0.08

≤ 1.00

≤ 1.00

≤ 0.040

≤ 0.030

11.50~13.50

 

≥ 415

≥ 205

≥ 30

≤ 85

A/SA268

TP430

≤ 0.12

≤ 1.00

≤ 1.00

≤ 0.040

≤ 0.030

16.00~18.00

 

≥ 415

≥ 205

≥ 30

≤ 85

A/SA268

TP430Ti

≤ 0.10

≤ 1.00

≤ 1.00

≤ 0.040

≤ 0.030

16.00~19.50

≤ 0.75

Ti: 5C~0.75

       

A/SA268

TP446

≤ 0.20

≤ 1.50

≤ 1.00

≤ 0.040

≤ 0.030

23.00~27.00

≤ 0.75

N: ≤ 0.25

≥ 415

≥ 205

≥ 30

≤ 85

A/SA268

TP409

≤ 0.08

≤ 1.00

≤ 1.00

≤ 0.045

≤ 0.030

10.50~11.70

≤ 0.50

Ti: 6C~0.75

≥ 415

≥ 205

≥ 30

≤ 85

                 

N: ≤ 0.04

       

A/SA268

TP439

≤ 0.07

≤ 1.00

≤ 1.00

≤ 0.040

≤ 0.030

17.00~19.00

≤ 0.50

Ti: 0.2+ 4(C+N)~1.1

≥ 380

≥ 205

≥ 22

≤ 80

                 

Mo: 1.75~2.5

       

A/SA268

TP444

≤ 0.025

≤ 1.00

≤ 1.00

≤ 0.040

≤ 0.030

17.50~19.50

≤ 1.00

(Ti+Cb): 0.2+ 4(C+N)~0.8 N:≤ 0.035

≥ 415

≥ 220

≥ 22

≤ 81

A/SA756/268

440C

0.95~1.10

≤ 1.00

≤ 1.00

≤ 0.025

≤ 0.025

16.00~18.00

3.00~5.00

Mo: 0.4~0.7

       

A/SA693

17-4PH

≤ 0.07

≤ 1.00

≤ 1.00

≤ 0.040

≤ 0.030

15.50~17.50

 

Cu: 3.0~5.0 Nb: 0.15~0.45

       

GOST9941-81

15Cr25Ti

≤ 0.15

≤ 0.80

≤ 1.00

≤ 0.035

≤ 0.025

24.00~27.00

 

Ti:5C~0.90

≥ 415

≥ 205

≥ 30

≤ 85

API 5CT

L80/9Cr

≤ 0.15

0.30~0.60

≤ 1.00

≤ 0.020

≤ 0.010

8.00~10.00

Mo: 0.90~1.10

 

≥ 655

≥ 552

≥ 20

≤ 23HRC

API 5CT

L80/13Cr

0.15~0.22

0.25~1.00

≤ 1.00

≤ 0.020

≤ 0.010

12.0~14.0

   

≥ 655

≥ 552

≥ 20

≤ 23HRC

 

Size Tolerance

   
 

  Dimension(D)

 Wall thickness(S)

   

Size Tol.

   

(ASTM A1016)

           
 

(mm)

Tolerance(mm)

(mm)

 Tolerance(mm)

   

 Cold Drawn/Rolled Tube

<25.4

+/- 0.1

≤38.1

+20%~0

   

25.4~38.1

+/- 0.15

   

>38.1~<50.8

+/- 0.2

>38.1

+22%~0

   

50.8~<63.5

+/- 0.25

   

63.5~<76.2

+/- 0.3

   
             

Size Tol.for pipes per ASTM A530

  Available Sizes

 

 OD

 WT

 Length

产品 Products

Inch

MM

Inch

MM

Ft max.

Mt max.

Tube

1/2″-3″

12.0-76.2

0.02″-0.5″

0.5-12.0

105′

32

Pipe

NPS1/2″-6″

21.34-168.3

Sch10-Sch80

2.11-12.7

98′

30

 

 

Ferritic stainless steels include grade like 430 and contain only chromium as a major alloying element. The quantity of chromium present ranges from 10.5% to 18%.

They are known for their moderate corrosion resistance and poor fabrication properties. Fabrication properties can be improved by alloy modifications and are satisfactory in grades such as 434 and 444. Ferritic stainless steels cannot be hardened by heat treatment and are always used in the annealed condition. Ferritic stainless steel are magnetic. They are also not susceptible to stress corrosion cracking. Weldability is acceptable in thin sections but decreases as section thicknesses increase.

Martensitic Stainless Steels

High carbon and lower chromium content are the distinguishing features of martensitic stainless steels when compared with ferritic stainless. Martensitic stainless steel include 410 and 416. Hardened martensitic steels cannot be successfully cold formed. They are magnetic, have moderate corrosion resistance and poor weldability. Martensitic stainless steel is a specific type of stainless steel alloy.