Material Specifications

KOSEN Valves--Reference of ASTM Material Specifications

Covering Cast and Forged Valves, Fittings, Flanges and Unions 

Material 

Forgings 

Castings 

Wrought Fittings 

Carbon Steel
Cold Tempterature Service 

A 105
A350-LF2 

A216-WCB 

A234-WPB
A420-WPL6 

Carbon-1/2 Moly Alloy Steel
High Tempterature Service 

A182-F1 

A217-WC 1
A352-LC1 

A234-WP1 

3-1/2 Nickel Alloy Steel
Low Tempterature Service 

A350-LF3 

A352-LC3

A420-WPL3

1/2 Cr-1/2 Mo Alloy Steel
1/2 Cr-1/2 Mo-1 Ni Alloy
3/4 Cr-1 Mo-3/4 Ni Alloy Steel
1 Cr-1/2 Mo Alloy Steel

A182-F2
A182-F12 CL2 

A217-WC 4
A217-WC5 
 

A234-WP12 CL2 

1-1/4 Cr-1/2 Mo Alloy Steel
2-1/4 Cr-1 Mo Alloy Steel
5 Cr-1/2 Mo Alloy Steel
5 Cr-1/2 Mo Alloy Steel
9 Cr-1 Mo Alloy Steel
13 Cr Alloy Steel 

A182-F11 CL2
A182-F22 CL 3
A182-F 5
A182-F 5a 
A182-F 9
A182-F6

A217-WC6
A217-WC9
A217-C 5
A217-C 12
A743-CA15 
 

A234-WP11 CL2
A234-WP22 CL 3
A234-WP5
A234-WP9
 

Type 304 Stainless Steel (18 Cr-8 Ni)
Standard
Low Carbon 
High Temperature Service  

A182-F 304
A182-F 304L 
A182-F304H 
 

A351-CF3
A351-CF8 
 

A403-WP 304
A403-WP 304L 
A403-WP304H 
 

Type 310 Stainless Steel (25 Cr-20 Ni)
Type 316 Stainless Steel (16 Cr-12 Ni-2 Mo)
Standard 
Low Carbon 
High Temperature 

A182-F310H
A182-F 316
A182-F 316L 
A182-F316H

A351-CK20
A351-CF3M 
A351-CF8M 

A403-WP310

A403-WP 316
A403-WP 316L 
A403-WP316H

Type 317 Stainless Steel (18 Cr-13 Ni-3 Mo)
Type 321 Stainless Steel (18 Cr-10 Ni-Ti)
Standard 
High Temperature Service  

A182-F 321
A182-F321H 
 

A403-WP317

A403-WP 321
A403-WP321H 

Type 347 Stainless Steel (18 Cr-10 Ni-Cb)
Standard
High Temperature Service  

A182-F 347
A182-F321H 

A351-CF 8C 

A403-WP 347
A403-WP347H

Type 348 Stainless Steel (18 Cr-10 Ni-Cb)
Standard
High Temperature Service  

A182-F 348
A182-F348H 
 

A403-WP 348
A403-WP438H 
 

API Trim Materials

Trim Number

Seat Ring Surface

Wedge Seat Surface

Stem

Backseat Bushing

1

F6

F6

F6

F6

2

F304

F304

F304

F304

5

Stellite

Stellite

F6

F6

6

Cu-Ni

F6

F6

F6

8

Hardfaced

F6

F6

F6

9

Monel

Monel

Monel

Monel

10

F316

F316

F316

F316

12

F316/HF

F316/HF

F316

F316

13

A20

A20

A20

A20

18

Stellite

F6

F6

F6