Steel Composition

ASTM Specification and Grade

KS Specification and Grade

JIS Grade

Marking Symbol

Plate

 Carbon Steel

-

 A283-A

SB41

SS41

 Carbon Steel

-

 A242

SWS41B

SM41B

 Carbon Steel

-

 A242

SWS41B

SM41B

 Carbon Steel

WPB

 A515-65 or 70

SBB42

SB42

 Carbon Steel

WPC

 -

SBB49

SB49

 Carbon Steel

WPL6

 A516-60

SLAS39

-

 3 1/2% Ni Steel

WPL3

 A203-D

-

-

 2%Ni~1% Cu Steel

WPL9

 A203-A

-

-

 Carbon-Monobdenum Steel

WP1

 A204-B

SBB46M

-

 1% Cr-1/2% Monobdenum Steel

WP12

 A387-12

SCMV2

-

 1 1/4% Cr-1/2% Monobdenum Steel

WP11

 A387-11

SCMV3

-

 2 1/4% Cr-1% Monobdenum Steel

WP22

 A387-22

SCMV4

-

 5% Cr-1/2% Monobdenum Steel

WP5

 A387-5

SCMV6

-

 7% Cr-1/2% Monobdenum Steel

WP7

 -

-

-

 9% Cr-1% Monobdenum Steel

WP9

 -

-

-

 9% Cr-1% Mo-0/2%V+Cb+N

WP90

 A387-91

-

-

 18% Cr-8% Ni Steel

WP304

 A240-Type304

STS304

SUS304

 18% Cr-8% Ni-(0.04-0.10)% C Steel 

WP304H

 A240-Type304H

-

-

 18% Cr-8% Ni-0.035% C Steel

WP304L

 A240-Type304L

STS304L

SUS304L

 22% Cr-12% Ni Steel

WP309

 A240-Type309S

STS309S

SUS309S

 25% Cr-20% Ni Steel

WP310

 A240-Type310S

STS310S

SUS310S

 18% Cr-8% Ni-Cb + Ta Steel

WP347

 A240-Type347

STS347

SUS347

 18% Cr-8% Ni-Mo Steel

WP316

 A240-Type316

STS316

SUS316

 18% Cr-8% Ni-Mo-(0.04-0.10)% C Steel

WP316H

 A240-Type316H

-

-

 18% Cr-8% Ni-Mo-0.035% C Steel

WP316L

 A240-Type316L

STS316L

SUS316L

 18% Cr-8% Ni-Ti Steel

WP321

 A240-Type321

STS321

SUS321

 18% Cr-8% Ni-Ti-(0.04-0.10)% C Steel

WP321H

 A240-Type321H

-

-

 18% Cr-8% Ni-Cb+Ta-(0.04-0.10)% C Steel

WP347H

 A240-Type347H

-

-