Designation No. 

Condition

Tensile  Strength [M Pa]

permanent set stress

[greater than or equal]

Elongation [%]

[greater than or equal]

Gr1

M

280~420

170

24

Gr2

M

370~530

250

20

Gr3

M

440~620

320

18

Gr7

M

370~530

250

20

[greater than or equal]

440

------

18

Designation No.

manufacturing method

Size[mm]

Standard

use

Gr1     Gr2

Gr3     Gr4

Rolling

Dia3~Dia110

ASTM B337

ASTM B338

Piping

Regenerator

Marine equipment

welding

Dia6~Dia30