Grade

Chemical Compositions %

Tensile Test

Yield Point or Yield Strength
N/mm ²

Tensile

Strength N/mm ²

Elongation

C

Mn

P

S

Thickness (mm)

Thickness

(mm)

Test
Piece

%
(min)

t≦16

16＜t≦40

40＜t≦100

t＞100

SS330

─

─

0.050
max

0.050
max

205
min

195
min

175
min

165
min

330-430

6≦t≦16

No.1A

21

16＜t≦50

No.1A

26

40＜t

No.4

28

SS400

245
min

235
min

215
min

205
min

400-510

6≦t≦16

No.1A

17

16＜t≦50

No.1A

21

40＜t

No.4

23

SS490

285
min

275
min

255
min

245
min

490-610

6≦t≦16

No.1A

15

16＜t≦50

No.1A

19

40＜t

No.4

21

SS540

0.30
max

1.60
max

0.040
max

0.040
max

400
min

390
min

─

─

540 min

6≦t≦16

No.1A

13

16＜t≦40

No.1A

17

1.Alloy elements other than those shown in the above table may be added necessary.

2.For the elongation of No.4 test piece for steel plates over 90mm in thickness, it shall be subtracted 1% from the valuesof per each increase of 25mm or its fraction in thickness. However, the limit to be subtracted shall be 3%.