JIS Steel Norms For General structural steel 
and welding structural steel

JIS G3101

Category

Symbol

Product Thickness mm

% Chemical Composition

Yield Point Mpa

Tensile Strength Mpa

% Elongation

180o b> 35mm Bending Diameter

V-notch Impact Test

c <

Si <

Mn

P<

S <

Others

L0 =50mm b0 = 25mm

L0 =200mm b0 = 40mm

Test Temper-
ature 0C

Impact Energy J >

Thickness

<5

>5

General Structural steel

SS330

< 12.7

0.15

0.30

<0.95

0.035

0.04

Alt > 0.010

205

300~430

>26

>21

1a

-

-

SS400

<16.0

0.21

0.30

<1.30

-

245

400~510

>21

>17

3a

SS490

1.6~12.5

0.22

0.25

<1.40

285

490~610

>19

>15

4a

SS540

2.3 ~6.0

0.30

0.25

<1.60

Other alloy elements may be added if necessary

400

>540

>16

>13

4a

Welding Structural steel

 

 

 

SM400A

1.6~16.0

0.23

0.35

>2.5xC

0.035

0.04

245

400~510

>23

>18

2a

-

-

SM400B

1.6~12.0

0.20

0.60~1.40

0

27

SM400C

2.3~12.0

0.18

< 1.40

0

47

SM490A

1.6~16.0

0.20

0.55

<1.60

0.035

0.04

-

-

SM490B

1.6~12.0

0.18

325

490~610

>22

>17

3a

0

27

SM490C

2.0~5.0

0

47

SM490YA

3.0~12.7

0.20

365

490~610

>19

>15

3a

-

-

SM490YB

2.0~12.7

0

27

SM520B

1.5~12.0

0.20

365

520~635

>19

>15

3a

0

27

SM520C

1.6~6.0

0

47

Welten590RE

1.6~12.0

0.12

0.15 ~0.55

<2.00

0.030

0.030

Ti < 0.15

450

590~705

>20

2a

-5

47

JIS 3132        Symbols of Grades

SPHT 1

1.2 or over up to and incl.13

SPHT 2

SPHT 3

 1.6 or over up to and incl.13

SPHT 4

Chemical Composition

Grade symbol

 C

 Si

Mn

P

S

SPHT 1

0.10  max

 0.35 max

0.50 max

0.040 max

0.040  max

SPHT 2

0.18 max

0.35

0.60 max

0.040 max

0.040 max

SPHT 3

0.25 max

0.35

0.30 to 0.90

0.040 max

0.040 max

SPHT 4

0.30 max

0.35

0.30 to 1.00

0.040 max

0.040 max

Note : The maximum silicon content may be modified to 0.04 % max. by agreement between the purchaser and the supplier.

Mechanical Properties (Applicable  on and after Jan 1, 1991)

Grade Symbol

Tensile Strength

N/mm2

Elongation %

Tensile test piece

Bendability

 

1.2 mm or over to and excl. 1.6 mm in thickness

1.6 mm or over to and excl. 3.0 mm in thickness

3.0 mm or over to and excl. 6.0 mm in thickness

6.0 mm or over to and excl. 13 mm in thickness

Bending angle (Degree)

Inside radius

3.0 mm or under in thickness

Over 3.0 mm up to and incl. 13 mm in thickness

Test Piece

SPHT1

270 min

30 min

32 min

35 min

37 min

N0. 5 taken in rolling direction

180

Flat on itself

Thickness x 0.5

No. 5 taken in rolling direction

SPHT2

340 min

25 min

27 min

30 min

32 min

180

Thickness x 1.0

Thickness x 1.5

SPHT3

410 min

20 min

22 min

25 min

27 min

180

Thickness x 1.5

Thickness x 2.0

SPHT4

490 min

15 min

18 min

20 min

27 min

180

Thickness x 1.5

Thickness x 2.0