Grade

Chemical Analysis(%)

C

Mn

Si

S

P

≤

SS400

0.14-0.22

0.30-0.65

0.30

0.05

0.045

S235JR

0.10-0.20

0.35-0.75

0.15-0.35

0.05

0.05

Q235

0.14-0.22

0.30-0.65

0.30

0.05

0.045

Model

(mm)

Thickness

 (mm)

Theoretical unit

Weight (kg/m)

20

3

0.889

20

4

1.145

25

3

1.124

25

4

1.459

30

3

1.373

30

4

1.786

35

3

1.578

35

4

2.072

35

5

2.551

40

3

1.852

40

4

2.422

40

5

1.976

44

3

2.002

44

4

2.638

38

3

1.719

38

4

2.261

48

3

2.19

48

4

2.889

48

5

3.572

50

3

2.332

50

4

3.059

50

5

3.77

50

6

4.465

56

3

2.624

56

4

3.446

56

5

4.251

56

6

6.568

63

4

3.907

63

5

4.822

63

6

5.721

63

8

7.469

63

10

9.151

70

4

4.372

70

5

5.397

70

6

6.406

70

7

7.398

70

8

8.373

75

5

5.818

75

6

6.905

75

7

7.976

75

8

9.03

75

10

11.089