Mechanical Properties

 Grade

Tensile Strength

  Yield Strength

Elongation

 Reduction of Area

Impact Strength

Hardness

σb/MPa

σb/MPa

δ5(%)

ψ(%)

Aku 2/J

HBS

≥

≤

20

400

245

20

-

-

-

35

510

305

17

-

-

-

45

590

335

14

-

-

-

27SiMn

980

935

12

40

39

217

Remark:

1The tube will be delivered after hot rolled

2Necessary impact test If wall thickness ≥14mm.

Chemical Composition%

Grade

C

Si

Mn

P

S

Cr

Ni

Cu

≤

20

0.17~0.24

0.17~0.37

0.35~0.65

0.035

0.035

0.25

0.25

0.2

35

0.32~0.40

0.17~0.37

0.50~0.80

0.035

0.035

0.25

0.25

0.2

45

0.42~0.50

0.17~0.37

0.50~0.80

0.035

0.035

0.25

0.25

0.2

27SiMn

0.24~0.32

1.10~1.40

1.10~1.40

0.035

0.035

0.3

0.3

0.3