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Seamless steel pipes in large calibers for gas cylinders

Seamless steel pipes in large calibers for gas cylinders
Standards:
GB18248 —— China national standards
Q/321088HGB3 —— Enterprise standards of Jiangsu Chengde Steel pipe Co., Ltd.
ASTM A519 —— American Materials and Testing institution standards
Uses:
For the Seamless steel pipes in large calibers for gas cylinders
Steel pipes No. of main production:
4130X
 
Dimensional tolerance:

Pipe types

Outer-caliber（D）

Thickness（S）

Hot-rolled pipes

Pipe outer-caliber(mm)

Allowable warp(mm)

Pipe thickness(mm)

Allowable warp(mm)

φ559

±1.0％

17.0

－0％，＋25

Mechanical Properties:

Standards

Steel pipes No.

Tensile strength（MPa）

Bend strength（MPa）

Bend ratio

Elongation（％）

Impact energy Akv（J）

Hardness

Q/321088HGB3

4130X

725～865

485～735

≤0.85

≥20

－40℃≥40

195～269HB

Chemical composition:

Standards

Steel pipes No.

Chemical composition（%）

C

Si

Mn

P

S

Cr

Ni

Cu

Mo

V

Q/321088HGB3

4130X

0.25～0.35

0.15～0.35

0.40～0.90

≤0.020

≤0.010

0.80～1.10

≤0.25

≤0.20

0.15～0.25

≤0.08