国标钢管执行标准及相关参数:

无缝钢管是一种具有中空截面、周边没有接缝的长条钢材。钢管具有中空截面,大量用作输送流体的管道,如输送石油、天然气、煤气、水及某些固体物料的管道等。


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气瓶用大口径无缝钢管

标准:
GB18248 —— 中国国家标准
ASTM A519 —— 美国材料与试验学会标准

用途:
用于制造气瓶用热轧大口径无缝钢管
主要生产钢管牌号:4130X

尺寸公差:

钢管种类

外径(D)

壁厚(S)

热轧管

钢管外径(mm)

允许偏差(mm)

钢管壁厚(mm)

允许偏差(mm)

φ559

±1.0%

17.0

-0%,+25

 

力学性能:

标准

牌号

抗拉强度(MPa)

屈服强度(MPa)

屈强比

伸长率(%)

冲击功Akv(J)

硬度

Q/321088HGB3

4130X

725~865

485~735

≤0.85

≥20

-40℃≥40

195~269HB

 

化学成分:

标准

牌号

化学成分(%)

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

 


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