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船舶用无缝钢管
Seamless steel tubes for vessel

Tubes for ship building

船舶用无缝钢管用于船用锅炉与过热器和Ⅰ、Ⅱ级压力管系用无缝钢管的制造。

标准:
用途:
尺寸公差:

钢管种类

外径(D)

钢管壁厚(S)

冷拔管

钢管外径(mm)

允许偏差(mm)

钢管壁厚(mm)

允许偏差(mm)

>30~50

±0.3

≤30

±10%

>50~219

±0.8%

热轧管

>219

±1.0%

>20

±10%

力学性能:

标准

牌号

抗拉强度(MPa)

屈服强度(MPa)

伸长率(%)

GB/T5312

320

320~410

≥195

≥25

360

360~480

≥215

≥24

410

410~530

≥235

≥22

460

460~580

≥265

≥21

490

490~610

≥285

≥21

化学成分:

标准

牌号

化学成分(%)

C

Si

Mn

P

S

GB/T5312

320

≤0.16

≤0.35

0.40~0.70

≤0.035

≤0.035

360

≤0.17

≤0.35

0.40~0.80

≤0.035

≤0.035

410

≤0.21

≤0.35

0.40~1.20

≤0.035

≤0.035

460

≤0.22

≤0.35

0.80~1.40

≤0.035

≤0.030

490

≤0.23

≤0.35

0.80~1.50

≤0.035

≤0.030

备注:
残余元素Cr≤0.25%,Mo≤0.10%,Ni≤0.30%,Cu≤0.30%总量≤0.70% 


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