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钢管种类
|
钢管尺寸
mm
|
允许偏差
|
|||
普通级
|
高级
|
||||
热轧(挤)管
|
外径
D
|
≤159
|
+1.0%(最小值为+0.5mm)
|
+0.75%(最小值为+0.3mm)
|
|
>159
|
+1.0%
|
+0.90%
|
|||
壁厚
S
|
<3.5
|
+15%(最小值为+0.48mm)
-10% (最小值为-0.32mm)
|
+1.0%(最小值为+0.2mm)
|
||
3.5~20
|
+15%
-10%
|
+10%
|
|||
>20
|
D<219
|
+10%
|
+7.5%
|
||
D≥219
|
+12.5%
-10.0%
|
+10%
|
|||
冷拔(轧)管
|
外径
D
|
≤30
|
+0.20mm
|
+0.15mm
|
|
>30~50
|
+0.30mm
|
+0.25mm
|
|||
>50
|
+0.8%
|
+0.6%
|
|||
壁厚
S
|
2~3
|
+12%
-10%
|
+10%
|
||
>3
|
+10%
|
+7.5%
|
标准
|
牌号/抗拉强度(Mpa)
|
屈服强度(Mpa)
|
伸长率(%)
|
|
5310-95
|
20G
|
410~550
|
≥ 245
|
≥ 24
|
25MnG
|
≥ 415
|
≥ 240
|
≥ 22
|
|
15MoG
|
450~600
|
≥ 270
|
≥ 22
|
|
15CrMoG
|
440~640
|
≥ 235
|
≥ 21
|
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12Cr2MoG
|
450~600
|
≥ 280
|
≥ 20
|
|
12Cr1MoVG
|
470~640
|
≥ 255
|
≥ 21
|