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GB/T8163-1999(熱軋、擠壓、擴管）
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尺寸公差
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標準
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外徑公差
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壁厚公差
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GB/T8163-1999
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D<50mm
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±0.50mm
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+15/-12.5%
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最小：+0.45mm
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D≥50mm
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±1%
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最小：-0.40mm
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縱向力學性能
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標準
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牌號
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抗拉強度(MPa)
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屈服強度(MPa) ≥
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延伸率(%)≥
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≤16
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>16mm
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GB/T8163-1999
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10
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335-475
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205
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195
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24
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20
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410-550
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245
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235
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20
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Q295
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430-610
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295
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285
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22
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Q345
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490-665
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325
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315
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21
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化學成份
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標準
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牌號
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C
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Si
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Mn
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P≤
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S≤
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Ni≤
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Cu≤
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Cr≤
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GB/T8163-1999
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10
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0.07-0.14
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0.17-0.37
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0.35-0.65
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0.035
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0.035
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0.25
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0.15
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0.25
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20
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0.17-0.24
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0.17-0.37
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0.35-0.65
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0.035
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0.035
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0.25
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0.25
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0.25
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Q295 A
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≤0.16
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≤0.55
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0.80-1.50
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0.045
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0.045
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0.30
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0.30
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0.30
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Q295 B
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≤0.16
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≤0.55
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0.80-1.50
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0.040
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0.040
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0.30
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0.30
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0.30
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Q345 A
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≤0.20
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≤0.55
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1.00-1.60
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0.045
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0.045
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0.30
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0.30
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0.30
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Q345 B
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≤0.20
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≤0.55
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1.00-1.60
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0.040
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0.040
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0.30
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0.30
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0.30
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Q345 C
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≤0.20
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≤0.55
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1.00-1.60
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0.035
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0.035
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0.30
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0.30
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0.30
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Q345 D
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≤0.18
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≤0.55
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1.00-1.60
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0.030
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0.030
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0.30
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0.30
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0.30
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Q345 E
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≤0.18
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≤0.55
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1.00-1.60
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0.025
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0.025
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0.30
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0.30
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0.30
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