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Ship Duilding Tube
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GB/T5312-1999（Hot rolling, extrusion, pipe expansion）
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Ship Duilding Tube
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Size tolerance
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Outer diameter(D)
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≤159
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>159
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Allowable deviation of outer diameter
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±1.0%(Mini±0.5mm)
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±1.25%
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wt(S)
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≤20
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S>20
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D≥351
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Allowable deviation of outer diameter
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+15%,-10%(mini+0.45mm,-0.30mm)
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±10%
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±15%
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Longitudinal mechanical properties of Ship Duilding Tube
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Category
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Grade
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Tensile strength(MPa)
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Yield point(MPa)≥
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Elongation（%）≥
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Carbon steel and carbon-manganese steel
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360
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360-480
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215
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24
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410
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410-530
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235
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22
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490
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490-610
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285
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21
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1Cr0.5Mo
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440
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440-600
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275
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22
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2.25Cr1Mo
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410
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410-560
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235
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20
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490
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490-640
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275
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16
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Chemical composition of marine pipe
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Classification of marine pipes
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Grade
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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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Cr
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Mo
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Ni
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Cu
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Sn
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W
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总量
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Carbon steel and carbon-manganese steel
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360
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≤0.17
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≤0.35
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0.40-0.80
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0.04
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0.04
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≤0.25
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≤0.10
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≤0.30
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≤0.30
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-
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-
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≤0.70
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410
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≤0.21
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≤0.35
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0.40-1.20
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0.04
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0.04
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≤0.25
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≤0.10
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≤0.30
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≤0.30
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-
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-
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≤0.70
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440
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≤0.23
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≤0.35
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0.80-1.50
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0.04
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0.04
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≤0.25
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≤0.10
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≤0.30
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≤0.30
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-
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-
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≤0.70
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1Cr0.5Mo
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440
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0.10-0.18
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0.10-0.35
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0.40-0.70
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0.04
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0.04
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0.70-1.10
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0.45-0.65
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≤0.30
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≤0.25
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≤0.03
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≤0.020
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-
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2.25Cr1Mo
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410
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0.08-0.15
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0.10-0.35
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0.40-0.70
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0.04
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0.04
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2.00-2.50
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0.90-1.20
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≤0.30
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≤0.25
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≤0.03
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≤0.020
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-
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