Seamless steel pipes of ships
Standards:
China Classification Society materials and welding specifications - China Classification Society（CCS）
Det Norske Veritas (DNV) specification - Det Norske Veritas (DNV)
Lloyd's Register (LR) specification - British Lloyd's Register (LR)
Germany Lloyd's Register (GL) specification - Germany Lloyd's Register (GL)
American Bureau of Shipping (ABS) specification - American Bureau of Shipping (ABS)
France Classification Societies (BV) specification - France Classification Societies (BV)
Italy Classification Societies (RINA) specification - Italy Classification Societies (RINA)
Japan Classification Societies (NK) specification - Japan Classification Societies (NK)
GB/T5312 —— China national standards
Uses:
For marine boiler and superheater and Ⅰ, Ⅱ-pressure piping systems with seamless steel pipe
Steel pipes No. of main production:
320、360、410、460、490 ect.
Dimensional tolerance:
|
Pipe types
|
Outer-caliber（D）
|
Thickness（S）
|
|
|
Pipe outer-caliber(mm)
|
Allowable warp(mm)
|
Pipe thickness(mm)
|
Allowable warp(mm)
|
|
Hot-rolled pipes
|
＞219
|
±1.0％
|
＞20
|
±10％
|
Mechanical Properties:
|
Standards
|
Steel pipes No.
|
Tensile strength（MPa）
|
Bend strength（MPa）
|
Elongation（％）
|
|
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
|
Chemical composition:
|
Standards
|
Steel pipes No.
|
Chemical composition（％）
|
|
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
|
注：Residual elements: Cr≤0.25％，Mo≤0.10％，Ni≤0.30％，Cu≤0.30％, gross ≤0.70％
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