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The Seamless steel pipe for ship building usage are mainly used for Level 1& Level 2 pressure pipe in piping system, boiler and super-heated unit of shipbuilding.
- Classification of ships:
- Standard for malerials and wielding from Chinese classifying society Chinese clasifying society(CCS)
- Standard of DNV Det Norske Veritas(DNV)
- Standard of Lloyd’S Register of UK(LR) Lloyd’S Register of UK(LR)
- Standard of Germanischer Lloyd Germanischer Lloyd(GL)
- Standard of American Bureau of Shipping(ABS)American Bureau of Shipping(ABS)
- Standard of BUREAU VERITAS(BV)BUREAU VERITAS(BV)
- Standard of RINA Italian classification society(RINA)
- Standard of NIPPON KAIJI KYOKAI(NK)NIPPON KAIJI KYOKAI(NK)
- GB/T5312 Chinese national standard
Appication：- Seamless steel tubes for manufacturing marine boilers and ovemeaters as we as pressure pipes opf grade I and Ⅱ．
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Model N0．of major steel tubes- 320，360，410，460，490，etc．
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Types of steel tubes
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Outer diameters
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wall thickness
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Cold-rolled tubes
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Rube size(mm)
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tolerances (mm) |
Tube sizes (mm) |
Tolerances (mm) |
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＞30～50
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±0.3
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≤30
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±10％
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＞50～219
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±0.8％
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Hot-rolled tubes
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＞219
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±1.0％
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＞20
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±10％
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Mechanocal properties：
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Standard code
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Models of steel tubes
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Tensile strength（MPa）
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Yield strength（MPa）
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Elongation（％）
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GB/T5312
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320
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320～410
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≥195
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≥25
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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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460
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460～580
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≥265
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≥21
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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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Chemical compisition:
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Standard code
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Models of steel tubes
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Chemical compisition（％）
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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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GB/T5312
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320
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≤0.16
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≤0.35
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0.40～0.70
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≤0.035
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≤0.035
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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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≤0.035
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≤0.035
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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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≤0.035
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≤0.035
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460
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≤0.22
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≤0.35
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0.80～1.40
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≤0.035
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≤0.030
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490
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≤0.23
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≤0.35
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0.80～1.50
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≤0.035
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≤0.030
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Note：
residual elements:Cr≤0.25％，Mo≤0.10％，Ni≤0.30％，Cu≤0.30％aggregate≤0.70％
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Society
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Standard or usage
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Steel grade
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GLR
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Non alloly
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GL-R 410
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GB 18248
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37Mn
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EN 10297
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34CrMo4
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DNV
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for pressure
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ASTM A53/A53M/A53B
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ABS
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for pressure
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Grade 3
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BV
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for pressure
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410HB
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LR
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for pressure
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410
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KR
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for pressure
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RST138,RST142,RST238,RST242,RST249,RST338, RST342
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NK
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for pressure
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grade 1 No3/ KSTPG 42
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CCS
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for pressure
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360,410,460,490
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