Seamless steel pipe for ship building usage |
- 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.
Types of steel tubes | Outer diameters | wall thickness | ||
Cold-rolled tubes | Rube size(mm) | tolerances (mm) | Tube sizes (mm) | Tolerances (mm) |
>30~50 | ±0.3 | ≤30 | ±10% | |
>50~219 | ±0.8% | |||
Hot-rolled tubes | >219 | ±1.0% | >20 | ±10% |
Mechanocal properties:
Standard code | Models of steel tubes | Tensile strength(MPa) | Yield 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 compisition:
Standard code | Models of steel tubes | Chemical compisition(%) | ||||
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 |
Note:
residual elements:Cr≤0.25%,Mo≤0.10%,Ni≤0.30%,Cu≤0.30%aggregate≤0.70%
Society | Standard or usage | Steel grade | |
GLR | Non alloly | GL-R 410 | |
GB 18248 | 37Mn | ||
EN 10297 | 34CrMo4 | ||
DNV | for pressure | ASTM A53/A53M/A53B | |
ABS | for pressure | Grade 3 | |
BV | for pressure | 410HB | |
LR | for pressure | 410 | |
KR | for pressure | RST138,RST142,RST238,RST242,RST249,RST338, RST342 | |
NK | for pressure | grade 1 No3/ KSTPG 42 | |
CCS | for pressure | 360,410,460,490 |