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．
View more application...- 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％
