Seamless steel pipe for ship building usage
The Seamless steelpipe for ship building usage are mainly used for Level 1& Level 2pressure pipe in piping system, boiler and super-heated unit ofshipbuilding.
- 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
Model N0of 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) |
3050 | ±0.3 | ≤30 | ±10 | |
50219 | ±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 | 320410 | ≥195 | ≥25 |
360 | 360480 | ≥215 | ≥24 | |
410 | 410530 | ≥235 | ≥22 | |
460 | 460580 | ≥265 | ≥21 | |
490 | 490610 | ≥285 | ≥21 |
Chemical compisition:
Standard code | Models of steel tubes | Chemical compisition() | ||||
C | Si | Mn | P | S | ||
GB/T5312 | 320 | ≤0.16 | ≤0.35 | 0.400.70 | ≤0.035 | ≤0.035 |
360 | ≤0.17 | ≤0.35 | 0.400.80 | ≤0.035 | ≤0.035 | |
410 | ≤0.21 | ≤0.35 | 0.401.20 | ≤0.035 | ≤0.035 | |
460 | ≤0.22 | ≤0.35 | 0.801.40 | ≤0.035 | ≤0.030 | |
490 | ≤0.23 | ≤0.35 | 0.801.50 | ≤0.035 | ≤0.030 | |
Note:
residual elements:Cr≤0.25,Mo≤0.10,Ni≤0.30,Cu≤0.30aggregate≤0.70
