Yosun (Tianjin) Piping Engineering Co., Ltd. is one of the most credible manufacturers and suppliers of marine carbon steel seamless steel pipe in China. Please feel free to wholesale customized marine carbon steel seamless steel pipe at competitive price from our factory. If you have any enquiry about quotation, please feel free to email us.
Classification society
China Classification Society Materials and Welding Specifications - China Classification Society (CCS)
DNV Specifications - Norwegian Classification Society (DNV)
LR Specifications - British Lloyd's Register of Shipping (LR)
GL Specifications - German Lloyd's Register of Shipping (GL)
ABS Specifications - American Bureau of Shipping (ABS)
BV Specifications - French Bureau Veritas (BV)
RINA Specifications - Italian Registro Italiano Navale (RINA)
NK Specifications - Japanese Classification Society (NK)
Mechanical Property
|
Standard |
Brand |
Tensile strength (MPa) |
Yield strength (MPa) |
Elongation (%) |
|
GB/T 5312 |
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 |
Production Process
The production process of carbon steel seamless steel tubes for ships mainly includes the following steps:
1. Smelting: Steel is smelted in electric furnaces or converter furnaces, with the addition of suitable alloying elements to ensure that the chemical composition of the steel meets the required specifications.
2. Continuous casting: Steel is poured into a continuous casting machine and solidified to form billets.
3. Rolling: Billets are sent through rolling mills to form round pipes of a certain diameter and thickness.
4. Seamless welding: Advanced welding techniques are used to weld the ends of the round pipes to form a closed tube.
5. Heat treatment: High-temperature annealing or quenching and annealing are carried out to improve the mechanical properties and corrosion resistance of the steel.
6. Finishing: The steel pipes are subjected to surface grinding, straightening, and ultrasonic testing to ensure the quality and precision of the product.
7. Inspection: The finished steel pipes are inspected for dimensions, appearance, chemical composition, and mechanical properties to ensure that they meet the required specifications.
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