Marine pipes refer to the pressure pipe Grade I and II pressure resistant pipelines manufacturing ships and boiler and superheater carbon steel and carbon-manganese steel seamless pipes; boiler pipes are the seamless boiler pipes, mainly divided into medium and low-pressure boiler seamless pipe and high-pressure boiler seamless pipes. Since the production of special seamless tubes in 1993, the company has been developing new products to meet market requirements. It has sucessfully developed low, medium and high pressure boiler tubes, etc.
Mainsteel tube grade
360440 243 620-460 622-490
ChemicalComposition
|
Grade grade |
Chemical composition limits, % |
|||||||
|
C |
Si |
Mn |
P max |
S max |
Ni |
Cr |
Mo |
|
|
360 |
≤0.17 |
0.10-0.35 |
0.40-0.80 |
0.035 |
0.035 |
/ |
/ |
/ |
|
440 |
0.12-0.18 |
0.10-0.35 |
0.90-1.20 |
0.035 |
0.035 |
/ |
/ |
/ |
|
243 |
0.10-0.20 |
0.10-0.35 |
0.40-0.80 |
0.035 |
0.035 |
≤0.20 |
≤0.30 |
0.25-0.30 |
|
620-460 |
0.10-0.15 |
0.10-0.35 |
0.40-0.70 |
0.030 |
0.030 |
≤0.20 |
0.70-1.10 |
0.45-0.65 |
|
622-490 |
0.08-0.15 |
≤0.50 |
0.30-0.70 |
0.025 |
0.020 |
≤0.20 |
2.00-2.50 |
0.90-1.20 |
Mechanicalproperties
|
Grade grade |
Mechanical properties |
|
|||
|
Steel type |
Steel number |
Yield strength MPa Min. |
Tensile strength MPa |
Elongation % Min. |
|
|
Carbon |
360 |
235 |
360-510 |
24 |
|
|
Carbon manganese |
440 |
245 |
440-580 |
21 |
|
|
0.3%Mo |
243 |
275 |
480-630 |
22 |
|
|
1%Cr0.5%Mo |
620-460 |
180 |
460-610 |
22 |
|
|
2.25%Cr1%Mo |
622-490 |
275 |
490-640 |
20 |
|