Second hand goods
Seamless steel pipe for ship building usage |
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%
Good deal: buying from seller
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