GB 18248 37Mn 30CrMo Large Diameter Steel Pipe Seamless For Gas Cylinder
Seamless Steel Tubes for Gas Cylinder GB 18248 37Mn 30CrMo
SPEC:
Material:37Mn 30CrMo 34CrMo4 35CrMo
Diameter : 4-1200mm
Wall thickness : 0.3-200mm
Length : 4-6m Upon customer's request
Production method: Hot rolling(extrusion), cold drawn, cold rolled
Delivery condition: BK,GBK,NBK
Chemical composition of Seamless Steel Tube for GasCylinder:
| Steel Grade | Chemical composition | ||||||||||
| C | Si | Mn | P | S | P+S | Cr | Mo | V | Ni | Cu | |
| 37Mn | 0.34-0.40 | 0.10-0.30 | 1.35-1.65 | ≤0.030 | ≤0.030 | ≤0.055 | ≤0.30 | / | / | ≤0.30 | ≤0.20 |
| 34Mn2V | 0.30-0.37 | 0.17-0.37 | 1.40-1.75 | ≤0.030 | ≤0.030 | ≤0.055 | ≤0.30 | / | 0.07-0.12 | ≤0.30 | ≤0.20 |
| 30CrMo | 0.26-0.34 | 0.17-0.37 | 0.40-0.70 | ≤0.030 | ≤0.030 | ≤0.055 | 0.80-1.10 | 0.15-0.25 | / | ≤0.30 | ≤0.20 |
| 35CrMo | 0.32-0.40 | 0.17-0.37 | 0.40-0.70 | ≤0.030 | ≤0.030 | ≤0.055 | 0.80-1.10 | 0.15-0.25 | / | ≤0.30 | ≤0.20 |
Seamless steel pipes Mechanical Properties :
| Steel Grade |
Tensile Strength MPa |
Yield Strength MPa |
Elongation % |
| 37Mn | ≥750 | ≥630 | ≥16 |
| 34Mn2V | ≥745 | ≥530 | ≥16 |
| 30CrMo | ≥930 | ≥785 | ≥12 |
| 35CrMo | ≥980 | ≥835 | ≥12 |
Tolerance of seamless gas cylinder steel pipe:
1. Tolerance of the OD,WT:
| Production Method | Tolerance for OD & WT % | |
| Tolerance for OD | Tolerance for WT | |
| Hot rolling Tube | ±1.0 |
+12.5 -10 |
| Cold Drawn (Cold Rolled) Tube | ±0.75 |
+12.5 -10 |
Widely used in the field of: for Gas Cylinder Applications, Oil Cylinders/Telescopic Cylinders, mechanical and general engineering purposes.
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