GB18248-2000 Seamless Gas Cylinder Steel Tube, Steel Grade37Mn 34Mn2V 35CrMo
Hot rolling/ cold drawn/ cold rolled Seamless Steel Tube for Gas Cylinder, produced according to GB18248-2000
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This tube is used for gas cylinder. The seamless gas cylinder steel tube is produced by hot rolling(extrusion), cold drawn, cold rolled, according to the Chinese standard GB18248-2000.
GB18248-2000, a standard applies to the production of hot rolling, cold drawn or cold rolled seamless steel tube used for gas cylinder.
Feature for seamless gas cylinder pipe: Hot rolling/ cold drawn/ cold rolled Seamless Steel Tube
Application of seamless gas cylinder tube: For Gas Cylinder
Produce method for seamless gas cylinder pipe: Hot rolling(extrusion), cold drawn, cold rolled
The seamless gas cylinder tube`s material/Steel grade: 37Mn, 34Mn2V, 30CrMo, 35CrMo and so on.
Chemical composition of Seamless Steel Tube for Gas Cylinder:
| 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 | +15 -10 |
| Cold Drawn (Cold Rolled) Tube | ±0.75 | +12.5 -10 |
2.Bending tolerance for seamless gas cylinder pipe:
Bending tolerance should be no more than 1.5mm/m
3. End shape of the gas cylinder tube:
Both ends of the pipe should be cut to a complete end surface perpendicular to the axis, and remove burrs
4.Delivery condition for the seamless gas cylinder tube:
Delivery condition for hot rolling tube should be hot rolling, and for cold drawn(cold rolled) tube should be normalized(+NBK) or annealed.
5. Ovality and uneven wall thickness
Ovality and uneven wall thickness for the steel tube should be no more than 80% of the OD and the wall thickness.
Reference Standard:
GB/T 222 Tolerance of chemical composition for the steel products.
GB/T 223.5 Chemical analysis method for steel and alloy steel. Reduced silicon molybdate spectrophotometric determination of acid-soluble Silicon Content.
GB/T 223.11 Chemical analysis method for steel and alloy steel. Determination of chromium content ammonium persulfate oxidation volumetric method.
GB/T 223.12 Chemical analysis method for steel and alloy steel. Spectrophotometric determination of chromium content diphenyl hydrazine - separation of sodium carbonate.
GB/T 223.14 Chemical analysis method for steel and alloy steel. Tantalum extraction reagent spectrophotometric determination of vanadium content.
GB/T 228-1987 Metallic materials at room temperature tensile test method
GB/T 229-1994 Metal Charpy pendulum impact test method
GB/T 241-1990 Metal pipe hydraulic test method
GB/T 2102-1988 Steel pipe acceptance, packing, marking and quality specifications
GB/T 5777-1996 Seamless steel tube ultrasonic flaw detection method
GB/T 17395 Seamless steel pipe size, shape, weight and allowable tolerance
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