GB 18248 Gas Cylinder Steel Tubes
This standard applies to the production of seamless steel pipes used for gas cylinders and accumulator shells. Primarily, we offer 37Mn gas cylinder tubes, as well as 30CrMo, 35CrMo, and 34CrMo4 seamless steel pipes designed for use in gas cylinder oil lines.
Standard: GB 18248
Equivalent Standards: JIS G3429, EN 10297-1, ASTM A372, EN 1964-1, EN ISO 11120, ISO 11439, ISO 9809-1, JIS B8230, JIS B8241
Brands: 37Mn, 34Mn2V, 30CrMo, 35CrMo, 34CrMo4, 30CrMnSiA
Outer Diameter: 48 - 711 mm
Wall Thickness: 3.1 - 38 mm
Length: 4 - 12 m
Delivery Status: Not heat-treated, quenched and tempered, normalized + tempered
GB 18248 outlines the dimensions, shapes, weights, technical specifications, testing methods, inspection protocols, packaging, markings, and quality certifications for seamless steel pipes intended for gas cylinders and accumulator casings. This standard is ideal for the manufacturing of seamless steel pipes for gas cylinders and accumulator casings.
Manufacturing: Pipes per GB/T 6479 must be made via hot rolling or cold drawing.
Heat Treatment: Pipes should undergo heat treatment, with normalizing + tempering for WT ≤ 30 mm and quenching + tempering or normalizing + tempering for WT > 30 mm.
Inspection and Testing: Chemical composition analysis, tensile tests, flattening tests, expansion tests, impact tests, macroscopic inspections, non-metallic inclusion checks, non-destructive testing, surface inspections, and dimensional inspections are required.
Lengths: 4000mm; 6000mm; 9000mm; 12000mm; etc.
Maximum Unfolded Length: 30 meters. Options include U-bends, fins, and nailing processes.
Surface Treatments: Shot blasting to remove scale and achieve a matte finish; surface polishing for further processing like fin trimming.
Chemical Composition:
| C, % | Si, % | Mn, % | P, % | S, % | Cr, % | Ni, % | Cu, % | Mo, % |
|------|-------|-------|------|------|-------|-------|-------|-------|
| 0.08-0.15 | 0.50 max | 0.40-0.60 | 0.025 max | 0.015 max | 2.00-2.50 | 0.30 max | 0.20 max | 0.90-1.13 |
Mechanical Properties:
| Tensile Strength, MPa | Yield Strength, MPa | Elongation, % | Impact (KV2)/J at 20°C |
|-----------------------|--------------------|---------------|------------------------|
| 450-600 | 280 min | 20 min | 40 (OD≥76mm & WT≥6.5mm)|
Outer Diameter & Tolerance:
Hot Rolled:
- OD ≤ 159 mm: +1% or +0.50mm tolerance
- OD > 159 mm: +1% or +0.50mm tolerance
Cold Drawn:
- OD ≤ 30 mm: ±0.20mm tolerance
- 30 < OD ≤ 50 mm: ±0.30mm tolerance
- OD > 50 mm: ±0.50% tolerance
Wall Thickness & Tolerance:
Hot Rolled:
- OD ≤ 159 mm: +12.5%/-10% or +0.50mm/-0.40mm tolerance
- OD > 159 mm, WT/OD ≤ 0.05: +15%/-10% tolerance
- OD > 159 mm, 0.05 < WT/OD ≤ 0.10: +12.5%/-10% tolerance
- OD > 159 mm, WT/OD > 0.10: ±10% tolerance
Cold Drawn:
- WT ≤ 2.0 mm: +12.5%/-10% tolerance
- WT > 2.0 mm: ±10% tolerance
This comprehensive guide ensures that all aspects of the production process are covered, from raw material selection to final product delivery. If you have any specific requirements or questions about our products, feel free to reach out. We're committed to delivering high-quality seamless steel pipes tailored to your needs.
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