GB 18248 gas cylinder tube

GB 18248 gas cylinder tube

GB 18248 Gas Cylinder Tube

The GB 18248 standard is specifically designed for the production of seamless steel pipes used in gas cylinders and accumulator shells. It primarily provides high-quality materials such as 37Mn, 30CrMo, 35CrMo, and 34CrMo4 seamless steel pipes, which are widely used in oil piping systems and other industrial applications.

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

Available Brands: 37Mn, 34Mn2V, 30CrMo, 35CrMo, 34CrMo4, 30CrMnSiA
Outer Diameter: 48 - 711 mm
Wall Thickness: 3.1 - 38 mm
Length: 4 - 12 m
Delivery Condition: As rolled, quenched and tempered, normalized and tempered, or not heat treated

GB 18248 outlines the dimensions, shape, weight, technical specifications, testing methods, inspection rules, packaging, marking, and quality certification for seamless steel pipes used in gas cylinders and accumulator shells. This standard ensures that the manufactured pipes meet rigorous performance and safety requirements, making them ideal for use in high-pressure environments.

Manufacturing Process: Pipes complying with GB/T 6479 are typically produced through hot rolling or cold drawing, depending on the desired mechanical properties and application needs.
Heat Treatment: For wall thickness less than or equal to 30 mm, normalizing followed by tempering is recommended. For thicker sections, quenching and tempering or normalization and tempering may be applied to achieve the required strength and toughness.
Inspection and Testing: Comprehensive testing includes chemical composition analysis, tensile testing, flattening test, expansion test, impact test, macroscopic inspection, non-metallic inclusion evaluation, non-destructive testing, surface inspection, and dimensional checks.

Standard Lengths: 4000mm, 6000mm, 9000mm, 12000mm, etc.
Maximum Unfolded Length: Up to 30 meters. Additional processes such as U-bending, finning, and nailing are also available upon request.
Surface Options: External shot blasting to remove scale and create a matte finish, or 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℃
450–600
280 min
20 min
40 (OD≥76mm & WT≥6.5mm)
Outer Diameter & Tolerance
Hot Rolled
Outer Diameter, mm
Tolerance
OD≤159
+1% or +0.50mm
OD>159
Cold Drawn
Outer Diameter, mm
Ordinary
Advanced
OD≤30
±0.20mm
30
±0.30mm
±0.25mm
OD>50
±0.50%
±0.50%
Wall Thickness & Tolerance
Hot Rolled
Outer Diameter, mm
Tolerance
OD≤159
+12.5%/–10% or +0.50mm/–0.40mm
OD>159, WT/OD≤0.05
+15%/–10%
OD>159, 0.05
+12.5%/–10%
OD>159, WT/OD>0.10
±10%
Cold Drawn
Wall Thickness, mm
Ordinary
Advanced
WT≤2.0
+12.5%/–10%
±10%
WT>2.0
±10%
±7.5%

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