GB 18248 gas cylinder tube

GB 18248 Gas Cylinder Tube

This standard is specifically designed for the production of seamless steel pipes used in gas cylinders and accumulator shells. It covers a range of materials such as 37Mn, 30CrMo, 35CrMo, and 34CrMo4, which are commonly used in high-pressure applications like oil pipes and hydraulic systems.

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 meters
Delivery Condition: As rolled, normalized and tempered, quenched and tempered

GB 18248 defines the dimensions, shape, weight, technical specifications, testing methods, inspection procedures, packaging, marking, and quality certificates for seamless steel pipes intended for gas cylinders and accumulators. This standard ensures that the tubes meet strict performance requirements under various operating conditions.

Manufacturing Process: Pipes conforming to GB/T 6479 are typically manufactured using hot rolling or cold drawing techniques. Heat treatment is essential, with normalization and tempering applied for wall thickness less than 30 mm, and quenching plus tempering for thicker sections.

Inspection and Testing: Comprehensive tests include chemical composition analysis, tensile testing, flattening test, expansion test, impact testing, macroscopic examination, non-metallic inclusion assessment, non-destructive testing, surface inspection, and dimensional checks. These ensure the material's integrity and suitability for demanding applications.

Standard Lengths: 4000mm, 6000mm, 9000mm, 12000mm, etc. Extended lengths up to 30 meters are also available. Additional processing options such as U-bending, finning, and nail insertion can be provided upon request.

Surface Options: External shot blasting to remove scale and achieve a matte finish, or surface polishing for further machining processes 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
Tolerance
Ordinary
Advanced
OD≤30
±0.20mm
±0.15mm
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
Tolerance
Ordinary
Advanced
WT≤2.0
+12.5%/-10%
±10%
WT>2.0
±10%
±7.5%

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