GB 18248 gas cylinder tube

GB 18248 gas cylinder tube

GB 18248 Gas Cylinder Tube

The GB 18248 standard is designed for the production of seamless steel pipes used in gas cylinders and accumulator shells. It primarily supplies high-quality tubes such as 37Mn, 30CrMo, 35CrMo, and 34CrMo4, which are widely used in oil and gas applications due to their excellent mechanical properties and durability.

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, quenched and tempered, normalized and tempered

GB 18248 defines the dimensions, shape, weight, technical specifications, testing methods, inspection rules, packaging, marking, and quality certificates for seamless steel pipes used in gas cylinders and accumulators. This standard ensures that the pipes meet strict requirements for safety and performance in high-pressure environments.

Manufacturing Process: Pipes conforming to GB/T 6479 are typically produced through hot rolling or cold drawing, depending on the required precision and application. Heat treatment is essential for enhancing the mechanical properties of the material. For wall thickness (WT) ≤ 30 mm, normalization followed by tempering is recommended. For WT > 30 mm, quenching and tempering or normalization and tempering is applied.

Inspection and Testing: Comprehensive testing includes chemical composition analysis, tensile testing, flattening test, expansion test, impact testing, macroscopic inspection, non-metallic inclusion assessment, non-destructive testing (NDT), surface inspection, and dimensional checks. These tests ensure that the product meets all required quality standards before delivery.

Standard Lengths: 4000mm, 6000mm, 9000mm, 12000mm, etc.
Maximum Unfolded Length: Up to 30 meters. Additional processes like U-bending, finning, and nailing are available upon request.

Surface Options: External shot blasting to remove scale and achieve a matte finish, or surface polishing for further processing such as 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 and 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 < OD ≤ 50
±0.30mm
OD > 50
±0.50%
Wall Thickness and 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 < WT/OD ≤ 0.10
+12.5%/-10%
OD > 159, WT/OD > 0.10
±10%
Cold Drawn
Wall Thickness, mm
Ordinary
Advanced
WT ≤ 2.0
+12.5%/-10%
WT > 2.0
±10%

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