GB 18248 37Mn Seamless Steel Tubes for Gas Cylinder, JIS G3429, EN 10297-1, ASTM A372, EN 1964-1, EN ISO 11120, ISO 11439, ISO 9809-1, JIS B8230, JIS B8241, 37Mn (STH 11, STH 12, 38Mn6, SA372C), 34Mn2V (STH 11, STH 12, 30CrMo (STH 21, ISO 11120 Group II, 30CrMo4, SA372E, 4130X), 35CrMo (STH 22, ISO 11120 Group II, 34CrMo4), 34CrMo4 (STH 22, ISO 11120 Group II, 34CrMo4), 30CrMnSiA

GB 18248 Seamless Steel Tubes for Gas Cylinder

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

Material: 37Mn
Equivalent Materials: STH 11, STH 12, 38Mn6, SA372C

Chemistry 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)

Outside Diameter & Tolerance

Hot Rolled	Outside Diameter, mm	Tolerance
	OD≤159	+1% or +0.50mm
	OD>159
Cold Drawn	Outside Diameter, mm	Tolerance
		Ordinary	Advanced
	OD≤30	±0.20mm	±0.15mm
	30＜OD≤50	±0.30mm	±0.25mm
	OD>50	±0.50%	±0.50%

Wall thickness & Tolerance

Hot Rolled	Outside 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	Tolerance
		Ordinary	Advanced
	WT≤2.0	+12.5%/-10%	±10%
	WT>2.0	±10%	±7.5%

GB 18248 specifies the size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of seamless steel pipes for gas cylinders and accumulator housings. GB 18248 is suitable for manufacturing seamless steel pipes for gas cylinders and accumulator housings.
GB 18248规定了气瓶用和蓄能器壳体用无缝钢管的尺寸、外形、重量、技术要求、试验方法、检验规则、包装、标志和质量证明书。GB 18248适用于制造气瓶和蓄能器壳体用无缝钢管。

Manufacture: tubes to GB/T 6479 shall be manufactured by hot rolled or cold drawn.
Heat Treatment: the tubes shall be produced by heat treated, WT≤30mm normalizing & tempering, WT>30mm quenching & tempering or normalizing & tempering.
Inspection & Test: chemistry composition analysis, tension test, flattening test, flaring test, impact test, macroscopic examination, non-metallic inclusions, NDT, surface inspection and dimension check.

Length: 4000mm; 6000mm; 9000mm; 12000mm; and so on.
Max developed length: 30 meters, also U bending, finning, studded process can be provided.
Option: shot blasting on the outside surface to remove mill scale, make the surface matte colour; surface polishing as preparation work done for further processing, for instance finning.

Keyword: GB/T 6479, High Pressure Steel Pipe, High Pressure Chemical Fertilizer Steel Tube, Pipeline, Piping

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