GB 28883 10 Composite Seamless Steel Tubes for Pressure, 10, 20G, 20MnG, 16Mn, 15MoG, 12CrMoG, 15CrMoG, 12Cr1MoVG, 07Cr19Ni10, 022Cr19Ni10, 022Cr17Ni12Mo2, 022Cr22Ni5Mo3N, NS1402, NS3102

GB 28883 Composite Seamless Steel Tubes for Pressure

Standard: GB 28883

Material: 10

Chemistry Composition

C, %	Si, %	Mn, %	P, %	S, %	Cu, %	Cr, %	Ni, %	Mo, %	V, %
0.22-0.27	0.17-0.37	0.70-1.00	0.025 max	0.015 max	0.20 max	0.25 max	0.25 max	0.15 max	0.08 max

Mechanical Properties

Tensile Strength , MPa	Yield Strength, MPa	Elongation, %	Impact (KV2)/J	Hardness
485-640	275 min	20 min	40 (OD≥76mm & WT≥14mm)	HBW 130-180	HV 130-180

Outside Diameter & Tolerance

Hot Rolled	Outside Diameter, mm	Tolerance
	Outside Diameter, mm	Ordinary	Advanced
	OD＜57	±0.40mm	±0.30mm
	57≤OD≤325, WT≤35	±0.75%	±0.50%
	57≤OD≤325, WT>35	±1%	±0.75%
	325＜OD≤600	+1% or +5mm	-
	OD>600	+1% or +7mm	-
Cold Drawn	Outside Diameter, mm	Tolerance
	OD≤25.4	±0.15mm	-
	25.4＜OD≤40	±0.20mm	-
	40＜OD≤50	±0.25mm	-
	50＜OD≤60	±0.30mm	-
	OD>60	±0.50%	-

Wall thickness & Tolerance

Hot Rolled	Wall Thickness, mm	Tolerance
	Wall Thickness, mm	Ordinary	Advanced
	WT≤4.0	±0.45mm	±0.35mm
	4＜OD≤20	+12.5%/-10%	±10%
	WT>20, OD＜219	±10%	±7.5%
	WT>20, OD≥219	+12.5%/-10%	±10%
Cold Drawn	Wall Thickness, mm	Tolerance
	Wall Thickness, mm	Ordinary	Advanced
	WT≤3.0	±0.30mm	±0.20mm
	WT>3	±10%	±7.5%

GB 28883 specifies the size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of composite seamless steel pipes for pressure. GB 28883 is applicable to the manufacture of composite seamless steel pipes for pressure applications such as boilers, pressure vessels and pressure piping.
GB 28883规定了承压用复合无缝钢管的尺寸、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 28883适用于制造锅炉、压力容器和压力管道等承压用复合无缝钢管。

Manufacture: tubes to GB/T 5310 shall be manufactured by hot rolled or cold drawn.
Heat Treatment: the tubes shall be produced by heat treated as normalizing.
Inspection & Test: chemistry composition analysis, tension test, flattening test or bending test, flaring test, hardness test, impact test, grain size grade, decarburized layer of both inside & outside, macroscopic examination, non-metallic inclusions, microstructure, 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 5310, High Pressure Steel Pipe, Boiler Steel Pipe, Steam Boiler Pipe, Pipeline, Piping

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