GB 150.2 08Cr2AlMo Carbon steel tubes, alloy steel tubes and stainless steel tubes used for pressure vessels Part 2: Materials, 12Cr2Mo1, 09MnD, 09MnNiD, 08Cr2AlMo, 09CrCuSb

GB 150.2 Carbon steel tubes, alloy steel tubes and stainless steel tubes used for pressure vessels Part 2: Materials

Standard: GB 150.2

Material: 08Cr2AlMo

Chemistry Composition

C, %	Si, %	Mn, %	P, %	S, %	Cr, %	Al, %	Mo, %
0.05-0.10	0.15-0.40	0.20-0.50	0.025 max	0.015 max	2.00-2.50	0.30-0.70	0.30-0.40

Mechanical Properties

Tensile Strength , MPa	Yield Strength, MPa	Elongation, %
400-540	250 min	25 min

Outside Diameter & Tolerance

Hot Rolled	Outside Diameter, mm	Tolerance
	Outside Diameter, mm	Ordinary	Advanced
	OD≤54	±0.50mm	±0.30mm
	54＜OD≤325	±1%	±0.75%
	OD>325	±1%	-
Cold Drawn	Outside Diameter, mm	Tolerance
	Outside Diameter, mm	Ordinary	Advanced
	OD≤25.4	±0.15mm	-
	25.4＜OD≤40	±0.20mm	-
	40＜OD≤50	±0.25mm	-
	50＜OD≤60	±0.30mm	-
	OD>60	±0.75%	±0.50%

Wall thickness & Tolerance

Hot Rolled	Wall Thickness, mm	Tolerance
	Wall Thickness, mm	Ordinary	Advanced
	WT≤20	+15%/-10%	±10%
	WT>20	+12.5%/-10%	±10%
Cold Drawn	Wall Thickness, mm	Tolerance
	Wall Thickness, mm	Ordinary	Advanced
	WT≤3	±0.30mm	±0.20mm
	WT>3	±10%	±7.5%

GB 150.2 is applicable to steel tubes for pressure vessels with design temperature of -253℃ to 800℃ and design pressure of not more than 35MPa.

Manufacture: tubes to GB 150.2 shall be manufactured by hot rolled or cold drawn.
Heat Treatment: the tubes shall be produced by heat treated as normalizing & tempering.
Inspection & Test: chemistry composition analysis, tension test, flattening test or bending test, flaring test, hardness test (alloy & stainless), impact test, macroscopic examination, non-metallic inclusions, microstructure, intergranular corrosion test (stainless), 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 150.2, Air preheater Steel Tubes, Heat Exchanger Steel Tubes, Furnace Tubes

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