GB 5310-2008 steam boiler tube

GB 5310-2008 Steam Boiler Tube

GB 5310- 2008 is a national standard specifies classification, code name, dimension, shape, weight, technical requirements, specimen, test methods, test rules, packaging, mark and quality certificate.

GB 5310- 2008 standard is applicable to seamless tubes for making steam boiler whose pressure is high or higher and seamless tubes used as pipelines.

High pressure boiler pipe is a boiler tubes are seamless steel pipe category. The method of manufacturing seamless pipes is the same, but there are strict requirements for steels used in manufacturing of tube. High pressure boiler tubes when used often in high temperature and high pressure conditions, under the action of the tube in the high temperature flue gas and water vapor will occur oxidation and corrosion. Steel pipe with high rupture strength, high resistance to oxidation corrosion and good organizational stability. High pressure boiler tube is mainly used to make high-pressure and ultra-high pressure boiler superheater tubes, reheater tubes, windpipe, main steam pipe.

Main Grade: 20G, 20MnG, 25MnG, 15MoG, 20MoG, 12CrMoG, 15CrMoG(T12/P12), 12CrMoG, 12Cr2MoWVTiB.

20MnG high pressure boiler pipe is a high manganese carbon carburizing steel, the hardenability, strength and plasticity than 20 steel cutting performance also improved, good low temperature impact toughness and weldability. Used to manufacture camshafts, gears, couplings, hinges, pin towbar, crankshaft bearing ring

Chemical Compositions(%) of GB 5310-2008:

Steel grade	C	Si	Mn	P	S	Cr	Mo	Cu	Ni	V	Al	W	Ti	Nb
20G	0.17-0.24	0.17-0.37	0.35-0.65	≤0.030	≤0.030	≤0.25	≤0.15	≤0.20	≤0.25	≤0.08
20MnG	0.17-0.24	0.17-0.37	0.70-1.00	≤0.030	≤0.030	≤0.25	≤0.15	≤0.20	≤0.25	≤0.08
25MnG	0.18-0.24	0.17-0.37	0.80-1.10	≤0.030	≤0.030	≤0.25	≤0.15	≤0.20	≤0.25	≤0.08
15CrMo	0.12-0.18	0.17-0.37	0.40-0.70	≤0.030	≤0.030	0.80-1.10	0.40-0.55	≤0.20	≤0.30
12Cr2MoG	0.08-0.15	≤0.50	0.40-0.70	≤0.030	≤0.030	2.00-2.50	0.90-1.20	≤0.20	≤0.30
12Cr1MoV	0.08-0.15	0.17-0.37	0.40-0.70	≤0.030	≤0.030	0.90-1.20	0.25-0.35	≤0.20	≤0.30	0.15-0.30
12Cr2MoWVTiB	0.08-0.15	0.45-0.75	0.45-0.65	≤0.030	≤0.030	1.60-2.10	0.50-0.65	≤0.20	≤0.30	0.28-0.42		0.30-0.55	0.08-0.15	0.002-0.008
10Cr9Mo1VNb	0.08-0.12	0.20-0.50	0.30-0.60	≤0.020	≤0.010	8.00-9.50	0.85-1.05	≤0.20	≤0.40	0.18-0.25	≤0.015			0.06-0.10

Mechanical Properties of GB5310-2008:

Steel Grade	Yield Strength (Mpa)	Tensile Strength (Mpa)	Elongation (%)
20G	410-550	245	24
20MnG	≥ 415	240	22
25MnG	≥ 485	275	20
15MoG	450-600	270	22
12CrMoG	410-560	205	21
12Cr2MoG	450-600	280	20
12Cr1MoVG	470-640	255	21
12Cr2MoWVTib	540-735	345	18
10Cr9Mo1VNb	≥585	≥415	≥20

The W.T. tolerance of GB5310-2008：

W.T. (S)		Tolerance of W.T.
<3.5		+15%(+0.48mm min)
		-10%(+0.32mm min)
3.5-20		+15%,-10%
>20	D<219	±10%
	D≥219	+12.5%,-10%

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