GB 24512.2 HD12Cr2Mo Seamless Steel Tubes and Pipes for Nuclear Power Plant - Part 2: Alloy Steel Seamless Tubes and Pipes, EN 10216-2, ASTM A213/A213M, ASTM A335/A335M, GB/T 5310, NF A49-213, HD12Cr2Mo (12Cr2Mo2G, 10CrMo9-10, TU 10 CD 9-10, T22, P22), HD15Ni1MnMoNbCu (15Ni1MnMoNbCu, 15NiCuMoNb5-6-4, T36)

GB 24512.2 Seamless Steel Tubes and Pipes for Nuclear Power Plant - Part 2: Alloy Steel Seamless Tubes and Pipes

Standard: GB 24512.2
Equivalent Standards: EN 10216-2, ASTM A213/A213M, ASTM A335/A335M, GB/T 5310, NF A49-213

Material: HD12Cr2Mo
Equivalent Materials: 12Cr2Mo2G, 10CrMo9-10, TU 10 CD 9-10, T22, P22, 1.7380

Chemistry Composition

Grade	C	Si	Mn	P	S	Cr	Ni
HD12Cr2Mo	0.08%-0.15%	0.50% max	0.40%-0.70%	0.025% max	0.015% max	2.00%-2.50%	0.30% max
HD15Ni1MnMoNbCu	0.10%-0.17%	0.25%-0.50%	0.80%-1.20%	0.025% max	0.015% max	0.15%-0.30%	1.00%-1.30%
Grade	Cu	Al	Mo	V	N	Nb
HD12Cr2Mo	0.20% max	-	0.90%-1.20%	0.08% max	-	-
HD15Ni1MnMoNbCu	0.50%-0.80%	0.05% max	0.25%-0.40%	0.02% max	0.02% max	0.015%-0.025%

Mechanical Properties

Grade	Tensile Strength , MPa	Yield Strength, MPa	Elongation, %
HD12Cr2Mo	450-600	280 min	22 min
HD15Ni1MnMoNbCu	620-780	440 min	19 min

Outside Diameter & Tolerance

Hot Rolled	Outside Diameter, mm	Tolerance
	Outside Diameter, mm	Normal	Advance
	OD≤54	±0.40mm	±0.30mm
	OD＞54	±1%	±0.75%
Hot Expansion	Outside Diameter, mm	Tolerance
	Outside Diameter, mm	Normal	Advance
	OD, All	±1%	±0.75%
Cold Drawn	Outside Diameter, mm	Tolerance
	Outside Diameter, mm	Normal	Advance
	OD≤25.4	±0.15mm	-
	25.4＜OD≤40	±0.20mm	-
	40＜OD≤50	±0.25mm	-
	50＜OD≤60	±0.30mm	-
	OD＞60	±0.5%	-

Wall thickness & Tolerance

Hot Rolled	Wall Thickness, mm	Tolerance
	Wall Thickness, mm	Normal	Advance
	AWT≤4	±0.45mm	±0.35mm
	4＜AWT≤20	+12.5%/-10%	±10%
	AWT＞20, OD＜219	±10%	±7.5%
	AWT＞20, OD≥219	+12.5%/-10%	±10%
Hot Expansion	Wall Thickness, mm	Tolerance
	Wall Thickness, mm	Normal	Advance
	AWT, All	+18%/-10%	+12.5%/-10%
Cold Drawn	Wall Thickness, mm	Tolerance
	Wall Thickness, mm	Normal	Advance
	AWT≤3	±0.30mm	±0.20mm
	AWT＞3	±10%	±7.5%
Hot Rolled	Wall Thickness, mm	Tolerance
	Wall Thickness, mm	Normal	Advance
	MWT≤4	+0.90mm/-0mm	+0.70mm/-0mm
	MWT＞4	+25%/-0%	+22%/-0%
Cold Drawn	Wall Thickness, mm	Tolerance
	Wall Thickness, mm	Normal	Advance
	MWT≤3	+0.60mm/-0mm	+0.40mm/-0mm
	MWT＞3	+20%/-0%	+15%/-0%

GB 24512.2 specifies the classification, code, size, shape, weight and allowable deviations, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of alloy steel seamless steel pipes for nuclear power plants. GB 24512.2 is suitable for the manufacture of alloy steel seamless steel tubes for pressure-bearing parts of non-nuclear-grade equipment in nuclear power plants.
GB 24512.2规定了核电站用合金钢无缝钢管的分类、代号、尺寸、外形、重量及允许偏差、技术要求、试验方法、检验规则、包装、标志和质量证明书。GB 24512.2适用于制造核电站非核级设备承压部件用合金钢无缝钢管。

Manufacture: tubes to EN 10216-2 shall be manufactured by hot formed or cold finished.
Heat Treatment: the tubes shall be supplied in normalising + tempering delivery condition.
Inspection & Test: chemistry composition analysis, tensile test, flattening test, flaring test, NDT, surface inspection and dimension check.

Length: 5800mm; 6000mm; 6096mm; 7315mm; 11800mm; 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: EN 10216-2, DIN 17175, High Pressure Steel Pipes, Boiler Steel Pipes

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