GB 24512.1 HD245 Seamless Steel Tubes and Pipes for Nuclear Power Plant - Part 1: Carbon Steel Seamless Tubes and Pipes, EN 10216-2, ASTM A106/A106M, ASTM A210/A210M, HD245 (20G, 20MnG, P235GH, TU 42C, TU E250, SA106B, SA210A1), HD245Cr (TU 42CR), HD265 (P265GH), HD265Cr, HD280 (25MnG, TU 48C, SA106C, SA210C), HD280Cr (TU 48CR)

GB 24512.1 Seamless Steel Tubes and Pipes for Nuclear Power Plant - Part 1: Carbon Steel Seamless Tubes and Pipes

Standard: GB 24512.1
Equivalent Standard: EN 10216-2, ASTM A106/A106M, ASTM A210/A210M, GB/T 5310, NF A49-213, NF A49-211

Material: HD245

Chemistry Composition

C, %	Mn, %	P, %	S, %
0.30 max	0.40-1.06	0.025 max	0.025 max

Mechanical Properties

Tensile Strength , MPa	Yield Strength, MPa	Elongation, %	Hardness, HB
380 min	205 min	35 min	163 max

Outside Diameter & Tolerance

Hot rolled	Outside Diameter, mm	Tolerance, mm
	OD≤101.6	+0.4/-0.8
	101.6＜OD≤190.5	+0.4/-1.2
	190.5＜OD≤228.6	+0.4/-1.6
Cold Drawn	Outside Diameter , mm	Tolerance, mm
	OD＜25.4	±0.10
	25.4≤OD≤38.1	±0.15
	38.1＜OD＜50.8	±0.20
	50.8≤OD＜63.5	±0.25
	63.5≤OD＜76.2	±0.30
	76.2≤OD≤101.6	±0.38
	101.6＜OD≤190.5	+0.38/-0.64
	190.5＜OD≤228.6	+0.38/-1.14

Wall thickness & Tolerance

Hot rolled	Outside Diameter , mm	Tolerance, %
	OD≤101.6, WT≤2.4	+40/-0
	OD≤101.6, 2.4＜WT≤3.8	+35/-0
	OD≤101.6, 3.8＜WT≤4.6	+33/-0
	OD≤101.6, WT>4.6	+28/-0
	OD>101.6, 2.4＜WT≤3.8	+35/-0
	OD>101.6, 3.8＜WT≤4.6	+33/-0
	OD>101.6, WT>4.6	+28/-0
Cold Drawn	Outside Diameter , mm	Tolerance, %
	OD≤38.1	+20/-0
	OD>38.1	+22/-0

ASTM A334/A334M specification covers several grades of minimum wall-thickness, seamless and welded, carbon and alloy-steel tubes intended for use at low temperatures. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse affect on low-temperature impact properties.

Manufacture: the tubes shall be made by the seamless process and shall be either hot-finished or cold-finished, as specified.
Heat Treatment: all seamless tubes shall be treated to control their microstructure in accordance with one of the following methods:
a: Normalize by heating to a uniform temperature of not less than 1550 °F [845 °C] and cool in air or in the cooling chamber of an atmosphere controlled furnace.
b: Reheat and control hot working and the temperature of the hot-finishing operation to a finishing temperature range from 1550 to 1750 °F [845 to 955°C] and cool in a controlled atmosphere furnace from an initial temperature of not less than 1550 °F [845 °C].
Inspection & Test: chemistry composition analysis, tension test, flattening test, flaring test, hardness test, impact test, NDT, surface inspection and dimension check.

Length: 5800mm; 6000mm; 6096mm; 7315mm; 11800mm; and so on.
Max length: 30000mm, also U bending can be offered.

Keyword: seamless steel pipe, seamless steel tube, low carbon steel tube, ASTM A334, ASME SA334

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