YB/T 4173 20G Forged and Bored Seamless Steel Pipes with Heavy Wall for High-temperature Service, ASTM A106/A106M, ASTM A335/A335M, ASTM A369/A369M, EN 10216-2, 20G, 20MnG, 25MnG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12Cr1MoVG, 07Cr2MoW2VNbB, 15Ni1MnMoNbCu, 10Cr9Mo1VNbN, 10Cr9MoW2VNbBN, 10Cr11MoW2VNbCuBN, 11Cr9Mo1W1VNbBN

YB/T 4173 Forged and Bored Seamless Steel Pipes with Heavy Wall for High-temperature Service

Standard: YB/T 4173
Equivalent Standards: ASTM A106/A106M, ASTM A335/A335M, ASTM A369/A369M, EN 10216-2

Material: 20G
Equivalent Materials: P265GH, 1.0425, 0.25C

Chemistry Composition

C, %	Si, %	Mn, %	P, %	S, %	Cu, %	Cr, %	Ni, %	Mo, %	V, %
0.17-0.23	0.17-0.37	0.35-0.65	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
410-550	245 min	24 min	40 (OD≥76mm & WT≥14mm)	HBW 120-160	HV 120-160

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%

YB/T 4173 specifies the size, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of forged and bored seamless steel pipes with heavy wall for high temperature service. YB/T 4173 is suitable for the manufacture of seamless steel pipes for steam boilers and pipelines with high pressure and higher.
YB/T 4173规定了高温用锻造镗孔厚壁无缝钢管的尺寸、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。YB/T 4173适用于制造高压及其以上压力的蒸汽锅炉、管道用无缝钢管。

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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