Carbon Steel Pipes, Alloy Steel Pipes, GOST 550-75 10, GOST 550-75 10G2 10Mn2, GOST 550-75 20, GOST 550-75 12ChM 12CrMo, GOST 550-75 15Ch5M 15X5M 15Cr5Mo T5, SA213 T5, SA335 P5, Seamless Steel Pipes, Seamless Steel Tubes

GOST 550-75 Seamless steel tubes for petroleum processing and the petrochemical industry

Standard: GOST 550-75
Equivalent Standard: DIN 17175, EN 10216-2, ASTM A213, ASTM A335, ASME SA213, GB9948

Material: 20
Equivalent Materials: St44, St45.8, 1020, 410

Chemistry Composition

C, %	Si, %	Mn, %	P, %	S, %	Cr, %	Ni, %	Cu, %
0.17-0.24	0.17-0.37	0.35-0.65	0.040 max	0.035 max	0.25 max	0.30 max	0.30 max

Mechanical Properties

Type	Tensile Strength , MPa	Yield Strength, MPa	Elongation, %	Hardness, HB
Hot rolled	431 min	255 min	22 min	156 max
Cold & Warm	412 min	245 min	23 min	156 max

Outside Diameter & Tolerance

Group A	Cold & Warm	Material	Outside Diameter, mm	Tolerance, mm
		10, 20	OD＜57	GOST 9567-75
		Alloy Steel Pipes	OD＜30	±0.20
		Alloy Steel Pipes	30≤OD＜57	±0.30
	Hot rolled	Material	Outside Diameter, mm	Tolerance, mm
	Hot rolled	All	OD≥57	+0.5%/-1.25%

Group B	Outside Diameter , mm	Tolerance, mm
	Outside Diameter , mm	Normal	High	Higher
	OD≤50	±0.50	±0.50	GOST 8734-75
	50＜OD≤219	±1.0%	±0.8%	GOST 8734-75
	OD>219	±1.25%	±1.0%	GOST 8734-75

Wall thickness & Tolerance

Group A	Cold & Warm	Wall Thickness, mm	Tolerance, %
	Cold & Warm	All	±8
	Hot rolled	Wall Thickness, mm	Tolerance, %
		WT≤15	±12.5
		WT>15	±10

Group B	Outside Diameter, mm	Tolerance, %
	Outside Diameter, mm	Normal	High	Higher
	WT≤15, OD≤219	+12.5/-15.0	±12.5	GOST 8734-75
	15＜WT＜30, OD≤219	±12.5	+10.0/-12.5	GOST 8734-75
	WT≥30, OD≤219	+10.0/-12.5	±10	GOST 8734-75
	WT≤15, OD>219	+12.5/-15.0	+12.5/-15.0	GOST 8734-75
	15＜WT＜30, OD>219	±12.5	±12.5	GOST 8734-75
	WT≤15, OD>219	+10.0/-12.5	+10.0/-12.5	GOST 8734-75

GOST 550-75 shall be applied to steel pipes designed for petroleum processing and the petrochemical industry. Depending on their purpose, pipes shall be manufactured in groups A and B. The dimensions of cold worked, warm worked and hot worked pipes of group A shall be in accordance with those specified in table 1 of GOST 550-75, dimensions of cold worked and warm worked pipes of group B shall be in accordance with GOST 8734-75, and the dimensions of hot worked pipes of group B shall be in accordance with GOST 8732-78. The pipes of group A shall be manufactured with a length of cut in compliance with table 1 of GOST 550-75, and a minimum length not less than 4 m.

Length: 4000mm; 8030mm; 8050mm; 12010mm; 12030mm; 12050mm; and so on.
Max length: 27000mm, also U bending can be offered.

Keyword: seamless steel pipe, seamless steel tube, ГОСТ 550-75, GOST 550-75

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