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GOST 550-75 Seamless steel tubes for petroleum processing and the petrochemical industry |
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Standard: GOST 550-75
Equivalent Standard: DIN 17175, EN 10216-2, ASTM A213, ASTM A335, ASME SA213, GB9948 |
Material: 10G2 |
Chemistry Composition |
C, % |
Si, % |
Mn, % |
P, % |
S, % |
Cr, % |
Cu, % |
Ni, % |
0.07-0.15 |
0.17-0.37 |
1.2-1.6 |
0.035 max |
0.035 max |
0.30 max |
0.30 max |
0.30 max |
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Mechanical Properties |
Tensile Strength , MPa |
Yield Strength, MPa |
Elongation, % |
Hardness, HB |
421 min |
265 min |
21 min |
197 max |
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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 |
30≤OD<57 |
±0.30 |
Hot rolled |
Material |
Outside Diameter, mm |
Tolerance, mm |
All |
OD≥57 |
+0.5%/-1.25% |
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Group B |
Outside Diameter , mm |
Tolerance, 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 |
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Wall thickness & Tolerance |
Group A |
Cold & Warm |
Wall Thickness, mm |
Tolerance, % |
All |
±8 |
Hot rolled |
Wall Thickness, mm |
Tolerance, % |
WT≤15 |
±12.5 |
WT>15 |
±10 |
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Group B |
Outside Diameter, mm |
Tolerance, % |
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 |
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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: 18000mm, also U bending can be offered. |
Keyword: seamless steel pipe, seamless steel tube, ГОСТ 550-75, GOST 550-75 |
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