GOST 8732-78 40Ch 40Cr, Seamless Hot-worked Steel Pipes, Carbon Steel Pipes, Alloy Steel Pipes, GOST 8732-78 10 St35.8, GOST 8732-78 10G2 10Mn2, GOST 8732-78 20 St45.8, GOST 8732-78 35, GOST 8732-78 45, GOST 8732-78 15ChM, 15CrMo, GOST 8732-78 20Ch 20Cr, GOST 8732-78 30ChMA 30CrMo, GOST 8732-78 40Ch 40Cr, Hot Rolled Steel Pipes

GOST 8732-78 Seamless Hot-worked Steel Pipes

Standard: GOST 8732-78
Equivalent Standard: ASTM A106, ASTM A53, EN 10216-1, DIN 1629

Material: 40Ch
Equivalent Material: 40Cr

Chemistry Composition

C, %	Si, %	Mn, %	Cr, %	Ni, %	S, %	P, %	Cu, %
0.36-0.44	0.17-0.37	0.50-0.80	0.80-1.10	0.30 max	0.035 max	0.035 max	0.30 max

Mechanical Properties

Tensile Strength, MPa	Yield Strength, MPa	Elongation, %
657 min	-	9 min

Outside Diameter & Tolerance

Outside Diameter, mm	Tolerance
32≤OD≤50	±0.5mm
51≤OD≤219	±1%

Wall thickness & Tolerance

Wall Thickness, mm	Tolerance, %
3≤OD≤15	+12.5/-15
16≤OD≤30	±12.5
32≤OD≤45	+10/-12.5

GOST 8732-78 applies to hot-worked seamless steel pipes of general purpose, manufactured by outside diameter, wall thickness and length.

Manufacture: the tubes shall be manufactured by cold drawn and hot rolled.
Delivery Condition: heat treated.
Inspection & Test: chemical composition analysis, elongation test, hardness test, flattening test, bending test, flaring test, NDT, surface inspection and dimension check.

Length: 4000mm; 6000mm; 6500mm; 10000mm; 12010mm; 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: GOST 8732-78, Steel Pipe, Hot worked Steel Pipe, Seamless Steel Pipe

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