GOST 8734-75 40Ch, 40Cr, Seamless Cold-formed Steel Pipes, Carbon Steel Pipes, Alloy Steel Pipes, Heat Exchanger Tubes, Heat Exchanger Steel Tubes, GOST 8734-75 10 St35.8, GOST 8734-75 10G2 10Mn2, GOST 8734-75 20 St45.8, GOST 8734-75 35, GOST 8734-75 45, GOST 8734-75 15ChM 15CrMo, GOST 8734-75 20Ch 20Cr, GOST 8734-75 40Ch 40Cr, Seamless Steel Pipes

GOST 8734-75 Seamless cold-formed steel pipes

Standard: GOST 8734-75
Equivalent Standards: DIN 1629, EN 10216-1

Material: 40Ch
Equivalent Materials: 40Cr

Chemistry Composition

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

Mechanical Properties

Tensile Strength , MPa	Yield Strength, MPa	Elongation, %
618 min	-	14 min

Outside Diameter & Tolerance

Outside Diameter, mm	Tolerance, mm
5≤OD≤10	±0.15
10＜OD≤30	±0.30
30＜OD≤50	±0.40
OD>50	±0.8%

Wall thickness & Tolerance

Wall Thickness , mm	Tolerance, %
WT≤1	±0.12mm
1＜WT≤5	±10
WT>5	±8
1＜WT≤2.5, OD>110	±12.5

Length: 4000mm; 8030mm; 8050mm; 12010mm; 12030mm; 12050mm; 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: seamless steel pipe, seamless steel tube, GOST 8734-75, DIN 1629, EN 10216-1, ГОСТ 8734-75

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