GOST 8734-78 Steel 20 Seamless Carbon Steel Tube St20 pipes

We are the professional manufacturer of GOST 8734-78 Steel 20 Seamless Carbon Steel Tube St20 pipes in China.

GOST 8734-78 is a  Russian standard that defines the specifications for cold-formed seamless steel pipes with precise dimensions. These pipes are widely used across industries such as construction, machinery, oil and gas, and power generation

Standard: GOST 8734-75 

The standard provides detailed specifications for outer diameters, wall thicknesses, and lengths of cold-drawn pipes:

  • Outer Diameter (OD): 5 mm to 250 mm.
  • Wall Thickness: 0.3 mm to 24 mm.

Equivalent Standards: DIN 1629, EN 10216-1

Material: St 20
Equivalent Materials: St44, St45.8, 1020, 1.0256

Chemistry Composition of GOST 8734-75 St20 Steel Pipes

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

Mechanical Properties of GOST 8734-75 St20 Steel Pipes

Tensile Strength , MPa
Yield Strength, MPa
Elongation, %
412 min
245 min
21 min

Outside Diameter & Tolerance of of GOST 8734-75 St20 Steel Pipes

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 of of GOST 8734-75 St20 Steel Pipes

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

GOST 8734-78 Steel 20 Seamless Carbon Steel Tube St20 pipes

 

GOST 8734-78 cold-drawn seamless pipes are a premium choice for industries requiring high precision, strength, and reliability. They provide excellent performance in heat exchangers, hydraulics, power plants,