Specifications: diameter: 320 to 127 mm thickness: 0.4 to 12.7 mm Length: 6 m above, and, in accordance with customer demand, supply and other specifications of steel pipe

St52,St52.3,St52.4 Seamless Pipe

Specifications and Standards:

DIN1629 ST52 Steel Pipe

Structure  . Machine . honed Tube

Application:Precision Seamless Steel Tubes,pipes

Demention Tolerances

Outside Diameter Tolerance Unit:mm


Processing mode Diameter Length Linearity Precision Roughness of inner hole
Cold rolling 30-100 ≤ 12M 0.3-1.0 H8-H10 0.4-1.6
Cold drawn 30-250 ≤ 12M H8-H10 0.8-1.6
Grinding 40-500 ≤ 12M 1000 H8-H9 0.4-0.8
Rolling 40-400 ≤ 7M H8 0.4
Pipe Tolerances
Hot Rolled(extrude,expansion) +/- 1% D or 0.50,choose the larger one
Cold Drawn(Rolled) +/- 1% D or 0.30,choose the larger one

The Tolerance of the wall thickness of hot rolled (extrude,expansion)steel pipes unit:mm

Steel pipe types outside diameter S/D Tolerances
Hot Rolled(extrude) <=102 --- +/-12.5%S or +/-0.40,choose largest
^ >102 <=0.05 +/-15%S or +/-0.40,choose largest
^ >102 >1.05-0.10 +/-12.5%S or +/-0.40,choose largest
^ >102 >0.10 +/-12.5%S,-10%S
Expansion ---- --- +/-15%S

The tolerances od wall thickness of cold drawn steel pipes unit:mm

steel pipe types wall thickness tolerances
cold drawn (rolled) <=3 +/-15%S,-10%S or +/-0.15,Choose the larger one
^ >3 +/-12.5%S,-10%S

Chemical Composition

Standard Grade C Si Mn P<= S<= Cu<= Ni<= Cr<= Mo<= V
GB/T8162 10# 0.07-0.14 0.17-0.37 0.35-0.65 0.035 0.035 0.25 0.25 0.15 / /
^ 20# 0.17-0.24 0.17-0.37 0.35-0.65 0.035 0.035 0.25 0.25 0.25 / /
^ 35# 0.32-0.39 0.17-0.37 0.50-0.80 0.035 0.035 0.25 0.25 0.25 / /
^ 45# 0.42-0.50 0.17-0.37 0.50-0.80 0.035 0.035 0.25 0.30 0.25 / /


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