ST45,SAE1026,E355,E460,4130,4140 High Precision Seamless Steel Pipe

High Precision Seamless Steel Pipe

production standards:

GB/T 3639;GB/T 1591;GB/T 699;DIN2391;EN10305-1;ASTM A519

condition of delivery :

condition of deliveryCodeExplain
Cold drawing or cold rolling / hard +CFinal cold drawing or cold rolling without heat treatment
Stress relieving annealing after cold drawing or cold rolling +SRAfter final cold drawing or cold rolling, the steel tube is eliminated by   stress annealing
annealing +AAfter final cold drawing, the steel tube is annealed
normalizing +NAfter final cold drawing, the steel pipe is normalized

20#,45#, Q345B,Q345D,25Mn,27SiMn,E355,SAE1026,STKM13C, E460, 4130, 4140

Chemical composition:

  Chemical composition, %
steel gradeCSiMnPSCrNiVAl
20#0.17-0.240.17-0.370.35-0.650.0350.0350.2500.250//
45#0.42-0.500.17-0.370.50-0.800.0350.0350.2500.300//
Q345B≤0.2≤0.51.00-1.600.0300.0300.3000.2500.08/
Q345D≤0.2≤0.51.00-1.600.0300.0300.2500.2500.1500.015
25Mn0.22-0.290.17-0.370.70-1.000.0350.035////
27SiMn0.24-0.321.10-1.401.10-1.400.0350.0350.3000.300//
E355(ST52)≤0.22≤0.55≤1.60.0250.0250.2500.250//
SAE10260.22-0.280.15-0.350.60-0.900.0400.050////
E460≤0.22≤0.601.20-1.600.0300.0300.3000.8000.200.02
41300.28-0.330.15-0.350.40-0.600.0400.0400.80-1.10///
41400.36-0.430.15-0.350.75-1.000.0400.0400.80-1.10///

Mechanical property

steel gradeDelivery status
 +C +SR +A +N
Rm/MpaA/%Rm/MpaRel/MpaA/%KV2/JRm/MpaA/%Rm/MpaRel/MpaA/%KV2/J
20(ST45)55055203751239021440~57025521
45645460045065901454034018
Q3456808580450102745022490~6303552234
25Mn(SAE1026)6506560430104302046030020
E355(ST52)6808580450102745022490~6303552234
27SiMn750465052086001065043014
E46069062013

Note: Rm: tensile strength;  Rel: lower yield strength;  A: elongation;

KV2: shock absorption energy.

Q345 shock absorption energy in accordance with B, C, D, E, respectively, corresponding to  20°C、0°C、-20°C、-40°C.

We can produce outer diameter 4mm-273mm, high precision cold drawn steel tube, cold-rolled steel tube, precision steel pipe, stainless steel tube, stainless steel tube wall thickness 0.1mm-25mm, accuracy up to /+0.025 mm, roughness of 0.2.

It is mainly used in hydraulic system pipes, automobile manufacturing pipelines, military industry, construction machinery, railway locomotives, aerospace, shipbuilding, petrochemical, power plants, boiler equipment, etc..

There are 6 main characteristics of our product:

1. There is no oxide layer on the inner wall and outer wall.

2. No leakage under tremendous pressure.

3. High accuracy.

4. High finish.

5.Cold bending without deformation.

6.No combustion, shrinkage, flattening, no cracks.