6 - 80mm Round Steel Tubing High Precision E235 Controlled By Ultrasonic Test

Standard En10305-2 Material E355 High Precision Weld Steel Tube

Cold drawn welded pipe, it is the production of one of the best choice of the multistage hydraulic cylinder tube, its process and precision seamless steel tube cold drawing process, is to use precision resistance welding (ERW) precision drawing, manufacturing the EN 10305-2 eu mechanical cold drawn steel tube welding standard.

After welding of resistance welded pipe, the overall pipe body passes through the positive fire to ensure that the weld and heat affected zone are in the same quality as the other parts in the metallographic structure and mechanical properties; Cold drawing and subsequent heat treatment (eliminating internal stress) and steel pipe have good size and mechanical properties.

 +C No heat treatment after the final cold drawing process
 +LC After the final heat treatment there is a suitable drawing pass
 +SR After the final cold drawing process there is a stress relieve heat treatment in a controlled atmosphere
 +A After the final cold drawing process the tubes are annealed in a controlled atmosphere
 +N After the final cold drawing operation the tubes are normalized in a controlled atmosphere

Producing Process

Produced by cold drawing over mandrel and die on the ERW welded steel tube, to achieve better tolerance and good concentricity, both outside and inside weld seam is completely removed during the cold drawing process.

Advantage (compare with seamless cold drawn tube)

Better shape

Improved quality surface

Tight Excentricity and wall thickness tolerances

Good toughness at low temperature

USA Market: 90% of the cylinder in the USA market are produced with welded tubes

Cost fix Lengths More Cheaper

Application:

High Precision Steel Tube is Widely Used in

Automotive Part,

Hydraulic System,

High-precsion Machining.