DOM E155 E195 E235 E275 E355 Carbon Steel Pipe Seamless Hydraulic Tube

DOM E155 E195 E235 E275 E355 Carbon Steel Pipe Seamless Hydraulic Tube

Size range: O.D.:6-420mm W.T.:1-50mm L:max12000mm

Applications: for auto industry/machinery use/oil cylinder tube/motorcycle shock absorber/auto shock absorber/inner cylinder/telescopic cylinders/jack lifting system/hydraulic cylinders

Appearance:
The internal and external surface finish of the tubes is smooth, while the Weld Seam is somehow not visible or tangible.
The ID surface with roughness Ra≤4μm, the best ID smoothness we could reach Ra≤0.8μm
The inner surface can be measured and reported if this is requested by the purchaser before PO.

Supplying Steel Grade:
E155, E195, E235 E275, E355

Delivery Condition:
+C, +LC, + SR, +A, +N

Production Method:
DOM, ERW+ cold drawn

Mechanical properties in room temperature

Chemical composition (ladle analysis)

DOM is a process that is applied to tubing after it is initially constructed.It is refferred to as Seamless ,It can be said that do seamless process method on ERW tubes,So the tubes will have a high strength ,high quality .Material form E155 E195 E235 E275 E355 1020 1026 and so on .DOM tubing is commonly use in auto parts .

Steel Grade and Chemical Compositions

aRm: tensile strength; ReH: upper yield strength; A: elongation after fracture
b 1Mpa=1N/mm2
c Depending on the degree of cold work in the finishing pass the yield strength may nearly be as high as the tensile strength.
For calculation purposes the following relations are recommended:
for delivery condition +C: ReH ≥0.8 Rm
for delivery condition +LC: ReH ≥0.7 Rm
d For calculation purposes the following relation is recommended:ReH≥0.5Rm

Production Process:
Cold rolling by Cold pilger machine and Cold rolling machine
Size: 20-350mm

1. Standard:
EN10305-2 Cold Drawn Precision Seamless Steel Pipes

2. Steel Grade:
E155,E195,E235,E275,E355, other materials upon agreement with customers.

3. Production method:
Cold drawn on the welded steel tubes, to reach high accuracy on the OD and WT tolerance

4. Size range:
O.D.:20-350mm W.T.:1-35mm L:max12000mm

5. Packing:
In Hexagonal Bundles, with anti-rust oil protection, with seaworthy packing

6. Deliver condition:
1). +C No heat treatment after the final cold drawing process
2). +LC After the final heat treatment there is a suitable drawing pass
3). +SR After the final cold drawing process there is a stress relieve heat treatment in a controlled atmosphere
4). +A After the final cold drawing process the tubes are annealed in a controlled atmosphere
5). +N After the final cold drawing operation the tubes are normalized in a controlled atmosphere

Precision camshaft Tube Small Outside Diameter Welded Pipe 26MnB5 34MnB5 For Cam

Production Method:
The cold drawn welded tube is produced by drawing ERW (electric resistance welded tube).During this process the sizing (wall thickness, inside and outside diameter), as well as weld integrity and surface finish is closely controlled to produce tube of the required size and mechanical property characteristics.

Main Date
Material: E355
Other Aviliable Material: E155 E195 E235 E275
Outer Diameter Range: 10-50mm
Wall Thickness Range: 1.5-8mm
t/D ≥ 0.2(Normal: t/D=0.1)
Standard: En10305-2
Process: Cold Drawn, Cold Rolling

Delivery Condition:
1) +C No heat treatment after the final cold drawing process.
2) +LC After the final heat treatment there is a suitable drawing pass.
3) +SR After the final cold drawing process there is a stress relieve heat treatment in a controlled atmosphere.
4) +A After the final cold drawing process the tubes are annealed in a controlled atmosphere.
5) +N After the final cold drawing operation the tubes are normalized in a controlled atmosphere.

Advantage (compare with seamless cold drawn tube)
Better shape
Improved quality surface
Tight Excentricity and wall thickness tolerances (the eccentric
Tube more safety
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