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Cold Drawn Precision Welded Steel Tube DOM Tube Stabilizer Straight Steel Pipe
EN10305-2 Cold Drawn Welded Precision Steel Tubes DOM tubing E155,E195,E235,E275,E355 +C +LC +SR +A +N
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
Steel Grade | C | Si | Mn | P | S | |
Steel Name | Steel Number | max | max | max | max | max |
E155 | 1.0033 | 0.11 | 0.35 | 0.70 | 0.025 | 0.025 |
E195 | 1.0034 | 0.15 | 0.35 | 0.70 | 0.025 | 0.025 |
E235 | 1.0308 | 0.17 | 0.35 | 1.20 | 0.025 | 0.025 |
E275 | 1.0225 | 0.21 | 0.35 | 1.40 | 0.025 | 0.025 |
E355 | 1.0580 | 0.22 | 0.35 | 1.60 | 0.025 | 0.025 |
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