Jiangsu Hongbao Group Co., Ltd.
Jiangsu Hongbao Group Co., Ltd. Manufacture since 1958
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Cold Drawn Precision Welded Steel Tube DOM Tube Stabilizer Straight Steel Pipe
Description:
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
Standard:
EN10305-2 Cold Drawn Precision Seamless Steel Pipes
Steel Grade:
E155,E195,E235,E275,E355, other materials upon agreement with customers.
Production Method:
Cold drawn on the welded steel tubes, to reach high accuracy on the OD and WT tolerance
Size range:
O.D.:20-350mm W.T.:1-35mm L:max12000mm
Packing:
In Hexagonal Bundles, with anti-rust oil protection, with seaworthy packing
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
