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Address: Suite 1004, Hongan Plaza, #258 Die Yuan Road, Yinzhou District, Ningbo City, China
Contact name:Richard SHEN
TORICH INTERNATIONAL LIMITED |
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Annealed DOM Drawn Over Mandrel Tubing SAE J525 Automotive Steel Tubes
Annealed DOM Drawn Over Mandrel Tubing, SAE J525 Automotive Steel Tubes
Quick Detail:
SAE J525 Welded Cold Draw Low Carbon Steel Tubing annealed for
bending and flaring
Size range: O.D.:30-350mm W.T.:1-15mm L: 12000mm or Cut to Short Pieces as
specified length
Applications: for Bending and Flaring, Auto Parts
Manufacture:
The tubing is made from flat-rolled steel shaped into a tubular
form, the edges of which are joined and fused together by
electric-resistance welding. After forming and welding, the tubing
is normalized and subject to a cold-drawing operation that shall
result in a 15% minimum reduction in cross-sectional are, of which
8% shall consist in a reduction in wall thickness. Sequent to cold
working, the tubing shall be normailzed via an atmospherically
controlled method to produce a finished product that will meet all
requirement of SAJ525
Dimensions and Tolerances:
The tolerances applicable to the tubing outside diameter and inside
diameter are shown in Table 1.
The tolerances applicable to the tubing wall thickness are shown in
Table 2
Dimensional tolerances can only apply to two of the three tubing
dimesions ( OD, ID, or wall)
Unless otherwise agreed upon between customer and us., dimensional
tolerances shall apply to the tube OD and wall dimensions.
E155,E195,E235,E275,E355, other materials upon agreement with
customers.
| Steel grade | Minimum values for the delivery conditionab | ||||||||||||
| +CC | +LCC | +SR | +Ad | +N | |||||||||
| steel name | steel number | RmMPa | A % | RmMPa | A % | RmMpa | ReHMPa | A % | RmMPa | A % | Rm MPa | ReHCMPa | A % |
| E155 | 1.0033 | 400 | 6 | 350 | 10 | 350 | 245 | 18 | 260 | 28 | 270 to 410 | 155 | 28 |
| E195 | 1.0034 | 420 | 6 | 370 | 10 | 370 | 260 | 18 | 290 | 28 | 300 to 440 | 195 | 28 |
| E235 | 1.0908 | 490 | 6 | 440 | 10 | 440 | 325 | 14 | 315 | 25 | 340 to 480 | 235 | 25 |
| E275 | 1.0225 | 560 | 5 | 510 | 8 | 510 | 375 | 12 | 390 | 21 | 410 to 550 | 275 | 21 |
| E355 | 1.0580 | 640 | 4 | 590 | 6 | 590 | 435 | 10 | 450 | 22 | 490 to 630 | 355 | 22 |
| a. Rm: tensile strength ; ReH: upper yield strength (but see 11.1); A: elongation. For symbols for the delivery condition see Table 1. | |||||||||||||
| b. 1 Mpa = 1 N/mm2 | |||||||||||||
| c. Depending on the degree of cold work in the finishing pass the yield strength may nearly be as high as the tensile strengths. 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 relations is recommended: ReH ≥0.5 Rm | |||||||||||||
| e. For tubes with outside diameter ≤ 30 mm and wall thickness≤ 3mm, the ReH minimum values are 10 Mpa lower than the values given in this Table. | |||||||||||||
3. Production method:
Cold drawn on the welded steel tubes, to reach high accuracy on the
OD and WT tolerance
4. Packing:
In Hexagonal Bundles, with anti-rust oil protection, with seaworthy
packing
5. 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
Production Steel Tube:
1. Incoming Raw Material Inspection
2. Raw Material Segregation to avoid steel grade mix-up
3. Heating and Hammering End for Cold Drawing
4. Cold Drawing and Cold Rolling, on line inspection
5. Heat Treatment, +A, +SRA, +LC, +N, Q+T
6. Straightening-Cutting to specified length-Finished Measuring
Inspection
7. Machanical Testing in own labs with Tensile Strength, Yield
Strength, Elongation, Hardness, Impact, Mictrostruture etc
8. Packing and Stocking.
100% of our steel tubes are dimensionally checked
100% of our steel tubes are visually checked to assure they have a
perfect surface condition and no surface defects.
100% eddy current test and ultrosonic test to eliminate
longitudinal and transversal defects.
FAQ:
Q: Are you trading company or manufacturer ?
A: We are factory.
Q: How long is your delivery time?
A: Generally it is 5-10 days if the goods are in stock. or it is
15-20 days if the goods are not in stock, it is according to
quantity.
Q: Do you provide samples of honed tube ? is it free or extra ?
A: Yes, we could offer the sample for free charge but do not pay
the cost of freight.
Q: What is your terms of payment ?
A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shippment.
