TORICH INTERNATIONAL LIMITED
TORICH INTERNATIONAL LIMITED The Steel Tube Maker
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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 normaIized 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 dimensions ( OD, ID, or wall)
Unless otherwise agreed upon between customer and us., dimensional tolerances shall apply to the tube OD and wall dimensions.
| Table 1- TUBING OUTSIDE DIAMETER TOLERANCE | ||
| Nominal Tubing OD mm | Tolerance OD ±mm | Tolerance ID ±mm |
| Up to 9.50 | 0.05 | 0.05 |
| Over 9.50 to 15.88 inclusive | 0.06 | 0.06 |
| Over 15.88 to 50.80 inclusive | 0.08 | 0.08 |
| Over 50.8 to 63.50 inclusive | 0.10 | 0.10 |
| Over 63.50 to 76.20 inclusive | 0.13 | 0.13 |
| Over 76.20 to 100.00 inclusive | 0.15 | 0.15 |
| WT tolerance shall be not more than 10% | ||
| Table 2- TUBING WALL THICKNESS TOLERANCE | |||
| Nominal Wall Thickness | Nominal OD Through 22mm ±mm | Nominal OD 22-48mm ±mm | Nominal OD 48-100mm ±mm |
| 0.89 | 0.05/0.05 | 0.05/0.05 | 0.05/0.05 |
| 1.00 | 0.05/0.05 | 0.05/0.08 | 0.05/0.08 |
| 1.25 | 0.05/0.05 | 0.05/0.08 | 0.05/0.08 |
| 1.50 | 0.05/0.05 | 0.05/0.08 | 0.05/0.08 |
| 1.65 | 0.05/0.05 | 0.05/0.08 | 0.05/0.08 |
| 2.00 | 0.05/0.05 | 0.05/0.08 | 0.05/0.08 |
| 2.11 | 0.05/0.05 | 0.05/0.08 | 0.05/0.08 |
| 2.410 | 0.05/0.05 | 0.05/0.08 | 0.08/0.08 |
| 2.500 | 0.05/0.08 | 0.05/0.10 | 0.08/0.08 |
| 2.770 | 0.05/0.08 | 0.05/0.10 | 0.08/0.08 |
| 3.000 | 0.05/0.08 | 0.05/0.10 | 0.08/0.08 |
| 3.050 | 0.05/0.08 | 0.05/0.10 | 0.08/0.08 |
| 3.40 | - | 0.05/0.10 | 0.08/0.08 |
| 3.75 | - | 0.05/0.10 | 0.08/0.08 |
| 4.00 | - | 0.08/0.10 | 0.08/0.10 |
| 4.19 | - | 0.08/0.10 | 0.08/0.10 |
| 4.57 | - | 0.10/0.10 | 0.08/0.13 |
| 5.00 | - | 0.10/0.13 | 0.10/0.13 |
| Table 2- CHEMICAL REQUIREMENTS | |
| Element | % |
| Carbon | 0.06-0.18 |
| Manganese | 0.30 to 0.60 |
| Phosphpris | 0.040 max |
| Sulfur | 0.050 max |
| Table 3- MECHANICAL PROPERTIES | |
| Properties | Value |
| Yield Strength,min | 170 Mpa |
| Ultimate Strenth,min | 310 Mpa |
| Elongation in 50mm, min | 35% |
| Hardness ( Rockwell B),max | 65.00 |
Production Steel Tube:
Eddy Current Test and Ultrasonic Test:
Packing: