Torich International Limited
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Brake tubes Double wall steel tubes J527 b small diameter tuing for automobiles
Copper brazed double wall steel tube is made of steel strips which is copper plated on both sides.It has widely applied for automobiles,refrigerators and the other hydraulic system industries.
Dimension and specification
| O.D. mm | Thickness mm | Weight g/m | Assurance pressure kg/cm3 |
| 4.76 | 0.7 | 70.28 | 350 |
| 6.00 | 0.7 | 91.76 | 350 |
| 6.35 | 0.7 | 97.75 | 350 |
| 7.00 | 0.7 | 108.75 | 350 |
| 7.14 | 0.7 | 111.17 | 350 |
| 8.00 | 0.7 | 126.31 | 350 |
Tolerance
O.D. and W.T. +/-0.08mm
Chemical Composition
C ≤ 0.12%
Mn ≤ 0.50%
P≤ 0.04%
S≤ 0.045%
Mechanical properties
Tensile strength ≥30kgf/mm2
Yield point ≥18kgf/mm2
Elongation(50mm)≥25%
Hardness(HR30T)≤ 65
Expand test Take 3 samples of 200mm,expand the pipe outside dimension to larger than 25%
Internal cleanliness Particle and oil ＜0.194g/m2
