TORICH INTERNATIONAL LIMITED
TORICH INTERNATIONAL LIMITED The Steel Tube Maker
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17mm High Precision Steel Tube DIN2391 EN10305-1 ASTM A519
Tolerance
Name | Scope mm | DIN seriesmm |
| OD | 04-30 | ±0.08 |
| OD | 31-40 | ±0.15 |
| OD | 41-50 | ±0.20 |
| OD | 51-60 | ±0.25 |
| Wall | 0.5-7 | ±10% |
| Designation | Symbol | Description |
| Cold finished (hard) | BK(+C) | Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation |
| Cold finished (Soft) | BKW (+LC) | The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding) |
| Cold finished and stress-relieved | BKS(+SR) | Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree. |
| Annealed | GBK(+A) | The last Cold forming process is followed by annealing in a controlled atmosphere. |
| Normalized | NBK(+N) | The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere. |
Main feature:
High precision
Excellent brightness
No oxidization on outer and inner walls after heat treatment
High cleanness of inside wall
High pressure
No deformation after clod bending
No crack after flaring and flattening
Color : Gray with white
Application:
Hydraulic system
Automobile
Surface:
NBK
Galvanization/Galvanized/Zinc Coated
Blue White Zinc (Trivalent Chromium Passivation)
Plating Colour Zinc(Trivalent Chromium Passivation)
Yellow, Army-Green
Phosphated/Black Phosphated
Surface quality
Without oxidization
No crack
No fold
No rolling fold
No scar
No laminar defect
What we can do in our testing center
Physis laboratory
Chemical spectrometer
Pressure blasting machine
Metallographic analysis
Salt Spray Test