Material: H13 (4Cr5MoSiV1)
Size of mandrel bar: Dia 90mm-500mm, Length<=18.5m
Chemical Composition:
| Grade | C | Si | P | S | Mn | Cr | Mo | V |
| H13 | 0.3-0.38 | 0.7-1.2 | ≤0.015 | ≤0.005 | ≤0.6 | 4.5-5.5 | 1.0-1.5 | 0.8-1.2 |
Application:
Mandrel Bars are one of the key pieces of tooling required during the production of Seamless Tubes and Pipes. Once the billet has been pierced, the Mandrel Bar supports the tube shell internally during elongation and wall thickness reduction.
| Size | Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation (%) | Reduction of Area (%) | Impact Value (J) | Hardness (HRC) |
|---|---|---|---|---|---|---|
| <200mm | 1127-1274 | >931 | >8 | >25 | >20 | 60-62 |
| >200mm | 1078-1274 | >882 | >8 | >25 | >20 | 60-62 |
MANUFACTURING PROCESS
Our mandrel bars are manufactured using the following processes:
- Steel making (EBT + LF (VD) + ESR);
- Forged using both hydraulic press and rotary forging;
- Annealing;
- Rough machining;
- Magnetic testing;
- Heat treatment – either vertical or horizontal;
- Ultrasonic testing;
- Finish machining including threading if required;
- Chrome plating; and
- Thread phosphating.
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