Sanbar 61 is a high strength silicon steel with good toughness and impact resistance in the as-rolled condition.
Applications
Sanbar 61 is used for tapered rods, pilot rods and integral drill steels.
Mechanical properties
| Proof strength Rp0.2 MPa (ksi) |
Tensile strength Rm Mpa (ksi) |
Hardness |
|---|---|---|
| 820 (119) | 1350 (196) | 38-44 HRC |
Decarburization
The maximum permissible decarburization depth is 0.30 mm (0.012 in.) on the outer surface and 0.10 mm (0.004 in.) on the inner surface.
Machinability
Machining may require prior annealing.
Forging
Induction heating to 1000–1100°C (1830– 2010°F), 10–20 seconds, cooling in air. Forging range 1100–850°C (2010–560°F).
Fabrication
Heat treatment
Annealing (induction heating) 730–780°C (1350–1440°F), cooling in air.
Fabrication
Normalizing (induction heating)
1000–1050°C (1830–1920°F), cooling in air. Shank end hardening (case hardening). Fabrication
Hardening: Induction heating to 900–1000°C (1650–1830°F), 2–5 seconds.
Quenching in water or oil.
Tempering
Recommended surface hardness 55–60 HRC, temperature appr. 150–250°C (300–480°F).