Product data for Sanbar 64 hollow drill steel
Sanbar 64 is an air-hardening, high nickel alloy steel with good response to carburizing. It has excellent fatigue strength and wear resistance in the case hardened condition.
Applications
Sanbar 64 is used for extension rods, shank rods and tapered rods.
Mechanical properties
| Proof strength Rp0.2 MPa (ksi) | Tensile strength Rm MPa (ksi) | Hardness |
|---|---|---|
| 900 (131) | 1250 (181) | 37-44 HRC |
Decarburization
The maximum permissible decarburization depth is 0.30 mm (0.012 in.) on the outer surface and 0.20 mm (0.008 in.) on the inner surface.
Machinability
Sanbar 64 can be machined in the hot rolled condition.
Forging
Induction heating to 1000–1100°C (1830–2010°F), 10–60 seconds, depending on dimension. Forging range 1100–850°C (2010–1560°F).
Read more about forging of Sanbar 64
Heat treatment
Annealing (induction heating) 680–720°C (1260–1330°F). Cooling in air.
Read more about heat treatment of Sanbar 64
Gas carburizing and direct quenching
920–930°C (1690–1705°F). Time depends on the required carbon content and the case depth. Cooling in forced air.
Tempering
Recommended surface hardness 57–62 HRC and core hardness 36–44 HRC temperature approximately 180–230°C (355–450°F) for one hour.
Surface induction hardening
Hardening
Hardening: Induction heating to 900– 1000°C (1650–1830°F), 3-6 seconds. Quenching in water or in oil.
Tempering
Recommended surface hardness 50–55 HRC, temperature 150 to 250°C (300– 480°F). Tempering may not be needed.
Sizes and tolerances
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