Project Description
Sanbar64/22CrNi3Mo is an air-hardening, high nickel alloy steel with good response to carburising. It has excellent fatigue strength and wear resistance in the case hardened condition.
Applications:
Sanbar64/22CrNi3Mo is one of rock drill steels. And it is used for extension rods, shank rods and tapered rods.
Chemical Composition(%):
| C | Si | Mn | P | S | Cr | Mo | Ni |
|---|---|---|---|---|---|---|---|
| 0.24 max | 0.30 max | 0.70 min | 0.025 max | 0.025 max | 1.20 min | 0.20 min | 2.70 min |
Mechanical Properties(T=20°C):
| Tensile Strength Rm (Mpa) | Yield Strength Rp0.2 (Mpa) | Hardness (HRC) |
|---|---|---|
| 1250 min | 900 min | 37-44 |
Decarburization:
The maximum permissable decarburization depth of this rock drill steels 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).
Heat Treatment:
Annealing (induction heating): 680–720°C (1260–1330°F). Cooling in air.
Gas carburizing and direct quenching (induction heating): 920–930°C (1690–1705°F). Time depends on the required carbon content and the case depth. Cooling in forced air.
Hardening:Induction heating to 900– 1000°C (1650–1830°F), 3-6 seconds. Quenching in water or in oil.
Tempering: Recommended surface hardness 57–62 HRC and core hardness 36–44 HRC temperature appr. 180–230°C (355–450°F) for one hour. Recommended surface hardness 50–55 HRC, temperature 150 to 250°C (300– 480°F). Tempering may not be needed.
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