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| C 0.36/0.44 | Si 0.10/0.35 | MN 0.45/0.70 | S 0.040 max | P 0.035 max | Cr 1.00/1.40 | Mo 0.20/0.35 | NI 1.30/1.70 |
Virat Special Steels is the largest Supplier & Stockiest of AISI 4340.
40NiCrMo84 is high tensile alloy steel famed for its wear resistance properties and in addition where high strength properties are required.
This Grade is used in components akin to gears, shafts, studs and bolts, its hardness is within the range 248/302 HB. It may be further surface-hardened to create add-ons with more advantageous wear resistance by means of induction or nitriding processing.
Standard hiqh-speed steel qrade. Itswell-balanced alloy composition forms the basis of its high_touqhn-essand good clllting edge retention, rendenng it $uitable for a large variety of appllcatons.
| Thermal Conductivity at °C | 20 | 350 | 700 |
| W/(m*K) | 40.5 | 32.5 | 25.5 |
For all metal-cutting tools for roughing or finishing such as twist drills, diverse milling cutters, thread dies, broaches, reamers, countersinks, thread chasers, circular saw segments, shaping tools and woodworking tools. Also highly suitable for cold-forming tools such as cold extrusion rams and dies, as well as cutting and precision cutting tools, plastic moulds with elevated wear resistance and screws.
| Soft annealing °C | Cooling | Hardness HB |
|---|---|---|
| 650-700 | slowly | max. 280 |
| Stress-relief annealing °C | Cooling |
|---|---|
| 630 - 650 | Furnace |
| 1st pre-heating °C | 2nd and 3rd | Hardening °C | Quenching | Tempering °C | Hardness after Teperature HRC |
|---|---|---|---|---|---|
| up to approx. 400 in an air-circulating furnace | 780 and 1000 | 1190 - 1230 | Saltbath, at least 520 °C Oil ,Air | at least twice 530-560 | 64 – 66 |
