440C is a high carbon straight chromium high hardenability martensitic stainless steel, generally supplied in the annealed condition with a maximum Brinell hardness of 269 (Rc29) or annealed and cold drawn with a maximum Brinell hardness of 285 (Rc31).Characterised by good corrosion resistance in mild domestic and industrial environments, including fresh water, organic materials, mild acids, various petroleum products, coupled with extreme high strength, hardness and wear resistance when in the hardened and tempered condition.
440C Surface finish
| CD | Cold drawn | P | Polished |
| BD | Bright drawn | SRE | Slit rolled edge |
| CG | Centreless ground | HF | Hot finished |
| CF | Cold finished | HRAP | Hot rolled annealed and pickled |
| P&T | Peeled and turned | RT | Rough turned/peeled |
| ST | Smooth turned | PR | Peeled and reeled |
440C Round Bar Sizes
| Type | SIZES (mm) | SIZES (Inches) | ISO Tolerance |
|---|---|---|---|
| Cold Drawn and Polish | 3.00 – 75.00 | 1/8" – 3.00" | h8-h9-h10-h11 |
| Cold Drawn and Ground | 10.00 – 75.00 | 5/6" – 2.50" | h8-h9-h10-h11 |
| Peeled and Polished | 40.00 – 150.00 | 1.50" – 6.00" | h11, h11-DIN 1013 |
| Peeled and Ground | 20.00 – 50.00 | 3/4″ – 2.00" | h9-h10-h11 |
440C Bars Standard lengths of 2000 mm up to 6000 mm. Cut to size on request (tolerance +2/-0 mm).
| 5.0 | 45.0 |
| 6.0 | 50.0 |
| 7.0 | 55.0 |
| 8.0 | 60.0 |
| 9.0 | 65.0 |
| 10.0 | 70.0 |
| 12.0 | 75.0 |
| 16.0 | 80.0 |
| 20.0 | 90.0 |
| 25.0 | 100.0 |
| 30.0 | 130.0 |
| 35.0 | 160.0 |
| 40.0 | 200.0 |
440C due to its excellent hardenability is capable of being through hardened up to Rc60 depending upon carbon content and section size. Small sections can be air cooled and quite large sections oil quenched for maximum through hardness.Used for parts requiring a combination of excellent wear resistance, plus reasonable corrosion resistance. Typical applications are: Ball Bearings and Races, Bushings, Cutlery, Chisels, Knife Blades, Pump Parts, Surgical Instruments, Valve Seats etc.
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