We are professional AISI 440C(1.4125, UNS S44004,X105CrMo17)Forged/Forging Round Bars factory from china
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 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.
| Chemical Composition |
| | Min. % | Max % |
| Carbon | 0.95 | 1.20 |
| Silicon | 0 | 1.00 |
| Manganese | 0 | 1.00 |
| *Nickel | 0 | 1.00 |
| Chromium | 16.00 | 18.00 |
| Molybdenum | 0.00 | 0.75 |
| Phosphorous | 0 | 0.04 |
| Sulphur | 0 | 0.03 |
| *Nickel addition optional. |
| Mechanical Property Requirements For Material in the Annealed Condition to 1) AS2837 - 1986 440C and 2) ASTM A276-98b 440C |
| Specification | AS2837-1986 440C | |
| Finish | | |
| Brinell Hardness | 269 Max | |
| Capable of attaining Rc59 minimum in 10mm test bar oil quenched from 1010oC - 1070oC. |
| Specifrication | ASTM A276-98b 440C | |
| Finish | Hot Finished | Cold Finished |
| Brinell Hardness | 269 Max | 285 Max |
| Capable of attaining Rc58 minimum in 9.50mm test bar air cooled 1020oC. |
| Typical Mechanical Properties At Room Temperature in the Annealed Condition (AS Supplied) |
| Tensile Strength Mpa | 785 |
| Yield Strength Mpa | 420 |
| Elongation in 50mm % | 15 |
| Impact Charpy J | 6 |
| Hardness | HB | 240 |
| Rc | 24 |
| Typical Mechanical Properties At Room Temperature - Hardened By Oil Quench at 1030oC and Tempered as Indicated |
| Tempering Temperature oC | 150 | 200 | 250 | 300 | 350 | 400 |
| Tensile Strengt Mpa | 2050 | 2020 | 1980 | 1890 | 1820 | 1780 |
| Yield Strength Mpa | 1930 | 1896 | 1845 | 1760 | 1675 | 1635 |
| Elongation in 50mm % | 4 | 4 | 4 | 4 | 4 | 4 |
| Impact Charpy J | 9 | 9 | 9 | 9 | 9 | 9 |
| Hardness Rc | 60 | 59 | 57 | 56 | 56 | 56 |
Section Size 25mm
High tensile strength, high yield strength and high hardness but low impact properties. |
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