High hardness and good wear resistance. When grinding, its disadvantage is that it has a high viscosity and quickly heats up. However, it is easier to grind than any carbon steel and it is much easier to cut with a hand saw.
The annealing temperature of 440C is very low, and the hardness usually reaches HRC56-58. It has strong corrosion resistance and toughness, and is now more widely used in hand made knives and high-quality factory made knives. Carbon C: 0.95~1.20 Silicon Si: ≤ 1.00 Manganese Mn: ≤ 1.00 Sulfur S: ≤ 0.030 Phosphorus P: ≤ 0.035 Chromium Cr: 16.00~18.00 Nickel Ni: Allow to contain ≤ 0.60 Molybdenum Mo: Can be added ≤ 0.75 Hardness: Annealed, ≤ 269HB; Quenching and tempering, ≥ 58HV
Mechanical properties:
Internal stress (250 N/mm2), tensile strength (560 N/mm2), EL (18%), HB (250), heat treatment specifications and metallographic structure: heat treatment specifications: 1) annealing, 800~920 ℃ slow cooling; 2) Quenching, oil cooling at 1010-1070 ℃; 3) Tempering, quick cooling at 100-180 ℃.
Metallographic structure: The structural feature is martensitic type. Among domestic stainless steel grades, 440C has a higher hardness. Mainly used for manufacturing bearing parts that work in corrosive environments and non lubricated strong oxidizing atmospheres. 440C has good high-temperature dimensional temperature resistance, so it can also be used as a corrosion-resistant high-temperature bearing steel. In addition, it can also be used to manufacture high-quality knives, such as medical machining surgical knives, scissors, nozzles, bearings, etc.
440F: It is a steel grade that improves the easy cutting performance of 440C steel. It is used in automatic lathes, martensitic stainless steel, and ordinary alloy steel, which have the characteristics of hardening through quenching. 440C has a lower ability to withstand dynamic loads. Mechanical properties: internal stress (250 N/mm2) tensile strength (560 N/mm2) EL (18%) HB (250)
Heat treatment specifications: 1) Annealing, 800~920 ℃ slow cooling; 2) Quenching, oil cooling at 1010-1070 ℃; 3) Tempering, quick cooling at 100-180 ℃.
Metallographic structure: The structural feature is martensitic type. Delivery status: Generally delivered in a heat treated state, with the type of heat treatment specified in the contract; Those not specified shall be delivered in a non heat treated state. Usage: After quenching, 440c steel has high hardness and good corrosion resistance (with magnetism). After quenching, the hardness of tableware (knives) and turbine blades increases compared to 440 steel (with magnetism). Blade, nozzle, valve, ruler, tableware (scissors).
Link to this article：What is 440c steel? What are the characteristics of 440c steel?
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