The 440c material is better, and the 440c has better rust resistance.
440C steel is a martensitic stainless steel. The carbon content is 1.0%, and the chromium content is 16-18%. Strong rust resistance, made of high-quality stainless steel. Scope of application: Mainly used for manufacturing bearing parts that work in corrosive environments and non lubricated strong oxidizing atmospheres. 440C has good high-temperature dimensional stability, so it can also be used as a corrosion-resistant high-temperature bearing steel. In addition, it can also be used to make high-quality knives, such as medical Scalpel, scissors, nozzles, bearings, etc. The ability of 440C to withstand dynamic loads is relatively low.
D2 steel is high abrasion resistant, micro deformation cold work die steel, and wind hardened Tool steel, with carbon content up to 1.5% and chromium content up to 11.5%. Overall, 440C is better, with slightly lower hardness, but sufficient for use, good rust resistance, and more convenient.
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