軟窒化の実用化例について (軟窒化<特集>)
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概要
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Practical examples and some notes of low temperature gas nitrocarburizing (LTGNC) applied to tools and mechanical parts will be described.If the surface temperature of press forging die is around 200°C its service life gets about 2 times due to the LTGNC but the effect disappears when the tempeature exceeds 800°C. The service life of the said nitrocarburized die is influenced by the core hardness and an attention is to be paid for those dies with deep carving as their corners are inclined to de cracked.The said nitrocarburizing is more advantageous for Al extruding die than tufftriding. DH 71 is the best as the die material.A special steel for LTGNC was developed for mechanical constructional parts and the mechanical properties of the nitrocarburized products made of this steel are having same level as those of conventional case hardening steel parts, and as they have less dimensional change and are stabilized it has widely been adopted as an advantageous method both in application and in cost.
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