短時間浸炭用鋼について

概要

論文の詳細を見る
To save energy for gas carburizing, the processing time should be reduced. So new processes have been explored desperately and high-temperature ones, especially vacuum carburizing, are regarded as most promising. On the other hand few works have been carried out on steels themselves, which are also able to reduce the processing time.As is commonly known the higher carbon content in the steel results in the deeper penetration of carbon, and yet the higher hardness of the core and the larger distortion of the parts on quenching. And decreasing alloying elements to eliminate the latter reactions will generally shorten the case depth.Still molybdenum addition in the adequate quantity to medium carbon steels was expected to meet the above requiremets. Upon this the influence of Mo content on the carburizing characteristics was investigated throughly and new Cr-Mo steels with medium carbon have been developed.For example, 0.27%C-0.6%Mn-0.6%Cr steel containing 0.15%Mo shows enough case depth in the processing time 20% less than JIS SCr 420 (Cr steel corresponding to SAE 5120). This new steel has equivalent core-hardenability and tensile/fatigue strength to it.
大同特殊鋼株式会社の論文