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1975年5月一机部、冶金部批准了低淬钢55DTi 齿轮的初步鉴定后,我厂用55DTi 代替18CrMnTi 钢制造工农—11拖拉机齿轮,转入批量生产,现将低淬钢55DTi 齿轮的试验和批量生产情况介绍于下。一.钢材的化学成份试验和批量生产用的55DTi 钢由齐齐哈尔钢厂供给,其化学成份(%)为:C 0.53～0.60,Si 0.11～0.25,Mn 0.10～0.22,S0.013～0.026,P 0.008～0.03,Ni 0.04～0.07,Cr 0.0(?)～0.08,Cu 0.03～0.04,Ti0.06～0.11。
In 1975 May a machine, the Ministry of Metallurgy approved the low-quenched steel 55DTi gear initial identification, I plant with 55DTi instead of 18CrMnTi steel manufacturing worker-peasant -11 tractor gear, into mass production, now low-quenched steel 55DTi gear test And mass production situation introduced below. I. Chemical composition of steel testing and mass production of 55DTi steel supplied by Qiqihar Steel, the chemical composition (%): C 0.53 ~ 0.60, Si 0.11 ~ 0.25, Mn 0.10 ~ 0.22, S 0.013 ~ 0.026, P 0.008 to 0.03, Ni 0.04 to 0.07, Cr 0.0 (?) To 0.08, Cu 0.03 to 0.04, and Ti 0.06 to 0.11.