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METHOD FOR MANUFACTURING MACHINE COMPONENT FOR AUTOMOBILE EXCELLENT IN FATIGUE INTENSITY

机译:疲劳强度下汽车优秀零件的制造方法

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a machine component for automobiles which is a steel component for carburization cold-forged and carburization hardened without conducting normalizing nor annealing, by which particle grain can be prevented from coarsening during carburization treatment, and to provide the machine component for automobiles using the method.SOLUTION: A steel containing, by mass%, C:0.13 to 0.20%, Si:0.30 to 0.70%, Mn:0.20 to 0.50%, P:0.030% or less, S:0.030% or less, Cr:2.00 to 2.50%, Al:0.010 to 0.050%, Ti:0.02 to 0.08%, Nb:0.02 to 0.08%, B:0.0005 to 0.0035%, N:0.020% or less, and the balance Fe with inevitable impurities is rolled at 1250°C or more to a stab, cooled and then rolled at 800 to 1050°C to a steel material, further applied to a softening heat treatment, then molded into a part shape by cold-forging, and carburization hardening tempered at 950°C or more without normalizing nor annealing to obtain the steel material having the austenitic grain size number of 7 or more.
机译:解决的问题:提供一种用于制造汽车的机械部件的方法,该方法是用于在不进行正火或退火的情况下对渗碳进行冷锻和渗碳硬化的钢部件,由此可以防止颗粒在渗碳处理过程中变粗。解决方法:提供一种以质量%计C:0.13至0.20%,Si:0.30至0.70%,Mn:0.20至0.50%,P:0.030%以下,S的钢: 0.030%以下,Cr:2.00至2.50%,Al:0.010至0.050%,Ti:0.02至0.08%,Nb:0.02至0.08%,B:0.0005至0.0035%,N:0.020%以下将具有不可避免杂质的铁在1250°C或更高温度下轧制到刺中,冷却,然后在800至1050°C轧制成钢材,进一步进行软化热处理,然后通过冷锻成型为零件形状,在不进行正火和退火的情况下,在950℃以上回火渗碳硬化,得到具有奥氏体的钢材。 Nitic晶粒度数为7以上。

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