The influence of production technology on the properties of JQK490CR steel used for automobile axle housing was studied mainly through composition design and cooling rate control after rolling. The results showed that the strength of JQK490CR steel showed an increasing trend with the increase of alloying element Mn,Cr,Nb,V and Ti content. Trace ele-ment of Nb,V,Ti can improve the mechanical properties of JQK490CR steel to a certain extent within the range set by the experiment,and the optimum content range of Nb is 0.050％～0.052％,the strengthening effect of V is better when it is a-bout 0.05％. With the increase of the cooling rate after rolling,the strength of JQK490CR steel continues to increase,and the plastic toughness has decreased,but all meet the requirements of the national standard.
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