15Cr alloy structural steel wide range of uses: This steel is mainly used to manufacture high speed section is not working (≤ 30mm), but require a higher core part strength and toughness and wear-resistant surface carburizing parts such as gears

42CrMo steel is high strength steel, high strength and toughness, hardenability is also good, no obvious temper brittleness, after quenching has a higher resistance to fatigue limit and repeated shocks, good low temperature impact toughness.

40cr alloy round bar is widely used in the manufacture quenched withstand moderate work load and medium speed mechanical parts , such as automotive steering knuckles, and rear axle gear on the machine shaft , worm , spline shaft , top covers.

38CrSi steel main features: it is a kind of high intensity, the medium toughness of steel, it is the hardenability of a little well, than 40 cr in oil critical hardening of 25-83.5 mm in diameter.