A kind of medium carbon alloy steel for automobile steering knuckle and preparation method thereof

Abstract

The invention provides a medium-carbon alloyed steel for an automobile steering knuckle and a preparing method thereof. The chemical components of the medium-carbon alloyed steel for the automobile steering knuckle comprise, by mass percent, 0.38 to 0.42% of C, 0.17 to 0.37% of Si, 0.60 to 0.90% of Mn, 0.90 to 1.10% of Cr, 0.015 to 0.035% of Al, not larger than 0.025% of S, not larger than 0.025%of P, not larger than 0.005% of Ti, not larger than 0.20% of Cu, not larger than 0.30% of Ni, not larger than 0.03% of Sn, not larger than 16*10<-4>% of O, not larger than 70*10<-4>% of N, not largerthan 2.0*10<-4>% of H and the balance Fe and inevitable impurities. According to the medium-carbon alloyed steel for the automobile steering knuckle, the higher needs of the steel for the automobile steering knuckle for the level of nonmetallic inclusions, the comprehensive mechanical property and the like can be well met, and the malignant accident of sudden breaking of the steering knuckle can be avoided.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a medium-carbon alloy steel for automobile steering knuckles and a preparation method thereof. Background technique [0002] After years of development, my country's automobile steering knuckle market has developed rapidly, and the market size has already possessed certain competitiveness. The car steering knuckle is the key connection between the front axle of the car and the wheels. Steering knuckle, as an important security part and the most technical representative part of the car, is assembled with the front axle through the kingpin to form the main component of the car steering axle. [0003] When the car is running, the steering knuckle must not only bear the load of the car body, the impact of the road surface and the twisting force when turning, but also ensure that the car has sufficient impact toughness when braking. Therefore, the steering knuckle material of the ...

AI Technical Summary

Problems solved by technology

However, with the development of high-speed and heavy-duty vehicles, the level of non-metallic inclusions and comprehensive mechanical properties of some commonly used medium-carbon steels or medium-carbon alloy steels cannot meet the quality requirements of heavy-duty vehicle steering knuckle steel.

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