The Q10B33-B produced by XINGTAI STEEL is mainly used to produce 10.9 grade standard parts. The product has the advantages of stable composition, high purity of steel, small decarburization layer, low cracking rate in cold heading, low original hardness of wire rod, high strength after heat treatment and good hardenability. A customer of XINGTAI STEEL used the product to produce bolts for construction machinery, which reflected that the product quality was stable and met the requirements of use.