Use of Products: SCM435 is a commen steel grade which used to produce high strength bolt of class 12.9.This product has characteristics of uniform-chemical composition, low percentage of harmful elements, high purity, slight decarburisation, good surface quality. After spheroidize annealing, this product has the characteristics of good cold heading properties ,stable heat-treatment properties and good hardenability. SCM440 is similar to SCM435,but higher strength and hardenability.