In the production of high-strength components, if it is low-carbon steel, but also for your use in the case in the quenched state. Adding Si infiltration of hydrogen can be suppressed to improve the delayed fracture (fracture time in this case). In the quenched carbide does not precipitate, as the position of the hydrogen capture only dislocations and grain boundaries, dislocations are evaluated according to the X-ray diffraction lattice distortion, grain boundaries are based on the measurement of grain size, grain boundary area After calculating the evaluation. After adding Si, trapping hydrogen position will be reduced, inhibited the infiltration of hydrogen. In the Si content is high, the phase transition point will rise, and therefore to increase the quenching temperature. As a result, the original austenite grain size will increase. Although the grain size is increased to a high Si steel the same, but no corresponding decrease in the lattice distortion, delayed fracture characteristics are not changed. It can be believed that the main factors affecting the delayed fracture Quenching is the reduction factor is greater than the grain boundary dislocations reduction factor.