Steel ingot and processing technology thereof

The invention discloses a steel ingot and a processing technology thereof. Main alloy elements of chemical components of the steel ingot comprise, by mass, 0.42-0.50% of C, 0.18-0.35% of Si, 0.60-0.80% of Mn, less than or equal to 0.25% of Cr, less than or equal to 0.025% of P, less than or equal to 0.025% of S, less than or equal to 0.25% of Ni, less than or equal to 0.25% of Cu, and the balanceFe. The hardness from inside to outside of the steel ingot is relatively uniform. Transfer of a heat treatment structure in the processing technology is relatively single. A metallographic structure is finer and more uniform. More prominent advantages are that a core structure of materials is compact, and deviation of surface toughness and core toughness is minimum, so that utility value is big infinish machining. Moreover, the process cycle is shortened and cost is reduced. 本发明公开了种钢锭及其加工工艺，所述钢锭的化学成分中各主要合金元素的质量百分比为：C为0.42～0.50%，Si为0.18～0.35%，Mn为0.60～0.80%，Cr≤0.25%，P≤0.025%，S≤0.025%，Ni≤0.25%，Cu≤0.25%，余量为Fe，本发明得到的钢锭由内至外