Low carbon alloy steel treatment method

The invention provides a low carbon alloy steel treatment method. The low carbon alloy steel treatment method comprises the following steps that (a) a low carbon alloy steel blank is cast and forged into a plate blank; (b) the plate blank is subjected hot rolling to obtain an finish-rolled plate; and (c) the end-rolled plate is deformed immediately after being heated to the two-phase region temperature and subjected to water quenching to the room temperature after heat preservation. According to the low carbon alloy steel treatment method, two-phase region heat preservation alloy element partition behaviors, vacancy generation of two-phase region heat deformation and interstitial atoms of low carbon alloy steel are combined to achieve the effect of improving alloy element partition, the effect of inherent alloy elements in steel is achieved, the concentration degree, in austenite (room temperature martensite), of the alloy elements is improved on the basis that original C partition is fully achieved, and favo