HIGH-STRENGTH BOLTING STEEL AND PREPARATION METHOD THEREFOR

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A high-strength bolting steel and a preparation method therefor. The components of the steel are : 0.05 wt% to 0.5 wt% of rare earth elements, 0.35 wt% to 0.45 wt% of carbon, 1.2 wt% to 1.8 wt% of chromium, 0.17 wt% to 0.37 wt% of silicon, 0.4 wt% to 0.8wt % of molybdenum, 0.2 wt% to 0.4 wt% of vanadium, 0 to 0.005 wt% of niobium and the balance of ferrum. The preparation method comprises : hot forging for the bolting steel with the above components is carried out, then quenching and tempering are carried out.