Simple annealing cold heading steel hot rolled wire rod for high-strength fastener and production method of simple annealing cold heading steel hot rolled wire rod

The invention discloses a simple annealing cold heading steel hot rolled wire rod for a high-strength fastener and a production method of the simple annealing cold heading steel hot rolled wire rod. The simplified annealing cold heading steel hot rolled wire rod comprises, by weight, 0.30-0.40% of C, 0.15-0.25% of Si, 0.60-0.85% of Mn, 0.90-1.10% of Cr, 0.15-0.30% of Mo, smaller than or equal to 0.02% of P, smaller than or equal to 0.025% of S and the balance Fe and micro-impurities. According to the method, due to the fact that the design of alloy components is optimized and the controlled-rolling and controlled-cooling technology is optimized, simple annealing is achieved, and the annealing cost is reduced; energy is saved, pollution is reduced, the production efficiency is improved, and the hot rolled wire rod can be directly formed in a cold heading mode after simple annealing under the premise that the basic technical index of products is met. According to the simple annealing cold heading steel hot rolled wire rod for the high-strength fastener and the production method of the simple annealing cold heading steel hot rolled wire rod, the production cost is not increased, existing equipment and technologies are fully utilized, and the purposes of simplifying the annealing technology and reducing the production cost in the deep machining process of downstream users are achieved. The performance of the produced 12.9-grade finished bolt products meet various index requirements, the rod passing stability is good, and the obvious effects of energy conservation, consumption reduction and environmental friendliness are achieved.