Prestressed steel wire with small relaxation rate and manufacturing method of prestressed steel wire

Abstract

The invention belongs to the field of steel wire production processes, and relates to a prestressed steel wire with a small relaxation rate and a manufacturing method of the prestressed steel wire. The prestressed steel wire is prepared from the chemical components in percentage by mass: 0.80-0.85% of C, 0.10-0.30% of Si, 0.60-0.90% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S, less than or equal to 0.10% of Ni, less than or equal to 0.35% of Cr, less than or equal to 0.2% of Cu, and less than or equal to 0.15% of V. The manufacturing method comprises the following steps: wire rod acceptance check, acid pickling and phosphorization, examining, drawing, semi-finished product examining and testing, stabilizing treatment, wire collection, and finished product examining and testing. By formulating the reasonable semi-finished product size, drawing process and stabilizing treatment process and meanwhile finding the appropriate stabilizing treatment temperature, the relaxation value of 1000 hours of the phi 7.50 mm prestressed steel wire reaches to be the optimum, it is examined that the relaxation rate is 0.93%, and thus the requirement that the relaxationrate is smaller than or equal to 2.5% is met.

Description

technical field [0001] The invention belongs to the field of prestressed steel wire production technology, and relates to a small relaxation rate prestressed steel wire and a manufacturing method thereof. Background technique [0002] At present, the prestressed steel wire production line is generally composed of a pay-off machine, a deformation die and a lubrication system, a straightening wheel set, an intermediate frequency furnace, a cooling device, a tension wheel, and a wire take-up device. In the manufacturing process of prestressed steel wire, the effect of the stabilization treatment of the steel wire plays an important role in the low relaxation performance of the prestressed steel wire itself. [0003] There is generally only one tension wheel in the equipment used in the existing production line. Therefore, due to the limitation of the structure of the equipment itself, it is impossible to independently adjust the tension of the steel wire during the medium frequ...

AI Technical Summary

Problems solved by technology

[0003] There is generally only one tension wheel in the equipment used in the existing production line. Therefore, due to the limitation of the structure of the equipment itself, it is impossible to independently adjust the tension of the steel wire during the medium frequency induction heating process. Good low relaxation performance can only rely on the formation of a pre-tension between the die drawing resistance and the traction force to ensure that an equivalent tension is applied when the steel wire is heated by medium frequency induction

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