High carbon steel wire rod and preparation method thereof

Abstract

The invention relates to a high carbon steel wire rod with tensile strength of more than 1,200 MPa and surface shrinkage of more than 35 percent and a preparation method thereof. The high carbon steelwire rod comprises the base components of C, Si, Mn, Cr and the like, selective components of Ni, Cu, Al, B, Ti, Nb, Mo and the like, and the balance of Fe and impurities. The preparation method comprises the following procedures of smelting, casting, rolling and cooling control sequentially, wherein the rolling-starting temperature of the rolling procedure is controlled between 1,000 DEG C and 1,100 DEG C, the spinning temperature is 870-930 DEG C, the cooling controlling procedure is carried out by adopting Steyr cooling control, rapid cooling is adopted before the phase change and at the earlier stage of the phase change, and the slow cooling is adopted at the later stage of the phase change. The high carbon steel wire rod has excellent mechanical performance, less alloy elements and low cost; and meanwhile, the preparation method is realized by only less adjusting the prior production process of the high carbon steel wire rod without nearly adding any production cost.

Description

technical field [0001] The invention specifically relates to a high-carbon steel wire rod and a preparation method thereof. The high-carbon steel wire rod has a tensile strength of more than 1200 MPa and an area shrinkage rate of more than 35%. Background technique [0002] When wire rods such as high carbon steel wire rods are used to produce prestressed steel strands, galvanized steel wires, steel cored aluminum strands, steel wire ropes, spring steel wires, and piano wires, they generally need to be drawn through multiple passes. The rate is as high as 64-96%. In order to make the finished steel wire have better mechanical properties, there are high requirements for the strength, area shrinkage, repeated bending and torsion performance of the original wire rod. SWRH82B is a product with the largest output and widest application among high carbon steel wire rods. Its composition is located near the eutectoid point of the Fe-C equilibrium phase diagram. The sorbite rate i...

AI Technical Summary

Problems solved by technology

SWRH82B is a product with the largest output and widest application among high carbon steel wire rods. Its composition is located near the eutectoid point of the Fe-C equilibrium phase diagram. The sorbite rate in the center of the bar is generally higher than 75%, and it also contains common harmful structures such as martensite or reticular cementite, and the existence of martensite and reticular cementite in the center often leads to pulling Broken wire accidents in the process reduce the productivity of downstream customers and the performance of final products

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