A low-cost preparation method of B-containing cold heading steel wire rod

By replacing precious metals with low-cost boron and combining it with specific smelting and rolling processes, cold heading steel wire rods with a ferrite + pearlite structure are prepared, solving the problem of high smelting costs and realizing the production of cold heading steel wire rods with stable performance and diversified specifications.

CN122105233APending Publication Date: 2026-05-29GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
Filing Date
2026-04-02
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

The smelting cost of existing cold heading steel wire rod is relatively high, and high-performance products may exceed the budget requirements of mid- and downstream users.

Method used

By using low-cost boron to replace precious metals and controlling the composition and microstructure through specific smelting and rolling processes, cold heading steel wire rods with a ferrite + pearlite microstructure are prepared. These processes include converter smelting, LF furnace refining, small billet continuous casting, and high-speed wire rod rolling. The composition and temperature are controlled, and a ring cooling process is used for cooling.

Benefits of technology

It significantly reduces smelting costs, improves hardenability, meets the diversified needs of midstream and downstream users, ensures product performance stability and diversified specifications, and reduces the impact of cold working performance.

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Abstract

The application discloses a low-cost B-containing cold upsetting steel wire rod preparation method, which comprises the following steps: S1, raw material preparation, according to the mass percentage: C 0.31-0.35%, Si 0.13-0.22%, Mn 0.62-0.68%, P≤0.015%, S≤0.010%, B 0.0008-0.005%, Als 0.025-0.05%, and the rest is iron and inevitable impurities; S2, converter smelting; S3, LF furnace refining; S4, small billet continuous casting; S5, high line rolling; wherein, the smelting end point C is 0.15-0.30%, P≤0.01%, and S≤0.02; the converter tapping temperature is 1600-1640 DEG C. The application realizes low-cost smelting of cold upsetting steel wire rod, and the ferrite content is increased through controlled temperature of finish rolling, so that the purpose of steel online softening is achieved, and the follow-up processing requirement of the user is met.
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