Hot rolling method for controlling yield ratio of low-carbon cold forging steel

Abstract

A hot rolling method for controlling yield ratio of a low-carbon cold forging steel belongs to steel rolling technical field. Technical parameters of process control are as follows: inlet temperature of beginning rolling is controlled in a range of 950 to 1000 DEG C, and precipitation of aluminum nitride (AIN) in an austenite region is controlled; inlet temperature of pre-precision rolling is controlled in a range of 900 to 950 DEG C, and the precipitation of the AIN in the austenite region is controlled; inlet temperature of precision rolling is controlled in a range of 900 to 950 DEG C, and temperature rising of the precision rolling is controlled within 100 DEG C; after the precision rolling, an appropriate water-cooling process is adopted, temperature of silking is controlled in a range of 860 to 900 DEG C; and after silking, a Stelmor line opens 1-24# insulation cover. The hot rolling method for controlling the yield ratio of the low-carbon cold forging steel has the advantages that the hot rolling method for controlling the yield ratio of the low-carbon cold forging steel can be used for producing low-carbon cold forging steel SWRCH 22A steel wire rods, the yield ratio of hot rolling steel wire rods can be obviously controlled, work hardening of deep drawing of the hot rolling steel wire rods is obviously lowered, silk break rates and losses of abrasive tools are reduced, and service life of wire drawing abrasive tools are substantially prolonged.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular provides a hot rolling method for controlling the yield ratio of low-carbon cold-heading steel, which is applied to high-speed wire factories to produce low-carbon cold-heading steel hot-rolled wire rods. Background technique [0002] Low-carbon cold heading steel hot-rolled wire rod is mainly used to make standard parts. In the subsequent processing process of users, multi-pass deep drawing and large deformation cold upsetting processing are required. The high yield strength ratio (yield strength) and high work hardening rate in the cold working process will lead to a high rate of wire breakage during drawing, aggravate the wear of the mold, and seriously reduce the life of the wire drawing and cold forming mold. Reducing the drawing work hardening of hot-rolled wire rod has become the focus of low-carbon cold heading steel, and is the main aspect of steel rolling process...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a hot rolling method for controlling the yield ratio of low-carbon cold heading steel, which solves the problem of high yield ratio of low-carbon cold heading steel hot-rolled wire rods and reduces the yield ratio of low-carbon cold heading steel

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