Production process of 65 Mn spring steel wire rod and 65 Mn spring steel wire rod

Abstract

The invention discloses a production process of a 65 Mn spring steel wire rod and a 65 Mn spring steel wire rod. According to the invention, advantages of a device of a high line set are utilized, a finish rolling and reducing-sizing mills adopt 8+4 type, through optimization of a heating cycle process before rolling, a rolling control process and a cooling control process, only 8 front finish rolling machines and 2 reducing-sizing mills are utilized, so that surface decarburization of a spring is reduced and is even removed, and the fatigue life of a finished spring is prolonged; the amount of scales is reduced and the metal yield is improved; a metallographic structure is improved and a high sorbite rate is obtained, so that the production process has conditions to cancel a lead patenting process at the earlier drawing stage, the production processing cost is reduced, and the metallographic structure and the comprehensive performance of a hot-rolled wire rod for the 65 Mn spring steel are optimized. According to the invention, the microstructure quality and the mechanical property of the produced hot-rolled wire rod with phi6.5 mm for the 65 Mn spring steel reach the standard of the conventional 65 Mn spring steel after lead hot-rolled wire rod for the 65 Mn spring steel, the conditions to cancel the lead patenting process at the earlier drawing stage by a downstream user can be satisfied, a processing process is reduced for a user, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a production process of a wire rod, more specifically, to a production process of a 65Mn spring steel wire rod and the 65Mn spring steel wire rod obtained according to the production process. Background technique [0002] Spring steel wire rod has the characteristics of both high carbon and low alloy steel, and is an important raw material for making ordinary spring steel wire, oil quenching-tempering spring steel wire, automobile and agricultural vehicle shock absorber springs, and other mechanical springs. It is a product with high added value and has a large market demand. And 65Mn steel is one of the most important spring steels on the market at present, and it is also one of the spring steels currently used in a large amount in Southwest China. [0003] The main function of the spring is to store elastic strain energy and reduce vibration and impact. Since the spring is generally u...

AI Technical Summary

Problems solved by technology

The 65Mn spring steel wire rod requires high cleanliness and compositional uniformity, and the surface decarburization must be strictly controlled to require uniform structure and performance, otherwise it will cause uneven wire rod performance, resulting in high broken wire rate and affecting Subsequent processing technology performance of the product

[0005] The traditional 65Mn spring steel wire rod adopts conventional rolling, the surface of the finished product is seriously decarburized, the iron oxide scale is thick, and the metal yield is low. The metallographic structure is pearlite with a large lamellar spacing, and the production cost is high.

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