Method for producing 400-500 MPa high-strength anti-seismic deformed steel bars by adopting non-heating low-temperature slitting and rolling

Abstract

The invention relates to a method for producing 400-500 MPa high-strength anti-seismic deformed steel bars by adopting non-heating low-temperature slitting and rolling, comprising the following steps:S1, cutting square billets by a continuous casting machine at 850-1000 DEG C, feeding the square billets into a quick heat preservation roller way by means of a steel slitting device, feeding the square billets into an outlet roller way of a stepper heating furnace, feeding the square billets to a roughing rolling unit at about 800-900 DEG C, rolling rough-rolled intermediate billets by adoptinga slotless rolling hole shape by means of the roughing rolling unit, and cutting heads and removing tails by a flying shear; S2, feeding the rough-rolled intermediate square billets of about 780-870 DEG C into an intermediate rolling unit, rolling intermediate-rolled round billets by adopting an oval-round hole shape by means of the intermediate rolling unit, and then cutting heads and removing tails by a flying shear; and S3, feeding the intermediate-rolled round billets of about 870-1000 DEG C into a finish rolling unit for rolling, and rolling to a size close to that of a finished product by adopting a slitting hole shape by means of the finish rolling unit. According to the method, a non-heating low-temperature rolling technology is adopted, and steel billets do not need to be heated by a heating furnace in the non-heating low-temperature rolling technology, so that the investment of heating furnace devices and fuels is effectively saved, the energy consumption and the metal oxidation burning loss are reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of thread steel rolling, and more specifically relates to a method for producing 400-500 MPa high-strength anti-seismic thread steel by adopting non-heating low-temperature split rolling. Background technique [0002] Rebar is a common name for hot-rolled ribbed steel bars, which are widely used in civil engineering construction such as houses, bridges, and roads. The general production process of rebar is to use continuous casting to produce billet, and then after the billet is cooled to the outdoor natural temperature, the continuous casting billet is heated to about 1050-1200°C through a heating furnace, and then sent to the subsequent rolling production line for rolling . [0003] The disclosed prior art about the method for rolling rebar is as follows: [0004] (1) Chinese patent CN204338571U "Continuous casting-direct rolling device for producing rods, wires and profiles" introduces a set of continuous casting...

AI Technical Summary

Problems solved by technology

[0004] (1) Chinese patent CN204338571U "Continuous casting-direct rolling device for producing rods, wires and profiles" introduces a set of continuous casting machine, billet cutting device, roller table after cutting, fast heat preservation roller table and steel rolling production line, Mainly introduces the continuous casting machine, cutting device, thermal insulation roller table, billet off-line device, etc.; rolling equipment is not described