Non-quenched and tempered 980mpa grade high-strength strap steel and its production method

Abstract

The invention discloses non-quenched and non-tempered 980 MPa grade high-strength strapping steel and a production method thereof. The production method comprises work procedures of hot rolling, cooling, cold rolling and bluing. The non-quenched and non-tempered 980 MPa grade high-strength strapping steel is characterized in that chemical components of the non-quenched and non-tempered 980 MPa grade high-strength strapping steel comprise, by weight percentage, 0.17%-0.23% of C, 1.15%-1.35% of Mn, smaller than or equal to 0.35% of Si, smaller than or equal to 0.015% of S, smaller than or equal to 0.025% of P, larger than or equal to 0.015% of Als, smaller than or equal to 0.0060% of N and the balance iron and inevitable impurities. According to the method, medium low C is adopted, compared with conventional Mn component design, by means of control over a cooling path of the cooling work procedure, the partition of C in the phase change process of the steel is adjusted, medium temperature reeling is controlled, the pearlite transformation organization conversion is avoided, a ferrite bainite organization with the performance better than that of ferrite pearlite can be obtained, and ferrite bainite steel has high tensile strength, good uniform elongation performance and high n value. By means of the method, the high-strength strapping steel with the tensile strength larger than or equal to 980 Mpa and the elongation rate A30 larger than or equal to 10% can be obtained.

Description

Technical field [0001] The invention relates to a steel strip raw material, in particular to a non-quenched and tempered 980MPa grade high-strength strapping steel and a production method thereof. Background technique [0002] Steel strapping (abbreviated as strapping), usually refers to the steel belt used for industrial packaging, and is widely used in industrial fields such as steel, non-ferrous metals, papermaking, glass, building materials, tobacco and textile processing. At present, my country's steel industry is the industry with the most strapping products and the highest load-carrying safety rating. It is mainly used for steel rolling and finished product packaging units for steel manufacturing. On the one hand, with the rapid development of my country’s steel industry in recent years, coupled with the fact that steel companies in developed countries have increased the packaging of steel coils to the level of “guaranteeing safe storage and transportation, and upgrading p...

AI Technical Summary

Problems solved by technology

Due to the complexity and high cost of the equipment required for the quenching and tempering process; at the same time, lead baths will cause serious environmental pollution, and some developed countries have begun to ban their use

[0007] Generally speaking, the production of medium and low-strength straps only needs to use carbon structural steel, which can be completed through work hardening; while the production of high-strength straps with a tensile strength of 950MPa requires the use of low-alloy steel, alloy structural steel or high-quality carbon steel. Structural steel can only be completed by quenching and tempering at medium temperature or austempering; this will result in higher energy consumption and cost for the production of high-strength strapping

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