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Non-quenched and non-tempered 980 MPa grade high-strength strapping steel and production method thereof

A production method, 980mpa technology, applied in the field of steel strip raw materials, can solve the problems of high energy consumption and high cost, complex equipment, environmental pollution and other problems in the production of high-strength strapping, and achieve the elimination of quenching and tempering process, reduce energy consumption and cost, and improve performance Good results

Active Publication Date: 2016-11-16
TANGSHAN STAINLESS STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Non-quenched and non-tempered 980 MPa grade high-strength strapping steel and production method thereof
  • Non-quenched and non-tempered 980 MPa grade high-strength strapping steel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: The specific process of the non-quenched and tempered 980MPa grade high-strength strapping steel is as follows.

[0024] (1) Steelmaking process: The weight percentage of the chemical composition of the molten steel is: C 0.19%, Mn 1.23%, S 0.003%, P 0.017%, Si 0.03%, Als 0.025%, N 0.0037%, the rest is iron and non Avoid impurities.

[0025] (2) Heating process: the slab is heated to 1200±10°C.

[0026] (3) Hot rolling process: the starting temperature of the rough rolling of the slab is controlled at 1100±10°C; the starting temperature of the finish rolling is 1030±10°C, the final rolling temperature is 835±10°C, and the thickness of the rolled steel plate is 3.0mm.

[0027] (4) Cooling process: before the steel plate enters laminar flow cooling, the temperature is 815-830°C, cooled at 100°C / s to 700±10°C, air-cooled for 3s; continue to cool at 100°C / s to 430°C±10°C coiled. The mechanical properties of the obtained hot-rolled steel strip are tested, an...

Embodiment 2

[0029] Embodiment 2: The specific process of the non-quenched and tempered 980MPa grade high-strength strapping steel is as follows.

[0030] (1) Steelmaking process: The weight percentage of the chemical composition of the molten steel is: C 0.18%, Mn 1.26%, S 0.002%, P 0.017%, Si 0.09%, Als 0.030%, N 0.0034%, the rest is iron and non Avoid impurities.

[0031] (2) Heating process: the slab is heated to 1200±10°C.

[0032] (3) Hot rolling process: the starting temperature of the rough rolling of the slab is controlled at 1100±10°C; the starting temperature of the finish rolling is 1030±10°C, the final rolling temperature is 835±10°C, and the thickness of the rolled steel plate is 2.8mm.

[0033] (4) Cooling process: before the steel plate enters laminar flow cooling, the temperature is 815-830°C, cooled at 110°C / s to 700±10°C, air-cooled for 2s; continue to cool at 120°C / s to 430°C±10°C coiled. The mechanical properties of the obtained hot-rolled steel strip are tested, an...

Embodiment 3

[0035] Embodiment 3: The specific process of the non-quenched and tempered 980MPa grade high-strength strip steel is as follows.

[0036] (1) Steelmaking process: The weight percentage of the chemical composition of the molten steel is: C 0.17%, Mn 1.27%, S 0.003%, P 0.018%, Si 0.15%, Als 0.039%, N 0.0032%, the rest is iron and non Avoid impurities.

[0037] (2) Heating process: the slab is heated to 1200±10°C.

[0038] (3) Hot rolling process: the starting temperature of the rough rolling of the slab is controlled at 1100±10°C; the starting temperature of the finish rolling is 1030±10°C, the final rolling temperature is 830±10°C, and the thickness of the rolled steel plate is 3mm.

[0039] (4) Cooling process: before the steel plate enters laminar flow cooling, the temperature is 815-830°C, cooled at 110°C / s to 700±10°C, air-cooled for 2.2s; continue to cool at 120°C / s to 430°C±10°C Do coiling. The mechanical properties of the obtained hot-rolled steel strip are tested, an...

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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 strap steel and a production method thereof. Background technique [0002] Steel straps (referred to as straps), usually refer to steel straps used for industrial packaging, and are widely used in industrial fields such as steel, non-ferrous metals, papermaking, glass, building materials, tobacco, and textile processing. At present, my country's iron and steel industry is the industry that uses the most strapping products and has the highest load safety rating. It is mainly used for steel rolling and finished product packaging units in steel manufacturing. On the one hand, with the rapid development of my country's iron and steel industry in recent years, and the iron and steel enterprises in developed countries have increased the packaging of steel coils to the level of "guaranteeing safe storage and transportation, and improvin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/02
CPCC21D8/0226C21D8/0236C21D8/0278C22C38/001C22C38/02C22C38/04C22C38/06
Inventor 张玉文贾丽慧陈秋良张春花刘爱平任振远吕苗苗方锡婕张旭王肖杰
Owner TANGSHAN STAINLESS STEEL
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