High-quality tool steel heat treatment steel strip and production method and application thereof

A heat treatment steel and production method technology, applied in the field of steel manufacturing, can solve the problems of increasing the grinding depth of semi-finished products, oxidation of the steel plate surface, and low airtightness, and achieve the effects of high flatness, saving production costs, and excellent mechanical properties

Inactive Publication Date: 2019-02-15
湖南华菱涟源钢铁有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Moreover, due to the large furnace capacity of the austenitizing heating furnace, the airtightness is not high, and even part of the quenching process adopts oil spraying and press quenching when exposed to air at high temperature. The above process steps make the surface of the steel plate more oxidized, and the semi-finished product needs to be enlarged in the future. In addition, because the quenching medium in the above process flow is mechanical oil, its maximum cooling capacity is mostly below 100°C / s, which is prone to quenching deformation

Method used

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  • High-quality tool steel heat treatment steel strip and production method and application thereof
  • High-quality tool steel heat treatment steel strip and production method and application thereof
  • High-quality tool steel heat treatment steel strip and production method and application thereof

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Effect test

Embodiment 1

[0050] The 75Cr1 cold-rolled tool steel strip is used as the raw material, loaded into the uncoiler, welded with the leader belt, and threaded into the continuous salt bath quenching-tempering line. The moving speed of the 75Cr1 cold-rolled tool steel strip is 1.0m / min. The temperature of the austenitizing heating furnace is 940°C, and the temperature of the salt bath is 280°C. After the 75Cr1 cold-rolled tool steel is taken out of the salt bath, it is blown to cool to 20-35°C. The 75Cr1 cold-rolled tool steel strip is heat-leveled at 450°C, and then enters the tempering furnace for tempering. Coils, high-quality tool steel heat-treated steel strips are obtained.

[0051] The specifications of the high-quality tool steel heat-treated steel strip are thickness 1.5mm×width 500mm, chemical composition and mass percentage content thereof are: C 0.772%, Si 0.235%, Mn 0.755%, P 0.014%, S 0.0037%, Alt. .0203%, Ca 0.0014%, and the rest are Fe and unavoidable impurities.

Embodiment 2

[0053] The SK4 cold-rolled tool steel strip is used as the raw material, loaded into the uncoiler, welded and combined with the leader belt, and threaded into the continuous salt bath quenching-tempering line. The moving speed of the SK4 cold-rolled tool steel strip is 1.4m / min. The temperature of the austenitizing heating furnace is 910°C, and the temperature of the salt bath is 290°C. After the 75Cr1 cold-rolled tool steel is taken out of the salt bath, it is blown to cool to 20-35°C. The SK4 cold-rolled tool steel strip is heat-leveled at 450°C, and then enters the tempering furnace for tempering. The tempering temperature is 480°C. After tempering, it is air-cooled to 20-35°C, wound and straightened on S rolls, Then it is coiled to obtain a high-quality tool steel heat-treated steel strip.

[0054] The specifications of the high-quality tool steel heat-treated steel strip are thickness 1.0mm×width 300mm, and the chemical composition and mass percentage thereof are: C 0.9...

Embodiment 3

[0056] The T8 cold-rolled tool steel strip is used as raw material, loaded into the uncoiler, welded and combined with the leader belt, threaded into the continuous salt bath quenching-tempering line, and the moving speed of the T8 cold-rolled tool steel strip is 0.8m / min. The temperature of the austenitizing heating furnace is 940°C, and the temperature of the salt bath is 280°C. After the 75Cr1 cold-rolled tool steel is taken out of the salt bath, it is blown to cool to 20-35°C. The T8 cold-rolled tool steel strip is heat-leveled at 450°C, and then enters a tempering furnace for tempering at a temperature of 480°C. After tempering, it is air-cooled to 20-35°C, wound and straightened on S rolls, Then it is coiled to obtain a high-quality tool steel heat-treated steel strip.

[0057] The specifications of the high-quality tool steel heat-treated steel strip are thickness 3.0mm×width 400mm, and the chemical composition and mass percentage thereof are: C 0.805%, Si 0.188%, Mn ...

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Abstract

The invention belongs to the technical field of steel manufacturing, and particularly relates to a high-quality tool steel heat treatment steel strip and a production method and application thereof. The production method of the high-quality tool steel heat treatment steel strip comprises the following steps that a cold-rolled tool steel strip serves as a raw material, heating is conducted in an austenitizing heating furnace, and then after salt bath quenching, hot leveling, tempering, cooling, straightening and coiling, the high-quality tool steel heat treatment steel strip is obtained. The produced high-quality tool steel heat treatment steel strip is uniform in mechanical property, has no obvious oxides, no decarbonization layer and no grain boundary oxidation layer on the surface, and is short in production cycle and low in production cost.

Description

technical field [0001] The invention belongs to the technical field of iron and steel manufacturing, and in particular relates to a high-quality tool steel heat-treated steel strip and its production method and application. Background technique [0002] At present, for the production of hardware tools such as knives and saw blades, the commonly used process is to first process a single piece of knives and saw blade blanks, and then perform heat treatment on an oil quenching line or a salt bath quenching line to produce semi-finished tool parts. The above process has the problems of high production cost and long production cycle; for example, saw blade manufacturers first use steel plates to blank into discs, and then perform quenching. After quenching, tens of hours of heavy pressure leveling are required. Tens of hours of tempering heat treatment, tens of hours of heavy pressure leveling after tempering, and surface grinding after leveling; the cost of heat treatment in thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/52C21D1/18
CPCC21D1/18C21D9/52C21D2211/002C21D2211/008
Inventor 曾斌李光辉刘旭辉严立新罗钢汪净
Owner 湖南华菱涟源钢铁有限公司
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