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Heat treatment method of steel belt for packages and steel belt for packages

A heat treatment method and packaging technology, applied in the field of packaging steel strips, can solve the problems of inability to break through the tensile strength of packaging steel strips, small elongation after breaking, etc. Effect

Active Publication Date: 2009-02-11
上海宝钢新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The first aspect of the purpose of the present invention is to propose a heat treatment method for packaging steel strips, so as to solve the technical problems that the tensile strength of packaging steel strips produced by the current heat treatment method cannot exceed 1250MPa, and the elongation after breaking is less than 6%.

Method used

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  • Heat treatment method of steel belt for packages and steel belt for packages
  • Heat treatment method of steel belt for packages and steel belt for packages
  • Heat treatment method of steel belt for packages and steel belt for packages

Examples

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Effect test

Embodiment 1

[0045] A carbon-manganese steel containing the following chemical composition is selected: C: 0.29%, Si: 0.24%, Mn: 1.33%, P: 0.015%, S: 0.007%, and the balance is Fe, and the percentages are weight percentages.

[0046] The above-mentioned carbon-manganese steel hot-rolled plate with a thickness of 2.0mm is selected as a raw material, and is pickled and cold-rolled into a steel strip of 0.9×199mm. The mechanical properties after cold-rolling are: tensile strength is 975MPa, and elongation is 6%. Then enter the equipment for carrying out the heat treatment method of the present invention, and carry out quenching and tempering treatment according to the heat treatment method of the present invention. The steel strip running speed in the whole heat treatment process is 17m / min, and it is heated to 860°C for austenitization. It is about 35.3s, the lead bath isothermal quenching temperature is 362°C, and the isothermal quenching time is about 24.7s. After water cooling at 60°C, it ...

Embodiment 2

[0049] A carbon-manganese steel containing the following chemical composition is selected: C: 0.29%, Si: 0.24%, Mn: 1.33%, P: 0.015%, S: 0.007%, and the balance is Fe, and the percentages are weight percentages.

[0050] The above-mentioned carbon-manganese steel hot-rolled plate with a thickness of 2.0mm is selected as a raw material, and is pickled and cold-rolled into a steel strip of 0.9×199mm. The mechanical properties after cold-rolling are: tensile strength is 975MPa, and elongation is 6%. Then enter the equipment for carrying out the heat treatment method of the present invention, carry out quenching and tempering treatment, the whole heat treatment process steel strip running speed 15m / min, be heated to 860 ℃ and carry out austenitization, holding time 40s, lead bath isothermal quenching temperature is 357 ℃, isothermal quenching time 28s, air cooling after water cooling at 60 ℃, and then the finished product is put into storage according to the traditional slitting an...

Embodiment 3

[0053] A carbon-manganese steel containing the following chemical composition is selected: C: 0.30%, Si: 0.27%, Mn: 1.50%, P: 0.012%, S: 0.009%, the balance is Fe, and the percentages are weight percentages.

[0054] The above-mentioned carbon-manganese steel hot-rolled plate with a thickness of 2.5mm was selected as a raw material, and was pickled and cold-rolled into a steel strip of 0.9×199mm. The mechanical properties after cold-rolling: the tensile strength was 970MPa, and the elongation was 7%. Then enter the equipment for carrying out the heat treatment method of the present invention, and carry out quenching and tempering treatment. The steel strip running speed is 17m / min in the whole heat treatment process, and it is heated to 860°C for austenitization. The holding time is about 35.3s, and the lead bath isothermal quenching temperature The temperature is 362°C, and the austempering time is about 24.7s. After water cooling at 60°C, it is air-cooled, and then the finish...

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Abstract

The invention relates to a heat treatment method of a steel strip for packaging, comprising the following steps: a) the steel trip is heated to the austenitizing temperature; b) isothermal quenching is carried out in molten lead; c) the lead is scraped off in a carbon tower; and d) the strip is cooled by water. The heat treatment method is characterized in that the temperature range of the isothermal quenching in the step b) is 355-365 DEG C and the isothermal quenching time is 21-28s. The invention further discloses a steel strip for packaging obtained by the heat treatment method. The components of the steel strip (by weight percentages) are as follows: 0.29-0.35% of C, 0.15-0.35% of Si, 1.20-1.55% of Mn, not more than 0.030% of P, not more than 0.030% of S and Fe. The heat treatment method solves the problems that tensile strength of the existing steel strips for packaging can not exceed 1250MPa, the elongation after fracture is less than 6%, and the two-phase region quenching profile of a sheet is poor.

Description

technical field [0001] The invention relates to a heat treatment method for a steel strip, in particular to a heat treatment method during the manufacture of a steel strip for packaging, and also relates to a steel strip for packaging manufactured by the heat treatment method. Background technique [0002] Packaging steel belt, also known as strapping or steel belt, is a narrow strip packaging material with high tensile strength and certain elongation. It is widely used in the packaging and bundling of steel industry, construction industry, non-ferrous metal industry, glass industry, machinery industry and other products. [0003] According to the classification in the European standard EN13246: 2001 edition, the highest tensile strength level of steel strips for packaging is 1250MPa, in "Table 7 Mechanical properties of steel strips" in China's ferrous metallurgy industry standard YB / T025-2002 steel strips for packaging The highest tensile strength level is 980MPa. The hi...

Claims

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Application Information

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IPC IPC(8): C21D9/52C21D1/18C22C38/04
CPCY02P10/20
Inventor 韩建春俞晓峰袁洁敏王强曹栋杰马科
Owner 上海宝钢新材料技术有限公司
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