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Continuous annealing production method for thin cold-rolled lace-rolled hard steel plate

A production method and technology of continuous annealing furnace, applied in furnaces, heat treatment equipment, heat treatment furnaces, etc., can solve the problems of broken strip, difficult to stabilize production, easy deviation, etc. Effect

Active Publication Date: 2016-07-20
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a continuous annealing production method of thin-gauge cold-rolled lace-rolled hard steel plate, which solves the problem that the existing 0.17-0.20 mm thick cold-rolled lace-rolled hard steel plate is difficult to stabilize when annealing with a continuous annealing unit due to the presence of lace plate shape defects Production and technical problems of easy deviation and broken belt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A vertical continuous annealing furnace unit is used to uncoil, clean, anneal, smooth, and coil a cold-rolled lace-rolled hard steel plate with a plate thickness of 0.186 mm to obtain an electroplated tin substrate. Among them, the chemical composition weight of the cold-rolled lace-rolled hard steel plate The percentages are: C: 0.104%, Si: 0.0245%, Mn: 0.3816%, P: 0.0125%, S: 0.0024%, Cu: 0.0276%, Alt: 0.0562%, N: 0.0066%, and the balance is Fe and unavoidable impurity elements; the yield strength of the cold-rolled lace-rolled hard steel plate is 854MPa, the tensile strength is 935MPa, the substrate hardness HR30T is 83, and the substrate surface roughness Ra0.45um;

[0033] The strip unit tension of the cold-rolled lace-rolled hard steel plate in the cleaning section of the vertical continuous annealing furnace is from 43.02N / mm when there is no lace plate shape defect 2 Control drop to 38.80N / mm 2 ;

[0034] Eight minutes before the cold-rolled lace-rolled hard s...

Embodiment 2

[0038] Use a vertical continuous annealing furnace unit to uncoil, clean, anneal, smooth, and coil a cold-rolled lace-rolled hard steel plate with a plate thickness of 0.171mm to obtain an electroplated tin substrate; wherein, the chemical composition of the cold-rolled lace-rolled hard steel plate is For: C: 0.0976%, Si: 0.0137%, Mn: 0.3899%, P: 0.0138%, S: 0.0079%, Cu: 0.0219%, Alt: 0.0546%, N: 0.00608%, the balance is Fe and unavoidable Impurity elements; the yield strength of the cold-rolled lace-rolled hard steel plate is 886MPa, the tensile strength is 976MPa, the substrate hardness HR30T is 85, and the substrate surface roughness is 0.40um.

[0039] The strip unit tension of the cold-rolled lace-rolled hard steel plate in the cleaning section of the vertical continuous annealing furnace is from 43.02N / mm when there is no lace plate shape defect 2 Control drop to 35.62N / mm 2 ;

[0040] 10 minutes before the cold-rolled lace-rolled hard steel plate enters the vertical c...

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Abstract

The invention relates to a continuous annealing production method for a thin cold-rolled lace-rolled hard steel plate. By the adoption of the continuous annealing production method for the thin cold-rolled lace-rolled hard steel plate, the technical problem that due to the fact that the lace plate shape defect of existing 0.17-0.20 mm thick cold-rolled lace-rolled hard steel plate exists, stable production is difficult when annealing is conducted through a continuous annealing unit is solved. According to the technical scheme, a cold-rolled lace-rolled hard steel plate roll which is 0.17-0.20 mm thick is uncoiled, cleaned, annealed, flattened and coiled through a vertical continuous annealing furnace unit, and tin electroplating substrates are obtained; the unit tension of strip steel of a cleaning section is 28.05-38.89 N / mm<2>; the speed of the strip steel of a central section of the unit is decreased to 350-500 mpm and the temperature of the strip steel of a heating section and a uniform heating section in the annealing furnace is decreased to 585-605 DEG C 5-10 minutes before the cold-rolled lace-rolled hard steel plate roll enters the vertical continuous annealing furnace unit; the annealing time is 54-79 S; and the unit tension of the strip steel in the uniform heating section is 11.4-15.0 N / mm<2>.

Description

technical field [0001] The invention relates to a continuous annealing production method of cold-rolled steel plates, in particular to a continuous annealing production method of thin-gauge cold-rolled lace-rolled hard steel plates, and belongs to the technical field of iron-based alloys. Background technique [0002] Iron and steel enterprises use continuous annealing units to recrystallize and anneal the work-hardened strip steel after cold rolling to improve the microstructure and improve the plasticity and stamping formability of the strip steel. However, the high-speed thin-strip continuous annealing unit is very sensitive to the shape of the incoming strip due to the fast running speed of the strip in the annealing furnace. If the shape of the incoming strip exceeds a certain level, it is very easy to cause stripping. Steel deviation, and even lead to broken belt accidents. This causes a great loss to the continuous annealing unit in terms of production capacity, fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/56C21D1/26
Inventor 刘洪王涛陈维晋曹博蕊王海军徐烨明
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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