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Method for preventing buckling and deviation of strip steel with thickness not larger than 0.5 mm in continuous annealing furnace

A continuous annealing furnace and strip steel technology, applied in furnaces, heat treatment furnaces, furnace types, etc., to reduce furnace shutdown accidents, optimize heating process temperature, and facilitate adjustment.

Active Publication Date: 2020-07-14
新余钢铁股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Thin-gauge (thickness not greater than 0.5mm) cold-rolled steel strip bending and deviation in continuous annealing furnace is a problem. At present, there is no relevant prevention of thin-gauge steel strip thickness not greater than 0.5mm in continuous annealing furnace. Report on the technical solution of the deviation control method

Method used

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  • Method for preventing buckling and deviation of strip steel with thickness not larger than 0.5 mm in continuous annealing furnace
  • Method for preventing buckling and deviation of strip steel with thickness not larger than 0.5 mm in continuous annealing furnace
  • Method for preventing buckling and deviation of strip steel with thickness not larger than 0.5 mm in continuous annealing furnace

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Effect test

Embodiment 1

[0050] Methods to prevent bending and deviation in the continuous annealing furnace of strip steel with a thickness not greater than 0.5mm:

[0051] The target steel type is XGMB (strip steel for deep drawing), the product specification thickness×width is 0.5×1250mm, according to the production plan, arrange 2 rolls of transition material in advance, the steel type is DC01, and the product specification thickness×width is 0.6×1000mm. Since it is a transition from narrow front to wide rear and the width difference is ≥100mm, use crescent scissors to punch out the transition area at the rear half of the crescent at the weld to avoid stress concentration in the transition area and increase the risk of buckling.

[0052] Heating temperature control: The plate temperature in the heating section and the soaking section is gradually increased from 780°C to 820°C required by the target strip during the production of the 2-coil preceding transition material DC01 and remains in a stable ...

Embodiment 2

[0061] Methods to prevent bending and deviation in the continuous annealing furnace of strip steel with a thickness not greater than 0.5mm:

[0062] The target steel grade is DC03 (strip steel for deep drawing), and the product specification is 0.5×1000mm. According to the production plan, 3 rolls of transition material are arranged in advance. The steel grade is DC01, and the product specification is 0.45×1100mm.

[0063] Heating temperature control: The plate temperature in the heating section and soaking section is gradually increased from 780°C to 810°C required by the target strip during the production of 3 rolls of transition material DC01 and remains stable.

[0064] Tension control mode: After the target strip enters the furnace, it is changed from the secondary value tension mode control to the manual tension mode control. The tension is gradually revised to +19.06% of the secondary value. Before the head of the target strip is about to pass through the 1# aging secti...

Embodiment 3

[0072] Methods to prevent bending and deviation in the continuous annealing furnace of strip steel with a thickness not greater than 0.5mm:

[0073] The target steel type is XGMB (strip steel for deep drawing), the product specification is 0.4×1000mm, according to the production plan, arrange 2 rolls of transition material in advance, the steel type is DC01, and the product specification is 0.4×1000mm.

[0074] Heating temperature control: The plate temperature in the heating section and the soaking section is gradually increased from 780°C to 815°C required by the target strip during the production of the 2-coil preceding transition material DC01 and remains in a stable state.

[0075] Tension control mode: After the target strip enters the furnace, it is changed from the secondary value tension mode control to the manual tension mode control. The tension is gradually modified to +15% of the secondary value. Before the head of the target strip is about to pass through the 1# ...

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Abstract

The invention provides a method for preventing buckling and deviation of strip steel with the thickness not larger than 0.5 mm in a continuous annealing furnace. According the method, tension of a heating section and a soaking section is controlled to be 6.48-8.64 N / square milimeter, the temperature is controlled to be 770-830 DEG C, the tension of the strip steel in a cold area of the continuousannealing furnace is controlled to be 6.21-8.464 N / square milimeter, and the plate temperature of a final cooling section is controlled to be 170-180 DEG C. Compared with the prior art, the method hasthe advantages that the phenomena of buckling and deviation of the thin-gauge strip steel with the thickness not larger than 0.5 mm in the continuous annealing process are prevented through the measures of increasing the tension of a hot area in the furnace, reducing the tension of the cold area, reducing the plate temperature of the hot area, increasing the plate temperature of a final cooling section and the like, the one-time hit rate of products is increased, and smooth production is ensured.

Description

technical field [0001] The invention belongs to the technical field of continuous annealing, and relates to a method for preventing cold-rolled strip steel from bending and deviation in a continuous annealing furnace, in particular to a method for preventing bending and deviation in a steel strip with a thickness not greater than 0.5 mm. Background technique [0002] The continuous annealing furnace is usually divided into 8 different areas, which are preheating section (JPF), heating section (RTF), soaking section (SF), slow cooling section (SCS), rapid cooling section (RCS), 1# aging section Section (1#OA), 2# aging section (2#OA), final cooling section (FCS), the strip tension in each area is adjusted by the tensiometer roller set between the areas. During the high-speed continuous annealing process of cold-rolled strip steel, affected by factors such as strip steel shape, furnace tension, transition between front and rear varieties and specifications, temperature, etc., ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/573C21D9/56C21D1/26C21D11/00
CPCC21D1/26C21D9/564C21D9/573C21D11/00C21D11/005
Inventor 钟海清范超黄丽芳谢芳罗庆华易新平王金云陈渊邱明罗辉郭赞杨
Owner 新余钢铁股份有限公司