Limit-specification IF steel and furnace zone through plate method thereof

A technology with extreme specifications and through-board, applied in furnaces, heat treatment furnaces, furnace types, etc., it can solve the problems that the shape quality of the annealed plate cannot meet the needs of customers, the occurrence of high temperature buckling, and the impact of production rhythm, etc., to improve the quality of annealed shape. , Reduce the temperature difference of the roller body, and achieve the effect of stable passing through the plate

Active Publication Date: 2012-10-10
SHOUGANG CORPORATION
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Problems solved by technology

[0003] The main thickness range of automobile sheets is 0.7-1.2mm, and the width range is 1400-1800mm, mainly EDDQ/SEDDQ-IF steel sheets. The main characteristics of automobile sheets are low carbon content (C≤0.002%), with good depth However, the IF steel with thin and wide specifications is prone to high-temperature warping in the furnace, which cannot realize the high-speed, high-efficiency, and high-quality production of the cont

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  • Limit-specification IF steel and furnace zone through plate method thereof
  • Limit-specification IF steel and furnace zone through plate method thereof
  • Limit-specification IF steel and furnace zone through plate method thereof

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Embodiment Construction

[0015] The present invention provides a method for passing plates in the furnace area of ​​limit specification IF steel, the composition of which is: C≤0.0015, Si≤0.03, Mn: 0.1-0.14, P≤0.01, S≤0.01, Alt: 0.02- 0.045, Ti: 0.06-0.08, N≤0.004, balance: Fe.

[0016] By doing the following specific action points:

[0017] 1. First confirm the production plan. The annealing temperature, thickness, and width transitions of thin and wide materials should be as small as possible. Concentrate production scheduling and production of thin and wide automotive sheets as much as possible, and do not produce thin and wide sheets under the condition that continuous transitions lead to unstable furnace conditions.

[0018] 2. Before thin and wide materials enter the furnace, the rolls should be changed in advance when transitioning from narrow to wide. When the working rolls are chrome-plated, the rolls can be changed 20 kilometers in advance to create a stable furnace condition to ensure smo...

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Abstract

The invention discloses a limit-specification IF (interstitial-free) steel and a furnace zone through plate method thereof, belonging to the technical field of cold rolled sheet strip annealing. The IF steel comprises the following components in percentage by weight: not more than 0.0015 of C, not more than 0.03 of Si, 0.1-0.14 of Mn, not more than 0.01 of P, not more than 0.01 of S, 0.02-0.045 of Alt, 0.06-0.08 of Ti, not more than 0.004 of N, and the balance of Fe; and the heating zone temperature is 815-825 DEG C, the slow cooling zone temperature is 620-630 DEG C, the fast cooling zone temperature is 340-350 DEG C, and the overaging temperature is 350-360 DEG C. According to the invention, by optimizing furnace zone tension, lowering furnace zone temperature, reducing roller body temperature difference, preventing steel strip from off-tracking and other methods, furnace zone stable through plate of automobile plates with thin wide specification is realized and the annealing plate shape quality is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of cold-rolled strip annealing, and relates to an IF steel with a limit specification and a method for passing the strip in a furnace area. Background technique [0002] IF steel, that is, interstitial atom-free steel, sometimes called ultra-low carbon steel, has excellent deep drawing properties, and now the elongation and r value can reach 50% and more than 2.0, and it has been widely used in the automotive industry. In IF steel, due to the low content of C and N, a certain amount of titanium (Ti), niobium (Nb) and other strong carbon-nitrogen compound forming elements are added to completely fix the carbon, nitrogen and other interstitial atoms in ultra-low carbon steel as Carbonitrides, resulting in clean ferritic steel without interstitial atoms, that is, ultra-low carbon interstitial atom-free steel. [0003] The main thickness range of automobile sheets is 0.7-1.2mm, and the width range is 1400-1800m...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D1/26C21D9/48C21D9/52C21D9/56
Inventor 刘丹张民宋伟闻达杨小勇任君茹
Owner SHOUGANG CORPORATION
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