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Precise control production method of alloyed hot-dip galvanized IF steel coating for automobile outer panels

A production method and alloying technology, applied in hot-dip galvanizing process, metal material coating process, coating, etc., can solve problems such as dezincification quality objections, achieve the goals of reducing regular calibration, high adjustment efficiency, and reducing production difficulty Effect

Active Publication Date: 2022-03-15
武汉钢铁有限公司
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

When the structure of the coating is not controlled properly, it is very easy to have objections to the quality of dezincification

Method used

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  • Precise control production method of alloyed hot-dip galvanized IF steel coating for automobile outer panels
  • Precise control production method of alloyed hot-dip galvanized IF steel coating for automobile outer panels
  • Precise control production method of alloyed hot-dip galvanized IF steel coating for automobile outer panels

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Embodiment Construction

[0086] The present invention will be described in further detail below in conjunction with specific embodiments, so that those skilled in the art can understand.

[0087] Each embodiment of the present invention is produced according to the following steps:

[0088] The method includes a smelting process, a hot rolling process, an acid rolling process, a galvanizing process, an alloying process, and a skin pass process, wherein,

[0089]1) Smelting process: Select different IF steel components for smelting according to user needs, and strictly control the content of P and S elements, of which P≤0.015%, S≤0.012%;

[0090] 2) Hot rolling: during the hot rolling process, the heating temperature is 1200-1230°C, and the soaking time is 120-160 minutes; at the same time, the phosphorus removal water is fully opened during the rough rolling and finishing rolling processes;

[0091] 3) Pickling: the pickling speed is less than or equal to 160m / min, and the flatness of the plate is ke...

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Abstract

The invention discloses a method for precisely controlling the coating of alloyed hot-dip galvanized IF steel for automobile outer panels. The method first selects different IF steel components for smelting according to user requirements. During the hot rolling process, the heating temperature is 1200-1230 ℃, the soaking time is 120-160 minutes; during the pickling process, the pickling speed is less than or equal to 160m / min, the flatness of the plate is kept within 0-3mm, and the temperature of the zinc solution during annealing and galvanizing is 455-458℃, effective The Al content is 0.11%-0.12%, the temperature of the zinc pot is 450-460°C, and the coating structure is directly controlled by the alloying induction heating power. The invention directly controls the alloying power to realize the precise control of the coating phase structure of the GA outer plate, which not only has higher adjustment efficiency, but also reduces the regular calibration of the alloying furnace plate thermometer and reduces the difficulty of on-site production.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a method for precisely controlling the production of alloyed hot-dip galvanized IF steel coatings for automobile outer panels. Background technique [0002] Alloyed galvanized IF steel is widely used in stamping parts of automobile outer panels due to its excellent formability and weldability. Since different automotive outer panel parts have different requirements on the structure of the alloyed hot-dip galvanized coating, the production control is also different. Therefore, it is particularly important to realize the precise control of the coating on demand. [0003] Usually, IF steel will add Ti element or Nb element to fix interstitial atoms. However, the cost of Nb element is relatively high. For cost considerations, steel mills mostly use two types of IF steels: pure Ti system without Nb and Nb-Ti system containing Nb. Due to the different diffusion rates of Nb and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C23C2/06C23C2/40C23C2/28C22C38/02C22C38/04C22C38/06C22C38/14C22C38/12
CPCC21D8/0226C21D8/0236C23C2/06C23C2/40C23C2/28C22C38/004C22C38/02C22C38/04C22C38/06C22C38/14C22C38/12
Inventor 杜小峰陈园林杜蓉杨芃杨奕周文强胡宽辉
Owner 武汉钢铁有限公司
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