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Accurate control production method of alloyed hot-galvanized IF steel clad layer for automotive outer plate

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

Active Publication Date: 2021-01-22
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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  • Accurate control production method of alloyed hot-galvanized IF steel clad layer for automotive outer plate
  • Accurate control production method of alloyed hot-galvanized IF steel clad layer for automotive outer plate
  • Accurate control production method of alloyed hot-galvanized IF steel clad layer for automotive outer plate

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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 an accurate control production method of an alloyed hot-galvanized IF steel clad layer for an automotive outer plate. According to the method, different series of IF steel components are firstly selected according to user requirements to smelt; in a hot rolling process, a heating temperature is 1,200 to 1,230 DEG C, and a soaking time is 120 to 160 minutes; in an acid rolling process, an acid pickling speed is smaller than or equal to 160 m / min, and the unevenness of a plate shape is maintained within 0 to 3 mm; during annealing and galvanization, the temperature of molten zinc is 455 to 458 DEG C, an effective Al content is 0.11% to 0.12%, and the temperature of a zinc entry pot is 450 to 460 DEG C; and a clad layer structure is directly controlled by alloying induction heating power. According to the method, the accurate control of the phase structure of the clad layer on the GA outer plate is achieved by directly utilizing and controlling the alloying power;and not only is the regulation efficiency higher, but also the periodic calibration of a plate thermometer for an alloying furnace is reduced and the field production difficulty is lowered.

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 Applications(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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