Method for producing high-strength and elongation product automobile steel plate by continuous annealing technology

A technology of high-strength plastic product and annealing process, which is applied in the field of continuous annealing process to produce high-strength plastic-product automotive steel plates, to achieve the effect of accelerating enrichment speed, avoiding coarsening and good chemical stability

Active Publication Date: 2013-02-13
CENT IRON & STEEL RES INST
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Problems solved by technology

That is, the longer the annealing time, the better its performance, but in the industrialized continuous annealing production line, due to the limitation of the length of the production line, the annealing time is at most no more than 10 minutes, so it is difficult to obtain a sufficient amount of stable azolium by short-term continuous annealing. Tensile structure

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  • Method for producing high-strength and elongation product automobile steel plate by continuous annealing technology
  • Method for producing high-strength and elongation product automobile steel plate by continuous annealing technology
  • Method for producing high-strength and elongation product automobile steel plate by continuous annealing technology

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Embodiment

[0028] The test of this embodiment adopts the three chemical components of A, B, and C shown in Table 1, which are smelted by induction furnace, poured into ingots, hot forged into 50mm thick slabs, and then rolled to 6mm hot slabs by pilot single-stand rolling mill. Rolled coils, control the final rolling temperature at 750 o About C, coiling temperature > 600 o C. Put it into the holding furnace for 5 hours and then cool it to room temperature, then cold roll the hot rolled coil to 2mm through the cold rolling mill. Subsequent annealing of the cold-rolled sheet is done on an annealing simulator in the laboratory. Cold-rolled steel plate first in 780 o C annealed for 6 minutes to austenitize and dissolve carbides, according to not less than 20 o C / s is cooled to different temperatures, and the pretreatment is carried out according to the eight pretreatment processes shown in Table 2. 550 of them o C and the room temperature insulation process are comparative processes. ...

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Abstract

The invention provides a method for producing a high-strength and elongation product automobile steel plate by a continuous annealing technology, belonging to the technical field of an automobile steel plate. The method comprises the following steps: based on the reasonable chemical component design and the alloy element partition, firstly, obtaining transition carbide with fine dispersion distribution by a cold rolled plate coil importantly, and promoting austenite inverse phase transformation through the solid solution of the fine carbide through two-phase region annealing, to obtain more and stable austenite phases to be remained. According to the method, the strict technological conditions for forming the finely-dispersed carbide and the strict interval for carrying out the technological parameters of the two-phase region annealing are given, so that the method has the advantages that the continuous annealing plate coil which is even in performance and good in surface quality can be obtained due to the short-time annealing of the existing continuous annealing production line of a steel factory, wherein the strength of the steel plate is 0.6-1.2GPa, the percentage elongation of the steel plate is 45-20%, and the product of strength and elongation is 25-40GPa%.

Description

technical field [0001] The invention belongs to the technical field of production of steel plate coils for automobiles, and in particular provides a method for producing steel plates for high-strength plastic products by a continuous annealing process. Production of high-strength plastic product steel sheet coils for automobiles through short-time continuous annealing (≤10 minutes) in the existing continuous annealing production line of the iron and steel enterprise. technical background [0002] High-strength and high-plasticity materials have always been the persistent pursuit of material workers, especially with the improvement of automotive lightweight and safety requirements, steel for automotive structural parts is required to have a high strength-plastic product (the product of tensile strength and elongation). The strength and plasticity of the first generation of automotive steel is at the level of 10-20GPa%, which can no longer meet the dual requirements of lightwe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/00C21D8/02
Inventor 罗海文董瀚干勇翁宇庆时捷
Owner CENT IRON & STEEL RES INST
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