Method for improving the plastic strain ratio r value of cold-rolled deep-punching steel

A technology of plastic strain ratio and punching steel, which is applied in the field of metallurgical technology, can solve the problems of product scrapping, low product qualification rate, fracture, etc., achieve the effects of low cost, increase production qualification rate, and increase the plastic strain ratio r value

Inactive Publication Date: 2019-11-26
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing public cold-rolled deep-drawing steel material standards require that the r value is greater than 1.6, and cold-rolled deep-drawing steel with a lower r value often breaks during component processing, causing the product to be scrapped and the product qualification rate is low

Method used

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  • Method for improving the plastic strain ratio r value of cold-rolled deep-punching steel
  • Method for improving the plastic strain ratio r value of cold-rolled deep-punching steel

Examples

Experimental program
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Embodiment 1

[0051] Embodiment 1, the preparation of cold-rolled deep-drawn steel

[0052] The preparation of the cold-rolled deep-drawing steel of this embodiment adopts the following steps:

[0053] Desulfurization pretreated molten iron is decarburized by converter smelting, RH refining is carried out to obtain molten steel, the molten steel is subjected to continuous casting to obtain slabs, and the slabs are subjected to hot rolling process to obtain hot-rolled steel coils. The rolling temperature is 927°C, the coiling temperature is 722°C, and the thickness of the hot coil is 3.5mm; the hot-rolled steel coil is pickled to remove scale and then cold-rolled. The thickness of the coil is 0.8mm, and the cold-rolled steel coil is obtained; the cold-rolled steel coil is subjected to bell annealing, the annealing temperature is 720°C, the annealing time is 13h, the slow cooling time is 6h, and the furnace temperature is 78°C; finally, after the smoothing process, the flattening elongation i...

Embodiment 2

[0055] The preparation of the cold-rolled deep-drawing steel of this embodiment adopts the following steps:

[0056] Desulfurization pretreated molten iron is decarburized by converter smelting, RH refining is carried out to obtain molten steel, the molten steel is subjected to continuous casting to obtain slabs, and the slabs are subjected to hot rolling process to obtain hot-rolled steel coils. The rolling temperature is 915°C, the coiling temperature is 718°C, and the thickness of the hot coil is 4.5mm. The thickness of the coil is 1.0mm, and the cold-rolled steel coil is obtained; the cold-rolled steel coil is subjected to bell annealing, the annealing temperature is 720°C, the annealing time is 13h, the slow cooling time is 6h, and the furnace temperature is 75°C; finally, after the smoothing process, the flattening elongation is 0.6% obtains the cold-rolled deep-drawing steel described in the present invention;

Embodiment 3

[0058] The preparation of the cold-rolled deep-drawing steel of this embodiment adopts the following steps:

[0059] Desulfurization pretreated molten iron is decarburized by converter smelting, RH refining is carried out to obtain molten steel, the molten steel is subjected to continuous casting to obtain slabs, and the slabs are subjected to hot rolling process to obtain hot-rolled steel coils. The rolling temperature is 930°C, the coiling temperature is 726°C, and the thickness of the hot coil is 5.5mm; the hot-rolled steel coil is pickled to remove scale and then cold-rolled. The thickness of the coil is 1.5mm, and the cold-rolled steel coil is obtained; the cold-rolled steel coil is subjected to bell annealing, the annealing temperature is 730°C, the annealing time is 15h, the slow cooling time is 6h, and the furnace temperature is 80°C; finally, after the smoothing process, the flattening elongation is 0.6% obtains the cold-rolled deep-drawing steel described in the pres...

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Abstract

The invention discloses a method for improving the plastic strain ratio r value of cold-rolled deep-punching steel. The method comprises the following steps of carrying out cold rolling by adopting acold rolling reduction rate of 66.67% - 77.78%, and then carrying out batch annealing and leveling to obtain the cold-rolled deep-punching steel. According to the method for improving the plastic strain ratio r value of the cold-rolled deep-punching steel, the method of optimizing the production process is adopted, so that the obtained cold-rolled deep-punching steel has a good plastic strain ratio r value, the stamping and drawability performance of a steel plate material is improved, the probability of breakage of the steel material in the stamping and drawability processes is reduced, and the production qualified rate is improved; and according to the method for improving the plastic strain ratio r value of the cold-rolled deep-punching steel, improvement is carried out on the basis ofan original steel production line, technological parameter control is optimized, and industrial production improvement is facilitated.

Description

technical field [0001] The invention relates to the technical field of metallurgical technology, in particular to a method for increasing the plastic strain ratio r value of cold-rolled deep-drawing steel. Background technique [0002] At present, with the continuous upgrading of cold-rolled deep-drawn steel products used in automobile manufacturing and home appliance industries, the design appearance and internal structure of products are becoming more and more complex, with large deformation, complex deformation, high stamping efficiency, and fast stamping speed. The stamping performance requirements of stamping steel are getting higher and higher. The American ASTM-E26 standard committee has conducted 1000 actual punching tests on 18 groups of steels under the conditions of strict rolling, strict auxetic and the complex combination of the two. The results show that: components mainly auxetic require cold rolling and deep drawing Steel materials have a high n value; cold-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D8/04C22C33/04C22C38/14C22C38/12C22C38/06C22C38/04C22C38/02
CPCC21D1/26C21D8/0405C21D8/0426C21D8/0436C21D8/0442C22C33/04C22C38/001C22C38/002C22C38/004C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 尚秀廷
Owner BAOTOU IRON & STEEL GRP
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