Method of producing thin hot-formed steel based on CSP (chip scale package) process

A hot-formed steel, thin-gauge technology, applied in the direction of rolling mill control devices, metal rolling, manufacturing tools, etc., can solve the problems of warping, folding, tailing, poor plastic deformation ability of steel, and elongation of thin hot-formed steel It can improve the quality of the plate shape, reduce the production cost and improve the surface quality of the product.

Active Publication Date: 2018-01-30
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

Although the tensile strength of the thin hot-formed steel obtained by this method is high, the elongation of the thin hot-formed steel is low, and the plastic deformation capacity of the steel is poor; and the invention is mainly aimed at product strength and thickness indicators, for The control of the product in the production process is less involved. In fact, accidents such as warping, folding, and tailing are extremely prone to occur during the production process of ultra-thin strip steel of 1.0 to 3.0 mm, resulting in changes in the quality of scrap steel and surface quality, and bringing major losses to the enterprise. economic loss

Method used

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  • Method of producing thin hot-formed steel based on CSP (chip scale package) process
  • Method of producing thin hot-formed steel based on CSP (chip scale package) process
  • Method of producing thin hot-formed steel based on CSP (chip scale package) process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0032] The thin gauge hot formed steel in the following embodiments is manufactured as follows:

[0033] 1) Steelmaking: converter smelting and refining outside the furnace to obtain refined molten steel;

[0034] 2) Continuous casting: The refined molten steel is cast into a billet on the continuous casting machine on the CSP thin slab continuous casting and rolling production line. The thickness of the cast billet is controlled to 70mm in the pouring stage, and it is reduced to 52-60mm by the liquid core, and then drawn Speed ​​control at 3.5~4.0m / min;

[0035] 3) Soaking: the slab is soaked in a soaking furnace, the temperature of the cast slab is controlled to be 1200-1220℃, and the soaking time is 25 to 35min;

[0036] 4) Descale: High pressure descale on the soaked billet;

[0037] 5) Finishing rolling: the cast billet enters the finishing mill, the cooling water of the roll gap of the F1~F4 stand is controlled to be turned on before the strip head reaches the stand, and the stri...

Embodiment 6

[0054] The measured dimensional tolerances of the B-pillar parts obtained after stamping and forming of the thin gauge hot-formed steel obtained in Example 6 are shown in Table 6;

[0055] Table 1 The chemical composition and weight percentage of hot formed steel in Examples 1 to 6 and Comparative Examples

[0056]

[0057]

[0058] Table 2 Specific process parameters of Examples 1 to 6

[0059] index

[0060] Table 3 Process control and surface quality of Examples 1 to 6 and Comparative Examples

[0061]

[0062]

[0063] It can be seen from Table 3 that compared with the prior art (comparative example), the thin-gauge hot-formed steel obtained in Examples 1 to 6 of the present invention has higher flatness, thickness, and wedge accuracy, and the production process is stable without occurrence Head-lifting, folding, tail-flicking and other accidents, the product surface quality is excellent; the head folding accident occurred in the production process of the comparative example, w...

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Abstract

The invention relates to the technical field of rolled steel and hot forming, in particular to a method of producing thin hot-formed steel based on CSP (chip scale package) process. The thin hot-formed steel designed herein comprises, by weight, 0.20-0.25% of C, 0.15-0.30% of Si, 1.15-1.5% of Mn, 0.20-0.40% of Cr, 0.015-0.05% of Ti, 0.018-0.03% of Nb, 0.002-0.005% of B, 0.015-0.05% of Als, < / =0.015% of P, < / =0.004% of S, < / =0.005% of N, and the balance of Fe and unavoidable impurities. The CSP process used herein comprises the steps of smelting, continuous casting, soaking, descaling, finish rolling, laminar cooling and coiling, flattening, and hot impact forming. The produced thin hot-formed steel has good tensile strength and plasticity, the rolling process has good stability, and the produced thin hot-formed steel has good surface quality and meets the market demand of the automobile industry for 'hot processing instead of cold processing'.

Description

Technical field [0001] The invention relates to the technical field of steel rolling and hot forming, in particular to a method for producing thin gauge hot forming steel based on a CSP process. Background technique [0002] Hot forming technology is a new technology that has emerged in recent years specifically for forming ultra-high-strength steel sheet stamping parts. This technology is characterized by stamping and forming of sheet metal in a red hot state and being cooled and quenched in the mold at the same time. It can be formed Stamping parts with a strength of up to 1500 MPa are widely used in the production of safety parts such as door anti-collision beams, front and rear bumpers, and A-pillars, B-pillars, C-pillars, and middle aisles. [0003] At present, the existing hot formed steel at home and abroad adopts cold-rolled annealed state or pre-coated after cold-rolled annealing, and its production process generally includes pickling + cold rolling, annealing process, its...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/32C22C38/28C22C38/26B21B1/46B21B37/00B21B37/28B21B37/74B21D1/02
Inventor 王成杜秀峰张超王春锋谭佳梅宋波陈宏涛吴维轩刘义滔陈猛
Owner 武汉钢铁有限公司
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