Air-cooled reinforced steel for hot-air expansion forming and preparation method of air-cooled reinforced steel

A technology for strengthening steel and air cooling, applied in the field of alloy steel hot forming, can solve the problems of affecting production efficiency, long cooling time, high mold cost, and achieve the effect of fast production cycle, improved casting performance, and simplified production process

Active Publication Date: 2019-06-14
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the current common thermoforming processing technology can only cool down the surface of the mold through the internal cooling water circulation device wh

Method used

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  • Air-cooled reinforced steel for hot-air expansion forming and preparation method of air-cooled reinforced steel
  • Air-cooled reinforced steel for hot-air expansion forming and preparation method of air-cooled reinforced steel
  • Air-cooled reinforced steel for hot-air expansion forming and preparation method of air-cooled reinforced steel

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0027] The invention provides an air-cooled strengthened steel for hot air expansion molding and a preparation method thereof.

[0028] The chemical composition of the strengthened steel is as follows: C: 0.08% to 0.25%, Mn: 1.5% to 2.5%, Si: 0.2% to 0.5%, Cr: 0.5% to 1.5%, Mo: 0.2% to 0.5%, Al : 0.05% to 0.1%, Nb: 0.05 to 0.15%, V: 0.05 to 0.15%, Ti: 0.05 to 0.15%, B: 0.003 to 0.01%, P <0.03%, S <0.03%, the balance is Fe and unavoidable impurities.

[0029] Such as figure 1 with figure 2 As shown, the preparation method of the air-cooled strengthened steel for hot air expansion molding includes the following steps:

[0030] (1) Smelting, casting and forging into slabs;

[0031] (2) Hot rolling: The slab obtained in step (1) is heated, homogenized and then deformed by multiple passes of hot rolling, after rolling, air cooling to coiling temperature, and furnace cooling to room temperature after coiling, to obtain strengthened steel.

Example Embodiment

[0033] Example 1

[0034] The air-cooled strengthened steel for hot air expansion molding made in this embodiment has the following chemical composition mass percentages: C: 0.088%, Mn: 1.85%, Si: 0.25%, Cr: 0.75%, Mo: 0.25%, Al: 0.05% , Nb: 0.05%, V: 0.06%, Ti: 0.05%, B: 0.005%, P <0.03%, S <0.03%, the balance is Fe and unavoidable impurities.

[0035] The preparation method of the air-cooled strengthened steel for hot air expansion molding in this embodiment specifically includes the following steps:

[0036] (1) Forging into slab after smelting and casting: The prepared raw materials are smelted in a vacuum induction melting furnace at a melting temperature of 1660°C and poured into ingots. The ingots are forged and deformed and finally forged into slabs. The cumulative deformation is 80%. After forging, it is air-cooled to room temperature. The heating temperature of the ingot is 1160℃, the holding time is 2h, the opening forging temperature is 1130℃, and the final forging tempe...

Example Embodiment

[0040] Example 2

[0041] The difference from Example 1 is that the coiling temperature of the hot-rolled sheet is 600°C. The mechanical properties of the high-strength structural parts obtained by air-cooling the hot-rolled sheet after high-temperature hot air expansion molding are tested according to the national standard, and its yield strength is 677MPa. The tensile strength is 1023MPa and the elongation is 18.6%, which meets the performance requirements of high-strength steel for a new generation of automobiles.

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Abstract

The invention provides air-cooled reinforced steel for hot-air expansion forming and a preparation method of the air-cooled reinforced steel, and belongs to the technical field of alloy steel hot forming. The reinforced steel comprises the following chemical components of, in percentage by mass, 0.08%-0.25% of C, 1.5%-2.5% of Mn, 0.2%-0.5% of Si, 0.5%-1.5% of Cr, 0.2%-0.5% of Mo, 0.05%-0.1% of Al,0.05%-0.15% of Nb, 0.05%-0.15% of V, 0.05%-0.15% of Ti, 0.003%-0.01% of B, less than 0.03% of P, less than 0.03% of S, and the balance Fe and inevitable impurities. The steel is prepared through rawmaterial preparation, smelting, casting, hot rolling and the like. The preparation method is simple, relatively high in production efficiency and relatively low in cost, and has a wide development andapplication prospect.

Description

technical field [0001] The invention relates to the technical field of alloy steel thermoforming, in particular to an air-cooled strengthening steel for thermal expansion forming and a preparation method thereof. Background technique [0002] With the rapid development of the automobile industry and the continuous improvement of human awareness of environmental protection and energy conservation, metal materials for automobiles are developing towards the two main goals of energy conservation and safety. Energy saving and emission reduction is an urgent problem to be solved in today's automobile industry, and automobile lightweight is one of the important measures to improve the fuel economy of automobiles, save energy consumption and reduce emissions. [0003] Auto parts are the foundation of the development of the automobile industry and an important part of the automobile industry. Because of their high strength, thermoformed parts can simplify the structure and reduce the...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/38C21D8/02
Inventor 米振莉罗翔吴彦欣江海涛
Owner UNIV OF SCI & TECH BEIJING
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