High-temperature oxidation-resistant steel for non-coating hot stamping

A technology of hot stamping and high temperature oxidation resistance, which is applied in the field of iron and steel materials, can solve the problems of increasing production processes and increasing production costs, and achieve the effects of saving protective atmosphere costs, improving hardenability, and improving oxidation resistance

Active Publication Date: 2014-03-05
HENAN SUDA ELECTRIC AUTOMOBILE TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

But at the same time, it also increases the production process and increases the production cost.

Method used

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  • High-temperature oxidation-resistant steel for non-coating hot stamping
  • High-temperature oxidation-resistant steel for non-coating hot stamping
  • High-temperature oxidation-resistant steel for non-coating hot stamping

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Embodiment Construction

[0023] Embodiments, the technical solutions of the present invention are described below with specific examples, but the present invention is not limited thereto.

[0024] Table 1 shows the chemical composition of a high-temperature oxidation-resistant non-coated hot stamping steel of the present invention; it is vacuum smelted, cast into billets, and rolled to a thickness of 1.8mm after hot rolling and cold rolling.

[0025] Table 1 Chemical composition of non-coated hot stamping steels resistant to high temperature oxidation (mass percentage, %)

[0026]

[0027] Cut the cold-rolled and annealed sheet of Example 1 into square sheets of 400×400mm, heat them in a heating furnace to 930°C, and hold the heat for 3 minutes to ensure that they are fully austenitized; Stamping in a flat mold with a cooling system; after stamping and forming, pressurization and quenching are required, the cooling rate is controlled at 40-60°C / s, and the mold temperature is controlled at 1...

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Abstract

The invention discloses high-temperature oxidation-resistant steel for non-coating hot stamping. The high-temperature oxidation-resistant steel comprises the following chemical components in percentage by weight: 0.18-0.28% of C, 0.05-0.50% of Si, 0.20-0.90% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.20-1.50% of Cr, 0.01-0.30% of Mo, 0.0006-0.0030% of B, 0.02-0.25% of Nb+V+Ti, 0.010-0.100% of Al and the balance of iron and inevitable other impurity elements. The preparation method of the high-temperature oxidation-resistant steel comprises a hot stamping process after processes of steel making, blank casting, hot rolling, acid cleaning and cold rolling to ensure that the steel can be prepared, wherein a metallographic structure is a full martensite. The steel for hot stamping, disclosed by the invention, has the characteristics of fine grain, oxidation resistance, low critical cooling rate and the like and can be normally used under the condition without a protective atmosphere, and the performance of the steel meets requirements for oxidation resistance of a hot stamping plate and strength of a hot stamping component.

Description

technical field [0001] The invention belongs to the field of iron and steel materials, and more specifically, the invention relates to a steel plate for hot stamping and related processes. Background technique [0002] In recent years, with the deterioration of the environment and the increasing shortage of energy, the consideration of environmental protection, safety and energy conservation has become the main development direction of the automobile manufacturing industry, and among many measures such as reducing fuel consumption and reducing exhaust emissions, reducing vehicle weight is the most effective obvious. In order to ensure safety and at the same time reduce the weight of automobiles to reduce fuel consumption and emissions, the development of high-strength steel for automobiles has become an inevitable trend. However, high-strength steel is difficult to cold form and springback cannot be avoided. Therefore, hot stamping technology has emerged. Stamping can effec...

Claims

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Application Information

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IPC IPC(8): C22C38/32C21D8/00
Inventor 马鸣图易红亮宋磊峰王国栋王中学郭怡晖方刚张均萍
Owner HENAN SUDA ELECTRIC AUTOMOBILE TECH
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