30CrMnSiNi2A high-strength steel for aviation and production method thereof

Abstract

The invention provides 30CrMnSiNi2A high-strength steel for aviation and a production method thereof. The 30CrMnSiNi2A high-strength steel for aviation comprises the following chemical components in percentage by weight: 0.27 to 0.34 percent of C, 0.90 to 1.20 percent of Si, 1.00 to 1.30 percent of Mn, 0.90 to 1.20 percent of Cr, 1.40 to 1.80 percent of Ni, 0.015 to 0.03 percent of Al, 0.02 to 0.03 percent of Mo, 0.02 to 0.03 percent of V, 0.015 to 0.025 percent of Ti, 0.15 to 0.2 percent of W, less than or equal to 0.012 percent of P, less than or equal to 0.01 percent of S and the balance of Fe. According to the 30CrMnSiNi2A high-strength steel for aviation and the production method provided by the invention, a smelting process comprising electric furnace die casting, external refining and electroslag remelting which is always adopted abroad is completely replaced by the method comprising electric furnace continuous casting, external refining and electroslag remelting, so that the effect of improving the material structure property and the fatigue property is obvious. By means of the method, batch, systematic and energy-saving production can be carried out, and energy and cost are obviously saved.

Description

technical field [0001] The invention belongs to the technical field of metal materials; in particular, it relates to a 30CrMnSiNi2A high-strength steel for aviation and a production method thereof. Background technique [0002] With the rapid development of my country's aerospace industry technology, the impact resistance, fatigue strength, toughness and plasticity of the steel used for aircraft landing gear are strictly required in the aerospace field. At present, the landing gear of international and domestic passenger aircraft and some military aircraft are made of high-strength steel variety 30CrMnSiNi2A. With the rapid development of my country's aviation industry and national defense industry, the demand for high-strength steel 30CrMnSiNi2A will increase significantly. Batch and stable production put forward higher requirements for the production technology of the steel. [0003] For the 30CrMnSiNi2A steel used for landing gear, due to the characteristics of the steel...

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Problems solved by technology

[0003] For the 30CrMnSiNi2A steel used for landing gear, due to the characteristics of the steel and the defects of transverse cracks and longitudinal cracks in the production process, the smelting process of electric furnace die casting + external refining + electroslag remelting has been used abroad; Batch, systematic, and energy-saving production will waste a lot of energy and cost. Therefore, the production of high-strength steel 30CrMnSiNi2A by the smelting process of electric furnace continuous casting + external refining + electroslag remelting has become the key to the technical breakthrough of this material links and development trends

[0004] In order to solve the problems that transverse cracks and longitudinal cracks are prone to occur in the production process of existing materials, as well as the inability to carry out batch, systematic and energy-saving production, and the waste of energy and costs, it is necessary to design, develop, develop and produce a 30CrMnSiNi2A high-strength steel continuous casting electrode billet electroslag remelting steel and its production method for aviation use have achieved stable product performance, good fatigue performance, and physical quality reaching the international advanced level. Significantly enhance the competitiveness of the product in the domestic market

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