High-copper low-nickel molybdenum alloy material

Abstract

The invention relates to a high-copper low-nickel molybdenum alloy material, which is prepared by utilizing an intermediate-frequency electric furnace and comprises the following chemical components by weight percent (%): 2.8-3.0% of C, 1.8-2.2% of Si, 0.4-0.6% of Mn, less than 0.1% of P, less than 0.1% of S, 2.0-2.2% of Cu, 0.7% of Mo, 0.2% of Ni, and the balance of Fe. The high-copper low-nickel molybdenum alloy material is prepared according to the following steps of: quickly increasing the temperature of molten iron in the electric furnace to 1,570-1,600 DEG C; starting conventional breeding; after ending breeding, ensuring the temperature in a casting crucible within a scope of 1,440-1,460 DEG C and casting; after cooling the temperature of a casting mould to be 1,150 DEG C, performing water cooling; and not stopping cooling till the temperature of a casting blank is at 700 DEG C. The hardness of the material is 270-310HB and the strength reaches 280Mpa.

Description

Technical field [0001] The invention relates to a high-strength metal material, which is especially suitable for a high-strength cylinder liner. Background technique [0002] As the whole society attaches great importance to environmental protection, the engine is developing towards high power and small volume, and the requirements for the cylinder liner, an important part of the automobile engine, are getting higher and higher. The metallographic and physical and chemical indicators of ordinary low-alloy cylinder liners cannot meet the use requirements. The metallographic structure and mechanical properties of the cylinder liner with bainite structure can meet the requirements of high strength, but in order to obtain the bainite structure in the casting process, precious alloy elements such as Ni and Mo need to be added in the smelting process, raw materials The cost is huge. Contents of the invention [0003] In order to improve the mechanical performance of the automob...

AI Technical Summary

Problems solved by technology

[0002] As the whole society attaches great importance to environmental protection, engines are developing towards high power and small volume, and the requirements for cylinder liners, an important part of automobile engines, are getting higher and higher. The metallographic and physical and chemical indicators of ordinary low-alloy cylinder liners cannot meet the requirements for use. The metallographic structure and mechanical properties of the cylinder liner with bainite structure can meet the requirements of high strength, but in order to obtain the bainite structure in the casting process, it is necessary to add precious alloy elements such as Ni and Mo in the smelting process, raw materials cost a lot