High-hardenability medium-carbon MnCrMoB steel for transmission parts of engineering machinery and manufacturing method of high-hardenability medium-carbon MnCrMoB steel

Abstract

The invention relates to high-hardenability medium-carbon MnCrMoB steel for transmission parts of engineering machinery. The high-hardenability medium-carbon MnCrMoB steel for the transmission parts of engineering machinery is prepared from the following chemical components in percentage by weight: 0.30 to 0.38 percent of C, 0.10 to 0.35 percent of Si, 1.25 to 1.50 percent of Mn, 0.40 to 0.65 percent of Cr, 0.020 to 0.050 percent of Ti, 0.0015 to 0.0040 percent of B, 0.08 to 0.15 percent of Mo, less than or equal to 0.020 percent of S, less than or equal to 0.025 percent of P, less than or equal to 0.20 percent of Cu, less than or equal to 0.04 percent of Al, less than or equal to 0.0020 percent of O and the balance of Fe and inevitable impurities. According to the high-hardenability medium-carbon MnCrMoB steel for the transmission parts of engineering machinery, by adding a proper amount of B, the content of Cr and Mo of alloy is greatly reduced or the content of Ni is eliminated, the production cost is reduced, and meanwhile, the important performance index hardenability of the steel can meet the requirement for large torsion of the steel for an engineering mechanical transmission system.

Description

technical field [0001] The invention relates to a high-hardenability medium-carbon MnCrMoB steel for engineering machinery transmission parts and a manufacturing method thereof. It belongs to the technical field of iron and steel metallurgy. Background technique [0002] Construction machinery mainly includes spare parts such as excavation machinery, shovel transport machinery, engineering hoisting machinery, forklifts and industrial vehicles. The materials for welded structural parts required for the manufacture of these machines are generally called engineering machinery steels. There are many types of steel for construction machinery. In addition to various grades of plates, there are many steel types with different components for manufacturing rail joints, chain plates, transmission components, pins, etc. according to different requirements. The transmission mechanism bears a large torsion force, and has high requirements on the performance of the steel grade, and the ...

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Problems solved by technology

But it is not suitable for making steel for transmission parts of construction machinery