Improved agricultural machinery cutting tool steel and production method thereof

Abstract

The invention discloses improved agricultural machinery cutting tool steel. The steel is prepared from the following chemical elements of, in percentage by mass, 0.33%-0.35% of C, 0.30%-0.40% of Si, 1.30%-1.40% of Mn, 0.50%-0.60% of Cr, 0.002%-0.004% of B, 0.050%-0.065% of Ti, 0.070%-0.090% of Al, less than or equal to 0.015% of P, less than or equal to 0.005% of S, and the balance Fe. A smeltingraw material is prepared according to the chemical components, the smelting raw material is sequentially subjected to KR desulfurization, converter smelting, LF refining, RH vacuum degassing, soft blowing, continuous casting and continuous rolling, and finish-rolled flat steel with the thickness being 10 mm and the width being 78 mm is obtained. Compared with agricultural machinery cutting tool steel supplied in the market at present, the agricultural machinery cutting tool steel has higher purity, higher corrosion resistance, higher strength and higher wear resistance; and the non-metallic inclusions A, B, D and Ds type are smaller than or equal to 1.0 grade, the non-metallic inclusions C type are 0 grade, the tensile strength Rm is larger than or equal to 1150 Mpa, the yield strength Relis larger than or equal to 950 Mpa, the percentage elongation after fracture is larger than or equal to 15%, the percentage reduction of area is larger than or equal to 55%, the wear resistance is improved by more than 50%, and corrosion and rusting are not easily caused during operation in a weak-acid or weak-alkaline environment.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, relates to tool steel in the iron and steel industry, in particular to an improved steel for agricultural machinery cutting tools and a production method thereof. Background technique [0002] Agriculture is the foundation of the national economy, and it solves the basic material requirements of people's lives. The development of agriculture is related to national prosperity and stability. The development of modern agriculture is inseparable from advanced agricultural machinery and equipment, and the quality of agricultural machinery and equipment determines the level of agricultural modernization. The most commonly used large-scale agricultural machinery is exactly harvester at present, except power equipment, the most important thing of harvester is its cutting tool. Agricultural machinery cutting tools are tools for agricultural machinery operations, and the quality of the cutting tools ...

AI Technical Summary

Problems solved by technology

As a wearing part of agricultural machinery, cutting tools often need to be replaced or repaired after a period of use. Therefore, more and more agricultural machinery manufacturers require cutting tools to have a longer service life, that is, to require agricultural machinery cutting tools to be more corrosion-resistant, more wear-resistant, and durable. Higher strength, while the traditional 30MnB5 material can no longer meet this requirement, thus limiting its use

Images