High-strength and low-cost dilute alloy wear resistant cast steel

Abstract

The invention discloses a low-cost and high-strength wear resistant cast steel utilizing silicon and manganese as main alloy elements and capable of being used for manufacturing such wear resistant components as a ball mill lining plate and an excavator bucket tooth, and the like. The chemical ingredients of the cast steel and the mass percents thereof are as follows: 0.2-0.6% of C, 0.5-1.5% of Si, 0.5-1.5% of Mn, 0.5-1.5% of Cr, smaller than 0.20% of Ti, smaller than 0.20% of RE, smaller than 0.015% of B, smaller than 0.15% of Ca and smaller than 0.015% of Al; the cast steel is firstly quenched at 950+ / -10 DEG C and is annealed at 200+ / -10 DEG C, the tensile strength thereof is larger than 1550 MPa, the impact toughness is larger than 90 J / cm2, the fracture toughness is larger than 80 Mpa.m1 / 2, and the hardness thereof is larger than 52 HRC.

Description

technical field [0001] The invention relates to a low-alloy wear-resistant cast steel, especially one that does not contain precious metal elements such as molybdenum, nickel, copper, vanadium, etc., and uses silicon, manganese, and chromium as main alloy elements, and can be used to manufacture excavator bucket teeth and crusher hammers. High-strength wear-resistant cast steel for wear-resistant parts such as head and ball mill liner. Background technique [0002] Material wear is one of the three major forms of material damage alongside material fracture and material corrosion, and the resulting economic losses are quite staggering. According to statistics, my country's annual consumption of ball mills due to wear and tear is nearly 2.3 million tons, ball mills and various crusher liners consume nearly 500,000 tons, and rolls consume nearly 900,000 tons. A variety of wear-resistant conveying pipes, various crusher hammer heads and jaw plates, and various track shoes consu...

AI Technical Summary

Problems solved by technology

Low and medium alloy wear-resistant steels have better strength and toughness, and the wear resistance under low and medium impact loads is better than that of high manganese steels, but they have the disadvantages of low hardenability and hardenability, and poor wear resistance

High-chromium cast iron contains more than 20% of high-hardness eutectic carbides, which has excellent wear resistance, but has the disadvantages of high content of alloying elements, high production costs, and easy deformation and cracking during high-temperature heat treatment. Ordinary white cast iron and Low-alloy white cast iron carbides have low hardness, and the carbides are distributed in a continuous manner, with high brittleness and easy peeling or even cracking during use

[0004] In addition, most of the wear-resistant alloy steels developed at home and abroad contain expensive alloying elements such as nickel and molybdenum, resulting in high cost of wear-resistant cast steel and weakened competitiveness