Boron-containing multi-element low alloy wear resistant cast steel and preparing method thereof

Abstract

The invention discloses boron-containing multi-element low alloy wear resistant cast steel, and the chemical components (according to weight percentage) are as follows: 0.20 percent to 0.45 percent of C; 1.1 percent to 1.8 percent of Mn; 0.8 percent to 1.5 percent of Si; 0.3 percent to 1.2 percent of Cr; 0.05 percent to 0.20 percent of B; 0.08 percent to 0.30 percent of Ti; 0.03 percent to 0.20 percent of N; 0.05 percent to 0.15 percent of Ca; and 0.04 percent to 0.15 percent of K; and the balance is Fe and inevitable trace impurity. The preparing method adopts scrap steel, ferrosilicon, ferrochromium and ferromanganese as raw material, uses waste graphite electrode or pig iron to increase carbon, after the steel is melted and the ingredients of bath adjustment are qualified, the molten steel is heated to 1620 to 1660 DEG C, then calcium silicon alloy, ferroboron, ferrotitanium and nitrogen-containing ferrochrome are added before tapping, the material is moved out of the furnace, then yttrium-based rare earth magnesium alloy and potassium-containing substance are crushed into small pieces with the particle size of less than 15mm; after being dried at the temperature of 130 to 180 DEG C, the small pieces are positioned at the bottom of a pouring ladle, compound modification treatment is executed to the molten steel by adopting a ladle crushing method, the pouring temperature of the molten steel is 1480 to 1520 DEG C, casting parts are austenized under the condition of 830 DEG C to 1050 DEG C multiplied by (0.5 to 4)h and cooled fast, and then furnace cooling or air cooling is executed at the temperature of 150 DEG C to 300 DEG C after heat-preserving for 2 to 6 hours, therefore, the boron-containing multi-element low alloy wear resistant cast steel can be obtained.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant metal materials, and relates to a wear-resistant cast steel and a preparation method thereof, in particular to a boron-containing multi-element low-alloy wear-resistant cast steel containing no precious alloy elements such as molybdenum and nickel and a preparation method thereof. Background technique [0002] Wear and tear is common in many industrial sectors such as metallurgy, mining, machinery, electric power, coal, petroleum, transportation, aviation and military industry, and has become an important cause of equipment failure or material damage, and is also one of the problems that cause the most economic losses. Research and It is of great significance to the national economy to develop a new generation of wear-resistant materials and reduce metal wear. At present, the widely used wear-resistant materials mainly include alloy steel and white cast iron. The former has good toughness, ...

AI Technical Summary

Problems solved by technology

After heat treatment, this alloy cast steel has a microstructure of martensite plus bainite and a small amount of retained austenite. It has good strength, toughness and wear resistance, and its service life is more than double that of high manganese steel. But containing expensive molybdenum will increase the production cost