High-boron cast steel for lining plates

Abstract

The invention discloses a high-boron cast steel utilizing low-valent boron as a main alloy element and capable of being used for manufacturing ball mill lining plates. The chemical ingredients of the cast steel and the mass percents thereof are as follows: smaller than 0.4% of C, 0.40-0.8% of Si, 0.5-1.2% of Mn, 0.5-1.2% of Cr, 1.2-3.0% of B, smaller than 0.2% of Re, smaller than 0.1% of V, and smaller than 0.1% of Ti; the cast steel is firstly water cooling quenched for 2h at 950-980 DEG C and is air cooling annealed for 4 h at 200-250 DEG C, the hardness thereof is larger than 58 HRC, the impact toughness is larger than 12 J / cm2, and the depth of a through hardening layer thereof is larger than 40 mm.

Description

technical field [0001] The invention relates to a cast steel, in particular to a cast steel with high boron content, which can be used on the liner of a ball mill and has good wear resistance. Background technique [0002] Material wear is one of the three major forms of material damage, and the economic losses caused are quite staggering. According to statistics, the economic loss caused by wear and tear is about 50 billion US dollars per year in the United States and about 30 billion marks per year in Germany. In my country, nearly 2.3 million tons of balls are consumed by ball mills and nearly 500,000 tons of liners of ball mills and various crushers are consumed due to wear and tear. Wear and tear is common in many industrial sectors such as metallurgy, mining, machinery, electric power, coal, petroleum, transportation, 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 e...

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

The high-chromium white cast iron of nickel-hard cast iron has high hardness and excellent wear resistance, but it contains more alloy elements such as nickel and chromium, and the production cost is high, and its structure contains more carbides, which is brittle. Easy to peel off or even break during use, poor safety