High wear resistant ultra-high carbon steel and preparation method for same

Abstract

The invention relates to high wear resistant ultra-high carbon steel, which mainly contains alloy element chromium and comprises the chemical components: (according to weight percentage): 1.25-1.35% of C (carbon), 3.2-4.2% of Cr (chromium), 0.5-1.2% of Si+Al (silicon and aluminum), 0.85-1.25% of Mn (manganese), 0.08-0.15% of V (vanadium), 0.3% of Mo (molybdenum) or less than 0.3% of Mo, 0.025% of S (sulphur) or less than 0.025% of S, 0.025% of P (phosphorus) or less than 0.025% of P and the rest of Fe (ferrum) and inevitable impurities. The preparation method for the high wear resistant ultra-high carbon steel includes that after being refined, the components are heated at the temperature of 900-920 DEG C and are in salt bath at the constant temperature of 300-320 DEG C for 30min, and then the components are placed into a 320-340 DEG C box-type resistance furnace and insulated for 120-240min prior to air cooling. The high wear resistant ultra-high carbon steel can be produced by the aid of a medium frequency induction furnace, a vacuum induction furnace and an arc furnace with LF (low frequency) refining process. Compared with high manganese steel and high-chromium iron wear-resistant materials, the high wear resistant ultra-high carbon steel is remarkably lower in production cost. The high wear resistant ultra-high carbon steel with high hardness (55-57HRC (Rockwell hardness)) and fine impact flexibility (higher than or equal to 40J / cm2) can be used for manufacturing wear resistant parts such as hammerheads of crushers, liners for ball mills and the like requiring high wear resistance.

Description

Technical field: [0001] The invention relates to a low-cost ultra-high-carbon wear-resistant steel mainly containing alloy element chromium, in particular to steel for wear-resistant parts such as crusher hammers and ball mill liners. technical background: [0002] With the rapid development of iron and steel industry, electric power and construction industry, the amount of crushing and grinding of raw materials such as ore, raw coal and stone has increased sharply, and wear-resistant materials are important and expensive parts in crushing and grinding machinery. The quality and performance of the crusher and its reasonable selection directly affect the work efficiency and production cost of crushing and grinding. Therefore, the research on the failure mode and mechanism of wear-resistant parts under different service conditions has been paid attention to. The research results show that the characteristics and mechanisms of abrasive wear are diverse. This diversity is not on...

AI Technical Summary

Problems solved by technology

For the hammer head of the hammer crusher, the hammer head is subjected to impact wear and erosion and grinding when crushing materials. In many cases, especially for hammer heads below 12Kg, the impact load is not significant, resulting in the processing of high manganese steel and high manganese steel. Hardening characteristics are difficult to fully exert, causing problems of rapid wear and short life

In order to overcome the above problems of high manganese steel and have a significantly lower cost than high chromium cast iron, low and medium alloy wear-resistant steels have been developed in recent years. The carbon content is mostly below 0.8%, and the hardness is generally lower than 55HRC, and the hardness is improved. After that, the impact toughness decreases