Low-cost decarbonization-preventing coating material for heavy rail steel and application of coating material

Abstract

The invention discloses a low-cost decarbonization-preventing coating material for heavy rail steel and an application of the coating material. The low-cost decarbonization-preventing coating material is prepared from the following raw materials based on weight percentage: 43-52% of river sand, 8-15% of Al<2>O<3> powder, 10-15% of B<2>O<3> powder, 2-5% of light-burned dolomite, 12-17% of iron oxide red powder, 1-2% of Na<2>O powder, and 8-11% of LF refining slag. By adoption of the decarbonization-preventing coating material, occurrence of a surface decarbonization phenomenon of a heavy rail steel casting blank in a heating process can be effectively avoided for a long time, and the decarbonization layer depth on the surface of the casting blank can be lowered; after the decarbonization-preventing coating material is adopted, the surface decarbonization layer depth of the casting blank is less than or equal to 0.4mm when the heavy rail steel casting blank is heated in a heating furnace with furnace gas oxygen content of greater than or equal to 3% for 10-12h, so that related requirement of TB/T 2344-12 is satisfied; meanwhile, compared with a conventional decarbonization-preventing coating material, the manufacturing cost of the low-cost decarbonization-preventing coating material disclosed by the invention is effectively lowered; and therefore, the low-cost production of a heavy rail steel product is realized, and the production cost of each ton of steel is lowered by about 20RM averagely.

Description

technical field [0001] The invention relates to a metal coating material, in particular to a low-cost anti-decarburization coating material for heavy rail steel. Background technique [0002] C is the main element other than Fe in heavy rail steel, and it is also the main strengthening element, which can enhance the strength, hardness and wear resistance of heavy rail. With the increase of carbon content, the strength limit, hardness and wear resistance of heavy rail steel increase rapidly. According to statistics, when the carbon content increases from 0.35% to 0.65%, the wear resistance of steel can be increased by 60%. [0003] The carbon content of heavy rail steel is usually 0.71% to 0.80%. Due to the high carbon content, the slab is highly sensitive to overheating and overburning in the heating furnace, and serious decarburization is prone to occur. The so-called decarburization phenomenon refers to the phenomenon that the carbon content of the surface metal is redu...

AI Technical Summary

Problems solved by technology

At present, there are still some problems in the composition of many kinds of anti-decarburization coatings: 1. The formulas all contain high content of oxides of precious metals such as Zr, Y, Ti, K, etc. Although these oxides can effectively adjust the coating 2. Although the C element added in the formula can also adjust the melting point of the coating, the CO and CO produced by the C element burning at high temperature 2 It will overflow from the formed coating melt film, which will reduce the compactness of the coating and even lead to the failure of the coating effect

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