High-temperature resistant and abrasion-resistant white cast iron piece and production method

Abstract

The invention discloses a high-temperature resistant and abrasion-resistant white cast iron piece and a production method to solve the problem in hardness of white cast iron. The high-temperature resistant abrasion-resistant white cast iron piece is characterized in that the white iron casting comprises the following chemical compositions by mass percent: 3.0 to 3.5 percent of C, 30 to 36 percent of Cr, 1.8 to 2.5 percent of Mo, smaller than or equal to 1 percent of Si, 1.0 to 2.0 percent of Ni, 1.05 to 1.5 percent of Mn, 0.5 to 1.0 percent of B, smaller than or equal to 0.10 percent of P, smaller than or equal to 0.08 percent of S, and Fe in balancing amount; and the chromium carbon ratio of the white cast iron is 8.5 to 12. The method comprises the steps of smelting, casting, thermal insulation and cooling. The white cast iron piece has the advantages that casting-state thermal insulation slow cooling hardness HRC is larger than or equal to 61, the hardness HRC after quench tempering is larger than or equal to 66, the hardness HRC can still keep larger than or equal to 61 at 700 DEG C, the corrosion resistance of the white cast iron piece is superior to that of the existing white cast iron piece, and the white cast iron piece is particularly suitable to serve as a wear-resistant part operating under high-temperature condition.

Description

technical field [0001] The invention relates to a metal material and a production method, in particular to a high-temperature-resistant and wear-resistant white cast iron piece with high hardness and a production method. Background technique [0002] White cast iron is a kind of cast iron that does not contain graphite. The carbon in white cast iron exists in the form of cementite, and its cross-section is off-white. It is a good anti-wear material. White cast iron has high hardness and brittleness, cannot withstand cold and hot processing, and can only be used directly for casting. In the industry, the hardness of the general white cast iron material is cast or stress-relieved HRC ≥ 53, hardened or hardened stress-relieved HRC ≥ 58. Although the existing white cast iron materials can achieve higher hardness, they still cannot meet the requirements of some wear-resistant castings in the real industry that require higher hardness and longer life under high temperature condit...

AI Technical Summary

Problems solved by technology

Although the existing white cast iron materials can achieve higher hardness, they still cannot meet the requirements of some wear-resistant castings in the real industry that require higher hardness and longer life under high temperature conditions: such as temperatures greater than 400 ° C, in special High-temperature wear-resistant sleeves of furnace door shafts, fuel injection nozzles, acid-resistant and wear-resistant blades of resin sand high-speed continuous sand mixers, grid plates in crushers, and resin sand recyclers in automatic heating equipment that work in harsh environments Wear-resistant rings, blades of shot blasting machines, guard plates, sheaths, cavity bottom plates in vertical parting molding lines, etc.

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