Roll ring steel for aluminium casting rolling mill and heat treatment method thereof

Abstract

The invention relates to a roll sleeve steel for aluminum casting and rolling mills and a heat treatment method thereof. A roll sleeve steel for aluminum casting and rolling mills, the chemical composition weight percent (%) is: carbon (C) 0.30-0.45, manganese (Mn) 0.60-0.80, silicon (Si) 0.20-0.40, phosphorus (P) ≤ 0.025 , sulfur (S) ≤ 0.025, chromium (Cr) 2.00 ~ 3.00, nickel (Ni) 0.50 ~ 1.00, molybdenum (Mo) 0.80 ~ 1.20, vanadium (V) 0.10 ~ 0.20, aluminum (Al) ≤ 0.012, the rest is iron and other impurities. The final heat treatment method of the roller sleeve steel is secondary tempering after quenching, the quenching heating temperature is 850-920°C, and quenching in engine oil after heat preservation; the first tempering roller sleeve is heated to 500-560°C, and the heat preservation is 10-20 hours. Cool in oil; the second tempering parameters are the same as the first tempering parameters. The invention improves the ability of the roller sleeve to resist thermal fatigue cracks, thereby increasing the service life of the roller sleeve, reducing production failures and reducing production costs.

Description

(1) Technical field [0001] The invention relates to a roll sleeve steel for aluminum casting and rolling mills and a heat treatment method thereof. (2) Background technology [0002] In the 1980s, my country began to adopt casting and rolling technology and equipment in aluminum processing and production. From the late 1990s to the first three years of the 21st century, the production of cast-rolling aluminum coils in my country experienced a rapid development. New casting and rolling machines are continuously put into production, but the technical level of casting rolls, a key component in casting and rolling machines, lags behind developed countries by about 20 years. The roll sleeve is an alloy steel cylinder on the casting roll, which is shrunk on the roll core to form the casting roll. See figure 1 . The roll sleeve is also the working part of the casting roll. When the molten aluminum flows on the roll sleeve, it solidifies into solid aluminum and is rolled into a st...

AI Technical Summary

Problems solved by technology

The performance of the existing roller sleeves is unstable, and sometimes bursts occur during the working process, and sometimes abnormal fatigue cracks appear, resulting in the scrapping of the roller sleeves and causing huge economic losses

The reason is that the production process of the roller sleeve is unreasonable due to the poor crack resistance of the roller sleeve material

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