Continuous-casting martensitic spheroidal graphite cast iron lining plate and machining process thereof

Abstract

The invention discloses a continuous-casting martensitic spheroidal graphite cast iron lining plate and a machining process thereof. The lining plate comprises the following raw materials in percentage by weight: 3.40 to 3.90 percent of C, 2.20 to 2.50 percent of Si, 0.80 to 1.20 percent of Mn, 0 to 0.50 percent of Cr, 0 to 0.03 percent of S, 0 to 0.10 percent of P, 0.03 to 0.06 percent of Re, 0.03 to 0.05 percent of Mg and the balance of Fe. The lining plate is machined by the machining process comprising electric furnace smelting, spherifying, crystallization, continuous casting, thermal treatment and the like. The continuous-casting martensitic spheroidal graphite cast iron lining plate machined by the machining process according to the formula has the characteristics of fine crystal grains, strong strength, corrosion resistance, wear resistance and low noise in use, and improves the working environment of a workshop.

Description

technical field [0001] The invention relates to a steel fitting and a processing method thereof, in particular to a nodular cast iron liner and a processing technology thereof. Background technique [0002] At present, in the domestic ferrous metal mining industry, tubular ball mills, namely wet mills, are usually used for grinding. The lining plates used are made of EGMn13 and alloy steel. The casting process of the lining plates is full sand casting, but the obtained lining plates The average service life of the steel is 4 to 6 months and the grinding effect is very unsatisfactory. The specific performance is: the grain size is coarse, the cooling speed of the molten steel in the sand mold is very slow, and it is close to the heat preservation state, so that the grain size of the lining plate is large and reduces The mechanical properties of the liner are improved, thereby increasing the grinding consumption; the hardness is low, the initial hardness (HB) of EGMn13 is not ...

AI Technical Summary

Problems solved by technology

[0002] At present, in the domestic ferrous metal mining industry, tubular ball mills, that is, wet mills, are usually used for grinding. The lining plates used are made of EGMn13 and alloy steel. The casting process of the lining plates is full sand casting, but the obtained lining plates The average service life of the steel is 4-6 months and the grinding effect is very unsatisfactory. The specific manifestations are: the grain size is coarse, the cooling speed of the molten steel in the sand mold is very slow, and it is close to the heat preservation state, so that the grain size of the lining plate is large and reduces The mechanical properties of the liner are improved, thereby increasing the grinding consumption; the hardness is low, the initial hardness (HB) of EGMn13 is not higher than 240, the liner is hardened during work to resist wear, when the working conditions cannot bring it When the impact force is large, it cannot play the role of work hardening, thereby greatly increasing wear; although alloy steel can reach a higher hardness (HRC higher than 50) through quenching, but due to congenital defects, coarse grains and low tensile strength Not high, in the process of use, it is easy to cause fracture and premature failure

In addition, when the above-mentioned liners are installed and used, the noise generated by the workshop is relatively large, which pollutes the environment.

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