High-strength toughness corrosion-resistant liner for wet ball mill and preparation method thereof

Abstract

The invention discloses a high-strength and toughness anticorrosive lining plate for a wet ball mill in a mine region and a preparation method. The lining plate comprises the following components: 0.3-0.5% of carbon, 6-8% of chromium, 0.3-0.5% of silicon, 0.4-0.8% of manganese, 0.4-0.5% of molybdenum, 0.2-0.5% of copper, less than or equal to 0.03% of sulfur and phosphorus, 0.03-0.06% of RE and the balance of iron. Heat treatment is performed in the following two ways: (1) heating to 550-650 DEG C at speed of 80-100 DEG C per hour and preserving heat for 3-5h; heating to 1,040-1,060 DEG C at speed of 150-200 DEG C per hour, preserving heat for 4-6h and performing oil quenching; and preserving heat for 6-10h at 260-280 DEG C; and (2) heating to 550-650 DEG C at constant speed of 80-100 DEG C per hour and preserving heat for 3-5h; increasing the heating speed to 150-200 DEG C per hour, heating to 1,060-1,080 DEG C, and performing air quenching; and annealing at 240-260 DEG C. The lining plate has relatively high strength and toughness and corrosion resistance and excellent hardness and wear resistance, the impact resistance of the lining plate of a large wet ball mill is realized, and the service life of the lining plate is greatly prolonged.

Description

technical field [0001] The invention relates to a high-strength toughness corrosion-resistant liner used in a mine wet ball mill and a preparation method thereof, belonging to the technical field of metal materials. Background technique [0002] Due to the harsh industrial and mining conditions of the wet mill liner in metallurgical mines, it is subject to corrosion, impact and wear; in the wet state, especially the wear rate of the same material is several times that of the dry state. In recent years, the liners of various materials currently used in wet mills at home and abroad have unsatisfactory results, mainly due to their short service life. Commonly used lining materials are high manganese steel and ultra-high manganese steel, which have more than toughness, but insufficient hardness, wear resistance and corrosion resistance; low alloy steel has insufficient toughness and corrosion resistance; high chromium cast iron has good wear resistance, but insufficient toughnes...

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Problems solved by technology

[0003] In recent years, some medium-carbon alloy steel liners have appeared. For example, Chinese patent CN102719748A discloses a tungsten-containing heat-resistant alloy steel liner material and its preparation method. However, although the toughness of this invention reaches 65J / cm 2 , but its hardness is very low, only HB259, which is not suitable for large wet mills

Another example is the Chinese patent CN103993234A which discloses a medium-carbon and medium-chromium alloy steel wear-resistant liner and its preparation method. Although the patent does not contain precious metals molybdenum and copper, which reduces the cost to a certain extent, its toughness is insufficient, only 24-46J / cm 2 , it is also not suitable for large wet ball mills with high corrosion

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