A wear -resistant alloy steel lining board and its preparation method

Abstract

The invention relates to the technical field of alloy steel production, in particular to a wear-resisting alloy steel liner plate which comprises the following chemical elements in percentage by weight: 0.3%-0.5% of C, 0.6%-0.8% of P, 0.5%-0.7% of Mn, 1.8%-2.0% of Cr, 0.03%-0.05% of S, 0.1%-0.2% of Mo, 0.8%-1.2% of V, 0.07%-0.1% of W and the balance Fe. Contents of Mn and Mo are lower, so that thecost is reduced; the wear-resisting alloy steel liner plate is subjected to thermal treatment at 950 DEG C, the production control difficulty is lowered and the cost is low; and the wear-resisting alloy steel liner plate provided by the invention is high in strength and impact toughness and low in production control difficulty and cost and facilitates large-scale application and popularization.

Description

technical field [0001] The invention relates to the technical field of alloy steel production, in particular to a wear-resistant alloy steel liner and a preparation method thereof. Background technique [0002] Ball mills are widely used to grind materials in metallurgical mines, cement building materials, electric power, chemical fertilizers, coal, and chemical industries. The liner is the main consumable part of the ball mill, and its quality affects the production rate of the mill. [0003] It also affects the cost of material grinding. [0004] After more than 30 years of development, the production and application of lining materials at home and abroad have experienced from high manganese steel, ordinary white cast iron, nickel hard cast iron, high chromium white cast iron to modified high manganese steel and various quenching and tempering. Stages of development of process for low and medium alloy steels. [0005] Among the several mainstream materials at present, on...

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Problems solved by technology

[0005] Among the several mainstream materials at present, one is austenitic high manganese steel, which has high toughness and low original hardness. During use, it mainly relies on austenite work hardening to increase its hardness. However, when used under medium and small impact loads, the austenite cannot be fully work-hardened, and its wear resistance is poor; the second is medium and low alloy steel, such as the Chinese invention patent CN1080327 which discloses a low alloy ball mill Wear-resistant lining board and manufacturing process, the content of each material component is: C 0.35-0.5%, Cr 0.8-1.5%, Si 0.6-1.2%, Mo 0.3-0.5%, Mn0.6-1.4%, Cu 0.5-1 %, 1#Re 0.01-0.1%, the balance is Fe

But this invention contains expensive molybdenum and copper, so the production cost is relatively high. In addition, only rare earth is added, and the purification and refinement effect is not very good. Therefore, the toughness of the liner material of this invention is low, and the impact toughness is greater than 18J / cm 2 ; The third is high chromium cast iron, which has good wear resistance but poor toughness

Therefore, the comprehensive impact, corrosion and wear properties of these materials are not good.