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Excavator silicon-manganese alloy steel bucket tooth cast and processing process thereof

An alloy steel and excavator technology is applied in the field of excavator silicon-manganese alloy steel bucket tooth castings and its processing technology, which can solve problems such as poor fracture resistance and low service life, and achieve improved hardness and impact resistance. Abrasion resistance and service life, improved morphology and distribution

Active Publication Date: 2013-04-03
滁州恒昌机械装备制造有限公司
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Problems solved by technology

The most commonly used bucket tooth material in China is high manganese steel, which has the problems of low service life and poor fracture resistance

Method used

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Embodiment Construction

[0020] An excavator silicon-manganese alloy steel bucket tooth casting, the weight percentage of each chemical component is: C 0.28-0.32%, Si 0.8-1.2%, Mn 1.4-1.8%, Cr 0.9-1.3%, Cu 0.4-0.6 %, Ca 0.03-0.05%, Mg 0.06-0.08%, B 0.0015-0.003%, Ti 0.08-0.14%, Nb 0.02-0.04%, Y 0.02-0.03%, Nd 0.015-0.025%, P≤0.03%, S ≤0.03%, the balance is iron and impurities.

[0021] The processing technology of silicon-manganese alloy steel bucket tooth castings for excavators includes the following steps:

[0022] (1) Melting and casting

[0023] According to the above ratio, the steelmaking raw materials are put into the medium frequency induction furnace for smelting, the furnace temperature is 1640-1650°C, and then vacuum full mold casting and resin sand mold casting are adopted, the pouring temperature is 1580-1620°C, and the heat preservation is 30-30°C after pouring. After 40 minutes, the casting was slowly cooled to room temperature for demoulding;

[0024] (2) Annealing ...

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Abstract

The invention discloses an excavator silicon-manganese alloy steel bucket tooth cast which comprises the following chemical components in percentage by weight: 0.28-0.32% of C, 0.8-1.2% of Si, 1.4-1.8% of Mn, 0.9-1.3% of Cr, 0.4-0.6% of Cu, 0.03-0.05% of Ca, 0.06-0.08% of Mg, 0.0015-0.003% of B, 0.08-0.14% of Ti, 0.02-0.04% of Nb, 0.02-0.03% of Y, 0.015-0.025% of Nd, P less than or equal to 0.03%, S less than or equal to 0.03% and the balance of iron and impurities. The excavator silicon-manganese alloy steel bucket tooth cast disclosed by the invention has the advantages of being added with Ca, Mg and rare earth elements, namely Y and Nd, purifying the molten steel, thinning the crystal grains, improving the form and distribution of impurities and realizing the comprehensive strengthening of an alloy steel, thereby enhancing the abrasion resistance of bucket teeth and prolonging the service life of the bucket teeth. According to the invention, a reasonable heat treatment process, appropriate annealing treatment, quenching and tempering are adopted, therefore the rigidity property and impact resistant property of the alloy steel can be outstandingly enhanced.

Description

technical field [0001] The invention relates to an excavator silicon-manganese alloy steel bucket tooth casting and a processing technology thereof, belonging to the technical field of alloy steel manufacturing technology. Background technique [0002] Excavator bucket teeth are wearing parts that are consumed in large quantities in mining operations. The working conditions are harsh, and most of the failure modes are wear and tear, and a few of them are broken. The bucket teeth are generally installed at the front end of the excavator bucket, which is a cantilever beam member, directly in contact with ore, sand, rock and other materials. When contacting the material, it not only bears the impact action, but also bears the bending moment action. During the service process, the tip of the bucket tooth is subject to large impact and sliding abrasive wear, and various furrows and deformations often appear on the surface of the tip, resulting in surface wear or shedding. The m...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/32C21D1/18C21D1/26C21D8/00C21D7/06C21D9/00
Inventor 吕忠发
Owner 滁州恒昌机械装备制造有限公司
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