High-strength abrasion-resistant steel for engineering machinery and manufacturing method thereof

A technology of high-strength wear-resistant steel and construction machinery, applied in the field of wear-resistant steel production, can solve the problems of high-strength wear-resistant steel performance requirements and high cost of difficult steels, and achieve the effect of reducing costs

Inactive Publication Date: 2012-08-01
LAIWU IRON & STEEL GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, high-strength wear-resistant steel usually needs to contain one or more of alloying elements such as Mo, Ti, Ni, Cu, etc., resulting in high cost
However, if alloying elements such as Mo, Ti, Ni, and Cu are removed, it is difficult to ensure that the steel meets the performance requirements of high-strength wear-resistant steel

Method used

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  • High-strength abrasion-resistant steel for engineering machinery and manufacturing method thereof

Examples

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preparation example Construction

[0013] The preparation method of high-strength wear-resistant steel for engineering machinery according to the present invention comprises the following steps: smelting target molten steel, the components of which are C: 0.15-0.30%, Si: 0.20-0.65%, Mn: 1.20~1.60%, S≤0.010%, P≤0.020%, B: 0.0010~0.0040%, Cr: 0.30~1.00%, V: 0.030~0.080%, Al: 0.015~0.050%, [N]: 80~200 ×10 -6 、[H]≤2×10 -6 、[O]≤40×10 -6 And the balance of Fe and unavoidable impurities.

[0014] The O element affects the shape and distribution of oxide inclusions in steel. If the oxygen content in steel is too high, oxide inclusions and macro inclusions increase, which seriously affects the cleanliness of steel. Oxide inclusions in steel are one of the sources that affect the toughness of steel, and endanger various properties of steel; especially when the diameter of inclusions is greater than 50 μm, it seriously deteriorates various properties of steel. In order to prevent oxide inclusions with a diameter great...

example 1

[0038] In this example, the production process of high-strength wear-resistant steel is molten iron pretreatment, top-bottom combined blowing converter smelting, LF refining, RH refining, slab continuous casting, controlled rolling and cooling, and heat treatment.

[0039] The specific operation steps are as follows:

[0040] Desulfurization of hot metal is strictly carried out in accordance with the process regulations, the sulfur in the hot metal is controlled at 0.002%, the temperature is 1280°C, and the slag on the surface of the hot metal is removed after desulfurization. The pretreated molten iron enters the converter for smelting, and the slagging materials such as lime are added 3 minutes before the end point, and the basicity of the final slag is controlled at R=4.0~5.0. The final pressure gun time is 65 seconds. Before tapping the converter, first add desulfurizer to the bottom of the ladle, and use Al-Mn-Ti to deoxidize. The amount of Al-Mn-Ti added is 3.5kg / t stee...

example 2

[0048] In this example, the production process of high-strength wear-resistant steel is molten iron pretreatment, top-bottom combined blowing converter smelting, LF refining, RH refining, slab continuous casting, controlled rolling and cooling, and heat treatment.

[0049] The specific operation steps are as follows:

[0050] Desulfurization of hot metal is strictly carried out in accordance with the process regulations. The sulfur in the hot metal is controlled at 0.001%, the temperature is 1221°C, and the slag on the surface of the hot metal is removed after desulfurization. The pretreated molten iron enters the converter for smelting, and the slagging materials such as lime are added 3 minutes before the end point, and the basicity of the final slag is controlled at R=4.0~5.0. The final pressure gun time is 72 seconds. Before tapping the converter, first add desulfurizer to the bottom of the ladle, and use Al-Mn-Ti to deoxidize. The amount of Al-Mn-Ti added is 3.5kg / t stee...

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Abstract

The invention discloses high-strength abrasion-resistant steel for engineering machinery and a manufacturing method thereof. Components of the steel includes, by weight, 0.05-0.30% of C, 0.20-0.65% of Si, 1.20 to 1.60% of Mn, S<=0.010%, P<=0.020%, 0.0010-0.0040% of B, 0.30-1.00% of Cr, 0.030-0.080% of V, 0.015-0.050% of Al, [N]: 80-(200*10-6), [H]<=2*10-6, [O]<=40*10-6, and the balance Fe and inevitable impurities. The steel has surface brinell hardness no less than 395HBW, tensile strength no less than 1220 MPa, elongation after fracture no less than 13% and -20 DEG C shock absorption energy no less than 70J and is low in cost and capable of being used for manufacturing high-strength and high-abrasion resistance mechanical products in the industries of engineering, mining, building, agriculture, cement production, harbors, electric power and metallurgy. For example, the steel can be used as steel balls and lining plates of a ball grinder, bucket teeth of an excavator, rolling mortar walls, toothed plates and hammers of various crushers, track shoes of a tractor and a tank, scraper knives and relieving teeth for a bulldozer and the like.

Description

technical field [0001] The invention relates to the technical field of wear-resistant steel production, and more specifically relates to a low-cost high-strength wear-resistant steel for construction machinery and a preparation method thereof. Background technique [0002] Usually, there is a violent relative movement between mechanical supplies and workpieces during operation, which results in various types of wear, among which abrasive wear is the main form of wear. With the development of industrial modernization, in industrially developed countries, the economic losses caused by the wear and tear of mechanical equipment and its parts account for about 4% of the total output value of the national economy. According to incomplete statistics, due to this kind of wear and natural erosion of mechanical tools, the annual consumption of steel materials in the world is more than 20 million tons. Therefore, solving wear and extending the service life of mechanical equipment and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C38/38C21D8/02
Inventor 李灿明周平赵德文邱春林王建景兰亮云宋红宇黄少文高立福杨建勋崔青玲赵月强章顺虎
Owner LAIWU IRON & STEEL GRP
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