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Low-cost high-tenacity super wear-resistant steel and manufacturing method thereof

A high-toughness, low-cost technology, applied in the field of low-alloy wear-resistant materials, can solve the problems of low elongation and impact toughness of wear-resistant steel, insignificant surface hardening effect, and high Ni content, so as to improve hardenability, Improves wear resistance and reduces production costs

Inactive Publication Date: 2015-11-04
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN 103255341 A "A high-strength and high-toughness hot-rolled wear-resistant steel and its manufacturing method" The elongation and impact toughness of the wear-resistant steel prepared by A are low, and the TRIP effect is used in the manufacture to enhance the hardness and wear resistance of the wear-resistant steel However, only under high impact conditions, the TRIP effect is better. Under medium and low impact conditions, it is similar to high manganese steel, and its surface hardening effect is not obvious.
Moreover, the content of Ni element added therein is high, the production cost is high, and the economic benefit is not obvious

Method used

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  • Low-cost high-tenacity super wear-resistant steel and manufacturing method thereof
  • Low-cost high-tenacity super wear-resistant steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The smelting of wear-resistant steel in this embodiment uses pure iron, scrap steel and ferroalloy, and is smelted in a vacuum heating furnace. After casting and forming, after high-pressure dephosphorization, the above process is carried out for hot rolling, and then heat treatment.

[0038] The low-alloy wear-resistant steel of this embodiment contains the following chemical elements: carbon 0.41%, Si: 1.60%, Mn: 0.22%, Ti: 0.20%, B: 0.001%.

[0039] In this example, the steel plate after rolling is heated from room temperature to 910°C at a heating rate of 12°C / S with the furnace, and then cooled to 100°C in a salt bath after being kept for 2.5H minutes, and then heated at a heating rate of 25°C / s from 100°C to 910°C. ℃ heated to 300 ℃ for 98 seconds, then kept at 160 ℃ for 6H minutes, and finally out of the oven and air-cooled to room temperature.

[0040] The mechanical performance test shows that the tensile strength of the wear-resistant steel is 1400MPa, the yi...

Embodiment 2

[0042] The low-alloy wear-resistant steel of this embodiment contains the following chemical elements: carbon 0.98%, Si: 3.3%, Mn: 0.25%, Ti: 0.22%, B: 0.003%.

[0043] After rolling, the steel plate is heated from room temperature to 850°C at a heating rate of 8°C / S with the furnace, cooled to 120°C in a salt bath after holding for 2.8H minutes, and then heated from 120°C to 281°C at a heating rate of 15°C / s Keep warm for 80 seconds, then keep warm at 250°C for 7H minutes, and finally take it out of the oven and air cool to room temperature.

[0044] The mechanical performance test shows that the tensile strength of the wear-resistant steel is 1480MPa, the yield strength is 1080MPa, the hardness value is 432HV, the elongation is 14.7%, and the impact toughness is 48J / cm2.

Embodiment 3

[0046] The low-alloy wear-resistant steel of this embodiment contains the following chemical elements: 0.55% carbon, 2.5% Si, 0.70% Mn, 0.30% Ti, and 0.005% B.

[0047] After rolling, the steel plate is heated from room temperature to 880°C at a heating rate of 20°C / S with the furnace, cooled to 249°C in a salt bath after holding for 3H minutes, and then heated from 249°C to 300°C at a heating rate of 20°C / s. 50 seconds, then keep warm at 180°C for 7.8H minutes, and finally take it out of the oven and air cool to room temperature.

[0048] The mechanical performance test shows that the tensile strength of the wear-resistant steel is 1502MPa, the yield strength is 1178MPa, the hardness value is 440HV, the elongation is 16.7%, and the impact toughness is 61J / cm2.

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Abstract

The invention discloses low-cost high-tenacity super wear-resistant steel. The steel comprises, by weight percentage, 0.40%-1.00% of C, 1.5%-3.5% of Si, 0.2%-0.8% of Mn, 0.20%-0.35% of Ti, 0.001%-0.005% of B and the balanced Fe. The invention further discloses a manufacturing method of the steel. According to the steel and the manufacturing method, the appropriate chemical element proportion and the heat treatment process are adopted, the tempered martensite is taken on the surface of the manufactured low-cost high-tenacity super wear-resistant steel as a main, the bayesian-retained austenite is taken on the core portion as a main, and therefore the tenacity of the steel is improved while the abrasion performance is strengthened.

Description

technical field [0001] The invention relates to a low-cost high-toughness super wear-resistant steel and a preparation method thereof, belonging to the technical field of low-alloy wear-resistant materials. Background technique [0002] At present, high toughness and wear-resistant materials are often required under the medium and low impact load wear conditions of mine screening plate linings, transportation chains, coal, and chemical industries. [0003] The high-toughness and wear-resistant materials currently used in China mainly include high-manganese steel, low-alloy cast iron, and low-alloy steel. The as-cast structure of high manganese steel is usually composed of austenite, carbide and pearlite. After water toughening treatment, under high impact conditions, the metal surface undergoes plastic deformation, and there is obvious work hardening in the deformed layer. The hardness of the surface layer is greatly improved; under low impact conditions, due to the insigni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 马玉喜郭斌陶军晖杜明宋畅
Owner 武汉钢铁有限公司
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