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High-strength and high-tenacity low-alloy wear-resistant steel and preparing method thereof

A high-strength toughness, low-alloy technology, applied in the field of low-alloy wear-resistant steel, can solve the problems of unguaranteed hardness and insignificant toughness improvement, and achieve the effect of isothermal transformation

Active Publication Date: 2016-05-11
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After tempering, low temperature tempering does not significantly improve toughness, medium temperature tempering will produce temper brittleness, high temperature tempering will significantly improve impact toughness but hardness cannot be guaranteed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The chemical composition percentage of low alloy wear-resistant steel is: C: 0.52%, Si: 1.20%, Mn: 1.0%, Cr: 0.30%, Mo: 0.20%, Cu: 0.50%, Re: 0.10%, P: 0.025% , S: 0.025%, the rest are Fe and inevitable impurities.

[0024] Smelted in a 1t alkaline induction furnace. The metal charge is pig iron for steelmaking, returned carbon steel, ferrosilicon, ferrochromium, ferromolybdenum, scrap copper, rare earth (Re, one or more of all rare earth elements), among which iron alloys (ferrosilicon, ferrochromium) , molybdenum iron) after crushing and adding, the particle size is 10-20mm, and the feeding is calculated according to the above formula. Lost foam casting is adopted, and the pouring temperature is 1560-1600 °C. After the casting is cooled to 800-900 °C, the shell is removed and air-cooled to room temperature.

[0025] Then, the casting was heated up to 850 ℃ in the heating equipment at a rate of 4 ℃ per minute for austenitization, and then the casting was taken out an...

Embodiment 2

[0028] The chemical composition percentage of low alloy wear-resistant steel is: C: 0.4%, Si: 0.6%, Mn: 0.3%, Cr: 0.25%, Mo: 0.15%, Cu: 0.40%, Re: 0.10%, P: 0% , S: 0%, the rest are Fe and inevitable impurities.

[0029] Smelted in a 1t alkaline induction furnace. The metal charge is pig iron for steelmaking, returned carbon steel, ferrosilicon, ferrochromium, ferromolybdenum, scrap copper, rare earth (Re, one or more of all rare earth elements), among which iron alloys (ferrosilicon, ferrochromium) , molybdenum iron) after crushing and adding, the particle size is 10-20mm, and the feeding is calculated according to the above formula. Lost foam casting is adopted, and the pouring temperature is 1560-1600 °C. After the casting is cooled to 800-900 °C, the shell is removed and air-cooled to room temperature.

[0030] Then, the casting was heated up to 820°C in the heating equipment at a rate of 2°C per minute for austenitization, and then the casting was taken out and put into...

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Abstract

The invention discloses high-strength and high-tenacity low-alloy wear-resistant steel and a preparing method thereof. The high-strength and high-tenacity low-alloy wear-resistant steel comprises the following components in a percent by mass: 0.40-0.60 of C, 0.60-1.2 of Si, 0.30-1.0 of Mn, 0.25-0.35 of Cr, 0.15-0.25 of Mo, 0.40-0.60 of Cu, 0.10-0.15 of Re, 0-0.025 of P, 0-0.025 of S and the balance of Fe and unavoidable impurities. A liquid quenching hot isothermal quenching heating processing technology used as a heating processing technology in the preparing method comprises the following steps: 1), heating a casting obtained through casting to 820-860DEG C and carrying out austenization; 2), placing the casting in a quenching medium and carrying out quenching; 3), taking out the casting after the surface temperature of the casting is cooled to 200-320DEG C; and 4), immediately transferring the hot casting into a 260-330DEG C heat holding furnace, carrying out bainite isothermal transformation for 1-2h, and then taking out and air-cooling the casting. The bainite structure of the obtained workpiece is fine, the inner structure is lower bainite, and the central structure is upper bainite plus lower bainite. The structure distribution surface is high in strength, great in hardness, resistant to wear and great in central structure tenacity. The high-strength and high-tenacity low-alloy wear-resistant steel is particularly suitable for bucket teeth, crankshafts and the like.

Description

technical field [0001] The invention relates to a low-alloy wear-resistant steel, in particular to a bainite / martensite composite phase high-strength-toughness low-alloy wear-resistant steel and a preparation method thereof. Background technique [0002] Engineering, mining, construction, agriculture, cement production and other machinery and equipment with harsh working conditions, such as excavators, loaders, bulldozers, etc., require not only high hardness to resist wear but also certain impact resistance to steel. According to different conditions of use, there are also differences in the performance requirements of wear-resistant steel products. Wear-resistant steels with different hardness and toughness should be used to achieve the purpose of extending the service life of mechanical equipment. At present, low-alloy wear-resistant steels usually have low impact toughness and instability in production, which leads to problems such as easy fracture of steel plates and po...

Claims

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Application Information

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IPC IPC(8): C22C38/18C22C38/16C22C38/12C22C38/04C22C38/02C22C33/06C21D1/00C21D1/18
CPCC21D1/00C21D1/18C21D2211/002C22C33/06C22C38/005C22C38/02C22C38/04C22C38/12C22C38/16C22C38/18Y02P10/20
Inventor 魏德强张晓媛高浩钟盛李新凯王荣
Owner GUILIN UNIV OF ELECTRONIC TECH
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