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High-strength toughness low-alloy wear-resistant steel and preparation 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: 2017-05-17
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 is Fe and unavoidable impurities.

[0024] Melting with 1t alkaline induction furnace. The metal charge is pig iron for steelmaking, returned carbon steel, ferrosilicon, ferrochrome, ferromolybdenum, scrap copper, rare earth (Re, one or more of all rare earth elements), and the ferroalloy (ferrosilicon, ferrochrome , ferromolybdenum) after being crushed and added, the particle size is 10-20mm, and the feeding is calculated according to the above formula. The lost foam casting is adopted, and the pouring temperature is 1560-1600°C. After the pouring is completed, when the casting is cooled to 800-900°C, the shell is removed and air-cooled to room temperature.

[0025] Then, the casting is heated up to 850°C at a rate of 4°C per minute in the heating equipment for austenitization, and then th...

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 is Fe and unavoidable impurities.

[0029] Melting with 1t alkaline induction furnace. The metal charge is pig iron for steelmaking, returned carbon steel, ferrosilicon, ferrochrome, ferromolybdenum, scrap copper, rare earth (Re, one or more of all rare earth elements), and the ferroalloy (ferrosilicon, ferrochrome , ferromolybdenum) after being crushed and added, the particle size is 10-20mm, and the feeding is calculated according to the above formula. The lost foam casting is adopted, and the pouring temperature is 1560-1600°C. After the pouring is completed, when the casting is cooled to 800-900°C, the shell is removed and air-cooled to room temperature.

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

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PUM

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Abstract

The invention discloses a high-strength toughness low-alloy wear-resistant steel and a preparation method thereof. The high-strength toughness low-alloy wear-resistant steel has the following mass percentages of components: C: 0.40-0.60, Si: 0.60-1.2, Mn: 0.30-1.0 , Cr: 0.25‑0.35, Mo: 0.15‑0.25, Cu: 0.40‑0.60, Re: 0.10‑0.15, P: 0‑0.025, S: 0‑0.025, and the rest are Fe and unavoidable impurities. The heat treatment process in the preparation method is a liquid quenching zone temperature isothermal quenching heat treatment process, including: 1) heating the casting obtained from casting to 820-860°C for austenitization; 2) quenching the casting in a quenching medium; 3) Take it out when the surface temperature of the casting is cooled to 200-320°C; 4) Immediately transfer the casting to a holding furnace at 260-330°C for bainite isothermal transformation, the transformation time is 1-2h, and then take it out for air cooling. The bainite structure of the obtained workpiece is fine, the inner structure is lower bainite, and the core structure is upper bainite plus lower bainite. This kind of tissue distribution surface has high strength, good hardness, wear resistance, and the core tissue has good toughness. Especially suitable for bucket teeth, crankshafts, etc.

Description

technical field [0001] The invention relates to a low-alloy wear-resistant steel, in particular to a bainite / martensite multi-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 mechanical equipment with harsh working conditions, such as excavators, loaders, bulldozers, etc., require not only high hardness for steel to resist wear, but also certain impact resistance. 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 prolonging the service life of mechanical equipment. At present, the impact toughness of low-alloy wear-resistant steel is usually low and unstable in production, which leads to problems such as easy fracture of the steel plate under ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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