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Preparation method for air-cooled lower bainite/martensite multi-phase wear-resistant cast steel

A technology of bainite and martensite, which is applied in the field of preparation of bainite/martensite composite phase wear-resistant cast steel under air cooling, can solve the problems of application limitations and low impact toughness, and achieve the effect of broad application prospects

Inactive Publication Date: 2011-12-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the impact toughness of 5% Cr air-hardened wear-resistant cast steel is low, and the application of 5% Cr air-hardened wear-resistant cast steel is greatly restricted in the occasions where impact toughness is required

Method used

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  • Preparation method for air-cooled lower bainite/martensite multi-phase wear-resistant cast steel

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preparation example Construction

[0021] The preparation method of the air-cooled bainite / martensite composite phase wear-resistant cast steel proposed by the present invention comprises the following steps:

[0022] (1) After being smelted by the conventional steelmaking process, it is casted by sand casting or precision casting process, so that the weight percentage of each component in the cast steel is:

[0023] C: 0.35-0.48wt.%;

[0024] Si: 0.10-0.90wt.%;

[0025] Mn: 1.90-3.50wt.%;

[0026] Cr: 0.30-0.80wt.%;

[0027] P: 0.01-0.03wt.%;

[0028] S: 0.01-0.03wt.%;

[0029] B: 0-0.008wt.%;

[0030] Rare earth Ce: 0.01-0.26wt.%;

[0031] The rest is Fe;

[0032] (2) Heating the above-mentioned cast steel to 850-900° C. for austenitization, keeping the temperature for 2-5 hours, and then cooling the furnace to room temperature for annealing treatment.

[0033] (3) Heating the above-mentioned cast steel to 830-860°C for austenitization, keeping it warm for 1-2 hours, then air cooling or air cooling to...

Embodiment 1

[0039] (1) After being smelted by the conventional steelmaking process, it is casted by sand casting or precision casting process, and the Kiel sample is poured at the same time.

[0040] (2) Heat the above-mentioned cast steel to 880°C for austenitization, keep it warm for 3 hours, and then cool it to room temperature for annealing.

[0041] (3) Heat the above-mentioned cast steel to 860°C for austenitization, keep it warm for 1 hour, and air-cool to 120°C.

[0042] (4) Heating the above-mentioned cast steel to 220° C., holding the temperature for 3 hours and performing tempering treatment.

Embodiment 2

[0044] (1) After being smelted by the conventional steelmaking process, it is casted by sand casting or precision casting process, and the Kiel sample is poured at the same time.

[0045] (2) Heat the above-mentioned cast steel to 880°C for austenitization, keep it warm for 3 hours, and then cool it to room temperature for annealing.

[0046] (3) Heat the above-mentioned cast steel to 860°C for austenitization, keep it warm for 1 hour, and air-cool to 110°C.

[0047] (4) Heating the above-mentioned cast steel to 230° C., holding the temperature for 3 hours and performing tempering treatment.

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Abstract

The invention relates to a preparation method for air-cooled lower bainite / martensite multi-phase wear-resistant cast steel and belongs to the field of low-alloy wear-resistant cast steel. Mn is used as a main alloy element, a small amount of alloy elements such as Cr, B, rare earth elements (La, Ce, Nb, pr) and the like are added, and the balance is Fe. The materials are smelted by a conventional steel making technique; and after being cast and moulded, the steel is subjected to austenising, air cooling or wind cooling, heating, heat preservation and low-temperature annealing. The wear-resistant cast steel after the air cooling consists of lower bainite / martensite and a small amount of granulous bainite. The hardness of the cast steel is more than 50 (HRC), and the unnotched impact energy AK of the cast steel is more than 50 J. The wear-resistant cast steel has the advantages of a small amount of alloy elements, good strength-toughness combination and wear resistance, simple technique, low cost and capability of manufacturing various low-alloy wear-resistant cast steel parts, and particularly has unique advantage for the wear-resistant cast steel parts with complex shapes and structures and large sizes and susceptible to cracking during quenching.

Description

technical field [0001] The invention relates to a preparation method of air-cooled bainite / martensite composite phase wear-resistant cast steel, belonging to the field of low-alloy wear-resistant cast steel. Background technique [0002] Wear-resistant cast steel is a very important class of metal structural materials. Compared with cast iron, cast steel has higher strength, plasticity, toughness and weldability, and is widely used in modern industry and agriculture. For example, in rolling steel, forging, transportation, power generation, mining, petroleum, chemical industry, weapons and other equipment, the blanks of many wear-resistant parts are steel castings. Developed countries in Europe and the United States have developed a series of wear-resistant cast steels in order to meet the material requirements of wear-resistant steel castings. Among them, there are four types of typical wear-resistant cast steel: strong wear-resistant cast steel, SL super wear-resistant ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C21D1/26
Inventor 白秉哲罗开双郑燕康
Owner TSINGHUA UNIV
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