A kind of double-scale tic particle composite strengthening low-alloy super wear-resistant steel and manufacturing method thereof

A low-alloy, wear-resistant steel technology, applied in the field of metallurgy, can solve the problems of low performance and high hardness of high-grade wear-resistant steel, achieve the effect of improving wear resistance, ensuring strength and plastic toughness, and avoiding the increase of production processes

Active Publication Date: 2020-05-05
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that the hardness of high-grade wear-resistant steel is too high, and the performance of processing and welding is greatly reduced, which can no longer meet the requirements of some equipment that requires both ultra-high wear resistance and certain performance.

Method used

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  • A kind of double-scale tic particle composite strengthening low-alloy super wear-resistant steel and manufacturing method thereof
  • A kind of double-scale tic particle composite strengthening low-alloy super wear-resistant steel and manufacturing method thereof
  • A kind of double-scale tic particle composite strengthening low-alloy super wear-resistant steel and manufacturing method thereof

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Experimental program
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Effect test

preparation example Construction

[0041] The present invention also provides a preparation method of low-alloy super wear-resistant steel, comprising the following steps:

[0042] S1. Smelting: Prepare the raw materials required for smelting according to the weight percentage of the chemical composition of the above-mentioned low-alloy super wear-resistant steel; the raw materials are sequentially subjected to primary smelting in a converter, LF refining and RH refining to obtain molten steel for smelting.

[0043] S2. Solidification forming: the smelting molten steel is subjected to slab continuous casting or die casting to obtain a billet.

[0044] S3. Rolling: place the billet in a heating furnace and heat it to 1000-1250°C, and keep it warm for 3-8 hours; then use a medium-thick plate rolling mill or a hot continuous rolling mill to directly roll the billet after heating and heat preservation at high temperature for 8-16 passes , to obtain a steel plate with a thickness of 4-60 mm, and the rolling reductio...

Embodiment 1

[0050] S1. Smelting: According to the weight percentage of the chemical composition of low-alloy super wear-resistant steel, C: 0.45%, Si: 1.10%, Mn: 1.35%, Cr: 0.35%, Ti: 0.80%, Mo: 0.24%, B: 0.0005-0.003%, S: ≤0.005%, P: ≤0.015, the balance is iron and unavoidable impurity elements, and prepares the raw materials required for smelting; the raw materials are sequentially subjected to converter primary refining, LF refining and RH refining to obtain smelting molten steel.

[0051] S2. Solidification forming: the molten steel is subjected to slab continuous casting to obtain a billet. Use a scanning electron microscope to observe the billet, such as figure 1 As shown, it can be seen that the micron-sized TiC particles in the blank are segregated on the grain boundary.

[0052] S3. Rolling: place the billet in a heating furnace and heat it to 1200° C., and keep it warm for 4 hours; then use a plate rolling mill to directly roll the heated and kept warm billet for 11 passes at ...

Embodiment 2

[0057] S1. Smelting: According to the weight percentage of the chemical composition of low-alloy super wear-resistant steel, C: 0.40%, Si: 0.55%, Mn: 1.32%, Cr: 0.35%, Ti: 0.60%, Mo: 0.25%, B: 0.0005-0.003%, S: ≤0.005%, P: ≤0.015, the balance is iron and unavoidable impurity elements, and prepares the raw materials required for smelting; the raw materials are sequentially subjected to converter primary refining, LF refining and RH refining to obtain smelting molten steel.

[0058] S2. Solidification forming: the molten steel is subjected to slab continuous casting to obtain a billet.

[0059] S3. Rolling: place the billet in a heating furnace and heat it to 1200° C., and keep it warm for 5 hours; then use a plate rolling mill to directly roll the heated and kept warm billet for 15 passes at high temperature to obtain a steel plate with a thickness of 10 mm.

[0060] S4. Cooling: Cool the steel plate to 600°C at a cooling rate ≥10°C / s, and then perform stack cooling.

[0061]...

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Abstract

The invention relates to double-scale TiC particle compound reinforced low alloy super wear-resistant steel which is prepared from the following chemical components in percent by weight: 0.18-0.60% ofC, 0.30-1.20% of Si, 1.00-3.00% of Mn, 0.20-0.40% of Cr, 0.2-1.00% of Ti, 0.10-0.50% of Mo, 0.0005-0.003% of B, less than or equal to 0.005% of S, less than or equal to 0.015% of P and the balance iron and inevitable impurity elements, wherein the contents of C and Ti meet a relationship as follows: C%-Ti% is greater than or equal to 0.10% but less than or equal to 0.40%. The low alloy super wear-resistant steel contains double-scale TiC particles: micron TiC particles and nanoscale TiC particles which are distributed uniformly. A preparation method of the super wear-resistant steel comprisesthe following steps: smelting, consolidation forming, rolling, cooling and thermal treatment. The cooling step comprises the steps of cooling the rolled steel super-quickly to 450-750 DEG C; and carrying out stack cooling. Hardness of the wear-resistant steel is HB360-550, the wear-resistant performance is 1.5-3.0 times of that of a conventional super wear-resistant steel plate in the same hardness, and the using performance meets the using demand of related equipment.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a double-scale TiC particle composite reinforced low-alloy super wear-resistant steel and a manufacturing method thereof. Background technique [0002] Low-alloy wear-resistant steel is widely used in construction machinery, mining machinery, transportation machinery, metallurgical machinery and other fields due to its low cost, simple process, and good comprehensive performance. [0003] The matrix structure of low-alloy wear-resistant steel is mainly martensite or tempered martensite, and its wear-resistant performance is directly related to the hardness of the martensite matrix, that is, the higher the grade of low-alloy wear-resistant steel, the higher the hardness; The reason is that low-alloy wear-resistant steel relies on the hardness of the substrate to resist wear. The wear mechanism is micro-cutting or micro-ploughing. Simply increasing the hardness only ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/60C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0263C22C38/008C22C38/02C22C38/04C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/60
Inventor 王昭东邓想涛黄龙王麒付天亮田勇
Owner NORTHEASTERN UNIV LIAONING
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