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Preparation method of low-alloy manganese martensite wear resistant cast steel

A tempered martensite and low-alloy technology, which is applied in the field of low-alloy wear-resistant cast steel preparation, can solve the problems of high cost, large heat treatment energy consumption, and many alloy elements in wear-resistant cast steel, so as to achieve low cost and low alloy element Less content, excellent combination of strength and toughness

Inactive Publication Date: 2012-01-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After the SL super wear-resistant cast steel is cast, the heat treatment process is 1200°C homogenization treatment, 840°C water quenching and 150°C low temperature tempering for a long time aging, and the heat treatment consumes a lot of energy
Therefore, the quenched and tempered martensitic CrNiMo wear-resistant cast steel has many alloying elements and high cost. In order to obtain good strength and toughness, a large amount of precious alloying element Ni has to be consumed.

Method used

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  • Preparation method of low-alloy manganese martensite wear resistant cast steel

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preparation example Construction

[0020] The preparation method of the low-alloy manganese series tempered martensitic wear-resistant cast steel proposed by the present invention comprises the following steps:

[0021] (1) After being smelted by the conventional steelmaking process, it is cast by sand casting or precision casting process, and the weight percentage of each component in the steel is:

[0022] C: 0.28~0.48wt.%;

[0023] Si: 0.20~1.50wt.%;

[0024] Mn: 1.85~3.50wt.%;

[0025] Cr: 0.30~0.90wt.%;

[0026] Cu: 0~0.90wt.%;

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

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

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

[0030] Rare earth Ce: 0.05~0.25wt.%;

[0031] The rest is Fe;

[0032] (2) Heating the above-mentioned cast steel to 830-900°C for austenitization, keeping the temperature for 2-5 hours, and then cooling to room temperature for annealing;

[0033] (3) Heating the above-mentioned cast steel to 830-900°C for austenitization, and water quenching to 80-150°C after heat preservation for 1-2 hours; ...

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 to austenitize, keep it warm for 1 hour and then quench 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. to austenitize, and then quench to 110° C. after holding for 1 hour.

[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 of low-alloy manganese martensite wear resistant cast steel, which belongs to the technical field of low-alloy wear resistant cast steel preparation. The method adopts Mn as the main alloy element, and adds a small amount of Si, Cr, Cu, B and rare earth elements (La, Ce, Nb, Pr) and other alloy elements, and the balance of Fe. The method adopts a conventional steelmaking process to smelt, casts, forms, water quenches after austenitizing, heats, insulates heat and tempers at low temperature. The produced wear resistant cast steel is organized into tempered martensite after being water quenched and tempered. The tensile strength Rm of the cast steel is more than 1800MPa, the regulated non-proportional extension strength Rp0.2 is more than 1600MPa, the elongation after break A is more than 5 percent, the unnotched impact toughness aK is more than 150J / cm<2> and the U-shaped notch impact energy aKU is more than 20J / cm<2>. The wear resistant cast steel has the advantages of low alloy element content, strong toughness and wear resistance, simple process and low cost, and can be used for manufacturing bucket teeth, hammers, tooth plates, linings, crawler boards and other wear resistant cast steel.

Description

technical field [0001] The invention relates to a method for preparing low-alloy manganese-based tempered martensitic wear-resistant cast steel, and belongs to the technical field of low-alloy wear-resistant cast steel preparation. Background technique [0002] In industrial and agricultural production, agricultural machinery, steel rolling, forging, transportation, power generation, mining, petroleum, chemical industry, weapons and other fields have a very large demand for wear-resistant cast steel. Low-alloy quenched and tempered martensitic wear-resistant cast steel generally uses precious elements such as Cr, Ni, Mo as the main alloying elements. The carbon content is selected to be 0.34-0.38wt.%. The tempered martensite structure is obtained by austenitizing at 850-900°C and then water quenching, and then tempering at a low temperature of 200-300°C. The hardness of this low-alloy quenched and tempered martensitic wear-resistant cast steel can reach more than 50HRC, but...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C22C38/20C22C33/04
Inventor 白秉哲罗开双郑燕康
Owner TSINGHUA UNIV
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