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A method for improving the performance of alloyed high manganese steel castings

A technology of casting performance and high manganese steel is applied in the field of improving the performance of alloyed high manganese steel castings, which can solve the problems of coarse austenite grain size, etc., so as to improve yield strength, improve wear resistance, and promote austenite decomposition. Effect

Active Publication Date: 2020-08-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese invention patent CN106282744 discloses a water toughening treatment process for high manganese steel liners of ball mills, which is characterized in that the specific steps include: heating the high manganese steel castings together with the furnace to 1040°C~1110°C for 3~4 hours , quickly out of the furnace and quenched in water, the large-sized carbides in the obtained high manganese steel structure are basically eliminated, the toughness and plasticity are good, but the austenite grain size is coarse, and the yield strength and hardness are insufficient.

Method used

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  • A method for improving the performance of alloyed high manganese steel castings
  • A method for improving the performance of alloyed high manganese steel castings
  • A method for improving the performance of alloyed high manganese steel castings

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Embodiment 1

[0022] A method for improving the performance of alloyed high manganese steel castings, using Ti-V-Nb alloying and combining with a new heat treatment process to precipitate nano- and micro-scale dual-scale precipitates in the high manganese steel, specifically including the following steps:

[0023] (1) According to the chemical composition of high manganese steel raw materials (C: 0.81%; Mn: 17.1%; Si: 0.79%; Cr: 1.95%; Ti: 0.09%; V: 0.43%; Nb: 0.26%; Mo: 0.72 %; Ni: 0.29%; P: 0.001%; ​​S: 0.003%, the remainder is Fe and unavoidable impurities) for compounding, then smelting, and casting to obtain high manganese steel castings with a size of 200mm×50mm×50mm.

[0024] (2) Sectional heating and heat preservation: heat the ultra-high manganese castings obtained in step (1) to 450°C and hold for 90 minutes; after the heat preservation, heat to 650°C for 90 minutes; after the heat preservation, heat to 850°C, heat preservation In 90 minutes, the heating rate of each stage is 65°C / h.

...

Embodiment 2

[0027] A method for improving the performance of alloyed high manganese steel castings, using Ti-V-Nb alloying and combining with a new heat treatment process to precipitate nano- and micro-scale dual-scale precipitates in the high manganese steel, specifically including the following steps:

[0028] (1) According to the chemical composition of high manganese steel raw materials (C: 0.92%; Mn: 18.3%; Si: 0.78%; Cr: 1.99%; Ti: 0.11%; V: 0.42%; Nb: 0.24%; Mo: 0.74 %; Ni: 0.3%; P: 0.002%; S: 0.003%, the balance is Fe and unavoidable impurities) for batching, then smelting, casting to obtain high manganese steel castings with a size of 100mm×30mm×30mm.

[0029] (2) Sectional heating and heat preservation: the ultra-high manganese casting obtained in step (1) is heated to 470°C and held for 60 minutes; after the heat preservation is completed, it is heated to 670°C for 60 minutes; after the heat preservation is completed, it is heated to 870°C, Keep the temperature for 60 minutes, and t...

Embodiment 3

[0032] A method for improving the performance of alloyed high manganese steel castings, using alloying to increase the Mn / C ratio in the steel, combined with a new heat treatment process, to precipitate nano- and micro-scale dual-scale precipitates in the high manganese steel, including the following step:

[0033] (1) According to the chemical composition of high manganese steel raw materials (C: 0.95%; Mn: 18.7%; Si: 0.79%; Cr: 2.01%; Ti: 0.13%; V: 0.44%; Nb: 0.26%; Mo: 0.75 %; Ni: 0.31%; P: 0.003%; S: 0.003%, the balance is Fe and unavoidable impurities) for batching, then smelting, casting to obtain high manganese steel castings with a size of 150mm×40mm×40mm.

[0034] (2) Sectional heating and heat preservation: the ultra-high manganese casting obtained in step (1) is heated to 430°C and held for 80 minutes; after the heat preservation is completed, it is heated to 630°C for 80 minutes; after the heat preservation is completed, it is heated to 830°C, Keep the temperature for ...

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Abstract

The invention discloses a method for improving property of an alloying high-manganese steel casting and belongs to the technical field of heat treatment technology of high-manganese steel castings. The method for improving the property of the alloying high-manganese steel casting comprises the steps that alloying of Ti-V-Nb is adopted, and a novel heat treatment technology is combined so that a nanoscale and micrometer-level double-measure precipitated phase is separated out from high-manganese steel. The heat treatment technology comprises segmented heating and heat preservation and quenching. The segmented heating and heat preservation comprise the steps that the alloying superhigh-manganese casting is heated to the temperature ranging between 430 DEG C and 470 DEG C, and heat preservation is conducted; then the alloying superhigh-manganese casting is heated to the temperature ranging between 630 DEG C and 670 DEG C, and heat preservation is conducted; and then the temperature is raised to between 830 DEG C and 870 DEG C, and heat preservation is conducted. The high-manganese steel subjected to segmented heating and heat preservation treatment is heated to the temperature rangingbetween 1060 DEG C and 1080 DEG C, and water quenching is conducted after heat preservation is finished. According to the method for improving the property of the alloying high-manganese steel casting, through reasonable component design, with the novel heat treatment technology combined, microstructures in the steel and separation-out of the double-measure precipitated phase are adjusted and controlled; a high-manganese steel workpiece acquired finally has higher yield strength and surface hardness; and meanwhile, enough impact toughness is guaranteed.

Description

Technical field [0001] The invention relates to a method for improving the performance of alloyed high manganese steel castings, and belongs to the technical field of high manganese steel casting heat treatment technology. Background technique [0002] Semi-automatic grinding machine is a large-scale grinding equipment widely used in mining industry. Among them, the liner of the mill is the most worn part due to high impact wear during the grinding process. In recent years, most of the mill liner materials are made of ZGMn13Cr2, because it has good toughness and strong work hardening ability when subjected to severe impact. However, with the increase in the output of semi-automatic mills, traditional high-manganese steel liners can no longer meet the requirements of harsh working conditions. Jaw crushers are widely used in the crushing of ore and bulk materials in a variety of industries, and the jaw plate of the jaw crusher is directly in contact with the material during use, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C22C38/02C22C38/58C22C38/50C22C38/46C22C38/48C22C38/44
CPCC21D1/18C21D2211/001C21D2211/004C22C38/02C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 山泉周再峰李祖来蒋业华葛茹
Owner KUNMING UNIV OF SCI & TECH