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Boron contg. multi-element low alloyed wearable cast steel and prepn. thereof

A low-alloy, multi-component technology, applied in the field of wear-resistant metal materials, can solve the problems of increasing production costs, achieve the effect of improving strength and wear resistance, improving mechanical properties, and simple heat treatment process

Inactive Publication Date: 2006-09-20
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After heat treatment, this alloy cast steel has a microstructure of martensite plus bainite and a small amount of retained austenite. It has good strength, toughness and wear resistance, and its service life is more than double that of high manganese steel. But containing expensive molybdenum will increase the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The boron-containing multi-element low-alloy wear-resistant cast steel of this embodiment is smelted in a 500kg intermediate frequency induction electric furnace. First, use scrap steel, ferrosilicon, ferrochromium, and ferromanganese as ingredients, add carbon with pig iron, melt molten steel, adjust the composition before the furnace, and raise the temperature to 1630 ℃, add silicon-calcium alloy, ferroboron, ferro-titanium and containing Nitrochromium iron is then released. The yttrium-based rare earth magnesium alloy and potassium-containing material are crushed into small pieces with a particle size of less than 15mm, dried at 160°C, and placed at the bottom of the ladle, and the molten steel is compositely modified by the ladle flushing method. After the modification treatment, the molten steel is poured into a casting, and the molten steel pouring temperature is 1490°C. After the casting is austenitized at 960℃×1h, it is rapidly cooled, and then kept at 280℃ for 2.5h...

Embodiment 2

[0040] The boron-containing multi-element low-alloy wear-resistant cast steel of this embodiment is smelted in a 1500kg electric arc furnace. First, use scrap steel, ferrosilicon, ferrochrome, and ferromanganese as ingredients, use waste graphite electrodes to increase carbon, melt the molten steel, adjust the composition before the furnace, and raise the temperature to 1655°C. Add silicon-calcium alloy, ferro-boron, and ferro-titanium before the furnace is discharged And nitrogen-containing ferrochromium, and then baked. The yttrium-based rare earth magnesium alloy and potassium-containing material are crushed into small pieces with a particle size of less than 15mm, dried at 150°C, placed at the bottom of the ladle, and the molten steel is compositely modified by the ladle flushing method. After the modification treatment, the molten steel is poured into a casting, and the molten steel pouring temperature is 1508℃. After the casting is austenitized at 880℃×3.5h, it is rapidly co...

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Abstract

This invention discloses a multi-element low alloy abrasion-resisting cast steel, which is composed of C 0.20-0.45 wt.%, Mn 1.1-1.8 wt.%, Si 0.8-1.5 wt.%, Cr 0.3-1.2 wt.%, B 0.05-0.20 wt.%, Ti 0.08-0.30 wt.%, N 0.03-0.20 wt.%, Ca 0.05-0.15 wt.%, K 0.04-0.15 wt.%, and the rest is Fe and inavoidable impurities. The cast steel is manufactured by: (1) mixing scrapped steel, silicon iron, chromium iron and manganese iron, (2) carrying out carburization by using scrapped graphite electrode or pig iron, (3) melting to obtain liquid steel and adjusting the components until being qualified, (4) heating the liquid steel to 1620-1660 deg.C, (5) adding Si-Ca alloy, boron iron, titanium iron and nitrogen-containing chromium iron, and then pouring out of the furnace, (6) pulverizing Y-based rare earth magnesium alloy and potassium-containing substances to granules whose sizes are less than 15 mm, (7) drying at 130-180 deg.C, (8) placing at the bottom of the ladle, (9) carrying out modification treatment by pour-over process, and casting at 1480-1520 deg.C, (10) austenitizing at 830-1050 deg.C for 0.5-4 h, (11) rapidly cooling, (12) keeping the temperature at 150-300 deg.C, and (13) cooling in a furnace or in the air.

Description

Technical field [0001] The invention belongs to the technical field of wear-resistant metal materials, and relates to a wear-resistant cast steel and a preparation method thereof, in particular to a boron-containing multi-element low-alloy wear-resistant cast steel without precious alloy elements such as molybdenum and nickel, and a preparation method thereof. Background technique [0002] Abrasion is widespread in many industrial sectors such as metallurgy, mining, machinery, electricity, coal, petroleum, transportation, aviation, and military industry. It has become an important cause of equipment failure or material damage, and it is also one of the most economic losses. Research and The development of a new generation of wear-resistant materials to reduce metal wear is of great significance to the national economy. At present, the widely used wear-resistant materials mainly include alloy steel and white cast iron. The former has good toughness, but has ...

Claims

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Application Information

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IPC IPC(8): C22C38/28C22C33/04B22D11/16C21D11/00
Inventor 符寒光邢建东
Owner XI AN JIAOTONG UNIV
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