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High-boron low-carbon abrasion resistant cast steel and heat treatment method thereof

A heat treatment method and steel casting technology, which is applied in the field of steel materials, can solve problems such as high brittleness, achieve the effects of improving the hardness of cast steel, low production costs, and improving the wear resistance of cast steel

Inactive Publication Date: 2008-09-10
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cast steel contains more high-hardness borides and has better wear resistance, but the matrix is ​​martensite and is more brittle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Using a 500 kg medium frequency induction furnace to melt high boron and low carbon wear-resistant cast steel, the manufacturing process steps are:

[0034] 1) Use scrap steel, ferroboron, ferrosilicon, ferrochromium, and ferromanganese as ingredients, and adjust the carbon content with waste graphite electrodes. After the molten steel is melted and the composition is adjusted before the furnace, the temperature is raised to 1592°C, and 0.24% of the mass of the molten steel is added. Aluminum deoxidation, and then out of the furnace;

[0035] 2) Crushing the cerium-based rare earth, ferro-titanium and ferro-vanadium into small pieces with a particle size of less than 12mm, drying at 180-200°C, placing them at the bottom of the ladle, and compounding and modifying the molten steel by pouring into the ladle;

[0036] 3) pouring molten steel into castings after metamorphic treatment;

[0037] 4) After the casting is austenitized at 900°C×2h, it is directly austempered in ...

Embodiment 2

[0043] Using a 500 kg medium frequency induction furnace to melt high boron and low carbon wear-resistant cast steel, the manufacturing process steps are:

[0044] 1) Use scrap steel, ferroboron, ferrosilicon, ferrochrome, and ferromanganese as ingredients, adjust the carbon content with pig iron, melt the molten steel, adjust the composition before the furnace, raise the temperature to 1598°C, and add aluminum deoxidation accounting for 0.30% of the mass of molten steel , and then released;

[0045] 2) Crushing the cerium-based rare earth, ferro-titanium and ferro-vanadium into small pieces with a particle size of less than 12mm, drying at 180-200°C, placing them at the bottom of the ladle, and compounding and modifying the molten steel by pouring into the ladle;

[0046] 3) pouring molten steel into castings after metamorphic treatment;

[0047] 4) After the casting is austenitized at 920℃×1h, it is directly austempered in an isothermal salt bath furnace at a temperature of...

Embodiment 3

[0053] Using a 750 kg medium frequency induction furnace to melt high boron and low carbon wear-resistant cast steel, the manufacturing process steps are:

[0054] 1) Use scrap steel, ferroboron, ferrosilicon, ferrochrome, and ferromanganese as ingredients, adjust the carbon content with pig iron, melt the molten steel, adjust the composition before the furnace, raise the temperature to 1581°C, and add 0.15% of the mass of the molten steel to deoxidize aluminum , and then released;

[0055] 2) Crushing the cerium-based rare earth, ferro-titanium and ferro-vanadium into small pieces with a particle size of less than 12mm, drying at 180-200°C, placing them at the bottom of the ladle, and compounding and modifying the molten steel by pouring into the ladle;

[0056] 3) pouring molten steel into castings after metamorphic treatment;

[0057] 4) After the casting is austenitized at 880°C for 3h, it is directly austenitized in an isothermal salt bath furnace at a temperature of 300...

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PUM

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Abstract

The invention relates to high-boron low-carbon wearproof cast steel and a heat treatment method thereof, which belongs to the steel material technical field. The cast steel comprises the following chemical compositions in percentage by weight (wt percent): 0.15 to 0.30 percent of C, 1.5 to 2.5 percent of B, 2.6 to 3.0 percent of Si, 1.4 to 1.8 percent of Cr, 0.5 to 0.8 percent of Mn, 0.05 to 0.12 percent of Ce, 0.03 to 0.15 percent of V, 0.03 to 0.15 percent of Ti, less than 0.05 percent of P, less than 0.05 percent of S, the balance being Fe, the content of v and Ti is more than 0.01 and less than 0.25. In the invention, a casting is kept between 880 DEG C and 920 DEG C for 1h to 3h, treated by isothermal quench in an isothermal salt bath furnace with the temperature between 250 DEG C and 300 DEG C, is kept for 2h to 4h and later cooled in the air to room temperature, thereby obtaining the high-boron low-carbon wearproof cast steel. Compared with the prior art, the cast steel and the technology of the invention have the advantages of good plasticity and toughness, high wear resistance , low cost, etc.

Description

technical field [0001] The invention belongs to the technical field of iron and steel materials, and in particular relates to a high-boron, low-carbon wear-resistant cast steel and a heat treatment method thereof. Background technique [0002] Wear is the most important way among the three damage modes (wear, corrosion, fracture) of engineering components. The loss caused by wear in the world reaches hundreds of billions of dollars every year. Therefore, it is of great importance to study wear and continuously develop wear-resistant materials with better performance. economic significance. At present, there are three types of wear-resistant materials: (1) austenitic high manganese steel, the original state is austenite, under strong external impact and high pressure stress, the transformation and strengthening of austenite to martensite occurs, and the surface layer It has high hardness, good toughness inside, excellent wear resistance and reliability. (2) Low-alloy wear-r...

Claims

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Application Information

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IPC IPC(8): C22C38/60C22C38/34C21C5/52C21C7/04C21D1/607
CPCY02P10/20
Inventor 符寒光雷永平邢建东
Owner BEIJING UNIV OF TECH
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