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Boron-containing casting die steel and preparation method thereof

A mold steel and boron casting technology, which is applied in the field of boron-containing casting mold steel and its preparation, can solve the problems of increased mold production costs, and achieve the effects of low production costs, improved mold wear resistance, and excellent wear resistance

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

However, because the mold material contains more chromium elements, expensive alloy elements such as nickel, copper, and tungsten are also added to improve the hardenability and wear resistance of the mold, resulting in an increase in mold production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Melting boron-containing casting mold steel with a 500 kg medium-frequency induction furnace, the manufacturing process steps are:

[0034] ① Mix steel scrap, ferrochrome and pig iron into the furnace to heat and melt, and then add ferrosilicon and ferromanganese in turn after molten steel is melted;

[0035] ② After adjusting the ingredients before the furnace, the temperature is raised to 1572°C, then aluminum is added for deoxidation and alloying, then ferro-titanium and ferro-boron are added in sequence, and the temperature of molten steel is raised to 1618°C;

[0036] ③Crush the rare earth magnesium alloy and nitrogen-containing ferrochrome into small pieces with a particle size of 6-10mm, dry them at 150-180°C, place them at the bottom of the ladle, and perform compound modification treatment on the molten steel by pouring into the ladle;

[0037] ④ Pouring molten steel into refractory product molds, the pouring temperature of molten steel is 1493°C;

[0038] ⑤ A...

Embodiment 2

[0045] Using a 1000 kg medium frequency induction furnace to melt boron-containing casting die steel, the manufacturing process steps are:

[0046] ① Mix steel scrap, ferrochrome and pig iron into the furnace to heat and melt, and then add ferrosilicon and ferromanganese in turn after molten steel is melted;

[0047] ② After adjusting the composition before the furnace, the temperature is raised to 1555°C, then aluminum is added for deoxidation and alloying, then ferro-titanium and ferro-boron are added in sequence, and the temperature of molten steel is raised to 1597°C;

[0048] ③Crush the rare earth magnesium alloy and nitrogen-containing ferrochrome into small pieces with a particle size of 6-10mm, dry them at 150-180°C, place them at the bottom of the ladle, and perform compound modification treatment on the molten steel by pouring into the ladle;

[0049] ④ Pouring molten steel into refractory product molds, the pouring temperature of molten steel is 1489°C;

[0050] ⑤ ...

Embodiment 3

[0057] Melting boron-containing casting mold steel with a 750 kg medium frequency induction furnace, the manufacturing process steps are:

[0058] ① Mix steel scrap, ferrochrome and pig iron into the furnace to heat and melt, and then add ferrosilicon and ferromanganese in turn after molten steel is melted;

[0059] ② After adjusting the composition before the furnace, the temperature is raised to 1569°C, then aluminum is added for deoxidation and alloying, then ferro-titanium and ferro-boron are added in sequence, and the temperature of molten steel is raised to 1603°C;

[0060] ③Crush the rare earth magnesium alloy and nitrogen-containing ferrochrome into small pieces with a particle size of 6-10mm, dry them at 150-180°C, place them at the bottom of the ladle, and perform compound modification treatment on the molten steel by pouring into the ladle;

[0061] ④ Pouring molten steel into refractory product molds, the pouring temperature of molten steel is 1495°C;

[0062] ⑤ A...

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PUM

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Abstract

The invention relates to boracic cast die steel and a preparation method thereof, which belongs to the die technical field. The boracic cast die steel comprises the following chemical compositions in percentage by weight (wt percent): 0.85 to 1.00 percent of C, 6.0 to 8.0 percent of Cr, 0.6 to 1.0 percent of Si, 0.8 to 1.5 percent of Mn, 2.2 to 2.8 percent of B, 0.25 to 0.5 percent of Al, 1.2 to 1.5 percent of Ti, 0.08 to 0.15 percent of N, 0.05 to 0.08 percent of Mg, 0.08 to 0.12 percent of RE, less than 0.04 percent of S, less than 0.04 percent of P, the balance being Fe. In the invention, molten steel is melted and poured and cast to a die, then kept between 950 DEG C and 1000 DEG C for 2h to 5h and treated by oil quenching and drawing temper between 180 DEG C and 250 DEG C for 6h to 8h, thereby making the boracic cast die steel. Compared with the prior art, the boracic cast die steel has the advantages of high intensity and rigidity, good toughness and wear resistance, low cost, etc.

Description

technical field [0001] The invention belongs to the technical field of molds, in particular to boron-containing casting mold steel and a preparation method thereof. Background technique [0002] Mold is an essential tool in the production process of refractory products, and it works on friction brick presses or hydraulic presses ranging from tens to thousands of tons. During the working process, the mold is subjected to the abrasive wear of the hard particles of the refractory material, resulting in a decrease in service life, an increase in production cost, a decrease in production efficiency, and a serious impact on product quality. In recent years, with the development of large-scale and high-density refractory products, high-pressure molding equipment has appeared, which puts forward stricter requirements for molds. Therefore, it is an urgent task for mold workers to choose suitable materials and use advanced production technology to manufacture high-quality molds. For...

Claims

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Application Information

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IPC IPC(8): C22C38/32C22C33/04C21C7/04C21D1/18
CPCY02P10/20
Inventor 符寒光邢建东雷永平宋绪丁成小乐
Owner BEIJING UNIV OF TECH
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