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Hypereutectic high-chromium cast iron and suspension and modification composite treatment method thereof

A technology of high chromium cast iron and compound treatment, applied in the field of wear-resistant cast iron materials, can solve the problems of high production cost, poor performance, poor toughness, etc., and achieve the effects of improving performance, improving temperature distribution, and increasing nucleation rate

Pending Publication Date: 2022-06-24
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the various high-chromium wear-resistant cast irons that have been successfully developed at present generally have the disadvantages of high brittleness, poor toughness, poor performance, and high production costs.

Method used

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  • Hypereutectic high-chromium cast iron and suspension and modification composite treatment method thereof
  • Hypereutectic high-chromium cast iron and suspension and modification composite treatment method thereof
  • Hypereutectic high-chromium cast iron and suspension and modification composite treatment method thereof

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Experimental program
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Effect test

Embodiment 1

[0062] The specific process of this embodiment is:

[0063] Add ordinary scrap, ferrochromium, ferrosilicon, and ferromanganese into the electric furnace to mix and heat for melting. The chemical composition of cast iron and its mass fraction are 3.98% C, 20.11% Cr, 0.65% Mn, 1.07% Si, S 0.03%, 0.05% of P, balance Fe. Heat the molten iron to 1590℃, add aluminum as a deoxidizer, pour the molten alloy liquid into the ladle immediately after deoxidation, and use the metamorphic treatment method to refine the primary carbide in the ladle, and the metamorphic agent used for metamorphism is potassium salt KMnO 4 The composition of the product after being uniformly calcined at 600° C. for 10 minutes on an electric heating furnace accounts for 2 wt %. The method of adding the modifier is as follows: first put the modifier into the bottom of the ladle according to the required amount, use the punching method to quickly flush the hypereutectic high-chromium cast iron into the molten i...

Embodiment 2

[0065] The manufacturing process steps of the present embodiment are:

[0066] Add ordinary scrap, ferrochromium, ferrosilicon, and ferromanganese into the electric furnace to mix and heat for melting. The chemical composition and mass fraction of cast iron are controlled to be 3.96% C, 20.21% Cr, 0.58% Mn, 1.07% Si, 0.05% % S, 0.03% P, balance Fe. The molten iron is heated to 1580°C, aluminum is added as a deoxidizer, the molten alloy liquid is poured into the ladle immediately after deoxidation, and the primary carbide is refined by metamorphic treatment in the ladle. The metamorphic agent used for metamorphism is potassium salt KMnO 4 The composition of the product after being uniformly calcined at 600° C. for 10 minutes on an electric heating furnace accounts for 2 wt %. The method of adding the modifier is as follows: first put the modifier in the ladle into the bottom of the ladle according to the required amount, use the punching method to quickly flush the hypereutec...

Embodiment 3

[0068] The hypereutectic high chromium cast iron of the present invention is composed of 4.0% C, 25% Cr, 0.7% Mn, 1.2% Si, 0.05% S, 0.05% P and the balance Fe.

[0069] The suspension and metamorphism composite treatment method of the hypereutectic high chromium cast iron of the present invention comprises the following steps:

[0070] 1) Mixing and melting scrap steel, ferrochromium, ferrosilicon and ferromanganese, then adding a deoxidizer to deoxidize after heating to obtain a hypereutectic high-chromium cast iron liquid;

[0071] 2) Pour the hypereutectic high-chromium cast iron liquid into the ladle, and at the same time, use the metamorphic treatment method in the ladle to refine the primary carbides;

[0072] 3) Sprinkle a slag remover on the top of the hypereutectic high-chromium cast iron liquid, and pour it after the temperature of the hyper-eutectic high-chromium cast iron liquid has dropped to 1390 °C. During the pouring process, add a suspending agent while pourin...

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Abstract

The invention discloses hypereutectic high-chromium cast iron and a suspension and modification composite treatment method thereof. The hypereutectic high-chromium cast iron is prepared from, by mass, 3.5%-4.0% of C, 18%-25% of Cr, 0.3%-0.7% of Mn, 0.8%-1.2% of Si, 0%-0.05% of S, 0%-0.05% of P and the balance Fe. The treatment process comprises the following steps: 1) mixing, heating and melting waste steel, ferrochrome, ferrosilicon and ferromanganese, and then heating and deoxidizing to obtain hypereutectic high-chromium cast iron liquid; (2) pouring into a casting ladle, and refining primary carbides in the casting ladle by adopting a modification treatment method at the same time; (3) a slag remover is scattered above the hypereutectic high-chromium cast iron liquid, pouring is carried out after the temperature of the hypereutectic high-chromium cast iron liquid is reduced to 1360-1390 DEG C, and a suspending agent is added while pouring is carried out; and (4) after pouring, a pouring gate opening is covered with fireproof asbestos for heat preservation, then cooling is conducted to the room temperature, suspension and modification composite treatment of the hypereutectic high-chromium cast iron is completed, and the performance of the hypereutectic high-chromium cast iron and the suspension and modification composite treatment method of the hypereutectic high-chromium cast iron can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant cast iron materials, and relates to a hypereutectic high-chromium cast iron and a suspension and metamorphic composite treatment method thereof. Background technique [0002] High chromium cast iron is an iron-based alloy containing 11-35 wt% Cr and 1.8-4.5 wt% C as well as Mo, Mn, Cu, Si and some other alloying elements. It has long been considered as the third-generation wear-resistant material after ordinary white cast iron and nickel hard white cast iron, and has good wear and corrosion resistance. In recent years, it has been widely and well used in metallurgy, mining, mechanical engineering, power technology, transportation and other fields. Especially for wear-resistant parts used in harsh working conditions, such as slurry pump flow parts, ball mill linings, fan blades, vertical grinding rollers, grinding discs and other components, the use of high-chromium cast iron is very good. ...

Claims

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Application Information

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IPC IPC(8): C22C37/06C22C37/10B22D1/00C22C33/08
CPCC22C37/06C22C37/10C22C33/08B22D1/00
Inventor 吴晓俊侯召堂蔡晖王彩侠张芮
Owner XIAN THERMAL POWER RES INST CO LTD