As-cast state high-carbon high-chromium cast iron and method for producing the same

A high-carbon, high-chromium, cast iron technology, applied in casting equipment, control of molten metal pouring from ladles, manufacturing tools, etc., can solve the problem of poor uniformity of carbide morphology and distribution, large fluctuations in casting performance, and uniform distribution Poor performance and other problems, to achieve the effect of short production cycle, high hardness and high production efficiency

Inactive Publication Date: 2008-05-07
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, an intermediate alloy containing TiN, NbN and other particles is pre-inoculated in the ladle as a matrix to promote the nucleation of primary carbides. TiN and NbN are easy to agglomerate in molten iron, resulting in poor distribution uniformity and making the carbide morphology in the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Melting high-carbon high-chromium cast iron with a 500 kg medium-frequency induction furnace, the manufacturing process steps are:

[0034] ①Heating and melting ordinary steel scrap, pig iron and carbon ferrochrome, after the molten steel is melted, adding ferromanganese for deoxidation and alloying, and then adding part of ferro-vanadium, the amount of ferro-vanadium added accounts for 76% of the total amount of ferro-vanadium added;

[0035] ② After adjusting the composition before the furnace, the temperature is raised to 1467°C, and then it is taken out of the furnace, and ferroniobium and ferro-titanium are added to the furnace before the furnace is released;

[0036] ③ When the molten iron comes out of the furnace, 24% of the total amount of ferrovanadium added is broken into small pieces with a particle size of less than 15mm, and washed into the ladle with the molten iron;

[0037] ④Crush the rare earth magnesium alloy and sodium salt into small pieces with a pa...

Embodiment 2

[0046] Using a 750 kg medium frequency induction furnace to smelt high carbon high chromium cast iron, the manufacturing process steps are:

[0047] ①Heating and melting ordinary steel scrap, pig iron and carbon ferrochrome, after molten steel is melted, adding ferromanganese for deoxidation and alloying, and then adding part of ferro-vanadium, the amount of ferro-vanadium added accounts for 73% of the total amount of ferro-vanadium added;

[0048] ②After adjusting the ingredients before the furnace, raise the temperature to 1472°C, and then take it out of the furnace, and add ferro-niobium and ferro-titanium into the furnace before it is out of the furnace;

[0049] ③ When the molten iron comes out of the furnace, 27% of the total amount of ferrovanadium added is broken into small pieces with a particle size of less than 15mm, and washed into the ladle along with the molten iron;

[0050] ④Crush the rare earth magnesium alloy and sodium salt into small pieces with a particle ...

Embodiment 3

[0059] Melting high-carbon high-chromium cast iron with a 1000 kg intermediate frequency induction furnace, the manufacturing process steps are:

[0060] ①Heating and melting ordinary steel scrap, pig iron and carbon ferrochrome, after molten steel is melted, adding ferromanganese for deoxidation and alloying, and then adding part of ferro-vanadium, the amount of ferro-vanadium added accounts for 79% of the total amount of ferro-vanadium added;

[0061] ② After adjusting the composition before the furnace, the temperature is raised to 1479°C, and then it is taken out of the furnace, and ferroniobium and ferro-titanium are added to the furnace before the furnace is released;

[0062] ③ When the molten iron comes out of the furnace, 21% of the total amount of ferrovanadium added is broken into small pieces with a particle size of less than 15mm, and washed into the ladle along with the molten iron;

[0063] ④Crush the rare earth magnesium alloy and sodium salt into small pieces ...

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PUM

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Abstract

The invention relates to an as-cast cast iron with high carbon and high chromium and a preparation method, which belongs to the technical field of metal wear-resistant material. The invention is characterized in that the composing components of the cast iron with high carbon and high chromium are (in weight percentage): 4.5 to 5.5 C, 22.5 to 30.8 Cr, 3.0 to 5.0 V, 0.7 to 1.2 Mn, 0.2 to 0.5 Nb, 0.5 to 1.0 Ti, 0.08 to 0.20 Mg, 0.05 to 0.20 Na, 0.05 to 0.20 RE, Si of less than 1.0 and Fe as well as unavoidable trace impurities for the rest, and Cr-to-C ratio is no less than 5.0 and no more than 5.6; the as-cast cast iron with high carbon and high chromium of the invention can be produced in an electric stove with the tapping temperature of 1440 to 1480 DEG C, and is inoculated with ferrovanadium particles after tapping; combined modification treatment is done with rare earth magnesium alloy and sodium salt; the casting temperature of hot metal is 1350 to 1380 DEG C; and the cast iron with high carbon and high chromium can be directly used after stress relief annealing treatment at the temperature of 200 to 280 DEG C. The invention has the advantages of no need of high-temperature heat treatment, low energy cost, short production period, good casting performance, high hardness and excellent abradability.

Description

technical field [0001] The invention relates to cast high-carbon high-chromium cast iron and a preparation method thereof, in particular to cast high-carbon high-chromium cast iron with high carbon content and a preparation method thereof, belonging to the technical field of metal wear-resistant materials. Background technique [0002] In the microstructure of high chromium white cast iron, there are M with high hardness and isolated distribution 7 C 3 Compared with other ordinary white cast irons, it has higher hardness and toughness, which makes it widely used in metallurgy, machinery, mining, building materials, electric power and chemical industries that consume a lot of wear-resistant materials. However, most of the hypoeutectic high-chromium cast irons currently used in industry are hypoeutectic high-chromium cast irons, while hypereutectic high-chromium cast irons with higher carbon content are less used. This is mainly due to the fact that when the carbon content ex...

Claims

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Application Information

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IPC IPC(8): C22C37/06C22C33/10B22D37/00C21D5/00
Inventor 符寒光雷永平邢建东智小慧吴晓俊
Owner BEIJING UNIV OF TECH
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