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Method for grain refining of steel, grain refining alloy for steel and method for producing grain refining alloy

A technology of grain refinement and alloying, which is applied in the direction of vehicle gearboxes, transportation and packaging, chain/belt transmissions, etc., can solve the problems of adverse effects, large inclusions and mechanical properties, etc., and achieve small dendrite arm intervals Effect

Inactive Publication Date: 2003-02-12
ELKEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inclusions generally coarsen over time after adding Ce, unless the melt can be cooled rapidly, after which the inclusions will become larger and generally have a negative impact on mechanical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0051] Manufacturing of grain refinement alloy

[0052] According to the method of the present invention, two different grain refinement alloys are produced.

[0053] Grain refiner 1

[0054] The first grain refining alloy called Grain Refiner 1 is produced according to the following steps:

[0055] A MgO crucible is used to smelt a Fe-Cr-based alloy containing 65% by weight of Cr, 0.05% by weight of C, 0.5% by weight of Si and 0.01% by weight of S in an induction furnace. The melt is overheated to approximately 1700 degrees Celsius, which is approximately 50 degrees Celsius higher than the liquidus temperature of the alloy. Then the silicon-rich and cerium-rich sources are continuously added to the melt in the form of particles to obtain a new liquid Fe-Cr-Si-Ce alloy. The alloy is then cooled in a graphite mold, crushed, and sieved to form particles with a size of 0.5 mm to 4 mm. The screened materials were analyzed and the following results were obtained: 31.9% by weight of Cr,...

example 2

[0060] Grain refinement of steel

[0061] The steel used for grain refinement in Example 2 basically conforms to the two-phase (austenite-ferrite) variant A1S1 329 (or D1N 1.4460), and has the following chemical composition; the weight percentage is 25-28 % Cr, 4.5-6.5% Ni, 1.3-2.0% Mo, 2.0% Mn, 1.0% Si, 0.03% S , The maximum weight percentage of P is 0.04% and the maximum weight percentage of C is 0.1%. Use suitable waste materials for induction smelting to prepare a batch of approximately 800 kilograms of charge, which is then alloyed with chromium, nickel and molybdenum to obtain the final chemical composition. The temperature of liquid steel is between 1580 and 1590 degrees Celsius.

[0062] Reference cast steel (existing technology)

[0063] The reference cast steel was produced by injecting approximately 100 kg of liquid steel from an induction furnace into a separate iron storage tank. During this operation, 0.5 kg of FeSi was added to molten steel for deoxidation. After a ...

example 3

[0067] Grain refinement of steel ingots used for forging operations

[0068] The steel used in these grain refinement tests basically conforms to the fully austenitic stainless steel variant 254 SMO (or D1N 1.4547), and has the following chemical composition; the weight percentage is 19.5%-20.5% Cr, and the weight percentage is 17.5%-18.5% Ni, 6.0%-7.0% Mo by weight, Mn with a maximum weight percentage of 1.0%, Si with a maximum weight percentage of 0.7%, S with a maximum weight percentage of 0.010%, and a maximum weight percentage 0.030% of P and a maximum of 0.02% of C by weight. Two different furnaces, each containing approximately 5 tons of liquid steel, which was prepared in an AOD converter using suitable charge materials. After being transferred to the ladle, the temperature of the molten steel was about 1590 degrees Celsius.

[0069] Reference steel ingot (existing technology)

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Abstract

The present invention relates to a method for grain refining of steel. A grain refining alloy having a composition FeXY where X is one or more elements selected from the group consisting of Cr, Mn, Si, Ni, and Mo and where Y is one or more oxide and / or sulphide and / or nitride and / or carbide forming elements selected from the group consisting of Ce, La, Nd, Pr, Ti, Al, Zr, Ca, Ba, Sr, Mg, C and N where X is between 0.001 and 99 % by weight based on the weight of the alloy and where Y is between 0.001 and 50 % by weight of the alloy, said alloy additionally containing between 0.001 and 2 % by weight of oxygen and / or between 0.001 and 2 % by weight of sulphur, said alloy containing at least 10<3> inclusion particles per mm<3> consisting of oxides and / or sulphides and / or carbides and / or nitrides of one or more of the Y elements and / or one or more of the X elements Cr, Mn and Si in addition to Fe, said inclusion particles having a mean diameter of less than 10 mu m, is added to molten steel in an amount of between 0.01 and 5 % by weight based on the weight of the steel, whereafter the steel is cast. The invention further relates to a grain refining alloy for steel and to a method for producing grain refining alloys.

Description

Technical field [0001] The invention relates to a method for grain refining of steel, particularly ferritic steel and austenitic steel, a grain refining alloy for steel and a method for producing grain refining alloy. The alloy is designed to control the grain size of shaped castings and blanks that need to be further processed into standard profiles (ie, sheets, plates, tubes, bars, wires, or rods). Background technique [0002] The demand for high-performance steel with optimized comprehensive performance is increasing. Since the grain size in steel controls the properties obtained, the required properties can be obtained by appropriately improving its microstructure. [0003] Cast steel is the best example of a material whose performance depends on the characteristics of the solidified microstructure. In a nutshell, if there is a lack of effective heterogeneous nucleation sites before the solidification front, then a coarse columnar grain structure must be formed during solidi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/20B22D11/04B62M9/06B62M9/08C21C7/00C22C14/00C22C19/03C22C21/00C22C22/00C22C23/00C22C24/00C22C27/00C22C27/04C22C27/06C22C28/00C22C30/00C22C38/00C22C38/02C22C38/18C22C38/44
CPCC22C30/00C22C38/02C22C38/005C22C27/00B22D11/0405C22C38/44C22C38/18C21C7/0006B62M9/06B62M9/08C22C38/00
Inventor O·格隆O·S·克莱文
Owner ELKEM
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