CN1207402C

CN1207402C - Steel making MnAlTiFe alloy with microcomponent Si and Low C,P and S contents

Info

Publication number: CN1207402C
Application number: CN 03119587
Authority: CN
Inventors: 李春德; 李毅
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-03-12
Filing date: 2003-03-12
Publication date: 2005-06-22
Anticipated expiration: 2023-03-12
Also published as: CN1441067A

Abstract

The present invention discloses a MnAlTiFe alloy with micro-component Si and low C, P and S contents, which is used for steel-making deoxidization and alloying. The MnAlTiFe alloy comprises the components of 11 wt% to 75 wt% of Mn, 8 wt% to 53 wt% of Al, 0.5 wt% to 18 wt% of Ti and iron and balance of impurities, the impurities comprise 0.1% to 0.4% of C, 0.1% to 0.5% of Si, 0.010% to 0.04% of P and 0.015% to 0.04% of S. The MnAlTiFe alloy is used for the deoxidization and alloying of steel and has strong deoxidization capacity and easy upward-floating performance of formed impurities, and more importantly, the MnAlTiFe alloy can obtain steel with high purity due to the low impurity contents of Si, C, P and the like, enhance the quality and the mechanical property of the steel and be widely used for the deoxidization and alloying of steel containing low Si, C, P and S. With the enhancement of the quality requirement for the steel, the MnAlTiFe alloy has larger and larger demand.

Description

Little silicon low-carbon low-phosphor low-sulfur ferro-aluminium manganese titanium alloy of steel-making usefulness

Technical field: the present invention relates to a kind of iron alloy of making steel usefulness, particularly relate to a kind of little silicon low-carbon low-phosphor low-sulfur ferro-aluminium manganese titanium alloy that makes its deoxidation and alloying in the melting attitude molten steel that is used to add.

Background technology: at present, ferro-aluminium manganese titanium alloy has been used for the deoxidation and the alloying of some steel grade, ferro-aluminium manganese titanium alloy as CN1198474A and CN1198473A bulletin with pseudo rimmed steel deoxidation and alloying, the weight quota of the titanium aluminum-manganese-iron alloy that adopts is respectively: Mn30-40%, Ai 15-28%, Tl 1-4%, Fe 23-43%, all the other are impurity; With Al 5-40%, Mn 20-70%, Ti 1-15%, C＜6%, Si＜6%, surplus is iron and impurity p and s.Only from the disclosed content of its specification sheets, the best share of putting down in writing as the specification sheets of CN1198474A is: Mn 36%, and Al 19%, and Ti 2%, and Fe 38%, and all the other are impurity, comprises C, Si, P, S in the impurity, accounts for 5% of total amount.And the best share of the specification sheets of CN1198473A record is: Al 21.3%, and Mn 48.6%, and Ti 5.8%, and C 1.6%; Si 2.2%, and P 0.03%, and S 0.040%, and surplus is an iron.Obviously, impurity silicon, carbon, phosphorus, sulphur content are all very high in the above-mentioned alloy, along with scientific-technical progress, the development of production requires more and more higher to steel quality, content requirement to impurity in the steel is more and more lower, for many steel grades, especially for the low-phosphorous low-sulfur steel of low-silicon low-carbon, above-mentioned ferro-aluminium manganese titanium alloy can not meet the demands, for this reason, STEELMAKING PRODUCTION person requires iron alloy enterprise to supply with little silicon low-carbon low-phosphor low-sulfur ferro-aluminium manganese titanium alloy.

Summary of the invention: the object of the present invention is to provide a kind ofly to be used for deoxidation in steel making and alloying, and make the low-down ferro-aluminium manganese titanium alloys of foreign matter content such as silicon, carbon, phosphorus, sulphur.

Little silicon low-carbon low-phosphor low-sulfur ferro-aluminium manganese titanium alloy of steel-making usefulness proposed by the invention, this alloy compatibility scope is by weight percentage: Mn 11-75%, Al 8-53%, Ti0.5-18%, surplus is iron and impurity, and the C in this impurity is 0.1-0.4%, and Si is 0.1-0.5%, P is 0.010-0.04%, and S is 0.015-0.04%.

Little silicon low-carbon low-phosphor low-sulfur ferro-aluminium manganese titanium alloy proposed by the invention, has very strong deoxidizing capacity, and the inclusion that forms is easy to come-up, for low alloy steel and micro-alloyed steel, titanium in this alloy still is a steel interalloy element main additive, thereby has improved the toughness and the weldability of steel; The more important thing is that foreign matter contents such as silicon, carbon, phosphorus, sulphur are very low in this alloy, be used for the deoxidation and the alloying of steel, can obtain the very high steel of clarity, improved the quality and the mechanical property of steel.Be widely used in welding steel, steel for automobile crossbeam, deep drawing steel, the deoxidation and the alloying of the low-phosphorous low-sulfur steels of low-silicon low-carbon such as aluminium killed steel.

Production unit of the present invention and technology, the equipment of employing are medium-frequency induction furnace or main frequency furnace, and furnace lining forms with quality magnesia knotting, and the raw material of use has electrolytic metal Mn or low carbon ferromanganese, and high ferrotianium or middle ferrotianium, aluminium ingot, carbon content are less than 0.15% steel scrap.Prepare burden by the requirement of alloy product composition, the furnace charge for preparing in pack into intermediate frequency furnace or the main frequency furnace, send electricity, heating, fusing, treats to come out of the stove when the furnace charge fine melt becomes liquid alloy, is cast into alloy block.

Embodiment:

According to the requirement of product alloying constituent, will meet the electrolytic metal Mn of national standard or international standard, high ferrotianium, aluminium ingot and carbon containing and prepare burden less than 0.15% steel scrap, ratio of components is: electrolytic metal Mn 32%, high ferrotianium 11%, aluminium ingot 23%, all the other are steel scrap.The furnace charge for preparing, in the medium-frequency induction furnace of the magnesia tamped lining of packing into, send electricity, heating, fusing, smelted through more than 50 minutes, the furnace charge fine melt changes into liquid alloy, comes out of the stove, be cast into the 0.3-0.8kg iron alloy block, obtain composition (weight) Mn 32.1%, Al 21.8%, Ti 6.6%, C 0.10%, and Si 0.19%, and P 0.015%, S 0.019%, and surplus is little silicon low-carbon low-phosphor low-sulfur ferro-aluminium manganese titanium alloy of iron.

Claims

1, a kind of little silicon low-carbon low-phosphor low-sulfur ferro-aluminium manganese titanium alloy of making steel usefulness, it is characterized in that: this alloy compatibility scope is by weight percentage: Mn 11-75%, Al 8-53%, Ti0.5-18%, surplus is iron and impurity, and the C in this impurity is 0.1-0.4%, Si0.1-0.5%, P 0.010-0.04%, S are 0.015-0.04%.