CN1169986C - Al-Si-Mn alloy and its preparing process - Google Patents

Abstract

The present invention relates to Al-Si-Mn alloy for steel making and a preparing method thereof. The Al-Si-Mn alloy for steel making is composed of components of the percentages by weight: 19 to 21 of Al, 16 to 20 of Si, 48 to 52 of Mn, at most 1.8 of C, at most 0.25 of P, at most 0.04 of S and Fe as the rest. The preparing method is orderly carried out according to the following procedures of heating, remelting, slagging, decarbonization, Al and Si addition, fast ingot casting, demoulding and air cooling. The trial measurement of Shanghai Baogang shows that the melting time of each furnace is shortened by 10 to 15 minutes, the direct manufacture cost of each ton is cut by 1.5 yuan, and Al consumption can be reduced by 15% to 20% by using the Al-Si-Mn alloy. The present invention saves a large number of Al resources, and has significant social benefits.

Description

Al-Si-Mn alloy and preparation method thereof

Affiliated technical field

The present invention relates to a kind of reductor of making steel usefulness and additive and preparation method thereof, especially Al-Si-Mn alloy and preparation method thereof.

Background technology

At present, contain the manganese alloy steel series product, especially the demand of pipe line steel increases day by day, and the deoxidation of pipeline steel smelting and alloy add, and is the important process link that preparation is suitable for qualified steel.The tradition steel making deoxidant generally uses single silicon, manganese or fine aluminium deoxidation, and these single elements are made the weak effect of reductor, and it is many to smelt the nonmetallic inclusionsin steel that comes out, and steel is bad.Composite deoxidant as one of metallurgical material is compared with single element, and deoxidation effect is preferably arranged, and this fact is generally acknowledged by the steel-making circle already.Wherein not only deoxidation effect is good for Al-Si-Mn alloy, and can save bauxite resource, improves the quality of steel.But can not produce the Ulmal of this composition in the hot stove in ore deposit, even low manganese height of the aluminium of producing or the low high silicomanganese of aluminium of manganese, cost is also quite high, and simultaneously, this alloy also exists defectives such as easy efflorescence, difficult storage.

Summary of the invention

In order to overcome the deficiency of existing reductor, the invention provides a kind of Al-Si-Mn alloy and preparation method thereof, this alloy not only deoxidation effect is good, but also can efflorescence, easily storage.

The technical solution adopted for the present invention to solve the technical problems is: a kind of Al-Si-Mn alloy, mainly form by aluminium, silicon, manganese, also contain carbon, phosphorus, sulphur and other unavoidable impurities, its weight percent is formed: aluminium 19-21, silicon 16-20, manganese 48-52, carbon≤1.8, phosphorus≤0.25, sulphur≤0.04, iron surplus.

Further: the preparation method of described Al-Si-Mn alloy, carry out according to following steps successively:

A, heating remelting are weighed according to the materials proportioning silicomanganese are dropped into medium-frequency induction furnace, are warming up to 1450 ℃～1550 ℃;

B, slag making de-carbon add alterant (NaCl), stir fully, make and float to the solution upper strata on the carbide, manually drag for slag again;

C, add aluminium and add silicon, add Pure Silicon Metal, aluminium ingot, stir, and be warming up to 1200 ℃～1280 ℃;

D, quick ingot casting are cast into swage fast;

E, demoulding air cooling, demoulding air cooling when being quickly cooled to ingot casting and being orange.

Again further: during described ingot casting with the metal die of 10 centimetres of wall thickness.

Al-Si-Mn alloy of the present invention has the following advantages: 1, than great, be every cubic centimetre of 4.8～5.2 gram, thereby can penetrate the slag liquid level, go deep into having made full use of valuable element in the molten steel; 2, impurity is low, and silicomanganese is after decarburization, and impurity such as institute's carbon containing phosphorus sulphur all decrease, and have reduced the secondary pollution of molten steel; 3, improve the steel grade internal soundness, deoxidation in the past, alloying are carried out at twice, the deoxidation products aluminium sesquioxide is distributed in the molten steel with the disperse shape, finish and Al-Si-Mn alloy can make deoxidation, alloying is disposable, its deoxidation products aluminium sesquioxide, silicon-dioxide can form oarse-grained pure aluminium silicate composite oxides effectively, be easy to come-up and enter slag blanket, eliminated aluminium sesquioxide in the past and be present in shortcoming in the steel ingot, played the effect of optimizing the steel grade internal soundness with disperse shape form; 4, shortened process can make shorten 10～15 minutes the tap to tap time of every stove steel; 5, reduce steel-making cost; 6, obvious social benefit uses Al-Si-Mn alloy can reduce by 15～20% consumption aluminium amount, has saved a large amount of bauxite resources.

Embodiment

The preparation method embodiment of Al-Si-Mn alloy is an example with the 500KG intermediate frequency furnace, and total charging capacity is 470KG, carries out according to following steps successively:

A, heating remelting are 17% with silicon content, and manganese content is that 67% silicomanganese (production of Kunming Alloy Plant) 346KG drops into medium-frequency induction furnace, is warming up to 1500 ℃;

B, slag making de-carbon add alterant (NaCl), stir fully, make and float to the solution upper strata on the carbide, manually drag for slag again;

C, add aluminium and add silicon, add aluminum content and be 99.99% metallic aluminium 95KG, add silicon content and be 99% Pure Silicon Metal 29KG, stir, and be warming up to 1240 ℃;

D, quick ingot casting are cast into the swage of 10 centimetres of wall thickness fast;

E, demoulding air cooling, demoulding air cooling when being quickly cooled to ingot casting and being orange.

By above-mentioned steps, can prepare Al-Si-Mn alloy 445KG, its recovery rate 94.6%.Aluminum content 20.3% in the alloy, silicon content 17.5%, manganese content 50.2%.

Al-Si-Mn alloy of the present invention is measured through the Shanghai Baosteel is on probation, and every stove has shortened 10～15 minutes tap to tap time, has reduced direct production cost, uses Al-Si-Mn alloy can reduce by 15～20% consumption aluminium amount, has saved a large amount of bauxite resources.

Claims (3)

1, a kind of Al-Si-Mn alloy mainly is made up of aluminium, silicon, manganese, also contains carbon, phosphorus, sulphur and other unavoidable impurities, it is characterized in that its weight percent composition is: aluminium 19-21, silicon 16-20, manganese 48-52, carbon≤0.25, phosphorus≤0.25, sulphur≤0.04, iron surplus.

2, must ask the preparation method of 1 described Al-Si-Mn alloy according to power, it is characterized in that, carry out according to following steps successively:

A, heating remelting are weighed according to the materials proportioning silicomanganese are dropped into medium-frequency induction furnace, are warming up to 1450 ℃～1550 ℃;

B, slag making de-carbon add alterant NaCl, stir fully, make and float to the solution upper strata on the carbide, manually drag for slag again;

C, add aluminium and add silicon, add Pure Silicon Metal, aluminium ingot, stir, and be warming up to 1200 ℃～1280 ℃;

D, quick ingot casting are cast into swage fast;

E, demoulding air cooling, demoulding air cooling when being quickly cooled to ingot casting and being orange.

3, the preparation method of Al-Si-Mn alloy according to claim 2 is characterized in that: during described ingot casting with the metal die of 10 centimetres of wall thickness.