CN103572121A - Production process for aluminum alloy slab ingot - Google Patents

Abstract

The invention belongs to the technical field of metal material manufacture and in particular relates to a production process for aluminum alloy slab ingot. The process comprises the following steps: preparing materials, smelting, adding alloy elements, stirring, carrying out transferring and pouring, and carrying out furnace refining. The process is simple in steps, energy-saving, environment-friendly, low in production cost and high in product qualification rate, and can be applied to production of manganese series aluminum alloy slab ingot.

Description

Aluminium alloy flat bloom production technique

Technical field

The invention belongs to technical field of metal material manufacture, be specifically related to a kind of production technique of aluminium alloy flat bloom.

Background technology

The technique imperfection of current domestic production manganese series alloys slab ingot, yield rate is very low, and its waste product main manifestations is crackle, oxide inclusion, flexural deformation, bubble, shrinkage porosite, component segregation, surface segregation knurl, coarse grains etc.

Summary of the invention

The object of the present invention is to provide an aluminium alloy flat bloom production technique, comprise following steps:

(1) batching, by the various raw material accurate measurements that are up to the standards, meets primary aluminum liquid tonnage that composition requires and the consumption of the various alloying elements of accurate calculation according to the reasonably combined use that requires of aluminium alloy flat bloom chemical composition,

The ceiling value of the Mg content that Mg stipulates by respective alloy,

Si calculates the weight of silicon by the intermediate value of respective alloy regulation,

Cu, Mn, Cr, Zn etc. during as alloying element, calculate by intermediate value;

(2) melting, enters by two-maing ladle electrolysis primary aluminum liquid the forehearth of smelting furnace, then enters smelting furnace by forehearth metaideophone by siphon pipe, smelting temperature is 730-750 ℃;

(3) add alloying element, order of addition is the alloy from high-meltiing alloy to low melting point, at 735 ℃-755 ℃, first Si, Mn, Cu etc. is added to melt, fully stir, then add magnesium ingot, until magnesium melts completely, fully stir, the alloying element fusing time of interpolation is 30 minutes again;

(4) stir, when temperature of aluminum liquid is controlled at 730-750 ℃ in smelting furnace, close fire door, start magnetic stirrer and carry out the stirring of aluminium liquid, and logical nitrogen refining 20 minutes;

(5) metaideophone, aluminium liquid quick and stable is injected to holding furnace, the processing of before metaideophone, chute being correlated with, to chute, whitewash coating, and chute is carried out to preheating, be not less than 30 minutes warm up time, guarantee refractory lining complete drying before use, remove all residues and metal in converter chute and cast gate before converter, check whether converter chute liner and coating have crack, wearing and tearing, whether seam crossing seals etc.;

(6) furnace refining, when in holding furnace, temperature of aluminum liquid reaches 730-740 ℃, start furnace gas rectification systems, chlorine, argon gas and nitrogen mixture body are distributed to cabinet by gas mixing cabinet, gas, be assigned to gas permeable brick, from gas permeable brick, enter the refining that aluminium liquid carries out aluminium liquid in stove, refining time is 15 minutes;

(7) casting, before casting, add Al-5Ti-B silk crystal grain thinning, open holding furnace boiling water mouth, emit aluminium liquid, after filter cloth, import in each crystallizer, when aluminium liquid reaches hot top 80%, open into casting dish water valve, close water drain valve, more than hydraulic pressure is adjusted to 0.2Mpa, open casting machine decline simultaneously and start casting.

Aluminium alloy flat bloom production technique yield rate provided by the invention is high.

Embodiment

(1) batching, by the various raw material accurate measurements that are up to the standards, meets primary aluminum liquid tonnage that composition requires and the consumption of the various alloying elements of accurate calculation according to the reasonably combined use that requires of aluminium alloy flat bloom chemical composition,

The ceiling value of the Mg content that Mg stipulates by respective alloy,

Si calculates the weight of silicon by the intermediate value of respective alloy regulation,

Cu, Mn, Cr, Zn etc. during as alloying element, calculate by intermediate value;

(2) melting, enters by two-maing ladle electrolysis primary aluminum liquid the forehearth of smelting furnace, then enters smelting furnace by forehearth metaideophone by siphon pipe, smelting temperature is 730-750 ℃;

(3) add alloying element, order of addition is the alloy from high-meltiing alloy to low melting point, at 735 ℃-755 ℃, first Si, Mn, Cu etc. is added to melt, fully stir, then add magnesium ingot, until magnesium melts completely, fully stir, the alloying element fusing time of interpolation is 30 minutes again;

(4) stir, when temperature of aluminum liquid is controlled at 730-750 ℃ in smelting furnace, close fire door, start magnetic stirrer and carry out the stirring of aluminium liquid, and logical nitrogen refining 20 minutes;

(5) metaideophone, aluminium liquid quick and stable is injected to holding furnace, the processing of before metaideophone, chute being correlated with, to chute, whitewash coating, and chute is carried out to preheating, be not less than 30 minutes warm up time, guarantee refractory lining complete drying before use, remove all residues and metal in converter chute and cast gate before converter, check whether converter chute liner and coating have crack, wearing and tearing, whether seam crossing seals etc.;

(6) furnace refining, when in holding furnace, temperature of aluminum liquid reaches 730-740 ℃, start furnace gas rectification systems, chlorine, argon gas and nitrogen mixture body are distributed to cabinet by gas mixing cabinet, gas, be assigned to gas permeable brick, from gas permeable brick, enter the refining that aluminium liquid carries out aluminium liquid in stove, refining time is 15 minutes;

(7) casting, before casting, add Al-5Ti-B silk crystal grain thinning, open holding furnace boiling water mouth, emit aluminium liquid, after filter cloth, import in each crystallizer, when aluminium liquid reaches hot top 80%, open into casting dish water valve, close water drain valve, more than hydraulic pressure is adjusted to 0.2Mpa, open casting machine decline simultaneously and start casting.

Aluminium alloy flat bloom qualification rate by this explained hereafter has reached 90% by original 50%.

Claims (1)

1. aluminium alloy flat bloom production technique, is characterized in that, comprises following steps:

(1) batching, by the various raw material accurate measurements that are up to the standards, meets primary aluminum liquid tonnage that composition requires and the consumption of the various alloying elements of accurate calculation according to the reasonably combined use that requires of aluminium alloy flat bloom chemical composition,

The ceiling value of the Mg content that Mg stipulates by respective alloy,

Si calculates the weight of silicon by the intermediate value of respective alloy regulation,

Cu, Mn, Cr, Zn etc. during as alloying element, calculate by intermediate value;

(2) melting, enters by two-maing ladle electrolysis primary aluminum liquid the forehearth of smelting furnace, then enters smelting furnace by forehearth metaideophone by siphon pipe, smelting temperature is 730-750 ℃;

(3) add alloying element, order of addition is the alloy from high-meltiing alloy to low melting point, at 735 ℃-755 ℃, first Si, Mn, Cu etc. is added to melt, fully stir, then add magnesium ingot, until magnesium melts completely, fully stir, the alloying element fusing time of interpolation is 30 minutes again;

(4) stir, when temperature of aluminum liquid is controlled at 730-750 ℃ in smelting furnace, close fire door, start magnetic stirrer and carry out the stirring of aluminium liquid, and logical nitrogen refining 20 minutes;

(5) metaideophone, aluminium liquid quick and stable is injected to holding furnace, the processing of before metaideophone, chute being correlated with, to chute, whitewash coating, and chute is carried out to preheating, be not less than 30 minutes warm up time, guarantee refractory lining complete drying before use, remove all residues and metal in converter chute and cast gate before converter, check whether converter chute liner and coating have crack, wearing and tearing, whether seam crossing seals etc.;

(6) furnace refining, when in holding furnace, temperature of aluminum liquid reaches 730-740 ℃, start furnace gas rectification systems, chlorine, argon gas and nitrogen mixture body are distributed to cabinet by gas mixing cabinet, gas, be assigned to gas permeable brick, from gas permeable brick, enter the refining that aluminium liquid carries out aluminium liquid in stove, refining time is 15 minutes;

(7) casting, before casting, add Al-5Ti-B silk crystal grain thinning, open holding furnace boiling water mouth, emit aluminium liquid, after filter cloth, import in each crystallizer, when aluminium liquid reaches hot top 80%, open into casting dish water valve, close water drain valve, more than hydraulic pressure is adjusted to 0.2Mpa, open casting machine decline simultaneously and start casting.