CN105714018A - LF furnace steel-making process - Google Patents

Abstract

The invention discloses an LF furnace steel-making process. The LF furnace steel-making process comprises the following steps: temperature measurement, wherein temperature measurement is carried out after arrival of molten steel, heating time is no more than 5 min and temperature measurement has to be carried out as slag shells exist, and in an argon stirring zone at a temperature measurement point, insertion time is 5 to 7 s, insertion depth is 300 to 400 m, the flow of temperature-measuring argon is 200 NL/min and the flow of stirring argon is 400 to 500 NL/min after stirring for 1 min after cut-off of electricity; power supply and heating, wherein low-grade voltage and current are used after striking of arc, the grade of voltage can only be increased after arc and electrodes are stable, the flow of argon used in striking of arc is 100 to 200 NL/min, and the flow of argon used in heating is 200 to 300 NL/min; slagging, wherein 600 kg of lime and 100 kg of a modifier are used, the lime is added in two batches so as to prevent aggregation of the lime, electricity is cut off after heating for 6 min, then the flow of argon is adjusted to 500 to 600 NL/min, then violent stirring is carried out for 1 min and slag dipping is carried out; and wire feeding, wherein a wire feeding pipe is 500 mm away from a slag surface, wires are ensured to enter molten steel in a vertical way, slag conditions must be confirmed before wire feeding, wire feeding below yellow and white slag should be guaranteed, a wire feeding speed is 240 to 260 m/min, the argon stirring flow during aluminum wire feeding is 200 to 300 NL/min, and the argon stirring flow during silico-calcium wire or calcium-iron wire feeding is 200 to 300 NL/min.

Description

A kind of LF stove process for making

Technical field

The present invention relates to a kind of LF stove process for making.

Background technology

Existing LF stove process for making exists that procedure arrangement is unreasonable, operation is various, and technological parameter selects unreasonable, and the collocation of each technological parameter is unreasonable and operator's skill requirement is higher so that production cost is higher, product quality is on the low side, yield rate is not high.

Summary of the invention

Because the drawbacks described above of prior art, the technical problem to be solved be to provide a kind of operation rationally, the LF stove process for making of low cost of manufacture.

For achieving the above object, the invention provides

A kind of LF stove process for making, comprises the steps:

1) preparation before, producing: understanding working of succeeding produces and machine operation, handing over to the next shift stove number, steel grade, ladle number and bag condition, ladle position, just in the charging quantity of this stove molten steel of refine and kind, sampling situation, understands composition and the manufacturer of various alloy materials to raw material；

2), bull ladle work seat wrap well, connect the operative employee notifying operating room after tunger tube: ladle from which hang and ladle number, open argon and blow skull open；(blow open skull use argon flow amount 800NL/min) platform operations work observe bag along dry slag, ladle argon-blown situation, slag situation confirm eligible after can refine；Immediately argon flow amount is adjusted to after blowing skull open 100NL/min, waits refine；

3), thermometric: thermometric after entering the station, must not exceed 5 minutes heat time heating time if any skull, it is necessary to thermometric, point for measuring temperature argon stirring area, inserts second time 5-7, insertion depth 300-400mm, thermometric argon flow amount 200NL/min, has a power failure after stirring 1min, stirs argon flow amount 400-500NL/min；

4), power transmission heating: the starting the arc uses deep low gear step voltage, electric current, after electric arc, electrode are stable, can heighten voltage gear level, and the starting the arc uses argon flow amount 100-200NL/min, and heating uses argon flow amount 200-300NL/min；

5), slag making: Calx 600kg, modification agent 100kg, Calx adds in two batches, it is to avoid Calx knot stone roller, heating 6min has a power failure, and argon is adjusted to 500-600NL/min, strong mixing 1min, it is stained with slag, observes slag condition thermometric, add appropriate slag charge, modification agent or carbide according to slag condition；Guarantee to have made white slag, rare condense suitable, there is enough dross inclusion adsorption abilities；

6), sampling, sample presentation: slag is adjusted to HUANGBAI(sic) slag and can sample, (heating stops stirring 3min rear sampling, carburetting, alloy fine setting stirring 4min rear sampling, sample position, argon stirring area, insertion depth 300-400mm, inserts second time 5-7, samples argon flow amount 200-300NL/min), after confirming that sample is qualified, post label, proper use of touch screen, sample is sent to laboratory；

7), alloy fine setting: receive refine sample ingredient to rear tunable alloy, be considered as alloy quantity added by argon station, carburant quantity when blending gold, carburetting；

8), line feeding: line feeding conduit is from top of the slag 500mm, it is ensured that line is vertically into molten steel；Slag condition must be confirmed, it is ensured that line feeding under HUANGBAI(sic) slag before line feeding；Wire-feeding velocity 240-260m/min, feeds aluminum steel argon stirring flow 200-300NL/min, feeds silicon-calcium wire or calcium iron wire argon stirring flow 50-100NL/min；Feeding silicon-calcium wire or calcium iron wire after first feeding aluminum steel, after having fed line, argon flow amount 200NL/min stirs 1min rear sampling；

9), soft stirring: the soft mixing effect top of the slag springs up, not exposed molten steel face；Stirring flow 50-100NL/min, adjusts uninterrupted according to practical situation；Ensure soft mixing time；

10), dedusting: suitably adjust valve openings degree according to refining stage is different, keep Deoxidation Atmosphere in Furnace, it is ensured that do not smolder；

11), upper steel temperature controls: according to drawing steel cycle and ladle situation, it is determined that suitable upper steel temperature, it is ensured that tundish temperature is qualified.

The invention has the beneficial effects as follows: operation of the present invention is reasonable, low cost of manufacture, each parameter collocation reasonable coordination, it is possible to be effectively improved product quality and production efficiency.

Detailed description of the invention

Below in conjunction with embodiment, the invention will be further described:

A kind of LF stove process for making, comprises the steps:

1) preparation before, producing: understanding working of succeeding produces and machine operation, handing over to the next shift stove number, steel grade, ladle number and bag condition, ladle position, just in the charging quantity of this stove molten steel of refine and kind, sampling situation, understands composition and the manufacturer of various alloy materials to raw material；

2), bull ladle work seat wrap well, connect the operative employee notifying operating room after tunger tube: ladle from which hang and ladle number, open argon and blow skull open；(blow open skull use argon flow amount 800NL/min) platform operations work observe bag along dry slag, ladle argon-blown situation, slag situation confirm eligible after can refine；Immediately argon flow amount is adjusted to after blowing skull open 100NL/min, waits refine；

3), thermometric: thermometric after entering the station, must not exceed 5 minutes heat time heating time if any skull, it is necessary to thermometric, point for measuring temperature argon stirring area, inserts second time 5-7, insertion depth 300-400mm, thermometric argon flow amount 200NL/min, has a power failure after stirring 1min, stirs argon flow amount 400-500NL/min；

4), power transmission heating: the starting the arc uses deep low gear step voltage, electric current, after electric arc, electrode are stable, can heighten voltage gear level, and the starting the arc uses argon flow amount 100-200NL/min, and heating uses argon flow amount 200-300NL/min；

5), slag making: Calx 600kg, modification agent 100kg, Calx adds in two batches, it is to avoid Calx knot stone roller, heating 6min has a power failure, and argon is adjusted to 500-600NL/min, strong mixing 1min, it is stained with slag, observes slag condition thermometric, add appropriate slag charge, modification agent or carbide according to slag condition；Guarantee to have made white slag, rare condense suitable, there is enough dross inclusion adsorption abilities；

6), sampling, sample presentation: slag is adjusted to HUANGBAI(sic) slag and can sample, (heating stops stirring 3min rear sampling, carburetting, alloy fine setting stirring 4min rear sampling, sample position, argon stirring area, insertion depth 300-400mm, inserts second time 5-7, samples argon flow amount 200-300NL/min), after confirming that sample is qualified, post label, proper use of touch screen, sample is sent to laboratory；

7), alloy fine setting: receive refine sample ingredient to rear tunable alloy, be considered as alloy quantity added by argon station, carburant quantity when blending gold, carburetting；

8), line feeding: line feeding conduit is from top of the slag 500mm, it is ensured that line is vertically into molten steel；Slag condition must be confirmed, it is ensured that line feeding under HUANGBAI(sic) slag before line feeding；Wire-feeding velocity 240-260m/min, feeds aluminum steel argon stirring flow 200-300NL/min, feeds silicon-calcium wire or calcium iron wire argon stirring flow 50-100NL/min；Feeding silicon-calcium wire or calcium iron wire after first feeding aluminum steel, after having fed line, argon flow amount 200NL/min stirs 1min rear sampling；

9), soft stirring: the soft mixing effect top of the slag springs up, not exposed molten steel face；Stirring flow 50-100NL/min, adjusts uninterrupted according to practical situation；Ensure soft mixing time；

10), dedusting: suitably adjust valve openings degree according to refining stage is different, keep Deoxidation Atmosphere in Furnace, it is ensured that do not smolder；

11), upper steel temperature controls: according to drawing steel cycle and ladle situation, it is determined that suitable upper steel temperature, it is ensured that tundish temperature is qualified.

Claims (1)

1. a LF stove process for making, is characterized in that: comprise the steps:

1) preparation before, producing: understanding working of succeeding produces and machine operation, handing over to the next shift stove number, steel grade, ladle number and bag condition, ladle position, just in the charging quantity of this stove molten steel of refine and kind, sampling situation, understands composition and the manufacturer of various alloy materials to raw material；

2), bull ladle work seat wrap well, connect the operative employee notifying operating room after tunger tube: ladle from which hang and ladle number, open argon and blow skull open；(blow open skull use argon flow amount 800NL/min) platform operations work observe bag along dry slag, ladle argon-blown situation, slag situation confirm eligible after can refine；Immediately argon flow amount is adjusted to after blowing skull open 100NL/min, waits refine；

3), thermometric: thermometric after entering the station, must not exceed 5 minutes heat time heating time if any skull, it is necessary to thermometric, point for measuring temperature argon stirring area, inserts second time 5-7, insertion depth 300-400mm, thermometric argon flow amount 200NL/min, has a power failure after stirring 1min, stirs argon flow amount 400-500NL/min；

4), power transmission heating: the starting the arc uses deep low gear step voltage, electric current, after electric arc, electrode are stable, can heighten voltage gear level, and the starting the arc uses argon flow amount 100-200NL/min, and heating uses argon flow amount 200-300NL/min；

5), slag making: Calx 600kg, modification agent 100kg, Calx adds in two batches, it is to avoid Calx knot stone roller, heating 6min has a power failure, and argon is adjusted to 500-600NL/min, strong mixing 1min, it is stained with slag, observes slag condition thermometric, add appropriate slag charge, modification agent or carbide according to slag condition；Guarantee to have made white slag, rare condense suitable, there is enough dross inclusion adsorption abilities；

6), sampling, sample presentation: slag is adjusted to HUANGBAI(sic) slag and can sample, (heating stops stirring 3min rear sampling, carburetting, alloy fine setting stirring 4min rear sampling, sample position, argon stirring area, insertion depth 300-400mm, inserts second time 5-7, samples argon flow amount 200-300NL/min), after confirming that sample is qualified, post label, proper use of touch screen, sample is sent to laboratory；

7), alloy fine setting: receive refine sample ingredient to rear tunable alloy, be considered as alloy quantity added by argon station, carburant quantity when blending gold, carburetting；

8), line feeding: line feeding conduit is from top of the slag 500mm, it is ensured that line is vertically into molten steel；Slag condition must be confirmed, it is ensured that line feeding under HUANGBAI(sic) slag before line feeding；Wire-feeding velocity 240-260m/min, feeds aluminum steel argon stirring flow 200-300NL/min, feeds silicon-calcium wire or calcium iron wire argon stirring flow 50-100NL/min；Feeding silicon-calcium wire or calcium iron wire after first feeding aluminum steel, after having fed line, argon flow amount 200NL/min stirs 1min rear sampling；

9), soft stirring: the soft mixing effect top of the slag springs up, not exposed molten steel face；Stirring flow 50-100NL/min, adjusts uninterrupted according to practical situation；Ensure soft mixing time；

10), dedusting: suitably adjust valve openings degree according to refining stage is different, keep Deoxidation Atmosphere in Furnace, it is ensured that do not smolder；

11), upper steel temperature controls: according to drawing steel cycle and ladle situation, it is determined that suitable upper steel temperature, it is ensured that tundish temperature is qualified.