CN104017929A - Method for increasing percent of pass of carbon-sulphur ingredient of non-oriented silicon steel - Google Patents
Method for increasing percent of pass of carbon-sulphur ingredient of non-oriented silicon steel Download PDFInfo
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- CN104017929A CN104017929A CN201410258664.8A CN201410258664A CN104017929A CN 104017929 A CN104017929 A CN 104017929A CN 201410258664 A CN201410258664 A CN 201410258664A CN 104017929 A CN104017929 A CN 104017929A
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Abstract
The invention relates to a method for increasing percent of pass of a carbon-sulphur ingredient of non-oriented silicon steel. Processes and working parameters of a desulphurization working procedure, a steelmaking working procedure, an RH refining operation process and an LF furnace refining operation process are strictly controlled, so that the percent of pass of the carbon-sulphur ingredient of molten steel is more than 95%. Compared with the prior art, the method for increasing the percent of pass of the carbon-sulphur ingredient of the non-oriented silicon steel has the beneficial effects that a duplex process is adopted, ingredients of the produced molten steel meet the requirement of the non-oriented silicon steel, and the percent of pass of the carbon-sulphur ingredient of the non-oriented silicon steel is increased.
Description
Technical field
The present invention relates to continuous casting refining treatment technology, relate in particular to a kind of method that improves non orientating silicon steel carbon sulphur composition qualification rate.
Background technology
At present, cold rolling non-orientation silicon steel sheet is the silicon-iron soft magnetic alloy that a kind of massfraction of carbon is extremely low, is development electric power, telecommunication and the essential magneticsubstance of war industry.Cold rolling non-orientation silicon steel is the electrical steel of current production rate maximum.In the cold rolling non-oriented electrical steel of the low trade mark can be used for manufacturing the electrical equipments such as compressor, transformer and current stabilizer in middle-size and small-size industrial motor, household electrical appliance.At present the production line of steel mill's reality mainly produce in the non orientating silicon steel of the low trade mark, adopt duplex technique, the carbon sulphur composition qualification rate of molten steel is lower.Wherein, the lime amount adding in steelmaking process is few, in LF stove refining operation process, has added lime and calcium carbide, and carbon component qualification rate is 86%, and sulphur composition qualification rate is 81%, causes the cost of this production line production non orientating silicon steel higher.
Summary of the invention
The object of the present invention is to provide a kind of method that improves non orientating silicon steel carbon sulphur composition qualification rate, by process and the working parameter of strict control desulfurization process, steel making working procedure, RH refining operation operation and the concise operation sequence of LF stove, the qualification rate of molten steel carbon sulphur composition is reached more than 95%.
For achieving the above object, the present invention realizes by the following technical solutions:
Improve a method for non orientating silicon steel carbon sulphur composition qualification rate, its technical process comprises desulfurization process, steel making working procedure, RH refining operation operation and the concise operation sequence of LF stove, for above, what time is controlled, and concrete steps are as follows:
1) desulfurization process: pre-treatment adopts the dark desulfurization pattern of deeply skimming, de-after sulphur be not more than 0.002%, after processing, molten iron slag scratches clean;
2) steel making working procedure:
A) in tapping temperature, tank, oxygen value and hanging pot temperature are controlled: in rimming steel tapping wt%:C < 0.04, tank oxygen value between 600～900ppm, 1710～1730 ℃ of tapping temperatures, 1655～1675 ℃ of hanging pot temperature;
B) before tapping, block tap hole, special-purpose slag blocking dart is installed, first slag goes out outside tank, controls the lower quantity of slag; In tapping process, by alloy canister, add 10kg/ ton steel lime to carry out modifying process; After tapping finishes, depending on terminal, whether the situation of re-blowing adds different quantities spherical Al slag: one pulls out steel or point while blowing time≤1min, adds the spherical Al slag of 1.7kg/ ton steel; When point blows time > 1.0min, add the spherical Al slag of 2kg/ ton steel;
C) alloying: only add mid-carbon fe-mn in tapping process, adjust manganese composition and limit in specification;
3) RH refining operation:
A) RH adopts depths reason, takes out of carbon and is controlled at below 0.001%;
B) RH carries out the alloying outside silica removal composition, and each elemental composition is all controlled in finished product composition range;
C) take out of temperature and be controlled at 1610～1615 ℃;
4) LF stove refining operation:
A) thermometric sampling after standby position stirs 3 minutes;
B), after entering the station, according to RH, take out of sample silicon, aluminium component are carried out to rough adjustment;
C) according to the low-carbon ferrosilicon amount that enters the station sample and add, silicon composition is carried out to accurate adjustment whole;
D) treating processes must not add lime and calcium carbide;
E) control the LF stove treatment time within 10～13 minutes; Treating processes is controlled argon flow amount, reduces nitrogen pick-up.
Compared with prior art, the invention has the beneficial effects as follows:
By duplex practice, the molten steel composition of producing meets the requirement of non orientating silicon steel, and the qualification rate of molten steel carbon sulphur composition all can reach more than 95%.
Embodiment
Below the specific embodiment of the present invention is further illustrated:
Improve a method for non orientating silicon steel carbon sulphur composition qualification rate, its technical process comprises desulfurization process, steel making working procedure, RH refining operation operation and the concise operation sequence of LF stove, for above, what time is controlled, and concrete steps are as follows:
1) desulfurization process: pre-treatment adopts the dark desulfurization pattern of deeply skimming, de-after sulphur be not more than 0.002%, after processing, molten iron slag must scratch clean, anti-non-return sulphur;
2) steel making working procedure:
A) in tapping temperature, tank, oxygen value and hanging pot temperature are controlled:
| Steel grade | Tapping [C], % | Oxygen value in tank, ppm | Tapping temperature reference value ℃ | Hanging pot temperature ℃ |
| Rimming steel | ＜0.04 | 600～900 | 1710～1730 | 1655～1675 |
Watering time first tank changes the inferior hanging pot temperature of vacuum chamber tank with heat and need improve 10 ℃.
B) before tapping, block tap hole, special-purpose slag blocking dart is installed, first slag goes out outside tank, controls the lower quantity of slag; In tapping process, by alloy canister, add 10kg/ ton steel lime to carry out modifying process; After tapping finishes, depending on terminal, whether the situation of re-blowing adds different quantities spherical Al slag: one pulls out steel or point while blowing time≤1min, adds the spherical Al slag of 1.7kg/ ton steel; When point blows time > 1.0min, add the spherical Al slag of 2kg/ ton steel;
C) alloying: only add mid-carbon fe-mn in tapping process, adjust manganese composition and limit in specification;
3) RH refining operation:
A) RH adopts depths reason, takes out of carbon and is controlled at below 0.001%;
B) RH carries out the alloying outside silica removal composition, and each elemental composition is all controlled in finished product composition range;
C) take out of temperature and be controlled at 1610～1615 ℃;
4) LF stove refining operation:
A) thermometric sampling after standby position stirs 3 minutes;
B), after entering the station, according to RH, take out of sample silicon, aluminium component are carried out to rough adjustment;
C) according to the low-carbon ferrosilicon amount that enters the station sample and add, silicon composition is carried out to accurate adjustment whole;
D) treating processes must not add lime and calcium carbide;
E) control the LF stove treatment time within 10～13 minutes; Treating processes is controlled argon flow amount, reduces nitrogen pick-up.
Embodiment 1:
1) desulfurization process: pre-treatment adopts the dark desulfurization pattern of deeply skimming, de-after sulphur 0.001%, after processing, molten iron slag must scratch clean, anti-non-return sulphur;
2) steel making working procedure:
A) in tapping temperature, tank, oxygen value and hanging pot temperature are controlled:
| Steel grade | Tapping [C], % | Oxygen value in tank, ppm | Tapping temperature reference value ℃ | Hanging pot temperature ℃ |
| Rimming steel | 0.02 | 650 | 1710 | 1655 |
Watering time first tank changes the inferior hanging pot temperature of vacuum chamber tank with heat and need improve 10 ℃.
B) before tapping, block tap hole, special-purpose slag blocking dart is installed, first slag goes out outside tank, controls the lower quantity of slag; In tapping process, by alloy canister, add 10kg/ ton steel lime to carry out modifying process; After tapping finishes, depending on terminal, whether the situation of re-blowing adds different quantities spherical Al slag: one pulls out steel or point while blowing time≤1min, adds the spherical Al slag of 1.7kg/ ton steel; When point blows time > 1.0min, add the spherical Al slag of 2kg/ ton steel;
C) alloying: only add mid-carbon fe-mn in tapping process, adjust manganese composition and limit in specification;
3) RH refining operation:
A) RH adopts depths reason, takes out of carbon and is controlled at 0.0006%;
B) RH carries out the alloying outside silica removal composition, and each elemental composition is all controlled in finished product composition range;
C) take out of temperature and be controlled at 1610～1615 ℃;
4) LF stove refining operation:
A) thermometric sampling after standby position stirs 3 minutes;
B), after entering the station, according to RH, take out of sample silicon, aluminium component are carried out to rough adjustment;
C) according to the low-carbon ferrosilicon amount that enters the station sample and add, silicon composition is carried out to accurate adjustment whole;
D) treating processes must not add lime and calcium carbide;
E) control the LF stove treatment time at 10 minutes; Treating processes is controlled argon flow amount, reduces nitrogen pick-up.
Embodiment 2:
1) desulfurization process: pre-treatment adopts the dark desulfurization pattern of deeply skimming, de-after sulphur be not more than 0.0015%, after processing, molten iron slag must scratch clean, anti-non-return sulphur;
2) steel making working procedure:
A) in tapping temperature, tank, oxygen value and hanging pot temperature are controlled:
| Steel grade | Tapping [C], % | Oxygen value in tank, ppm | Tapping temperature reference value ℃ | Hanging pot temperature ℃ |
| Rimming steel | 0.03 | 700 | 1720 | 1667 |
Watering time first tank changes the inferior hanging pot temperature of vacuum chamber tank with heat and need improve 10 ℃.
B) before tapping, block tap hole, special-purpose slag blocking dart is installed, first slag goes out outside tank, controls the lower quantity of slag; In tapping process, by alloy canister, add 10kg/ ton steel lime to carry out modifying process; After tapping finishes, depending on terminal, whether the situation of re-blowing adds different quantities spherical Al slag: one pulls out steel or point while blowing time≤1min, adds the spherical Al slag of 1.7kg/ ton steel; When point blows time > 1.0min, add the spherical Al slag of 2kg/ ton steel;
C) alloying: only add mid-carbon fe-mn in tapping process, adjust manganese composition and limit in specification;
3) RH refining operation:
A) RH adopts depths reason, takes out of carbon and is controlled at 0.0003%;
B) RH carries out the alloying outside silica removal composition, and each elemental composition is all controlled in finished product composition range;
C) take out of temperature and be controlled at 1611 ℃;
4) LF stove refining operation:
A) thermometric sampling after standby position stirs 3 minutes;
B), after entering the station, according to RH, take out of sample silicon, aluminium component are carried out to rough adjustment;
C) according to the low-carbon ferrosilicon amount that enters the station sample and add, silicon composition is carried out to accurate adjustment whole;
D) treating processes must not add lime and calcium carbide;
E) control the LF stove treatment time at 12 minutes; Treating processes is controlled argon flow amount, reduces nitrogen pick-up.
Embodiment 3:
1) desulfurization process: pre-treatment adopts the dark desulfurization pattern of deeply skimming, de-after sulphur: 0.0015%, after processing, molten iron slag must scratch clean, anti-non-return sulphur;
2) steel making working procedure:
A) in tapping temperature, tank, oxygen value and hanging pot temperature are controlled:
| Steel grade | Tapping [C], % | Oxygen value in tank, ppm | Tapping temperature reference value ℃ | Hanging pot temperature ℃ |
| Rimming steel | 0.03 | 850 | 1730 | 1673 |
Watering time first tank changes the inferior hanging pot temperature of vacuum chamber tank with heat and need improve 10 ℃.
B) before tapping, block tap hole, special-purpose slag blocking dart is installed, first slag goes out outside tank, controls the lower quantity of slag; In tapping process, by alloy canister, add 10kg/ ton steel lime to carry out modifying process; After tapping finishes, depending on terminal, whether the situation of re-blowing adds different quantities spherical Al slag: one pulls out steel or point while blowing time≤1min, adds the spherical Al slag of 1.7kg/ ton steel; When point blows time > 1.0min, add the spherical Al slag of 2kg/ ton steel;
C) alloying: only add mid-carbon fe-mn in tapping process, adjust manganese composition and limit in specification;
3) RH refining operation:
A) RH adopts depths reason, takes out of carbon and is controlled at 0.0005%;
B) RH carries out the alloying outside silica removal composition, and each elemental composition is all controlled in finished product composition range;
C) take out of temperature and be controlled at 1615 ℃;
4) LF stove refining operation:
A) thermometric sampling after standby position stirs 3 minutes;
B), after entering the station, according to RH, take out of sample silicon, aluminium component are carried out to rough adjustment;
C) according to the low-carbon ferrosilicon amount that enters the station sample and add, silicon composition is carried out to accurate adjustment whole;
D) treating processes must not add lime and calcium carbide;
E) control the LF stove treatment time at 12 minutes; Treating processes is controlled argon flow amount, reduces nitrogen pick-up.
Claims (1)
1. improve a method for non orientating silicon steel carbon sulphur composition qualification rate, its technical process comprises desulfurization process, steel making working procedure, RH refining operation operation and the concise operation sequence of LF stove, it is characterized in that, for above, what time is controlled, and concrete steps are as follows:
1) desulfurization process: pre-treatment adopts the dark desulfurization pattern of deeply skimming, de-after sulphur be not more than 0.002%, after processing, molten iron slag scratches clean;
2) steel making working procedure:
A) in tapping temperature, tank, oxygen value and hanging pot temperature are controlled: in rimming steel tapping wt%:C < 0.04, tank oxygen value between 600～900ppm, 1710～1730 ℃ of tapping temperatures, 1655～1675 ℃ of hanging pot temperature;
B) before tapping, block tap hole, special-purpose slag blocking dart is installed, first slag goes out outside tank, controls the lower quantity of slag; In tapping process, by alloy canister, add 10kg/ ton steel lime to carry out modifying process; After tapping finishes, depending on terminal, whether the situation of re-blowing adds different quantities spherical Al slag: one pulls out steel or point while blowing time≤1min, adds the spherical Al slag of 1.7kg/ ton steel; When point blows time > 1.0min, add the spherical Al slag of 2kg/ ton steel;
C) alloying: only add mid-carbon fe-mn in tapping process, adjust manganese composition and limit in specification;
3) RH refining operation:
A) RH adopts depths reason, takes out of carbon and is controlled at below 0.001%;
B) RH carries out the alloying outside silica removal composition, and each elemental composition is all controlled in finished product composition range;
C) take out of temperature and be controlled at 1610～1615 ℃;
4) LF stove refining operation:
A) thermometric sampling after standby position stirs 3 minutes;
B), after entering the station, according to RH, take out of sample silicon, aluminium component are carried out to rough adjustment;
C) according to the low-carbon ferrosilicon amount that enters the station sample and add, silicon composition is carried out to accurate adjustment whole;
D) treating processes must not add lime and calcium carbide;
E) control the LF stove treatment time within 10～13 minutes; Treating processes is controlled argon flow amount, reduces nitrogen pick-up.
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| CN101463410A (en) * | 2007-12-18 | 2009-06-24 | 鞍钢股份有限公司 | Method for producing ultra-low-carbon steel by duplex process |
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Application publication date: 20140903 |