CN104060053A - Low alloy steel production method - Google Patents
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Abstract
The invention discloses a low alloy steel production method which is characterized in that the method comprises the following steps: 1) treatment in a converter, to be more specific, desulphurized molten steel is added into a steelmaking converter, under oxygen supply condition, a slagging material is added for steelmaking slagging, when the molten steel temperature reaches 1650 to 1700 DEG C, oxygen supply is stopped, argon is combinedly blew for stirring, and after combined blowing argon for stirring, the slag is pushed off to discharge steel to obtain first molten steel; 2) RH vacuum treatment, to be more specific, the first molten steel enters into a RH processing working station for vacuum supply and gas flow improvement, then under vacuum condition, first batch carbon powder, an aluminum pill deoxidizer, an alloying material and second batch carbon powder are successively added into the first molten steel, and second molten steel is obtained by vacuum treatment; and 3) continuous casting processing, to be more specific, the second molten steel is continuously casted. The low alloy steel production method can greatly reduce low alloy steel production cost, and significantly improve the purity of molten steel.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, particularly, relate to a kind of method of producing low alloy steel.
Background technology
The production of low alloy steel often adopts converter-continuous casting process to carry out, and, generally can be by carrying out deoxidation after Converter, so that postorder carries out desulfurization and refining removal is mingled with.
CN101451177A discloses a kind of non-metal composite steel-smelting reductor and method of deoxidation, by adding a kind of non-metal composite steel-smelting reductor to reach the free oxygen of removing in molten steel and the object that reduces the oxidisability index of ladle slag in the production process of low alloy steel, use this reductor to replace aluminium alloy of the prior art to carry out deoxidation in steel making, can avoid the expensive aluminium alloy of a large amount of uses in deoxidation of molten steel, and because nonmetal composite deoxidation material does not occur floating and wraps up in slag phenomenon, deoxidation effect is good.But, in tapping process, use this composite deoxidant easily to produce a large amount of oxide compounds, in molten steel, form inclusion, thereby affect Molten Steel Cleanliness, and production cost is high, be unfavorable for the low cost production of low alloy steel.
CN102108430A discloses a kind of LF furnace refining and blowing passivation reductor, adopts the method for this reductor deoxidation to be: passivation reductor is sprayed in molten steel and carried out deoxidation operation by LF powder monitor, and injection amount scope is at 0.2-1.5kg reductor/ton steel.Product of the present invention and method realize the efficient deoxidation to molten steel, and speed of response is fast; In ensureing deoxidation effect, can ensure continuous casting direct motion.But the method operational path is long, high to equipment requirements, the reductor using when deoxidation is CaC
2, easily form inclusion.
Summary of the invention
The object of this invention is to provide a kind of method of producing low alloy steel, can reduce in the method for the invention the consumption of expensive aluminum shot reductor, thereby significantly reduced the production cost of low alloy steel, and can produce standard compliant low alloy steel.
In order to reduce the production cost of low alloy steel, the present invention is optimized from the technical process of producing low alloy steel, adopts the operation of converter-RH-continuous casting.Technique after optimization, does not carry out deoxidation at converter tapping process, carries out carbon deoxidation cheaply but adopt in vacuum.Adopt the method to greatly reduce the production cost of low alloy steel, obviously improved the purity of molten steel, at home and beyond example.
The invention provides a kind of method of producing low alloy steel, the method comprises the following steps:
1) processing in converter: the molten steel after desulfurization is blended in steel-making converter, under oxygen supply condition, add slag making materials to carry out steelmaking slagging, oxygen feeding stop start multiple blowing argon gas and stir after liquid steel temperature reaches 1650-1700 DEG C, stopping after multiple blowing argon gas stirs carrying out pushing off the slag tapping, obtain the first molten steel;
2) RH vacuum-treat: make described the first molten steel enter RH and process station, start to vacuumize and control lift gas flow, then under vacuum condition, in the first molten steel, add first carbon dust, aluminum shot reductor and alloying raw material and second batch carbon dust successively, after vacuum-treat, obtain the second molten steel;
3) continuous casting processing: the second molten steel obtaining is carried out to continuous casting.
In the production method of low alloy steel provided by the invention, use cheap carbon dust to replace most of expensive aluminum shot reductor, in ensureing that the continuously cast bloom of producing meets the standard of low alloy steel completely, greatly reduce production cost.
Other features and advantages of the present invention are described in detail the embodiment part subsequently.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
[O] of the present invention represents the concentration of free oxygen in molten steel; T[O] be the concentration of total oxygen in molten steel, it comprises oxygen contained in free oxygen and oxide compound; " gas " in described control lift gas flow is " argon gas "; Described " molten steel " is the metallic solution of steel-making use; Described " vacuum tightness " is absolute pressure.
The invention provides a kind of method of producing low alloy steel, the method comprises the following steps:
1) processing in converter: the molten steel after desulfurization is blended in steel-making converter, under oxygen supply condition, add slag making materials to carry out steelmaking slagging, oxygen feeding stop start multiple blowing argon gas and stir after liquid steel temperature reaches 1650-1700 DEG C, stopping after multiple blowing argon gas stirs carrying out pushing off the slag tapping, obtain the first molten steel;
2) RH vacuum-treat: make described the first molten steel enter RH and process station, start to vacuumize and control lift gas flow, then under vacuum condition, in the first molten steel, add first carbon dust, aluminum shot reductor and alloying raw material and second batch carbon dust successively, after vacuum-treat, obtain the second molten steel;
3) continuous casting processing: the second molten steel obtaining is carried out to continuous casting.
Oxygen supply condition of the present invention comprises adopting and oxygen rifle is set realizes, and oxygen lance position is 1.5-2.5m, and described rifle position is the distance of liquid steel level to oxygen rifle muzzle.
Under optimum condition, slag making materials in the step 1) of the method for the invention can be quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting, and the add-on of quickened lime is that the add-on of 15-20kg/ ton molten steel, quartz sand is that the add-on of 10-15kg/ ton molten steel, high magnesium lime is that the add-on of 10-15kg/ ton molten steel and sludge ball of steel smelting is 2-3kg/ ton molten steel.Further, under preferable case, described slag making materials all adds in oxygen rifle starts the 0-10min after oxygen supply.Wherein, the add-on of described slag making materials is that total amount taking the molten steel after desulfurization is as benchmark.
The step 1) of the method for the invention is oxygen feeding stop after liquid steel temperature reaches 1650-1700 DEG C, preferably in stove, adds the high magnesium lime of 2-6kg/ ton molten steel again, and utilizes bottom-blowing of converter argon gas to stir 1-5min.
Under preferable case, carry out pushing off the slag tapping in the step 1) of the method for the invention time, in tapping process, in the ladle of splendid attire the first molten steel, add at least one in mid-carbon fe-mn 0.5-1.0kg/ ton molten steel, quickened lime 4-8kg/ ton molten steel and fluorite 0.5-2kg/ ton molten steel.Wherein, the add-on of described mid-carbon fe-mn, quickened lime and fluorite is that total amount taking the first molten steel is as benchmark.
Under preferable case, the temperature of the first molten steel obtaining in the step 1) of the method for the invention is 1550-1650 DEG C, taking the total amount of the first molten steel as benchmark, the main component of described the first molten steel is: 0.02-0.06 % by weight C, 0.04-0.06 % by weight Mn, 0.005-0.020 % by weight P, 0.005-0.030 % by weight S, 0.050-0.080 % by weight [O], Fe and inevitable impurity.
Under preferable case, the step 2 of the method for the invention) in, the add-on of described first carbon dust is calculated according to formula (1),
Formula (1): G=W × (0.75 × ([O]
1× 10
6+ 200)-[C] × 10
6);
Wherein, the add-on that G is first carbon dust, unit is kg; [C] is the carbon content in the first molten steel; [O]
1it is the oxygen activity of the first molten steel; W is the weight of the first molten steel, and unit is kg;
Preferably, the add-on of described aluminum shot reductor is calculated according to formula (2),
Formula (2): Q=1.2 × [O]
2× W;
Wherein, W is the weight of the first molten steel, and unit is kg; Q is the add-on of aluminum shot reductor, and unit is kg; [O]
2for the molten steel oxygen activity add first carbon dust in the first molten steel after and before adding aluminum shot reductor.
According to calculation formula of the present invention (1), wherein, effective in the time that G is positive number, as for negative value carbon dust add-on be 0kg.
Preferably, in the time that G is positive number described in first carbon dust add one or more times, and each add-on is no more than 25kg, the timed interval that at every turn adds carbon dust is 1-3min.If contriver very easily causes molten steel splash while adding the amount of carbon dust to exceed 25kg by a large amount of experiment discoveries at every turn.
Under preferable case, the step 2 of the method for the invention) in, under vacuum condition, be 9-12kPa to adding the vacuum tightness of first carbon dust in molten steel.
Under preferable case, the step 2 of the method for the invention) in, the vacuum tightness when adding aluminum shot reductor in molten steel is 60-300Pa.
Under preferable case, the step 2 of the method for the invention) in, be that aluminum shot reductor adds in rear 2-4min the opportunity that adds of alloying raw material and second batch carbon dust, described alloying raw material is mid-carbon fe-mn 0-1kg/ ton molten steel and/or middle carbon duriron 0-2kg/ ton molten steel, is preferably mid-carbon fe-mn 0.001-1kg/ ton molten steel and/or middle carbon duriron 0.001-2kg/ ton molten steel.Wherein, the add-on of described mid-carbon fe-mn, middle carbon duriron is that total amount taking the first molten steel is as benchmark.The each add-on of described second batch carbon dust is no more than 25kg, and the timed interval that at every turn adds carbon dust is 1-3min.
Under preferable case, the step 2 of the method for the invention) in, the process of described control lift gas flow comprises: add first carbon dust to finish from starting to be evacuated down to, gas flow control is 1600-1800NL/min; From adding first carbon dust to finish to adding alloying raw material and second batch carbon dust to finish, gas flow control is 2000-2500NL/min; From adding alloying raw material and second batch carbon dust to finish to RH vacuum-treat, gas flow control is 1800-2000NL/min.
Under preferable case, the step 2 of the method for the invention) in, after RH vacuum-treat finishes, described method also comprises that the ladle to being loaded with the second molten steel carries out BOTTOM ARGON BLOWING processing, described BOTTOM ARGON BLOWING flow is 50-150NL/min, is preferably 80-100NL/min, and argon blowing time is 8-20min.
A preferred embodiment of the invention, the method for producing low alloy steel comprises the following steps:
1) processing in converter: oxygen rifle is set, and oxygen lance position is 1.5-2.5m, molten steel after desulfurization is blended in steel-making converter, under oxygen supply condition, add slag making materials to carry out steelmaking slagging, described slag making materials is quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting, and the add-on of quickened lime is 15-20kg/ ton molten steel, the add-on of quartz sand is 10-15kg/ ton molten steel, the add-on of high magnesium lime is that the add-on of 10-15kg/ ton molten steel and sludge ball of steel smelting is 2-3kg/ ton molten steel, described slag making materials all adds in oxygen rifle starts the 0-8min after oxygen supply, oxygen feeding stop after liquid steel temperature reaches 1650-1700 DEG C, in converter, add again high magnesium lime 4-6kg/ ton molten steel, then carry out argon bottom-blowing in converter and stir 1-5min, argon blowing rate is 80-120NL/min, finally carry out pushing off the slag tapping and obtain the first molten steel, and in the ladle of splendid attire the first molten steel, add mid-carbon fe-mn 0.5-1.0kg/ ton molten steel in tapping process, at least one in quickened lime 4-8kg/ ton molten steel and fluorite 0.5-2kg/ ton molten steel.The temperature of the first molten steel is 1550-1650 DEG C, and main component is: 0.02-0.06 % by weight C, 0.04-0.10 % by weight Mn, 0.005-0.020 % by weight P, 0.005-0.030 % by weight S, 0.050-0.080 % by weight [O], Fe and inevitable impurity.
2) RH processes: determination step 1) in the first molten steel of obtaining the first oxygen activity and carbon content when entering RH and processing station, then lift gas flow, under vacuum condition, in the time keeping vacuum tightness to be 60-300Pa, in molten steel, add first carbon dust, the oxygen activity of again measuring in molten steel is the second oxygen activity, then in molten steel, add aluminum shot reductor, wherein, the add-on of described first carbon dust is calculated according to formula (1), and described in the time that G is positive number, first carbon dust adds one or more times, and each add-on is no more than 25kg, the timed interval that at every turn adds carbon dust is 1-3min, as for negative value carbon dust add-on be 0kg, vacuum tightness while keeping adding carbon dust is 9-12kPa,
Formula (1): G=W × (0.75 × ([O]
1× 10
6+ 200)-[C] × 10
6);
Wherein, the add-on that G is first carbon dust, unit is kg; [C] is the carbon content in the first molten steel; [O]
1it is the oxygen activity of the first molten steel; W is the weight of the first molten steel, and unit is kg;
And the add-on of described aluminum shot reductor is calculated according to formula (2);
Formula (2): Q=1.2 × [O]
2× W;
Wherein, W is the weight of the first molten steel, and unit is kg, and Q is the add-on of aluminum shot reductor, and unit is kg; [O]
2for the molten steel oxygen activity add first carbon dust in the first molten steel after and before adding aluminum shot reductor.
After aluminum shot adds, in 2-4min, be 0-1kg/ ton molten steel and middle carbon duriron 0-2kg/ ton molten steel to adding second batch carbon dust, mid-carbon fe-mn in molten steel.Thereby obtain the second molten steel, wherein, control whole step 2) in the process of lift gas flow be: add first carbon dust to finish from starting to be evacuated down to, gas flow control is 1600-1800NL/min; From adding first carbon dust to finish to adding alloying raw material and second batch carbon dust to finish, gas flow control is 2000-2500NL/min; From adding alloying raw material and second batch carbon dust to finish to RH vacuum-treat, gas flow control is 1800-2000NL/min, after RH vacuum-treat finishes, described method can also comprise that the ladle to being loaded with the second molten steel carries out BOTTOM ARGON BLOWING processing, described BOTTOM ARGON BLOWING flow is 50-150NL/min, and argon blowing time is 8-20min.
3) continuous casting processing: the second molten steel obtaining is carried out to continuous casting.
Below will describe the present invention by embodiment.The starting material that use in following examples are in case of no particular description all purchased from Panzhihua Steel City Group Co., Ltd., and concrete composition is:
The composition of mid-carbon fe-mn is: the Fe of the Mn of 77 % by weight and 21 % by weight, all the other are impurity.
The composition of middle carbon duriron is: the Fe of the Si of 78 % by weight and 21 % by weight, all the other are impurity.
The composition of carbon dust is: sulphur, the volatile matter of 1.1 % by weight and the water of 0.5 % by weight of the C of 94 % by weight, the ash content of 3.5 % by weight, 0.15 % by weight, granularity is 3-15mm.
The composition of aluminum shot is: the Al of 99.9 % by weight, all the other are trace element and impurity.
Embodiment 1
Half steel after desulfurization is blended into blow again steel converter blowing of 210t, the amount of being blended into is 235t, and adopt 536 oxygen rifles to carry out the decarburization of oxygen supply slag making dephosphorization, starting the oxygen blown while, carry out steelmaking slagging, in stove, add slag making materials quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting, and slag making materials is all added opening to blow in oxygen supply 6min, in slag making materials, the add-on of quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting is respectively 18kg/ ton molten steel, 11kg/ ton molten steel, 13.5kg/ ton molten steel and 2.2kg/ ton molten steel; Oxygen feeding stop promote oxygen rifle when oxygen supply 874 seconds, now bessemer furnace slag basicity is 3.1, acquisition temperature is the molten steel of 1687 DEG C, the main component of molten steel: the P of the C of 0.036 % by weight, the Mn of 0.06 % by weight, 0.007 % by weight, the S of 0.014 % by weight, [O] of 0.083 % by weight, Fe and inevitable impurity.And then to the high magnesium lime that adds 3.0kg/ ton molten steel in stove, utilize to blow again and stir 2min, carry out pushing off the slag tapping, in tapping process, in ladle, add quickened lime 3.0kg/ ton molten steel successively.After tapping, in ladle, the first liquid steel temperature is 1615 DEG C, and its composition is P, S, the C of 0.034 % by weight of 0.016 % by weight, the Mn of 0.051 % by weight, [O] of 0.071 % by weight of 0.008 % by weight, Fe and inevitable impurity.
The first molten steel is sent to RH vacuum-treat station, and now temperature is 1608 DEG C, and carbon content is 0.035 % by weight, and [O] is 0.074 % by weight, and molten steel amount is 221t, calculates and need to add carbon dust 80kg according to formula (1).Start to vacuumize, lift gas flow is 1600NL/min, divides and adds carbon dust four times, and each add-on is 20kg, and be 2min each interval time.After carbon dust adds, vacuum tightness is reduced to 290Pa, lift gas flow is adjusted to 2500NL/min, the treatment time that vacuum tightness is 290Pa is 8min; Process after 8min, keep vacuum tightness, recording oxygen activity is 0.0039 % by weight, according to formula (2) calculation result, in the molten steel in vacuum chamber, add aluminum shot 11kg, carry out deoxidation, aluminum shot adds after 2min, then divides and add carbon dust 90kg, middle carbon duriron 300kg and mid-carbon fe-mn 310kg for four times.After alloying raw material adds, adjust lift gas flow to 1800NL/min, continue to process after 7min, vacuum breaker, RH processing finishes.After the argon flow amount BOTTOM ARGON BLOWING 15min of ladle employing 100NL/min, gained the second molten steel is set off.Then ladle is sent to continuous casting.
Be 230mm × 1080mm continuously cast bloom product by the molten steel in this ladle by adopting continuous casting protection pouring Technology to obtain section.
Known to the continuously cast bloom sampling analysis of producing, its T[O] average out to 0.0023 % by weight, carbon content average out to 0.04 % by weight, meets the standard of low alloy steel.
Embodiment 2
Half steel after desulfurization is blended into blow again steel converter blowing of 210t, the amount of being blended into is 235t, and adopt 536 oxygen rifles to carry out the decarburization of oxygen supply slag making dephosphorization, starting the oxygen blown while, carry out steelmaking slagging, in stove, add slag making materials quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting, and slag making materials is all added opening to blow in oxygen supply 7min, in described slag making materials, the add-on of quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting is respectively 19kg/ ton molten steel, 12kg/ ton molten steel, 13kg/ ton molten steel and 2.5kg/ ton molten steel; Oxygen supply time oxygen feeding stop promote oxygen rifle after 920 seconds, now bessemer furnace slag basicity is 3.2, acquisition temperature is the molten steel of 1675 DEG C, the main component of molten steel: the P of the C of 0.041 % by weight, the Mn of 0.05 % by weight, 0.006 % by weight, the S of 0.018 % by weight, [O] of 0.067 % by weight, Fe and inevitable impurity.Then to the high magnesium lime that adds 3.5kg/ ton molten steel in stove, utilize to blow again and stir 3min, carry out pushing off the slag tapping, in tapping process, in ladle, add successively quickened lime 4kg/ ton molten steel and fluorite 0.6kg/ ton molten steel.After tapping, in ladle, the first liquid steel temperature is 1614 DEG C, and its composition is P, S, the C of 0.042 % by weight of 0.020 % by weight, the Mn of 0.05 % by weight, [O] of 0.064 % by weight of 0.007 % by weight, Fe and inevitably impurity.
The first molten steel is sent to RH vacuum-treat, and now temperature is 1602 DEG C, and carbon content is 0.042 % by weight, a[O] be 0.065 % by weight, molten steel amount is 224t, is calculated and need to be added carbon dust 50kg by formula (1).Start to vacuumize, lift gas flow is 1600NL/min, adds at twice carbon dust, and each add-on is 25kg, and be 2min each interval time.After carbon dust adds, vacuum tightness is reduced to 295Pa, lift gas flow is adjusted to 2500NL/min, the treatment time that vacuum tightness is 295Pa is 8min; Process after 8min, keep vacuum tightness, recording oxygen activity is 0.0028 % by weight, then in the molten steel in vacuum chamber, add aluminum shot 8kg according to formula (2) calculation result, carry out deoxidation, aluminum shot adds after 2min, then divides and add carbon dust 92kg, middle carbon duriron 305kg, mid-carbon fe-mn 312kg for four times.After alloy adds, adjust lift gas flow to 1800NL/min, continue to process after 7min, vacuum breaker, RH processing finishes.After the argon flow amount BOTTOM ARGON BLOWING 10min of ladle employing 100NL/min, gained the second molten steel is set off.Then ladle is sent to continuous casting.
Be 230mm × 1080mm continuously cast bloom product by the molten steel in this ladle by adopting continuous casting protection pouring Technology to obtain section.
Known to the continuously cast bloom sampling analysis of producing, its T[O] average out to 0.0022%, carbon content average out to 0.042%, meets the standard of low alloy steel.
Embodiment 3
Half steel after desulfurization is blended into blow again steel converter blowing of 210t, the amount of being blended into is 237t, and adopt 536 oxygen rifles to carry out the decarburization of oxygen supply slag making dephosphorization, starting the oxygen blown while, carry out steelmaking slagging, in stove, add slag making materials quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting, and slag making materials is all added opening to blow in oxygen supply 6min, in slag making materials, the add-on of quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting is respectively 17kg/ ton molten steel, 10kg/ ton molten steel, 15kg/ ton molten steel and 2.3kg/ ton molten steel; Oxygen supply is oxygen feeding stop lifting oxygen rifle after 910 seconds, now bessemer furnace slag basicity is 3.4, and acquisition temperature is the molten steel of 1682 DEG C, the main component of molten steel: 0.055 % by weight C, 0.05 % by weight Mn, 0.004 % by weight P, 0.015%S, [O] of 0.047% weight, Fe and inevitable impurity.Then to the high magnesium lime that adds 3.2kg/ ton molten steel in stove, utilize to blow again and stir 3min, carry out pushing off the slag tapping, in tapping process, in ladle, add quickened lime 4kg/ ton molten steel, in tapping process, add mid-carbon fe-mn 0.5kg/ ton molten steel.Obtain 221 tons, the first molten steel, temperature is 1607 DEG C, and its composition is 0.005 % by weight P, 0.016 % by weight S, 0.056 % by weight C, 0.08 % by weight Mn, 0.045 % by weight [O], Fe and inevitably impurity.
The first molten steel is sent to RH vacuum-treat, and now temperature is 1602 DEG C, and carbon content is 0.056 % by weight, a[O] be 0.046 % by weight, molten steel amount is 226t, does not need to add carbon dust by formula (1) calculation result is known.Start to vacuumize, lift gas flow is 1600NL/min, and vacuum tightness is reduced to 280Pa, and lift gas flow is adjusted to 2500NL/min, and the treatment time that vacuum tightness is 280Pa is 8min; Process after 8min, keep vacuum tightness, recording oxygen activity is 0.0042 % by weight, add aluminum shot 12kg by formula (2) calculation result to molten steel in vacuum chamber, carry out deoxidation, aluminum shot adds after 2min, then divides and add carbon dust 95kg, middle carbon duriron 310kg, mid-carbon fe-mn 313kg for four times.After alloy adds, adjust lift gas flow to 1800NL/min, continue to process after 7min, vacuum breaker, RH processing finishes.After the argon flow amount BOTTOM ARGON BLOWING 8min of ladle employing 80NL/min, gained the second molten steel is set off.Then ladle is sent to continuous casting.
Be 230mm × 1080mm continuously cast bloom product by the molten steel in this ladle by adopting continuous casting protection pouring Technology to obtain section.
Known to the continuously cast bloom sampling analysis of producing, its T[O] average out to 0.0021 % by weight, carbon content average out to 0.045 % by weight, meets the standard of low alloy steel.
Comparative example 1
Produce low alloy steel according to the method described in embodiment 1, difference is after RH enters the station, do not add carbon dust, after decarburization finishes, carry out deoxidation and adopt, and then add the technique of carbon dust, middle carbon duriron and mid-carbon fe-mn, known to the continuously cast bloom sampling analysis of producing, its T[O] average out to 0.0065 % by weight, carbon content average out to 0.046 % by weight, its T[O] too high (higher than 25ppm), do not meet the standard of low alloy steel.
Comparative example 2
Produce low alloy steel according to the method described in embodiment 1, difference is that whole process does not add carbon dust.Known to the continuously cast bloom sampling analysis of producing, its T[O] average out to 0.0095 % by weight, carbon content average out to 0.045 % by weight, its T[O] too high (higher than 25ppm), do not meet the standard of low alloy steel.
Comparative example 3
Produce low alloy steel according to the method described in embodiment 3, difference is to add not according to the requirement of formula of the present invention (2) in the time that RH adds aluminum shot, and only add 5kg, known to the continuously cast bloom sampling analysis of producing, its T[O] average out to 0.0055 % by weight, carbon content average out to 0.045 % by weight, its T[O] too high (higher than 25ppm), do not meet the standard of low alloy steel.
Result by above embodiment 1-3 and comparative example 1-3 can find out, the method for production low alloy steel provided by the invention is used the aluminum shot reductor of small amount can produce standard compliant low alloy steel, thereby greatly reduces the production cost of low alloy steel.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, also can carry out arbitrary combination between various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. a method of producing low alloy steel, is characterized in that, the method comprises the following steps:
1) processing in converter: the molten steel after desulfurization is blended in steel-making converter, under oxygen supply condition, add slag making materials to carry out steelmaking slagging, oxygen feeding stop start multiple blowing argon gas and stir after liquid steel temperature reaches 1650-1700 DEG C, stopping after multiple blowing argon gas stirs carrying out pushing off the slag tapping, obtain the first molten steel;
2) RH vacuum-treat: make described the first molten steel enter RH and process station, start to vacuumize and control lift gas flow, then under vacuum condition, in the first molten steel, add first carbon dust, aluminum shot reductor and alloying raw material and second batch carbon dust successively, after vacuum-treat, obtain the second molten steel;
3) continuous casting processing: by step 2) in the second molten steel of obtaining carry out continuous casting.
2. method according to claim 1, wherein, in step 1), described slag making materials is quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting, and the add-on of quickened lime is that the add-on of 15-20kg/ ton molten steel, quartz sand is that the add-on of 10-15kg/ ton molten steel, high magnesium lime is that the add-on of 10-15kg/ ton molten steel and sludge ball of steel smelting is 2-3kg/ ton molten steel.
3. method according to claim 1, wherein, in step 1), carrying out adding at least one in mid-carbon fe-mn 0.5-1.0kg/ ton molten steel, quickened lime 4-8kg/ ton molten steel and fluorite 0.5-2kg/ ton molten steel in pushing off the slag tapping process in the ladle of splendid attire the first molten steel.
4. method according to claim 1, wherein, in step 2) in, the add-on of described first carbon dust is calculated according to formula (1),
Formula (1): G=W × (0.75 × ([O]
1× 10
6+ 200)-[C] × 10
6);
Wherein, the add-on that G is first carbon dust, unit is kg; [C] is the carbon content in the first molten steel; [O]
1it is the oxygen activity of the first molten steel; W is the weight of the first molten steel, and unit is kg;
Preferably, the add-on of described aluminum shot reductor is calculated according to formula (2),
Formula (2): Q=1.2 × [O]
2× W;
Wherein, W is the weight of the first molten steel, and unit is kg; Q is the add-on of aluminum shot reductor, and unit is kg; [O]
2for the molten steel oxygen activity add first carbon dust in the first molten steel after and before adding aluminum shot reductor.
5. method according to claim 4, wherein, in step 2) in, in the time that G is positive number described in first carbon dust add one or more times, and each add-on is no more than 25kg, the timed interval that at every turn adds carbon dust is 1-3min.
6. according to the method described in claim 1 or 4, wherein, in step 2) in, under vacuum condition, be 9-12kPa to adding the vacuum tightness of first carbon dust in molten steel.
7. according to the method described in claim 1 or 4, wherein, in step 2) in, the vacuum tightness when adding aluminum shot reductor in molten steel is 60-300Pa.
8. according to the method described in claim 1 or 4, wherein, in step 2) in, be that aluminum shot reductor adds in rear 2-4min the opportunity that adds of alloying raw material and second batch carbon dust, described alloying raw material is mid-carbon fe-mn 0-1kg/ ton molten steel and/or middle carbon duriron 0-2kg/ ton molten steel.
9. method according to claim 1, wherein, in step 2) in, the process of described control lift gas flow comprises: add first carbon dust to finish from starting to be evacuated down to, gas flow control is 1600-1800NL/min; From adding first carbon dust to finish to adding alloying raw material and second batch carbon dust to finish, gas flow control is 2000-2500NL/min; From adding alloying raw material and second batch carbon dust to finish to RH vacuum-treat, gas flow control is 1800-2000NL/min.
10. method according to claim 1, wherein, in step 2) in, after RH vacuum-treat finishes, described method also comprises that the ladle to being loaded with the second molten steel carries out BOTTOM ARGON BLOWING processing, described BOTTOM ARGON BLOWING flow is 50-150NL/min, is preferably 80-100NL/min, and argon blowing time is 8-20min.
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