CN102031451A - Vanadium-titanium containing carbon steel and manufacturing method thereof - Google Patents
Vanadium-titanium containing carbon steel and manufacturing method thereof Download PDFInfo
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Abstract
The invention provides vanadium-titanium containing carbon steel and a manufacturing method thereof. The manufacturing method comprises the following steps of: primarily smelting to obtain molten steel; discharging steel to a steel ladle when the content of C in the molten steel is 0.05-0.10 percent, the content of P is not more than 0.015 percent, and the content of S is not more than 0.020 percent; in the process of discharging the steel, regulating the content of Si of the molten steel to be 0.17-0.37 percent, the content of Mn to be 0.35-0.65 percent and the content of oxygen of the molten steel to be below 0.0020 weight percent; controlling the content of Als of the molten steel to be 0.015-0.025 percent, wherein Als represents acid soluble aluminum; regulating the content of oxygen of the molten steel in a steel ladle refining furnace to be below 0.0010 percent; regulating the content of Ti of the molten steel to be 0.005-0.010 percent and the content of V to be 0.02-0.04 percent; and regulating the content of C of the molten steel to be 0.17-0.23 percent so as to obtain the carbon steel, wherein the carbon steel contains the following components in percentage by weight: 0.17-0.23 percent of C, 0.17-0.37 percent of Si, 0.35-0.65 percent of Mn, 0.005-0.010 percent of Ti, 0.005-0.010 percent of Als, 0.02-0.04 percent of V and the balance of Fe and unavoidable impurities.
Description
Technical field
The present invention relates to a kind of carbon steel and manufacture method thereof, particularly a kind of carbon steel that contains the vanadium titanium and manufacture method thereof that can be used for high-duty boiler.
Background technology
The 20G steel is a kind of typical high-duty boiler carbon constructional quality steel among the CNS GB5310-2008 (seamless steel tubes and pipes for high pressure boiler), and it comprises 0.17%～0.23% C, 0.17%～0.37% Si, 0.35%～0.65% Mn by weight, be not more than 0.025% P, be not more than 0.015% S, be not more than 0.20% Cu, be not more than 0.25% Cr, be not more than 0.25% Ni, be not more than 0.15% Mo and be not more than 0.08% V.
Research and production practice show that the aluminium in the steel is very big to the quality influence of 20G steel, and the key of producing the 20G steel is how to control Alt in the steel (full aluminium).For example, " 20g high-duty boiler with the quality control of seamless tube " (" steel rolling " the 19th volume the 4th phase 20-22 page or leaf) reported the quality control situation of producing 20g high-duty boiler steel, in this article, for aluminate in the greying that prevents and avoid carbon steel and soft steel and the steel is mingled with influence to the product cold-forming property, should limit residual Al content w in the steel (Als (sour molten aluminium))≤0.010%, and be necessary further to stablize residual Al content, and be controlled in 0.006%～0.008% the scope, improve the pipe surface quality." 100t electric furnace produce 20G process practice " (" Nangang's science and technology and management " 2007 the 1st phase the 21st～23 page) thinks that also [Als] in the steel easily causes " steel bonding " in the poling process, so the 20G tube blank steel requires [Als] less than 0.010%, therefore deoxidization technique is chosen as bulk deoxidation based on Si, few with or without the Al deoxidation.In a word, with regard to present 20G high-duty boiler steel production technology, the Alt in the chemical composition is the emphasis of control, and it is the most basic requirement that the Alt that recommends among the GB5310-2008 is not more than 0.015%, and a lot of manufacturers even requirement are controlled below the Alt to 0.010%.
Usually; adopting residually in the steel that bof process smelts has 0.004%～0.006% nitrogen; if but material condition difference or misoperation; for example selected the high raw material of nitrogen content for use; the perhaps naked arc heating of LF stove (ladle refining furnace); perhaps the argon shield in the casting cycle is bad etc., can make limit nitrogen content reach 0.009%.Generally, the aluminium administration of fixed of the nitrogen in the steel, otherwise nitrogen can be present in the form of free state in the steel, and it is ageing to increase steel, reduces impact resistance, and serious also can cause the steel premature failure.
As mentioned above, in the production technology of existing 20G steel, should take low Alt route.Yet low excessively Alt can cause and have a certain amount of free nitrogen in the steel, and it is ageing to increase steel, reduces impact resistance, and serious also can cause the steel premature failure.
Summary of the invention
The invention provides a kind of carbon steel and manufacture method thereof that contains the vanadium titanium, thereby overcome the one or more technical problems in the above-mentioned technical problem.
The carbon steel that contains the vanadium titanium according to the present invention comprises 0.17%～0.23% C, 0.17%～0.37% Si, 0.35%～0.65% Mn, 0.005%～0.010% Ti, 0.005%～0.010% Als and 0.02%～0.04% V by weight, surplus is Fe and unavoidable impurities, and wherein Als represents sour molten aluminium.
Unavoidable impurities can comprise and is not more than 0.025% P, is not more than 0.015% S, is not more than 0.009% N, is not more than 0.20% Cu, is not more than 0.25% Cr, is not more than 0.25% Ni and is not more than 0.15% Mo in the carbon steel.
The manufacture method of the carbon steel that contains the vanadium titanium according to an aspect of the present invention may further comprise the steps: (a) first steel-making water; (b) be 0.05%～0.10% at the C of molten steel content, P content is not more than 0.015%, and S content is not more than at 0.020% o'clock, taps to ladle; (c) in tapping process, the Si content of adjusting molten steel is 0.17%～0.37%, and Mn content is 0.35%～0.65%, and the oxygen level of adjustment molten steel is below 0.0020%; (d) the Als content of control molten steel is 0.015%～0.025%, and Als represents sour molten aluminium; (e) in ladle refining furnace, adjust the oxygen level of molten steel below 0.0010%; (f) the Ti content of adjustment molten steel is 0.005%～0.010%, and V content is 0.02%～0.04%; (g) the C content of adjustment molten steel is 0.17%～0.23%, thereby obtain containing the carbon steel of vanadium titanium, this carbon steel comprises 0.17%～0.23% C, 0.17%～0.37% Si, 0.35%～0.65% Mn, 0.005%～0.010% Ti, 0.005%～0.010% Als and 0.02%～0.04% V, surplus is Fe and unavoidable impurities, and the content of each element is weight percent content in the carbon steel.
In step (a), can adopt converter just to make steel water.
In step (c), can adopt the oxygen level of at least a adjustment molten steel in aluminium ferromanganese, ferro-aluminum, ferrosilicon, manganese metal and the low carbon ferromanganese below 0.0020%.
In step (c), can adopt ferrosilicon to control the Si content of molten steel, adopt at least a Mn content of controlling molten steel in manganese metal, aluminium ferromanganese and the low carbon ferromanganese.
Can in step (d), add the Al content that aluminium is controlled molten steel to molten steel.
In step (e), can adopt CaC
2Or CaC
2Adjust the oxygen level of molten steel below 0.0010% with the combination of aluminium.
Step (a) can be included in the interior smelting molten iron of converter and obtain molten steel, can adopt CaC in step (e)
2The oxygen level of adjusting molten steel is below 0.0010%, CaC
2Usage quantity (kg) can be molten iron add-on (ton) * 95% * (1.8～2.2) * (0.7～1.0).
In ladle refining furnace, molten steel was heated 5 minutes after 10 minutes, can adjust the Ti content and the V content of molten steel, the step of adjusting the Ti content of molten steel can comprise ferro-titanium is added molten steel, and the step of adjusting the V content of molten steel can comprise ferro-vanadium is added molten steel.
With heating 5 minutes to 10 minutes molten steel after ferro-titanium and the ferro-vanadium adding molten steel, stop heating then, can feed the C content that carbon is adjusted molten steel to molten steel.
This manufacture method also can be included in step (g) and afterwards molten steel be carried out continuous casting, and the temperature that continuous casting is operated the molten steel in the employed tundish is 1530 ℃～1560 ℃.
The manufacture method of the carbon steel that contains the vanadium titanium according to a further aspect of the invention may further comprise the steps: (a) first steel-making water; (b) be 0.05%～0.10% at the C of molten steel content, P content is not more than 0.015%, and S content is not more than at 0.020% o'clock, taps to ladle; (c) in tapping process, the Si content of adjusting molten steel is 0.17%～0.37%, and Mn content is 0.35%～0.65%, and the oxygen level of adjustment molten steel is below 0.0020%; (d) the Als content of control molten steel is 0.015%～0.025%, and Als represents sour molten aluminium; (e) oxygen level of adjusting molten steel in ladle refining furnace is below 0.0010%, and the C content of adjusting molten steel is 0.17%～0.23%; (f) molten steel being carried out the circulating vacuum degassing handles, and the Ti content of adjusting molten steel is 0.005%～0.010%, V content is 0.02%～0.04%, thereby obtain containing the carbon steel of vanadium titanium, this carbon steel comprises 0.17%～0.23% C, 0.17%～0.37% Si, 0.35%～0.65% Mn, 0.005%～0.010% Ti, 0.005%～0.010% Als and 0.02%～0.04% V, surplus is Fe and unavoidable impurities, and the content of each element is weight percent content in the carbon steel.
In step (a), can adopt converter just to make steel water.
In step (c), can adopt the oxygen level of at least a adjustment molten steel in aluminium ferromanganese, ferro-aluminum, ferrosilicon, manganese metal and the low carbon ferromanganese below 0.0020%.
In step (c), can adopt ferrosilicon to control the Si content of molten steel, can adopt at least a Mn content of controlling molten steel in manganese metal, aluminium ferromanganese and the low carbon ferromanganese.
Can in step (d), add the Al content that aluminium is controlled molten steel to molten steel.
In step (e), can adopt CaC
2Or CaC
2Adjust the oxygen level of molten steel below 0.0010% with the combination of aluminium.
Step (a) can be included in the interior smelting molten iron of converter and obtain molten steel, can adopt CaC in step (e)
2The oxygen level of adjusting molten steel is below 0.0010%, CaC
2Usage quantity (kg) can be molten iron add-on (ton) * 95% * (1.8～2.2) * (0.7～1.0).
Can be in ladle refining furnace heating stopped heating in 5 minutes to 10 minutes after to molten steel, feed the C content that carbon is adjusted molten steel to molten steel then.
Molten steel is carried out step that the circulating vacuum degassing handles can be included in and in the RH vacuum unit molten steel is carried out vacuum outgas and handle, be not more than at pressure that the vacuum treated time can be no less than 10 minutes under the condition of 300Pa.
The step of adjusting the Ti content of molten steel can comprise ferro-titanium is added molten steel, and the step of adjusting the V content of molten steel can comprise ferro-vanadium is added molten steel.
This manufacture method also can be included in step (f) and afterwards molten steel be carried out continuous casting, and the temperature that continuous casting is operated the molten steel in the employed tundish is 1530 ℃～1560 ℃.
According to carbon steel and the manufacture method thereof that contains the vanadium titanium of the present invention, the N in the steel is fixed fully, promptly can avoid the existence of free nitrogen effectively, thus ageing when having reduced and prevented the reduction of impact resistance as boiler steel.In addition, the carbon steel that contains the vanadium titanium of the present invention has very low Als or Alt, can the cold working at rear portion not had a negative impact.
Embodiment
The carbon steel that contains the vanadium titanium according to the present invention comprises 0.17%～0.23% C, 0.17%～0.37% Si, 0.35%～0.65% Mn, 0.005%～0.010% Ti, 0.005%～0.010% Als (sour molten aluminium) and 0.02%～0.04% V by weight percentage, and surplus is Fe and unavoidable impurities.The content of all components that relates in this manual, is weight percent content.
Can comprise according to unavoidable impurities in the carbon steel that contains the vanadium titanium of the present invention and to be not more than 0.025% P, to be not more than 0.015% S, to be not more than 0.009% N, to be not more than 0.20% Cu, to be not more than 0.25% Cr, to be not more than 0.25% Ni and to be not more than 0.15% Mo.
N in the steel is the elemental gas that is difficult to remove.Usually, adopt and residual in the steel that bof process smelts 0.004%～0.006% nitrogen to be arranged.If the exposed for a long time heating of electric arc (submerged arc is bad) during LF stove (ladle refining furnace) refining, perhaps the argon shield in the casting cycle is bad etc., and then nitrogen in steel content may reach 0.007%; If re-use nitrogenous high raw material, for example use high nitrogenous pitch coke carburetting, use the byproduct aluminium ash of producing electrolytic aluminum to carry out slag making etc., then also can make the molten steel nitrogen content reach 0.009%.According to the present invention, take into full account bof process and smelted the various nitrogen pick-up factors that steel may occur, the maximum nitrogen content that limits the carbon steel that contains the vanadium titanium is 0.009%.
Ti fixes N in the steel by forming firm titanium nitride (TiN) particle with N, but the tiny TiN particle crystal grain of refinement steel also.If Ti content is less than 0.005%, then steel intermediate gap nitrogen-atoms is fixed fully inadequately, and, can increase the cold worked difficulty in rear portion of steel and/or the toughness of reduction steel in this case because Ti content uses the Als and/or the V of too high levels to fix N (as described later) very little.If Ti content greater than 0.010%, then can produce the square inclusion of large-sized TiN, scratch base steel easily and form the internal fissure source, thereby reduce the fatigue property of steel.Therefore, the carbon steel that contains the vanadium titanium of the present invention comprises 0.005%～0.010% Ti.
Aluminium in the steel is divided into two types.A kind of is the deoxidation products Al that has little time to float to when smelting in the slag
2O
3In aluminium because Al
2O
3Can not be dissolved in the acid, form Al so will combine with oxygen
2O
3Aluminium be called sour insoluble aluminium.Another kind is to be mainly contained the aluminium in pure aluminum and the aluminium nitride (AlN) by sour dissolved aluminium, and it is called sour molten aluminium, usually with " Als " expression.Sour molten aluminium and sour insoluble aluminium sum are called full aluminium in the steel, usually with " Al " or " Alt " expression.General molten steel is through after the refining, and having among the Alt more than 90% is Als, and perhaps Als content approximates Alt content.The alleged sour molten aluminium of the present invention refers to be present in as mentioned above in the steel can be by sour dissolved aluminium (Als), the statement of related amount to the molten aluminium of acid refer to above-mentioned can be by the amount of sour dissolved aluminium element.
In the smelting process of steel, add aluminium as deoxidant element.In addition, though the avidity of Al and N is weaker than the avidity of Ti and N, aluminium also can fix N in the steel by forming the AlN particle with N, but the tiny AlN particle crystal grain of refinement steel also.If Als content less than 0.005%, is then consolidated the N DeGrain, and and because the Ti and/or the V of the too little use of Als content too high levels fix N, the toughness that is easy to produce the square inclusion of large-sized TiN and/or reduces steel.If Als content, then can increase the cold worked difficulty in rear portion of steel greater than 0.010%.Therefore, the carbon steel that contains the vanadium titanium of the present invention comprises 0.005%～0.010% Als.
The avidity of V and N is weaker than the avidity of Al and N, fixes N in the steel but V can form vanadium nitride (VN) particle with N equally.If V content is less than 0.02%, the DeGrain of fix N then, and use the Ti and/or the Al of too high levels to fix N because V content is too little, the cold worked difficulty in rear portion that is easy to produce the square inclusion of large-sized TiN and/or increases steel.If V content greater than 0.04%, then can reduce the toughness of steel.Therefore, the carbon steel that contains the vanadium titanium of the present invention comprises 0.02%～0.04% V.
0.005%～0.010% Ti in the carbon steel that contains the vanadium titanium of the present invention, 0.005%～0.010% Als and 0.02%～0.04% V can fixedly be no more than 0.009% N in the steel fully, thereby reduce the ageing of steel to greatest extent.
Manufacture method according to the carbon steel that contains the vanadium titanium of first embodiment of the invention comprises just steel-making water and LF stove refined molten steel.Hereinafter, with the manufacture method of describing in detail according to the carbon steel that contains the vanadium titanium of first embodiment of the invention.
At first, can in converter, add molten iron, utilize the function of Converter Oxigen Blowing decarburization, molten iron just is smelt molten steel.When molten steel just refines C content is 0.05%～0.10%, and P content is not more than 0.015%, and S content is not more than at 0.020% o'clock, taps to ladle.
In tapping process, can add pre-deoxidant and alloying material to ladle, the oxygen level of molten steel is removed to below 0.0020%, control Si content is 0.17%～0.37%, control Mn content is 0.35%～0.65%.Pre-deoxidant can comprise aluminium matter pre-deoxidant.Aluminium matter pre-deoxidant can comprise at least a among aluminium ferromanganese FeAlMn, the ferro-aluminum FeAl etc.Alloying material can comprise at least a in ferrosilicon (FeSi), aluminium ferromanganese, manganese metal and the low carbon ferromanganese.In addition, the Si in the alloying material, Mn also have the effect of deoxidation.Deoxidation mode in this step is the bulk deoxidation mode, and promptly the oxygen in the molten steel and the Al, the Si that are added and Mn generate the oxide compound that is insoluble to molten steel or composite oxides and separate out, and float in the slag on the deoxidation products of Sheng Chenging then.
Then, with aluminium (for example aluminum steel) feeding molten steel, the Als content of control steel is 0.015%～0.025%.Here, control Als content is 0.015%～0.025%, considers that rear portion refining procedure and optional continuous casting steel machine operation all may exist Als to change into Al
2O
3Phenomenon.Find that through further investigation if just in the refining process Als content is being controlled to 0.015%～0.025%, the Als content that then can guarantee the cooled strand of continuous casting is in 0.005%～0.010% scope.
Afterwards, adopt the LF stove under the condition of Argon, to carry out liquid steel refining.Specifically, can at first add CaC as reductor
2Or CaC
2Combination with aluminium (for example Al ball) begins electrically heated then.In refining process, because CaC
2And the proportion of aluminium (for example Al ball) is less than the proportion of molten steel, so reductor (that is CaC, that adds
2Or CaC
2Combination with aluminium) mainly is present in the slag and sloughs oxygen in the slag.Because the oxygen level of slag less than the oxygen level of molten steel, so the oxygen in the molten steel is delivered in the slag, is removed by the reductor in the slag then, this deoxidation mode is called the diffusive deoxidation mode.Electrically heated in the refining process has guaranteed the molten state of slag, plays a role thereby be convenient to reductor.
Reductor CaC
2Or CaC
2Be as the criterion below 0.0010% with the oxygen level in the control molten steel with the add-on of the combination of aluminium (for example Al ball).
CaC
2Deoxidation products comprise CO gas, can make furnace gas have certain reductibility, can make simultaneously the slag foaming, help the heating of LF stove submerged arc, reduce the possibility that molten steel absorbs airborne nitrogen.Therefore, the present invention preferably uses CaC separately
2As reductor.Using CaC separately
2Content is that the add-on of calcium carbide (unit is kg) can be molten iron add-on (tonnage) * 95% * (1.8～2.2), to guarantee the Control for Oxygen Content in the molten steel below 0.0010% under the situation of calcium carbide as reductor more than 70%.
In the LF stove to molten steel electrically heated 5 minutes after 10 minutes, adjust the Ti content and the V content of molten steel, make that the Ti content in the molten steel is 0.005%～0.010%, V content is 0.02%～0.04%.For example, ferrotianium (FeTi) alloy is added molten steel adjust Ti content, vanadium iron (FeV) alloy is added molten steel adjust V content.If molten steel underheating was just adjusted Ti content and V content in 5 minutes, then the slag above the molten steel can all not become molten state, is unfavorable for that ferro-titanium and ferro-vanadium pass slag blanket and enter molten steel, promptly can not guarantee the rate of recovery of Ti, V.If adjust Ti content and V content after molten steel heating being longer than time of 10 minutes, then the LF stove activity duration long, can not guarantee the rhythm of production of steel, may cause that continuous caster is disconnected to be watered, increase the production cost of steel, reduce the operating efficiency of equipment.
Then, to molten steel reheat 5 minutes to 10 minutes, stop heating, carbon is fed molten steel, the C content of adjusting molten steel is 0.17%～0.23%.In one embodiment, adopt feeding wire machine feeding carbon cored-wire to adjust the C content of molten steel.If adjust C content after in the LF stove, the molten steel reheat being no less than time of 5 minutes, then can guarantee the ferro-titanium and the ferro-vanadium fusing that add, and Ti, V element are evenly distributed in the molten steel.If adjust C content after in the LF stove, the molten steel reheat being surpassed time of 10 minutes, then the LF stove activity duration long, can not guarantee the rhythm of production of steel, may cause that continuous caster is disconnected to be watered, increase the production cost of steel, reduce the operating efficiency of equipment.
The temperature of molten steel is determined by the liquidus temperature of steel in the liquid steel refining process.The liquidus temperature that contains the carbon steel of vanadium titanium of the present invention is 1508～1517 ℃.In the manufacture method according to the carbon steel that contains the vanadium titanium of first embodiment of the invention, the temperature of molten steel is the liquidus temperature of molten steel or the temperature slightly higher than liquidus temperature in the refining process.
When ladle is tapped, can bring a certain amount of converter slag inevitably in converter in ladle.Converter slag phosphorus content height, under the effect of LF stove reducing atmosphere, a part of phosphorus in the slag is got back in the molten steel once more, and the P element is slightly increased.Yet, be not more than 0.015% because when the converter smelting molten steel, P content is controlled to, so, can not surpass 0.025% although P content slightly increases.
In refining process, can remove the S in the molten steel significantly.This is because the CaC in the reductor
2Make slag that good reductibility be arranged, and increase the CaO content in the slag, so FeS in molten steel and the slag and CaO reaction generate CaS and remove significantly.
The impurity element that may comprise in the carbon steel of the present invention (or being called residual element) Cu, Cr, Ni, Mo can not remove from molten steel by above-mentioned first steel-making water and LF stove refined molten steel.Therefore, can control the content of these elements in the carbon steel of the present invention by the content of these impurity elements in the control raw material (being molten iron).
According to the manufacture method of the carbon steel of first embodiment of the invention, by smelting molten steel in converter, pass through the refining of LF stove again, N content in the steel can be controlled at below 0.009%.For example, at least a mode in can be in the following manner is controlled at N content in the steel below 0.009%: carry out bottom blowing with Ar gas all the time in the process of bessemerizing; Change bottom blown gas into Ar gas by nitrogen bessemerizing the later stage; In LF stove refining process, make the slag foamed, avoid the direct and airborne nitrogen of air contact ionization of electric arc.
The manufacture method of the carbon steel that contains the vanadium titanium by first embodiment of the invention, obtain the carbon steel that contains the vanadium titanium of the present invention, it comprises 0.17%～0.23% C, 0.17%～0.37% Si, 0.35%～0.65% Mn, 0.005%～0.010% Ti, 0.005%～0.010% Als (sour molten aluminium) and 0.02%～0.04% V by weight, and surplus is Fe and unavoidable impurities.The unavoidable impurities of this carbon steel can comprise and is not more than 0.025% P, is not more than 0.015% S, is not more than 0.009% N, is not more than 0.20% Cu, is not more than 0.25% Cr, is not more than 0.25% Ni and is not more than 0.15% Mo.
According to the manufacture method of the carbon steel of first embodiment of the invention, only in the first refining process of molten steel, add aluminium as pre-deoxidant, in the refined molten steel at rear portion, can not add aluminium, so deoxidation products Al
2O
3Floating interval of floating dock is long, is easy to produce Al
2O
3Poor high quality steel.
Be also to be included in the step of the continuous casting after the LF stove refined molten steel according to the manufacture method of the carbon steel that contains the vanadium titanium of second embodiment of the invention and difference according to the manufacture method of the carbon steel that contains the vanadium titanium of first embodiment of the invention.The liquidus temperature that contains the carbon steel of vanadium titanium of the present invention is 1508～1517 ℃, and the temperature of continuous casting tundish is controlled at 1530 ℃～1560 ℃.This temperature range can realize by the electrically heated of front LF stove, specifically, the temperature of molten steel is a liquidus temperature or than temperature loss (for example 40～50 ℃)+tundish superheating temperature (for example 20～35 ℃) of the slightly high temperature+ladle of liquidus temperature to tundish in the LF stove refining process.The temperature of tundish molten steel is controlled at 1530 ℃～1560 ℃, can guarantee molten steel under the low overheat condition all casting finish.
Manufacture method according to the carbon steel of third embodiment of the invention comprises steel-making water, LF stove refined molten steel and RH vacuum outgas (the circulating vacuum degassing) just.Hereinafter, with the manufacture method of describing in detail according to the carbon steel of third embodiment of the invention.
At first, can in converter, add molten iron, utilize the function of Converter Oxigen Blowing decarburization, molten iron just is smelt molten steel.When molten steel just refines C content is 0.05%～0.10%, and P content is not more than 0.015%, and S content is not more than at 0.020% o'clock, taps to ladle.
In tapping process, can add pre-deoxidant and alloying material to ladle, the oxygen level of molten steel is removed to below 0.0020%, control Si content is 0.17%～0.37%, control Mn content is 0.35%～0.65%.Pre-deoxidant can comprise aluminium matter pre-deoxidant.Aluminium matter pre-deoxidant can comprise at least a among aluminium ferromanganese FeAlMn, the ferro-aluminum FeAl etc.Alloying material can comprise at least a in ferrosilicon (FeSi), aluminium ferromanganese, manganese metal and the low carbon ferromanganese.In addition, the Si in the alloying material, Mn also have the effect of deoxidation.Deoxidation mode in this step is the bulk deoxidation mode, and promptly the oxygen in the molten steel and the Al, the Si that are added and Mn generate the oxide compound that is insoluble to molten steel or composite oxides and separate out, and float in the slag on the deoxidation products of Sheng Chenging then.
Then, with aluminium (for example aluminum steel) feeding molten steel, the Als content of control steel is 0.015%～0.025%.Here, control Als content is 0.015%～0.025%, considers that rear portion refining procedure, RH vacuum outgas and optional continuous casting steel machine operation all may exist Als to change into Al
2O
3Phenomenon.Find that through further investigation if just in the refining process Als content is being controlled to 0.015%～0.025%, the Als content that then can guarantee the cooled strand of continuous casting is in 0.005%～0.010% scope.
Afterwards, adopt the LF stove under the condition of Argon, to carry out liquid steel refining.Specifically, can at first add CaC as reductor
2Or CaC
2Combination with aluminium (for example Al ball) begins electrically heated then.In refining process, because CaC
2And the proportion of aluminium (for example Al ball) is less than the proportion of molten steel, so reductor (that is CaC, that adds
2Or CaC
2Combination with aluminium) mainly is present in the slag and sloughs oxygen in the slag.Because the oxygen level of slag less than the oxygen level of molten steel, so the oxygen in the molten steel is delivered in the slag, is removed by the reductor in the slag then, this deoxidation mode is called the diffusive deoxidation mode.Electrically heated in the refining process has guaranteed the molten state of slag, plays a role thereby be convenient to reductor.
Reductor CaC
2Or CaC
2Be as the criterion below 0.0010% with the oxygen level in the control molten steel with the add-on of the combination of aluminium (for example Al ball).
CaC
2Deoxidation products comprise CO gas, can make furnace gas have certain reductibility, can make simultaneously the slag foaming, help the heating of LF stove submerged arc, reduce the possibility that molten steel absorbs airborne nitrogen.Therefore, the present invention preferably uses CaC separately
2As reductor.Using CaC separately
2Content is that the add-on of calcium carbide (unit is kg) can be molten iron add-on (tonnage) * 95% * (1.8～2.2), to guarantee the Control for Oxygen Content in the molten steel below 0.0010% under the situation of calcium carbide as reductor more than 70%.
To molten steel heating 5 minutes to 10 minutes, stop heating in the LF stove, carbon is fed molten steel, the C content of adjusting molten steel is 0.17%～0.23%.In one embodiment, adopt feeding wire machine feeding carbon cored-wire to adjust the C content of molten steel.If adjust C content after in the LF stove, the molten steel reheat being no less than time of 5 minutes, then can guarantee reductor CaC
2Or CaC
2With the fusing of the combination of aluminium (for example Al ball), have only the oxygen that just can slough after the reductor fusing in the slag, further make molten steel carry out diffusive deoxidation.If adjust C content after in the LF stove, the molten steel reheat being surpassed time of 10 minutes, then the LF stove activity duration long, can not guarantee the rhythm of production of steel, may cause that continuous caster is disconnected to be watered, increase the production cost of steel, reduce the operating efficiency of equipment.
The temperature of molten steel is determined by the liquidus temperature of steel in the liquid steel refining process.The liquidus temperature that contains the carbon steel of vanadium titanium of the present invention is 1508～1517 ℃.In the manufacture method according to the carbon steel that contains the vanadium titanium of third embodiment of the invention, the temperature of molten steel is the loss temperature (for example 30～40 ℃) of the liquidus temperature of molten steel or the temperature slightly higher than liquidus temperature+RH vacuum outgas in the refining process.
Then, molten steel is carried out the RH vacuum outgas handle, the main effect that the RH vacuum outgas is handled is the hydrogen in the steel is removed to lower level.Specifically, can carry out vacuum-treat to molten steel in the RH vacuum unit, the treatment time that is not more than 300Pa vacuum treated total time with pressure was as the criterion more than 10 minutes.
In the process that the RH vacuum outgas is handled, adjust the Ti content and the V content of molten steel, make that the Ti content in the molten steel is 0.005%～0.010%, V content is 0.02%～0.04%.For example, ferrotianium (FeTi) alloy is added molten steel adjust Ti content, vanadium iron (FeV) alloy is added molten steel adjust V content.
The impurity element that may comprise in the carbon steel of the present invention (or being called residual element) Cu, Cr, Ni, Mo can not handle by above-mentioned first steel-making water, LF stove refined molten steel and RH vacuum outgas and remove from molten steel.Therefore, can control the content of these elements in the carbon steel of the present invention by the content of these impurity elements in the control raw material (being molten iron).
According to the manufacture method of the carbon steel that contains the vanadium titanium of third embodiment of the invention, by smelting molten steel in converter, handle through LF stove refining and RH vacuum outgas again, N content in the steel can be controlled at below 0.009%.For example, at least a mode in can be in the following manner is controlled at N content in the steel below 0.009%: carry out bottom blowing with Ar gas all the time in the process of bessemerizing; Change bottom blown gas into Ar gas by nitrogen bessemerizing the later stage; In LF stove refining process, make the slag foamed, avoid the direct and airborne nitrogen of air contact ionization of electric arc.
The manufacture method of the carbon steel that contains the vanadium titanium by third embodiment of the invention, obtain the carbon steel that contains the vanadium titanium of the present invention, it comprises 0.17%～0.23% C, 0.17%～0.37% Si, 0.35%～0.65% Mn, 0.005%～0.010% Ti, 0.005%～0.010% Als (sour molten aluminium) and 0.02%～0.04% V by weight, and surplus is Fe and unavoidable impurities.The unavoidable impurities of this carbon steel can comprise and is not more than 0.025% P, is not more than 0.015% S, is not more than 0.009% N, is not more than 0.20% Cu, is not more than 0.25% Cr, is not more than 0.25% Ni and is not more than 0.15% Mo.
According to the manufacture method of the carbon steel that contains the vanadium titanium of third embodiment of the invention, only in the first refining process of molten steel, add aluminium as pre-deoxidant, in handling, the refined molten steel at rear portion and RH vacuum outgas can not add aluminium, so deoxidation products Al
2O
3Floating interval of floating dock is long, is easy to produce Al
2O
3Poor high quality steel.
Be the step of the continuous casting after also being included in the RH vacuum outgas handles according to the manufacture method of the carbon steel that contains the vanadium titanium of fourth embodiment of the invention and difference according to the manufacture method of the carbon steel that contains the vanadium titanium of third embodiment of the invention.The liquidus temperature that contains the carbon steel of vanadium titanium of the present invention is 1508～1517 ℃, and the temperature of continuous casting tundish is controlled at 1530 ℃～1560 ℃.This temperature range can realize by the electrically heated of front LF stove, specifically, the temperature of molten steel is temperature loss (for example 40～50 ℃)+tundish superheating temperature (for example 20～35 ℃) of loss temperature (for example 30～40 ℃)+ladle of liquidus temperature or the temperature+RH vacuum outgas slightly higher than liquidus temperature to tundish in the LF stove refining process.The temperature of tundish molten steel is controlled at 1530 ℃～1560 ℃, can guarantee molten steel under the low overheat condition all casting finish.
Further specify carbon steel and the manufacture method thereof that contains the vanadium titanium of the present invention below in conjunction with example.
Example 1:
In nominal capacity is the converter of 120 tons (actual tap is 125 tons～135 tons), add 140 tons of molten iron, utilize the function of Converter Oxigen Blowing decarburization that molten iron just is smelt molten steel.When molten steel just refines C content is 0.05%, and P content is 0.011%, and S content is 0.010%, and Si content is 0.02%, and Mn content is 0.03% o'clock, and beginning is tapped to ladle.The amount of the molten steel after converter smelting is finished is 133 tons.
In tapping process, add FeAl (aluminium content is 40%, and all the other the are Fe) 350kg molten steel oxygen level can be removed to below 0.0020% to ladle, and FeSi (Si content is 73%, all the other are Fe) 500kg and metal M n (Mn content is 98%, and all the other are Fe) 660kg.After adding, recording molten steel actual oxygen content with apparatus for determination of oxygen is 0.0015%, and Si and Mn content are increased to 0.24% and 0.48% respectively in the molten steel.Then, with the Al line 28kg feeding molten steel of feeding wire machine with φ 10mm, the Als content of control molten steel is 0.025%.
Afterwards, in the LF stove with 50kg Al ball and 270kg calcium carbide (CaC
2Content is more than 75%) add molten steel, heat then.Heat after 5 minutes, sampling analysis, the N content of molten steel is 0.0065%, C content is 0.08%.Continue heating then, (Ti content is 30% to add FeTi30-A (the ferrotianium trade mark among the GB GB/T3282-2006) 40kg simultaneously, all the other are Fe, the Ti rate of recovery is about 75%) (the raw material molten iron is for containing the Ti molten iron, even so do not add ferrotianium, all the time residual 0.003% the Ti of having an appointment in the molten steel) and FeV80A (the vanadium iron trade mark among the GB GB/T4139-2004) (V content is 80% to 24.5kg, all the other are Fe, the V rate of recovery is about 95%) (the raw material molten iron is for containing the V molten iron, even so do not add vanadium iron, residual all the time 0.006% the V of having an appointment in the molten steel).Continue heating then and stop heating after 6 minutes, in molten steel, feed carbon dust 200kg (with the form feeding of carbonaceous cored-wire, this cored-wire is to make with the thick iron sheet parcel carbon dust of 0.6mm, and the carbon dust C content is not less than 90%) with feeding wire machine.Recording molten steel actual oxygen content with apparatus for determination of oxygen is 0.0008%.Sampling analysis, the Ti content of molten steel, V content, Als content and C content are respectively 0.009%, 0.02%, 0.011% and 0.20%.
At last, on 6 machines, 6 stream billet casters, molten steel casting is become the strand of 280mm * 380mm.Tundish temperature is 1540 ℃ during continuous casting.The chemical composition of getting tundish steel sample analysis steel is 0.21% C, 0.25% Si, 0.48% Mn, 0.009% Ti, 0.02% V, 0.010% Als, 0.011% Alt, 0.011% P, 0.009% S, 0.05% Cu, 0.04% Cr, 0.04% Ni and 0.03% Mo, and all the other are Fe and other unavoidable impurities.
280mm * 380mm continuously cast bloom forges into φ 30mm pole, and then is machined to the pole of φ 5 * 10mm and φ 15 * 60mm.Press total N content that GB/T 20124-2006 measures the pole of φ 5 * 10mm.Molten → distillation that the pole of φ 15 * 60mm passes through constant-current electrolysis → collection residue → (phosphoric acid+sulfuric acid) acid adopts the indophenol blue absorption spectrophotometry to measure chemical combination N content at last.Total N content is 0.0085%, and chemical combination N content is 0.0084%, and the Ti of this explanation 0.009%, 0.02% V, 0.010% Als be the N in the steel fully fixedly.
Example 2:
In nominal capacity is the converter of 120 tons (actual tap is 125 tons～135 tons), add 140 tons of molten iron, utilize the function of Converter Oxigen Blowing decarburization that molten iron just is smelt molten steel.When molten steel just refines C content is 0.10%, and P content is 0.014%, and S content is 0.015%, and Si content is 0.05%, and Mn content is 0.08% o'clock, and beginning is tapped to ladle.The amount of the molten steel after converter smelting is finished is 133 tons.
In tapping process, add FeAl (aluminium content is 40%, and all the other the are Fe) 350kg molten steel oxygen level can be removed to below 0.0020% to ladle, and FeSi (Si content is 73%, all the other are Fe) 320kg and metal M n (Mn content is 98%, and all the other are Fe) 810kg.After adding, recording molten steel actual oxygen content with apparatus for determination of oxygen is 0.0017%, and Si and Mn content are increased to 0.19% and 0.63% respectively in the molten steel.Then, with the Al line 20kg feeding molten steel of feeding wire machine with φ 10mm, the Als content of control molten steel is 0.016%.
Afterwards, in the LF stove with 50kg Al ball and 270kg calcium carbide (CaC
2Content is more than 75%) add molten steel, heat then.Heat after 5 minutes, sampling analysis, the N content of molten steel is 0.0050%, C content is 0.13%.Continue heating then, (Ti content is 30% to add FeTi30-A (the ferrotianium trade mark among the GB GB/T3282-2006) 41kg simultaneously, all the other are Fe, the Ti rate of recovery is about 75%) (the raw material molten iron is for containing the Ti molten iron, even so do not add ferrotianium, all the time residual 0.003% the Ti of having an appointment in the molten steel) and FeV80A (the vanadium iron trade mark among the GB GB/T4139-2004) (V content is 80% to 42kg, all the other are Fe, the V rate of recovery is about 95%) (the raw material molten iron is for containing the V molten iron, even so do not add vanadium iron, residual all the time 0.006% the V of having an appointment in the molten steel).Continue heating then and stop heating after 7 minutes, in molten steel, feed carbon dust 80kg (with the form feeding of carbonaceous cored-wire, this cored-wire is to make with the thick iron sheet parcel carbon dust of 0.6mm, and the carbon dust C content is not less than 90%) with feeding wire machine.Recording molten steel actual oxygen content with apparatus for determination of oxygen is 0.0005%.Sampling analysis, the Ti content of molten steel, V content, Als content and C content are respectively 0.010%, 0.03%, 0.006% and 0.18%.
At last, on 6 machines, 6 stream billet casters, molten steel casting is become the strand of 280mm * 380mm.Tundish temperature is 1545 ℃ during continuous casting.The chemical composition of getting tundish steel sample analysis steel is 0.22% C, 0.19% Si, 0.64% Mn, 0.010% Ti, 0.032% V, 0.005% Als, 0.005% Alt, 0.017% P, 0.010% S, 0.04% Cu, 0.05% Cr, 0.03% Ni and 0.03% Mo, and all the other are Fe and other unavoidable impurities.
280mm * 380mm continuously cast bloom forges into φ 30mm pole, and then is machined to the pole of φ 5 * 10mm and φ 15 * 60mm.Press total N content that GB/T 20124-2006 measures the pole of φ 5 * 10mm.Molten → distillation that the pole of φ 15 * 60mm passes through constant-current electrolysis → collection residue → (phosphoric acid+sulfuric acid) acid adopts the indophenol blue absorption spectrophotometry to measure chemical combination N content at last.Total N content is 0.0075%, and chemical combination N content is 0.0073%, and the Ti of this explanation 0.010%, 0.032% V, 0.005% Als be the N in the steel fully fixedly.
Example 3:
In nominal capacity is the converter of 120 tons (actual tap is 125 tons～135 tons), add 135 tons of molten iron, utilize the function of Converter Oxigen Blowing decarburization that molten iron just is smelt molten steel.When molten steel just refines C content is 0.08%, and P content is 0.010%, and S content is 0.008%, and Si content is 0.02%, and Mn content is 0.05% o'clock, and beginning is tapped to ladle.The amount of the molten steel after converter smelting is finished is 128 tons.
In tapping process, add FeAl (aluminium content is 40%, and all the other the are Fe) 350kg molten steel oxygen level can be removed to below 0.0020% to ladle, and FeSi (Si content is 73%, all the other are Fe) 720kg and metal M n (Mn content is 98%, and all the other are Fe) 470kg.After adding, recording molten steel actual oxygen content with apparatus for determination of oxygen is 0.0016%, and Si and Mn content are increased to 0.35% and 0.38% respectively in the molten steel.Then, with the Al line 25kg feeding molten steel of feeding wire machine with φ 10mm, the Als content of control molten steel is 0.015%.
Afterwards, in the LF stove with 25kg Al ball and 260kg calcium carbide (CaC
2Content is more than 75%) add molten steel, heat then.Heat after 5 minutes, sampling analysis, the N content of molten steel is 0.0056%, C content is 0.09%; Continue heating 5 minutes then, after heating finishes, in molten steel, feed carbon dust 220kg (with the form feeding of carbonaceous cored-wire, this cored-wire is to make with the thick iron sheet parcel carbon dust of 0.6mm, and the carbon dust C content is not less than 90%) with feeding wire machine.Recording molten steel actual oxygen content with apparatus for determination of oxygen is 0.0005%.
Then, the molten steel after the processing of LF stove is transferred to the RH vacuum unit.The pure treatment time of vacuum unit is 12 minutes, and ultimate pressure is controlled to be 300Pa.Under ultimate pressure, handle and add FeTi30-A (the ferrotianium trade mark among the GB GB/T3282-2006) 30kg after 5 minutes (Ti content is 30%, all the other are Fe, the Ti rate of recovery is about 75%) (the raw material molten iron is for containing the Ti molten iron, even so do not add ferrotianium, all the time residual 0.003% the Ti of having an appointment in the molten steel) and FeV80A (the vanadium iron trade mark among the GB GB/T4139-2004) (V content is 80% to 57kg, all the other are Fe, the V rate of recovery is about 95%) (the raw material molten iron is for containing the V molten iron, even so do not add vanadium iron, residual all the time 0.006% the V of having an appointment in the molten steel).After vacuum-treat finishes, sampling analysis, the Ti content of molten steel, V content, Als content and C content are respectively 0.008%, 0.040%, 0.007% and 0.23%.
At last, on 6 machines, 6 stream billet casters, molten steel casting is become the strand of 280mm * 380mm.Tundish temperature is 1550 ℃ during continuous casting.The chemical composition of getting tundish steel sample analysis steel is 0.23% C, 0.36% Si, 0.37% Mn, 0.008% Ti, 0.040% V, 0.006% Als, 0.006% Alt, 0.011% P, 0.005% S, 0.05% Cu, 0.05% Cr, 0.04% Ni and 0.03% Mo, and all the other are Fe and other unavoidable impurities.
280mm * 380mm continuously cast bloom forges into φ 30mm pole, and then is machined to the pole of φ 5 * 10mm and φ 15 * 60mm.Press total N content that GB/T 20124-2006 measures the pole of φ 5 * 10mm.Molten → distillation that the pole of φ 15 * 60mm passes through constant-current electrolysis → collection residue → (phosphoric acid+sulfuric acid) acid adopts the indophenol blue absorption spectrophotometry to measure chemical combination N content at last.Total N content is 0.0074%, and chemical combination N content is 0.0074%, and the Ti of this explanation 0.008%, 0.040% V, 0.006% Als be the N in the steel fully fixedly.
Example 4:
In nominal capacity is the converter of 120 tons (actual tap is 125 tons～135 tons), add 130 tons of molten iron, utilize the function of Converter Oxigen Blowing decarburization that molten iron just is smelt molten steel.When molten steel just refines C content is 0.06%, and P content is 0.008%, and S content is 0.010%, and Si content is 0.03%, and Mn content is 0.06% o'clock, and beginning is tapped to ladle.The amount of the molten steel after converter smelting is finished is 123 tons.
In tapping process, add FeAl (aluminium content is 40%, and all the other the are Fe) 350kg molten steel oxygen level can be removed to below 0.0020% to ladle, and FeSi (Si content is 73%, all the other are Fe) 700kg and metal M n (Mn content is 98%, and all the other are Fe) 460kg.After adding, recording molten steel actual oxygen content with apparatus for determination of oxygen is 0.0019%, and Si and Mn content are increased to 0.36% and 0.40% respectively in the molten steel.Then, with the Al line 26kg feeding molten steel of feeding wire machine with φ 10mm, the Als content of control molten steel is 0.016%.
Afterwards, in the LF stove with 25kg Al ball and 260kg calcium carbide (CaC
2Content is more than 75%) add molten steel, heat then.Heat after 5 minutes, sampling analysis, the N content of molten steel is 0.0062%, C content is 0.09%; Continue heating 5 minutes then, after heating finishes, in molten steel, feed carbon dust 170kg (with the form feeding of carbonaceous cored-wire, this cored-wire is to make with the thick iron sheet parcel carbon dust of 0.6mm, and the carbon dust C content is not less than 90%) with feeding wire machine.Recording molten steel actual oxygen content with apparatus for determination of oxygen is 0.0006%.
Then, the molten steel after the processing of LF stove is transferred to the RH vacuum unit.The pure treatment time of vacuum unit is 12 minutes, and ultimate pressure is controlled to be 300Pa.Under ultimate pressure, handle and add FeTi30-A (the ferrotianium trade mark among the GB GB/T3282-2006) 11kg after 5 minutes (Ti content is 30%, all the other are Fe, the Ti rate of recovery is about 75%) (the raw material molten iron is for containing the Ti molten iron, even so do not add ferrotianium, all the time residual 0.003% the Ti of having an appointment in the molten steel) and FeV80A (the vanadium iron trade mark among the GB GB/T4139-2004) (V content is 80% to 31kg, all the other are Fe, the V rate of recovery is about 95%) (the raw material molten iron is for containing the V molten iron, even so do not add vanadium iron, residual all the time 0.006% the V of having an appointment in the molten steel).After vacuum-treat finishes, sampling analysis, the Ti content of molten steel, V content, Als content and C content are respectively 0.005%, 0.025%, 0.008% and 0.20%.
At last, on 6 machines, 6 stream billet casters, molten steel casting is become the strand of 280mm * 380mm.Tundish temperature is 1550 ℃ during continuous casting.The chemical composition of getting tundish steel sample analysis steel is 0.20% C, 0.36% Si, 0.38% Mn, 0.005% Ti, 0.025% V, 0.007% Als, 0.008% Alt, 0.010% P, 0.009% S, 0.05% Cu, 0.05% Cr, 0.04% Ni and 0.03% Mo, and all the other are Fe and other unavoidable impurities.
280mm * 380mm continuously cast bloom forges into φ 30mm pole, and then is machined to the pole of φ 5 * 10mm and φ 15 * 60mm.Press total N content that GB/T 20124-2006 measures the pole of φ 5 * 10mm.Molten → distillation that the pole of φ 15 * 60mm passes through constant-current electrolysis → collection residue → (phosphoric acid+sulfuric acid) acid adopts the indophenol blue absorption spectrophotometry to measure chemical combination N content at last.Total N content is 0.0079%, and chemical combination N content is 0.0075%, and the Ti of this explanation 0.005%, 0.025% V, 0.007% Als be the N in the steel fully fixedly.
Claims (25)
1. manufacture method that contains the carbon steel of vanadium titanium may further comprise the steps:
(a) first steel-making water;
(b) be 0.05%～0.10% at the C of molten steel content, P content is not more than 0.015%, and S content is not more than at 0.020% o'clock, taps to ladle;
(c) in tapping process, the Si content of adjusting molten steel is 0.17%～0.37%, and Mn content is 0.35%～0.65%, and the oxygen level of adjustment molten steel is below 0.0020%;
(d) the Als content of control molten steel is 0.015%～0.025%, and Als represents sour molten aluminium;
(e) in ladle refining furnace, adjust the oxygen level of molten steel below 0.0010%;
(f) the Ti content of adjustment molten steel is 0.005%～0.010%, and V content is 0.02%～0.04%;
(g) the C content of adjustment molten steel is 0.17%～0.23%, thereby obtains containing the carbon steel of vanadium titanium,
The described carbon steel that contains the vanadium titanium comprises 0.17%～0.23% C, 0.17%～0.37% Si, 0.35%～0.65% Mn, 0.005%～0.010% Ti, 0.005%～0.010% Als and 0.02%～0.04% V, surplus is Fe and unavoidable impurities, and the content that contains each element in the carbon steel of vanadium titanium is weight percent content.
2. manufacture method according to claim 1, wherein, unavoidable impurities comprises and is not more than 0.025% P, is not more than 0.015% S, is not more than 0.009% N, is not more than 0.20% Cu, is not more than 0.25% Cr, is not more than 0.25% Ni and is not more than 0.15% Mo in the described carbon steel that contains the vanadium titanium.
3. manufacture method according to claim 1 wherein, adopts converter just to make steel water in step (a).
4. manufacture method according to claim 1 wherein, adopts the oxygen level of at least a adjustment molten steel in aluminium ferromanganese, ferro-aluminum, ferrosilicon, manganese metal and the low carbon ferromanganese below 0.0020% in step (c).
5. manufacture method according to claim 1 wherein, adopts ferrosilicon to control the Si content of molten steel in step (c), adopts at least a Mn content of controlling molten steel in manganese metal, aluminium ferromanganese and the low carbon ferromanganese.
6. manufacture method according to claim 1 wherein, adds the Al content that aluminium is controlled molten steel to molten steel in step (d).
7. manufacture method according to claim 1 wherein, adopts CaC in step (e)
2Or CaC
2Adjust the oxygen level of molten steel below 0.0010% with the combination of aluminium.
8. manufacture method according to claim 3, wherein, step (a) is included in the interior smelting molten iron of converter and obtains molten steel, adopts CaC in step (e)
2The oxygen level of adjusting molten steel is below 0.0010%, CaC
2Usage quantity be molten iron add-on * 95% * (1.8～2.2) * (0.7～1.0), described CaC
2The unit of usage quantity be kg, the unit of described molten iron add-on is a ton.
9. manufacture method according to claim 1, wherein, in ladle refining furnace, molten steel is heated Ti content and the V content of adjusting molten steel in 5 minutes after 10 minutes, the step of adjusting the Ti content of molten steel comprises ferro-titanium added molten steel, and the step of adjusting the V content of molten steel comprises ferro-vanadium is added molten steel.
10. manufacture method according to claim 9 wherein, adds molten steel afterwards to molten steel heating 5 minutes to 10 minutes with ferro-titanium and ferro-vanadium, stops heating then, adjusts the C content of molten steel to molten steel feeding carbon.
11. manufacture method according to claim 1, wherein, described manufacture method also is included in step (g) and afterwards molten steel is carried out continuous casting, and the temperature that continuous casting is operated the molten steel in the employed tundish is 1530 ℃～1560 ℃.
12. a manufacture method that contains the carbon steel of vanadium titanium may further comprise the steps:
(a) first steel-making water;
(b) be 0.05%～0.10% at the C of molten steel content, P content is not more than 0.015%, and S content is not more than at 0.020% o'clock, taps to ladle;
(c) in tapping process, the Si content of adjusting molten steel is 0.17%～0.37%, and Mn content is 0.35%～0.65%, and the oxygen level of adjustment molten steel is below 0.0020%;
(d) the Als content of control molten steel is 0.015%～0.025%, and Als represents sour molten aluminium;
(e) oxygen level of adjusting molten steel in ladle refining furnace is below 0.0010%, and the C content of adjusting molten steel is 0.17%～0.23%;
(f) molten steel carried out the circulating vacuum degassing and handle, and the Ti content of adjusting molten steel is 0.005%～0.010% that V content is 0.02%～0.04%, thereby obtains containing the carbon steel of vanadium titanium,
The described carbon steel that contains the vanadium titanium comprises 0.17%～0.23% C, 0.17%～0.37% Si, 0.35%～0.65% Mn, 0.005%～0.010% Ti, 0.005%～0.010% Als and 0.02%～0.04% V, surplus is Fe and unavoidable impurities, and the content that contains each element in the carbon steel of vanadium titanium is weight percent content.
13. manufacture method according to claim 12, wherein, unavoidable impurities comprises and is not more than 0.025% P, is not more than 0.015% S, is not more than 0.009% N, is not more than 0.20% Cu, is not more than 0.25% Cr, is not more than 0.25% Ni and is not more than 0.15% Mo in the described carbon steel that contains the vanadium titanium.
14. manufacture method according to claim 12 wherein, adopts converter just to make steel water in step (a).
15. manufacture method according to claim 12 wherein, adopts the oxygen level of at least a adjustment molten steel in aluminium ferromanganese, ferro-aluminum, ferrosilicon, manganese metal and the low carbon ferromanganese below 0.0020% in step (c).
16. manufacture method according to claim 12 wherein, adopts ferrosilicon to control the Si content of molten steel in step (c), adopts at least a Mn content of controlling molten steel in manganese metal, aluminium ferromanganese and the low carbon ferromanganese.
17. manufacture method according to claim 12 wherein, adds the Al content that aluminium is controlled molten steel to molten steel in step (d).
18. manufacture method according to claim 12 wherein, adopts CaC in step (e)
2Or CaC
2Adjust the oxygen level of molten steel below 0.0010% with the combination of aluminium.
19. manufacture method according to claim 14, wherein, step (a) is included in the interior smelting molten iron of converter and obtains molten steel, adopts CaC in step (e)
2The oxygen level of adjusting molten steel is below 0.0010%, CaC
2Usage quantity be molten iron add-on * 95% * (1.8～2.2) * (0.7～1.0), described CaC
2The unit of usage quantity be kg, the unit of described molten iron add-on is a ton.
20. manufacture method according to claim 12, wherein, heating stopped heating in 5 minutes after 10 minutes to molten steel in ladle refining furnace, adjusted the C content of molten steel then to molten steel feeding carbon.
21. manufacture method according to claim 12, wherein, molten steel is carried out step that the circulating vacuum degassing handles be included in and in the RH vacuum unit molten steel carried out vacuum outgas and handle, be not more than at pressure that the vacuum treated time is no less than 10 minutes under the condition of 300Pa.
22. manufacture method according to claim 12, wherein, the step of adjusting the Ti content of molten steel comprises ferro-titanium added molten steel, and the step of adjusting the V content of molten steel comprises ferro-vanadium is added molten steel.
23. manufacture method according to claim 12, wherein, described manufacture method also is included in step (f) and afterwards molten steel is carried out continuous casting, and the temperature that continuous casting is operated the molten steel in the employed tundish is 1530 ℃～1560 ℃.
24. carbon steel that contains the vanadium titanium, the described carbon steel that contains the vanadium titanium comprises 0.17%～0.23% C, 0.17%～0.37% Si, 0.35%～0.65% Mn, 0.005%～0.010% Ti, 0.005%～0.010% Als and 0.02%～0.04% V by weight, surplus is Fe and unavoidable impurities, and wherein Als represents sour molten aluminium.
25. the carbon steel that contains the vanadium titanium according to claim 24, wherein, unavoidable impurities comprises and is not more than 0.025% P, is not more than 0.015% S, is not more than 0.009% N, is not more than 0.20% Cu, is not more than 0.25% Cr, is not more than 0.25% Ni and is not more than 0.15% Mo in the described carbon steel that contains the vanadium titanium.
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|---|---|---|---|---|
| CN104962827A (en) * | 2015-05-14 | 2015-10-07 | 宁波汇通机械联接件有限公司 | Annular joint and processing method |
| CN107828952A (en) * | 2017-11-30 | 2018-03-23 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel Bar and its LF stove production methods are built containing V, Ti, Cr microalloy |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11229075A (en) * | 1998-02-18 | 1999-08-24 | Sumitomo Metal Ind Ltd | High strength steel excellent in delayed breakdown resistance, and its production |
| CN1780929A (en) * | 2003-05-28 | 2006-05-31 | 住友金属工业株式会社 | Oil well steel pipe to be placed under ground and be expanded |
-
2010
- 2010-10-26 CN CN 201010519802 patent/CN102031451B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11229075A (en) * | 1998-02-18 | 1999-08-24 | Sumitomo Metal Ind Ltd | High strength steel excellent in delayed breakdown resistance, and its production |
| CN1780929A (en) * | 2003-05-28 | 2006-05-31 | 住友金属工业株式会社 | Oil well steel pipe to be placed under ground and be expanded |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104962827A (en) * | 2015-05-14 | 2015-10-07 | 宁波汇通机械联接件有限公司 | Annular joint and processing method |
| CN107828952A (en) * | 2017-11-30 | 2018-03-23 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel Bar and its LF stove production methods are built containing V, Ti, Cr microalloy |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102031451B (en) | 2012-09-05 |
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