CN109023023B - Method for manufacturing rare earth heat-resistant steel plate - Google Patents
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Abstract
A method for manufacturing rare-earth heat-resistant steel plate includes smelting consumable electrode in MF induction furnace and AOD furnace, electroslag remelting to obtain qualified electroslag plate blank, hot rolling the electroslag plate blank to obtain plate with specified specification, controlling Ce content in consumable electrode at 0.10-0.15%, and electroslag remelting with quinary electroslag system. Compared with the production of a go gauge steel ingot, the chemical composition of the plate can be ensured to be qualified, and the various performances of the product are more excellent due to the improvement of the solidification quality of the electroslag ingot; in addition, the link that cogging must be carried out before rolling is omitted, the production period is shortened, and the method has good economic benefit.
Description
Technical Field
The invention relates to the technical field of rare earth heat-resistant steel, in particular to a method for manufacturing a rare earth heat-resistant steel plate.
Background
The rare earth element has various beneficial effects of purifying molten steel, modifying inclusion, refining grains, microalloying and the like in steel, and can obviously improve the oxidation resistance, high-temperature strength and plasticity, fatigue life, corrosion resistance, crack resistance and the like of the steel. However, rare earth elements are extremely active, and the yield of the rare earth elements is related to various factors such as the deoxidation degree of molten steel, the tapping temperature, the adding time and the like, so that the content of the rare earth elements is difficult to accurately control.
At present, most of rare earth steel only gives the upper limit range of the content of rare earth, and the rare earth is added into the steel as a trace additive for improving the service performance. The rare earth heat-resistant steel 253MA has clear range requirements on rare earth elements (the content of rare earth Ce is required to be 0.03-0.08%), and the high-end 253MA plate needs to be subjected to electroslag remelting to obtain better structure and performance, so that the rare earth elements are further burnt, and the manufacturing difficulty is greatly improved.
The patent "a heat-resistant steel and its preparation method" introduces a rare earth heat-resistant steel with 0.05% -0.5% of rare earth content, firstly covering iron powder on the surface of rare earth particles, isolating air, then adding into deoxidized molten steel to raise the yield of rare earth element to 99.3%, but the rare earth heat-resistant steel related to the patent has wider range of rare earth content, is easy to implement, and does not provide a specific method for stably controlling yield.
The patent "high-performance corrosion-resistant rare earth super-strong double-phase stainless steel and its smelting process" provides a smelting method of rare earth double-phase stainless steel (Re is less than or equal to 0.2%)Re-Mg-Ca is adopted to treat molten steel during consumable electrode smelting, and ReO is adopted during electroslag remelting2：MgO：CaO：CaF2：Al2O3Remelting five-membered slag system of 10%, 50%, 20%, and continuously adding active Re-Mg-Ca reducing agent into slag pool during electroslag remelting to control rare earth burning loss, but the deoxidation effect is not good from the practical smelting effect (O)]= 30-50 ppm), the fluctuation of the rare earth content in the steel after electroslag is large (Re =0.0096% -0.055%), so the method is only suitable for the steel grade with the upper limit requirement on the rare earth, and has great risk if the steel grade has the upper and lower limit ranges on the rare earth.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for manufacturing a rare earth heat-resistant steel plate, which not only has stable and controllable rare earth content in the electrode smelting and electroslag remelting processes, but also can directly feed an electroslag remelting plate blank into a rolling mill to be rolled into a plate. Compared with the production of a go gauge steel ingot, the chemical composition of the plate can be ensured to be qualified, and the various performances of the product are more excellent due to the improvement of the solidification quality of the electroslag ingot; in addition, the link that cogging must be carried out before rolling is omitted, the production period is shortened, and the method has good economic benefit.
In order to realize the technical purpose, the adopted technical scheme is as follows: a method for manufacturing rare earth heat-resistant steel plates, wherein the rare earth heat-resistant steel firstly adopts a medium frequency induction furnace and an AOD furnace to smelt a consumable electrode, then is subjected to electroslag remelting to prepare a qualified electroslag plate blank, and finally is subjected to hot rolling by a rolling mill to form plates with specified specifications, the method comprises the following steps:
the method comprises the following steps: smelting a consumable electrode by adopting a medium-frequency induction furnace and an AOD furnace, controlling the content of rare earth Ce in the consumable electrode to be 0.10-0.15% during smelting, adding crystal silicon for pre-deoxidation according to 2.0-2.5 Kg/t, then adding 1.0-1.5 Kg/t of Al wire for deep deoxidation, adjusting Si in steel to be 1.6-1.7% before tapping, [ O ] is controlled to be below 30ppm, controlling the tapping temperature to be 1580 +/-10 ℃, adding 1Kg/t of SiAlBaCa alloy for deoxidation during tapping, wherein the SiAlBaCa alloy comprises 35% of Si, 10% of Ca, 10% of Ba, 12% of Al and the balance of Fe according to the weight percentage, then adding rare earth Ce-La alloy into steel flow according to the yield of 60-70%, wherein the Ce-La alloy comprises 62-68% of Ce and 32-38% of La according to the weight percentage, and the target content of the rare earth Ce is 0.12%;
secondly, carrying out electroslag remelting by using a quinary electroslag slag system, controlling the melting speed of the consumable electrode to be 340-360 Kg/h, blowing argon in the whole process for gas protection, continuously adding SiAlBaCa alloy particles to the surface of the slag pool according to the Al content in the consumable electrode and the total Al content of 0.05-0.08% by an automatic feeder, and carrying out diffusion deoxidation on the slag, wherein the quinary electroslag slag system comprises 40-46% of CaF (calcium fluoride) in percentage by weight2、12%CaO、12%Al2O3、10%MgO、20%~26%RExOy；
And step three, obtaining an electroslag remelting plate blank after electroslag remelting, carrying out secondary spray cooling on the electroslag remelting plate blank, carrying out hot rolling by using a rolling mill, and straightening by using a straightening machine after the hot rolling to obtain the rare earth heat-resistant steel plate.
When the Ce content in the consumable electrode is 0.10-0.12%, the slag system adopts CaF with the weight percentage of 40%2、12% CaO、12% Al2O3、10% MgO、26%RExOyWhen the Ce content in the consumable electrode is 0.125-0.135%, the slag system adopts CaF with the weight percentage of 44%2、12% CaO、12% Al2O3、10% MgO、22%RExOyWhen the Ce content in the consumable electrode is 0.14-0.15% of the lower limit level, the slag system adopts CaF with the weight percentage of 46%2、12% CaO、12% Al2O3、10% MgO、20%RExOy。
In the electroslag remelting stage, a deoxidizer SiAlBaCa alloy is adopted to carry out diffusion deoxidation on the slag, the slag is added at the early stage and the middle stage of electroslag according to the speed of 15 g/5-18 g/5min, and the slag is added at the feeding stage according to the speed of 10g/5 min.
The invention has the beneficial effects that: the surface quality of the rare earth heat-resistant steel 253MA hot rolled plate is good, and the defects of obvious heavy skin, slag inclusion and the like are avoided. According to the GB/T1979-2001 structural steel macrostructure defect rating diagram standard, the internal quality of the slabs in the examples is detected, defects such as looseness, segregation, white bright bands, subcutaneous bubbles, residual shrinkage cavities, turning, white spots, axial intercrystalline cracks, internal bubbles, non-metallic inclusions, slag inclusion, foreign metallic inclusions and the like are not found, and the internal quality of steel ingots is good.
Compared with the prior art, the invention has the beneficial effects that: by researching the rare earth burning loss rule in the smelting process, firstly, a proper smelting deoxidation process is adopted to produce a consumable electrode blank meeting the requirement of internal control components; and then based on a slab electroslag remelting technology, adopting appropriate electroslag remelting parameters such as a quinary electroslag remelting slag system, a melting speed, a deoxidation system and the like to effectively control the rare earth oxidation burning loss in an electroslag stage. The 253MA electroslag remelting plate blank of the rare earth heat-resistant steel with qualified chemical components, qualified internal and external quality, 250mm multiplied by 1250mm in section size and 6 tons in weight can be successfully produced, the plate blank can be directly fed into a rolling mill to be hot-rolled into a 1250mm multiplied by 35mm multiplied by L plate, the forging and cogging processes required by a common round ingot are omitted, the production cost is reduced by about 3000 yuan/ton, the production period of the plate is shortened, and the method has obvious economic benefit.
Detailed Description
The rare earth heat-resistant steel 253MA related by the invention comprises the following components in percentage by weight: 0.05 to 0.10 percent of C, 1.4 to 2.0 percent of Si, less than or equal to 0.8 percent of Mn, less than or equal to 0.03 percent of S, less than or equal to 0.045 percent of P, 20 to 22 percent of Cr, 10 to 12 percent of Ni, 0.03 to 0.08 percent of Ce0.03 percent of N, and 0.14 to 0.20 percent of N. The 253MA steel ingot is smelted in a mode of 'intermediate frequency induction furnace, AOD furnace and electroslag remelting', firstly an electroslag slab with qualified chemical components, surface and internal quality is produced, and then the electroslag slab directly enters a rolling mill to be hot-rolled into a plate with a specified specification.
Firstly, in the electrode smelting stage, molten steel is fully deoxidized, the burning loss of rare earth Ce is inhibited, and stable yield is obtained. Therefore, theoretical calculation is carried out on the rare earth Ce burning loss reaction by means of a thermodynamic calculation method to obtain the oxygen content in steel when the rare earth burning loss reaches the equilibrium reaction, namely the requirement of ideal deoxidation conditions in the steel. In the actual smelting process, the balance cannot be completely achieved under the influence of factors such as constantly changing temperature, components and kinetic conditions, but the calculation result can provide a basis for a deoxidation control target.
The control of the yield of the rare earth Ce is a main technical difficulty for smelting the rare earth heat-resistant steel 253 MA.
Firstly, a thermodynamic calculation method is introduced to carry out theoretical calculation on the rare earth Ce deoxidation reaction, and [ O ] in steel is solved when the rare earth Ce deoxidation reaction is balanced, so that reference is provided for controlling the rare earth yield, and the thermodynamic calculation idea is as follows:
(1) setting 253MA typical chemical components and giving Ce and Al contents;
table 1 shows typical compositions of 253MA (% by weight)
(2) Looking up the element interaction coefficient in the steel and listing a calculation formula of Ce and O activity coefficients;
TABLE 2 active interaction coefficient in molten steel (T =1600 ℃)
(3) Substituting the activity coefficients of Ce and O into the thermodynamic equation of the rare earth Ce deoxidation reaction, and solving the [ O ] in the steel when the thermodynamic reaction reaches the equilibrium.
The oxidation reaction equation of rare earth Ce in steel is as follows:
In the formula (I), the compound is shown in the specification,f [Ce]the activity coefficient of Ce is expressed as,f [O]representing the activity coefficient of O.
In the formula (I), the compound is shown in the specification,
represents the coefficient of interaction of Ce with the element i。
When T =1600 ℃, the rare earth Ce oxidation reaction reaches equilibrium:
When the equations (1) to (4) are substituted into the equation (5) for calculation, and the solution shows that when the reaction of the rare earth Ce and the O in the steel reaches the equilibrium, the [ O ] =0.0004 (4 ppm) in the steel cannot achieve the target at the current smelting level, but the deoxidation index can be set to be below 30ppm, and the yield is considered during the actual smelting.
When the 253MA electrode of the rare earth heat-resistant steel is subjected to AOD smelting, the content of the rare earth Ce in the consumable electrode needs to be controlled to be 0.10-0.15% in consideration of continuous burning loss of subsequent electroslag remelting rare earth. Firstly, pre-deoxidizing by adopting crystalline silicon, controlling the content of Si within the range of 1.5% -1.6% within the range of components by adding 2.0-2.5 Kg/t, then adding 1.0-1.5 Kg/t of Al wire for deep deoxidation, adjusting the content of Si in steel to 1.6% -1.7% and controlling [ O ] to be below 30ppm before tapping, controlling the tapping temperature to 1570-1590 ℃, firstly adding 1Kg/t of SiAlBaCa alloy (Si 35%, Ca10%, Ba10%, Al12% and the balance of Fe) for deoxidation into the steel ladle during tapping, and then adding rare earth Ce-La alloy (Ce 62% -68%, La32% -38%), 0.12% of target content of Ce, 180mm multiplied by 1170mm multiplied by L in electrode specification and 6-8 tons per unit weight into steel flow according to the yield of 60% -70%.
Secondly, in the electroslag remelting stage, a fixed slab crystallizer with the cross section size of 250mm multiplied by 1250mm is adopted, and for 253MA consumable electrode blanks with different Ce contents, in order to control the burning loss of the rare earth Ce element in the electroslag stage and obtain good inner and outer surface quality, a quinary electroslag remelting slag system of 40-46 percent CaF is adopted2、12%CaO、12%Al2O3、10%MgO、20%～26%RExOyCarrying out electroslag remelting. Wherein the CaF in the slag2The melting point, viscosity and surface tension of the slag system can be reduced; al (Al)2O3Can improve slag resistance of slag system and make slag system be electrified and heatedCaO can improve the alkalinity of the slag system, and has a desulfurization effect; MgO can reduce the viscosity of the slag, improve the fluidity of the slag, form a semi-solidified slag film on the surface of the slag and reduce gas permeation.
The electrode melting speed is controlled to be 0.6DKnot～0.65DKnotAnd blowing argon for gas protection in the whole process, continuously adding SiAlBaCa alloy particles to the surface of the slag pool according to the Al content in the consumable electrode and the total Al content of 0.05-0.08% through an automatic feeder, performing diffusion deoxidation on the slag, and inhibiting the rare earth burning loss.
Thirdly, obtaining an electroslag remelting plate blank after the electroslag remelting, and carrying out secondary spray cooling on the electroslag remelting plate blank, wherein the plate blank has the specification of 250mm multiplied by 1250mm multiplied by 2500mm and the weight of about 6 tons.
And fourthly, in the slab rolling stage, putting the electroslag remelting slab into a natural gas heating furnace, heating at 1180-1200 ℃, preserving heat for 3-4 hours, and carrying out hot rolling by using a 3500 four-roller reversible rolling mill, wherein the initial rolling temperature is 1150-1180 ℃, the final rolling temperature is 900-950 ℃, and the specification of a rolled product is 1250mm multiplied by 35mm multiplied by L.
Fifthly, straightening by adopting an eleven-roller straightener after finishing rolling, ensuring the flatness of the plate surface to be 5mm/1000mm, and performing roller way spray cooling after finishing straightening.
Example 1:
when the Ce content in the consumable electrode is in a lower limit level (0.10-0.12%), the method for producing the 253MA rare earth heat-resistant steel electroslag slab comprises the following steps:
firstly, smelting a consumable electrode by adopting a mode of an 8T medium frequency induction furnace and an 8TAOD furnace, adding crystal silicon at 2.0Kg/T for pre-deoxidation, then adding 1.0Kg/T of Al wire for deep deoxidation, adjusting Si in steel to 1.6% before tapping, controlling [ O ] to be below 30ppm, controlling the tapping temperature to be 1580 +/-10 ℃, firstly adding 1Kg/T of SiAlBaCa alloy (Si 35%, Ca10%, Ba10%, Al12% and the balance of Fe) for deoxidation in a ladle during tapping, and then adding rare earth Ce-La alloy into steel flow according to 2.8 Kg/T.
The electrode specification was 180mm × 1170mm × L, the unit weight was about 6 tons, and the electrode chemical composition met the standard requirements, as shown in Table 3 below.
TABLE 3 253MA electrode chemistry (% by weight)
Secondly, polishing the surface of the consumable electrode;
and step three, preparing slag charge. CaF is adopted as slag system2、CaO、Al2O3、MgO、RExOyThe five-element slag system comprises 40 wt%, 12 wt%, 10 wt% and 26 wt% of each component, and the slag amount is 300 kg. Separately placing the slag into an electric furnace, controlling the temperature at 800 ℃, and baking for 7 hours;
fourthly, adding the baked slag into a slagging ladle, striking an arc for slagging, wherein the slagging time is about 80 minutes, the slag temperature is controlled to be 1650-1700 ℃, the slag system is guaranteed to be melted and cleaned, and 1kg of Al particles are added into the liquid slag for pre-deoxidation 10 minutes before the slag melting furnace is stopped;
fifthly, moving the bottom water tank into the crystallizer, sealing, aligning the consumable electrode with the crystallizer, and lifting to the mouth of the crystallizer;
pouring liquid slag into a crystallizer, inserting a consumable electrode into a slag pool, covering an argon blowing protective cover, starting electroslag remelting by power transmission, setting the voltage of equipment to be 60V, setting the current to be 16KA, setting the electrode melting speed to be 340kg/h, continuously adding SiAlBaCa alloy particles into the slag pool for deoxidation in an electroslag remelting stage, wherein the adding speed in the electroslag remelting stage is 18g/5min, and the feeding stage is 10g/5 min;
and seventhly, after the electroslag remelting is finished, carrying out secondary spray cooling on the electroslag remelting plate blank, wherein the electroslag remelting plate blank is 250mm multiplied by 1250mm multiplied by 2500mm in specification and has the weight of about 6 tons.
The chemical composition analysis is carried out on the 253MA electroslag remelting plate blank of the rare earth heat-resistant steel, the results are shown in Table 4, the composition meets the standard requirement, and the Ce content in the electrode is in the lower limit level (0.10% -0.12%).
TABLE 4 shows 253MA electroslag slab chemical composition (wt%)
And eighthly, putting the electroslag remelting plate blank into a natural gas heating furnace for heating at 1180-1200 ℃, preserving heat for 3-4 hours, and carrying out hot rolling by using a 3500 four-roller reversible rolling mill at 1150-1180 ℃, the finishing temperature of 900-950 ℃, wherein the specification of a rolled finished product is 35mm multiplied by 1250mm multiplied by L.
And ninthly, straightening by using an eleven-roller straightening machine after rolling is finished, ensuring the flatness of the plate surface to be 5mm/1000mm, and performing roller way spray cooling after straightening is finished.
Example 2:
when the Ce content in the consumable electrode is in a middle-limit level (0.125% -0.135%), the method for producing the 253MA rare earth heat-resistant steel electroslag slab comprises the following steps:
firstly, smelting a consumable electrode by adopting a mode of '8T medium frequency induction furnace +8 TAOD', adding crystal silicon at 2.2Kg/T for pre-deoxidation in order to realize full deoxidation of molten steel, then adding 1.2Kg/T of Al wire for deep deoxidation, adjusting Si in steel to 1.65% before tapping, controlling [ O ] to be below 30ppm, controlling the tapping temperature to be 1580 +/-10 ℃, firstly adding 1Kg/T of SiAlBaCa alloy into a steel ladle for deoxidation during tapping, and then adding rare earth Ce-La alloy into steel flow at 2.8 Kg/T.
The electrode specification is 180mm × 1170mm × L, the single weight is about 6 tons, the chemical composition of the electrode meets the standard requirements, and as shown in the following table 5, the Ce content in the electrode is in a middle-limit level (0.125% -0.135%).
TABLE 5 253MA electrode chemistry (% by weight)
Secondly, polishing the surface of the consumable electrode;
and step three, preparing slag charge. CaF is adopted as slag system2、CaO、Al2O3、MgO、RExOyThe five-element slag system comprises 44 percent, 12 percent, 10 percent and 22 percent of each component by weight and 300kg of slag. Separately placing the slag into an electric furnace, controlling the temperature at 800 ℃, and baking for 7 hours;
fourthly, adding the baked slag into a slagging ladle, striking an arc for slagging, wherein the slagging time is about 80 minutes, the slag temperature is controlled to be 1650-1700 ℃, the slag system is guaranteed to be melted and cleaned, and 1kg of Al particles are added into the liquid slag for pre-deoxidation 10 minutes before the slag melting furnace is stopped;
fifthly, moving the bottom water tank into the crystallizer, sealing, aligning the consumable electrode with the crystallizer, and lifting to the mouth of the crystallizer;
pouring liquid slag into a crystallizer, inserting a consumable electrode into a slag pool, covering an argon blowing protective cover, starting electroslag remelting by power transmission, setting the voltage of equipment to be 60V, setting the current to be 16KA, and setting the electrode melting speed to be 350kg/h, continuously adding SiAlBaCa alloy particles into the slag pool for deoxidation in an electroslag remelting stage, wherein the adding speed in the electroslag remelting stage is 17g/5min, and the feeding stage is 10g/5 min;
and seventhly, after the electroslag remelting is finished, carrying out secondary spray cooling on the electroslag remelting plate blank, wherein the electroslag remelting plate blank is 250mm multiplied by 1250mm multiplied by 2500mm in specification and has the weight of about 6 tons.
And (3) carrying out chemical component analysis on the 253MA electroslag remelting plate blank of the rare earth heat-resistant steel, wherein the results are shown in Table 6, and the components meet the standard requirements.
TABLE 6 shows 253MA electroslag slab chemical composition (wt%)
And eighthly, putting the electroslag remelting plate blank into a natural gas heating furnace for heating at 1180-1200 ℃, preserving heat for 3-4 hours, and carrying out hot rolling by using a 3500 four-roller reversible rolling mill at 1150-1180 ℃, the finishing temperature of 900-950 ℃, wherein the specification of the rolled finished product is 1250mm multiplied by 35mm multiplied by L.
And ninthly, straightening by using an eleven-roller straightening machine after rolling is finished, ensuring the flatness of the plate surface to be 5mm/1000mm, and performing roller way spray cooling after straightening is finished.
Example 3:
when the Ce content in the consumable electrode is in an upper limit level (0.14% -0.15%), the method for producing the 253MA rare earth heat-resistant steel electroslag slab comprises the following steps:
firstly, smelting a consumable electrode by adopting a mode of '8T medium frequency induction furnace +8 TAOD', adding crystal silicon at 2.3Kg/T for pre-deoxidation in order to realize full deoxidation of molten steel, then adding 1.5Kg/T of Al wire for deep deoxidation, adjusting Si in steel to 1.65% before tapping, controlling [ O ] to be below 30ppm, controlling the tapping temperature to be 1580 +/-10 ℃, firstly adding 1Kg/T of SiAlBaCa alloy into a steel ladle for deoxidation during tapping, and then adding rare earth Ce-La alloy into steel flow at 2.8 Kg/T.
The electrode specification is 180mm × 1170mm × L, the single weight is about 6 tons, the chemical composition of the electrode meets the standard requirement, and as shown in table 7 below, the Ce content in the electrode is at the upper limit level (0.14% -0.15%).
TABLE 7 253MA electrode chemistry (% by weight)
Secondly, polishing the surface of the consumable electrode;
and step three, preparing slag charge. CaF is adopted as slag system2、CaO、Al2O3、MgO、RExOyThe five-element slag system comprises 46 percent, 12 percent, 10 percent and 20 percent of each component by weight and 300kg of slag. Separately placing the slag into an electric furnace, controlling the temperature at 800 ℃, and baking for 7 hours;
fourthly, adding the baked slag into a slagging ladle, striking an arc for slagging, wherein the slagging time is about 80 minutes, the slag temperature is controlled to be 1650-1700 ℃, the slag system is guaranteed to be melted and cleaned, and 1kg of Al particles are added into the liquid slag for pre-deoxidation 10 minutes before the slag melting furnace is stopped;
fifthly, moving the bottom water tank into the crystallizer, sealing, aligning the consumable electrode with the crystallizer, and lifting to the mouth of the crystallizer;
pouring liquid slag into a crystallizer, inserting a consumable electrode into a slag pool, covering an argon blowing protective cover, starting electroslag remelting by power transmission, setting the voltage of equipment to be 60V, setting the current to be 16KA, and setting the electrode melting speed to be 360kg/h, continuously adding SiAlBaCa alloy particles into the slag pool for deoxidation in an electroslag remelting stage, wherein the adding speed in the electroslag remelting stage is 15g/5min, and the feeding stage is 10g/5 min;
and seventhly, after the electroslag remelting is finished, carrying out secondary spray cooling on the electroslag remelting plate blank, wherein the electroslag remelting plate blank is 250mm multiplied by 1250mm multiplied by 2500mm in specification and has the weight of about 6 tons.
And (3) carrying out chemical component analysis on the 253MA electroslag remelting plate blank of the rare earth heat-resistant steel, wherein the results are shown in Table 8, and the components meet the standard requirements.
TABLE 8 shows 253MA electroslag slab chemical composition (wt%)
And eighthly, putting the electroslag remelting plate blank into a natural gas heating furnace for heating at 1180-1200 ℃, preserving heat for 3-4 hours, and carrying out hot rolling by using a 3500 four-roller reversible rolling mill at 1150-1180 ℃, the finishing temperature of 900-950 ℃, wherein the specification of a rolled finished product is 35mm multiplied by 1250mm multiplied by L.
And ninthly, straightening by using an eleven-roller straightening machine after rolling is finished, ensuring the flatness of the plate surface to be 5mm/1000mm, and performing roller way spray cooling after straightening is finished.
Claims (3)
1. A253 MA rare earth heat-resisting steel plate manufacturing approach, rare earth heat-resisting steel adopt medium frequency induction furnace and AOD stove smelt the consumable electrode first, then remelt by the electroslag, make qualified electroslag slab, finally pass the rolling mill to heat roll the electroslag slab into the board of the appointed specification, characterized by that, the said manufacturing approach is:
the method comprises the following steps: smelting a consumable electrode by adopting a medium-frequency induction furnace and an AOD furnace, controlling the content of rare earth Ce in the consumable electrode to be 0.10-0.15% during smelting, adding crystal silicon for pre-deoxidation according to 2.0-2.5 Kg/t, then adding 1.0-1.5 Kg/t of Al wire for deep deoxidation, adjusting Si in steel to be 1.6-1.7% before tapping, [ O ] is controlled to be below 30ppm, controlling the tapping temperature to be 1580 +/-10 ℃, adding 1Kg/t of SiAlBaCa alloy for deoxidation during tapping, wherein the SiAlBaCa alloy comprises 35% of Si, 10% of Ca, 10% of Ba, 12% of Al and the balance of Fe according to the weight percentage, then adding rare earth Ce-La alloy into steel flow according to the yield of 60-70%, wherein the Ce-La alloy comprises 62-68% of Ce and 32-38% of La according to the weight percentage, and the target content of the rare earth Ce is 0.12%;
step two: adopting a quinary electroslag slag system to carry out electroslag remelting, controlling the melting speed of a consumable electrode at 340-360 Kg/h, blowing argon in the whole process for gas protection, continuously adding SiAlBaCa alloy particles to the surface of a slag pool according to the Al content in the consumable electrode and the total Al content of 0.05-0.08% through an automatic feeder, and carrying out diffusion deoxidation on the slag, wherein the quinary electroslag slag system comprises 40-46% of CaF (calcium fluoride) in percentage by weight2、12%CaO、12%Al2O3、10%MgO、20%～26%RExOy；
Step three: and after the electroslag remelting is finished, obtaining an electroslag remelting plate blank, carrying out secondary spray cooling on the electroslag remelting plate blank, carrying out hot rolling by using a rolling mill, and straightening by using a straightening machine after the hot rolling to obtain the rare earth heat-resistant steel plate.
2. The method for manufacturing 253MA rare earth heatproof steel plate as claimed in claim 1, wherein: when the Ce content in the consumable electrode is 0.10-0.12%, the slag system adopts CaF with the weight percentage of 40 percent respectively2、12% CaO、12%Al2O3、10% MgO、26%RExOyWhen the Ce content in the consumable electrode is 0.125-0.135%, the slag system adopts CaF with the weight percentage of 44%2、12% CaO、12% Al2O3、10% MgO、22%RExOyWhen the Ce content in the consumable electrode is 0.14-0.15%, the slag system adopts CaF with the weight percentage of 46 percent respectively2、12% CaO、12% Al2O3、10% MgO、20%RExOy。
3. The method for manufacturing 253MA rare earth heatproof steel plate as claimed in claim 1, wherein: in the electroslag remelting stage, a deoxidizer SiAlBaCa alloy is adopted to carry out diffusion deoxidation on the slag, the slag is added at the early stage and the middle stage of electroslag according to the speed of 15 g/5-18 g/5min, and the slag is added at the feeding stage according to the speed of 10g/5 min.
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