CN112760550B - Production method of nickel-free copper-phosphorus weathering steel casting blank - Google Patents
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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Abstract
The invention provides a production method of a nickel-free copper-phosphorus weathering steel casting blank, which comprises the following steps: the nickel-free copper-phosphorus series weather-resistant steel casting blank comprises the following components: c: 0.05-0.10 wt%; si: 0.30-0.50 wt%; mn: 0.40-0.55 wt%; p: 0.07-0.15 wt%; s: less than or equal to 0.005 wt%; cr: 0.3-0.5 wt%; cu: 0.2-0.5 wt%; and (3) Alt: 0.020-0.050 wt%; ti: less than or equal to 0.035 wt%; ni alloy is not added; the balance of Fe and inevitable trace elements; the production method and process route of the nickel-free copper-phosphorus weathering steel casting blank sequentially comprises the following steps: the method comprises the steps of molten iron desulphurization pretreatment, converter molten steel smelting, LF furnace molten steel refining and continuous casting of a straight arc type plate blank casting machine. The invention reduces the consumption of slag-making materials and iron loss in the smelting process, improves the utilization rate of molten iron phosphorus, and solves the problems of unsmooth pouring and casting blank surface quality of the nickel-free copper phosphorus weathering steel.
Description
Technical Field
The invention relates to the field of continuous casting, in particular to a production method of a nickel-free copper-phosphorus series weather-resistant steel casting blank.
Background
In the traditional oxygen top-blown converter steelmaking, in order to remove impurities such as phosphorus, sulfur and the like in steel, a large amount of slag-making materials such as lime and the like are added to make foamed slag, a large amount of iron is oxidized to enter the slag in the oxygen blowing process, and the iron loss in the blowing process is large. The converter smelting generally consumes about 60kg of slagging materials such as steel lime, light burning and the like, the converter slag amount is over 100kg, the total iron and iron bead content in slag is generally about 30%, the iron loss in slag reaches over 30kg, and the cost of iron loss is about 70 yuan.
The molten steel of the copper-phosphorus weathering steel is easy to have surface cracks and even has the phenomenon of leakage when a plate blank is poured, and has great influence on the production sequence and the yield of the molten steel. In order to reduce the hot brittleness of copper and improve the surface quality of copper-containing steel, a certain amount of nickel alloy is added into steel in the traditional smelting process, so that higher production cost is generated. For example, Chinese patent application No. 201110087097.0 discloses a converter less slag smelting method based on copper phosphorus weathering steel, which introduces a converter less slag smelting method of CSP production process, but the production cost of the method is still not low.
In summary, the following problems exist in the prior art: the slag-making material consumption and the iron loss in the smelting process are high, the utilization rate of molten iron phosphorus is low, the production cost is high, and the problems of unsmooth pouring of the nickel-free copper phosphorus weathering steel and the surface quality of a casting blank are solved.
Disclosure of Invention
The invention provides a production method of a nickel-free copper-phosphorus weathering steel casting blank, which aims to solve the problems of high slag making material consumption and iron loss, low utilization rate of molten iron and phosphorus, high production cost, non-smooth pouring of nickel-free copper-phosphorus weathering steel and surface quality of the casting blank in the smelting process.
Therefore, the invention provides a production method of a nickel-free copper-phosphorus weathering steel casting blank, which comprises the following steps:
the nickel-free copper-phosphorus series weather-resistant steel casting blank comprises the following components: c: 0.05-0.10 wt%; si: 0.30-0.50 wt%; mn: 0.40-0.55 wt%; p: 0.07-0.15 wt%; s: less than or equal to 0.005 wt%; cr: 0.3-0.5 wt%; cu: 0.2-0.5 wt%; and (3) Alt: 0.020-0.050 wt%; ti: less than or equal to 0.035 wt%; no Ni alloy is added; the balance of Fe and inevitable trace elements;
the production method of the nickel-free copper-phosphorus series weathering steel casting blank sequentially comprises the following process routes: the method comprises the steps of molten iron desulphurization pretreatment, converter molten steel smelting, LF furnace molten steel refining and continuous casting of a straight arc type plate blank casting machine.
Further, in the smelting of the molten steel in the converter,
the loading system comprises: 150 ton converter system: charging 132-140 tons of molten iron and 15-25 tons of scrap steel;
the S content of the molten iron fed into the furnace is less than or equal to 0.040 wt%; if the molten iron S is more than 0.040wt%, the molten iron must be desulfurized, and the molten iron S is ensured to be less than or equal to 0.010wt% after desulfurization;
and if the slag is not desulfurized, the slag is not removed, and if the slag is desulfurized, the slag before removal is not removed, so that the bright surface of the slag after removal is more than 90 percent.
Further, in the smelting of the converter molten steel, the slagging system is as follows:
controlling the converter terminal alkalinity: 1.6 to 2.5; slag remaining operation is adopted, 17-19 kg of light burning and 8-10 kg of lime are added into each ton of steel; the oxygen supply intensity is controlled according to 2.1-3.6 Nm 3/min.t, and the oxygen supply mode adopts a mode of blowing once oxygen supply to finish, or a mode of blowing to finish oxygen supply when the oxygen consumption is 7-10 Nm3/t and then blowing off again.
Further, in converter molten steel smelting, the end point control target is as follows:
tapping carbon C: 0.04-0.07 wt%, tapping phosphorus P: 0.060 to 0.085 wt%, tapping temperature: 1660-1690 ℃.
Further, in the smelting of the molten steel in the converter, 2.4-3.0 kg of pre-melted slag or 1.5-1.8 kg of refining slag modifier and 600-800 kg of lime are added into a steel ladle in the tapping process;
a double-slag-blocking and deoxidation-free tapping process is adopted to reduce nitrogen increase in the tapping process; and after steel is discharged, adopting aluminum iron or aluminum wire to deoxidize.
Further, in the molten steel refining of the LF furnace, submerged arc slagging is adopted to reduce nitrogen increase of the molten steel.
Further, in molten steel refining in an LF furnace, slag control: TFe < 1.0wt%, CaO: 46-54 wt%, MgO: 4-10 wt%, SiO 2: 4-12 wt%, Al2O 3: 18-28 wt%, slag basicity R: 3.5 to 6.
Further, in the molten steel refining of the LF furnace, ferrotitanium is added after the reducing slag is produced, and the adding amount is 1.12-1.56 kg/t.
Further, in the continuous casting of the straight arc type slab casting machine, the adopted casting powder is as follows: SiO 2: 29-35%, CaO: 27-33 wt%, Al2O3 not more than 7%, F-: 4-8 wt%, Na 2O: 7-14 wt%, R (binary basicity): 0.93-0.96, melting point: 1020-1100 ℃, 1300 ℃ viscosity: 0.10 to 0.22Pa.s, and the flow rate of cooling water of the continuous casting crystallizer is 7.5 to 9 m/s.
Further, in the continuous casting of the straight arc type slab casting machine, a secondary cooling system is as follows: the specific water amount is 0.7-1.1L/kg.
Has the advantages that:
1. the converter slag remaining and less slag smelting is adopted, so that the consumption of slagging materials and iron loss are reduced, the utilization rate of phosphorus in molten iron is improved, the process is combined with a process without adding nickel alloy into steel, the quality of the cast blank is the same as that of a nickel-added copper-phosphorus weathering steel cast blank, the production cost is greatly reduced, and the cost per ton of steel is reduced by over 180 yuan compared with the conventional production process.
2. Solves the problems of the smooth pouring and the surface quality of the casting blank of the nickel-free copper-phosphorus weathering steel, and the surface crack rate of the casting blank is controlled below 0.1 percent.
3. Reduces the consumption of slagging materials, lightens the environmental pressure and meets the national requirements of energy conservation and emission reduction.
Detailed Description
The present invention will now be described in order to more clearly understand the technical features, objects, and effects of the present invention.
The invention aims to solve the problems of low utilization rate of molten iron phosphorus in the prior production of high-phosphorus steel for containers and the problems of smooth pouring and casting blank quality under the condition of not adding nickel in the steel; the converter smelting method for smelting low-carbon and high-phosphorus with less slag and remained slag is provided, the phosphorus content is stably controlled to be 0.060-0.085 wt% on the premise that the carbon content of molten steel at the end point of a converter meets the process requirement, and the consumption of slagging materials such as lime, light burning and the like is controlled to be below 40kg per ton of steel; the LF furnace molten steel refining process is provided, and the cleanliness of molten steel is further improved through reasonable slag system design; provides a pouring process of a nickel-free copper-phosphorus weathering steel continuous casting billet, which ensures that the continuous casting is smooth and the surface crack rate of the casting billet is controlled below 0.1 percent.
The technical scheme adopted by the invention is that the casting blank comprises the following components: c: 0.05-0.10 wt%; si: 0.30-0.50 wt%; mn: 0.40-0.55 wt%; p: 0.07-0.15 wt%; s: less than or equal to 0.005 wt%; cr: 0.3-0.5 wt%; cu: 0.2-0.5 wt%; and (3) Alt: 0.020-0.050 wt%; ti: less than or equal to 0.035 wt%; no Ni alloy is added; the balance of Fe and inevitable trace elements.
The invention relates to a production method of a nickel-free copper-phosphorus series weathering steel casting blank, which comprises the following process routes: the method comprises the steps of molten iron desulphurization pretreatment, converter molten steel smelting, LF furnace molten steel refining, continuous casting of a straight arc type slab casting machine, inspection, cleaning and hot rolling factory.
The main production process comprises the following steps:
1. smelting in a converter
(1) A loading system comprises the following steps:
150 ton converter system: the molten iron (132-140 tons) and the scrap steel (15-25 tons).
The S content of the molten iron fed into the furnace is less than or equal to 0.040 wt%; if the molten iron S is more than 0.040wt%, the molten iron must be desulfurized, and the molten iron S is ensured to be less than or equal to 0.010wt% after desulfurization. And if the slag is not desulfurized, the slag is not removed, and if the slag is desulfurized, the slag before removal is not removed, so that the bright surface of the slag after removal is more than 90 percent. The scrap steel adopts common scrap steel and copper plates.
(2) Argon is blown from the bottom of the converter in the whole smelting process.
(3) Slagging: controlling the converter terminal alkalinity: 1.6-2.5; the method for calculating the amount of the remaining slag comprises the following steps: according to the content of molten iron P, the content of scrap steel P, the molten iron loading amount, the scrap steel loading amount and the new slag loading amount of the furnace time, the residual slag amount, the new slag loading amount, the content of molten iron P, the content of scrap steel P and the molten iron loading amount of each furnace time before the furnace time are started to circulate from the furnace time to the previous furnace timeAnd carrying out P load balance iterative cycle calculation on the charging amount of the scrap steel, measuring and calculating the final slag P load of the furnace, and carrying out total P balance budget on the slag remaining amount of the furnace according to the final slag P load and the conditions of the standard molten iron and the scrap steel. Adding 17-19 kg of light burning and 8-10 kg of lime into each ton of steel; the oxygen supply intensity is 2.1-3.6 Nm3Controlling the temperature in a min-t mode, wherein the oxygen supply mode adopts one-time oxygen supply blowing to an ending mode, or blowing until the oxygen consumption is 7-10 Nm3A mode in which oxygen supply is terminated at/t and then lance blowing is performed again.
(4) End point control target:
tapping carbon (C): 0.04-0.07 wt%, tapping phosphorus (P): 0.060 to 0.085 wt%, tapping temperature: 1660-1690 ℃.
(5) Tapping, deoxidizing and alloying:
firstly, in order to obtain a better slag jacking effect of the steel ladle, the following measures are taken: in the tapping process, 2.4-3.0 kg of pre-dissolved slag or 1.5-1.8 kg of refining slag modifier and 600-800 kg of lime are added into a ladle per ton of steel.
Secondly, a double-slag-blocking and deoxidation-free tapping process is adopted to reduce nitrogen increase in the tapping process; and after steel is discharged, adopting aluminum iron or aluminum wire to deoxidize.
Alloying control: and in the tapping process, medium carbon ferromanganese, medium carbon ferrochromium and ferrophosphorus are added according to the end point component condition for alloying.
(6) And (3) a furnace back argon blowing system: the argon blowing time and argon flow are strictly controlled to avoid nitrogen increase in the process.
2. LF furnace refining process
The process control key points are as follows: deoxidizing, desulfurizing, removing impurities, effectively improving the cleanliness of molten steel, and finely adjusting the components of the molten steel.
The process control is mainly as follows: submerged arc slagging is adopted, and LF refining process protection is enhanced, so that nitrogen increase of molten steel is reduced.
(1) Controlling the slag: TFe < 1.0wt%, CaO: 46-54 wt%, MgO: 4 to 10wt% of SiO2：4～12wt％、Al2O3: 18-28 wt%, slag basicity R: 3.5 to 6.
(2) Adding ferrotitanium after the reducing slag is produced, wherein the adding amount is 1.12-1.56 kg/t; and finely adjusting the molten steel composition.
(3) Calcium treatment: feeding 1.4-2.8 m of silicon calcium wire or 0.85-1.7 m of pure calcium wire per ton of steel, and controlling the feeding rate at 2.5-4.0 m/s.
(4) After calcium treatment, the soft argon blowing time of the molten steel is ensured to be more than or equal to 8 min; and adding a ladle covering agent before the molten steel is discharged out of the station to protect the molten steel.
3. Slab continuous casting process
The straight-arc slab continuous casting machine adopts a whole-course protection casting process, a large ladle needs to be covered for protection, tundish molten steel cannot be exposed, and a protective sleeve device and argon sealing are ensured to be good.
(1) Selecting the covering slag:
the nickel-free copper-phosphorus series weathering steel crystallizer covering slag is used, and the indexes of the covering slag are shown in table 1:
TABLE 1 chemical composition (%) and physical Properties
In order to prevent bleed-out or cracks from being generated during slab casting, the flow speed of cooling water of the continuous casting crystallizer is 7.5-9 m/s.
(2) A secondary cooling system: the specific water amount is 0.7-1.1L/kg.
(3) The temperature of the middle package is controlled to be 1529-1543 ℃, and the pulling speed is controlled to be 1.20-1.45 m/min.
Example 1: 137 tons of molten iron, 21 tons of scrap steel and control of the terminal alkalinity of the converter: 2.32; adding 20.6kg of light burning and 9.5kg of lime into per ton of steel, and controlling the oxygen supply intensity according to 2.2-3.3 Nm3Min.t, blowing by primary oxygen supply to the end point; end tapping carbon (C): 0.06 wt%, tapping phosphorus (P): 0.072 wt%, tapping temperature: 1679 ℃, controlling the flow rate of cooling water of the continuous casting crystallizer, controlling the flow rate of the cooling water to be 8.6m/s, controlling the secondary cooling specific water amount to be 1.02L/kg, and controlling the temperature of the tundish to be 1531-1537 ℃; and (3) casting the section of the machine: 1350mm, the pulling speed is controlled to be 1.35-1.40 m/min, no crack exists on the surface of the produced casting blank, and the internal and external quality of the casting blank is normal.
Example 2: 140 tons of molten iron, 19 tons of scrap steel and control of the terminal alkalinity of the converter: 2.21; adding 19.2kg of light burning and 8.5kg of lime into each ton of steel, and controlling the oxygen supply intensity according to 2.3-3.1 Nm3Min.t, blowing by primary oxygen supply to the end point; end tapping carbon (C): 0.051 wt%, tapping phosphorus (P): 0.068 wt%, tapping temperature: the temperature of 1673 ℃, the flow rate of cooling water of the continuous casting crystallizer is controlled, the flow rate of the cooling water is controlled to be 8.6m/s, the secondary cooling specific water amount is 0.88L/kg, and the temperature of a tundish is controlled to be 1532-1539 ℃; and (3) casting the section of the machine: 1350mm, the pulling speed is controlled to be 1.40m/min, no crack exists on the surface of the produced casting blank, and the internal and external quality of the casting blank is normal.
Example 3: 135 tons of molten iron, 23 tons of scrap steel and control of the terminal alkalinity of the converter: 1.82; adding 19.3kg of light burning and 9.2kg of lime into each ton of steel, and adjusting the oxygen supply intensity to 2.6-3.5 Nm3Min.t, blowing by primary oxygen supply to the end point; end tapping carbon (C): 0.07wt%, tapping phosphorus (P): 0.080wt%, tapping temperature: 1663 ℃, controlling the flow rate of cooling water of the continuous casting crystallizer, controlling the flow rate of the cooling water to be 7.7m/s, controlling the secondary cooling specific water amount to be 0.73L/kg, and controlling the temperature of the tundish to be 1533-1542 ℃; and (3) casting the section of the machine: 1210mm, the drawing speed is controlled to be 1.40-1.45 m/min, no crack exists on the surface of the produced casting blank, and the internal and external quality of the casting blank is normal.
The technical characteristics of the embodiment of the invention are as follows:
1. adopts a blowing mode of slag remaining and less slag, and stably improves the phosphorus content of the converter tapping.
2. The LF furnace molten steel refining process is provided, and the cleanliness of molten steel is further improved through reasonable slag system design.
3. The casting powder of the nickel-free copper-phosphorus weathering steel crystallizer and the casting cooling process are used, so that the continuous casting is smooth, and the surface crack rate of the casting blank is controlled to be below 0.1 percent.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it is intended that all equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention shall fall within the protection scope of the present invention.
Claims (5)
1. A production method of a nickel-free copper-phosphorus weathering steel casting blank is characterized by comprising the following steps of:
the nickel-free copper-phosphorus series weather-resistant steel casting blank comprises the following components: c: 0.05-0.10 wt%; si: 0.30-0.50 wt%; mn: 0.40-0.55 wt%; p: 0.07-0.15 wt%; s: less than or equal to 0.005 wt%; cr: 0.3-0.5 wt%; cu: 0.2-0.5 wt%; and (3) Alt: 0.020-0.050 wt%; ti: less than or equal to 0.035 wt%; no Ni alloy is added; the balance of Fe and inevitable trace elements;
the production method and process route of the nickel-free copper-phosphorus weathering steel casting blank sequentially comprises the following steps: the method comprises the following steps of molten iron desulphurization pretreatment, converter molten steel smelting, LF furnace molten steel refining and continuous casting of a straight arc type plate blank casting machine;
in the smelting of converter molten steel, 2.4-3.0 kg of pre-dissolved slag or 1.5-1.8 kg of refining slag modifier and 600-800 kg of lime are added into a steel ladle in the tapping process;
a double-slag-blocking and deoxidation-free tapping process is adopted to reduce nitrogen increase in the tapping process; deoxidizing by adopting aluminum iron or aluminum wires after steel discharging;
in the continuous casting of the straight arc type plate blank casting machine, the adopted casting powder is as follows: SiO22：29～35%wt%，CaO：27～33wt%，Al2O3≤7%，F-：4～8wt%，Na2O: 7-14 wt%, R: 0.93-0.96, melting point: 1020-1100 ℃, 1300 ℃ viscosity: 0.10 to 0.22Pa.s, and the flow rate of cooling water of the continuous casting crystallizer is 7.5 to 9 m/s;
in the smelting of the converter molten steel, the charging system is as follows: the scrap steel adopts common scrap steel and copper plates;
the loading system comprises: in a 150-ton converter system, 135 tons of molten iron and 23 tons of scrap steel are subjected to converter end point alkalinity control: 1.82; adding 19.3kg of light burning and 9.2kg of lime into each ton of steel, and adjusting the oxygen supply intensity to 2.6-3.5 Nm3Min.t, blowing by primary oxygen supply to the end point; end point tapping carbon C: 0.07wt%, tapping phosphorus P: 0.080wt%, tapping temperature: 1663 ℃, controlling the flow rate of cooling water of the continuous casting crystallizer, controlling the flow rate of the cooling water to be 7.7m/s, controlling the secondary cooling specific water amount to be 0.73L/kg, and controlling the temperature of the tundish to be 1533-1542 ℃; and (3) casting the section of the machine: 1210mm, and the pulling speed is controlled to be 1.40-1.45 m/min;
the casting powder of the nickel-free copper-phosphorus weathering steel crystallizer and the casting cooling process are used, so that the continuous casting is smooth, and the surface crack rate of the casting blank is controlled to be below 0.1 percent.
2. The method for producing a cast slab of nickel-free Cu-P based weathering steel according to claim 1, wherein in the converter molten steel smelting,
the S content of the molten iron fed into the furnace is less than or equal to 0.040 wt%; if the molten iron S is more than 0.040wt%, the molten iron must be desulfurized, and the molten iron S is ensured to be less than or equal to 0.010wt% after desulfurization;
and if the slag is not desulfurized, the slag is not removed, and if the slag is desulfurized, the slag before removal is not removed, so that the bright surface of the slag after removal is more than 90 percent.
3. The method for producing the cast slab of nickel-free copper-phosphorus weathering steel as claimed in claim 1, wherein submerged arc slagging is used in refining of molten steel in the LF furnace to reduce nitrogen increase in the molten steel.
4. The method for producing the cast slab of nickel-free copper-phosphorus weathering steel according to claim 1, wherein in the refining of the molten steel in the LF furnace, the slag control: TFe < 1.0wt%, CaO: 46-54 wt%, MgO: 4 to 10wt% of SiO2：4～12wt%、Al2O3: 18-28 wt%, slag basicity R: 3.5 to 6.
5. The method for producing the cast slab of nickel-free copper-phosphorus weathering steel according to claim 1, wherein ferrotitanium is added in an amount of 1.12 to 1.56kg/t after the completion of the production of the reducing slag in the refining of the molten steel in the LF furnace.
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| CN114058927B (en) * | 2021-10-22 | 2022-06-07 | 江苏沙钢集团淮钢特钢股份有限公司 | Production method of high-phosphorus peritectic steel |
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| CN114480972A (en) * | 2022-01-27 | 2022-05-13 | 马鞍山钢铁股份有限公司 | Thin-specification Ni-free weathering steel produced based on CSP process and production method thereof |
| CN114959455B (en) * | 2022-04-29 | 2024-02-02 | 天津钢铁集团有限公司 | High-nitrogen high-strength weather-resistant steel slab and production method thereof |
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| JPH04120214A (en) * | 1990-09-07 | 1992-04-21 | Kobe Steel Ltd | Manufacture of high p type weather resistant steel sheet small in acoustic anisotropy and having high toughness |
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| CN103436654A (en) * | 2013-08-16 | 2013-12-11 | 柳州钢铁股份有限公司 | Low-cost production method for container steel casting blanks |
| CN108660383B (en) * | 2017-03-30 | 2020-05-19 | 宝山钢铁股份有限公司 | Nickel-free economical low-temperature steel, steel pipe and steel plate suitable for being at-100 ℃ and manufacturing method thereof |
| CN108251737B (en) * | 2018-02-23 | 2019-12-17 | 柳州钢铁股份有限公司 | Manufacturing method of high-strength weathering steel with yield strength of 550MPa |
| CN108994268A (en) * | 2018-09-03 | 2018-12-14 | 本钢板材股份有限公司 | A kind of 550MPa grades of hot rolling container weathering steel and its manufacturing method |
| CN109234617A (en) * | 2018-09-12 | 2019-01-18 | 河钢股份有限公司承德分公司 | A kind of no nickel hot rolling thin gauge weathering steel volume and its production method |
| CN109825767A (en) * | 2019-02-28 | 2019-05-31 | 日照钢铁控股集团有限公司 | It is a kind of based on ESP thin slab continuous casting and rolling production 400MPa grade cupric without nickel container plate and its production method |
| CN110055375A (en) * | 2019-04-23 | 2019-07-26 | 南京钢铁股份有限公司 | A kind of Ultra-low carbon ultralow-sulfur steel smelting process |
| CN110724881B (en) * | 2019-10-13 | 2021-07-09 | 唐山钢铁集团高强汽车板有限公司 | Production method for 600MPa peritectic high-aluminum TRIP steel |
| CN110923403B (en) * | 2019-11-15 | 2021-04-27 | 柳州钢铁股份有限公司 | Control method for improving P center segregation of weathering steel |
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