CN109161630B - Smelting method of HIC-resistant pipeline steel - Google Patents
Smelting method of HIC-resistant pipeline steel Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides a stable control process for smelting molten steel with ultralow carbon, ultralow sulfur, ultralow phosphorus and high cleanliness, wherein the molten steel contains less than or equal to 0.04 of C, less than or equal to 0.001 of S, less than or equal to 0.006 of P, 0.002-0.003 of Ca = and the ratio of acid-soluble aluminum to total aluminum is more than or equal to 0.95, so that the component control requirements of the anti-HIC pipeline steel on the ultralow carbon, the ultralow sulfur, the ultralow phosphorus and the high cleanliness are met.
Description
Technical Field
The invention belongs to the technical field of molten steel smelting production, and particularly relates to a smelting method of HIC-resistant pipeline steel.
Background
Hydrogen Induced Crack (Hydrogen Induced Crack-HIC) is caused by Hydrogen atoms generated by electrochemical corrosion of steel in a wet Hydrogen sulfide environment entering gaps in the steel. Since the elongated MnS inclusions and other elongated inclusions are easily generated with gaps from the steel matrix and hydrogen atoms are easily diffused at the interface of the strip structure, a large pressure is generated when the hydrogen atoms are aggregated and combined into hydrogen molecules, and thus cracks are formed parallel to the rolling surface in the rolling direction.
The HIC-resistant pipeline steel is designed to have the components of ultralow carbon, ultralow sulfur, ultralow phosphorus and high cleanliness, reduces the content of segregation-prone elements such as manganese and arsenic, is subjected to calcium treatment to modify inclusions, and the like, and simultaneously reduces the macrosegregation of the components and the banded structure generated by the macrosegregation of the components. Carbon is disadvantageous in anti-HIC performance, and when the carbon content exceeds 0.05%, segregation of manganese and phosphorus is accelerated, and when the carbon content is less than 0.04%, the anti-HIC performance can be remarkably improved. Research shows that when the carbon content is 0.05%, the Mn content is less than 1.3%, and the P content is less than 0.01%. The sulfur seriously deteriorates the HIC resistance, and when the sulfur content in the steel is less than 0.0012%, the HIC is obviously reduced, for example, the content of the sulfur in the steel is less than 0.0008%, and the average content is 0.00047% in X65 HIC resistance pipeline steel produced by Japanese JFE. Segregation of phosphorus and manganese easily generates a band-shaped hardened structure, and reducesAbility to resist HIC. It is considered that the HIC resistance is better when the hardness of the center segregation zone of the acid-resistant pipeline steel is below 330 HV. Calcium can play the role of long-strip MnS and strip-shaped Al2O3Modifying inclusion to form spherical CaO-Al2O3CaS and Japanese NKK propose that when T.O is less than or equal to 20ppm and S is less than or equal to 10ppm in steel, the Ca/S ratio is controlled within the range of 2-5, and the HIC resistance is good.
The method comprises the following steps of meeting the requirements of HIC-resistant pipeline steel on molten steel components, and greatly developing the research and application of a smelting process of the HIC-resistant pipeline steel, wherein Chinese patent CN103667875B adopts the technical processes of molten iron pretreatment desulfurization, converter duplex dephosphorization and decarburization, L F furnace desulfurization and RH furnace degassing, Chinese patent CN107151765B adopts the technical processes of molten iron pretreatment desulfurization, converter duplex slag dephosphorization, RH furnace decarburization and degassing and calcium treatment after L F furnace desulfurization, Chinese patent CN102719614B adopts the technical processes of molten iron pretreatment desulfurization, converter single slag dephosphorization, RH furnace decarburization and deoxidation, L F furnace desulfurization and RH furnace degassing calcium treatment, the single slag method usually needs large slag amount and deep dephosphorization, high temperature steel tapping and the like, so that the consumption of slag making materials and iron materials is high, the dephosphorization rate of the single slag method is limited, the duplex slag method causes large heat loss, the slagging, oxygen supply, the process temperature, slag pouring and other technical control difficulties are large, the duplex slag method needs to add special equipment, the arrangement of modification production line is large, the flexibility is poor, the process requirements of L F-RH are high, the slag making, the refining process control difficulty is high, the molten steel refining burden is increased, and the molten steel refining burden is increased.
Disclosure of Invention
The invention aims to provide a smelting method for smelting molten steel with ultralow carbon, ultralow sulfur, ultralow phosphorus and high cleanliness, which is characterized in that the carbon content in the final molten steel is less than or equal to 0.04, the sulfur content is less than or equal to 0.001, the phosphorus content is less than or equal to 0.006, the calcium content is between 0.002 and 0.003, and the ratio of acid-soluble aluminum to total aluminum is greater than or equal to 0.95 through the processes of molten iron pretreatment, converter top and bottom combined blowing, twice L F refining, twice vacuum treatment and staged calcium treatment.
The technical scheme of the invention is as follows:
a smelting method of HIC-resistant pipeline steel comprises the following production steps:
(1) pretreating molten iron: the molten iron comprises, by weight, C = 3.5-5.5, Si = 0.30-0.60, Mn = 0.25-0.45, S is less than or equal to 0.05, and P is less than or equal to 0.17; carrying out pretreatment desulfurization on molten iron, wherein slag skimming is clean before and after desulfurization, the sulfur content in the molten iron is less than or equal to 0.005 when the molten iron is discharged, and the temperature of the molten iron is more than or equal to 1250 ℃;
(2) converter: the converter adopts a single slag method, uses high-quality slag making materials and waste steel, and controls the sulfur content to be less than or equal to 0.010 percent during tapping;
tapping at low temperature, tapping with oxygen left, and tapping with slag stopping, wherein the tapping temperature is controlled to be 1540-1560 ℃, the carbon content in the molten steel is 0.04-0.06, the oxygen content is 0.05-0.07, and the phosphorus content is less than or equal to 0.010;
(3) the first L F refining is carried out, wherein the time of entering the station is not more than 20min after the converter tapping is controlled to L F, the molten steel is heated by power transmission after entering the station, lime, refined synthetic slag and micro-carbon ferromanganese are added when the temperature of the molten steel rises to 1540-1560 ℃, the power transmission intensity is adjusted to control the temperature of the molten steel to 1540-1560 ℃, argon bottom blowing is carried out for strong stirring for 10-20 min, soft blowing is carried out for 5-10 min, then slag is scraped and is cleaned, then lime and refined synthetic slag are added again, the molten steel is continuously heated to more than 1640 ℃, and the phosphorus content of the molten steel is not more than 0.005 when the molten steel is;
(4) RH vacuum treatment: performing RH vacuum treatment for decarburization and deoxidation, and controlling the carbon content of the molten steel to be less than or equal to 0.030 and the oxygen content to be less than or equal to 0.010 after the vacuum treatment; rapidly feeding an aluminum wire for deoxidation after vacuum breaking, wherein the wire feeding speed is 220-250 m/min, and the feeding length is 100-150 m;
(5) performing secondary L F refining, namely, performing temperature measurement and sampling when the molten steel enters a station, heating, making white slag, adjusting alloy components, controlling the white slag with the temperature of the molten steel exceeding 1640 ℃ to keep more than or equal to 12min, reducing the sulfur content to be below 0.0020, performing soft blowing for more than or equal to 12min after desulfurization, performing calcium treatment, and performing soft blowing for more than 5min after calcium treatment, controlling the temperature of the molten steel to be 1600-1640 ℃ when the molten steel leaves the station, and controlling the carbon increment of the molten steel to be less than or equal to 0.005;
(6) VD vacuum treatment: VD, vacuum stirring and degassing and further desulfurizing, keeping a high vacuum degree less than or equal to 67Pa, stirring for more than or equal to 15min by bottom blowing argon, stirring for more than or equal to 15min by soft blowing, and controlling the hydrogen content and the sulfur content in the molten steel to be less than or equal to 1.5ppm and less than or equal to 0.0010 respectively; carrying out calcium treatment after vacuum breaking, and carrying out soft blowing for 5-10 min after the calcium treatment;
(7) the continuous casting adopts full-protection casting.
Further, in the production step (1), the molten iron pretreatment adopts KR stirring method for desulfurization, magnesium desulfurizer is added, the addition amount is less than or equal to 0.50kg/t, the treatment time is less than or equal to 25min, and the temperature of the desulfurized molten iron is more than or equal to 1320 ℃.
Preferably, in the production step (2), the slagging material comprises lime, light-burned dolomite, fluorite and iron ore, the slag amount is less than or equal to 72kg/t, the final slag alkalinity is controlled to be 3.0-3.5, and FeO = 12-20.
Preferably, in the production step (3), the refined synthetic slag mainly comprises CaO = 40-50 and Al2O3=40~50、SiO2Not more than 4, MgO = 2-10, and the adding proportion of the lime and the refined synthetic slag is controlled between 2-3.
Further preferably, the refined synthetic slag in the production step (3) mainly comprises CaO =45.6 and Al2O3=43.2、SiO2=3.1、MgO= 3.3。
Preferably, in the production step (4), the RH vacuum pressure is controlled to be less than or equal to 10mbar, and the treatment time is controlled to be more than or equal to 10 min.
Preferably, in the production step (5), calcium treatment is carried out for 2-3 times, wherein each time the pure calcium line is fed for 45-75 m, and the interval time is 20-40 s.
Preferably, in the production step (6), the pure calcium wire is fed for one time for 120-160 m after the vacuum is broken.
Further, the slag skimming or slag-stopping tapping in the steps (1) to (3) requires that the thickness of a slag layer after slag skimming or slag stopping is less than or equal to 25 mm.
Further, the bottom blowing argon involved in the step (3), the step (5) and the step (6) is strongly stirred, the argon flow is 600-800L/min, and the argon flow is gradually reduced to 10L/min from 100L/min in involved soft blowing.
The process has the advantages that the process flow of KR + L D + L F + RH + L F + calcium treatment + VD + calcium treatment is adopted, namely, external refining dephosphorization and decarburization are utilized, the dephosphorization and decarburization burden of a converter is greatly reduced, the oxidability of molten steel is reduced, the molten iron ratio and the tapping temperature are reduced, the molten steel yield is improved, the service life of the converter is prolonged, the use of a strong deoxidizer is reduced, the quantity of non-metallic inclusions in steel is reduced, molten iron pre-desulfurization is selected, the increase of sulfur of the converter is controlled, white slag is produced through L F, and a VD vacuum stirring desulfurization process is adopted, the process is an ideal process for producing ultra-low sulfur medium and thick plates, the smelting of ultra-low sulfur below 0.001 percent is very easy to realize, the desulfurization burden of a L F furnace can be reduced, the adverse effect of carbon increase in the second refining process of a L F furnace is reduced, the calcium treatment after deoxidation and desulfurization is designed to feed impurities in class B, the calcium treatment is modified to control the formation of pure impurities in class B, soft blowing is fully performed before and after the calcium treatment, the calcium treatment is beneficial to reducing the quantity of the modified inclusions, the ultra-low sulfur inclusions, the quantity of molten steel, the ultra-low sulfur, the molten steel, the calcium content of the steel is controlled, the ultra-low sulfur steel is controlled, the calcium treatment, the calcium.
Detailed Description
The invention is further illustrated by the following set of examples.
A smelting method of HIC-resistant pipeline steel comprises the following production steps:
(1) pretreating molten iron: the molten iron comprises the following components, by weight, C = 3.5-5.5, Si = 0.30-0.60, Mn =0.25% -0.45, S is less than or equal to 0.05, and P is less than or equal to 0.17; performing pretreatment desulfurization on molten iron, completely removing slag before and after desulfurization, and ensuring that S in the molten iron is less than or equal to 0.005 and the temperature of the molten iron is more than or equal to 1250 ℃ when the molten iron is discharged;
(2) converter: the converter adopts a single slag method and uses high-quality slag making materials and waste steel to ensure that S is less than or equal to 0.010 during tapping; tapping at low temperature, tapping with oxygen left, and tapping with slag stopping, wherein the final tapping temperature is controlled to be 1540-1560 ℃, the carbon content in the molten steel is C = 0.04-0.06, O = 0.05-0.07, and P is less than or equal to 0.010;
(3) the first L F refining is carried out, namely, after steel is tapped from a converter, the time of entering the converter to L F is controlled to be less than or equal to 20min, the converter is powered on to heat molten steel after entering the converter, when the temperature of the molten steel rises to 1540-1560 ℃, lime, refined synthetic slag and micro-carbon ferromanganese are added to the converter for slagging, then the power transmission strength is adjusted to control the temperature of the molten steel to be 1540-1560 ℃, argon is blown at the bottom for strong stirring for 10-20 min, the molten steel is blown off for 5-10 min and then is completely scraped, then the lime and the refined synthetic slag are added again, and the molten steel is continuously heated to 1640 ℃ or higher, and the S in the;
(4) RH vacuum treatment: decarbonizing and deoxidizing by RH light treatment, and controlling the molten steel C to be less than or equal to 0.030 and the molten steel O to be less than or equal to 0.010 after vacuum treatment; rapidly feeding an aluminum wire for deoxidation after vacuum breaking, wherein the wire feeding speed is 220-250 m/min, and the feeding length is 100-150 m;
(5) performing secondary L F refining, namely, performing temperature measurement and sampling when the molten steel enters a station, heating, making white slag, adjusting alloy components, controlling the white slag with the temperature of the molten steel exceeding 1640 ℃ to keep more than or equal to 12min, reducing the sulfur content to be below 0.0020, performing soft blowing for more than or equal to 12min after desulfurization, performing calcium treatment, and performing soft blowing for more than 5min after calcium treatment, controlling the temperature of the molten steel to be 1600-1640 ℃ when the molten steel leaves the station, and controlling the carbon increment of the molten steel to be less than or equal to 0.005;
(6) VD vacuum treatment: carrying out vacuum stirring and degassing and further desulfurization by VD, keeping a high vacuum degree of less than or equal to 67Pa, keeping the strong stirring time of bottom blowing argon for more than or equal to 15min, keeping the soft blowing time for more than or equal to 15min, and controlling the H content in molten steel to be less than or equal to 1.5ppm and the S content to be less than or equal to 0.0010;
carrying out calcium treatment after vacuum breaking, and carrying out soft blowing for 5-10 min after the calcium treatment;
(7) the continuous casting adopts full-protection casting.
In the step (1), preferably, the molten iron pretreatment adopts KR stirring for desulfurization, magnesium desulfurizer is added, the addition amount is less than or equal to 0.50kg/t, the treatment time is less than or equal to 25min, and the temperature of the desulfurized molten iron is more than or equal to 1320 ℃.
In the step (2), preferably, the slagging material comprises lime, light-burned dolomite, fluorite and iron ore, the slag amount is less than or equal to 72kg/t, the final slag alkalinity is controlled to be 3.0-3.5, and FeO = 12-20.
In the step (3), preferably, the refined synthetic slag mainly comprisesComprises CaO = 40-50 and Al2O3=40~50、SiO2Not more than 4, MgO = 2-10, and the adding proportion of lime and refined synthetic slag is controlled between 2-3; more preferably, the refined synthetic slag mainly comprises CaO =45.6 and Al2O3=43.2、SiO2=3.1、MgO= 3.3。
In the step (4), preferably, the RH vacuum pressure is controlled to be less than or equal to 10mbar, and the treatment time is controlled to be more than or equal to 10 min.
In the step (5), preferably, the calcium treatment is carried out for 2-3 times, wherein the pure calcium line is fed for 45-75 m every time, and the interval time is 20-40 s.
In the step (6), preferably, the pure calcium wire is fed for one time for 120-160 m after the vacuum is broken.
Further, in the steps (1) to (3), the involved slag skimming or slag-stopping tapping requires that the thickness of a slag layer after slag skimming or slag stopping is less than or equal to 25 mm.
Further, in the step (3), the step (5) and the step (6), the involved bottom blowing argon is strongly stirred, the argon flow is 600-800L/min, and the involved soft blowing argon flow is gradually reduced to 10L/min from 100L/min.
Examples the metallurgical composition control of each production process is shown in Table 1. The specific process parameters of the smelting process are shown in Table 2.
Therefore, according to the smelting method disclosed by the invention, the ratio of acid-soluble aluminum to total aluminum is more than or equal to 0.95, and the quality requirements of HIC-resistant pipeline steel on ultralow-carbon, ultralow-sulfur, ultralow-phosphorus and high-cleanliness molten steel can be met, wherein C is less than or equal to 0.04, C is less than or equal to 0.001, P is less than or equal to 0.006, Ca = 0.002-0.003.
TABLE 1 examples control of smelting Components in production steps (in% by weight)
TABLE 2 specific process parameters of the smelting process in each example
Claims (10)
1. A smelting method of HIC-resistant pipeline steel is characterized by comprising the following production steps:
(1) pretreating molten iron: the molten iron comprises, by weight, C =3.5% -5.5%, Si =0.30% -0.60%, Mn =0.25% -0.45%, S is less than or equal to 0.05%, and P is less than or equal to 0.17%; performing pretreatment desulfurization on molten iron, and completely removing slag before and after desulfurization, wherein S in the molten iron is less than or equal to 0.005% when the molten iron is discharged, and the temperature of the molten iron is more than or equal to 1250 ℃;
(2) converter: the converter adopts a single slag method, uses high-quality slag making materials and waste steel, and controls the S to be less than or equal to 0.010 percent during tapping; tapping at low temperature, tapping with oxygen left, slag stopping and tapping, wherein the tapping temperature is controlled to be 1540-1560 ℃, C = 0.04-0.06%, O = 0.05-0.07%, and P is less than or equal to 0.010% in molten steel;
(3) the first L F refining is carried out, wherein the time of entering the station is not more than 20min after the converter tapping is controlled to L F, the molten steel is heated by power transmission after entering the station, lime, refined synthetic slag and micro-carbon ferromanganese are added when the temperature of the molten steel rises to 1540-1560 ℃, the power transmission intensity is adjusted to control the temperature of the molten steel to 1540-1560 ℃, argon bottom blowing is carried out for strong stirring for 10-20 min, soft blowing is carried out for 5-10 min, then slag is scraped and cleaned, then lime and refined synthetic slag are added again, the molten steel is continuously heated to more than 1640 ℃, and the P of the molten steel is controlled to be not more than 0.005% when the;
(4) RH vacuum treatment: performing RH vacuum treatment for decarburization and deoxidation, and controlling the content of C in molten steel to be less than or equal to 0.030 percent and the content of O to be less than or equal to 0.010 percent after the vacuum treatment; rapidly feeding an aluminum wire for deoxidation after vacuum breaking, wherein the wire feeding speed is 220-250 m/min, and the feeding length is 100-150 m;
(5) performing secondary L F refining, namely, performing temperature measurement and sampling when the molten steel enters a station, heating, making white slag, adjusting alloy components, controlling the white slag with the molten steel temperature exceeding 1640 ℃ to keep the time to be more than or equal to 12min, reducing the sulfur content to be less than or equal to 0.0020%, performing soft blowing for more than or equal to 12min after desulfurization, performing calcium treatment, performing soft blowing for more than 5min after calcium treatment, controlling the molten steel temperature to be 1600-1640 ℃ when the molten steel leaves the station, and controlling the carbon increment of the molten steel to be less than or equal to 0.005%;
(6) VD vacuum treatment: VD vacuum stirring degassing and further desulfurizing, keeping a high vacuum degree less than or equal to 67Pa, keeping the bottom blowing argon strong stirring time more than or equal to 15min, keeping the soft blowing time more than or equal to 15min, and controlling H less than or equal to 1.5ppm and S less than or equal to 0.0010 percent in molten steel; carrying out calcium treatment after vacuum breaking, and carrying out soft blowing for 5-10 min after the calcium treatment;
(7) the continuous casting adopts full-protection casting.
2. The method for smelting the HIC-resistant pipeline steel according to claim 1, wherein the method comprises the following steps: in the production step (1), the molten iron pretreatment adopts KR stirring method for desulfurization, magnesium desulfurizer is added, the addition amount is less than or equal to 0.50kg/t, the treatment time is less than or equal to 25min, and the temperature of the desulfurized molten iron is more than or equal to 1320 ℃.
3. The method for smelting the HIC-resistant pipeline steel according to claim 1, wherein the method comprises the following steps: in the production step (2), the slagging material comprises lime, light-burned dolomite, fluorite and iron ore, the slag amount is less than or equal to 72kg/t, the final slag alkalinity is controlled to be 3.0-3.5, and FeO =12% -20%.
4. The method for smelting the HIC-resistant pipeline steel according to claim 1, wherein the method comprises the following steps: in the production step (3), the refining synthetic slag mainly comprises CaO =40% -50%, and Al2O3=40%~50%、SiO2The content of the lime is less than or equal to 4%, the content of MgO is =2% -10%, and the adding proportion of the lime and the refined synthetic slag is controlled to be 2-3.
5. The method for smelting the HIC-resistant pipeline steel according to claim 4, wherein the method comprises the following steps: the refining synthetic slag mainly comprises CaO = 45.6% and Al2O3=43.2%、SiO2=3.1%、MgO= 3.3%。
6. The method for smelting the HIC-resistant pipeline steel according to claim 1, wherein the method comprises the following steps: in the production step (4), the RH vacuum pressure is controlled to be less than or equal to 10mbar, and the treatment time is controlled to be more than or equal to 10 min.
7. The method for smelting the HIC-resistant pipeline steel according to claim 1, wherein the method comprises the following steps: in the production step (5), calcium treatment is carried out for 2-3 times, pure calcium wires are fed for 45-75 m each time, and the interval time is 20-40 s.
8. The method for smelting the HIC-resistant pipeline steel according to claim 1, wherein the method comprises the following steps: in the production step (6), the pure calcium wire is fed for one time for 120-160 m after the vacuum is broken.
9. The method for smelting the HIC-resistant pipeline steel according to claim 1, wherein the method comprises the following steps: and (3) completely slagging off or slag stopping and tapping, wherein the thickness of a slag layer after slagging off or slag stopping is required to be less than or equal to 25 mm.
10. The method for smelting the HIC-resistant pipeline steel according to claim 1, wherein the bottom blowing argon is used for strong stirring in the steps (3), (5) and (6), the argon flow is 600-800L/min, and the argon flow is gradually reduced to 10L/min from 100L/min through related soft blowing.
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| CN115094190B (en) * | 2022-06-01 | 2023-08-08 | 包头钢铁（集团）有限责任公司 | Ultralow-carbon steel smelting continuous casting production process of 100-ton dry type VD furnace |
| CN115747403A (en) * | 2022-11-02 | 2023-03-07 | 包头钢铁（集团）有限责任公司 | Smelting method of high-cleanliness seamless pipe steel |
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| CN102719728B (en) * | 2012-06-18 | 2014-04-02 | 北京科技大学 | Technique for producing anti-acid pipeline steel by RH-LF-VD refining |
| CN102719614B (en) * | 2012-06-18 | 2014-01-15 | 北京科技大学 | Process for producing anti-acid pipeline steel by Ruhrstahl Heraecus (RH)-ladle furnace (LF)-RH refining |
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