CN111809018A - Method for improving hydrogen cracking resistance and hydrogen sulfide corrosion resistance of steel blank for 16MnHIC flange - Google Patents
Method for improving hydrogen cracking resistance and hydrogen sulfide corrosion resistance of steel blank for 16MnHIC flange 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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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
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
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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
- C21C7/04—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
-
- 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
Abstract
The invention discloses a method for improving the hydrogen cracking resistance and hydrogen sulfide corrosion resistance of a steel blank for a 16MnHIC flange, which adopts an LF + vacuum degassing/RH process route through external refining, adds pure rare earth Ce or rare earth Ce alloy in the RH refining process, carries out REMOTE treatment, modifies impurities in molten steel into rare earth impurities through rare earth, simultaneously generates fine new rare earth impurities in the molten steel, and controls the dispersion distribution of the rare earth impurities. Meanwhile, the generated inclusion particles are fine in size, distributed in a dispersed manner, lower in total inclusion amount and controllable in components so as to change the structure of steel, the cleanliness of the steel is higher, and the characteristics of adsorbing and dissolving H and fixing N of rare earth Ce are utilized, so that the low-temperature hydrogen cracking resistance and H2S corrosion resistance of the steel for the 16MnHIC flange are greatly improved.
Description
Technical Field
The invention relates to the technical field of rare earth oxide smelting, in particular to a method for improving the hydrogen cracking resistance and hydrogen sulfide corrosion resistance of a steel blank for a 16MnHIC flange.
Background
The steel for the 16MnHIC flange is generally used as important parts of large-scale engineering, such as bridges, water gates, storage tanks, power transmission line steel pipes, special lifting appliances, low-temperature oil transmission pipelines and interfaces thereof, and the like, so that the steel is required to have higher toughness and simultaneously have good low-temperature hydrogen cracking resistance and hydrogen sulfide corrosion resistance, and the low-temperature hydrogen cracking resistance and the hydrogen sulfide corrosion resistance can be achieved by improving the alloy addition amount and reducing the content of impurity elements such as P, S, H in molten steel and improving the purity of the molten steel by a common method.
In order to improve the low-temperature hydrogen cracking resistance and hydrogen sulfide corrosion resistance of the steel for the 16MnHIC flange and meet the requirements of markets and customers, according to the concept of 'Oxide Metallurgy' in academia, a rare earth Oxide Metallurgy Technology, namely RareEarth Oxide Metallurgy Technology (REMMT) Technology, is successfully developed, namely, the steel is prepared by utilizing the rare earth Metallurgy Technology: 1. the non-metallic inclusion in the rare earth modified molten steel is the rare earth inclusion, and meanwhile, fine new rare earth inclusion is generated in the molten steel, and the dispersion distribution of the rare earth inclusion is controlled. The generated impurity particles have small size, dispersion distribution and lower total amount of impurities, the components can be controlled to change the structure of steel, and the cleanliness of molten steel is higher; 2. h, N of rare earth capable of adsorbing and fixing steel grade has H dissolving capacity of 5700 times of that of iron under hydrogen at 800 ℃, so that harmful effects of H are eliminated or weakened, and the rare earth has N fixing effect, so that the toughness-brittleness transition temperature can be reduced by fixing N, and the low-temperature impact toughness is improved; 3. the rare earth has the function of inhibiting P from being adsorbed on a crystal boundary, and can be combined with low-melting-point impurity elements Pb, Sn, As and Bi to form a series of high-melting-point compounds to remove the high-melting-point compounds after slagging, so that the impurity elements enriched with the crystal boundary are reduced, the function of purifying the crystal boundary is achieved, and the harm caused by the macrosegregation of the impurity elements is reduced. In conclusion, the 16MnHIC flange steel blank produced by using the REMOM technology can completely meet the requirements of low-temperature hydrogen cracking resistance and H2S corrosion resistance.
Disclosure of Invention
The invention aims to provide a method for improving the hydrogen cracking resistance and the hydrogen sulfide corrosion resistance of a steel blank for a 16MnHIC flange, namely a Rare Earth Oxide Metallurgy (REMMT) method. The method is suitable for producing the steel blank for the 16MnHIC flange, and can be particularly applied to important parts of engineering machinery, bridges, water gates, storage tanks, transmission line steel pipes, special lifting appliances, low-temperature oil pipelines, interfaces thereof and the like.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for improving the hydrogen cracking resistance and hydrogen sulfide corrosion resistance of a steel blank for a 16MnHIC flange comprises the following steps:
1) KR desulfurization molten iron pretreatment: after pretreatment, the S content in the molten iron is less than or equal to 0.004 percent, the temperature of the molten iron is not less than 1300 ℃, and the slag is pneumatically pulled out in double ways, so that the exposed area of the molten iron is not less than 95 percent;
2) a converter smelting step: the proportion of the pretreated molten iron amount to the clean scrap steel is 5: 1-7: 1, the temperature of molten iron entering a furnace is 1300-1400 ℃, the S content in the molten iron is less than or equal to 0.04%, and active lime and high silicon dolomite are added for slagging to ensure the alkalinity of slag; top and bottom combined blowing, wherein the carbon is drawn by the converter for one time, and the C-O balance at the blowing end point is ensured; the tapping hole does not scatter during tapping, the tapping time is not less than 5 minutes, slag washing operation is carried out during tapping, impurities are fully gathered and floated, the purity of molten steel is improved, and the end point temperature of the molten steel implements the current operation standard;
3) and LF refining: white slag is manufactured and desulfurized at a station, the slagging speed is high, the retention time is more than or equal to 15 minutes, and the final slag component is controlled to be CaO/SiO2 which is 4.5: 1-7.0: 1; the diameter of a bright ring (a molten steel exposed area) does not exceed 1/3 of the diameter of a steel ladle during slag melting; the deoxidation alloying of the molten steel requires that Ca treatment and soft blowing are carried out for more than or equal to 5 minutes after refining is completed, the slag surface is kept in a slightly fluctuating state during soft blowing, and the total content of O and S is required to be not more than 20ppm when the molten steel is discharged;
4) RH refining step: the temperature of RH arrival molten steel is 1590-1620 ℃, the minimum vacuum degree of pumping is required to be no more than 4 minutes, the minimum vacuum degree can reach below 266Pa, the fluctuation rebound of the vacuum degree is no more than 100Pa in the vacuum treatment process, the flow of circulating argon is adjusted in the vacuum treatment process, the sufficient circulation of the molten steel is ensured, the rare earth Ce alloy is added in the RH vacuum treatment process, the rare earth is added, the circulation is carried out for 5 minutes, the re-pressing is carried out, the soft blowing is carried out for 5-6 minutes, the total vacuum treatment time is more than 20min, and the [ H ] in the molten steel after the vacuum breaking is no more than 1.2ppm, the [ O ] is no more;
5) and (3) continuous casting: the pulling speed is controlled to be 1.0 +/-0.1 m/min, the superheat degree of a tundish is 28-43 ℃, the nitrogen increase amount of the whole protective casting is less than or equal to 5ppm, the water gap of the tundish is closed 30 seconds before the ladle is subjected to slag discharging, the ladle is prevented from being subjected to slag discharging, and the parameters of dynamic secondary cooling water distribution, electromagnetic stirring and dynamic light pressure are calculated and executed according to a computer;
6) heating and heat preservation: the red hot steel billet enters a heat preservation pit, and the heating and heat preservation system comprises the initial temperature of 600-750 ℃, the heat preservation temperature of 350-450 ℃, the slow cooling time of 24h and the heating and heat preservation time of more than or equal to 48 h. The total heating and heat preservation time of the casting blank is more than or equal to 72 h.
Further, the end point carbon of the transfer furnace in the step 2) is controlled to be higher than 0.07%, and the steelmaking end point temperature is 1610-1650 ℃.
3. The method for improving the hydrogen cracking resistance and the hydrogen sulfide corrosion resistance of the steel blank for the 16MnHIC flange according to claim 1, wherein: and 2) adding Al for deoxidation after tapping of the transfer furnace, wherein the Al content of the molten steel is 0.030-0.060%.
Further, the Ce content in the molten steel in the step 4) is 0.0010-0.0040%.
Further, in the step 4), the calcium content in the molten steel is more than 0.0010 percent, so that rare earth calcium aluminate compounded with rare earth is generated in the molten steel refining process. The sulfur content in the molten steel is less than 0.002%, so that rare earth sulfide compounded with rare earth is generated in the steel.
Further, Al is adopted for deoxidation before the rare earth Ce alloy is added in the step 4), and the aluminum content in the molten steel before the rare earth Ce alloy is added is controlled to be between 0.030% and 0.040%.
Further, step 6) ensures that the temperature in the 16MnHIC flange blank is not lower than 350 ℃ within 72 h.
Further, the chemical composition of the 16MnHIC flange steel is 0.15-0.18% of C, 0.20-0.30% of Si, 1.20-1.30% of Mn, less than or equal to 0.008% of P, less than or equal to 0.003% of S, 0.020-0.50% of Alt, 0.0010-0.0030% of Ca0, the balance of iron and inevitable impurity elements, and the content of rare earth Ce is 0.0010-0.0040%.
Furthermore, the treated steel plate contains one or two of Ce-Al-O, Ce-O-S and Ca-Ce-O-S rare earth inclusions, the chemical composition of Al, Ce, Ca, S and O in the inclusions is more than 2% and less than 40% of Al, more than 20% and less than 70% of Ce, more than 5% and less than 15% of Ca, more than 10% and less than 40% of S, more than 2% and less than 20% of O, the number density is less than or equal to 150/mm 2, and the size of more than 80% of rare earth inclusions is less than 1 micron. The submicron-order inclusions are easy to disperse and distribute in the argon stirring process in the vacuum treatment process, meanwhile, the inclusions have high melting point and good thermal stability, and the rare earth inclusions can pin the original austenite grain boundary and inhibit the austenite grain from growing during casting and solidification, so that the low-temperature impact toughness and the corrosion resistance of the flange steel are improved.
Compared with the prior art, the invention has the beneficial technical effects that:
aiming at the special requirements of the 16MnHIC flange steel on the low-temperature hydrogen cracking resistance and H2S corrosion resistance, the invention adopts the REMOM technology, modifies inclusions in the molten steel by rare earth to be rare earth inclusions, simultaneously generates tiny new rare earth inclusions in the molten steel, and controls the dispersion distribution of the rare earth inclusions. Meanwhile, the generated inclusion particles are fine in size, distributed in a dispersed manner, lower in total inclusion amount and controllable in components so as to change the structure of steel, the cleanliness of the steel is higher, the characteristics of adsorbing and dissolving H and fixing N by rare earth Ce are utilized, and harmful gas is promoted to escape and be removed through heat preservation, on the other hand, the formation of rare earth sulfide consumes partial sulfur molecules, so that the low-temperature hydrogen cracking resistance and H2S corrosion resistance of the steel for the 16MnHIC flange are greatly improved.
Detailed Description
The present invention will be further described with reference to the following examples.
A method for improving the hydrogen cracking resistance and hydrogen sulfide corrosion resistance of a steel blank for a 16MnHIC flange by using a REMOM oxide metallurgy technology. The secondary refining adopts an LF + vacuum degassing/RH process route, pure rare earth Ce or rare earth Ce alloy is added in the RH degassing process to carry out REMOM treatment, inclusions in the molten steel are modified by rare earth to be rare earth inclusions, fine new rare earth inclusions are generated in the molten steel, and the dispersion distribution of the rare earth inclusions is controlled. Meanwhile, the generated inclusion particles are fine in size, distributed in a dispersed manner, lower in total inclusion amount and controllable in components so as to change the structure of steel, the cleanliness of the steel is higher, and the characteristics of adsorbing and dissolving H and fixing N of rare earth Ce are utilized, so that the low-temperature hydrogen cracking resistance and H2S corrosion resistance of the steel for the 16MnHIC flange are greatly improved.
The method for improving the hydrogen cracking resistance and the hydrogen sulfide corrosion resistance of the steel blank for the 16MnHIC flange by using the REMOM metallurgical technology comprises the following steps:
converter smelting step → LF refining step → RH refining step → continuous casting step → heating and heat preservation step. The method specifically comprises the following steps:
step 1: the molten iron is required to be treated by KR molten iron, the S content in the treated molten iron is less than or equal to 0.004 percent, the temperature of the molten iron is not less than 1300 ℃, slag drawing needs to be carried out twice, and the exposed area of the molten iron is more than or equal to 95 percent.
Step 2: the ratio of the converter steelmaking molten iron amount to the clean scrap steel is 5-7, the temperature of molten iron entering the converter is higher than 1300 ℃, S in the molten iron is less than or equal to 0.04%, and active lime and high silicon dolomite are added for slagging to ensure the slag alkalinity; and (3) top-bottom composite blowing, wherein the carbon is drawn by the converter for one time, the control of the end point carbon of the converter is not lower than 0.07%, the steelmaking end point temperature is 1610-1650 ℃, Al is added for deoxidation after tapping, and the Al content of the molten steel is 0.030-0.060%.
And step 3: white slag is manufactured at a station for desulfurization, the slagging speed is high, the retention time is more than or equal to 15 minutes, and the final slag component is controlled to be CaO/SiO 2: 1-7.0: 1; the diameter of a bright ring (a molten steel exposed area) does not exceed 1/3 of the diameter of a steel ladle during slag melting; the deoxidation alloying of the molten steel requires that Ca treatment is carried out for more than or equal to 5 minutes after refining is completed, the slag surface is kept in a slightly fluctuating state during the soft blowing, and the total content of O is required to be not more than 20ppm when the molten steel is discharged, the content of S is not more than 20ppm, and the temperature of the molten steel is 1595 to 1615 ℃.
And 4, step 4: RH refining: the temperature of RH arrival station molten steel is 1590-1620 ℃, the minimum vacuum degree can reach below 266Pa when the air extraction is not more than 4 minutes, the fluctuation rebound of the vacuum degree is not more than 100Pa in the vacuum treatment process, the circulation argon flow is adjusted in the vacuum treatment process, the full circulation of the molten steel is ensured, the rare earth Ce alloy is added in the RH vacuum treatment process, the rare earth is added, the pressure is restored after the rare earth is added and the circulation is carried out for 5 minutes, the soft blowing is carried out for 5-6 minutes, the total vacuum treatment time is more than 20min, and the [ H ] in the molten steel after the vacuum breaking is not more than 1.2ppm, the [ O ] is not more than 20 ppm.
After the alloy is added in the LF and RH refining, Ca lines are fed in the LF and RH refining, and the Ca content in the molten steel in the whole process is ensured to be more than or equal to 0.0010 percent. When the content of Ca is more than 0.0010 percent, calcium aluminate is easily generated, and the calcium aluminate covers oxide inclusions, which is beneficial to playing the role of rare earth oxide inclusions in steel.
And 5: the pulling speed is controlled to be 1.0 +/-0.1 m/min, the superheat degree of a tundish is 28-43 ℃, the nitrogen increasing amount of the whole protective casting is less than or equal to 5ppm, the water gap of the tundish is closed 30 seconds before the ladle is subjected to slag discharging, the ladle is prevented from being subjected to slag discharging, and the parameters of dynamic secondary cooling water distribution, electromagnetic stirring and dynamic light pressure are calculated and executed according to a computer.
Step 6: heating and heat preservation: the red hot steel billet enters a heat preservation pit, and the heating and heat preservation system comprises the initial temperature of 600-750 ℃, the heat preservation temperature of 350-450 ℃, the slow cooling time of 24h and the heating and heat preservation time of more than or equal to 48 h. The total heating and heat preservation time of the casting blank is more than or equal to 72h, the temperature gradient of the surface layer of the low casting blank strictly ensures the execution of the heating, heat preservation and slow cooling system of the 16MnHIC flange casting blank, the escape of harmful hydrogen elements is ensured, the segregation is reduced by uniform components, the internal structural stress of the uniform components is fully released, and the plastic toughness of the flange blank is improved.
The specific implementation result is as follows:
the 16MnHIC flange casting blank produced by the method is sent to a qualified third detection company for low-temperature hydrogen cracking resistance and H2S corrosion resistance detection after being forged, and the specific results are as follows:
typical results of the test: according to GB/T8650-2006 standard (A solution, acidic solution) and GB/T4157-2006 standard (method A, A solution, acidic solution), a Hydrogen Induced Cracking (HIC) test and a Hydrogen Sulfide stress (SSC-A Sulfide stress cracking) corrosion test are respectively carried out on a sample, and After a 96-hour Hydrogen Induced Cracking (HIC) test, no Hydrogen bubbling phenomenon (After no Hydrogen bubbling phenomenon) occurs on the surface of the sample, and the crack length rate (CLR crack length ratio), the crack thickness rate (CTR crack sensitivity) and the crack sensitivity rate (CSR crack sensitivity) are all zero. No cracking occurred in the specimens after 72 hours hydrogen sulfide stress (SSC-A) corrosion testing.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (9)
1. A method for improving the hydrogen cracking resistance and the hydrogen sulfide corrosion resistance of a steel blank for a 16MnHIC flange is characterized by comprising the following steps: the method comprises the following steps:
1) KR desulfurization molten iron pretreatment: after pretreatment, the S content in the molten iron is less than or equal to 0.004 percent, the temperature of the molten iron is not less than 1300 ℃, and the slag is pneumatically pulled out in double ways, so that the exposed area of the molten iron is not less than 95 percent;
2) a converter smelting step: the proportion of the pretreated molten iron amount to the clean scrap steel is 5: 1-7: 1, the temperature of molten iron entering a furnace is 1300-1400 ℃, the S content in the molten iron is less than or equal to 0.04%, and active lime and high silicon dolomite are added for slagging to ensure the alkalinity of slag; top and bottom combined blowing, wherein the carbon is drawn by the converter for one time, and the C-O balance at the blowing end point is ensured; the tapping hole does not scatter during tapping, the tapping time is not less than 5 minutes, slag washing operation is carried out during tapping, impurities are fully gathered and floated, the purity of molten steel is improved, and the end point temperature of the molten steel implements the current operation standard;
3) and LF refining: white slag is manufactured and desulfurized at a station, the slagging speed is high, the retention time is more than or equal to 15 minutes, and the final slag component is controlled to be CaO/SiO2 which is 4.5: 1-7.0: 1; the diameter of the bright ring does not exceed 1/3 of the diameter of the ladle during slagging; the deoxidation alloying of the molten steel requires that Ca treatment and soft blowing are carried out for more than or equal to 5 minutes after refining is completed, the slag surface is kept in a slightly fluctuating state during soft blowing, and the total content of O and S is required to be not more than 20ppm when the molten steel is discharged;
4) RH refining step: the temperature of RH arrival molten steel is 1590-1620 ℃, the minimum vacuum degree of pumping is required to be no more than 4 minutes, the minimum vacuum degree can reach below 266Pa, the fluctuation rebound of the vacuum degree is no more than 100Pa in the vacuum treatment process, the flow of circulating argon is adjusted in the vacuum treatment process, the sufficient circulation of the molten steel is ensured, the rare earth Ce alloy is added in the RH vacuum treatment process, the rare earth is added, the circulation is carried out for 5 minutes, the re-pressing is carried out, the soft blowing is carried out for 5-6 minutes, the total vacuum treatment time is more than 20min, and the [ H ] in the molten steel after the vacuum breaking is no more than 1.2ppm, the [ O ] is no more;
5) and (3) continuous casting: the pulling speed is controlled to be 1.0 +/-0.1 m/min, the superheat degree of a tundish is 28-43 ℃, the nitrogen increase amount of the whole protective casting is less than or equal to 5ppm, the water gap of the tundish is closed 30 seconds before the ladle is subjected to slag discharging, the ladle is prevented from being subjected to slag discharging, and the parameters of dynamic secondary cooling water distribution, electromagnetic stirring and dynamic light pressure are calculated and executed according to a computer;
6) heating and heat preservation: the red hot steel billet enters a heat preservation pit, and the heating and heat preservation system comprises the initial temperature of 600-750 ℃, the heat preservation temperature of 350-450 ℃, the slow cooling time of 24h and the heating and heat preservation time of more than or equal to 48 h. The total heating and heat preservation time of the casting blank is more than or equal to 72 h.
2. The method for improving the hydrogen cracking resistance and the hydrogen sulfide corrosion resistance of the steel blank for the 16MnHIC flange according to claim 1, wherein: and 2) controlling the end point carbon of the transfer furnace to be higher than 0.07 percent and controlling the steelmaking end point temperature to be 1610-1650 ℃.
3. The method for improving the hydrogen cracking resistance and the hydrogen sulfide corrosion resistance of the steel blank for the 16MnHIC flange according to claim 1, wherein: and 2) adding Al for deoxidation after tapping of the transfer furnace, wherein the Al content of the molten steel is 0.030-0.060%.
4. The method for improving the hydrogen cracking resistance and the hydrogen sulfide corrosion resistance of the steel blank for the 16MnHIC flange according to claim 1, wherein: the Ce content in the molten steel in the step 4) is 0.0010-0.0040%.
5. The method for improving the hydrogen cracking resistance and the hydrogen sulfide corrosion resistance of the steel blank for the 16MnHIC flange according to claim 1, wherein: in the step 4), the calcium content in the molten steel is more than 0.0010 percent, so that rare earth calcium aluminate compounded with rare earth is generated in the molten steel refining process. The sulfur content in the molten steel is less than 0.002%, so that rare earth sulfide compounded with rare earth is generated in the steel.
6. The method for improving the hydrogen cracking resistance and the hydrogen sulfide corrosion resistance of the steel blank for the 16MnHIC flange according to claim 1, wherein: and 4) before adding the rare earth Ce alloy, Al is adopted for deoxidation, and the aluminum content in the molten steel before adding the rare earth Ce alloy is controlled to be between 0.030 and 0.040 percent.
7. The method for improving the hydrogen cracking resistance and the hydrogen sulfide corrosion resistance of the steel blank for the 16MnHIC flange according to claim 1, wherein: and 6) ensuring that the temperature in the 16MnHIC flange blank is not lower than 350 ℃ within 72 h.
8. The method for improving the hydrogen cracking resistance and the hydrogen sulfide corrosion resistance of the steel blank for the 16MnHIC flange according to claim 1, wherein: the steel for the 16MnHIC flange comprises, by mass, 0.15-0.18% of C, 0.20-0.30% of Si, 1.20-1.30% of Mn, less than or equal to 0.008% of P, less than or equal to 0.003% of S, 0.020-0.50% of Alt, 0.0010-0.0030% of Ca, and the balance of Fe and inevitable impurity elements, wherein the content of Ce is 0.0010-0.0040%.
9. The method for improving the hydrogen cracking resistance and the hydrogen sulfide corrosion resistance of the steel blank for the 16MnHIC flange according to claim 1, wherein: the treated steel plate contains one or two rare earth inclusions of Ce-Al-O, Ce-O-S and Ca-Ce-O-S, the chemical composition of Al, Ce, Ca, S and O in the inclusions is that the mass percent is more than 2% and less than 40%, 20% and less than 70% of Ce, 5% and less than 15% of Ca, 10% and less than 40%, 2% and less than 20% of O, the number density is less than or equal to 150/mm 2, and the size of more than 80% of rare earth inclusions is less than 1 micron.
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| CN114774628A (en) * | 2022-04-20 | 2022-07-22 | 包头钢铁（集团）有限责任公司 | Key production method for processing steel for C-Mn low-temperature container by rare earth Ce or La microalloy |
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| CN115074624A (en) * | 2022-06-22 | 2022-09-20 | 江苏沙钢集团淮钢特钢股份有限公司 | Steel for hydrogen sulfide corrosion resistant rare earth-containing heat exchange tube and preparation method thereof |
| CN115404393A (en) * | 2022-08-09 | 2022-11-29 | 包头钢铁（集团）有限责任公司 | Production method of rare earth Ce treated 16MnHIC steel blank for flange |
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| CN114875195A (en) * | 2022-04-12 | 2022-08-09 | 包头钢铁（集团）有限责任公司 | Method for improving precision control and reducing alloy consumption |
| CN114774628A (en) * | 2022-04-20 | 2022-07-22 | 包头钢铁（集团）有限责任公司 | Key production method for processing steel for C-Mn low-temperature container by rare earth Ce or La microalloy |
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| CN115449583A (en) * | 2022-08-04 | 2022-12-09 | 包头钢铁（集团）有限责任公司 | Production method of steel blank for high-nitrogen flange |
| CN115449583B (en) * | 2022-08-04 | 2023-09-26 | 包头钢铁（集团）有限责任公司 | Production method of steel billet for high-nitrogen flange |
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Application publication date: 20201023 |