CN115449583B - Production method of steel billet for high-nitrogen flange - Google Patents
Production method of steel billet for high-nitrogen flange Download PDFInfo
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- CN115449583B CN115449583B CN202210932268.3A CN202210932268A CN115449583B CN 115449583 B CN115449583 B CN 115449583B CN 202210932268 A CN202210932268 A CN 202210932268A CN 115449583 B CN115449583 B CN 115449583B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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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
- C21C7/072—Treatment with gases
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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 discloses a production method of a steel billet for a high-nitrogen flange, which successfully develops the production method of the steel billet for the high-nitrogen flange by utilizing a nitrogen increasing and controlling technology of the whole smelting process according to the smelting process characteristics of flange steel, namely, the nitrogen content is provided for molten steel through bottom blowing nitrogen in the whole process of a converter, nitrogen stirring in the bottom blowing process of LF refining, nitrogen circulation is adopted for RH, nitrogen content component fine adjustment is carried out by adding nitrogen alloy such as vanadium nitrogen, silicon manganese nitride and the like in RH vacuum refining, and the overflow amount of nitrogen is controlled by adopting heating, heat preservation and slow cooling for casting blanks of a casting machine, so that the accurate control of the nitrogen content of the steel billet for the high-nitrogen flange is realized, and the industrial production of the high-quality high-nitrogen flange steel is realized. The production method of the steel billet for the high-nitrogen flange can realize the industrial production of the steel billet for the high-quality high-nitrogen flange, and completely meets the requirements of markets and clients.
Description
Technical Field
The invention relates to the technical field of steelmaking, in particular to a production method of a steel billet for a high-nitrogen flange, which is suitable for the production of the steel billet for the high-nitrogen flange and can be particularly applied to important parts such as large-scale engineering machinery, a sluice, a storage tank, a special lifting appliance and an interface thereof.
Background
The steel for the high-nitrogen flange is generally used as important parts of large-scale engineering, such as a sluice, a storage tank, a special lifting appliance, a heat-resistant oil pipeline, an interface of the heat-resistant oil pipeline and the like, so that the steel is required to have higher toughness, and has good heat resistance and corrosion resistance.
In order to realize the industrial production of high-quality high-nitrogen flange and meet the requirements of markets and customers, a production method of a steel billet for the high-nitrogen flange is successfully developed by utilizing a nitrogen increasing and controlling technology of the whole smelting process according to the characteristics of the conventional flange steel smelting process, namely, the nitrogen content is provided for molten steel through bottom blowing nitrogen in the whole process of a converter, nitrogen stirring is carried out in the LF refining process, nitrogen circulation is adopted for RH, nitrogen content components are finely adjusted by adding nitrogen alloy such as vanadium nitrogen, silicon manganese nitride and the like in RH vacuum refining, the overflow amount of nitrogen is controlled by adopting heating, heat preservation and slow cooling for casting blanks of a casting machine, the accurate control of the nitrogen content of the steel billet for the high-nitrogen flange is realized, and the industrial production of the high-quality high-nitrogen flange steel is realized. In summary, the method for producing the steel billet for the high-nitrogen flange can realize the industrial production of the steel billet for the high-quality high-nitrogen flange, and completely meet the requirements of markets and clients.
Disclosure of Invention
The invention aims to provide a production method of a steel billet for a high-nitrogen flange, which realizes the accurate control of the nitrogen content of the steel billet for the high-nitrogen flange and realizes the industrial production of high-quality high-nitrogen flange steel.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses a production method of a steel billet for a high-nitrogen flange, which comprises the following steps of:
1) A converter smelting step: the ratio of the pretreated molten iron to the clean scrap steel is 5:1 to 7:1, charging molten iron at 1300-1400 ℃, wherein the S content in the molten iron is less than or equal to 0.04%, and active lime and high-silicon dolomite are added to ensure the slag alkalinity; top and bottom combined convertingThe bottom blowing adopts a whole-process nitrogen blowing mode, and the nitrogen supply intensity is 0.05m 3 /min﹒t～0.07m 3 And (t) carrying out slag washing operation in the tapping process, wherein the nitrogen supply pressure of ladle bottom blowing is 1.2Mpa, the flow is controlled to 300-500.0Nl/min, the impurities are ensured to be fully gathered and float upwards after deoxidation, the purity of molten steel is improved, the end temperature of the molten steel is subjected to the current operation standard, and the final off-site nitrogen content of the converter is controlled to 40+/-5 ppm;
2) LF refining: station white slag desulfurization adopts bottom blowing nitrogen in the whole process, the nitrogen supply pressure in the treatment process is 1.2Mpa, the flow is controlled at 500.0Nl/min, the slag forming speed is high, the holding time is more than or equal to 15 minutes, and the final slag component is controlled to be CaO/SiO2=4.5: 1 to 7.0:1, a step of; the diameter of a bright ring is not more than 1/3 of the diameter of a ladle during slag melting; after deoxidization alloying of molten steel is completed, adopting nitrogen supply pressure of 1.2Mpa, controlling flow rate to be 100.0Nl/min, carrying out soft blowing for more than or equal to 5 minutes, keeping the slag surface in a slightly fluctuating state during soft blowing, and controlling nitrogen content in steel at 60+/-5 ppm during discharging;
3) RH refining: the RH whole process adopts nitrogen circulation, the nitrogen pressure is 1.2Mpa, the circulation is 1500L/min, RH vacuum pumping treatment is carried out for 20min, the vacuum degree is controlled below 266Pa in the first 5min, the method is mainly used for adjusting the nitrogen content of vanadium-nitrogen alloy and silicon-manganese nitride alloying, the nitrogen content in steel is added to a target value, the specific vanadium-nitrogen alloy brands are FeV45N10, feV55N11 or FeV65N13, and the specific silicon-manganese nitride alloy comprises the following chemical components in percentage by mass: c is less than or equal to 0.25 percent, si is 40-45 percent, mn is 10-15 percent, P is less than or equal to 0.03 percent, S is less than or equal to 0.02 percent, N is 25-30 percent, and Fe is less than or equal to 15 percent; the light treatment is adopted in the last 15 minutes, the vacuum degree is controlled to be 5kPa, the vacuum degree is used for controlling the cleanliness of molten steel and finely adjusting the molten steel according to the nitrogen content in the molten steel, the nitrogen supply pressure is 1.2Mpa after the calcium-restoring treatment, the flow is controlled to be 100.0Nl/min for carrying out soft blowing, the soft blowing time is more than or equal to 10 minutes, the [ H ] in the molten steel is less than or equal to 2ppm, the [ O ] is less than or equal to 30ppm, and the target value is less than or equal to the upper limit value of [ N ] when the molten steel leaves the position;
4) And (3) continuous casting: in the casting process of the high-nitrogen flange, the solubility of nitrogen in steel is reduced along with the reduction of the temperature, and the crack rate of a billet for the high-nitrogen flange in a factory is reduced to less than 1% by adopting the crystallizer casting powder special for the high-nitrogen flange steel at a constant pulling rate;
5) Heating and preserving heat: putting the red hot steel billet into a heat preservation pit, and heating and preserving the heat for more than or equal to 48 hours according to a formulated heating and preserving system, wherein the initial temperature is 600-750 ℃, the preserving temperature is 350-450 ℃, and the slow cooling time is 24 hours; the total heating and heat preserving time of the casting blank is more than or equal to 72 hours, the temperature gradient of the surface layer of the casting blank is reduced, the execution of a heating, heat preserving and slow cooling system of the high-nitrogen flange casting blank is strictly ensured, the escape of nitrogen elements is reduced, meanwhile, the segregation is reduced by uniform components, the internal stress of the structure is fully released, and the plastic toughness of the high-nitrogen flange casting blank is improved.
Further, in the step 2), the terminal carbon of the transfer furnace is controlled to be higher than 0.05 percent, and the steelmaking terminal temperature is 1610-1650 ℃.
Further, al is added for deoxidization after tapping in the transfer furnace in the step 2), and the Al content of molten steel is 0.030-0.060%.
Further, the step 5) ensures that the temperature in the steel billet for the high-nitrogen flange is not lower than 350 ℃ in 72 hours.
Further, the crystallizer casting powder special for the high-nitrogen flange steel mainly comprises the following components in percentage by mass: siO (SiO) 2 :30.42％，Al 2 O 3 ：6.20％，CaO：33.96％，F - ：5.30％，Na 2 O:8.76%; cf:3.67%, melting point 1150 ℃,1300 ℃ viscosity 0.288Pa s.
Compared with the prior art, the invention has the beneficial technical effects that:
according to the characteristics of the flange steel smelting flow, the invention successfully develops a production method of the steel billet for the high-nitrogen flange by utilizing the nitrogen increasing and controlling technology of the whole smelting flow, namely, the nitrogen is fully blown by a converter, the nitrogen is blown by LF refining, the nitrogen is stirred at the bottom, RH adopts nitrogen circulation to provide basic nitrogen content for molten steel, nitrogen content components are finely adjusted by adding nitrogen alloys such as vanadium nitrogen, silicon manganese nitride and the like in RH vacuum refining, and the overflow amount of nitrogen is controlled by adopting heating, heat preservation and slow cooling on a casting blank of a casting machine, so that the accurate control of the nitrogen content of the steel billet for the high-nitrogen flange is realized, and the industrial production of the high-quality high-nitrogen flange steel is realized. In summary, the method for producing the steel billet for the high-nitrogen flange can realize the industrial production of the steel billet for the high-quality high-nitrogen flange, and completely meet the requirements of markets and clients.
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 is a graph showing typical values of the effect of the converter bottom blowing nitrogen intensity on endpoint [ N ];
FIG. 2 is a vanadium nitrogen alloy brand and chemical composition;
FIG. 3 shows the chemical composition of silicon manganese nitride
FIG. 4 chemical composition and physical properties of mold flux for high nitrogen flange steel;
FIG. 5 shows typical values of nitrogen content in the whole process according to the present invention.
Detailed Description
The invention is further illustrated below with reference to examples.
The invention discloses a production method of a steel billet for a high-nitrogen flange, which successfully develops a full-flow nitrogen increasing and controlling technology of smelting. The nitrogen content of the steel billet for the high-nitrogen flange is accurately controlled by adopting the heating, heat-preserving and slow-cooling control of the nitrogen overflow amount of a casting blank of a casting machine, and the industrial production of the high-quality high-nitrogen flange steel is realized.
The invention realizes the industrial production of the steel billet for the high-nitrogen flange by using the full-flow nitrogen increasing and controlling technology of smelting, and the specific method is as follows:
converter smelting step, LF refining step, RH refining step, continuous casting step and heating and heat preserving step. The method comprises the following steps:
step 1: the ratio of the pretreated molten iron to the clean scrap steel is 5:1 to 7:1, charging molten iron at 1300-1400 ℃, wherein the S content in the molten iron is less than or equal to 0.04%, and active lime and high-silicon dolomite are added to ensure the slag alkalinity; top-bottom combined blowing, bottom blowing adopts a whole-process nitrogen blowing mode, the nitrogen supply intensity is between 0.05m < 3 >/min and t and 0.07m < 3 >/min and t, slag washing operation is carried out in the tapping process, the full aggregation and floating of inclusions are ensured, the purity of molten steel is improved, the current operation standard is executed at the end temperature of the molten steel, and finally
The nitrogen content of the converter ex-situ is controlled to be 40+/-5 ppm, and typical values of the influence of the nitrogen blowing intensity at the bottom of the converter on the endpoint [ N ] are shown in figure 1.
Step 2: station white slag desulfurization adopts bottom blowing nitrogen in the whole process, the nitrogen supply pressure in the treatment process is 1.2Mpa, the flow is controlled at 500.0Nl/min, the slag forming speed is high, the holding time is more than or equal to 15 minutes, and the final slag component is controlled to be CaO/SiO2=4.5: 1 to 7.0:1, a step of; the diameter of a bright ring (a molten steel exposed area) is not more than 1/3 of the diameter of a ladle during slag melting; after the deoxidation alloying of the molten steel is finished, the nitrogen supply pressure is 1.2Mpa, the flow is controlled to be 100.0Nl/min, the soft blowing is carried out for more than or equal to 5 minutes, the slag surface is kept in a slightly fluctuating state during the soft blowing, and the nitrogen content in the steel is controlled to be 60+/-5 ppm during the discharging.
Step 3: RH refining: the RH whole process adopts nitrogen circulation, the nitrogen pressure is 1.2Mpa, the circulation is 1500L/min, RH vacuum treatment is carried out for 20min, the vacuum degree is controlled below 266Pa in the first 5min, the method is mainly used for adjusting the nitrogen content of vanadium-nitrogen alloy and silicon-manganese nitride alloy, the nitrogen content in steel is added to a target value, the specific vanadium-nitrogen and silicon-manganese nitride alloy standards are shown in fig. 2 and 3, light treatment is adopted in the last 15 min, the vacuum degree is controlled to 5kPa, the method is used for controlling the cleanliness of molten steel and finely adjusting the molten steel according to the nitrogen content in the molten steel, the nitrogen supply pressure is 1.2Mpa after calcium-re-compression treatment, the flow is controlled to 100.0Nl/min, the soft blowing time is more than 10min, the [ H ] < 2ppm, [ O ] < 30ppm, and the target value < [ N ] < upper limit value in molten steel when leaving the position.
Step 4: in the casting process of the high-nitrogen flange, the solubility of nitrogen in steel is reduced along with the reduction of the temperature, a nitrogen in steel overflows in a gas form to cause generation of subcutaneous cracks, b nitrogen in steel is precipitated in a grain boundary in a nitride form to cause generation of cracks on the surface of a casting blank, in order to reduce the incidence rate of cracks of the steel for the high-nitrogen flange, I jointly develop crystallizer casting powder special for the high-nitrogen flange steel with a casting powder manufacturer, and specific parameters are shown in figure 4, and the crack rate of the steel blank for the high-nitrogen flange in I's plant using the high-nitrogen flange casting powder at a constant pulling rate is reduced to less than 1%.
Step 5: the red hot steel billet enters a heat preservation pit, and the heating and heat preservation time is more than or equal to 48 hours according to a formulated heating and heat preservation system, wherein the initial temperature is 600-750 ℃, the heat preservation temperature is 350-450 ℃, and the slow cooling time is 24 hours. The total heating and heat preserving time of the casting blank is more than or equal to 72 hours, the temperature gradient of the surface layer of the casting blank is reduced, the execution of a heating, heat preserving and slow cooling system of the high-nitrogen flange casting blank is strictly ensured, the escape of nitrogen elements is reduced, meanwhile, the segregation is reduced by uniform components, the internal stress of the structure is fully released, and the plastic toughness of the high-nitrogen flange casting blank is improved.
Specific implementation results:
application of production method of steel billet for high-nitrogen flange
1) Realizes the industrialized production and delivery of the steel billet for the high-quality high-nitrogen flange and the diversification of the application.
2) The steel billet for the high-nitrogen flange is sent to a third detection company for detection after being forged, the basic mechanical property is obviously improved by 1-2.3 times, the steel billet has strong hydrogen corrosion resistance, and the service life of the product is obviously prolonged.
3) The good economic benefit is realized, and the alloy cost is reduced by more than 20 percent compared with the same level.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (4)
1. A production method of a steel billet for a high-nitrogen flange is characterized by comprising the following steps of: the method comprises the following steps:
1) A converter smelting step: the ratio of the pretreated molten iron to the clean scrap steel is 5:1 to 7:1, charging molten iron at 1300-1400 ℃, wherein the S content in the molten iron is less than or equal to 0.04%, and active lime and high-silicon dolomite are added to ensure the slag alkalinity; top-bottom combined converting, bottom blowing adopts a whole-course nitrogen blowing mode, and the nitrogen supply intensity is 0.05m 3 /min﹒t～0.07m 3 And (3) carrying out slag washing operation in the tapping process, wherein the pressure of nitrogen supply is 1.2Mpa by ladle bottom blowing, the flow is controlled at 300-500.0Nl/min, the impurities are ensured to be fully gathered and float upwards after deoxidation, the purity of molten steel is improved, the end temperature of the molten steel is used for executing the current operation standard, and finally the converter is usedThe offsite nitrogen content is controlled at 40+/-5 ppm;
2) LF refining: station white slag desulfurization adopts bottom blowing nitrogen in the whole process, the nitrogen supply pressure in the treatment process is 1.2Mpa, the flow is controlled at 500.0Nl/min, the slag forming speed is high, the holding time is more than or equal to 15 minutes, and the final slag component is controlled to be CaO/SiO2=4.5: 1 to 7.0:1, a step of; the diameter of a bright ring is not more than 1/3 of the diameter of a ladle during slag melting; after deoxidization alloying of molten steel is completed, adopting nitrogen supply pressure of 1.2Mpa, controlling flow rate to be 100.0Nl/min, carrying out soft blowing for more than or equal to 5 minutes, keeping the slag surface in a slightly fluctuating state during soft blowing, and controlling nitrogen content in steel at 60+/-5 ppm during discharging;
3) RH refining: the RH whole process adopts nitrogen circulation, the nitrogen pressure is 1.2Mpa, the circulation is 1500L/min, RH vacuum pumping treatment is carried out for 20min, the vacuum degree is controlled below 266Pa in the first 5min, the method is mainly used for adjusting the nitrogen content of vanadium-nitrogen alloy and silicon-manganese nitride alloying, the nitrogen content in steel is added to a target value, the specific vanadium-nitrogen alloy brands are FeV45N10, feV55N11 or FeV65N13, and the specific silicon-manganese nitride alloy comprises the following chemical components in percentage by mass: c is less than or equal to 0.25 percent, si is 40-45 percent, mn is 10-15 percent, P is less than or equal to 0.03 percent, S is less than or equal to 0.02 percent, N is 25-30 percent, and Fe is less than or equal to 15 percent; the light treatment is adopted in the last 15 minutes, the vacuum degree is controlled to be 5kPa, the vacuum degree is used for controlling the cleanliness of molten steel and finely adjusting the molten steel according to the nitrogen content in the molten steel, the nitrogen supply pressure is 1.2Mpa after the calcium-restoring treatment, the flow is controlled to be 100.0Nl/min for carrying out soft blowing, the soft blowing time is more than or equal to 10 minutes, the [ H ] in the molten steel is less than or equal to 2ppm, the [ O ] is less than or equal to 30ppm, and the target value is less than or equal to the upper limit value of [ N ] when the molten steel leaves the position;
4) And (3) continuous casting: in the casting process of the high-nitrogen flange, the solubility of nitrogen in steel is reduced along with the reduction of the temperature, the crack rate of a billet for the high-nitrogen flange, which adopts the crystallizer casting powder special for the high-nitrogen flange steel, is reduced to less than 1% under the constant pulling speed; the crystallizer casting powder special for the high-nitrogen flange steel mainly comprises the following components in percentage by mass:
SiO 2 :30.42％，Al 2 O 3 ：6.20％，CaO：33.96％，F - ：5.30％，Na 2 o:8.76%; cf:3.67%, melting point 1150 ℃, viscosity at 1300 ℃ of 0.288Pa & s;
5) Heating and preserving heat: putting the red hot steel billet into a heat preservation pit, and heating and preserving the heat for more than or equal to 48 hours according to a formulated heating and preserving system, wherein the initial temperature is 600-750 ℃, the preserving temperature is 350-450 ℃, and the slow cooling time is 24 hours; the total heating and heat preserving time of the casting blank is more than or equal to 72 hours, the temperature gradient of the surface layer of the casting blank is reduced, the execution of a heating, heat preserving and slow cooling system of the high-nitrogen flange casting blank is strictly ensured, the escape of nitrogen elements is reduced, meanwhile, the segregation is reduced by uniform components, the internal stress of the structure is fully released, and the plastic toughness of the high-nitrogen flange casting blank is improved.
2. The method for producing a steel billet for a high nitrogen flange according to claim 1, wherein: and 2) controlling the terminal carbon of the transfer furnace to be higher than 0.05%, and controlling the steelmaking terminal temperature to be 1610-1650 ℃.
3. The method for producing a steel billet for a high nitrogen flange according to claim 1, wherein: and 2) adding Al for deoxidization after tapping of the transfer furnace, wherein the Al content of the molten steel is 0.030-0.060%.
4. The method for producing a steel billet for a high nitrogen flange according to claim 1, wherein: step 5) ensuring that the temperature in the steel billet for the high-nitrogen flange for 72h is not lower than 350 ℃.
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| CN101121992A (en) * | 2007-09-18 | 2008-02-13 | 湖南华菱涟源钢铁有限公司 | Method for producing strong annealed steel hot-rolled sheet coil |
| CN111809018A (en) * | 2020-06-17 | 2020-10-23 | 包头钢铁（集团）有限责任公司 | Method for improving hydrogen cracking resistance and hydrogen sulfide corrosion resistance of steel blank for 16MnHIC flange |
| WO2020215688A1 (en) * | 2019-04-23 | 2020-10-29 | 南京钢铁股份有限公司 | Process for smelting ultra-low-carbon and ultra-low-sulfur steel |
| CN111876688A (en) * | 2020-08-12 | 2020-11-03 | 宝武集团鄂城钢铁有限公司 | Smelting method of high-nitrogen sulfur-containing free-cutting steel |
| CN112899440A (en) * | 2021-01-19 | 2021-06-04 | 重庆钢铁股份有限公司 | RH nitrogen-blowing alloying process for accurately controlling nitrogen content of nitrogen-containing steel |
-
2022
- 2022-08-04 CN CN202210932268.3A patent/CN115449583B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101121992A (en) * | 2007-09-18 | 2008-02-13 | 湖南华菱涟源钢铁有限公司 | Method for producing strong annealed steel hot-rolled sheet coil |
| WO2020215688A1 (en) * | 2019-04-23 | 2020-10-29 | 南京钢铁股份有限公司 | Process for smelting ultra-low-carbon and ultra-low-sulfur steel |
| CN111809018A (en) * | 2020-06-17 | 2020-10-23 | 包头钢铁（集团）有限责任公司 | Method for improving hydrogen cracking resistance and hydrogen sulfide corrosion resistance of steel blank for 16MnHIC flange |
| CN111876688A (en) * | 2020-08-12 | 2020-11-03 | 宝武集团鄂城钢铁有限公司 | Smelting method of high-nitrogen sulfur-containing free-cutting steel |
| CN112899440A (en) * | 2021-01-19 | 2021-06-04 | 重庆钢铁股份有限公司 | RH nitrogen-blowing alloying process for accurately controlling nitrogen content of nitrogen-containing steel |
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