CN115612932A - Smelting method of high-corrosion-resistance steel - Google Patents
Smelting method of high-corrosion-resistance steel Download PDFInfo
- Publication number
- CN115612932A CN115612932A CN202211270337.5A CN202211270337A CN115612932A CN 115612932 A CN115612932 A CN 115612932A CN 202211270337 A CN202211270337 A CN 202211270337A CN 115612932 A CN115612932 A CN 115612932A
- Authority
- CN
- China
- Prior art keywords
- steel
- percent
- alloy
- antimony
- added
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
-
- 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
-
- 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
-
- 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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- 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
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
-
- 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 belongs to the field of metallurgy, and relates to a method for smelting high-corrosion-resistant steel, which comprises the following chemical components in percentage by mass: 0.05 to 0.08 percent of C, 0.15 to 0.25 percent of Si, 0.75 to 0.95 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.003 percent of S, 0.85 to 1.05 percent of Cr, 0.20 to 0.25 percent of Ni, 0.35 to 0.40 percent of Cu, 0.018 to 0.028 percent of Nb, 0.010 to 0.035 percent of Ti, 0.05 to 0.15 percent of Sb and the balance of iron and inevitable impurities; the smelting process route comprises the steps of molten iron pretreatment, converter, LF furnace refining and straight arc-shaped slab caster; after adopting occupational health protection method, adding antimony alloy before adding titanium alloy after the LF furnace component is adjusted. The invention reduces the pollution of the antimony element added in the steel to the site by optimizing the alloying sequence of the LF furnace, ensures the metal yield of each alloy element in the antimony-containing high-corrosion-resistance steel, and realizes smelting of the antimony-containing high-corrosion-resistance steel in a steel plant.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to a method for smelting high-corrosion-resistant steel with 0.1% of antimony content.
Background
The weathering steel, namely the atmospheric corrosion resistant steel, contains a small amount of weathering alloy elements, has good corrosion resistance in the atmosphere and is low alloy steel with lower price compared with stainless steel. The weather-resistant steel has atmospheric corrosion resistance 2-8 times that of plain carbon steel, and the longer the service life is, the more outstanding the corrosion resistance is. As a high-efficiency steel, weathering resistant steel is always a hotspot for developing steel products for atmospheric corrosion and researching corrosion.
With the rapid development of railway construction in China, railway vehicles gradually develop towards high speed, heavy load and reduction, which puts higher requirements on the comprehensive use performance of the weather-resistant structural steel for the railway vehicles, and a new generation of high corrosion resistance steel for railway freight cars needs to be developed. The weather-resistant steel containing copper and antimony is widely considered as one of the domestic ideal steel products for resisting low-temperature corrosion of sulfuric acid, and has strong corrosion resistance to hydrochloric acid (HC 1), hydrofluoric acid (HF), caustic soda (Na 0H) and sodium chloride (NaC 1). The addition of antimony can improve the hardness and corrosion resistance of the steel and can ensure that the corrosion rate of the steel is less than or equal to 0.8g/m < 2 >. H.
However, because antimony and compounds thereof belong to toxic substances, dust containing the toxic substances is generated in the smelting process, and acute and chronic poisoning accidents are easy to happen when the antimony and the compounds thereof are contacted. Because of the strong production danger and the high protection difficulty, steel mills cannot carry out the large production of antimony-containing steel. Therefore, the smelting process of the antimony-containing steel is not clear, the addition of the antimony element influences the smelting process due to the particularity of the antimony element, the harm of antimony toxicity to production workers is reduced in the smelting process, the occupational health requirement is met, the influence of antimony on elements in other steel is considered, the stability of antimony yield is ensured, and conditions are created for batch stable production.
In order to meet the development requirement of weathering resistant steel, a new generation of high corrosion resistance steel for railway freight cars is developed, and antimony is added into the steel to improve the corrosion resistance of the steel. The invention provides a smelting method of high-corrosion-resistant steel with 0.1% of antimony content, which realizes smelting of antimony-containing high-corrosion-resistant steel.
Disclosure of Invention
The invention aims to solve the problems and provides a method for smelting high-corrosion-resistance steel.
The purpose of the invention is realized as follows: a smelting method of high-corrosion-resistant steel comprises the following chemical components in percentage by mass, wherein the high-corrosion-resistant steel contains 0.1% of antimony: 0.05 to 0.08 percent of C, 0.15 to 0.25 percent of Si, 0.75 to 0.95 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.003 percent of S, 0.85 to 1.05 percent of Cr, 0.20 to 0.25 percent of Ni, 0.35 to 0.40 percent of Cu, 0.018 to 0.028 percent of Nb, 0.010 to 0.035 percent of Ti, 0.05 to 0.15 percent of Sb, and the balance of Fe and inevitable impurities.
A smelting method of high-corrosion-resistance steel with 0.1% of antimony content comprises the following steps: the method comprises the following steps: pretreating molten iron; the content of S in the molten iron is required to be reduced to below 0.005 percent; step two: smelting in a converter; (1) The molten iron S in the converter is required to be less than or equal to 0.005 percent, and the scrap steel with S less than 0.02 percent is used; (2) Adding alloy elements in sequence from low to high in oxidation activity; (3) The final temperature of the tapping molten steel of the converter is 1650-1680 ℃, and the mass percentages of the chemical components are as follows: c is less than or equal to 0.05, P is less than or equal to 0.008, S is less than or equal to 0.020, cu:0.35-0.40, ni:0.20-0.25, and the balance of iron and inevitable impurities; step three: refining in an LF furnace: adding 500-700kg lime in the station, adding 200-300kg aluminum pills, and strongly stirring at a double-tube bottom blowing flow rate of 1200-1400L/min for 7-15min for desulfurization; the outbound temperature is required to be 1570-1585 ℃; step four: continuous casting: an arc slab caster with straight line segments is adopted.
In the second step, the alloy adding mode is as follows: because the Ni and Cu elements do not generate oxidation reaction basically in the converter, the weight of the Ni alloy and the Cu plate required by the molten steel in a single furnace is calculated according to the control middle limit of the content of the finished product, namely the addition amount of the alloy = the actual molten steel amount multiplied by the control middle limit of the content of the finished product divided by the content of Ni and Cu of the Ni alloy and the Cu plate divided by the content of Ni and Cu of the Cu plate and the yield of the Cu elements are added into the converter along with the scrap steel, and the alloying process is completed in the furnace; alloy is added after tapping to deoxidize and alloy the molten steel, and Cr and Mn components in the steel are added into the lower control limit in the converter tapping process; the re-melting molten steel of the steel grade can only be used for smelting plain carbon steel and high-grade carbon steel in order to prevent the residual Cr, cu and Sb from being qualified, and the charging amount of the re-melting molten steel is determined by correspondingly converting the content of corresponding elements, namely the charging amount of the re-melting molten steel of the steel grade is required to be less than the molten steel amount of the plain carbon steel/high-grade carbon steel and multiplied by the control requirement upper limit of the content of Cr, cu and Sb in the plain carbon steel/high-grade carbon steel and divided by the content of Cr, cu and Sb in the re-melting molten steel.
In the third step, the alloy adding sequence of the LF furnace is as follows: adding Nb alloy, then adding Sb alloy, then adding Ti alloy and finally feeding calcium silicate wire; in order to reduce the pollution of antimony-containing dust to a production site, antimony alloy is required to be added after the components of the LF furnace are adjusted; in order to improve the yield of Ti, adding titanium alloy after adding antimony alloy; the molten steel component control requirement before adding the antimony alloy is as follows: in order to ensure the yield of Sb, after the desulfurization is finished, other elements except titanium meet the requirement range of entering the steel component control, and antimony alloy is added when the Al content in the steel is added to 0.05-0.08%; after antimony alloy is added, the LF furnace cannot be powered on again and heated; the stirring process after adding the antimony alloy comprises the following steps: the ladle bottom blowing stirring is required to be carried out for 5-8min under the bottom blowing argon flow of 300-400L/min, and then titanium alloy is added; the antimony alloy adding method comprises the following steps: because the shape of the antimony ingot is large, 20-22kg of antimony ingot can not be added through an LF furnace charge bin, and the antimony ingot is hoisted and added into a steel ladle by using a crown block in production.
The invention has the beneficial effects that: 1. the invention adopts the smelting process of pretreatment, converter and refining furnace to smelt the antimony-containing high corrosion-resistant steel; 2. the invention adopts effective and feasible occupational health protection measures, so that the smelting of antimony-containing high-corrosion-resistance steel in a steel plant becomes possible. 3. The invention realizes the production of the low-sulfur weathering steel with S less than or equal to 0.003 percent by controlling the sulfur content in the steel through the whole smelting process. 4. The invention realizes the stable production of the weathering steel with 0.1 percent of antimony content by reasonably setting the antimony alloying process, and the antimony yield can reach more than 98 percent. 5. The invention reduces the pollution of the antimony element added in the steel to the site by optimizing the alloying sequence of the LF furnace, simultaneously ensures the metal yield of each alloying element in the steel, and the yield of the easily oxidized element Ti reaches more than 80 percent. 6. The invention reduces the pollution of the antimony element added in the steel to the site by optimizing the alloying sequence of the LF furnace, ensures the metal yield of each alloy element in the antimony-containing high-corrosion-resistance steel, and realizes smelting of the antimony-containing high-corrosion-resistance steel in a steel plant.
Detailed Description
The invention provides a smelting method of antimony-containing high-corrosion-resistance steel, which adopts an effective occupational health protection method to realize safe smelting of the antimony-containing steel; the adding mode of the antimony alloy is determined, and the smelting with high antimony yield is realized.
The production process route of the antimony-containing high-corrosion-resistance steel comprises the following steps: molten iron pretreatment, converter-LF furnace refining, and straight arc-shaped slab continuous casting machine; operators in the smelting process must wear KN 95-grade and above dust masks, goggles and protective gloves to produce in the environment with negative pressure dust removal equipment; the alloy adding sequence of the LF furnace is as follows: firstly adding Nb alloy, then adding Sb alloy and finally adding Ti alloy; the requirements of molten steel conditions before adding the antimony alloy are as follows: after the deep desulfurization of the LF furnace is finished, controlling other elements except titanium to be within a required range, adding 210-230kg of antimony ingots (taking 210 tons of molten steel as an example) when the Al content in steel is added to be 0.05-0.08%, wherein the yield of antimony can reach more than 98%; the antimony alloy adding method comprises the following steps: the shape of the antimony ingot is limited, and the antimony ingot is added in a hoisting mode of a crown block; the stirring process after adding the antimony alloy comprises the following steps: stirring the LF furnace for 5-8min under the bottom blowing argon flow of 300-400L/min, and then adding titanium alloy.
Technical scheme
The steel grade comprises the following chemical components in percentage by mass: 0.05 to 0.08 percent of C, 0.15 to 0.25 percent of Si, 0.75 to 0.95 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.003 percent of S, 0.85 to 1.05 percent of Cr, 0.20 to 0.25 percent of Ni, 0.35 to 0.40 percent of Cu, 0.018 to 0.028 percent of Nb, 0.010 to 0.035 percent of Ti, 0.05 to 0.15 percent of Sb and the balance of iron and inevitable impurities.
The alloy addition amount of the invention is added in an amount to produce 210 tons of molten steel; in order to ensure the production safety, the occupational health protection method adopted in the production is as follows: 1. negative pressure dust removal facilities are required to be equipped in all relevant working procedures in the production process; 2. in the production process, related operators wear KN 95-grade and above dustproof masks, goggles and protective gloves; 3. the operators need to clean working clothes and safety helmets before entering the master control room and leaving the operation site after contacting antimony, and wash hands before eating, drinking and the like.
The process route of the invention is as follows: molten iron pretreatment, converter, LF furnace refining and straight arc-shaped slab continuous casting machine; the converter smelting process comprises the following steps: 1. the molten iron S fed into the converter is required to be less than or equal to 0.005 percent, and scrap steel with S less than 0.02 percent is used; 2. the alloy elements should be added in sequence from low to high in oxidation activity, and in order to ensure accurate control of the alloy elements, the alloy addition mode is as follows: (1) Because the Ni and Cu elements basically do not generate oxidation reaction in the converter, the weight of Ni alloy and Cu plates required by single-furnace molten steel is calculated according to the target middle limit of the content of finished products, and the Ni alloy and the Cu plates are added into the converter along with scrap steel to complete the alloying process in the converter; (2) Alloy is added after tapping to deoxidize and alloy the molten steel, and Cr and Mn components in the steel are added into the lower control limit in the converter tapping process; 3. the final temperature of molten steel tapped from the converter is 1650-1680 ℃, and the mass percentages of the chemical components are as follows: c is less than or equal to 0.05, P is less than or equal to 0.008, S is less than or equal to 0.020, cu:0.35-0.40, ni:0.20-0.25, and the balance of iron and inevitable impurities; 4. in order to prevent the defective discharge of Cr, ni, cu and Sb, the return molten steel of the steel grade can only be used for smelting plain carbon steel and high-quality carbon steel, and the loading amount of the return molten steel is determined by correspondingly converting the content of corresponding elements; 5, LF furnace refining process: (1) And (3) putting 500-700kg of lime into the station, adding 200-300kg of aluminum pills, and strongly stirring at the double-pipe bottom blowing flow rate of 1200-1400L/min for 7-15min for desulfurization. (2) alloy addition sequence of the LF furnace: adding Nb alloy, then adding Sb alloy, then adding Ti alloy, and finally feeding calcium silicate wire. In order to reduce the pollution of antimony-containing dust to a production site, antimony alloy is required to be added after the components of the LF furnace are adjusted; in order to improve the yield of Ti, adding the titanium alloy after adding the antimony alloy; 6. the molten steel component control requirement before adding the antimony alloy is as follows: in order to ensure the yield of Sb, after the desulfurization is finished, other elements except titanium meet the component control requirement, and antimony alloy is added when the Al content in the steel is added to 0.05-0.08%; 7. after antimony alloy is added, the LF furnace cannot be powered on again and heated; 8. the stirring process after adding the antimony alloy comprises the following steps: the steel ladle is required to be stirred for more than 5-8min by bottom blowing under the bottom blowing argon flow of 300-400L/min, and then titanium alloy is added; 9. the antimony alloy adding method comprises the following steps: because the shape of the antimony ingot is large, each block is 20-22kg, and cannot be added through an LF furnace burden bin, and the antimony ingot is hoisted by a crown block and added into a steel ladle in production; 10. the temperature of the outlet is 1570-1585 ℃.
Example one
A furnace of high corrosion resistant steel with 0.10% antimony content is produced with a cross section of 230 x 1530/1330mm. The adopted process route comprises the following steps: molten iron pretreatment, converter, LF refining and continuous casting machine.
Occupational health protection: 1. the normal operation of the dust removing equipment is ensured in the production process, and an axial flow fan is arranged on the site for forced ventilation; 2. antimony carrying (including transportation, loading and unloading) and charging; smelting operation in an LF furnace, and taking a steel sample and a slag sample; continuous casting operation, continuous casting blank cutting and blank sample sampling; hoisting steel ladles, and deslagging smelting slag; cleaning a steel ladle; relevant operators wear KN 95-grade and above dust masks, goggles and protective gloves according to specifications in the operation links of examination, chemical examination, sample preparation and the like.
And finishing the pretreatment procedure to ensure that the S content of the molten iron is 0.003%.
The tapping temperature of the converter is 1660 ℃; the chemical compositions by weight percentage are respectively 0.033C, 0.0053P, 0.0086S, 0.21 Ni and 0.363 Cu, and the balance is iron and inevitable impurities.
600kg of lime and 200kg of aluminum pills are added when the LF furnace enters a station, and desulfurization is carried out by strong stirring at the double-tube bottom blowing flow rate of 1200L/min for 9 min. After the components are finely adjusted, the Al content in the steel is adjusted to 0.054 percent, then the steel is hoisted by adopting a crown block and is added with 230kg of antimony ingot, the steel ladle is stirred for 8min at the bottom blowing flow of 300L/min, and then ferrotitanium is added. The temperature is not raised again after adding the antimony alloy, and the leaving temperature is 1572 ℃.
The alloy solution has the end point chemical components in the following mass percentages: 0.057 for C, 0.19 for Si, 0.85 for Mn, 0.0067 for P, 0.0012 for S, 0.926 for Cr, 0.22 for Ni, 0.37 for Cu, 0.023 for Nb, 0.03 for Ti, 0.1079 for Sb, and the balance iron and unavoidable impurities.
The Sb yield was calculated from the amount of antimony added as follows.
The alloy used is as follows.
Example two
A furnace of high corrosion resistant steel with 0.10% antimony content is produced, with a cross section of 230 x 1530/1330mm. The adopted process route comprises the following steps: molten iron pretreatment, converter, LF refining and continuous casting machine.
And finishing the pretreatment process, wherein the S content of the molten iron is 0.004%.
The tapping temperature of the converter is 1666 ℃; the chemical components of the steel tapped after the converter are respectively 0.022 percent of C, 0.0069 percent of P, 0.0094 percent of S, 0.20 percent of Ni, 0.357 percent of Cu and the balance of iron and inevitable impurities in percentage by mass.
600kg of lime and 300kg of aluminum pills are added when the LF furnace enters a station, and desulfurization is carried out by strongly stirring the double-pipe bottom blowing flow at the rate of 1400L/min for 12 min. After the components are finely adjusted, the Al content in the steel is adjusted to 0.051 percent, then a crown block is adopted for hoisting and is added with 213kg of antimony ingot, the steel ladle is stirred for 5min at the bottom blowing flow of 300L/min, and then ferrotitanium is added. The temperature is not increased again after the antimony alloy is added, and the outlet temperature is 1585 ℃.
The alloy solution has the end point chemical components in the following mass percentages: 0.063C, 0.204 si, 0.842 mn, 0.0084 p, 0.0017 s, 0.936 cr, 0.223 ni, 0.367 cu, 0.020 nb, 0.025 ti, 0.0983 sb, and the balance iron and unavoidable impurities.
The Sb yield was calculated from the amount of antimony added as follows.
The alloy used is as follows.
EXAMPLE III
A furnace of high corrosion resistant steel with 0.10% antimony content is produced, with a cross section of 230 x 1530/1330mm. The adopted process route comprises the following steps: molten iron pretreatment, converter, LF refining and continuous casting machine.
And finishing the pretreatment process, wherein the S content of the molten iron is 0.003%.
The tapping temperature of the converter is 1672 ℃; the chemical components of steel tapped after the converter are respectively 0.03 percent of C, 0.0045 percent of P, 0.0052 percent of S, 0.20 percent of Ni, 0.36 percent of Cu and the balance of iron and inevitable impurities in percentage by mass.
500kg of lime and 200kg of aluminum pills are added when the LF furnace enters a station, and desulfurization is carried out by strongly stirring the double-pipe bottom blowing flow at the rate of 1400L/min for 8 min. After the components are finely adjusted, the Al content in the steel is adjusted to 0.075 percent, then the steel is hoisted by adopting a crown block and is added with 225kg of antimony ingot, the steel ladle is stirred for 5min at the bottom blowing flow of 300L/min, and then ferrotitanium is added. The temperature is not increased again after the antimony alloy is added, and the outlet temperature is 1582 ℃.
The alloy solution has the end point chemical components in the following mass percentages: 0.058 for C, 0.197 for Si, 0.866 for Mn, 0.0068 for P, 0.001 for S, 0.928 for Cr, 0.215 for Ni, 0.37 for Cu, 0.022 for Nb, 0.028 for Ti, 0.102 for Sb, and the balance iron and unavoidable impurities.
The Sb yield was calculated from the amount of antimony added as follows.
The alloy used is as follows.
The above description is only an embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.
Claims (4)
1. A smelting method of high corrosion-resistant steel is characterized by comprising the following steps: the high-corrosion-resistance steel with 0.1 percent of antimony comprises the following chemical components in percentage by mass: 0.05 to 0.08 percent of C, 0.15 to 0.25 percent of Si, 0.75 to 0.95 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.003 percent of S, 0.85 to 1.05 percent of Cr, 0.20 to 0.25 percent of Ni, 0.35 to 0.40 percent of Cu, 0.018 to 0.028 percent of Nb, 0.010 to 0.035 percent of Ti, 0.05 to 0.15 percent of Sb, and the balance of Fe and inevitable impurities.
2. A smelting method of high corrosion-resistant steel is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: pretreating molten iron; the content of S in the molten iron is required to be reduced to below 0.005 percent;
step two: smelting in a converter; (1) The molten iron S in the converter is required to be less than or equal to 0.005 percent, and the scrap steel with S less than 0.02 percent is used; (2) Adding alloy elements in sequence from low to high in oxidation activity; (3) The final temperature of molten steel tapped from the converter is 1650-1680 ℃, and the mass percentages of the chemical components are as follows: c is less than or equal to 0.05, P is less than or equal to 0.008, S is less than or equal to 0.020, cu:0.35-0.40, ni:0.20-0.25, the balance being iron and unavoidable impurities;
step three: refining in an LF furnace: adding 500-700kg of lime in the station, adding 200-300kg of aluminum pills, and strongly stirring at the double-pipe bottom blowing flow rate of 1200-1400L/min for 7-15min for desulfurization; the outbound temperature is required to be 1570-1585 ℃;
step four: continuous casting: an arc slab caster with straight line segments is adopted.
3. The method for smelting high corrosion-resistant steel according to claim 2, wherein: in the second step, the alloy adding mode is as follows: because the Ni and Cu elements do not generate oxidation reaction basically in the converter, the weight of the Ni alloy and the Cu plate required by the molten steel in a single furnace is calculated according to the control middle limit of the content of the finished product, namely the addition amount of the alloy = the actual molten steel amount multiplied by the control middle limit of the content of the finished product divided by the content of Ni and Cu of the Ni alloy and the Cu plate divided by the content of Ni and Cu of the Cu plate and the yield of the Cu elements are added into the converter along with the scrap steel, and the alloying process is completed in the furnace; alloy is added after tapping to deoxidize and alloy the molten steel, and Cr and Mn components in the steel are added into the lower control limit in the converter tapping process; the re-melting molten steel of the steel grade can only be used for smelting plain carbon steel and high carbon steel in order to prevent the residual Cr, cu and Sb from being qualified, and the charging amount of the re-melting molten steel is determined by correspondingly converting the content of corresponding elements, namely the charging amount of the re-melting molten steel of the steel grade is required to be less than the molten steel amount of the plain carbon steel/high carbon steel, multiplied by the control requirement upper limit of the content of Cr, cu and Sb in the plain carbon steel/high carbon steel and divided by the content of Cr, cu and Sb in the re-melting molten steel.
4. The method for smelting high corrosion-resistant steel according to claim 2, wherein: in the third step, the alloy adding sequence of the LF furnace is as follows: firstly adding Nb alloy, then adding Sb alloy, then adding Ti alloy, and finally feeding a calcium-silicon wire; in order to reduce the pollution of antimony-containing dust to a production site, antimony alloy is required to be added after the components of the LF furnace are adjusted; in order to improve the yield of Ti, adding the titanium alloy after adding the antimony alloy; the molten steel component control requirement before adding the antimony alloy is as follows: in order to ensure the yield of Sb, after the desulfurization is finished, other elements except titanium meet the requirement range of entering the steel component control, and antimony alloy is added when the Al content in the steel is added to 0.05-0.08%; after antimony alloy is added, the LF furnace cannot be powered on again and heated; the stirring process after adding the antimony alloy comprises the following steps: the ladle bottom blowing stirring is required to be carried out for 5-8min under the bottom blowing argon flow of 300-400L/min, and then titanium alloy is added; the antimony alloy adding method comprises the following steps: because the shape of the antimony ingot is large, 20-22kg of antimony ingots cannot be added through an LF furnace burden bin, and the antimony ingot is hoisted by a crown block and added into a steel ladle in production.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211270337.5A CN115612932A (en) | 2022-10-18 | 2022-10-18 | Smelting method of high-corrosion-resistance steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211270337.5A CN115612932A (en) | 2022-10-18 | 2022-10-18 | Smelting method of high-corrosion-resistance steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115612932A true CN115612932A (en) | 2023-01-17 |
Family
ID=84862837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211270337.5A Pending CN115612932A (en) | 2022-10-18 | 2022-10-18 | Smelting method of high-corrosion-resistance steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115612932A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003213367A (en) * | 2001-11-19 | 2003-07-30 | Nippon Steel Corp | Low alloy steel having excellent hydrochloric acid- corrosion and sulfuric acid-corrosion resistance and welded joint thereof |
| JP2007239095A (en) * | 2006-02-10 | 2007-09-20 | Nippon Steel Corp | Acid corrosion resistant steel |
| CN106893798A (en) * | 2017-04-02 | 2017-06-27 | 首钢总公司 | A kind of corrosion-resisting steel adds the smelting process of antimony |
| CN111519085A (en) * | 2020-06-09 | 2020-08-11 | 首钢集团有限公司 | Antimony-containing weathering steel and smelting method and application thereof |
| CN113046638A (en) * | 2021-03-09 | 2021-06-29 | 山西建龙实业有限公司 | SNS acid-resistant steel high-quality casting blank for gas pipeline and production method thereof |
| CN113564486A (en) * | 2021-06-28 | 2021-10-29 | 武汉钢铁有限公司 | Antimony-containing acid corrosion-resistant steel with yield strength of 500MPa and preparation method thereof |
| JP2022044093A (en) * | 2020-09-07 | 2022-03-17 | 日本製鉄株式会社 | Steel |
-
2022
- 2022-10-18 CN CN202211270337.5A patent/CN115612932A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003213367A (en) * | 2001-11-19 | 2003-07-30 | Nippon Steel Corp | Low alloy steel having excellent hydrochloric acid- corrosion and sulfuric acid-corrosion resistance and welded joint thereof |
| JP2007239095A (en) * | 2006-02-10 | 2007-09-20 | Nippon Steel Corp | Acid corrosion resistant steel |
| CN106893798A (en) * | 2017-04-02 | 2017-06-27 | 首钢总公司 | A kind of corrosion-resisting steel adds the smelting process of antimony |
| CN111519085A (en) * | 2020-06-09 | 2020-08-11 | 首钢集团有限公司 | Antimony-containing weathering steel and smelting method and application thereof |
| JP2022044093A (en) * | 2020-09-07 | 2022-03-17 | 日本製鉄株式会社 | Steel |
| CN113046638A (en) * | 2021-03-09 | 2021-06-29 | 山西建龙实业有限公司 | SNS acid-resistant steel high-quality casting blank for gas pipeline and production method thereof |
| CN113564486A (en) * | 2021-06-28 | 2021-10-29 | 武汉钢铁有限公司 | Antimony-containing acid corrosion-resistant steel with yield strength of 500MPa and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101328555B (en) | Mixing method of high quality low phosphor and sulfur high-alloy steel | |
| CN103642970B (en) | A kind of smelting process of carbon aluminium-killed steel | |
| CN103468874B (en) | Method for manufacturing low-carbon TWIP steel through AOD (argon oxygen decarburization) furnace | |
| CN102296157A (en) | Very low Ti control method of ultralow-carbon aluminum-silicon killed steel | |
| CN101962714B (en) | Production method of low-silicon low-titanium and high-carbon ferrochrome smelted by submerged arc furnace | |
| CN105039648A (en) | Method for smelting low-carbon and high-manganese-content molten steel through argon oxygen decarburizing furnace | |
| CN108531755B (en) | Vacuum induction furnace smelting process of high-aluminum type high-temperature alloy GH6783 | |
| CN114134352B (en) | Slag remover for smelting brass from waste and method for smelting brass | |
| CN102851447B (en) | Outside-furnace refining production method of steel used in carbon steel welding wire | |
| CN108893682B (en) | Die steel billet and preparation method thereof | |
| CN105364029A (en) | Thick-wall steel casting solidification structure refining and purifying method | |
| CN113249635B (en) | Production method of ultra-pure and ultra-homogeneous high-carbon chromium electroslag bearing steel | |
| CN109881121A (en) | The high-strength anti-seismic steel bar and its production method and purposes of a kind of anti-chlorine ion corrosion | |
| CN109722589B (en) | Production method for semisteel smelting weathering steel | |
| CN115612932A (en) | Smelting method of high-corrosion-resistance steel | |
| CN110791700A (en) | Preparation method of high-carbon ferrochrome | |
| CN101775531B (en) | Nickel-molybdenum-copper alloy and preparation method thereof | |
| CN110714161B (en) | High-sulfur free-cutting steel for automobile and production process thereof | |
| CN106498116A (en) | A kind of production technology of circle chain of mine steel | |
| CN113604725A (en) | Method for manufacturing rare earth ultra-pure propeller shaft | |
| CN100412215C (en) | Copper-nickel-silicon-ferroalloy | |
| CN102031451B (en) | Vanadium-titanium containing carbon steel and manufacturing method thereof | |
| CN111560558A (en) | Process method for reducing steelmaking cost by converting molten iron into molten steel | |
| CN105039649A (en) | Method for smelting high-carbon-content and high-manganese-content molten steel through argon oxygen decarburizing furnace | |
| CN114790503B (en) | Smelting method with addition of iron ore |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |