US3854932A - Process for production of stainless steel - Google Patents
Process for production of stainless steel Download PDFInfo
- Publication number
- US3854932A US3854932A US00370904A US37090473A US3854932A US 3854932 A US3854932 A US 3854932A US 00370904 A US00370904 A US 00370904A US 37090473 A US37090473 A US 37090473A US 3854932 A US3854932 A US 3854932A
- Authority
- US
- United States
- Prior art keywords
- converter
- oxygen
- stainless steel
- carbon
- pressure
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 58
- 230000008569 process Effects 0.000 title claims abstract description 58
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 25
- 239000010935 stainless steel Substances 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title abstract description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 76
- 239000001301 oxygen Substances 0.000 claims abstract description 76
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 76
- 239000011261 inert gas Substances 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 46
- 239000007789 gas Substances 0.000 claims description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 26
- 229910052799 carbon Inorganic materials 0.000 claims description 26
- 229910052786 argon Inorganic materials 0.000 claims description 23
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 20
- 239000002893 slag Substances 0.000 claims description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 230000003292 diminished effect Effects 0.000 claims description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 6
- 239000001569 carbon dioxide Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000003467 diminishing effect Effects 0.000 claims description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 18
- 229910052804 chromium Inorganic materials 0.000 abstract description 18
- 239000011651 chromium Substances 0.000 abstract description 18
- 238000006243 chemical reaction Methods 0.000 description 34
- 229910052751 metal Inorganic materials 0.000 description 23
- 239000002184 metal Substances 0.000 description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 22
- 229910002090 carbon oxide Inorganic materials 0.000 description 18
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical class [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 15
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 239000000155 melt Substances 0.000 description 13
- 229910052742 iron Inorganic materials 0.000 description 10
- 239000000047 product Substances 0.000 description 10
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
- 239000012071 phase Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 229910052759 nickel Inorganic materials 0.000 description 7
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- 229910052717 sulfur Inorganic materials 0.000 description 6
- 239000011593 sulfur Substances 0.000 description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- 238000007670 refining Methods 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 description 4
- 239000007795 chemical reaction product Substances 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 4
- 235000013980 iron oxide Nutrition 0.000 description 4
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- 235000012255 calcium oxide Nutrition 0.000 description 3
- 229910000423 chromium oxide Inorganic materials 0.000 description 3
- 239000010436 fluorite Substances 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000007792 addition Methods 0.000 description 2
- 238000013019 agitation Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- UOUJSJZBMCDAEU-UHFFFAOYSA-N chromium(3+);oxygen(2-) Chemical class [O-2].[O-2].[O-2].[Cr+3].[Cr+3] UOUJSJZBMCDAEU-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- VVTSZOCINPYFDP-UHFFFAOYSA-N [O].[Ar] Chemical compound [O].[Ar] VVTSZOCINPYFDP-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
Images
Classifications
-
- 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
- C21C7/0081—Treating and handling under pressure
-
- 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
- C21C5/005—Manufacture of stainless steel
-
- 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
-
- 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
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
Definitions
- the primary reason for the refining process is to effect the reaction between carbon and oxygen for the purpose of removing carbon from the liquid metal.
- the reaction between oxygen and iron is desirably avoided because it represents a loss of iron product.
- the reaction between oxygen and chromium also should be avoided because it results in a loss of chromium from the molten metal phase to the slag phase, and the presence of chromium oxides in the slag phase creates a viscous slag which interferes with the metal refining process.
- a viscous slag is undesirable because it shields the surface of the molten metal bath which retards the escape of carbon oxides and therefore interferes with the removal of carbon from themelt as will be described more fully hereinafter.
- the oxygen introduced through the lance impinges on the liquid phase within the converter and reacts with carbon, chromium. iron and anything else capable of being oxidized. It is thought that the oxygen doesn't necessarily react directly with carbon but rather becomes part of an oxygen inventory within the converter. At the conditions prevailing during conversion there is vigorous stirring and oxygen is mobile. For example, oxygen impinging against the surface may react with iron to form an iron oxide which becomes part of the oxygen inventory within the converter, but the iron oxide may react with carbon to produce iron and carbon oxide so that the ultimate effect of the oxygen is to produce a carbon oxide.
- the thermodynamics of the system will determine, among other things, what compounds are formed. For example, carbon and oxygen may react to form either carbon dioxide. carbon monoxide or both. The thermodynamics at the condiditons within the converter are such that the equilibrium distribution between carbon monoxide and carbon dioxide is such that more than percent of the carbon oxide formed will be carbon monoxide.
- the intense heat of the oxidation generally causes oxygen or argon-oxygen mixtures, which are introduced beneath the surface of the melt, to burn or otherwise destroy thetuyeres or porous plugs through which the gas mixtures are introduced; and in order to reduce the concentration of carbon oxides significantly within the bubbles, extremely large volumes of argon are required, in the range of 500 scf/ton of steel refined. Also, oxides may form in the vicinity of the tuyeres which can flux the lining as they rise to the surface of the bath thereby decreasing lining life.
- the process of this invention provides an economical and effective means to solve or greatly mitigate the abovenoted problems.
- the process of the present invention is a process for producing stainless steel by the oxygen steel process which includes providing a liquid charge suitable for producing chromium-containing stainless steels in an oxygen steel converter having a tuyere in its bottom. introducing oxygen into the converter through a lance so that it impinges against or is introduced beneath the surface of the liquid charge in the converter, introducing an inert or endothermic gas through the tuyere in the bottom of the converter, and maintaining a subatmospheric pressure within the converter.
- aliquid charge is referred to. the charge may be a mixture of liquid and solid material.
- inert gas is intended to define a gas that does not participate to any significant extent in the reactions taking place in the converter.
- Typical insert gases are argon and nitrogen.
- endothermic gas is intended to define a gas that experiences an endothermic reaction in the bath but neither the gas nor its reaction products affect the metal product.
- Water (steam). whichbreaks down to hydrogen and oxygen at the conditions within the bath, and CO which becomes oxygen and carbon monoxide. are two typical endothermic gases.
- Argon is the preferred gas where low-nitrogen steels are to be made.
- one or more tuyeres in the bottom of the converter are located on or near the center line of the bottom that lies in the same plane as the axis of rotation way or another for loading or discharging.
- argon or other inert gas at a relatively high pressure so that expansion of the gas at the tuyere will produce a local cooling effect which will prevent or at least diminish damage to the tuyere from the heat of the surrounding molten charge.
- tuyere(s) in the bottom section" of the converter as used in the specification and claims is intended to include the side walls of the converter at or near the actual lower most surface.
- the tuyeres may either by inserted through the lining horizontally or vertically. In the horizontal case, the lining life will probably be poorer than when the tuyeres are centrally located, but mixing may be more thorough.
- the converter must be maintained at subatmospheric pressure during the conversion process of this invention.
- subatmospheric pressure is maintained by employing a sealed hood and providing a forced exhaust system capable of removing gaseous reaction products and inert gas at a sufficient rate to maintain the desired subatmospheric pressure.
- the pressure in the conversion vessel will be progressively decreased as the conversion proceeds. Pressures of at most 100 mm Hg must be maintained, but lower pressures will frequently be required depending on the final alloy chemistry desired. For example, when carbon contents of 0.02 percent or lower are desired, a vessel pressure lower than mm Hg will usually be required.
- each bubble of argon is an in situ carbon oxide vacuumwhich causes the carbon oxide to leave the melt and enter the bubbles, thereby driving the oxygen inventory toward carbon oxide production even at the higher pressures below the surface of the melt.
- the bubbles of gas rising through the melt create violent agitation thereby exposing all portions of the molten material in the converter to the subatmospheric pressure at the surface thereby promoting the release of carbon oxides and the escape of them from the converter again, thereby driving the oxygen inventory toward the production of carbon oxides.
- FIG. 1 is a sectional elevation view of a device suitable for carrying out the process of the present invention taken along the line 1-1 of FIG. 2.
- FIG. 2 is a sectional plan view of the device illustrated in FIG. 1 taken along the line 2-2.
- FlGJ3 is a sectional elevation view of the device illustrated in FIG. 1 in position where molten metal is being discharged from the converter.
- the drawings illustrate a converter 10 which is formed of a steel shell 11 and a refractory lining 12.
- the converter is equipped with a supporting ring 13 upon which axles 15 are mounted for rotating the converter around a horizontal axis so that it may be tilted for loading and unloading.
- the converter is equipped with a lance .16 which extends through a hood 17 via I the hood l7 and lance l6 withdrawn to a position well above the converter 10.
- the converter 10 is rotated on the axles 15 to a tilted position wherein it receives a charge suitable for the production of stainless steel.
- the charge includes molten iron, contains O-30 percent chromium, 0-80 percent nickel, 0.1-7 percent carbon and the usual impurities and conventional slag forming materials.
- the tuyeres 22 are above the liquid level for the most part; however, to insure maintaining the tuyeres'open, a constant flow of gas, preferably air or nitrogen because they are inexpensive, is maintained through the tuyeres to avoid any possibility of molten metal entering them.
- Conversion is effected by blowing oxygen through the lance onto the surface of the molten charge with sufficient force to cause a dimple in the surface of the charge as illustrated at 28.
- a separate slag phase is not shown although one will exist in operation.
- argon gas is passed through header 25, and ultimately through tuyeres 22, and bubbles violently through the molten metal maintained in converter 10.
- the argon is introduced at a high pressure, at least 100 psi, so that it expands as it enters the molten metal bath to create a cooling effect immediately in the vicinity of the tuyeres thereby preserving the refractories in that area.
- Argon is introduced at a rate of from 5-l00 scfm.
- the low partial pressure of carbon oxides in the bubbles 27, the violent agitation effected by the rising bubbles of argon which exposes all portions of the molten metal 26 to the surface of the converter all tend to drive the reaction of oxygen with carbon rather than with iron or chromium and as a result there is very little formation of detrimental chromium oxides or wasteful iron oxides and a high production of carbon oxides per unit of oxygen introduced.
- the pouring spout 30 is provided with a vacuum cap to prevent air from being drawn into the converter and to prevent the liquid charge from splashing out.
- the product from the process may be a ferritic or austenitic stainless steel or nickel superalloy.
- a process embodying the invention was employed to produce stainless steel containing a maximum of 0.025 percent carbon, from 1.5-1.9 percent manganese, from 0.3-0.6 percent silicon, from 18-19 percent chromium, from 8.75-10 percent nickel, a maximum of 0.04 percent phosphorus and 0.015 percent sulfur.
- the process was initiated by tilting the vessel and charging it with 153,000 pounds of molten metal containing 0.96 percent carbon, 0.94 percent manganese, 0.031 percent phosphorus, 0.015 percent sulfur, 0.38 percent silicon, 19.05 percent chromium, 9.25 percent nickel and the balance substantially iron. Although the entire charge in this case was molten metal. the process may be effected using a charge that is partly molten and partly solid. The solid portion of the charge may include stainless steel scrap, ferrochromium alloys or other solid metal-bearing materials.
- argon gas was passed through the bottom tuyeres to prevent fouling of those tuyeres by molten metal.
- Argon gas was introduced at a rate of scfm. Nitrogen, carbon dioxide or even air may be passed through the tuyeres at this point in the process to conserve expensive argon.
- the temperature of the bath after charging was 2,820 F.
- the vessel When the charging of the vessel was complete, the vessel was rotated to vertical position and the hood was engaged with the top ofthe vessel to create a seal capable of holding a vacuum. The lance was lowered to a height of 40 inches above the surface of the bath, the
- a permissable variation of the process of this invention is to start the oxygen blow before a vacuum is provided in the vessel so that the initial carbon burn is effected at atmospheric pressure. It is also a permissable variation of the process to deslag the vessel after a short atmospheric oxygen blow after which a subatmosphe'ric oxygen blow is effected.
- the oxygen blow was effected at progressively decreasing oxygen rates and progressively lower absolute pressures.
- Oxygen was blown into the vessel at 1,000 scfm under a chamber pressure of 180 mm Hg for a period of 10 minutes after which the oxygen blow rate was reduced to 850 scfm and the chamber pressure was diminished to 150 mm Hg.
- the oxygen blow rate was diminished to 700 scfm and the chamber pressure diminished to mm Hg, and 5 minutes later the chamber pressure was diminished to 50 mm Hg.
- the oxygen blow rate was diminished to 450 scfm and the chamber pressure diminished to 35 mm Hg, and after another 9 minutes oxygen blowing was terminated, and the chamber pressure was diminished to 6 mm Hg.
- the argon flow rate was then increased to 30 scfm and the chamber pressure progressively reduced to 0.6 mm Hg over a period of 16 minutes, after which the vacuum seal was broken and the vessel was rotated in order to take a test sample and to measure the bath temperature.
- the test sample was analyzed to determine what later additions would be required to adjust the chemistry, and the bath temperature was found to be 3,080 F.
- the sample was found to contain 0.009 percent carbon, 0.58 percent manganese, 0.03 percent phosphorus, 0.014 percent sulfur, 18.4 percent chromium, 9.38 percent nickel and 0.08 percent silicon.
- a refining slag consisting of 2,500 lbs of burnt lime, 300 lbs of fluorspar and 250 lbs of 50 percent ferrosilicon, was then added to the vessel; and the vessel was rotated to the vertical position and stirred with argon to fuse the slag.
- the refining slag was added to further reduce the sulfur content of the metal.
- the vessel was again tilted and 1,380 lbs of electrolytic manganese was added to bring the metal within the specifications.
- the bath temperature was again measured and found to be 2,930 F and the vessel was further stirred with argon to insure that the manganese addition was uniformly distributed.
- the vessel was then tilted again and deslagged, rotated to the vertical position, covered and evacuated to aid in decreasing the temperature of the bath and finally tapped into a teeming ladle.
- the final chemistry of the metal was found to be 0.007 percent carbon, 1.58 percent managanese, 0.03 percent phosphorus, 0.009 percent sulfur, 18.32 percent chromium, 9.28 percent nickel and 0.48 percent silicon.
- a process for producing stainless steel comprising:
- the inert gas comprises argon introduced at a rate of about 5-100 scfm.
- the final pressure in said converter is at most 20 mm Hg absolute.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Priority Applications (12)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00370904A US3854932A (en) | 1973-06-18 | 1973-06-18 | Process for production of stainless steel |
AU68709/74A AU6870974A (en) | 1973-06-18 | 1974-05-08 | Production of stainless steel |
FR7417709A FR2233401B1 (pt) | 1973-06-18 | 1974-05-21 | |
CA200,538A CA1017951A (en) | 1973-06-18 | 1974-05-22 | Process for production of stainless steel |
BE144678A BE815451A (fr) | 1973-06-18 | 1974-05-22 | Procede de fabrication d'acier inoxydable au convertisseur a oxygene |
ES426785A ES426785A1 (es) | 1973-06-18 | 1974-05-30 | Procedimiento de produccion de acero inoxidable. |
JP49063302A JPS5839885B2 (ja) | 1973-06-18 | 1974-06-04 | フシユウコウノセイゾウホウホウ |
IT51417/74A IT1013389B (it) | 1973-06-18 | 1974-06-06 | Procedimento per la produzione di acciaio inossicabile |
DE2428465A DE2428465C2 (de) | 1973-06-18 | 1974-06-12 | Verfahren zum Herstellen von rostfreiem Stahl |
GB2667174A GB1451013A (en) | 1973-06-18 | 1974-06-17 | Process for production of stainless steel |
BR4909/74A BR7404909D0 (pt) | 1973-06-18 | 1974-06-17 | Processo para produzir aco inoxidavel |
SE7408052A SE424448B (sv) | 1973-06-18 | 1974-06-18 | Forfarande for framstellning av rostfritt stal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00370904A US3854932A (en) | 1973-06-18 | 1973-06-18 | Process for production of stainless steel |
Publications (1)
Publication Number | Publication Date |
---|---|
US3854932A true US3854932A (en) | 1974-12-17 |
Family
ID=23461664
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00370904A Expired - Lifetime US3854932A (en) | 1973-06-18 | 1973-06-18 | Process for production of stainless steel |
Country Status (12)
Country | Link |
---|---|
US (1) | US3854932A (pt) |
JP (1) | JPS5839885B2 (pt) |
AU (1) | AU6870974A (pt) |
BE (1) | BE815451A (pt) |
BR (1) | BR7404909D0 (pt) |
CA (1) | CA1017951A (pt) |
DE (1) | DE2428465C2 (pt) |
ES (1) | ES426785A1 (pt) |
FR (1) | FR2233401B1 (pt) |
GB (1) | GB1451013A (pt) |
IT (1) | IT1013389B (pt) |
SE (1) | SE424448B (pt) |
Cited By (71)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3953199A (en) * | 1973-02-12 | 1976-04-27 | Vereinigte Osterreichische Eisenund Stahlwerke | Process for refining pig iron |
US3960546A (en) * | 1974-05-22 | 1976-06-01 | United States Steel Corporation | Method for eliminating nose-skulls from steelmaking vessels |
US4002467A (en) * | 1974-01-30 | 1977-01-11 | Verfahrenstechnik Dr.-Ing. Kurt Baum | Method for recovering reaction gases from steel converters which are bottom blown with oxygen and cooled with hydrocarbons |
US4004920A (en) * | 1975-05-05 | 1977-01-25 | United States Steel Corporation | Method of producing low nitrogen steel |
US4057421A (en) * | 1974-10-22 | 1977-11-08 | Sumitomo Metal Industries Limited | Process for vacuum decarburization of steel |
US4071356A (en) * | 1976-11-24 | 1978-01-31 | Nippon Steel Corporation | Method for refining a molten steel in vacuum |
US4081270A (en) * | 1977-04-11 | 1978-03-28 | Union Carbide Corporation | Renitrogenation of basic-oxygen steels during decarburization |
US4089677A (en) * | 1976-05-28 | 1978-05-16 | British Steel Corporation | Metal refining method and apparatus |
US4141723A (en) * | 1976-09-20 | 1979-02-27 | Institut De Recherches De La Siderurgie Francaise (Irsid) | Process for producing stainless steel |
US4160664A (en) * | 1977-01-25 | 1979-07-10 | Nisshin Steel Co. Ltd. | Process for producing ultra-low carbon stainless steel |
US4168158A (en) * | 1977-12-08 | 1979-09-18 | Kawasaki Steel Corporation | Method for producing alloy steels having a high chromium content and an extremely low carbon content |
US4170467A (en) * | 1977-01-31 | 1979-10-09 | Kawasaki Steel Corporation | Method for producing high chromium steels having extremely low carbon and nitrogen contents |
US4174212A (en) * | 1978-03-10 | 1979-11-13 | A. Finkl & Sons Co. | Method for the refining of steel |
US4178173A (en) * | 1977-08-22 | 1979-12-11 | Fried. Krupp Huttenwerke Aktiengesellschaft | Process for producing stainless steels |
US4218241A (en) * | 1977-08-03 | 1980-08-19 | Gottfried Bischoff Bau Kompl. Gasreinigungs- Und Wasserruckkuhlanlagen Gmbh & Co. Kommanditgesellschaft | Method of recovering energy from converter exhaust gases |
JPS55158213A (en) * | 1979-05-29 | 1980-12-09 | Daido Steel Co Ltd | Pefining method of chromium containing steel |
US4239190A (en) * | 1978-05-16 | 1980-12-16 | Verfahrenstechnik Dr. Ing. Kurt Baum | Structure for collecting exhaust gases from a converter |
DE3029343A1 (de) * | 1979-08-02 | 1981-02-26 | Nippon Kokan Kk | Konverter-stahlherstellungsverfahren |
US4279642A (en) * | 1980-04-01 | 1981-07-21 | Medovar Boris I | Method for electroslag remelting of metals |
US4280838A (en) * | 1979-05-24 | 1981-07-28 | Sumitomo Metal Industries, Ltd. | Production of carbon steel and low-alloy steel with bottom blowing basic oxygen furnace |
US4290802A (en) * | 1979-07-03 | 1981-09-22 | Sumitomo Metal Industries, Ltd. | Steel making process |
US4292073A (en) * | 1979-07-03 | 1981-09-29 | Sumitomo Metal Industries, Inc. | Steel making process |
US4302244A (en) * | 1980-07-18 | 1981-11-24 | Pennsylvania Engineering Corporation | Steel conversion method |
US4325730A (en) * | 1979-11-07 | 1982-04-20 | Arbed S.A. | Process for conditioning slag during the refining of a metal bath |
US4328030A (en) * | 1979-05-24 | 1982-05-04 | Sumitomo Metal Industries, Ltd. | Steel making process and apparatus |
US4328031A (en) * | 1979-12-28 | 1982-05-04 | Creusot-Loire | Method of mixed blowing for refining metals in a converter |
US4334921A (en) * | 1979-04-16 | 1982-06-15 | Nippon Steel Corporation | Converter steelmaking process |
US4348227A (en) * | 1979-08-07 | 1982-09-07 | Eisenwerk-Gesellschaft Maximilianshutte Mbh | Process for producing steel with low hydrogen content in a through-blowing oxygen converter |
US4349382A (en) * | 1979-04-30 | 1982-09-14 | Arbed S.A. | Process for refining of a bath of metal containing cold solid substances |
US4353533A (en) * | 1980-02-18 | 1982-10-12 | Kawasaki Steel Corporation | Bottom tuyeres in an oxygen top-blown converter |
US4356035A (en) * | 1979-12-11 | 1982-10-26 | Eisenwerk-Gesellschaft Maximilianshutte | Steelmaking process |
US4358314A (en) * | 1980-09-03 | 1982-11-09 | British Steel Corporation | Metal refining process |
US4369060A (en) * | 1980-01-09 | 1983-01-18 | Arbed S.A. | Process of refining of a metal bath in a crucible with oxygen blast at the top and crucible used |
US4397684A (en) * | 1981-03-11 | 1983-08-09 | Institut De Recherches De La Siderurgie Francaise Irsid | Process for pneumatic stirring of a bath of molten metal |
US4397685A (en) * | 1982-03-26 | 1983-08-09 | Union Carbide Corporation | Production of ultra low carbon steel by the basic oxygen process |
US4398949A (en) * | 1980-12-18 | 1983-08-16 | Kabushiki Kaisha Kobe Seiko Sho | Method for stably refining high carbon steel |
US4410359A (en) * | 1982-09-03 | 1983-10-18 | Allegheny Ludlum Steel Corporation | Process for production of stainless steel |
US4411697A (en) * | 1981-06-19 | 1983-10-25 | British Steel Corporation | Metal refining processes |
US4415359A (en) * | 1981-03-30 | 1983-11-15 | Nippon Steel Corporation | Multi-step steelmaking refining method |
US4417719A (en) * | 1982-08-10 | 1983-11-29 | Kawasaki Steel Corporation | Top-and-bottom blown converter |
US4420334A (en) * | 1980-09-19 | 1983-12-13 | Kawasaki Steel Corporation | Method for controlling the bottom-blowing gas in top-and-bottom blown converter steel making |
US4431443A (en) * | 1982-12-17 | 1984-02-14 | Wentzell Joseph M | Methods of vacuum arc melting |
US4436553A (en) | 1982-01-22 | 1984-03-13 | Union Carbide Corporation | Process to produce low hydrogen steel |
US4439234A (en) * | 1982-02-17 | 1984-03-27 | Arbed S.A. | Method of increasing the cold material charging capacity in the top-blowing production of steel |
US4443252A (en) * | 1982-03-26 | 1984-04-17 | Hoogovens Groep B.V. | Process for producing steel in a converter from pig iron and ferrous scrap |
US4445933A (en) * | 1981-11-30 | 1984-05-01 | Daido Tokushuko Kabushiki Kaisha | Method of refining molten steel |
US4474605A (en) * | 1981-03-03 | 1984-10-02 | Sumitomo Metal Industries, Ltd. | Process for refining high-chromium steels |
US4488903A (en) * | 1984-03-14 | 1984-12-18 | Union Carbide Corporation | Rapid decarburization steelmaking process |
FR2551089A1 (fr) * | 1983-08-26 | 1985-03-01 | Lenin Kohaszati Muvek | Procede de fabrication d'aciers a faible teneur en carbone par reglage du point de decarburation et de la temperature de soufflage |
US4514220A (en) * | 1984-04-26 | 1985-04-30 | Allegheny Ludlum Steel Corporation | Method for producing steel in a top-blown vessel |
US4517015A (en) * | 1983-02-12 | 1985-05-14 | Daido Tokushuko Kabushiki Kaisha | Steel refining method |
US4529442A (en) * | 1984-04-26 | 1985-07-16 | Allegheny Ludlum Steel Corporation | Method for producing steel in a top oxygen blown vessel |
US4565574A (en) * | 1984-11-19 | 1986-01-21 | Nippon Steel Corporation | Process for production of high-chromium alloy by smelting reduction |
US4592778A (en) * | 1983-09-14 | 1986-06-03 | Kawasaki Steel Company | Steelmaking of an extremely low carbon steel in a converter |
US4596600A (en) * | 1984-03-02 | 1986-06-24 | Kawasaki Steel Corporation | Steel-making process in converter |
US4599107A (en) * | 1985-05-20 | 1986-07-08 | Union Carbide Corporation | Method for controlling secondary top-blown oxygen in subsurface pneumatic steel refining |
US4647306A (en) * | 1984-07-20 | 1987-03-03 | Klockner Cra Technologie Gmbh | Process for the treatment of metal melts with scavenging gas |
US4650517A (en) * | 1985-05-29 | 1987-03-17 | Nippon Kokan Kabushiki Kaisha | Method of heating molten steel by arc process |
EP0222397A2 (en) * | 1985-11-13 | 1987-05-20 | Nippon Kokan Kabushiki Kaisha | Method for melting and reducing chrome ore |
US4792352A (en) * | 1986-01-20 | 1988-12-20 | Nippon Kokan Kabushiki Kaisha | Method for manufacturing steel through smelting reduction |
US4808220A (en) * | 1987-03-11 | 1989-02-28 | Thyssen Stahl Ag | Process for the preparation of refined ferromanganese |
US4919713A (en) * | 1988-02-24 | 1990-04-24 | Kawasaki Steel Corp. | Process for producing chromium containing molten iron |
US4927457A (en) * | 1987-02-02 | 1990-05-22 | Nippon Kokan Kabushiki Kaisha | Method of manufacturing low carbon ferro-chromium |
US4944799A (en) * | 1987-09-10 | 1990-07-31 | Nkk Corporation | Method of producing stainless molten steel by smelting reduction |
US5047081A (en) * | 1987-09-09 | 1991-09-10 | Nkk Corporation | Method of decarburizing high chromium molten metal |
US5112387A (en) * | 1991-08-21 | 1992-05-12 | Instituto Mexicano De Investigaciones Siderurgicas | Producing stainless steels in electric arc furnaces without secondary processing |
US5540753A (en) * | 1994-07-27 | 1996-07-30 | Nippon Steel Corporation | Method for refining chromium-containing molten steel by decarburization |
US5609669A (en) * | 1993-11-22 | 1997-03-11 | Brunner; Mikael | Method of manufacturing stainless steel |
US6162387A (en) * | 1997-02-28 | 2000-12-19 | Nippon Steel Corporation | Vacuum refining furnace |
US20130106035A1 (en) * | 2010-07-06 | 2013-05-02 | Shinagawa Refractories Co., Ltd. | Gas blowing nozzle |
CN115466815A (zh) * | 2022-09-27 | 2022-12-13 | 鞍钢股份有限公司 | 一种高碳钢控制氮含量方法 |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5394214A (en) * | 1977-01-31 | 1978-08-18 | Kawasaki Steel Co | Denitriding method of high chrome molten steel with small chrome loss |
BE873920A (fr) * | 1979-02-02 | 1979-05-29 | Centre Rech Metallurgique | Perfectionnements aux procede d'affinage de fonte au convertisseur |
JPS5565313A (en) * | 1978-11-13 | 1980-05-16 | Nippon Steel Corp | Steel manufacture with top blown oxygen |
FR2473064A1 (fr) * | 1980-01-02 | 1981-07-10 | Siderurgie Fse Inst Rech | Procede de brassage pneumatique d'un bain de metal en fusion |
JPS5757816A (en) * | 1980-09-19 | 1982-04-07 | Kawasaki Steel Corp | Steel making method by composite top and bottom blown converter |
DE3601337A1 (de) * | 1986-01-16 | 1987-07-23 | Mannesmann Ag | Verfahren zur herstellung hochlegierter staehle im sauerstoffblaskonverter |
DE3850381T2 (de) * | 1987-08-13 | 1994-10-20 | Nippon Kokan Kk | Ofen und verfahren zur reduktion eines chromvorproduktes durch schmelzen. |
JP2850407B2 (ja) * | 1989-04-18 | 1999-01-27 | 大同特殊鋼株式会社 | 含クロム溶鋼の精錬法 |
SE467828B (sv) * | 1991-01-31 | 1992-09-21 | Aga Ab | Saett att tillverka rostfritt staal |
CN1299308C (zh) * | 2004-07-30 | 2007-02-07 | 常熟开关制造有限公司(原常熟开关厂) | 自动转换开关的指示装置 |
DE102014201827A1 (de) * | 2013-11-27 | 2015-05-28 | Sms Siemag Ag | Verfahren zur Steuerung des Entkohlungsreaktionspotentials einer kohlenstoffhaltigen Metallschmelze während einer Sauerstoff-Inertgas-Blas- und Vakuumbehandlung |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3320053A (en) * | 1964-09-25 | 1967-05-16 | Bethlehem Steel Corp | Method of injecting gases into steel melts |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT237000B (de) * | 1962-09-18 | 1964-11-25 | Guszstahlwerk Witten Ag | Verfahren zur Herstellung von legiertem Stahl |
DE1758107B2 (de) * | 1968-04-04 | 1976-03-04 | Edelstahlwerk Witten Ag, 5810 Witten | Verfahren zum herstellen von rostfreien chrom- und chrom-nickel-staehlen |
US3507642A (en) * | 1969-06-02 | 1970-04-21 | Allegheny Ludlum Steel | Process for producing corrosion resistant steel |
US3724830A (en) * | 1969-08-15 | 1973-04-03 | Joslyn Mfg & Supply Co | Molten metal reactor vessel |
DE2007373B2 (de) * | 1970-02-18 | 1973-05-03 | Eisenwerk-Gesellschaft Maximilianshütte mbH, 8458 Sulzbach-Rosenberg | Verfahren und konverter zum herstellen ferritischer chromstaehle |
JPS504602B2 (pt) * | 1971-08-16 | 1975-02-21 |
-
1973
- 1973-06-18 US US00370904A patent/US3854932A/en not_active Expired - Lifetime
-
1974
- 1974-05-08 AU AU68709/74A patent/AU6870974A/en not_active Expired
- 1974-05-21 FR FR7417709A patent/FR2233401B1/fr not_active Expired
- 1974-05-22 BE BE144678A patent/BE815451A/xx not_active IP Right Cessation
- 1974-05-22 CA CA200,538A patent/CA1017951A/en not_active Expired
- 1974-05-30 ES ES426785A patent/ES426785A1/es not_active Expired
- 1974-06-04 JP JP49063302A patent/JPS5839885B2/ja not_active Expired
- 1974-06-06 IT IT51417/74A patent/IT1013389B/it active
- 1974-06-12 DE DE2428465A patent/DE2428465C2/de not_active Expired
- 1974-06-17 GB GB2667174A patent/GB1451013A/en not_active Expired
- 1974-06-17 BR BR4909/74A patent/BR7404909D0/pt unknown
- 1974-06-18 SE SE7408052A patent/SE424448B/xx unknown
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3320053A (en) * | 1964-09-25 | 1967-05-16 | Bethlehem Steel Corp | Method of injecting gases into steel melts |
Cited By (82)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3953199A (en) * | 1973-02-12 | 1976-04-27 | Vereinigte Osterreichische Eisenund Stahlwerke | Process for refining pig iron |
US4002467A (en) * | 1974-01-30 | 1977-01-11 | Verfahrenstechnik Dr.-Ing. Kurt Baum | Method for recovering reaction gases from steel converters which are bottom blown with oxygen and cooled with hydrocarbons |
US3960546A (en) * | 1974-05-22 | 1976-06-01 | United States Steel Corporation | Method for eliminating nose-skulls from steelmaking vessels |
US4057421A (en) * | 1974-10-22 | 1977-11-08 | Sumitomo Metal Industries Limited | Process for vacuum decarburization of steel |
US4004920A (en) * | 1975-05-05 | 1977-01-25 | United States Steel Corporation | Method of producing low nitrogen steel |
US4089677A (en) * | 1976-05-28 | 1978-05-16 | British Steel Corporation | Metal refining method and apparatus |
US4141723A (en) * | 1976-09-20 | 1979-02-27 | Institut De Recherches De La Siderurgie Francaise (Irsid) | Process for producing stainless steel |
US4071356A (en) * | 1976-11-24 | 1978-01-31 | Nippon Steel Corporation | Method for refining a molten steel in vacuum |
US4160664A (en) * | 1977-01-25 | 1979-07-10 | Nisshin Steel Co. Ltd. | Process for producing ultra-low carbon stainless steel |
US4170467A (en) * | 1977-01-31 | 1979-10-09 | Kawasaki Steel Corporation | Method for producing high chromium steels having extremely low carbon and nitrogen contents |
US4081270A (en) * | 1977-04-11 | 1978-03-28 | Union Carbide Corporation | Renitrogenation of basic-oxygen steels during decarburization |
US4218241A (en) * | 1977-08-03 | 1980-08-19 | Gottfried Bischoff Bau Kompl. Gasreinigungs- Und Wasserruckkuhlanlagen Gmbh & Co. Kommanditgesellschaft | Method of recovering energy from converter exhaust gases |
US4178173A (en) * | 1977-08-22 | 1979-12-11 | Fried. Krupp Huttenwerke Aktiengesellschaft | Process for producing stainless steels |
US4168158A (en) * | 1977-12-08 | 1979-09-18 | Kawasaki Steel Corporation | Method for producing alloy steels having a high chromium content and an extremely low carbon content |
US4174212A (en) * | 1978-03-10 | 1979-11-13 | A. Finkl & Sons Co. | Method for the refining of steel |
US4239190A (en) * | 1978-05-16 | 1980-12-16 | Verfahrenstechnik Dr. Ing. Kurt Baum | Structure for collecting exhaust gases from a converter |
US4334921A (en) * | 1979-04-16 | 1982-06-15 | Nippon Steel Corporation | Converter steelmaking process |
US4349382A (en) * | 1979-04-30 | 1982-09-14 | Arbed S.A. | Process for refining of a bath of metal containing cold solid substances |
US4280838A (en) * | 1979-05-24 | 1981-07-28 | Sumitomo Metal Industries, Ltd. | Production of carbon steel and low-alloy steel with bottom blowing basic oxygen furnace |
US4328030A (en) * | 1979-05-24 | 1982-05-04 | Sumitomo Metal Industries, Ltd. | Steel making process and apparatus |
US4272287A (en) * | 1979-05-29 | 1981-06-09 | Daido Tokushuko Kabushiki Kaisha | Process for refining molten steel containing chromium |
JPS55158213A (en) * | 1979-05-29 | 1980-12-09 | Daido Steel Co Ltd | Pefining method of chromium containing steel |
JPS5921367B2 (ja) * | 1979-05-29 | 1984-05-19 | 大同特殊鋼株式会社 | 含クロム鋼の精錬方法 |
US4290802A (en) * | 1979-07-03 | 1981-09-22 | Sumitomo Metal Industries, Ltd. | Steel making process |
US4292073A (en) * | 1979-07-03 | 1981-09-29 | Sumitomo Metal Industries, Inc. | Steel making process |
US4308057A (en) * | 1979-08-02 | 1981-12-29 | Nippon Kokan Kabushiki Kaisha | Steel making by converter |
DE3029343A1 (de) * | 1979-08-02 | 1981-02-26 | Nippon Kokan Kk | Konverter-stahlherstellungsverfahren |
US4348227A (en) * | 1979-08-07 | 1982-09-07 | Eisenwerk-Gesellschaft Maximilianshutte Mbh | Process for producing steel with low hydrogen content in a through-blowing oxygen converter |
US4345746A (en) * | 1979-11-07 | 1982-08-24 | Arbed S.A. | Apparatus for refining ferrous melt with slag conditioning |
US4325730A (en) * | 1979-11-07 | 1982-04-20 | Arbed S.A. | Process for conditioning slag during the refining of a metal bath |
US4356035A (en) * | 1979-12-11 | 1982-10-26 | Eisenwerk-Gesellschaft Maximilianshutte | Steelmaking process |
US4328031A (en) * | 1979-12-28 | 1982-05-04 | Creusot-Loire | Method of mixed blowing for refining metals in a converter |
US4369060A (en) * | 1980-01-09 | 1983-01-18 | Arbed S.A. | Process of refining of a metal bath in a crucible with oxygen blast at the top and crucible used |
US4353533A (en) * | 1980-02-18 | 1982-10-12 | Kawasaki Steel Corporation | Bottom tuyeres in an oxygen top-blown converter |
US4279642A (en) * | 1980-04-01 | 1981-07-21 | Medovar Boris I | Method for electroslag remelting of metals |
US4302244A (en) * | 1980-07-18 | 1981-11-24 | Pennsylvania Engineering Corporation | Steel conversion method |
US4358314A (en) * | 1980-09-03 | 1982-11-09 | British Steel Corporation | Metal refining process |
US4420334A (en) * | 1980-09-19 | 1983-12-13 | Kawasaki Steel Corporation | Method for controlling the bottom-blowing gas in top-and-bottom blown converter steel making |
US4398949A (en) * | 1980-12-18 | 1983-08-16 | Kabushiki Kaisha Kobe Seiko Sho | Method for stably refining high carbon steel |
US4474605A (en) * | 1981-03-03 | 1984-10-02 | Sumitomo Metal Industries, Ltd. | Process for refining high-chromium steels |
US4397684A (en) * | 1981-03-11 | 1983-08-09 | Institut De Recherches De La Siderurgie Francaise Irsid | Process for pneumatic stirring of a bath of molten metal |
US4415359A (en) * | 1981-03-30 | 1983-11-15 | Nippon Steel Corporation | Multi-step steelmaking refining method |
US4411697A (en) * | 1981-06-19 | 1983-10-25 | British Steel Corporation | Metal refining processes |
US4445933A (en) * | 1981-11-30 | 1984-05-01 | Daido Tokushuko Kabushiki Kaisha | Method of refining molten steel |
US4436553A (en) | 1982-01-22 | 1984-03-13 | Union Carbide Corporation | Process to produce low hydrogen steel |
US4439234A (en) * | 1982-02-17 | 1984-03-27 | Arbed S.A. | Method of increasing the cold material charging capacity in the top-blowing production of steel |
US4397685A (en) * | 1982-03-26 | 1983-08-09 | Union Carbide Corporation | Production of ultra low carbon steel by the basic oxygen process |
US4443252A (en) * | 1982-03-26 | 1984-04-17 | Hoogovens Groep B.V. | Process for producing steel in a converter from pig iron and ferrous scrap |
US4417719A (en) * | 1982-08-10 | 1983-11-29 | Kawasaki Steel Corporation | Top-and-bottom blown converter |
US4410359A (en) * | 1982-09-03 | 1983-10-18 | Allegheny Ludlum Steel Corporation | Process for production of stainless steel |
US4431443A (en) * | 1982-12-17 | 1984-02-14 | Wentzell Joseph M | Methods of vacuum arc melting |
US4517015A (en) * | 1983-02-12 | 1985-05-14 | Daido Tokushuko Kabushiki Kaisha | Steel refining method |
FR2551089A1 (fr) * | 1983-08-26 | 1985-03-01 | Lenin Kohaszati Muvek | Procede de fabrication d'aciers a faible teneur en carbone par reglage du point de decarburation et de la temperature de soufflage |
US4545815A (en) * | 1983-08-26 | 1985-10-08 | Lenin Kohaszati Muvek | Process for the production of steels of low carbon content wherein the carbon end point and blow temperature are controlled |
US4592778A (en) * | 1983-09-14 | 1986-06-03 | Kawasaki Steel Company | Steelmaking of an extremely low carbon steel in a converter |
US4596600A (en) * | 1984-03-02 | 1986-06-24 | Kawasaki Steel Corporation | Steel-making process in converter |
US4488903A (en) * | 1984-03-14 | 1984-12-18 | Union Carbide Corporation | Rapid decarburization steelmaking process |
US4514220A (en) * | 1984-04-26 | 1985-04-30 | Allegheny Ludlum Steel Corporation | Method for producing steel in a top-blown vessel |
EP0160376A2 (en) * | 1984-04-26 | 1985-11-06 | Allegheny Ludlum Corporation | Method for producing steel in a top oxygen blown vessel |
US4529442A (en) * | 1984-04-26 | 1985-07-16 | Allegheny Ludlum Steel Corporation | Method for producing steel in a top oxygen blown vessel |
EP0160376A3 (en) * | 1984-04-26 | 1989-07-26 | Allegheny Ludlum Steel Corporation | Method for producing steel in a top oxygen blown vessel |
US4647306A (en) * | 1984-07-20 | 1987-03-03 | Klockner Cra Technologie Gmbh | Process for the treatment of metal melts with scavenging gas |
US4565574A (en) * | 1984-11-19 | 1986-01-21 | Nippon Steel Corporation | Process for production of high-chromium alloy by smelting reduction |
US4599107A (en) * | 1985-05-20 | 1986-07-08 | Union Carbide Corporation | Method for controlling secondary top-blown oxygen in subsurface pneumatic steel refining |
US4650517A (en) * | 1985-05-29 | 1987-03-17 | Nippon Kokan Kabushiki Kaisha | Method of heating molten steel by arc process |
EP0222397A2 (en) * | 1985-11-13 | 1987-05-20 | Nippon Kokan Kabushiki Kaisha | Method for melting and reducing chrome ore |
US4783219A (en) * | 1985-11-13 | 1988-11-08 | Nippon Kokan Kabushiki Kaisha | Method for melting and reducing chrome ore |
EP0222397A3 (en) * | 1985-11-13 | 1989-06-07 | Nippon Kokan Kabushiki Kaisha | Method for melting and reducing chrome ore method for melting and reducing chrome ore |
US4792352A (en) * | 1986-01-20 | 1988-12-20 | Nippon Kokan Kabushiki Kaisha | Method for manufacturing steel through smelting reduction |
US4927457A (en) * | 1987-02-02 | 1990-05-22 | Nippon Kokan Kabushiki Kaisha | Method of manufacturing low carbon ferro-chromium |
US4808220A (en) * | 1987-03-11 | 1989-02-28 | Thyssen Stahl Ag | Process for the preparation of refined ferromanganese |
US5047081A (en) * | 1987-09-09 | 1991-09-10 | Nkk Corporation | Method of decarburizing high chromium molten metal |
US4944799A (en) * | 1987-09-10 | 1990-07-31 | Nkk Corporation | Method of producing stainless molten steel by smelting reduction |
US4919713A (en) * | 1988-02-24 | 1990-04-24 | Kawasaki Steel Corp. | Process for producing chromium containing molten iron |
US5112387A (en) * | 1991-08-21 | 1992-05-12 | Instituto Mexicano De Investigaciones Siderurgicas | Producing stainless steels in electric arc furnaces without secondary processing |
US5609669A (en) * | 1993-11-22 | 1997-03-11 | Brunner; Mikael | Method of manufacturing stainless steel |
US5540753A (en) * | 1994-07-27 | 1996-07-30 | Nippon Steel Corporation | Method for refining chromium-containing molten steel by decarburization |
US6162387A (en) * | 1997-02-28 | 2000-12-19 | Nippon Steel Corporation | Vacuum refining furnace |
US20130106035A1 (en) * | 2010-07-06 | 2013-05-02 | Shinagawa Refractories Co., Ltd. | Gas blowing nozzle |
US9109838B2 (en) * | 2010-07-06 | 2015-08-18 | Shinagawa Refractories Co., Ltd. | Gas blowing nozzle |
CN115466815A (zh) * | 2022-09-27 | 2022-12-13 | 鞍钢股份有限公司 | 一种高碳钢控制氮含量方法 |
CN115466815B (zh) * | 2022-09-27 | 2023-07-14 | 鞍钢股份有限公司 | 一种高碳钢控制氮含量方法 |
Also Published As
Publication number | Publication date |
---|---|
CA1017951A (en) | 1977-09-27 |
FR2233401B1 (pt) | 1978-10-27 |
GB1451013A (en) | 1976-09-29 |
IT1013389B (it) | 1977-03-30 |
BR7404909D0 (pt) | 1975-01-07 |
FR2233401A1 (pt) | 1975-01-10 |
JPS5839885B2 (ja) | 1983-09-02 |
ES426785A1 (es) | 1976-07-16 |
DE2428465C2 (de) | 1984-03-15 |
SE7408052L (pt) | 1974-12-19 |
JPS5022709A (pt) | 1975-03-11 |
SE424448B (sv) | 1982-07-19 |
BE815451A (fr) | 1974-11-22 |
AU6870974A (en) | 1975-11-13 |
DE2428465A1 (de) | 1975-01-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3854932A (en) | Process for production of stainless steel | |
US3953199A (en) | Process for refining pig iron | |
US3796421A (en) | Process for producing chrome steels and a converter for carrying out the process | |
US2993780A (en) | Method for treating steel in vacuo | |
US3703279A (en) | Reactor | |
US3761242A (en) | Method of treating molten metal by gas purging rhtough a porous plug | |
US2848317A (en) | Desulfurizing of steel | |
US3282679A (en) | Production of alloy steel | |
US2800631A (en) | Method of carrying out melting processes | |
US3672869A (en) | Continuous metallurgical process | |
GB2281312A (en) | Process for decarburizing carbon-containing molten metal | |
EP0061749B1 (en) | A multi-step steelmaking refining method | |
EP0033780B2 (en) | Method for preventing slopping during subsurface pneumatic refining of steel | |
EP0355163A1 (en) | Process for producing molten stainless steel | |
SU648118A3 (ru) | Способ получени легированных сталей | |
US2811436A (en) | Process of producing steel | |
JP2767674B2 (ja) | 高純度ステンレス鋼の精錬方法 | |
US4410359A (en) | Process for production of stainless steel | |
US3782921A (en) | Production of steel with a controlled phosphorus content | |
US3800630A (en) | Procedure and installation for continuous steel making | |
US4415359A (en) | Multi-step steelmaking refining method | |
NO830528L (no) | Fremgangsmaate for aa kunne oeke tilfoerselsmengden av kjoelematerialer ved fremstilling av staal | |
SU1675340A1 (ru) | Способ выплавки рельсовой стали в кислородном конвертере | |
RU1605524C (ru) | Способ производства коррозионно-стойкой стали | |
JPS6010087B2 (ja) | 鋼の精練法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ALLEGHENY LUDLUM CORPORATION Free format text: CHANGE OF NAME;ASSIGNOR:ALLEGHENY LUDLUM STEEL CORPORATION;REEL/FRAME:004779/0642 Effective date: 19860805 |
|
AS | Assignment |
Owner name: PITTSBURGH NATIONAL BANK Free format text: SECURITY INTEREST;ASSIGNOR:ALLEGHENY LUDLUM CORPORATION;REEL/FRAME:004855/0400 Effective date: 19861226 |
|
AS | Assignment |
Owner name: PITTSBURGH NATIONAL BANK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. RECORDED ON REEL 4855 FRAME 0400;ASSIGNOR:PITTSBURGH NATIONAL BANK;REEL/FRAME:005018/0050 Effective date: 19881129 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES) |