US3826647A - Method of obtaining low-phosphorus contents in medium-and high-carbon steels in a bottom-blown oxygen steelmaking furnace - Google Patents
Method of obtaining low-phosphorus contents in medium-and high-carbon steels in a bottom-blown oxygen steelmaking furnace Download PDFInfo
- Publication number
- US3826647A US3826647A US00306138A US30613872A US3826647A US 3826647 A US3826647 A US 3826647A US 00306138 A US00306138 A US 00306138A US 30613872 A US30613872 A US 30613872A US 3826647 A US3826647 A US 3826647A
- Authority
- US
- United States
- Prior art keywords
- lime
- oxygen
- blow
- rate
- carbon
- 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 abstract description 41
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title abstract description 38
- 229910052760 oxygen Inorganic materials 0.000 title abstract description 38
- 239000001301 oxygen Substances 0.000 title abstract description 38
- 229910052698 phosphorus Inorganic materials 0.000 title abstract description 29
- 239000011574 phosphorus Substances 0.000 title abstract description 29
- 229910000975 Carbon steel Inorganic materials 0.000 title abstract description 7
- 238000009628 steelmaking Methods 0.000 title description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 42
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 42
- 239000004571 lime Substances 0.000 abstract description 42
- 229910000831 Steel Inorganic materials 0.000 abstract description 26
- 239000010959 steel Substances 0.000 abstract description 26
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 23
- 238000007664 blowing Methods 0.000 abstract description 20
- 230000008569 process Effects 0.000 abstract description 16
- 230000009467 reduction Effects 0.000 abstract description 8
- 230000003247 decreasing effect Effects 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 abstract description 3
- 238000007670 refining Methods 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 25
- 229910052799 carbon Inorganic materials 0.000 description 25
- 229910000805 Pig iron Inorganic materials 0.000 description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 10
- 239000007787 solid Substances 0.000 description 9
- 239000002893 slag Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 235000000396 iron Nutrition 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009618 Bessemer process Methods 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241000042032 Petrocephalus catostoma Species 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 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
- -1 percent min. Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon 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
- 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
- C21C5/34—Blowing through the bath
-
- 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
Definitions
- a new basic-steelmaking process is beginning to receive considerable attention in the United States.
- this new process utilizes a combination of an oxygen blow and a lime-containing basic slag to remove impurities from molten pig iron.
- this new process blow oxygen through tuyeres located below the surface of the molten metal.
- the tuyeres are located in the bottom of the vessel, in a manner similar to that of the Bessemer process.
- a similar tuyere system is employed in the side of the vessel or hearth. Combinations of these embodiments may also be employed.
- these new tuyeres are comprised of a generally concentric tube system in which the central tuyere is employed for the oxygen stream.
- Each oxygen tuyere is surrounded by a larger tuyere for the simultaneous injection of a protective coolant fluid which serves to jacket the oxygen stream.
- This jacket 'fluid may be natural gas, other hydrocarbon containing liquids or gases or in some instances relatively non-reactive type gases such as argon, ammonia or carbon monoxide.
- the jacket fluid acts as a coolant, reducing the rate of reaction between the molten metal and oxygen adjacent the tuyere and thereby preventing the rapid erosion of both the tuyere itself and the adjacent refractory.
- the term bottom blown process will therefore include all processes in which at least one tuyere system is located between the surface of the molten steel.
- lime powder is entrained in the oxygen stream and blown into the bath to flux the oxidized impurities.
- it is conventional (in European practice) to provide an extensive oxygen blow and thereby decrease the carbon to a rather low residual level. Thus, if it is desirable to produce a.
- the bottom blow processes achieve substantially enhanced mixing during the blow, hence equilibrium conditions are more closely approached. While this is beneficial in improving the yield (substantially less iron oxide in the slag), the amount of phosphorus in the bath at the end of the blow is considerably greater. Thus, in the bottom blown process, phosphorus has only been substantially removed (i.e. greater than about reduction) after the carbon has been reduced to rather low levels.
- the above-mentioned benefits of catch carbon" practice have not been available to the art in many instances. For example, in utilizing pig irons with phosphorus contents in excess of about 0.14%, the production of a steel with phosphorus below about 0.025% has not been readily achievable. Similarly, even with pig irons with low initial phosphorus contents (e.g. 0.04 to 0.06% it is often desirable to produce a steel with only about 0.005 to 0.01% phosphorus.
- FIGS. 1 through 9 are graphical representations of the lime load patterns employed in the examples of Table I.
- the end-point temperature of the metal bath be kept within rather specific limits.
- the desired end-point temperature is primarily dependent of the final, desired carbon level of the steel. Methods for controlling the end-point temperature, such as by proper control of charge (e.g. hot metal to scrap ratio) are well known to the art. Therefore consistent with good pouring practice, the end-point temperature (T should not exceed that given by the following equation:
- T F. 2940100(C)
- Example 9 is illustrative of a further preferred embodiment of the invention, in which finely divided iron oxide was simultaneously injected together with the lime during final portion of the blow, preferably during the final 25% of the period.
- the patterns employed in Examples 5, 7 and 8 are illustrative of particularly preferred embodiments of the instant invention, wherein the lime load rate for about the last 40% of the blowing period is equal to or greater than about 1.5 times that of L A number of other modifications of the prescribed practice may also be employed.
- the sulfur content of the pig iron is high, i.e., greater than 0.05%, it may be desirable to employ a comparative high lime load rate (i.e., greater than L during about the first 25% of the blow.
- Desulfurization is favored by reducing condi- TABLE I.HEAT DATA Steel Pig iron (liquid) Blowing Lime percent time, loading, Composition, percent min., Oxygen, lbs./ Temp,
- Example number Charge materials, lbs. I S Si percent s.c.t'.m. s.e.f. Oz 0 P S Si F 1 58,300 liq. pig iron 0. 23 1 O. 048 0.79 8 (60) 3, 000 0. 11
- tions which are present when the silicon content of the metal bath is high, i.e., during about the first 25% of the period. If a high lime load is, in fact, employed during the first 25% of the blow, say 0.15 lbs./ft. it is nevertheless essential that the average for the first 50% of the blow be within the prescribed practice. Thus, a lime load of, for example, 0.04 lbs./ft. could be employed for the second 25% of the blowing period.
- the lime for any period was injected at a constant rate, i.e. the slope of the patterns shown in the figures is zero.
- the invention is not limited to the use of such zero slope load patterns.
- the lime may also be added at an increasing rate (positive slope) or at a decreasing rate (negative slope). It is only essential for purposes of this invention that the area under the curve for the whole blow, provide an average lime load rate L,
- the improvement which comprises adding said lime at a rate to achieve an overall lime load rate L of 0.09 to 0.16 pounds of lime per ft. of oxygen, wherein the average lime load rate for the first half of the blowing period L is at least 10 percent less than L and the average lime load rate for the second half of the blowing period L is at least 10 percent greater than L and controlling the end-point temperature of said refined molten steel so that it does not exceed that given by the equation:
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Priority Applications (16)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE792124D BE792124A (fr) | 1971-12-06 | Procede de fabrication d'acier | |
US00306138A US3826647A (en) | 1971-12-06 | 1972-11-13 | Method of obtaining low-phosphorus contents in medium-and high-carbon steels in a bottom-blown oxygen steelmaking furnace |
IT32465/72A IT982369B (it) | 1971-12-06 | 1972-12-04 | Metodo per ottenere bassi contenu ti di fosforo in acciai a medio e alto tenore di carbonio in un forno per la fabbricazione di acciaio con ossigeno insuffiato dal basso |
LU66599A LU66599A1 (fr) | 1971-12-06 | 1972-12-05 | |
GB5611072A GB1415535A (en) | 1971-12-06 | 1972-12-05 | Method of obtaining low-phosphorous contents in mediu-and high-carbon steels in a bottom-blown oxygen steel-making furnace |
AR245481A AR198963A1 (es) | 1971-12-06 | 1972-12-05 | Metodo para obtener acero con bajo contenido de fosforo |
NL7216486A NL7216486A (fr) | 1971-12-06 | 1972-12-05 | |
SE7215839A SE407694B (sv) | 1971-12-06 | 1972-12-05 | Forfarande for framstellning av stal med lag fosforhalt |
PL15930972A PL79118B1 (fr) | 1972-11-13 | 1972-12-05 | |
CA158,066A CA974774A (en) | 1971-12-06 | 1972-12-05 | Method of obtaining low-phosphorus contents in medium-and high-carbon steels in a bottom-blown oxygen steelmaking furnace |
TR17930A TR17930A (tr) | 1971-12-06 | 1972-12-05 | Dipten ueflenen bir oksijenle celik yapi mi firininda orta-ve yueksek-karbon celiklerinde alcak-fosfor muhtevasi elde etme usulue |
ES409323A ES409323A1 (es) | 1971-12-06 | 1972-12-05 | Procedimiento de inyeccion por el fondo para el refino de hierro fundido. |
FR7243249A FR2162461B1 (fr) | 1971-12-06 | 1972-12-05 | |
DE2259533A DE2259533A1 (de) | 1971-12-06 | 1972-12-05 | Bodenblasendes frischverfahren |
DD167322A DD102164A5 (fr) | 1971-12-06 | 1972-12-06 | |
JP12236072A JPS5545607B2 (fr) | 1971-12-06 | 1972-12-06 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US20535371A | 1971-12-06 | 1971-12-06 | |
US00306138A US3826647A (en) | 1971-12-06 | 1972-11-13 | Method of obtaining low-phosphorus contents in medium-and high-carbon steels in a bottom-blown oxygen steelmaking furnace |
Publications (1)
Publication Number | Publication Date |
---|---|
US3826647A true US3826647A (en) | 1974-07-30 |
Family
ID=26900357
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00306138A Expired - Lifetime US3826647A (en) | 1971-12-06 | 1972-11-13 | Method of obtaining low-phosphorus contents in medium-and high-carbon steels in a bottom-blown oxygen steelmaking furnace |
Country Status (15)
Country | Link |
---|---|
US (1) | US3826647A (fr) |
JP (1) | JPS5545607B2 (fr) |
AR (1) | AR198963A1 (fr) |
BE (1) | BE792124A (fr) |
CA (1) | CA974774A (fr) |
DD (1) | DD102164A5 (fr) |
DE (1) | DE2259533A1 (fr) |
ES (1) | ES409323A1 (fr) |
FR (1) | FR2162461B1 (fr) |
GB (1) | GB1415535A (fr) |
IT (1) | IT982369B (fr) |
LU (1) | LU66599A1 (fr) |
NL (1) | NL7216486A (fr) |
SE (1) | SE407694B (fr) |
TR (1) | TR17930A (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4987086A (en) * | 1987-11-30 | 1991-01-22 | Becton, Dickinson And Company | Method for analysis of subpopulations of cells |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5743919A (en) * | 1980-08-30 | 1982-03-12 | Kawasaki Steel Corp | Method for blow refining in top and/or bottom-blown converter |
JPS57140810A (en) * | 1981-02-23 | 1982-08-31 | Nippon Steel Corp | Refining method for steel |
JPS6284354U (fr) * | 1985-11-14 | 1987-05-29 | ||
JPS62111761U (fr) * | 1986-01-07 | 1987-07-16 |
-
0
- BE BE792124D patent/BE792124A/fr unknown
-
1972
- 1972-11-13 US US00306138A patent/US3826647A/en not_active Expired - Lifetime
- 1972-12-04 IT IT32465/72A patent/IT982369B/it active
- 1972-12-05 NL NL7216486A patent/NL7216486A/xx not_active Application Discontinuation
- 1972-12-05 FR FR7243249A patent/FR2162461B1/fr not_active Expired
- 1972-12-05 DE DE2259533A patent/DE2259533A1/de active Pending
- 1972-12-05 SE SE7215839A patent/SE407694B/xx unknown
- 1972-12-05 CA CA158,066A patent/CA974774A/en not_active Expired
- 1972-12-05 GB GB5611072A patent/GB1415535A/en not_active Expired
- 1972-12-05 LU LU66599A patent/LU66599A1/xx unknown
- 1972-12-05 TR TR17930A patent/TR17930A/xx unknown
- 1972-12-05 AR AR245481A patent/AR198963A1/es active
- 1972-12-05 ES ES409323A patent/ES409323A1/es not_active Expired
- 1972-12-06 DD DD167322A patent/DD102164A5/xx unknown
- 1972-12-06 JP JP12236072A patent/JPS5545607B2/ja not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4987086A (en) * | 1987-11-30 | 1991-01-22 | Becton, Dickinson And Company | Method for analysis of subpopulations of cells |
Also Published As
Publication number | Publication date |
---|---|
ES409323A1 (es) | 1976-03-16 |
BE792124A (fr) | 1973-03-16 |
FR2162461B1 (fr) | 1977-01-14 |
NL7216486A (fr) | 1973-06-08 |
TR17930A (tr) | 1976-11-01 |
JPS5545607B2 (fr) | 1980-11-19 |
LU66599A1 (fr) | 1973-02-08 |
CA974774A (en) | 1975-09-23 |
GB1415535A (en) | 1975-11-26 |
DD102164A5 (fr) | 1973-12-05 |
JPS4876715A (fr) | 1973-10-16 |
FR2162461A1 (fr) | 1973-07-20 |
SE407694B (sv) | 1979-04-09 |
AR198963A1 (es) | 1974-07-31 |
IT982369B (it) | 1974-10-21 |
DE2259533A1 (de) | 1973-06-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: USX CORPORATION, A CORP. OF DE, STATELESS Free format text: MERGER;ASSIGNOR:UNITED STATES STEEL CORPORATION (MERGED INTO);REEL/FRAME:005060/0960 Effective date: 19880112 |