EP0070526A1 - Verfahren zum Betrieben eines Auf- und Durchblaskonverters und Lanze hierfür - Google Patents
Verfahren zum Betrieben eines Auf- und Durchblaskonverters und Lanze hierfür Download PDFInfo
- Publication number
- EP0070526A1 EP0070526A1 EP82106377A EP82106377A EP0070526A1 EP 0070526 A1 EP0070526 A1 EP 0070526A1 EP 82106377 A EP82106377 A EP 82106377A EP 82106377 A EP82106377 A EP 82106377A EP 0070526 A1 EP0070526 A1 EP 0070526A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blowing
- converter
- lance
- molten metal
- axis
- 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.)
- Granted
Links
- 238000007664 blowing Methods 0.000 claims abstract description 117
- 239000002184 metal Substances 0.000 claims abstract description 67
- 229910052751 metal Inorganic materials 0.000 claims abstract description 67
- 239000007789 gas Substances 0.000 claims abstract description 55
- 230000005587 bubbling Effects 0.000 claims abstract description 41
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910001882 dioxygen Inorganic materials 0.000 claims abstract description 31
- 230000000630 rising effect Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 11
- 239000006185 dispersion Substances 0.000 claims description 3
- 229910052705 radium Inorganic materials 0.000 claims 1
- HCWPIIXVSYCSAN-UHFFFAOYSA-N radium atom Chemical compound [Ra] HCWPIIXVSYCSAN-UHFFFAOYSA-N 0.000 claims 1
- 238000002474 experimental method Methods 0.000 description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 11
- 239000001301 oxygen Substances 0.000 description 11
- 229910052760 oxygen Inorganic materials 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 230000001133 acceleration Effects 0.000 description 8
- 238000010079 rubber tapping Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005262 decarbonization Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000009628 steelmaking Methods 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
- C21C5/35—Blowing from above and through the bath
Definitions
- This invention relates to a method for operating a top-and-bottom blown converter, and a top-blowing lance used in the practice of a method for operating a top-and-bottom blowing converter.
- top-blown converters which are also referred to as LD converters often experience operating troubles due to the phenomenon that molten metal is ejected out of the converter, which is generally called slopping and attributable to excessive oxidation of molten metal by the top blowing oxygen gas.
- top-and-bottom blown converters were recently developed by taking advantage of the oxygen bottom blown converter and have been commercially used in iron works.
- the top-and-bottom blown converters are generally constructed by modifying existing top-blown converters. More specifically, referring to Fig.
- the top-blown converter is modified by providing a plurality of bottom blowing tuyeres 2 extending through a converter bottom 1 which is removably secured to a converter housing 7.
- a top-blowing lance 3 is vertically inserted through a top opening of the converter. With this arrangement, jets 4 of oxygen gas are blown through the top-blowing lance 3 onto the surface of a molten metal bath 6 while an agitating gas 5 such as oxygen gas or argon gas is blown into the molten metal bath 6 through the tuyeres 2.
- top-and-bottom blown converter is free of slopping since the molten metal is vigorously agitated by the bottom blowing gas to prevent the molten metal from being excessively oxidized with the top-blowing gas. Since top-and-bottom blown converters constructed by modifying LD converters, however, has a housing of a specific profile designed for the LD converter operation requiring top blowing only, the bottom blowing gas causes the molten metal to wave or vibrate and eventually, the converter housing to severely vibrate, resulting in a variety of troublesome problems.
- bottom-blowing tuyeres In order to minimize the above-mentioned vibration caused by the blowing of bottom-blowing gas, it is believed effective to locate bottom-blowing tuyeres remote from the center of the converter bottom and spaced apart from each other.
- a top-and-bottom blown converter which is constructed by modifying a top-blown converter, it is difficult to distribute the bottom-blowing tuyeres in a spaced-apart relationship because of the housing profile and other factors. It is known that the life of tuyeres is considerably shortened if the tuyeres are washed with molten metal, that is, alternately exposed to air and molten metal during charging and tapping of molten metal.
- the oxygen bottom-blown converter has a housing profile approximating a spherical shape, that is, a housing profile having a reduced ratio H/D of a housing height H to the maximum 0 of a housing inner diameter, such that the bulge of a converter barrel serves as a reservoir for molten metal when the converter housing is tilted for charging or tapping of molten metal. Then the bottom blowing tuyeres are prevented from being washed upon charging or tapping even when they are spaced apart from each other and from the axis of the converter.
- a top-and-bottom blown converter which is constructed by modifying a conventional top-blown converter maintains the housing profile as it is in the top-blown converter, that is, a vertically elongated profile approximating a rotary oval body having a less bulged barrel and an increased height-to-diameter ratio H/D. It should thus be precluded to tilt the modified converter over a too large angle for charging or tapping of molten metal.
- the bottom blowing tuyeres should be collectively arranged on or in proximitv of a line passing the axis of the converter and parallel to the trunnion axis to prevent the bottom-blowing tuyeres from being washed with the molten metal upon charging or tapping thereof.
- the location of bottom blowing tuyeres is limited in the top-and-bottom blown converter which is constructed by modifying a top-blown converter, it is very difficult in practice to reduce the vibration of a molten metal bath by arranging the bottom-blowing tuyeres in a spaced-apart relationship.
- a primary object of the present invention is to minimize vibration of a molten metal bath in a top-and-bottom blown converter to thereby diminish vibration of a converter housing.
- the location of hot spots created by oxygen gas from a top-blowing lance need not be limited to the proximity of the axis of the converter because agitation of a molten metal bath is improved over the top-blown converter, and more specifically, the molten metal is agitated with the bottom-blowing gas to such a full extent that the top-blowing oxygen gas need not assist in agitating the molten metal
- the vibration of molten metal is closely related to the relative location of the hot spots and the bottom-blowing gas bubbling region, and more specifically, the vibration of molten metal can be minimized by designing the top-blowing multi-nozzle lance such that a hot spot created by a jet of oxygen gas from each of the nozzles of the lance is located outside the bottom-blowing gas bubbling region, we have achieved the present invention.
- top-blown converters it is a common practice to blow oxygen gas onto the surface of molten metal through a top-blowing lance thereabove for the purpose of effecting desiliconization, decarbonization and dephosphorization.
- the top-blowing lance usually has a plurality of, for example, three or four nozzles.
- a typical top-blowing lance is shown in Fig. 1 as having four nozzles 8 whose axis is at a small angle of about 8° - 10° with respect to the axis of the lance 3.
- the angle of the nozzle axis with respect to the lance axis is referred to as nozzle inclination angle, hereinafter.
- a nozzle inclination angle on the order of 8° - 10° is generally used in a multi-nozzle lance for conventional top-blown converters for the following reason.
- the nozzle inclination angle be reduced to concentrate the associated oxygen jets within a relatively narrow region on the molten metal surface to allow the oxygen jets to impinge against the molten metal without dispersing their kinetic energy to reduce the kinetic energy per unit area.
- the concentrated energy causes the molten metal to be vigorously agitated.
- the nozzle inclination angle is desirably increased to cause part of the oxygen to be absorbed in a slag layer on the molten metal surface over a relatively large area.
- the nozzle inclination angle is determined as described above.
- the top-blowing lance is aligned with the axis of the converter for the purpose of rendering the molten metal reaction uniform and because of its location relative to the converter opening.
- the high temperature zones which are created on the molten metal surface by oxygen gas jets injected thereon through the top-blowing lance, that is, the so-called hot spots are located within a relatively narrow region which is confined around the axis of the converter on the basis of the nozzle inclination angle.
- top-and-bottom blown converters constructed by modifying top-blown converters actually use the same lance as used in the top-blown converters although metallurgical effect, particularly, molten metal agitating effect is apparently different therebetween.
- the hot spots created by the top blowing gas from the lance are generally located within a relatively narrow region extending about the axis of the converter as in the case of the top-blown converters.
- the bottom-blowing tuyeres in the modified type of top-and-bottom blown converter must be collectively arranged on or in proximity of a line passing the converter axis and parallel to the trunnion axis for the reason of tuyere life as described earlier.
- the hot spots P created by the top-blowing gas from the lance 3 are located within a bubbling region of the molten metal surface which rising bubbles of the bottom-blowing gas from the tuyeres 2 reach (bottom-blowing gas bubbling region) or the hot spots P largely overlap the bottom-blowing gas bubbling region as seen from Fig, 10.
- a conventional top-blowing lance was used in the top-and-bottom blown converter, it was difficult to locate the hot spots created by the gas from the top-blowing lance outside the bottom-blowing gas bubbling region.
- the present invention is concerned in a top-and-bottom blown converter comprising tuyeres arranged at the bottom for blowing a gas into a molten metal bath in the converter and a multi-nozzle lance inserted through a top opening of the converter for blowing jets of oxygen gas onto the bath surface.
- a method for operating the top-and-bottom blown converter wherein the top-blowing oxygen gas is blown such that the center of a hot spot created by the oxygen gas jet from each of the nozzles of the lance is positioned outside a bubbling region of the molten metal surface which rising bubbles of the bottom-blowing gas reach, thereby minimizing vibration of the molten metal bath.
- the coordinates (x, y) of the centers of at least four of the hot spots created on the molten metal surface by the oxygen gas jets from the nozzles of the top-blowing multi-nozzle lance fall within the range defined by the inequalities: wherein a is a diameter of the bubbling region in a direction parallel to the trunnion axis,
- a top-blowing lance for use in the operation of a top-and-bottom blown converter comprising a plurality of nozzles at the tip thereof.
- the nozzles are oriented such that the axis of each of the nozzles is at an angle between 20° and 30° with respect to the axis of the lance.
- a top-and-bottom blown converter 7 it is a common practice in a top-and-bottom blown converter 7 to arrange a plurality of tuyeres 2 at the bottom 1 in one or two rows on or in proximity of a line passing the axis of the converter and parallel to the axis 9 of trunnions supporting the converter for pivotal motion.
- the molten metal bath waves or vibrates mainly in a direction perpendicular to the tuyere aligning line as if water moved alternately in opposite directions in a U-shaped tube.
- a rotational vibration about the converter axis takes place additionally.
- the impact energy of the top-blowing oxygen gas jets might be used as an energy for overcoming the vibration of the molten metal bath, that is, a vibration damping or absorbing energy by changing the location of hot spots from the conventional arrangement, we made a model experiment using water under similar conditions as might occur in an actual top-and-bottom blown converter.
- the bubbling region which rising bubbles of the bottom-blowing gas reach may be defined as follows. Provided that H is a depth of the molten metal bath 6 and e is an angle of dispersion of an oxygen jet from each tuyere 2 as shown in Fig. 3, a bubbling zone of the molten metal surface that bubbles of the oxygen gas from each tuyere reach is horizontally and radially spread from the center vertically aligned with the tuyere over a radius d: Then, the gas bubbling region covering all the tuyeres may be given by horizontally expanding an envelope encircling the tuyeres outward over the distance d.
- an overall bottom-blowing gas bubbling region Q is shown in Fig. 2 as being defined by horizontally expanding an envelope encircling the vertical projections on a stationary molten metal surface of the tuyeres 2 over the distance d. It has also been empirically determined that the angle e of dispersion of the bottom-blowing gas jet is approximately 20° under normal conditions.
- a 1/10 scale water model that is, a converter model made to a scale of 1/10 of an actual top-and-bottom blown converter and using water instead of molten iron
- the magnitude of vibration (or acceleration) of the model housing was measured while the location of hot spots created by oxygen gas jets from the nozzles of a top-blowing four-nozzle lance was changed in relation to the above- defined bottom-blowing gas bubbling region.
- the depth of the bath was 170 mm
- the distance from the stationary bath surface to the opening end of the nozzles of the four-nozzle lance, that is, the nozzle height was 250 mm.
- origin 0 coincides with the axis of the converter
- axis x is a line passing the converter axis 0 and parallel to the trunnion axis
- axis y is a line passing the converter axis 0 and perpendicular to the trunnion axis
- a represents a longer diameter of the bottom-blowing gas bubbling region in a direction parallel to the trunnion axis
- b represents a shorter diameter of the bubbling region in a direction perpendicular to the trunnion axis.
- c represents a radius of a concave created by a jet from each lance nozzle, that is, a hot spot.
- a represents an angle obtained by projecting on plane x-z the angle between the axis of each nozzle and the axis of the four nozzle lance, wherein z represents a vertical axis extending from the origin 0 above the plane of the sheet of Fig.
- the vibration attenuation factor (%) is obtained by measuring the acceleration in a direction parallel to the trunnion axis at a trunnion support stand and comparing the measured value with the standard value which is measured when the vibration of a molten metal bath is solely caused by the bottom-blowing gas without blowing any gas onto the bath surface through the top-blowing lance.
- a and 8 may be given by the following equations: Accordingly, the optimum vibration attenuation is achieved by setting the projected inclination angles a and 0 of the lance nozzle to meet equations (5) and (6) in accordance with the lance height h as long as (x, y) satisfies equation (4).
- a top-and-bottom blown converter used was a modification of a 250-ton LD converter.
- Five four-nozzle lances having different nozzle inclination angles were prepared.
- a blowing experiment was done for each lance under the conditions that the lance height h was 2500 mm, the flow rate of bottom-blowing gas was 300 Nm 3 /min., the flow rate of oxygen through the top-blowing lance was 450 Nm 3 /min., and the average depth of a molten iron bath was 1700 mm.
- the magnitude of vibration or acceleration at a trunnion support stand was measured in a direction parallel to the trunnion axis.
- the positions of the centers of hot spots created by an oxygen gas jet from a nozzle of various lances are depicted at cross (x) signs referred to Nos. 11 - 15 in Fig. 6.
- the projected inclination angles a and ⁇ of a lance nozzle in directions of x and y axes and the vibration attenuation factor (%) corresponding to each of the hot spots are shown in Table 2.
- the meanings of x and y axes, a, b, c and Q in Fig. 6 are as defined in Fig. 4, and the vibration attenuation factor in Table 2 is as defined in Table 1.
- the hot spot center represented by a coordinate (x, y) may vary with the lance height h. This means that when a lance having nozzles with a given inclination angle is set at different lance heights, the hot spot centers also appear at different positions.
- the lance height h is previously set to a certain value, and the inclination angle of the lance nozzle is then determined in relation to the preset lance height such that the resultant hot spot centers may be outside the bottom-blowing gas bubbling region, and more preferably, the resultant hot spot centers may have a coordinate (x, y) satisfying the above-mentioned inequalities (4).
- a lance having nozzles with such a predetermined inclination angle must be used.
- the lance height h is often changed in response to varying conditions in the progress of an actual converter operation. If the lance height h is lowered during the operation, for example, the hot spot centers are inwardly moved to within a bottom-blowing gas bubbling region to undesirably enhance vibration.
- the preferred top-blowing multi-nozzle lances for use in the practice of the method of the present invention are those lances having oriented nozzles in which the angle included between the axes of each nozzle and the lance, that is, the nozzle inclination angle (angle ⁇ as depicted in Fig. 1) is from 20° to 30°, which value is remarkably larger than the previously used nozzle inclination angle of 8° - 10°.
- the nozzle inclination angle is from 20° to 30°, which value is remarkably larger than the previously used nozzle inclination angle of 8° - 10°.
- the resultant hot spot centers will possibly appear outside the bottom-blowing gas bubbling region under normal operating conditions in a commonly used top-and-bottom blown converter having a capacity of about 80 tons or more.
- the top-blowing oxygen gas jet is not expected to effect substantial decarbonization unlike the top-blown converter, and the lance height is often set at a higher value than in the top-blown converter, thereby providing a soft blow.
- the lance height is about 1500 mm or more. With the lance height of about 1500 mm, if the nozzle inclination angle ⁇ is at least 20°, the resultant hot spot centers will appear outside the bottom-blowing gas bubbling region to suppress vibration of a molten metal bath. In this manner, the bath vibration will be effectively suppressed even when the lance height h and other conditions are altered during the actual operation.
- nozzle inclination angle ⁇ exceeds 30°, there is the likelihood that oxygen gas be directly blown onto a refractory brick on the converter barrel during vertical movement of the top-blowing lance, causing wear or failure of the refractory brick.
- a multi-nozzle lance having a nozzle inclination angle between 20° and 30° is preferably used in the actual operation of a top-and-bottom blown converter.
- the oxygen flow rate through the top-blowing lance was 400 - 600 Nm 3 /min.
- the oxygen flow rate through the bottom-blowing tuyeres was 350 - 250 Nm 3 /rain.
- the top-blowing lance used was a four-nozzle lance having a throat diameter of 38 - 40 mm.
- the vibration of the converter housing is reduced to a substantially negligible level by setting the nozzle inclination angle ⁇ to 20° or more.
- Figs. 8 and 9 show the confines on the molten metal surface at which oxygen gas jets from the nozzles of the top-blowing lance impinge to create hot spots, in an example wherein the nozzle inclination angle is in the range between 20° and 30° and a comparative example wherein the nozzle inclination angle is less than 20°, respectively.
- blowing operation was carried out in a top-and-bottom blown converter equipped with bottom-blowing tuyeres arranged on a line parallel to the trunnion axis and a four-nozzle lance having a throat diameter of 42 mm and a nozzle inclination angle of 28°.
- the top-blowing oxygen gas flow rate was 560 Nm 3 /min. and the bottom-blowing gas flow rate was 370 Nm 3 /min.
- hot spots Pa - Pd were definitely outside the bottom-blowing gas bubbling region Q encircled by a broken line in Fig. 8.
- the acceleration measured at a trunnion support stand in a direction parallel to the trunnion axis was as small as 0.02 G (wherein G is the acceleration of gravity).
- G is the acceleration of gravity
- a blowing operation was carried out in the same manner as described for the example of Fig. 8 except that the nozzle inclination angle was 9.1°.
- hot spots Pa l - Pd' largely overlap the bottom-blowing gas bubbling region Q.
- the acceleration measured as above was 0.08 G.
- the method of the present invention for operating a top-and-bottom blown converter by blowing the top-blowing oxygen gas such that the center of a hot spot created by an oxygen gas jet from each of the nozzles of a top-blowing multi-nozzle lance is positioned outside a bubbling region of the molten metal surface which rising bubbles of the bottom-blowing gas reach has many advantages that vibration of a molten metal bath is significantly reduced as compared with the prior art, to thereby minimize vibration of the converter housing, and consequently, even a top-and-bottom blown converter of the type which is constructed by modifying an existing top-blown converter is unlikely to undergo fatigue failure at its housing support, blowing operation can be carried out in a stable manner, and the possible danger to the operators is minimized.
- the centers of hot spots created therewith can be positioned outside the bottom-blowing gas bubbling region, thereby ensuring the stable and effective operation of the converter.
- top-and-bottom blown converter which is constructed by modifying a top-blown converter
- present invention is also applicable to those converters constructed by adding a top-blowing lance to a bottom-blown converter.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11200381A JPS5816013A (ja) | 1981-07-17 | 1981-07-17 | 上底吹転炉の操業方法および上底吹転炉操業用上吹ランス |
| JP112003/81 | 1981-07-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0070526A1 true EP0070526A1 (de) | 1983-01-26 |
| EP0070526B1 EP0070526B1 (de) | 1987-04-08 |
Family
ID=14575517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP82106377A Expired EP0070526B1 (de) | 1981-07-17 | 1982-07-15 | Verfahren zum Betrieben eines Auf- und Durchblaskonverters und Lanze hierfür |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0070526B1 (de) |
| JP (1) | JPS5816013A (de) |
| DE (1) | DE3276008D1 (de) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107429303A (zh) * | 2015-03-30 | 2017-12-01 | 杰富意钢铁株式会社 | 顶底同吹转炉的操作方法 |
| CN115466814A (zh) * | 2022-08-30 | 2022-12-13 | 北京科技大学 | 一种提升熔池动力学特性的转炉及方法 |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59162488U (ja) * | 1983-04-18 | 1984-10-31 | 日本鋼管株式会社 | 海中貯油タンク |
| JPS60165313A (ja) * | 1984-02-07 | 1985-08-28 | Nippon Steel Corp | 溶融金属精錬用上吹ランス |
| JPS62262613A (ja) * | 1986-05-08 | 1987-11-14 | 日立電線株式会社 | ケ−ブル伸縮用均等動作機構 |
| CN103361463B (zh) * | 2012-03-31 | 2015-11-18 | 上海梅山钢铁股份有限公司 | 一种转炉内氧枪位置控制系统及方法 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2131345A1 (de) * | 1970-07-01 | 1972-01-13 | Ct Sperimentale Metallurg S P | Doppelauslass-Lanze zum Frischen von Stahl bei Konverter-Prozessen |
| DE3019899A1 (de) * | 1979-05-24 | 1980-12-04 | Sumitomo Metal Ind | Verfahren zur herstellung von kohlenstoffstahl und niedriglegiertem stahl in einem basischen sauerstoffofen und vorrichtung zur durchfuehrung des verfahrens |
| FR2476678A1 (fr) * | 1980-02-21 | 1981-08-28 | Siderurgie Fse Inst Rech | Procede et dispositif d'affinage de la fonte par soufflage d'oxygene |
| WO1982001012A1 (en) * | 1980-09-19 | 1982-04-01 | Kato Y | Method for smelting using top-and bottom-blown converter |
-
1981
- 1981-07-17 JP JP11200381A patent/JPS5816013A/ja active Pending
-
1982
- 1982-07-15 EP EP82106377A patent/EP0070526B1/de not_active Expired
- 1982-07-15 DE DE8282106377T patent/DE3276008D1/de not_active Expired
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2131345A1 (de) * | 1970-07-01 | 1972-01-13 | Ct Sperimentale Metallurg S P | Doppelauslass-Lanze zum Frischen von Stahl bei Konverter-Prozessen |
| DE3019899A1 (de) * | 1979-05-24 | 1980-12-04 | Sumitomo Metal Ind | Verfahren zur herstellung von kohlenstoffstahl und niedriglegiertem stahl in einem basischen sauerstoffofen und vorrichtung zur durchfuehrung des verfahrens |
| FR2476678A1 (fr) * | 1980-02-21 | 1981-08-28 | Siderurgie Fse Inst Rech | Procede et dispositif d'affinage de la fonte par soufflage d'oxygene |
| WO1982001012A1 (en) * | 1980-09-19 | 1982-04-01 | Kato Y | Method for smelting using top-and bottom-blown converter |
Non-Patent Citations (2)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN, Vol. 4, No. 101, 19 July 1980, page 161C19; & JP-A-55 065 313 * |
| PATENT ABSTRACTS OF JAPAN, Vol. 4, No. 140, 3 October 1980, page 161C26; & JP-A-55 091 912 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107429303A (zh) * | 2015-03-30 | 2017-12-01 | 杰富意钢铁株式会社 | 顶底同吹转炉的操作方法 |
| CN115466814A (zh) * | 2022-08-30 | 2022-12-13 | 北京科技大学 | 一种提升熔池动力学特性的转炉及方法 |
| CN115466814B (zh) * | 2022-08-30 | 2023-09-15 | 北京科技大学 | 一种提升熔池动力学特性的转炉及方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5816013A (ja) | 1983-01-29 |
| EP0070526B1 (de) | 1987-04-08 |
| DE3276008D1 (en) | 1987-05-14 |
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