EP0663250A1 - Continuous casting method for steels - Google Patents
Continuous casting method for steels Download PDFInfo
- Publication number
- EP0663250A1 EP0663250A1 EP95300052A EP95300052A EP0663250A1 EP 0663250 A1 EP0663250 A1 EP 0663250A1 EP 95300052 A EP95300052 A EP 95300052A EP 95300052 A EP95300052 A EP 95300052A EP 0663250 A1 EP0663250 A1 EP 0663250A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cast piece
- continuous casting
- molten steel
- steels
- cast
- 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
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
Definitions
- This invention relates to a continuous casting method applicable for steels such as bearing steels and spring steels.
- the continuous casting process has remarkable advantages in the high yield rate and in the high productivity because a blooming process is not required, and is widely utilized as a casting method which is possible to continuously manufacture the final cast piece such as a slab, a bloom, a billet and so on directly from molten steel.
- the segregation and the concentration phenomena of the chemical elements such as carbon in the center part of the cast piece is considered to be caused by the solidification of the molten steel proceeding toward the center part from the outer peripheral part of the cast piece, in particular, it is considered that flowing of the concentrated molten steel is produced by solidification shrinkage at the time a liquid phase remaining in the center part of the cat piece is finally solidified, and linked up with the concentrated segregation of carbon and the like.
- the aforementioned soft reduction treatment is to prevent the flowing of the concentrated molten steel caused by the solidification shrinkage and to inhibit the segregation at the time of solidification by compressively deforming the unsolidified portion in the center of the cast piece at least an amount corresponding to the volume reduction at the time of solidification.
- the soft reduction treatment is sometimes accompanied with a risk of generation of cracks at a front surface of the solidification according to magnitude of tensile stress produced by the deformation of unsolidified interface of the molten steel.
- the cracks generated at the front surface of the solidification brings penetration into the cracks of the molten steel concentrated with carbon, sulfur, phosphorus and so on at the front surface of the solidification, and may be a defect harmful as much as center segregation in the finished products.
- This invention is made in order to solve this kind of problem of the prior art.
- the present invention provides a continuous casting method for steels comprising: pouring molten steel into a water cooled mould through an upper opening of the mould; solidifying the molten steel to form a cast piece in the mould and drawing continuously the cast piece through a lower opening of said mould at the same time, wherein said cast piece has a circular cross section, and is subjected to soft reduction treatment with a flat part of a roll at a position of a solid phase ratio from 0.2 to 0.8 before the molten steel in the center part of the cast piece is completely solidified.
- the molten steel undergoes a change in state from perfect liquid phase A to perfect solid phase C through solid-liquid mixed phase B as shown in FIG.5.
- the solid phrase ratio is defined as a weight ratio occupied by the solid phase on a cross section of the cat piece (the solid phase ratio 1 means the state of perfect solid phase).
- the continuous casting method according to this invention is characterized by subjecting to the soft reduction treatment against the cast piece cast into a shape having a circular cross section with the flat part of the roll R at the position of the solid phase ratio from 0.2 to 0.8 in the solid-liquid mixed phase as shown in FIG.5.
- the roll having the flat part means a roll possible to form a plane on the depressed surface of the cast piece with the circular cross section, and the roll is applicable without distinction of the shape so long as it is possible to form a plane on the contact surface of the cast piece.
- the inventors carried out stress-strain analysis at the time of applying the soft reduction with the flat part of the roll R against a cast piece D having a circular cross section (350mm diameter) and a cast piece E having a square cross section (350mm square) shown in FIGS.3A and 3B through the finite element method using computer, and results were obtained as shown in FIG.4. Additionally, symbol F denotes the unsolidified portion, and symbol G denotes the completely solidified portion of the cast pieces D and E in FIGS. 3A and 3B.
- the axis of abscissas shows a reduction ratio applied to the cast piece, and the axis of ordinates shows volume reduction of the unsolidified center portion with an index.
- the reduction ratio means the decrease percentage of area on the cross section of the cast piece before and after the soft reduction.
- This invention is made on basis of the above-mentioned findings, it is possible to prevent the cast piece from the segregation of carbon and the like at the same time of controlling the generation of the tensile stress in the cast piece in a low level and preventing the cast piece from the generation of cracks, therefore it is possible to improve the quality of the cast piece according to this invention.
- This invention is especially effective when it is applied to steels containing carbon not lower than 0.5 %.
- the continuous casting method according to this invention is especially characterized by performing the soft reduction at the position of the solid phase ratio from 0.2 to 0.8.
- the soft reduction is applied on the cast piece at the position of the solid phase ratio from 0.2 to 0.8 for the reason that a liquid phase in the center portion of the cast piece loses its fluidity substantially and it is not possible to obtain the sufficient effect by the low reduction treatment even if the low reduction is applied on the cast piece at the position of solid phase ratio more than 0.8, and in contrast with this, the liquid phase occupied most of the cross section of the cast piece at the position of solid phase ratio less than 0.2 and it is not possible similarly to obtain the sufficient effect by the low reduction treatment owing to the excessive fluidity of the liquid phase.
- the low reduction is performed for the purpose of preventing the cast piece from the cracks and the concentrated segregation of the chemical components such as carbon, phosphorus, sulfur and so on at the center portion of the cast piece.
- the cast piece was subjected to the low reduction treatment with a reduction ratio of 2 % at a position of a solid phase ratio(fs) from 0.4 to 0.5 using a double roll disposed with two flat rolls on the upper and lower sides. Additionally, the roll is available so long as it has a flat part even a roll having a V-shaped recess partially.
- Example 1 Steel including 0.6 % of carbon and specified as SUP 7 in JIS G 4801 (Spring Steels) was cast into a cast piece through the continuous casting process under the same condition as that of Example 1, and a graph on the upper side in FIG.2 was obtained as a result of analyzing the carbon content on the cross section of the obtained cast piece . Furthermore, there were not internal cracks at all. A graph on the lower side in FIG.2 shows a result of a cast piece obtained without applying the low reduction treatment.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
- This invention relates to a continuous casting method applicable for steels such as bearing steels and spring steels.
- The continuous casting process has remarkable advantages in the high yield rate and in the high productivity because a blooming process is not required, and is widely utilized as a casting method which is possible to continuously manufacture the final cast piece such as a slab, a bloom, a billet and so on directly from molten steel.
- However, in a case of casting the molten steel through the continuous casting process, carbon, phosphorus, sulfur and the like have a tendency to segregate (concentrate) in the center part of the cast piece, accordingly there has been a problem in that it is difficult to introduce the continuous casting process for steels containing chemical elements easy to segregate, especially for the steels containing a large amount of carbon, such as bearing steels, spring steels and so on.
- As a method for inhibiting the segregation, the method to apply soft reduction against the cast piece drawn out from the mould is well known.
- The segregation and the concentration phenomena of the chemical elements such as carbon in the center part of the cast piece is considered to be caused by the solidification of the molten steel proceeding toward the center part from the outer peripheral part of the cast piece, in particular, it is considered that flowing of the concentrated molten steel is produced by solidification shrinkage at the time a liquid phase remaining in the center part of the cat piece is finally solidified, and linked up with the concentrated segregation of carbon and the like.
- The aforementioned soft reduction treatment is to prevent the flowing of the concentrated molten steel caused by the solidification shrinkage and to inhibit the segregation at the time of solidification by compressively deforming the unsolidified portion in the center of the cast piece at least an amount corresponding to the volume reduction at the time of solidification.
- However, in the soft reduction treatment, the cast piece is applied with the compressive deformation in the state where the unsolidified portion remains in the center part of the cast piece, therefore the soft reduction treatment is sometimes accompanied with a risk of generation of cracks at a front surface of the solidification according to magnitude of tensile stress produced by the deformation of unsolidified interface of the molten steel.
- The cracks generated at the front surface of the solidification brings penetration into the cracks of the molten steel concentrated with carbon, sulfur, phosphorus and so on at the front surface of the solidification, and may be a defect harmful as much as center segregation in the finished products.
- Accordingly, it is necessary to apply the soft reduction to the cast piece effectively so that high tensile stress may not be generated at the unsolidified interface of the molten steel and the unsolidified center portion of the cast piece may change in the volume (compressive deformation) sufficiently in order to prevent the aforementioned cracks at the soft reduction treatment. Therefore, it has been hoped to establish the technical method possible to realize the effective soft reduction treatment without generating the cracks.
- This invention is made in order to solve this kind of problem of the prior art.
- The present invention provides a continuous casting method for steels comprising: pouring molten steel into a water cooled mould through an upper opening of the mould; solidifying the molten steel to form a cast piece in the mould and drawing continuously the cast piece through a lower opening of said mould at the same time, wherein said cast piece has a circular cross section, and is subjected to soft reduction treatment with a flat part of a roll at a position of a solid phase ratio from 0.2 to 0.8 before the molten steel in the center part of the cast piece is completely solidified.
- Preferred embodiments of the present invention will now be described hereinbelow by way of example only with reference to the accompanying drawings, in which:
- FIG.1 is a graph illustrating distribution of the carbon concentration on a cross section of a cast piece obtained in an embodiment according to this invention in comparison with that of a cast piece obtained without soft reduction;
- FIG.2 is a graph illustrating distribution of the carbon concentration on a cross section of a cast piece obtained in another embodiment according to this invention in comparison with that of a cast piece obtained without soft reduction;
- FIGS.3A and 3B are perspective views illustrating testing methods for confirming an effect of soft reduction in the continuous casting method according to this invention;
- FIG.4 is a graph illustrating results obtained through the testing method shown in FIGS.3A and 3B; and
- FIG.5 is a schematic view illustrating a position to be applied with the soft reduction in the continuous casting method according to this invention.
- In the continuous casting, the molten steel undergoes a change in state from perfect liquid phase A to perfect solid phase C through solid-liquid mixed phase B as shown in FIG.5.
- In the continuous casting process according to this invention, the solid phrase ratio is defined as a weight ratio occupied by the solid phase on a cross section of the cat piece (the
solid phase ratio 1 means the state of perfect solid phase). - It is possible to estimate the solid phase ratio from the thermal distribution on the cross section of the cast piece obtained according to the heat transfer calculation based on data such as specific heat and thermal conductivity of the cast piece, the temperature of the molten steel, for example.
- Then the continuous casting method according to this invention is characterized by subjecting to the soft reduction treatment against the cast piece cast into a shape having a circular cross section with the flat part of the roll R at the position of the solid phase ratio from 0.2 to 0.8 in the solid-liquid mixed phase as shown in FIG.5.
- The roll having the flat part means a roll possible to form a plane on the depressed surface of the cast piece with the circular cross section, and the roll is applicable without distinction of the shape so long as it is possible to form a plane on the contact surface of the cast piece.
- As mentioned above, in the soft reduction treatment, it is necessary to apply the soft reduction to the cast piece effectively so as to sufficiently vary the volume of the unsolidified center portion (compressive deformation) without producing the high tensiled stress on the unsolidified interface of the molten steel for preventing the cast piece from the internal cracks.
- In order to find appropriate conditions for the soft reduction treatment, the inventors carried out stress-strain analysis at the time of applying the soft reduction with the flat part of the roll R against a cast piece D having a circular cross section (350mm diameter) and a cast piece E having a square cross section (350mm square) shown in FIGS.3A and 3B through the finite element method using computer, and results were obtained as shown in FIG.4. Additionally, symbol F denotes the unsolidified portion, and symbol G denotes the completely solidified portion of the cast pieces D and E in FIGS. 3A and 3B.
- In graph A of FIG.4, the axis of abscissas shows a reduction ratio applied to the cast piece, and the axis of ordinates shows volume reduction of the unsolidified center portion with an index. The reduction ratio means the decrease percentage of area on the cross section of the cast piece before and after the soft reduction.
- The other side, in graph B and graph C of FIG.4, the tensile stress generated on the unsolidified interface of the molten steel in the directions of X-axis (perpendicular to the axis of the cast piece) and Y-axis (axial direction of the cast piece) are plotted as ordinates against the reduction ratio as abscissas.
- The results show that the reduction ratio required for obtaining the some volume reduction at the unsolidified center portion of the cast piece is remarkably different between the cases of the cast piece D having the circular section and the cast piece E having the square cross section, and the reduction ratio to be applied on the cast piece D having the circular cross section is not required so much in comparison with that to be applied on the cast piece E having the square cross section.
- Furthermore, when the volume reduction is equivalent at the unsolidified center portion between the cast pieces D and E, it is found that the tensile stress generated at the unsolidified interface of the molten steel in the cast piece D having the circular cross section is remarkably low as compared with that in the cast piece E having the square cross section from the results shown in graphs B and C of FIG.4.
- In view of the aforementioned results, it is seen that it is possible to reduce the volume of the unsolidified center portion effectively at the same time of controlling the tensile stress generated at the unsolidified interface of the cast piece very low by the compression with low reduction ratio when the cast piece is cast into the shape having the circular cross section and subjected to the low reduction with the flat part of the roll.
- This invention is made on basis of the above-mentioned findings, it is possible to prevent the cast piece from the segregation of carbon and the like at the same time of controlling the generation of the tensile stress in the cast piece in a low level and preventing the cast piece from the generation of cracks, therefore it is possible to improve the quality of the cast piece according to this invention.
- This invention is especially effective when it is applied to steels containing carbon not lower than 0.5 %.
- There is no doubt that it is possible to apply this invention to steels containing carbon lower than 0.5 %. Even in this case, the similar effect can be obtained in that it is possible prevent the cast piece from the segregation by deforming the center portion of the cast piece effectively at the same time of controlling the tensile stress in the cast piece very low.
- The continuous casting method according to this invention is especially characterized by performing the soft reduction at the position of the solid phase ratio from 0.2 to 0.8.
- In this invention, the soft reduction is applied on the cast piece at the position of the solid phase ratio from 0.2 to 0.8 for the reason that a liquid phase in the center portion of the cast piece loses its fluidity substantially and it is not possible to obtain the sufficient effect by the low reduction treatment even if the low reduction is applied on the cast piece at the position of solid phase ratio more than 0.8, and in contrast with this, the liquid phase occupied most of the cross section of the cast piece at the position of solid phase ratio less than 0.2 and it is not possible similarly to obtain the sufficient effect by the low reduction treatment owing to the excessive fluidity of the liquid phase.
- In this invention, the low reduction is performed for the purpose of preventing the cast piece from the cracks and the concentrated segregation of the chemical components such as carbon, phosphorus, sulfur and so on at the center portion of the cast piece. In this sense, it is preferable to apply the low reduction to the cast piece in a reduction ratio range of 1.0 to 3.0 %, and further preferable in the reduction ratio range of 1.5 to 2.5 %.
- This invention will be described below in detail on basis of the following non-limiting examples.
- Steel including 1.0 % of carbon and specified as SUJ 2 in JIS G 4805 (High Carbon Chromium Bearing Steels) was cast into a cast piece having a circular cross section with a diameter of 350 mm at an extraction speed(Vc) of 0.4 m/min through the continuous casting process.
- In this time, the cast piece was subjected to the low reduction treatment with a reduction ratio of 2 % at a position of a solid phase ratio(fs) from 0.4 to 0.5 using a double roll disposed with two flat rolls on the upper and lower sides. Additionally, the roll is available so long as it has a flat part even a roll having a V-shaped recess partially.
- As a result of analyzing the carbon content on the cross section of the obtained cast piece, a graph on the upper side in FIG.1 was obtained. Furthermore, it is confirmed that there were not internal cracks in the cast piece.
- The other side, a result shown in a graph on the lower side in FIG.1 was obtained by analyzing the carbon content of a cast piece cast in the same manner without applying the low reduction treatment in order to make comparison.
- According to the comparison between both graphs of FIG.1, it is apparent that it is possible to inhibit the center segregation without generating the internal cracks by casting the molten steel into the cast piece having the circular cross section and applying the low reduction to the cast piece with the flat roll.
- Steel including 0.6 % of carbon and specified as SUP 7 in JIS G 4801 (Spring Steels) was cast into a cast piece through the continuous casting process under the same condition as that of Example 1, and a graph on the upper side in FIG.2 was obtained as a result of analyzing the carbon content on the cross section of the obtained cast piece . Furthermore, there were not internal cracks at all. A graph on the lower side in FIG.2 shows a result of a cast piece obtained without applying the low reduction treatment.
- By comparing results shown in both graphs of FIG.2, it is seen that it is possible to inhibit the segregation of carbon in the center portion effectively also in the case of the steel specified as SUP 7 by casting the cast piece having the circular cross section and applying the low reduction to the cast piece using the flat roll.
- Although the embodiments in accordance with this invention have been described in detail, they are merely given by way of example only, and it will be understood that this invention can be used in the continuous casting of the various types of steels. Furthermore, it is possible to perform the present invention as embodiments applied with various modification without departing from the scope of this invention.
Claims (3)
- A continuous casting method for steels comprising:
pouring molten steel into a water cooled mould through an upper opening of the mould;
solidifying the molten steel to form a cast piece in the mould and drawing continuously the cast piece through a lower opening of said mould at the same time, wherein said cast piece has a circular cross section, and is subjected to soft reduction treatment with a flat part of a roll at a position of a solid phase ratio from 0.2 to 0.8 before the molten steel in the center part of the cast piece is completely solidified. - A continuous casting method for steels as set forth in claim 1, wherein said cast piece is subjected to the soft reduction treatment of a reduction ratio from 1.0 to 3.0 %.
- A continuous casting method for steels as set forth in claim 1, wherein said cast piece is subjected to the soft reduction treatment of a reduction ratio from 1.5 to 2.5 %.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15772/94 | 1994-01-14 | ||
JP01577294A JP3257224B2 (en) | 1994-01-14 | 1994-01-14 | Continuous casting method |
JP1577294 | 1994-01-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0663250A1 true EP0663250A1 (en) | 1995-07-19 |
EP0663250B1 EP0663250B1 (en) | 2001-05-23 |
Family
ID=11898106
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19950300052 Expired - Lifetime EP0663250B1 (en) | 1994-01-14 | 1995-01-05 | Continuous casting method for steels |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0663250B1 (en) |
JP (1) | JP3257224B2 (en) |
DE (1) | DE69520966T2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101648212B (en) * | 2009-09-15 | 2011-08-31 | 邢台钢铁有限责任公司 | Bloom continuous casting dynamic soft reduction process for prestressed steel SWRH82B |
CN107000045A (en) * | 2014-12-24 | 2017-08-01 | 杰富意钢铁株式会社 | The continuous casing of steel |
CN107206475A (en) * | 2015-01-30 | 2017-09-26 | 杰富意钢铁株式会社 | The continuous casing of steel |
CN108817338A (en) * | 2018-07-06 | 2018-11-16 | 青岛特殊钢铁有限公司 | A kind of continuous casting and rolling process for production suitable for high-strength spring flat steel |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3367332B2 (en) * | 1996-05-15 | 2003-01-14 | 日本鋼管株式会社 | Manufacturing method of difficult-to-work seamless steel pipe |
KR20000008005A (en) * | 1998-07-09 | 2000-02-07 | 이구택 | Continuous casting method in which central defect of slab decreases |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4134440A (en) * | 1974-09-16 | 1979-01-16 | Nippon Kokan Kabushiki Kaisha | Method of continuously casting steel |
GB2014071A (en) * | 1978-02-13 | 1979-08-22 | Nippon Kokan Kk | Continuous casting of steel |
JPS60184455A (en) * | 1984-03-01 | 1985-09-19 | Nippon Steel Corp | Production of continuous casting billet with application of rolling down |
EP0211422A1 (en) * | 1985-08-03 | 1987-02-25 | Nippon Steel Corporation | Continuous casting method |
JPS635859A (en) * | 1986-06-25 | 1988-01-11 | Nippon Steel Corp | Continuous casting method for high silicon steel |
JPH01273658A (en) * | 1988-04-27 | 1989-11-01 | Sumitomo Metal Ind Ltd | Method for continuously casting steel giving rolling reduction |
EP0417492A2 (en) * | 1989-08-16 | 1991-03-20 | Daido Tokushuko Kabushiki Kaisha | Vertical continuous casting method and casting apparatus |
-
1994
- 1994-01-14 JP JP01577294A patent/JP3257224B2/en not_active Expired - Lifetime
-
1995
- 1995-01-05 DE DE1995620966 patent/DE69520966T2/en not_active Expired - Fee Related
- 1995-01-05 EP EP19950300052 patent/EP0663250B1/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4134440A (en) * | 1974-09-16 | 1979-01-16 | Nippon Kokan Kabushiki Kaisha | Method of continuously casting steel |
GB2014071A (en) * | 1978-02-13 | 1979-08-22 | Nippon Kokan Kk | Continuous casting of steel |
JPS60184455A (en) * | 1984-03-01 | 1985-09-19 | Nippon Steel Corp | Production of continuous casting billet with application of rolling down |
EP0211422A1 (en) * | 1985-08-03 | 1987-02-25 | Nippon Steel Corporation | Continuous casting method |
JPS635859A (en) * | 1986-06-25 | 1988-01-11 | Nippon Steel Corp | Continuous casting method for high silicon steel |
JPH01273658A (en) * | 1988-04-27 | 1989-11-01 | Sumitomo Metal Ind Ltd | Method for continuously casting steel giving rolling reduction |
EP0417492A2 (en) * | 1989-08-16 | 1991-03-20 | Daido Tokushuko Kabushiki Kaisha | Vertical continuous casting method and casting apparatus |
Non-Patent Citations (3)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 010, no. 025 (M - 450) 31 January 1986 (1986-01-31) * |
PATENT ABSTRACTS OF JAPAN vol. 012, no. 201 (M - 707) 10 June 1988 (1988-06-10) * |
PATENT ABSTRACTS OF JAPAN vol. 014, no. 042 (M - 0925) 25 January 1990 (1990-01-25) * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101648212B (en) * | 2009-09-15 | 2011-08-31 | 邢台钢铁有限责任公司 | Bloom continuous casting dynamic soft reduction process for prestressed steel SWRH82B |
CN107000045A (en) * | 2014-12-24 | 2017-08-01 | 杰富意钢铁株式会社 | The continuous casing of steel |
CN107000045B (en) * | 2014-12-24 | 2019-04-26 | 杰富意钢铁株式会社 | The continuous casing of steel |
US10543527B2 (en) | 2014-12-24 | 2020-01-28 | Jfe Steel Corporation | Continuous steel casting method |
CN107206475A (en) * | 2015-01-30 | 2017-09-26 | 杰富意钢铁株式会社 | The continuous casing of steel |
CN108817338A (en) * | 2018-07-06 | 2018-11-16 | 青岛特殊钢铁有限公司 | A kind of continuous casting and rolling process for production suitable for high-strength spring flat steel |
CN108817338B (en) * | 2018-07-06 | 2020-01-24 | 青岛特殊钢铁有限公司 | Continuous casting and rolling production process suitable for high-strength spring flat steel |
Also Published As
Publication number | Publication date |
---|---|
DE69520966D1 (en) | 2001-06-28 |
JPH07204812A (en) | 1995-08-08 |
DE69520966T2 (en) | 2001-11-15 |
JP3257224B2 (en) | 2002-02-18 |
EP0663250B1 (en) | 2001-05-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
El-Bealy | Macrosegregation quality criteria and mechanical soft reduction for central quality problems in continuous casting of steel | |
EP0663250B1 (en) | Continuous casting method for steels | |
EP1066897B1 (en) | Continuous casting method | |
KR960004422B1 (en) | Method and apparatus for continuous compression forging of continuous casting steel | |
JP3104635B2 (en) | Manufacturing method of round billet slab by continuous casting | |
EP0263725B1 (en) | Method and apparatus for continuous compression forging of continuously cast steel | |
JP2995520B2 (en) | How to improve the quality of continuous cast slabs | |
JP3271574B2 (en) | Continuous casting method of billet slab | |
JP3261556B2 (en) | Continuous casting method | |
JPH08164460A (en) | Production of continuously cast slab having good internal quality | |
JP3092543B2 (en) | Manufacturing method of round billet slab by continuous casting | |
JPH03124352A (en) | Production of continuously cast slab having excellent internal quality | |
JP3319379B2 (en) | Continuous casting method of steel billet | |
JP3257218B2 (en) | Manufacturing method for spring steel | |
Stolyarov et al. | Non-metallic impurities in continuous cast billets | |
JP3149818B2 (en) | Manufacturing method of round billet slab by continuous casting | |
JPH0710425B2 (en) | Continuous casting method for steel | |
JPH10128512A (en) | Unsolidified reduction rolling method for round billet | |
JPH11156512A (en) | Unsolidified press down manufacturing method of blank beam | |
JP2915544B2 (en) | Continuous forging method of slab strand in continuous casting. | |
JPH05185186A (en) | Method for continuously casting steel | |
JPH11123513A (en) | Method for continuously casting steel | |
JP3297802B2 (en) | Continuous casting method | |
JPH0999349A (en) | Method for continuously casting round cast billet for bar steel | |
JPH0573506B2 (en) |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB IT |
|
17P | Request for examination filed |
Effective date: 19960112 |
|
17Q | First examination report despatched |
Effective date: 19980302 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
ITF | It: translation for a ep patent filed |
Owner name: JACOBACCI & PERANI S.P.A. |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB IT |
|
REF | Corresponds to: |
Ref document number: 69520966 Country of ref document: DE Date of ref document: 20010628 |
|
ET | Fr: translation filed | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20050105 |
|
PGRI | Patent reinstated in contracting state [announced from national office to epo] |
Ref country code: IT Effective date: 20080301 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20090102 Year of fee payment: 15 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20081231 Year of fee payment: 15 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20090128 Year of fee payment: 15 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20090113 Year of fee payment: 15 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20100105 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20100930 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100201 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100803 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100105 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100105 |