EP0321478A1 - Giesspulver bei der blockstahlerzeugung im unterguss und verfahren zu seiner verwendung. - Google Patents
Giesspulver bei der blockstahlerzeugung im unterguss und verfahren zu seiner verwendung.Info
- Publication number
- EP0321478A1 EP0321478A1 EP87905525A EP87905525A EP0321478A1 EP 0321478 A1 EP0321478 A1 EP 0321478A1 EP 87905525 A EP87905525 A EP 87905525A EP 87905525 A EP87905525 A EP 87905525A EP 0321478 A1 EP0321478 A1 EP 0321478A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mold
- casting powder
- steel
- expandable graphite
- molten steel
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
- B22D27/06—Heating the top discard of ingots
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/12—Appurtenances, e.g. for sintering, for preventing splashing
Definitions
- This invention relates to mold powders employed in ingot steel production. More specifically, the present invention discloses a casting powder to be employed in bottom pour steel molds which has the unique ability to act as both a bottom pour flux and a hot topping compound.
- a sealed bag of bottom pour flux is suspended in the mold approximately six to eighteen inches above the inlet for the molten steel.
- the bottom pour flux consists of chemical compounds which melt and spread rapidly across the surface of the molten steel.
- the molten slag coating the surface of the steel acts to create the correct menisus shape and prevents oxidation of steel surface.
- the molten slag insulates the surface of the molten steel to slow solidification, and spreads a thin coat of homogenous glass between the mold and the molten steel to allow constant heat transfer and solidification and thus lessen thermally induced stresses and resultant cracking.
- the flux absorbs impurities such as deoxidation and reoxidation products and refractory particles.
- the bag containing the bottom pour flax burns upon the introduction of the molten steel into the mold thus automatically releasing the flux.
- hot topping compounds are not without its detractions. Adding hot topping compound is cumbersome, labor intensive, environmentally disruptive, and may contaminate the ingot steel.
- the present invention is directed to casting powders for use in ingot steel production through bottom pour process. Instead of the bottom pour flux and the hot topping compound presently employed, the present invention substitutes a single casting powder which provides the benefits of both the prior products.
- the present invention entails introducing a compound know as "expandable graphite" in place of a portion of the carbon component of a standard bottom pour flux.
- the resulting mixtur provides all the insulative and protective benefits of standard bottom pour fluxes as well as the full insulative requirements of hot topping compounds.
- the present invention is cleanly and automatically dispersed upon introduction of molten steel into the steel ingo molds. It eliminates the noxious by-products of hot topping compound and its potentially contaminating effect of "core of debris,” and does not require the labor input demanded for application of hot topping compound.
- the present invention provides a mixture of chemical components which function as a unique casting powder for bottom pour ingot steel production.
- the present invention combines the crucial properties of both bottom pour fluxes and hot topping compounds into a single, easily dispensed, composition.
- Bottom pour fluxes (or powders) presently employed are required to have specific qualities for covering and protecting molten steel rising in an ingot mold. These include: molten slag layer to completely coat the molten steel, to insulate, maintain a proper surface shape, protect against oxidation, and absorb deoxidation and reoxidation products; and an ability to form a thin layer of homogenous glass between the molten steel and the side walls of the mold so as to insulate, reduce thermally induced stresses and thus decrease cracking.
- composition of a traditional bottom pour flux may comprise the following:
- Hot topping compounds have only one primary purpose: to provide a thick insulative blanket on top of the molten steel to reduce the heat loss from the top to avoid "pipe.”
- Pipe is a condition which occurs when there is no molten steel to feed the shrinkage cavity formed due to ingot solidification. Due to the expansion of the steel while molten, this discrepancy leaves the sides too high in respect to the core. Thus, without proper insulation, the center of the steel ingot will solidify in a sunken position or with severe imperfections — creating an entire segment of the ingot which must be excised and discarded. To accomplish the necessary insulation, a wide variety of compositions have been utilized. Typical ranges are as follows: Constituent Percentage ( % ) Range by wen-m
- Expandable graphite is produced through treatment of high grade natural crystalline graphite through oxidation or electrolysis by various oxidizing materials. It is commercially available in a number of grades from graphite suppliers.
- expandable graphite When expandable graphite is heated rapidly it expands along the C-axis of the crystal to a magnitude of 40 to 300 times its original size.
- Iron Oxide (Fe2 ⁇ 3. 4.0 - 6.0
- the present invention is prepared in the same manner as standard bottom pour flux.
- Expandable graphite has different expansion rates according to its quality. It is desired to use expandable graphite that expands between 100 and 300 times its volume within the percentage weight range provided above. It is believed that ideally an expansion of 200 to 250 times its volume at a percentage weight of 6.0 to 8.0% should be employed.
- the casting powder has a viscosity nearly identical to that of standard bottom pour flux (i.e. at 1500°C, bottom pour flux has a viscosity of approximately 50-200 poise, the present invention produces a flux with a viscosity of 50-200 poise). Moreover, under pressure the present invention produces a unique quality compressio product having anistrophy. This results in a substance perfectly suitable to properly coat between the molten steel and the side walls of the ingot mold during pouring. Thus, the casting powder produced provides superior results as both a bottom pour flux and a hot topping compound.
- the casting powder is dispersed in the same manner as standard bottom pour flux. It is placed in a combustible container or bag, such as paper bag with grommet reinforcements, and suspended six to eighteen inches above the bottom of the ingot mold. It can also be preformed into a board and placed at the bottom of the mold. The incoming molten steel consumes the container or dissolves the board causing the release of the powder. The powder then rapidly spreads across the surface of the incoming molten steel. This is a clean, automatic process which requires little human input and supervision.
- the benefits of the present invention are realized through the elimination of hot topping compound. Personnel are no longer required to be stationed above the molds to apply the insulative material. Atmospheric dust from the hot topping compound and "core of debris" are also eliminated. Additionally, no smoke products are produced whatsoever. Despite the somewhat higher cost of substituting expandable graphite for standard graphite, the elimination of hot topping compound and the considerable cost savings in application provide a considerable overall cost savings.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Mold Materials And Core Materials (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87905525T ATE96708T1 (de) | 1986-08-13 | 1987-08-10 | Giesspulver bei der blockstahlerzeugung im unterguss und verfahren zu seiner verwendung. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US89606786A | 1986-08-13 | 1986-08-13 | |
US896067 | 1986-08-13 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0321478A1 true EP0321478A1 (de) | 1989-06-28 |
EP0321478A4 EP0321478A4 (de) | 1990-04-10 |
EP0321478B1 EP0321478B1 (de) | 1993-11-03 |
Family
ID=25405572
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87905525A Expired - Lifetime EP0321478B1 (de) | 1986-08-13 | 1987-08-10 | Giesspulver bei der blockstahlerzeugung im unterguss und verfahren zu seiner verwendung |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0321478B1 (de) |
JP (1) | JPH01501536A (de) |
KR (1) | KR880701599A (de) |
AU (1) | AU604503B2 (de) |
BR (1) | BR8707766A (de) |
CA (1) | CA1285461C (de) |
DE (1) | DE3788067T2 (de) |
MX (1) | MX169019B (de) |
WO (1) | WO1988001210A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE59810610D1 (de) * | 1997-04-30 | 2004-02-26 | Stopinc Ag Huenenberg | Schiebeverschluss für ein Metallschmelze enthaltendes Gefäss |
JP5366896B2 (ja) * | 2010-07-07 | 2013-12-11 | 株式会社神戸製鋼所 | 下注ぎ造塊方法 |
JP5807910B2 (ja) * | 2011-11-15 | 2015-11-10 | 山陽特殊製鋼株式会社 | 下注ぎ造塊用の被覆剤 |
JP6609139B2 (ja) * | 2015-08-24 | 2019-11-20 | 山陽特殊製鋼株式会社 | 下注ぎ造塊法のための被覆剤 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3811898A (en) * | 1969-11-12 | 1974-05-21 | Fiseco Int Ltd | Heat-insulating antipiping compositions |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3308514A (en) * | 1965-01-07 | 1967-03-14 | Dow Chemical Co | Method of hot topping using vermicular graphite |
GB1431787A (en) * | 1973-03-28 | 1976-04-14 | Foseco Int | Casting of molten metals |
JPS5253727A (en) * | 1975-10-28 | 1977-04-30 | Fuoseko Japan Rimitetsudo Yuug | Formed additive for mold |
JPS6038201B2 (ja) * | 1978-09-04 | 1985-08-30 | 石川島播磨重工業株式会社 | 圧延材端部形状制御装置 |
-
1987
- 1987-08-10 BR BR8707766A patent/BR8707766A/pt not_active Application Discontinuation
- 1987-08-10 EP EP87905525A patent/EP0321478B1/de not_active Expired - Lifetime
- 1987-08-10 JP JP62505033A patent/JPH01501536A/ja active Pending
- 1987-08-10 AU AU78567/87A patent/AU604503B2/en not_active Ceased
- 1987-08-10 DE DE3788067T patent/DE3788067T2/de not_active Expired - Fee Related
- 1987-08-10 WO PCT/US1987/001958 patent/WO1988001210A1/en active IP Right Grant
- 1987-08-12 CA CA000544344A patent/CA1285461C/en not_active Expired - Fee Related
- 1987-08-18 MX MX007790A patent/MX169019B/es unknown
-
1988
- 1988-04-13 KR KR1019880700405A patent/KR880701599A/ko not_active Application Discontinuation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3811898A (en) * | 1969-11-12 | 1974-05-21 | Fiseco Int Ltd | Heat-insulating antipiping compositions |
Non-Patent Citations (1)
Title |
---|
See also references of WO8801210A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE3788067D1 (de) | 1993-12-09 |
JPH01501536A (ja) | 1989-06-01 |
BR8707766A (pt) | 1989-08-15 |
AU7856787A (en) | 1988-03-08 |
CA1285461C (en) | 1991-07-02 |
KR880701599A (ko) | 1988-11-04 |
DE3788067T2 (de) | 1994-05-19 |
EP0321478A4 (de) | 1990-04-10 |
MX169019B (es) | 1993-06-17 |
AU604503B2 (en) | 1990-12-20 |
WO1988001210A1 (en) | 1988-02-25 |
EP0321478B1 (de) | 1993-11-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4422913B2 (ja) | 鋼の連続鋳造用モールドパウダー及び鋼の連続鋳造方法 | |
KR101316254B1 (ko) | 알루미늄이 다량 첨가된 무방향성 전기강판 주조용 몰드 플럭스 및 이를 이용한 무방향성 전기강판의 제조방법 | |
US5179997A (en) | Process for insulating molten steel during continuous casting | |
US4785872A (en) | Casting powder for use in bottom pour ingot steel production and method for employing same | |
EP0321478B1 (de) | Giesspulver bei der blockstahlerzeugung im unterguss und verfahren zu seiner verwendung | |
US4234630A (en) | Process for the protection of carbon bodies | |
US3324933A (en) | Centrifugal casting | |
JP3317258B2 (ja) | 高Mn丸断面鋳片の連続鋳造用モールドパウダ | |
US2791816A (en) | Method of applying exothermic material to the hot-top of steel | |
US3949803A (en) | Method of casting molten metal using mold additives | |
GB2265564A (en) | Tundish cover layer containing flux ingredients and expandable graphite | |
US20080178767A1 (en) | Dry-Spray Products For Protecting Centrifugal Casting Molds of Cast Iron Pipes in Association With a Wet-Spray Product | |
US3110943A (en) | Production of metal ingots, castings and the like | |
JPH09308951A (ja) | 鋼の連続鋳造用モールドパウダー | |
RU2214888C2 (ru) | Шлакообразующая смесь | |
US4006029A (en) | Hydration resistant fused dolomitic grain and production method therefor | |
JPS6344464B2 (de) | ||
JP7339568B2 (ja) | モールドパウダー | |
RU2169633C1 (ru) | Шлакообразующая смесь для непрерывной разливки стали | |
SU590079A1 (ru) | Шлакообразующа смесь | |
SU730457A1 (ru) | Шлакообразующа смесь | |
SU1227318A1 (ru) | Смесь дл утеплени головной части слитка | |
SU1696129A1 (ru) | Способ изготовлени литых заготовок | |
RU2214887C2 (ru) | Шлакообразующая смесь | |
RU2214886C2 (ru) | Шлакообразующая смесь |
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 |
|
17P | Request for examination filed |
Effective date: 19890310 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
A4 | Supplementary search report drawn up and despatched |
Effective date: 19900410 |
|
17Q | First examination report despatched |
Effective date: 19920319 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Effective date: 19931103 Ref country code: CH Effective date: 19931103 |
|
REF | Corresponds to: |
Ref document number: 96708 Country of ref document: AT Date of ref document: 19931115 Kind code of ref document: T |
|
REF | Corresponds to: |
Ref document number: 3788067 Country of ref document: DE Date of ref document: 19931209 |
|
ITF | It: translation for a ep patent filed |
Owner name: STUDIO INGG. FISCHETTI & WEBER |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
ET | Fr: translation filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: LU Payment date: 19940801 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19940804 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19940811 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 19940823 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19940824 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19940831 Year of fee payment: 8 Ref country code: DE Payment date: 19940831 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 19940902 Year of fee payment: 8 |
|
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 | ||
EAL | Se: european patent in force in sweden |
Ref document number: 87905525.9 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19950810 Ref country code: GB Effective date: 19950810 Ref country code: AT Effective date: 19950810 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19950811 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Effective date: 19950831 |
|
BERE | Be: lapsed |
Owner name: ATLANTIC METALS CORP. Effective date: 19950831 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19960301 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19950810 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19960430 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 19960301 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19960501 |
|
EUG | Se: european patent has lapsed |
Ref document number: 87905525.9 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
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: 20050810 |