IT1122652B - Electroslag remelting of steel and alloys for turbine rotors - using alkaline earth metal to deoxidise fluorspar contg. slag to obtain very low aluminium content - Google Patents
Electroslag remelting of steel and alloys for turbine rotors - using alkaline earth metal to deoxidise fluorspar contg. slag to obtain very low aluminium contentInfo
- Publication number
- IT1122652B IT1122652B IT2475679A IT2475679A IT1122652B IT 1122652 B IT1122652 B IT 1122652B IT 2475679 A IT2475679 A IT 2475679A IT 2475679 A IT2475679 A IT 2475679A IT 1122652 B IT1122652 B IT 1122652B
- Authority
- IT
- Italy
- Prior art keywords
- slag
- alkaline earth
- turbine rotors
- deoxidise
- fluorspar
- Prior art date
Links
- 239000002893 slag Substances 0.000 title abstract 6
- 229910000831 Steel Inorganic materials 0.000 title abstract 4
- 229910052784 alkaline earth metal Inorganic materials 0.000 title abstract 4
- 150000001342 alkaline earth metals Chemical class 0.000 title abstract 4
- 239000010959 steel Substances 0.000 title abstract 4
- 229910052782 aluminium Inorganic materials 0.000 title abstract 3
- 239000004411 aluminium Substances 0.000 title abstract 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title abstract 2
- 239000000956 alloy Substances 0.000 title 1
- 229910045601 alloy Inorganic materials 0.000 title 1
- 239000010436 fluorite Substances 0.000 title 1
- 229910052751 metal Inorganic materials 0.000 abstract 2
- 239000002184 metal Substances 0.000 abstract 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 abstract 1
- 229910001634 calcium fluoride Inorganic materials 0.000 abstract 1
- 230000001627 detrimental effect Effects 0.000 abstract 1
- 150000002222 fluorine compounds Chemical class 0.000 abstract 1
- 238000010309 melting process Methods 0.000 abstract 1
- 150000002739 metals Chemical class 0.000 abstract 1
Landscapes
- Nonmetallic Welding Materials (AREA)
Abstract
During the melting process the slag, which contains CaF2, is deoxidised by aluminium which is partly or completely replaced by one or more alkaline earth metals. The deoxid. of the slag is pref. undertaken by Ca; or by Mg and/or Ba which may be added as fluorides. Several alkaline earth metals may be used where one is Ca; and the metals are pref. placed in a metal sheath for addn. to the slag. The alkaline earth metals may also form a core in a tubular steel wire driven by a wire feeding machine into the slag. When Al is used for oxidising the slag, the resulting steel contains Ca. 0.02% Al, which is detrimental in some steels, e.g. it can reduce the creep resistance of turbine rotors used in power station plant. The invention reduces the Al content to 0.01% without impairing other properties.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT2475679A IT1122652B (en) | 1979-07-30 | 1979-07-30 | Electroslag remelting of steel and alloys for turbine rotors - using alkaline earth metal to deoxidise fluorspar contg. slag to obtain very low aluminium content |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT2475679A IT1122652B (en) | 1979-07-30 | 1979-07-30 | Electroslag remelting of steel and alloys for turbine rotors - using alkaline earth metal to deoxidise fluorspar contg. slag to obtain very low aluminium content |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IT7924756A0 IT7924756A0 (en) | 1979-07-30 |
| IT1122652B true IT1122652B (en) | 1986-04-23 |
Family
ID=11214641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT2475679A IT1122652B (en) | 1979-07-30 | 1979-07-30 | Electroslag remelting of steel and alloys for turbine rotors - using alkaline earth metal to deoxidise fluorspar contg. slag to obtain very low aluminium content |
Country Status (1)
| Country | Link |
|---|---|
| IT (1) | IT1122652B (en) |
-
1979
- 1979-07-30 IT IT2475679A patent/IT1122652B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| IT7924756A0 (en) | 1979-07-30 |
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