US2543853A - Process for adding magnesium to cast iron - Google Patents
Process for adding magnesium to cast iron Download PDFInfo
- Publication number
- US2543853A US2543853A US172009A US17200950A US2543853A US 2543853 A US2543853 A US 2543853A US 172009 A US172009 A US 172009A US 17200950 A US17200950 A US 17200950A US 2543853 A US2543853 A US 2543853A
- Authority
- US
- United States
- Prior art keywords
- magnesium
- cast iron
- molten
- iron
- carbide
- 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
- 229910001018 Cast iron Inorganic materials 0.000 title claims description 22
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims description 22
- 239000011777 magnesium Substances 0.000 title claims description 22
- 229910052749 magnesium Inorganic materials 0.000 title claims description 22
- 238000000034 method Methods 0.000 title claims description 5
- UPKIHOQVIBBESY-UHFFFAOYSA-N magnesium;carbanide Chemical compound [CH3-].[CH3-].[Mg+2] UPKIHOQVIBBESY-UHFFFAOYSA-N 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 229910001141 Ductile iron Inorganic materials 0.000 description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- 239000010703 silicon Substances 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 4
- ATTFYOXEMHAYAX-UHFFFAOYSA-N magnesium nickel Chemical compound [Mg].[Ni] ATTFYOXEMHAYAX-UHFFFAOYSA-N 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- MKPXGEVFQSIKGE-UHFFFAOYSA-N [Mg].[Si] Chemical compound [Mg].[Si] MKPXGEVFQSIKGE-UHFFFAOYSA-N 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
Definitions
- My invention relates to metallurgy wherein magnesium is alloyed with cast iron to produce nodular graphite cast iron.
- nodular iron involves, first, the addition of sufificient magnesium to a molten cast iron to desulphurize said iron to yield a molten iron containing from 0.05 to 0.15% magnesium.
- the magnesium-bearing iron is then inoculated with about 0.75% silicon.
- magnesium carbide for introducing magnesium into molten cast iron quietly, I discovered that nodular iron produced with the addition agent, magnesium carbide, was superior to nodular iron produced with other magnesium addition agents-the magnesium-nickel alloys and the magnesium-silicon alloys, for example. Furthermore, I found that the use of magnesium carbide as an addition agent yielded unexpected good results when it was combined with the conventional amount of silicon inoculating agent.
- I divided a batch of molten iron into two portions, said molten iron being composed of 3.42% carbon, 1.99% silicon, 0.23% manganese, 0.045% phosphorus, and 0.015% sulphur.
- I added enough magnesium-nickel to bring the residual magnesium content of the metal up to 0.11% magnesium, and then I added 0.75% silicon.
- I added enough magnesium carbide to bring the residual magnesium content of the metal up to 0.12% magnesium, and then I added 0.75% silicon.
- nodular iron solidifies to form a product wherein a portion of the carbon content of the metal has formed graphite nodules surrounded by ferrite in a matrix of pearlite.
- the magnesium carbide treated metal the ferrite islands were much larger, indicatin that the use of magnesium carbide yielded a molten metal which more readily transformed into graphite nodules and ferrite than molten iron treated with conventional magnesium addition agents; furthermore, I found that this advantage of magnesium carbide over magnesium-nickel also applied to such addition agents as magnesiumcopper and magnesium-silicon.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Description
Patented Mar. 6, 1951 PROCESS FOR ADDING MAGNESIUM TO I CAST IRON James Fernando Jordan, Huntington Park, Calif.,
assignor to James Jordan Laboratory, Huntington Park, Calif., a partnership No Drawing. Application July 3, 1950, Serial No. 172,009
2 Claims.
My invention relates to metallurgy wherein magnesium is alloyed with cast iron to produce nodular graphite cast iron.
This is a continuation-in-part of my copending application, Serial No. 123,087, filed on October 22, 1949, now abandoned.
The production of nodular iron involves, first, the addition of sufificient magnesium to a molten cast iron to desulphurize said iron to yield a molten iron containing from 0.05 to 0.15% magnesium. The magnesium-bearing iron is then inoculated with about 0.75% silicon.
During the course of experiments concerning the use of magnesium carbide for introducing magnesium into molten cast iron quietly, I discovered that nodular iron produced with the addition agent, magnesium carbide, was superior to nodular iron produced with other magnesium addition agents-the magnesium-nickel alloys and the magnesium-silicon alloys, for example. Furthermore, I found that the use of magnesium carbide as an addition agent yielded unexpected good results when it was combined with the conventional amount of silicon inoculating agent.
In a test that I made with an iron containing 3.33% carbon, 2.33% silicon, 0.45% manganese, 0.065% phosphorus, and 0.020% sulphur, I introduced 0.20% magnesium carbide into the molten metal. The resulting castings were a good grade of nodular iron; this, in spite of the fact that no inoculating agent Was introduced into the metal-that is, no ferro-silicon. In this case, the magnesium carbide not only provided the required magnesium, but also acted as its own inoculating agent.
In another test that I made, I divided a batch of molten iron into two portions, said molten iron being composed of 3.42% carbon, 1.99% silicon, 0.23% manganese, 0.045% phosphorus, and 0.015% sulphur. To one portion I added enough magnesium-nickel to bring the residual magnesium content of the metal up to 0.11% magnesium, and then I added 0.75% silicon. To the second portion I added enough magnesium carbide to bring the residual magnesium content of the metal up to 0.12% magnesium, and then I added 0.75% silicon. A microscopic examination of the resulting metals showed that, while the magnesium-nickel treated metal was a normal nodular iron, the magnesium carbide treated metal was an exceptionally good specimen of nodular iron; that is, for example, the magnesium carbide treatment yielded a nodular iron with an unusually high percentage of graphitic carbon and ferrite in the as-cast condition.
Generally speaking, nodular iron solidifies to form a product wherein a portion of the carbon content of the metal has formed graphite nodules surrounded by ferrite in a matrix of pearlite. With the magnesium carbide treated metal, the ferrite islands were much larger, indicatin that the use of magnesium carbide yielded a molten metal which more readily transformed into graphite nodules and ferrite than molten iron treated with conventional magnesium addition agents; furthermore, I found that this advantage of magnesium carbide over magnesium-nickel also applied to such addition agents as magnesiumcopper and magnesium-silicon.
Experiments in heat treating the carbide treated metal showed that such a metal could be completely ferritized in but a fraction of the heating time that it takes to break down the structure of a normal nodular iron.
Having now described my invention, I wish it to be understood that my invention is not to be limited to the specific forms or arrangement of steps hereinbefore described, except insofar as such limitations are specified in the appended claims.
I claim as my invention:
1. In the process wherein magnesium is alloyed with molten cast iron in the production of nodular graphite cast iron castings, the steps, which comprise: adding substantially all of said magnesium to said molten cast iron by adding magnesium carbide to said molten cast iron; and casting the molten magnesium-bearing cast iron.
2. In the process wherein magnesium is alloyed with molten cast iron in the production of nodular graphite cast iron castings, the steps, which comprise: adding substantially all of said magnesium to said molten cast iron by adding magnesium carbide to said molten cast iron; inoculating the molten magnesium-bearing cast iron with silicon; and casting the molten magnesiumbearing and inoculated cast iron.
JAMES FERNANDO JORDAN.
Name Date Millis et al. Oct. 25, 1949 Number
Claims (1)
1. IN THE PROCESS WHEREIN MAGNESIUM IS ALLOYED WITH MOLTEN CAST IRON IN THE PROPDUCTION OF NODULAR GRAPHITE CAST IRON CASTINGS. THE STEPS, WHICH COMPRISE: ADDING SUBSTANTIALLY ALL OF SAID MAGNESIUM TO SAID MOLTEN CAST IRON BY ADDING MAGNESIUM CARBIDE TO SAID MOLTEN CAST IRON: AND CASTING THE MOLTEN MAGNESIUM-BEARING CAST IRON.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US172009A US2543853A (en) | 1950-07-03 | 1950-07-03 | Process for adding magnesium to cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US172009A US2543853A (en) | 1950-07-03 | 1950-07-03 | Process for adding magnesium to cast iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2543853A true US2543853A (en) | 1951-03-06 |
Family
ID=22625994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US172009A Expired - Lifetime US2543853A (en) | 1950-07-03 | 1950-07-03 | Process for adding magnesium to cast iron |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2543853A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2663635A (en) * | 1950-11-27 | 1953-12-22 | Int Nickel Co | Addition agent and method for introducing magnesium into cast iron |
| US2870004A (en) * | 1955-02-07 | 1959-01-20 | Air Reduction | Method of producing nodular cast iron |
| US3151975A (en) * | 1960-05-04 | 1964-10-06 | Julius D Madaras | Process for treating molten ferrous metal |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2445760A (en) * | 1943-03-13 | 1948-07-27 | Timken Axle Co Detroit | Power-transmitting mechanism |
-
1950
- 1950-07-03 US US172009A patent/US2543853A/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2445760A (en) * | 1943-03-13 | 1948-07-27 | Timken Axle Co Detroit | Power-transmitting mechanism |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2663635A (en) * | 1950-11-27 | 1953-12-22 | Int Nickel Co | Addition agent and method for introducing magnesium into cast iron |
| US2870004A (en) * | 1955-02-07 | 1959-01-20 | Air Reduction | Method of producing nodular cast iron |
| US3151975A (en) * | 1960-05-04 | 1964-10-06 | Julius D Madaras | Process for treating molten ferrous metal |
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