EP0312068A1 - Procédé pour la nitruration de la fonte - Google Patents
Procédé pour la nitruration de la fonte Download PDFInfo
- Publication number
- EP0312068A1 EP0312068A1 EP88117062A EP88117062A EP0312068A1 EP 0312068 A1 EP0312068 A1 EP 0312068A1 EP 88117062 A EP88117062 A EP 88117062A EP 88117062 A EP88117062 A EP 88117062A EP 0312068 A1 EP0312068 A1 EP 0312068A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cast iron
- nitrogen
- agent
- weight
- ppm
- 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.)
- Ceased
Links
- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims description 11
- 238000005121 nitriding Methods 0.000 title abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 21
- 229910052742 iron Inorganic materials 0.000 claims abstract description 14
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 13
- 239000011651 chromium Substances 0.000 claims abstract description 13
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 13
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 12
- 239000011572 manganese Substances 0.000 claims abstract description 12
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 11
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000004202 carbamide Substances 0.000 claims abstract description 9
- 239000010703 silicon Substances 0.000 claims abstract description 9
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000654 additive Substances 0.000 claims abstract description 8
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- MVXMNHYVCLMLDD-UHFFFAOYSA-N 4-methoxynaphthalene-1-carbaldehyde Chemical compound C1=CC=C2C(OC)=CC=C(C=O)C2=C1 MVXMNHYVCLMLDD-UHFFFAOYSA-N 0.000 claims abstract description 6
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 claims abstract description 6
- 235000010299 hexamethylene tetramine Nutrition 0.000 claims abstract description 6
- 239000004312 hexamethylene tetramine Substances 0.000 claims abstract description 6
- 150000004767 nitrides Chemical class 0.000 claims abstract description 6
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 claims abstract description 5
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims abstract description 4
- YZEZMSPGIPTEBA-UHFFFAOYSA-N 2-n-(4,6-diamino-1,3,5-triazin-2-yl)-1,3,5-triazine-2,4,6-triamine Chemical compound NC1=NC(N)=NC(NC=2N=C(N)N=C(N)N=2)=N1 YZEZMSPGIPTEBA-UHFFFAOYSA-N 0.000 claims abstract description 3
- XZMCDFZZKTWFGF-UHFFFAOYSA-N Cyanamide Chemical compound NC#N XZMCDFZZKTWFGF-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229920000877 Melamine resin Polymers 0.000 claims abstract description 3
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000002253 acid Substances 0.000 claims abstract description 3
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims abstract description 3
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 claims abstract description 3
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims abstract description 3
- YSRVJVDFHZYRPA-UHFFFAOYSA-N melem Chemical compound NC1=NC(N23)=NC(N)=NC2=NC(N)=NC3=N1 YSRVJVDFHZYRPA-UHFFFAOYSA-N 0.000 claims abstract description 3
- 150000003918 triazines Chemical class 0.000 claims abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 118
- 229910052757 nitrogen Inorganic materials 0.000 claims description 65
- 229910002804 graphite Inorganic materials 0.000 claims description 15
- 239000010439 graphite Substances 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 238000009956 embroidering Methods 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 4
- 239000008187 granular material Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 241000219112 Cucumis Species 0.000 claims description 2
- 235000015510 Cucumis melo subsp melo Nutrition 0.000 claims description 2
- FJJCIZWZNKZHII-UHFFFAOYSA-N [4,6-bis(cyanoamino)-1,3,5-triazin-2-yl]cyanamide Chemical compound N#CNC1=NC(NC#N)=NC(NC#N)=N1 FJJCIZWZNKZHII-UHFFFAOYSA-N 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 3
- 230000000996 additive effect Effects 0.000 claims 2
- -1 nitrogen-containing compound Chemical class 0.000 claims 1
- 244000064895 Cucumis melo subsp melo Species 0.000 abstract 1
- 239000010949 copper Substances 0.000 description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 238000005275 alloying Methods 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 229910001562 pearlite Inorganic materials 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 229910017464 nitrogen compound Inorganic materials 0.000 description 5
- 150000002830 nitrogen compounds Chemical class 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 4
- 230000006698 induction Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 239000002054 inoculum Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910019590 Cr-N Inorganic materials 0.000 description 1
- 229910019588 Cr—N Inorganic materials 0.000 description 1
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 229910005347 FeSi Inorganic materials 0.000 description 1
- 229910018648 Mn—N Inorganic materials 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 229910002065 alloy metal Inorganic materials 0.000 description 1
- HAMNKKUPIHEESI-UHFFFAOYSA-N aminoguanidine Chemical compound NNC(N)=N HAMNKKUPIHEESI-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 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 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 229960005486 vaccine Drugs 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
-
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/08—Manufacture of cast-iron
Definitions
- the invention relates to means for embroidering cast iron with lamellar graphite or spheroidal graphite and methods for introducing the agent into the cast iron melt.
- the material grades of cast iron with lamellar graphite are standardized. They are based on the tensile strength of a test bar with a raw casting diameter of 30 mm.
- the tensile strength is influenced by the graphite formation, the amount of graphite and the basic structure, which can have a pearlitic / ferritic to pearlitic structure.
- the structure of the basic structure can be specifically influenced by adding alloying elements.
- the pearlite structure is stabilized with increasing effectiveness by the elements manganese, chrome, copper and tin.
- the addition of these elements to cast iron represents a significant cost factor (e.g. copper and tin) and can only be done up to certain upper limits for chrome and manganese.
- alloying elements such as manganese and chromium increase the risk of ledeburitic solidification, so that they can only be used up to a maximum of 1 or 0.5% by weight without a negative effect on the machinability of the cast iron.
- care must also be taken to ensure that the chromium content does not degrade even after repeated remelting.
- copper This fact also places limits on the alloying of copper, although it enables pearlite stabilization without additional risk of ledeburitic solidification.
- only relatively expensive high-purity copper may be used in order to exclude the harmful effects of trace elements that may be contained in the copper.
- Chromium and copper alloyed circuit material has considerable disadvantages.
- a very effective pearlite stabilization is achieved with tin, but the costs are significant. With this element, a fully pearlitic structure is achieved in all areas of the casting. A further addition of tin to a cast iron, which already has a fully pearlitic structure, no longer increases its tensile strength.
- DE-OS 24 02 945 describes high-strength cast iron with spheroidal graphite and a process for its production. Nitriding to contents of 0.0035 to 0.02% by weight of N takes place by means of alloys containing N such as Fe-Mn-N and Fe-Cr-N or with hexamine.
- the nitrogen supply and thus the nitrogen yield is relatively broad.
- the nitrogen yield is very low, so that the alloys have to be added in relatively large amounts, which in turn has undesirable effects such as introducing a relatively large amount of foreign metal, increased slag accumulation and inadequate dissolving behavior of the nitrogen.
- Hexamine as explosive explosive (Textbook of Organic Chemistry, Paul Karrer, 1963, p. 500) is dangerous.
- the solubility equilibrium for nitrogen in cast iron is affected by the alloying elements and the temperature of the molten iron. In the usual temperature range of 1400 to 1550 ° C, the solubility equilibrium for nitrogen in technical cast iron alloys is 40 to 60 ppm. The consequence of this is that all nitrogen contents which are above the value of this solubility equilibrium are unstable. The nitrogen loss is usually 10 ppm per 30 minutes of melt life at 1480 ° C. A subsequent correction of the nitrogen content by adding further N-containing alloys is no longer possible due to the associated increase in the manganese or chromium values, since this would cause undesired ledeburitic solidification of the cast iron.
- the object of the invention is therefore to provide a means and a method which permits simple, inexpensive pearlite stabilization or strength increase by working with a high nitrogen yield by increasing the pearlite content in cast iron with lamellar graphite or spheroidal graphite.
- an agent for nitriding cast iron which is characterized in that it contains at least 50% by weight of nitrogen-containing compounds having an NCN structure or / and mixtures of calcium cyanamide with nitrides of silicon, ferrosilicon, manganese and chromium or consists of it.
- nitrogen compounds give a high nitrogen yield without introducing undesirable alloy metals.
- Advantageously used as nitrogen compounds are those with a high nitrogen content which are cheaply available on an industrial scale. This includes in particular cyanamide, dicyandiamide, guanidine, aminoguanidine, urea, hexamethylenetetramine, cyanuric acid, azulmic acid, melamine, melam, melem, melon, polymeric triazine compounds and guanamines, which are preferred.
- nitrogen compounds preferred in the agent according to the invention have the property of disintegrating into gaseous products in the cast iron melt, as a result of which slag formation is avoided.
- calcium cyanamide e.g. used in its technical form as calcium cyanamide and its mixtures with nitrides of silicon, ferrosilicon, manganese and chromium.
- the agent according to the invention also contains additives which bring about an acceleration or deceleration of the reaction in the cast iron melt in an amount of 0.5 to 50% by weight and essentially consist of carbon, iron or / and silicon.
- Suitable additives are flame carbon, ferrosilicon, iron, graphite, finely divided silica and silica-containing dusts, which can be used to optimize the nitrogen yield depending on the nitrogen compound used and the N requirement.
- the agent preferably contains 10 to 35% by weight of one of the additives mentioned.
- the nitriding can be carried out in the temperature range from 1200 to 1600 ° C.
- composition of the agent at different temperatures is explained in more detail in the examples.
- a mixture of about 97% by weight of urea and about 3% by weight of flame carbon is preferred (example 2).
- urea is preferably used for nitriding (example 1), and at a temperature of 1460 ° C., for example, a mixture of 35% by weight of urea, 35% by weight of dicyandiamide and 30% by weight is used.
- -% Ferrosilicon 75 added to the iron smelter (Example 3).
- the amount of the agent is low. Depending on the type of agent, the form of application and the desired increase in strength, 0.1 to 6 kg of agent are used per ton of cast iron. An amount of 0.5 to 1 kg of the agent is preferably used in order to establish a nitrogen content of 50 to 200 ppm in lamellar graphite or spheroidal graphite cast iron.
- the tensile strength (Rm) of this quality should be increased by embroidering the molten cast iron by 50 N / mm2 ( ⁇ Rm). Increasing the amount of nitrogen by 10 ppm free nitrogen improves the tensile strength by 7 N / mm2.
- the nitrogen content of the untreated cast iron is 42 ppm.
- the subsequently measured nitrogen concentration of 152 ppm in cast iron corresponds to a nitrogen yield of 32.5%.
- the tensile strength measured on the 30 mm test bar, was increased from 260 to 315 N / mm 2.
- the tensile strength was to be increased by 50 N / mm 2 as in Example 1.
- a cored wire with a diameter of 13 mm is used, which contains a mixture of 97% by weight of urea and 3% by weight of flame carbon. Its filling weight is 120 g / m, the nitrogen content is 54 g / m.
- the aim is to increase the tensile strength, measured on the test bar of 30 mm in diameter, by 50 N / mm2.
- the nitrogen concentrations required to increase the tensile strength are calculated in accordance with Example 1 and give 41 ppm.
- a 9 mm diameter cored wire is used to embroider the cast iron melt 35% by weight urea 35% by weight dicyandiamide 30% by weight FeSi 75 contains.
- the fill weight of this wire is 34 g / m, the nitrogen content is 29 g / m.
- the tensile strength measured on a 30 mm test bar, was increased from 210 to 264 N / mm2.
- a 9 mm diameter cored wire is used to embroider the cast iron melt to this value 97% by weight of calcium cyanamide and 3% by weight flame coal contains.
- the tensile strength measured on the 30 mm test bar, increased from 210 to 258 N / mm2.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3734877 | 1987-10-15 | ||
| DE3734877A DE3734877C1 (de) | 1987-10-15 | 1987-10-15 | Mittel und Verfahren zur Aufstickung von Gusseisen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0312068A1 true EP0312068A1 (fr) | 1989-04-19 |
Family
ID=6338365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88117062A Ceased EP0312068A1 (fr) | 1987-10-15 | 1988-10-13 | Procédé pour la nitruration de la fonte |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4970051A (fr) |
| EP (1) | EP0312068A1 (fr) |
| JP (1) | JPH01136918A (fr) |
| DE (1) | DE3734877C1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2458995C1 (ru) * | 2011-03-10 | 2012-08-20 | Владимир Константинович Афанасьев | Способ обработки расплава чугуна |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9950966B2 (en) | 2012-07-05 | 2018-04-24 | Gestalt Chemical Products, Inc. | Manufacturing of nitrogen-containing materials |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1225215B (de) * | 1964-08-20 | 1966-09-22 | Elektrometallurgie M B H Ges | Verfahren zur Herstellung eines stickstoffhaltigen Stahlveredlers |
| US3322530A (en) * | 1962-08-24 | 1967-05-30 | Ishikawajima Harima Heavy Ind | Method for adding additives to molten steel |
| BE791836A (fr) * | 1972-11-23 | 1973-03-16 | Centre Rech Metallurgique | Procede pour la renitruration des aciers. |
| DE1608409B2 (de) * | 1968-03-13 | 1975-08-07 | Buderus'sche Eisenwerke, 6330 Wetzlar | GuBeisenlegierung mit Stickstorfzusatz |
| BE840404A (fr) * | 1976-04-05 | 1976-08-02 | Procede de preparation d'elements pour la renitruration | |
| DE2807930A1 (de) * | 1978-02-24 | 1979-09-06 | Maschf Augsburg Nuernberg Ag | Verfahren zum giessen von werkstuecken, insbesondere von giesskokillen hoher temperaturwechselbestaendigkeit |
| EP0015662A1 (fr) * | 1979-02-28 | 1980-09-17 | International Harvester Company | Procédé de traitement d'un bain de fonte dans une poche de coulée par un fil de magnésium entouré d'une gaine |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE13992C (de) * | J. HtRD in Bishopston (England) | Bogenabnehmer für Papiermaschinen | ||
| DE1229122B (de) * | 1962-05-11 | 1966-11-24 | Ishikawajima Harima Heavy Ind | Verfahren zum Aufsticken von Stahlschmelzen |
| JPS543129B2 (fr) * | 1973-01-24 | 1979-02-19 | ||
| JPS5535461B2 (fr) * | 1974-08-16 | 1980-09-13 | ||
| US4560409A (en) * | 1984-08-29 | 1985-12-24 | Superior Graphite | Metal bearing graphitic carbons |
| BR8606249A (pt) * | 1985-12-17 | 1987-09-29 | Sueddeutsche Kalkstickstoff | Composicao finamente granulada para a dessulfuracao de ferro fundido e processo para sua preparacao |
-
1987
- 1987-10-15 DE DE3734877A patent/DE3734877C1/de not_active Expired
-
1988
- 1988-09-30 US US07/251,561 patent/US4970051A/en not_active Expired - Fee Related
- 1988-10-13 EP EP88117062A patent/EP0312068A1/fr not_active Ceased
- 1988-10-13 JP JP63256095A patent/JPH01136918A/ja active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3322530A (en) * | 1962-08-24 | 1967-05-30 | Ishikawajima Harima Heavy Ind | Method for adding additives to molten steel |
| DE1225215B (de) * | 1964-08-20 | 1966-09-22 | Elektrometallurgie M B H Ges | Verfahren zur Herstellung eines stickstoffhaltigen Stahlveredlers |
| DE1608409B2 (de) * | 1968-03-13 | 1975-08-07 | Buderus'sche Eisenwerke, 6330 Wetzlar | GuBeisenlegierung mit Stickstorfzusatz |
| BE791836A (fr) * | 1972-11-23 | 1973-03-16 | Centre Rech Metallurgique | Procede pour la renitruration des aciers. |
| BE840404A (fr) * | 1976-04-05 | 1976-08-02 | Procede de preparation d'elements pour la renitruration | |
| DE2807930A1 (de) * | 1978-02-24 | 1979-09-06 | Maschf Augsburg Nuernberg Ag | Verfahren zum giessen von werkstuecken, insbesondere von giesskokillen hoher temperaturwechselbestaendigkeit |
| EP0015662A1 (fr) * | 1979-02-28 | 1980-09-17 | International Harvester Company | Procédé de traitement d'un bain de fonte dans une poche de coulée par un fil de magnésium entouré d'une gaine |
Non-Patent Citations (1)
| Title |
|---|
| DEB-D13992, DEGUSSA, 26-08-1954 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2458995C1 (ru) * | 2011-03-10 | 2012-08-20 | Владимир Константинович Афанасьев | Способ обработки расплава чугуна |
Also Published As
| Publication number | Publication date |
|---|---|
| US4970051A (en) | 1990-11-13 |
| JPH01136918A (ja) | 1989-05-30 |
| DE3734877C1 (de) | 1988-10-27 |
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