WO1984000385A1 - Abrasive resistant white cast iron - Google Patents
Abrasive resistant white cast iron Download PDFInfo
- Publication number
- WO1984000385A1 WO1984000385A1 PCT/US1982/000976 US8200976W WO8400385A1 WO 1984000385 A1 WO1984000385 A1 WO 1984000385A1 US 8200976 W US8200976 W US 8200976W WO 8400385 A1 WO8400385 A1 WO 8400385A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cast iron
- composition
- present
- molten cast
- carbides
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
Definitions
- This invention relates to cast iron and more particularly to the improvement in the toughness and abrasive resistance of white cast iron along with a significant increase in tensile strength. More specifically, the present invention relates to a new white cast iron composition and a process for producing such cast iron having improved toughness, ductility and tensile strength while retaining desirable abrasive resistance through modification of the carbide morphology.
- Alloy white cast iron is well known to be a highly wear-resistant material formed with a carbon content generally recognized to be in excess of 11 ⁇ 2% and the capability of being alloyed with other metals, usually chromium, to combine with the carbon to form a compound of iron-chromium carbide such as M x C y .
- the inherent abrasive resistance of unalloyed cast iron is adequate to meet its intended use and therefore does not pose a problem to the user.
- the cast iron forming an industrial apparatus is subjected to particular kinds of wear the inherent mechanical properties of cast iron leave much to be desired.
- abrasive particles In another type of wear often referred to as high stress abrasion, abrasive particles, such as may be encountered in a mining operation, are crushed under grinding influence of moving metal surfaces. Stress levels involved in this operative wear process as occur typically in castings used for grinding, crushing rolls or mill liners often exceed the stress capabilities of the conventional cast iron leading to equipment failure.
- a low stress abrasion or erosion the abrasive operation to which the cast iron surfaces of the equipment are subjected are not severe stressful conditions, but yet, require high abrasive resistance.
- the gouging or grooving wear that is associated with a severe shock load requires a toughness that cast iron typically has not characteristically possessed in the past.
- a manganese steel with high plasticity and toughness has been able to meet the severe shock resistant requirements for material subjected to this type of wear.
- the hardness and abrasive resistance is usually found to be inadequate to prevent an extremely high rate of wear in the high stress abrasion operation typical in a wide range of pulverizing processes such as a rotary ball mill.
- chrome molybdenum steel and alloyed white iron may be used in various types of apparatus depending upon the requirement of toughness and the combination of abrasion resistance required.
- chromium alloyed irons with or without molybdenum or nickel additions may be used with a desirable high martensitic matrix having a carbide embedment.
- This invention also has as a further object a provision of a cast iron that is tough and wear resistant in which the carbides are of smaller than conventional average size and substantially evenly distributed throughout the matrix.
- the present invention is a unique discovery of an alloy cast iron composition
- an alloy cast iron composition comprising as a base the element iron, with or without .001% to 30% by weight singly or cumulatively vanadium, titanium, niobium, molybdenum, nickel, copper, tantalum or chromium or mixtures thereof, 2.0 to 4.5% by weight carbon forming an alloy composition and introducing .001% to 4.0% by weight boron to improve wear-resistance, toughness and tensile strength properties.
- the alloy has a solidification point between 2200°F and 2400°F and generally is in a range between 2260°F to 2300°F. This solidification point is within 15°F of the eutectic temperature of the cast iron with the selected alloying elements.
- the carbides present are in the form of globules that are approaching spherical form and are of a size that average less than 4 microns which is considerably less than the average particle size of carbides in conventional cast iron.
- an ailoy white cast iron containing .001% to 30% vanadium, titanium, niobium, molybdenum, nickel, copper, tantalum or chromium or mixtures thereof and 2.0% to 4.5% carbon forming a molten cast iron composition is provided with an entropy increasing additive such as .001% to 4.0% boron then cooling the molten cast iron composition at least 5°F below the equilibrium solidification temperature of between 2200°F and 2400°F to a super cooled temperature and thereafter solidifying the molten cast iron composition to produce globular shaped carbides having an average size less than the average conventional cast iron or carbide particle and, on the average, less than 4 microns.
- this normal rod or plate geometry of the carbides can be changed into a globular form that approximates a spherical shape producing not only the desired toughness but a significant tensile strength increase.
- This change in the morphology of the carbides of cast iron has altered the non-ductile, brittle, non-deformable cast iron of the past to one that has the capability of plastic deformation, higher tensile strength with retention of the superior wear-resistant characteristics.
- the cast iron of the present invention will bend prior to breaking and the stress level to which it is subjected is significantly higher without fracture as compared to prior known cast irons.
- the cast iron of the present invention is preferably alloyed with chromium but depending upon various additions of vanadium, titanium, niobium , tantalum, nickel , molybdenum or copper from .001% to 30% to substitute for the chromium, the properties of the resultant cast iron vary.
- the cast iron of the present invention has been found to have a tensile strength as high as 120,000 psi compared to the traditional 50,000 to 60,000 psi tensile strength of prior known cast irons.
- Typical cast irons have had a 0% elongation characteristic while the present cast iron has a 3% elongation capability.
- Those skilled in the art would immediately recognize the significant advantages of an increase in elongation or plastic deformation as providing a toughness capability so important in those apparatuses subjected to great wear and shock loading such as, for instance, crushers and pulverizers for the mining industry and also in pumps for the transportation of fluids containing abrasive solids.
- Cast iron is well recognized to be an iron-carbon composition that may be alloyed. It is generally recognized in the art that the dividing line between cast iron and steel is the solubility of carbon in iron in the solid state. At higher levels of carbon, the carbon would be in the form of free graphite unless it was alloyed.
- the alloying element used to form carbides in cast iron and to improve various properties is chromium. However, molybdenum, vanadium, titanium, copper, nickel, niobium and tantalum in any combination may optionally be added to the chromium or substitute for the chromium.
- vanadium and niobium may range from .001% to 5%, molybdenum and copper from .001% to 4%, nickel from .001% to 7% and titanium and tantalum range from .001% to 4% with the total in combination with chromium or with chromium alone should be in the range of .001% to 30%.
- the chromium is in the range of 7% to 29% and more preferably in the ranges of 25% to 28% or 14% to 22% or 7% to 12% which ranges of chromium represent the three major groups of commercial alloy white irons.
- the carbon content is preferably not less than 2% and no more than about 4.5% and preferably in the range of 2.0% to 3% for cast iron with a content of 25% to 28% chromium and 14% to 22% chromium or 2% to 3.5% for 7% to 12% chromium.
- the typical cast iron compositions outlined above can achieve a changed carbide morphology by the addition of boron generally in the range of .001% to 4% and preferably .01% to 1% and most preferably between 0.1% and 0.4%. This addition of boron is found to produce globular carbide particles but is more pronounced when the alloyed iron-carbon composition selected is related to the eutectic temperature.
- the solidification point of pure iron is about 2800 °F and as carbon is added, the solidification point decreases.
- the solidification temperature varies between 2200°F and 2400°F varying primarily in accordance with the amount of chromium present but also varying due to the selection of the particular alloying elements. More desirably it is found that the solidification temperature of the alloyed iron-carbon system should be in the range of 2260°F to 2300°F or approxi mately 2280°F plus or minus 10 to 20°F. Any specific cast iron composition with the selected alloying elements present in amounts in accordance with this invention will solidify within 15°F of the eutectic temperature for that system of cast irons formed with those particular alloying elements.
- a higher entropy value decreases the Gibbs free energy value of a liquid-solid system, and the phase with the lowest free energy will be the most stable.
- the alloy cast iron composition of this invention As the alloy cast iron composition of this invention is cooled below the equilibrium solidification temperature into the super cooling range of at least 5°F below the equilibrium solidification temperature, when the solidification does occur it is more instantaneous than when super cooling does not take place. Thus, the super cooling avoids the usual lengthy period of crystal or particle growth that conventionally occurs. Rather, the solidification is more rapid before the growth of the particles can be achieved. Thus, the minute carbide particles instead of agglomerating into rods or plates as occurs in the conventional cast iron do not have the opportunity to agglomerate with the rapid solidification in the alloy cast iron composition of the present invention nor is there a migration of these particles to agglomerate to form a plate or rod so as to produce non-uniformity in the distribution of the carbides.
- the uniformity in the carbide distribution is inherent in the melt phase even during the super cooling phase of the alloy cast iron composition so that the uniformity of the carbide distribution is retained during solidification.
- the result of solidification of the super cooled melt below the equilibrium solidification temperature is a substantial reduction in the size of the particle and a more uniform distribution of the carbides throughout the matrix of the cast iron which is the basis for the strength, toughness and abrasion resistance of the cast iron composition of the present invention.
- a typical cast iron composition containing 27.2% chromium, 2.04% carbon is an alloy composition with solidification in the range of 2280°F which is above the eutectic temperature of about 2263°F. With the addition of 0.17% boron the alloy can be super cooled to a temperature of 5 degrees below that equilibrium solidification temperature and to about slightly below 2275°F. Between this temperature point and below the equilibrium solidification temperature the melt is super cooled and remains liquid. Further cooling produces carbides having a globular shape that is nearly spherical and of an average particle size of less than 4 microns. The tensile strength of the resulting cast iron is in the range of 120,000 psi with approximately 3% elongation permitted. Such a white cast iron is quite wear-resistant and additionally has improved tensile strength and toughness characteristics that make it particularly useful in high wear and stress operations.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP50253882A JPS59501551A (ja) | 1982-07-19 | 1982-07-19 | 耐摩耗性白鋳鉄 |
CH378486A CH660753A5 (fr) | 1982-07-19 | 1982-07-19 | Procede de refroidissement avec surfusion d'une fonte liquide. |
PCT/US1982/000976 WO1984000385A1 (en) | 1982-07-19 | 1982-07-19 | Abrasive resistant white cast iron |
DE19823390167 DE3390167T1 (de) | 1982-07-19 | 1982-07-19 | Abriebsbeständiger Weißguß |
NL8220290A NL8220290A (nl) | 1982-07-19 | 1982-07-19 | Wit gietijzer bestand tegen schurende inwerking. |
CH144184A CH661286A5 (fr) | 1982-07-19 | 1982-07-19 | Fonte alliee resistant a l'abrasion. |
GB08406512A GB2134542B (en) | 1982-07-19 | 1982-07-19 | Abrasive resistant white cast iron |
AU88249/82A AU557815B2 (en) | 1982-07-19 | 1982-07-19 | Abrasive resistant white cast iron |
EP19820902587 EP0113715A4 (en) | 1982-07-19 | 1982-07-19 | ABRASIVE WHITE CAST IRON. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US1982/000976 WO1984000385A1 (en) | 1982-07-19 | 1982-07-19 | Abrasive resistant white cast iron |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1984000385A1 true WO1984000385A1 (en) | 1984-02-02 |
Family
ID=22168102
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1982/000976 WO1984000385A1 (en) | 1982-07-19 | 1982-07-19 | Abrasive resistant white cast iron |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0113715A4 (nl) |
JP (1) | JPS59501551A (nl) |
AU (1) | AU557815B2 (nl) |
CH (2) | CH661286A5 (nl) |
DE (1) | DE3390167T1 (nl) |
GB (1) | GB2134542B (nl) |
NL (1) | NL8220290A (nl) |
WO (1) | WO1984000385A1 (nl) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0159981A1 (en) * | 1983-10-24 | 1985-11-06 | Giw Industries Inc. | Abrasive resistant white cast iron |
EP0197741A2 (en) * | 1985-04-02 | 1986-10-15 | Reed Tool Company Limited | Improvements in or relating to rotary drill bits and methods of manufacture thereof |
WO2015157169A3 (en) * | 2014-04-07 | 2015-12-03 | Scoperta, Inc. | Fine-grained high carbide cast iron alloys |
US9738959B2 (en) | 2012-10-11 | 2017-08-22 | Scoperta, Inc. | Non-magnetic metal alloy compositions and applications |
US9802387B2 (en) | 2013-11-26 | 2017-10-31 | Scoperta, Inc. | Corrosion resistant hardfacing alloy |
US10100388B2 (en) | 2011-12-30 | 2018-10-16 | Scoperta, Inc. | Coating compositions |
US10105796B2 (en) | 2015-09-04 | 2018-10-23 | Scoperta, Inc. | Chromium free and low-chromium wear resistant alloys |
US10173290B2 (en) | 2014-06-09 | 2019-01-08 | Scoperta, Inc. | Crack resistant hardfacing alloys |
US10329647B2 (en) | 2014-12-16 | 2019-06-25 | Scoperta, Inc. | Tough and wear resistant ferrous alloys containing multiple hardphases |
US10465267B2 (en) | 2014-07-24 | 2019-11-05 | Scoperta, Inc. | Hardfacing alloys resistant to hot tearing and cracking |
US10465269B2 (en) | 2014-07-24 | 2019-11-05 | Scoperta, Inc. | Impact resistant hardfacing and alloys and methods for making the same |
US10851444B2 (en) | 2015-09-08 | 2020-12-01 | Oerlikon Metco (Us) Inc. | Non-magnetic, strong carbide forming alloys for powder manufacture |
US10954588B2 (en) | 2015-11-10 | 2021-03-23 | Oerlikon Metco (Us) Inc. | Oxidation controlled twin wire arc spray materials |
US11279996B2 (en) | 2016-03-22 | 2022-03-22 | Oerlikon Metco (Us) Inc. | Fully readable thermal spray coating |
US11939646B2 (en) | 2018-10-26 | 2024-03-26 | Oerlikon Metco (Us) Inc. | Corrosion and wear resistant nickel based alloys |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19901170B4 (de) * | 1998-10-21 | 2006-11-23 | Reiloy Metall Gmbh | Verwendung einer Eisenbasishartlegierung |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2978320A (en) * | 1958-12-29 | 1961-04-04 | Gen Motors Corp | Method for producing a high strength ferrous metal |
NL6917161A (nl) * | 1969-09-15 | 1971-03-17 | ||
SU618444A1 (ru) * | 1976-04-12 | 1978-08-05 | Предприятие П/Я М-5356 | Чугун |
SU729273A1 (ru) * | 1978-05-10 | 1980-04-25 | Институт Проблем Литья Ан Украинской Сср | Чугун |
US4221612A (en) * | 1977-10-14 | 1980-09-09 | Acieries Thome Cromback | Grinding members |
JPS5693859A (en) * | 1979-12-28 | 1981-07-29 | Komatsu Ltd | Ball alloy for grinding |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH189692A (fr) * | 1935-05-17 | 1937-03-15 | Ind Research Lab Ltd | Alliage ferreux très dur. |
FR1089531A (fr) * | 1953-07-03 | 1955-03-18 | Cie De Pont A Mousson | Fonte résistant aux agents chimiques et, en particulier, aux fumées |
SU121467A2 (ru) * | 1958-06-05 | 1958-11-30 | Б.М. Конторов | Износоустойчивый сплав |
US3012880A (en) * | 1960-11-28 | 1961-12-12 | Union Carbide Corp | Iron-base alloy |
NL6516411A (nl) * | 1964-12-18 | 1966-06-20 | ||
FR1600084A (nl) * | 1968-12-30 | 1970-07-20 | ||
US3658515A (en) * | 1970-06-22 | 1972-04-25 | Xaloy Inc | Hard wear-resistant ferrous alloy |
JPS5419371B2 (nl) * | 1973-02-15 | 1979-07-14 | ||
JPS53140218A (en) * | 1977-05-13 | 1978-12-07 | Mitsubishi Heavy Ind Ltd | Wear resistant white pig iron |
JPS5751241A (en) * | 1980-09-12 | 1982-03-26 | Komatsu Ltd | Ball alloy for pulverization |
-
1982
- 1982-07-19 EP EP19820902587 patent/EP0113715A4/en not_active Withdrawn
- 1982-07-19 AU AU88249/82A patent/AU557815B2/en not_active Ceased
- 1982-07-19 CH CH144184A patent/CH661286A5/fr not_active IP Right Cessation
- 1982-07-19 CH CH378486A patent/CH660753A5/fr not_active IP Right Cessation
- 1982-07-19 JP JP50253882A patent/JPS59501551A/ja active Pending
- 1982-07-19 GB GB08406512A patent/GB2134542B/en not_active Expired
- 1982-07-19 WO PCT/US1982/000976 patent/WO1984000385A1/en not_active Application Discontinuation
- 1982-07-19 NL NL8220290A patent/NL8220290A/nl not_active Application Discontinuation
- 1982-07-19 DE DE19823390167 patent/DE3390167T1/de not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2978320A (en) * | 1958-12-29 | 1961-04-04 | Gen Motors Corp | Method for producing a high strength ferrous metal |
NL6917161A (nl) * | 1969-09-15 | 1971-03-17 | ||
SU618444A1 (ru) * | 1976-04-12 | 1978-08-05 | Предприятие П/Я М-5356 | Чугун |
US4221612A (en) * | 1977-10-14 | 1980-09-09 | Acieries Thome Cromback | Grinding members |
SU729273A1 (ru) * | 1978-05-10 | 1980-04-25 | Институт Проблем Литья Ан Украинской Сср | Чугун |
JPS5693859A (en) * | 1979-12-28 | 1981-07-29 | Komatsu Ltd | Ball alloy for grinding |
Non-Patent Citations (1)
Title |
---|
See also references of EP0113715A4 * |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0159981A4 (en) * | 1983-10-24 | 1987-04-29 | Giw Ind Inc | WEAR-RESISTANT WHITE CAST IRON. |
EP0159981A1 (en) * | 1983-10-24 | 1985-11-06 | Giw Industries Inc. | Abrasive resistant white cast iron |
EP0197741A2 (en) * | 1985-04-02 | 1986-10-15 | Reed Tool Company Limited | Improvements in or relating to rotary drill bits and methods of manufacture thereof |
EP0197741A3 (en) * | 1985-04-02 | 1988-03-16 | Reed Tool Company Limited | Improvements in or relating to rotary drill bits and methods of manufacture thereof |
US10100388B2 (en) | 2011-12-30 | 2018-10-16 | Scoperta, Inc. | Coating compositions |
US11085102B2 (en) | 2011-12-30 | 2021-08-10 | Oerlikon Metco (Us) Inc. | Coating compositions |
US9738959B2 (en) | 2012-10-11 | 2017-08-22 | Scoperta, Inc. | Non-magnetic metal alloy compositions and applications |
US9802387B2 (en) | 2013-11-26 | 2017-10-31 | Scoperta, Inc. | Corrosion resistant hardfacing alloy |
WO2015157169A3 (en) * | 2014-04-07 | 2015-12-03 | Scoperta, Inc. | Fine-grained high carbide cast iron alloys |
US11130205B2 (en) | 2014-06-09 | 2021-09-28 | Oerlikon Metco (Us) Inc. | Crack resistant hardfacing alloys |
US10173290B2 (en) | 2014-06-09 | 2019-01-08 | Scoperta, Inc. | Crack resistant hardfacing alloys |
US11111912B2 (en) | 2014-06-09 | 2021-09-07 | Oerlikon Metco (Us) Inc. | Crack resistant hardfacing alloys |
US10465267B2 (en) | 2014-07-24 | 2019-11-05 | Scoperta, Inc. | Hardfacing alloys resistant to hot tearing and cracking |
US10465269B2 (en) | 2014-07-24 | 2019-11-05 | Scoperta, Inc. | Impact resistant hardfacing and alloys and methods for making the same |
US10329647B2 (en) | 2014-12-16 | 2019-06-25 | Scoperta, Inc. | Tough and wear resistant ferrous alloys containing multiple hardphases |
US10105796B2 (en) | 2015-09-04 | 2018-10-23 | Scoperta, Inc. | Chromium free and low-chromium wear resistant alloys |
US11253957B2 (en) | 2015-09-04 | 2022-02-22 | Oerlikon Metco (Us) Inc. | Chromium free and low-chromium wear resistant alloys |
US10851444B2 (en) | 2015-09-08 | 2020-12-01 | Oerlikon Metco (Us) Inc. | Non-magnetic, strong carbide forming alloys for powder manufacture |
US10954588B2 (en) | 2015-11-10 | 2021-03-23 | Oerlikon Metco (Us) Inc. | Oxidation controlled twin wire arc spray materials |
US11279996B2 (en) | 2016-03-22 | 2022-03-22 | Oerlikon Metco (Us) Inc. | Fully readable thermal spray coating |
US11939646B2 (en) | 2018-10-26 | 2024-03-26 | Oerlikon Metco (Us) Inc. | Corrosion and wear resistant nickel based alloys |
Also Published As
Publication number | Publication date |
---|---|
AU8824982A (en) | 1984-02-08 |
EP0113715A4 (en) | 1985-04-24 |
GB2134542B (en) | 1987-06-03 |
NL8220290A (nl) | 1984-06-01 |
GB2134542A (en) | 1984-08-15 |
GB8406512D0 (en) | 1984-04-18 |
JPS59501551A (ja) | 1984-08-30 |
EP0113715A1 (en) | 1984-07-25 |
CH661286A5 (fr) | 1987-07-15 |
CH660753A5 (fr) | 1987-06-15 |
AU557815B2 (en) | 1987-01-08 |
DE3390167T1 (de) | 1984-11-29 |
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