Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
  • C10M169/04—Mixtures of base-materials and additives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M103/00—Lubricating compositions characterised by the base-material being an inorganic material
  • C10M103/06—Metal compounds
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
  • C10M2201/06—Metal compounds
  • C10M2201/062—Oxides; Hydroxides; Carbonates or bicarbonates
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
  • C10M2201/085—Phosphorus oxides, acids or salts
  • C10M2201/0853—Phosphorus oxides, acids or salts used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2010/00—Metal present as such or in compounds
  • C10N2010/02—Groups 1 or 11
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2010/00—Metal present as such or in compounds
  • C10N2010/04—Groups 2 or 12
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2010/00—Metal present as such or in compounds
  • C10N2010/06—Groups 3 or 13
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/08—Resistance to extreme temperature
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/20—Metal working
  • C10N2040/241—Manufacturing joint-less pipes
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
  • C10N2050/015—Dispersions of solid lubricants
  • C10N2050/02—Dispersions of solid lubricants dissolved or suspended in a carrier which subsequently evaporates to leave a lubricant coating
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
  • C10N2050/08—Solids

Definitions

• the invention relates to high-temperature lubricants for the lubrication of two surface-contacting heated metal objects which perform a relative movement to one another.
• the quality of the inner pipe surface depends on the surface quality of the mandrel bars. If the inner surface of the tubes is rough or wavy, or even shows signs of damage due to the quality of the mandrels, you will get a high scrap rate. Attempts have therefore already been made in the past to increase the service life of the mandrel bars by applying lubricants to them.
• salt mixtures have already been used as high-temperature lubricants, which melt at the working temperatures at which they are used as lubricants and ensure good lubricating properties in the liquid state.
• Such salt mixtures are known from EP-OS 0 829 528 which additionally contain a gas-forming additive for improvement.
• lines 41 to 48 of this Do- kumentes is an advantage of this lubricant, that they start to melt up to 250 C at 200 C and even present as clear melt at 500 ° C. This should ensure good lubricating properties even at low temperatures.
• the object underlying the invention was therefore to obtain a high-temperature lubricant to which no graphite has to be added and which reduces the rejection rates compared to the use of known lubricants.
• the new lubricants are intended to increase the service life of mandrel bars in metal pipe manufacture and improve the quality of the inner pipe surfaces.
• This object is achieved according to the invention with high-temperature lubricants for the lubrication of two surface-contacting heated metal objects which perform a relative movement to one another in that the lubricant consists of at least 80% by weight of at least one alkali orthophosphate and a melting temperature above the maximum working temperature of the has heated metal objects.
• alkali phosphates in such lubricants make up only a relatively small percentage and are mixed with other salts in such a way that the lubricant is in the molten, i.e. liquid, state at the working temperatures.
• the high-temperature lubricants according to the invention can be used wherever, at high temperatures, two metal objects touching one another make a relative movement to one another. These are, for example, plain bearings in which high temperatures can occur.
• the lubricants according to the invention are preferably used where the metal objects that come into contact with one another are on the one hand a tool and on the other hand a workpiece.
• the lubricants are particularly suitable for the lubrication of mandrel bars in the manufacture of seamless metal pipes.
• the idea of the invention is suitable for the lubrication of any metal objects, but is particularly suitable for the processing of steel objects, in particular, as mentioned above, for the production of seamless steel tubes in which the mandrel rods are lubricated with the lubricant according to the invention.
• this should not rule out the use of the lubricants according to the invention, for example for the production of tubes from non-ferrous metals, aluminum or the like. If we are talking about maximum working temperatures, this is the highest temperature that occurs at the lubricated contact surface, since if the melting temperature of the lubricant was below it, the lubricant could melt, which should be avoided.
• the workpiece When machining workpieces with one tool, the workpiece will usually have the higher temperature and the tool the lower temperature, as in the case of using mandrel bars in the manufacture of metal pipes.
• the maximum working temperature above which the melting temperature of the lubricant should lie is the temperature of the hotter metal object, ie the workpiece.
• the high-temperature lubricant according to the invention is expediently in the form of an aqueous solution.
• This is, for example, sprayed onto the mandrel rods during tube production or applied in some other way and, after the water has evaporated, forms a fine separating and lubricating film which is extremely abrasion-resistant when used. Since the lubricant does not melt during use due to its high melting temperature, scale is prevented from being fixed on the mandrel rod surface or other tool surface by the lubricant. After drying, the lubricant is in the form of very fine particles that fill all the surface roughness of the tool surface and thus smooth this surface, which is transferred to the workpiece surface.
• the separating film formed also favors the material flow of the metal to be formed on the tool surface and therefore has the property of an excellent lubricating film.
• the high-temperature lubricant according to the invention is particularly suitable in the Assel rolling process with the technology of the "free mandrel bar” and in the push bench process. Also in continuous rolling, e.g. B. according to the "semifloating" principle, significant advantages are achieved in terms of surface quality, the service life of the mandrels and the effort between the rolling stands.
• the lubricants according to the invention can be used to easily produce clear, high-percentage solutions which are to be applied to the mandrels by means of an airless pump and nozzles. Spraying is also possible using air, so-called two-component nozzles or the like. The lubricant can of course also be applied in powder form.
• the melting temperature of the lubricant according to the invention is advantageously at least 10 ° C above the maximum working temperature defined above.
• the lubricant should largely consist of one or more alkali orthophosphates, the content of alkali orthophosphate is expediently at least 95% by weight. If several Alkali orthophosphates are used, it must be ensured that the melting temperature is above the maximum working temperature even with such mixtures.
• lubricant can consist of other substances, which may also include small amounts of graphite, but this is generally not preferred.
• alkali orthophosphates are trisodium orthophosphate with a melting temperature of 1583 ° C, tripotassium orthophosphate with a melting temperature of 1340 ° C and trilithium orthophosphate with a melting temperature of 857 ° C. Trisodium orthophosphate and tripotassium orthophosphate are preferred, especially the latter. If the melting temperature of the lubricant remains high enough, other phosphates can also be added in small quantities.
• alkali aluminate and / or alkali zincate improves the fineness of the lubricant particles and thus the lubricant's adhesion to the metal surface. It is therefore preferred to add at least one alkali aluminate and / or at least one alkali zincate to the lubricant in an amount of at most 5% by weight, preferably 0.2 to 3% by weight.
• the superfine particles of the lubricant settle in all the depressions in the surface and form their seal, so that the scale cannot sit in these depressions.
• the lubricating effect can also be explained as smoothing.
• the actual melting temperature of the lubricant according to the invention depends on the maximum working temperature when the lubricant is used and thus on the nature of the heated metal objects touching one another.
• the melting temperature of the lubricant can be relatively low if it is to be used to produce pipes from non-ferrous metal or aluminum, since comparatively low working temperatures are used with these metallic materials.
• a lubricant with considerably higher melting temperatures must be used, which in turn depends on whether chrome-nickel steels with working temperatures of around 1050 to 1100 ° C or steels with higher working temperatures are used.
• the melting temperature for the lubrication of tools for steel workpieces is expediently above 1100 ° C., preferably above 1200 ° C.
• the melting temperatures can be, for example, 600 or 650 ° C.
• Lubricants with different melting temperatures which can be easily achieved by varying the components and amounts of the mixture. It is then easy to select the appropriate lubricant for each work process, the melting temperature of which is known.
• a mixture of 99% by weight of tripotassium orthophosphate and 1% by weight of sodium zincate (in each case based on the solids content of the lubricant) was poured into the tank as a 10% strength aqueous solution in a tank with a free mandrel bar of the rolling process for cooling the bars.
• the temperature of the bath and mandrel bar was 80 to 90 ° C. After drying the woodlouse was covered with a white film of lubricant.
• the Assel mill was used to roll light to medium alloy steels.
• the service life of the woodlorn mandrel was increased by 25% compared to woodlorn mandrel lubricated with known lubricant.
• the roughness depth measurements of the inner surface of the manufactured pipes, which were used for roller bearings, showed a reduction from 22 ⁇ m to 10 ⁇ m.
• the mandrels with a diameter of 130 mm were sprayed in a tube ram bench system by spraying a 20% lubricant solution made from 98% by weight tripotassium orthophosphate and
• the mandrels had a temperature of 450 ° C. It became a white coherent
• Lubricant layer generated. Medium to high-alloy steels were rolled. The impact force between the roll stands was reduced by 35% compared to conventional lubricants. The durability of the mandrels increased by 20%. The inner surface of the pipes was significantly smoother than when using the known lubricants. The quality check showed a reduction in

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Organic Chemistry (AREA)
• Lubricants (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7704527

Family Applications (1)

Country Status (6)

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• 2001
  • 2001-11-02 DE DE10154062A patent/DE10154062A1/de not_active Withdrawn
• 2002
  • 2002-10-04 WO PCT/DE2002/003772 patent/WO2003040274A1/fr active IP Right Grant
  • 2002-10-04 EP EP02782698A patent/EP1444314B1/fr not_active Expired - Lifetime
  • 2002-10-04 AT AT02782698T patent/ATE367426T1/de active
  • 2002-10-04 DE DE50210522T patent/DE50210522D1/de not_active Expired - Lifetime
  • 2002-10-04 ES ES02782698T patent/ES2288563T3/es not_active Expired - Lifetime
  • 2002-10-04 PL PL368159A patent/PL197304B1/pl unknown

Non-Patent Citations (1)

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