EP0453565A1 - Compose lubrifiant pour le laminage a chaud de l'acier - Google Patents

Compose lubrifiant pour le laminage a chaud de l'acier Download PDF

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Publication number
EP0453565A1
EP0453565A1 EP89907268A EP89907268A EP0453565A1 EP 0453565 A1 EP0453565 A1 EP 0453565A1 EP 89907268 A EP89907268 A EP 89907268A EP 89907268 A EP89907268 A EP 89907268A EP 0453565 A1 EP0453565 A1 EP 0453565A1
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EP
European Patent Office
Prior art keywords
heat
oil
hot
lubricating composition
grease
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.)
Granted
Application number
EP89907268A
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German (de)
English (en)
Other versions
EP0453565B1 (fr
EP0453565A4 (en
Inventor
R. C/O Nippon Steel Corp. Muroran Works Kurahashi
T. C/O Nippon Steel Corp. Muroran Works Kouga
Masataka Shirata
Masayoshi Sakakibara
Hiroshi Kamiyashiki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyodo Yushi Co Ltd
Nippon Steel Corp
Original Assignee
Kyodo Yushi Co Ltd
Nippon Steel Corp
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Publication date
Priority claimed from JP1134323A external-priority patent/JPH0813980B2/ja
Application filed by Kyodo Yushi Co Ltd, Nippon Steel Corp filed Critical Kyodo Yushi Co Ltd
Publication of EP0453565A1 publication Critical patent/EP0453565A1/fr
Publication of EP0453565A4 publication Critical patent/EP0453565A4/en
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Publication of EP0453565B1 publication Critical patent/EP0453565B1/fr
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
    • C10M141/06—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic nitrogen-containing compound
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    • C10M2215/24—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions having hydrocarbon substituents containing thirty or more carbon atoms, e.g. nitrogen derivatives of substituted succinic acid
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    • C10M2219/02—Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds
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    • C10M2229/02—Unspecified siloxanes; Silicones
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    • C10M2229/04—Siloxanes with specific structure
    • C10M2229/05—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon
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    • C10N2040/24—Metal working without essential removal of material, e.g. forming, gorging, drawing, pressing, stamping, rolling or extruding; Punching metal
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    • C10N2040/241—Manufacturing joint-less pipes
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    • C10N2040/245—Soft metals, e.g. aluminum
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    • C10N2040/246—Iron or steel
    • C—CHEMISTRY; METALLURGY
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    • C10N2040/247—Stainless steel

Definitions

  • the present invention relates to a lubricating composition for hot-rolling steel. More particularly, the present invention relates to a lubricating composition by which a transfer of heat to a work roll from a material to be rolled is prevented and the effect of reducing the thermal crown of the work roll is attained by incorporating a specific heat-insulating agent into a base oil or base grease.
  • the main object of the conventional lubricant for hot rolling is to reduce wear of a work roll and improve the roll surface, because the requirement for the quality of a rolled product is relatively moderate and the thermal crown of the work roll is not regarded as important. Nevertheless, recently, an increased of the quality of the product has been demanded, and the effect of reducing the thermal crown of the work roll, which has an direct adverse influence on the quality of the product, has become important.
  • the present invention relates to a lubricant composition for hot-rolling steel, which is characterized in that a heat-insulating agent is incorporated into a base oil or base grease. More specifically, it was found that if two specific kinds of heat-insulating agents, i.e., (A) an inorganic compound which is melted by an absorption of heat at a temperature lower than 1200 C, and (B) an inorganic powder which is not melted or decomposed at a temperature lower than 1200° C and has a heat conductivity lower than 0.01 cal/cm.s.
  • A an inorganic compound which is melted by an absorption of heat at a temperature lower than 1200 C
  • B an inorganic powder which is not melted or decomposed at a temperature lower than 1200° C and has a heat conductivity lower than 0.01 cal/cm.s.
  • a lubricating composition for hot-rolling steel which comprises a base oil and a heat-insulating agent incorporated therein, wherein the above-mentioned components (A) and (B) are used as the heat-insulating agent.
  • a lubricating composition for hot-rolling steel which comprises a base grease and a heat-insulating agent incorporated therein, and the above-mentioned component (A) and/or the above-mentioned component (B) is used as the heat-insulating agent.
  • the base grease is used instead of the base oil, and the heat-insulating property is improved by the combination of the base grease with the component (A), the component (B) or the components (A) and (B). Since a grease has a low flowability at a high temperature, compared with an oil, a remarkable effect can be attained in the grease by the addition of the component (A) or (B) alone. If the components (A) and (B) are incorporated in combination, a highest effect can be attained due to the synergistic action of the two components.
  • the lubricating property of the base oil can be further improved, and the lubricating property, heat-insulating property, storage stability, working property, and water washing resistance of the base grease can be further improved.
  • Fig. 1 is a diagram illustrating the method of measuring the contact heat transfer ratio between metals.
  • the surface temperature of a work roll is elevated to about 800 C by contact with a material to be rolled.
  • Most of the conventional lubricants for hot rolling comprise a mineral oil, an oiliness agent, an extreme pressure additive, and a solid lubricating agent, in combination, and although the lubricating property is taken into consideration, an insulation of heat (prevention of transfer of heat to the work roll from the material to be rolled) is not considered.
  • Japanese Unexamined Patent Publication No. 60-6211 teaches that a roll can be protected by adding a fine powder of an inorganic compound having a melting point lower than 1200°C under atmospheric pressure, an average particle size smaller than 1 ⁇ m, and no corrosive action on iron and steel including cast iron and cast steel and other metals, and acting as a substance having a poor heat conductivity to a commercially available hot-rolling oil (liquid).
  • the base oil disclosed in this patent publication is a commercially available hot-rolling oil (liquid) and is different from the base grease used in the second embodiment of the present invention.
  • the powder used in the invention of the above-mentioned patent publication is a powder of an inorganic compound which melts at a temperature lower than 1200°C, and the heat transfer-preventing effect is drastically reduced after melting.
  • an inorganic compound melting at a temperature lower than 1200°C and an inorganic powder not melting or decomposing at a temperature lower than 1200° C are used in combination, and where a base grease as semi-fluid grease having a higher heat-insulating property than that of the liquid base oil is used, two kinds of the inorganic powders are added singly or in combination, whereby the heat-insulating property is further increased.
  • the heat-insulating agent used in the present invention includes (A) an inorganic compound which is melted by an absorption of heat at a temperature lower than 1200° C and (B) an inorganic powder which is not melted or decomposed at a temperature lower than 1200°C, is stable against oxidation and has a heat conductivity lower than 0.01 cal/cm.s. C at room temperature and a friction coefficient smaller than 0.7.
  • inorganic compound (A) which is melted by an absorption of heat at a temperature lower than 1200°C
  • solid powders of condensed phosphoric acid salts such as KPO 3 , NaP0 3 and K 4 P 2 O 7 , sodium silicate, chromic acid salts such as K 2 Cr 2 O 7 -, and halides such as NaCI, KCI, KF, KBr and KI.
  • Condensed phosphoric acid salts and sodium silicate which have no corrosive action on a rolling mill or a material to be rolled, are especially preferable.
  • the inorganic powder (B) which is not melted or decomposed at a temperature lower than 1200° C, is stable against oxidation and has a heat conductivity lower than 0.01 cal/cm.s. C at room temperature and a friction coefficient smaller than 0.7, there can be used boron nitride, silicon nitride, amorphous carbon, K 3 PO 4 , Ca 3 (PO 4 ) 2 , bentonite, Si0 2 and ZnO.
  • the friction coefficient referred to herein is determined by the pin-on-disk method (a rod having a diameter of 3 mm and a flat top end is pressed under a load of 1 kgf against a disk having a diameter of 11 mm, and the disk is slid at a speed of 0.01 m/s).
  • a heat-insulating agent having an average particle size smaller than 50 ⁇ m can be used, but in view of the clearance between the roll and the material to be rolled, preferably the average particle size of the heat-insulating agent is smaller than 10 ⁇ m.
  • the heat-insulating agent (A) is promptly melted by absorption of heat and prevents heat from being transferred to the work roll from the material to be rolled. It is known that the heat conductivity of a liquid is, in general, increased more than that of a powder. Accordingly, it is considered that the heat transfer-reducing effect of the heat-insulating agent (A) is abruptly decreased by melting.
  • the heat-insulating agent (B) since the heat-insulating agent (B) is not melted or decomposed even under high-temperature and high-pressure conditions, the heat-insulating agent (B) is present in the form of a powder in the roll bite and prevents the work roll from falling in contact with the material to be rolled, and it is considered that since the powder per se has a lubricating property, a generation of heat by friction in the roll bite is reduced by the powder of the heat-insulating agent (B).
  • the heat-insulating agent (A) has an excellent heat-insulating property
  • the heat-insulating agent (A) is melted at a high temperature
  • the heat-insulating property is drastically reduced.
  • the heat-insulating agent (B) since the heat-insulating agent (B) is not melted or decomposed at a temperature lower than 1200°C, the heat-insulating agent (B) has a heat-insulating property over a broad temperature range. Accordingly, if the heat-insulating agent (A) and the heat-insulating agent (B) are made present at a specific ratio, a lubricating agent having the excellent effects of both heat-insulating agents (A) and (B) can be obtained.
  • the heat-insulating agent is added in an amount of 5 to 50% by weight, especially 10 to 40% by weight. If the amount of the heat-insulating agent is smaller than 5% by weight, the heat-insulating effect is too low, and if the amount of the heat-insulating agent is larger than 50% by weight, the viscosity of the lubricant becomes too high and the oil-supplying property is degraded.
  • the ratio of the heat-insulating agent (A) to the heat-insulating agent (B) is in the range of 49/1 to 1/49, especially 19/1 to 1/4.
  • medium and heavy mineral oils such as spindle oil, machine oil, dynamo oil, motor oil, cylinder oil and bright stock
  • animal and vegetable oils such as beef tallow, lard, sperm oil, palm oil, coconuts oil, linseed oil, rice bran oil and soybean oil
  • synthetic oils such as esters of fatty acids having 8 to 22 carbon atoms with monohydric or polyhydric alcohols, a-olefins, polybutene, silicone oils and fluorine oils, and mixtures of these oils.
  • lithium soap grease As the base grease that can be used in the present invention, there can be mentioned lithium soap grease, calcium soap grease, sodium soap grease, aluminum soap grease, calcium complex grease, polyurea grease and organo-clay grease. Lithium soap grease, calcium complex grease, polyurea grease and organo-clay grease, which have an excellent heat resistance, are preferable.
  • inorganic solid lubricants such as graphite (natural graphite and artificial graphite), molybdenum disulfide, mica (natural mica and artificial mica), fluorinated graphite, boron nitride, soft metals (such as gold, silver and copper) and talc, and organic solid lubricants such as PTFE (polytetrafluoroethylene), MCA (melamine/cyanuric acid adduct) and phthalocyanine.
  • inorganic solid lubricants such as graphite (natural graphite and artificial graphite), molybdenum disulfide, mica (natural mica and artificial mica), fluorinated graphite, boron nitride, soft metals (such as gold, silver and copper) and talc
  • organic solid lubricants such as PTFE (polytetrafluoroethylene), MCA (melamine/cyanuric acid adduct) and phthalocyanine.
  • Graphite natural graphite and artificial graphite
  • mica natural mica and artificial mica
  • boron nitride and talc which have an excellent heat resistance and oxidation stability at a high temperature and have no substantial influence on a material to be rolled
  • the amount added of the solid lubricant is 0 to 40% by weight, especially 5 to 15% by weight. If the amount added of the solid lubricant exceeds 40% by weight, the viscosity of the lubricant becomes too high and the oil-supplying property is reduced.
  • the extreme pressure additive that can be used in the present invention there can be mentioned sulfur compounds, phosphorus compounds, chlorine compounds and organic metal compounds.
  • the amount added of the extreme pressure additive is 0 to 20% by weight, especially 0.5 to 10% by weight. If the amount added of the extreme pressure additive exceeds 20% by weight, undesired side effects such as an appearance of a corrosive action and reduction of the stability of the micell structure of the grease occur.
  • a base oil, a base grease, a heat-insulating agent, an extreme pressure additive, and a solid lubricant were mixed at a mixing ratio shown in Table 1, whereby lubricating agents of Examples 1 through 26 and Comparative Examples 1 through 5 were prepared. With respect to each of the so-obtained compositions, the performances were evaluated according to the test methods described below. The results are shown in Table 1.
  • both ends of a test piece were fixed and the test piece induction-heated gripped between rolls while supplying an oil to the test piece, and a slip lubrication effected.
  • the friction coefficient and seizure resistance of each lubricant were examined to evaluate the lubricating property.
  • Friction coefficient /1. T/R' W
  • T represents a shaft torque
  • R represents a roll radius
  • W represents a load
  • Residual oil or grease ratio (%) [(amount of residual oil or grease)/(amount coated of oil or grease)] x 100
  • reference numeral 4 represents a heat-insulating material and reference numeral 5 represents a thermocouple.
  • the lubricating composition of the present invention exerts an effect of reducing the thermal crown of a work roll, which has an influences on the quality of a product, in the field of hot rolling steel, and is especially valuable in this field.

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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)
  • Inorganic Chemistry (AREA)
  • Lubricants (AREA)

Abstract

Composé lubrifiant comprenant une huile de base ou une graisse de base et une quantité déterminée d'un agent thermo-isolant comprenant (A) un composé inorganique subissant une fusion endothermique à des températures égales ou inférieures à 1200°C et (B) une poudre inorganique qui ne fond pas ni ne se décompose à des températures égales ou inférieurs à 1200°C et qui présente une conductivité thermique égale ou inférieure à 0,01 cal/cm.s.°C et un coefficient de friction égal ou inférieur à 0,7 à température ambiante, ces substances étant ajoutées séparément ou en combinaison. Ce produit lubrifiant présente un excellent effet thermo-isolant et empêche efficacement la survenance de couronnes thermiques dans les cylindres d'usinage.
EP89907268A 1988-06-14 1989-06-13 Compose lubrifiant pour le laminage a chaud de l'acier Expired - Lifetime EP0453565B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP144588/88 1988-06-14
JP14458888 1988-06-14
JP134323/89 1989-05-26
JP1134323A JPH0813980B2 (ja) 1988-06-14 1989-05-26 鋼の熱間圧延潤滑剤組成物
PCT/JP1989/000591 WO1989012669A1 (fr) 1988-06-14 1989-06-13 Compose lubrifiant pour le laminage a chaud de l'acier

Publications (3)

Publication Number Publication Date
EP0453565A1 true EP0453565A1 (fr) 1991-10-30
EP0453565A4 EP0453565A4 (en) 1992-01-02
EP0453565B1 EP0453565B1 (fr) 1995-08-30

Family

ID=26468454

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89907268A Expired - Lifetime EP0453565B1 (fr) 1988-06-14 1989-06-13 Compose lubrifiant pour le laminage a chaud de l'acier

Country Status (4)

Country Link
EP (1) EP0453565B1 (fr)
AU (1) AU625675B2 (fr)
DE (1) DE68924075T2 (fr)
WO (1) WO1989012669A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0508115A1 (fr) * 1991-03-07 1992-10-14 Nippon Oil Co. Ltd. Composition de graisse pour joint homocinétique
US5569643A (en) * 1991-03-07 1996-10-29 Nippon Oil Co., Ltd. Grease composition for constant velocity joint

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5508321A (en) * 1994-06-15 1996-04-16 Brebner; Keith I. Intumescent silicone rubber composition
DE102006047621A1 (de) * 2006-10-09 2008-04-10 Chemische Fabrik Budenheim Kg Graphithaltiger Hochtemperaturschmierstoff für Edel- und Kohlenstoffstähle
RU2351640C2 (ru) * 2007-05-14 2009-04-10 Общество с Ограниченной Ответственностью "Научно-Производственный Центр "Конверс-Ресурс" Способ получения и состав смазочной композиции для формирования противоизносных и антифрикционных свойств приповерхностных слоев трущихся деталей

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52101363A (en) * 1977-01-27 1977-08-25 Origin Electric Coatng for lubricating
US4107058A (en) * 1977-08-19 1978-08-15 Exxon Research & Engineering Co. Pressure grease composition
JPS572368A (en) * 1980-06-07 1982-01-07 Nippon Steel Corp Material for coating hot steel surface
JPS581796A (ja) * 1981-06-25 1983-01-07 Kobe Steel Ltd 熱間圧延用潤滑剤
JPS5981394A (ja) * 1982-10-30 1984-05-11 Kobe Steel Ltd 金属のプレス加工用潤滑剤
JPS606211A (ja) * 1983-06-27 1985-01-12 Nippon Steel Corp ロ−ルの保護方法
US4612127A (en) * 1983-09-28 1986-09-16 Hitachi, Ltd. Lubricant for metal forming and process for metal forming
SU1204283A1 (ru) * 1983-11-05 1986-01-15 Предприятие П/Я М-5481 Состав дл нанесени на поверхность стальных листов перед гор чей прокаткой

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0508115A1 (fr) * 1991-03-07 1992-10-14 Nippon Oil Co. Ltd. Composition de graisse pour joint homocinétique
EP0558099A1 (fr) * 1991-03-07 1993-09-01 Nippon Oil Co. Ltd. Composition de graisse pour joint homocinetique
US5512188A (en) * 1991-03-07 1996-04-30 Nippon Oil Co., Ltd. Grease composition for constant velocity joint comprising boron nitride powder and zinc dithiophosphate
US5569643A (en) * 1991-03-07 1996-10-29 Nippon Oil Co., Ltd. Grease composition for constant velocity joint

Also Published As

Publication number Publication date
EP0453565B1 (fr) 1995-08-30
AU625675B2 (en) 1992-07-16
EP0453565A4 (en) 1992-01-02
WO1989012669A1 (fr) 1989-12-28
DE68924075T2 (de) 1996-01-25
AU3833489A (en) 1990-01-12
DE68924075D1 (de) 1995-10-05

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