1、DEUTSCHE NORM51825Translation by DIN-Sprachendienst.In case of doubt, the German-language original should be consulted as the authoritative text. No part of this translation may be reproduced without the prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Ber
2、lin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).June 2004Type K lubricating greasesClassication, requirements and testingDocument comprises 7 pages.ICS 75.100Schmierstoffe Schmierfette K Einteilung und AnforderungenIn keeping with current practice in standards publishe
3、d by the International Organization for Standardiza-tion (ISO), a comma has been used throughout as the decimal marker.ContentsPageForeword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Scope . . . . . . . . . . . . . . . . . . . . . . .
4、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Concept. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Classication . . .
5、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.1 Type KP lubricating grease . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.2 Type KF lubricating grease . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.
6、3 Type KPF lubricating grease . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.4 Type K synthetic lubricating grease . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Designation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7、. . . . . 36 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4ForewordThis standard has been prepared by Technical Committee Anforderungen an Schmierfette of the Fach-ausschuss Minerall- und Brennstoffnormung of the Normenausschuss Materialp
8、rfung (Materials Testing Standards Committee).When using this standard, the following should be noted.a) The aim has been to include in this standard those properties which will enable the user to make a proper choice among type K lubricating greases for the given application.b) Type K lubricating g
9、reases are to be selected as a function of the type, design and size of rolling bear-ing, and of the service conditions.c) The assessment of whether a lubricating grease is suitable for use in heavily loaded rolling bearings is rather difcult, since compliance of such grease with the minimum require
10、ments when tested as speci-ed in table 4 of DIN 51350-5 does not necessarily guarantee its suitability for such applications. Numer-ous tests have shown that test results obtained when using test models cannot entirely be assumed to apply for rolling bearings under actual service conditions.d) When
11、using lubricating greases containing solid additives, due consideration shall be given to the tribochemical or tribophysical behaviour of the rubbing surfaces.e) Information on the application of lubricating greases is provided in GfT-Arbeitsblatt 3 (Gft Code of practice) *).English price group 7 ww
12、w.din.de www.beuth.de08.05 9643519Supersedes August 1990 edition.!,cF6“964351*) Issued by the Gesellschaft fr Tribologie e.V. (German Society for Tribology), Ernststr. 15, 47443 Moers, Germany.Page 2 DIN 51825:2004-06AmendmentsThis standard differs from the August 1990 edition, as follows:a) NLGI gr
13、ade 0 has been deleted.b) Reference is made to a method specied in IP 186/93 (low-temperature torque) and a method of deter-mining the biodegradability as in DIN 51828-2.c) A reference to ISO 11007 has been included in addition to that made to DIN 51802.d) Requirements for the oxidation stability as
14、 in DIN 51808 and compatibility with standard reference elas-tomer (SRE) and acrylonitrile-butadien rubber (NBR) as in DIN 53521 and DIN 53538-1 are no longer in-cluded.e) The method specied in DIN 51820-1 has been substituted for that specied in DIN 51814.f) The standard has been editorially revise
15、d and references have been updated.Previous editionsDIN 51825: 1960-11, 1965-4, 1990-08; DIN 51825-1: 1975-01, 1981-06; DIN 51825-2: 1979-12; DIN 51825-3: 1981-06.1 ScopeThis standard species requirements and methods of test for type K lubricating greases of NLGI grades 1 to 4 (see DIN 51818) for us
16、e in rolling bearings and plain bearings and on slideways, establishes a system of desig-nating such lubricants and provides information on their application.2 Normative referencesThis standard incorporates, by dated or undated reference, provisions from other publications. These norma-tive referenc
17、es are cited at the appropriate places in the text, and the titles of the publications are listed be-low. For dated references, subsequent amendments to or revisions of any of these publications apply to this standard only when incorporated in it by amendment or revision. For undated references, the
18、 latest edition of the publication referred to applies.DIN 51350-5 Determination of wear characteristics of consistent lubricants by the Shell four-ball testerDIN 51502 Designation of lubricants and marking of lubricant containers, lubricating equipment and lubrication pointsDIN 51562-1 Viscometry D
19、etermination of kinematic viscosity using the Ubbelohde viscometer Apparatus and measurement procedureDIN 51777-2 Testing of mineral oil hydrocarbons and solvents Determination of water content according to Karl Fischer Indirect methodDIN 51802 Testing lubricating greases for their corrosion-inhibit
20、ing properties by the SKF Emcor methodDIN 51805 Determination of ow pressure of lubricating greases (Kersternich method)DIN 51807-1 Determination of the behaviour of lubricating greases in the presence of water (static method)DIN 51811 Testing the corrosive effects of lubricating greases on copper b
21、y the copper strip testDIN 51813 Determination of the solid matter content of lubricating greases (particle sizes above 25 m)DIN 51817 Determination of oil separation from lubricating grease under static conditionsDIN 51818 Consistency classication of lubricating greases NLGI gradesDIN 51820-1 Analy
22、sis of lubricating greases by infrared spectrometry Evaluation of infrared spectraDIN 51821-1 Testing lubricating grease using the FAG-FE 9 roller bearing wear testing machine Princi-plesDIN 51821-2 Testing lubricating grease using the FE 9 type FAG roller bearing wear testing machine Method A/1500/
23、6000DIN 51828-1 Determining the biodegradability of lubricants and related products General DIN 51828-2 Determining the biodegradability of lubricants and related products by infrared spectrom-etryDIN EN ISO 4259 Petroleum products Determination and application of precision data in relation to meth-
24、ods of test (ISO 4259:1992 + Cor 1:1993)ISO 2137:1985 Petroleum products Lubricating grease and petrolatum Determination of cone penetra-tionPage 3 DIN 51825:2004-06ISO 2176:1995 Petroleum products Lubricating grease Determination of dropping pointISO 3733:1999 Petroleum products and bituminous mate
25、rials Determination of water Distillation meth-odISO 11007:1997 Petroleum products and lubricants Determination of rust-prevention characteristics of lubricating greasesGfT-Arbeitsblatt 3 Wlzlagerschmierung (Lubrication of rolling bearings) *)IP 186/93 Low-temperature torque of lubricating grease *)
26、3 ConceptType K lubricating greaseLubricant intended for use in rolling bearings and plain bearings and on slideways and consisting of a mixture of mineral or synthetic oil and a thickener. It may also contain liquid or solid additives.4 ClassicationType K lubricating greases are classied as follows
27、.4.1 Type KP lubricating greaseLubricating grease containing anti-friction and anti-wear additives for mixed-friction range operation or to in-crease the load-carrying capacity, and meeting the requirements specied in DIN 51350-5 (see table 4) is des-ignated type KP lubricating grease. Such greases
28、are used, for example, in rolling bearings whose equivalent load 1), P, exceeds the dynamic load rating, C, by 10 %.4.2 Type KF lubricating greaseLubricating grease containing solid additives is designated type KF lubricating grease.4.3 Type KPF lubricating greaseLubricating grease containing anti-f
29、riction and anti-wear additives and solid additives is designated type KPF lubricating grease.4.4 Type K synthetic lubricating greaseTo designate a synthetic lubricating grease, the relevant symbol given in table 1 of DIN 51502 shall be added.5 DesignationLubricating grease shall be designated as sh
30、own in the following examples.EXAMPLE 1:Designation of a type K lubricating grease of NLGI grade 1 (see table 1), intended for use at a maximum temperature of 100 C (K; see table 2) and a lower operating temperature of 20 C (20; see table 3), con-forming to this standard:Lubricating grease DIN 51825
31、 K 1 G 20EXAMPLE 2:Designation of a type K lubricating grease of NLGI grade 2 (see table 1), intended for use at a maximum temperature of 120 C as in table 2 (K), and a lower operating temperature of 30 C, to be tested in accord-ance with method IP 186/93 (30 L; see table 3), conforming to this stan
32、dard:Lubricating grease DIN 51825 K 2 K 30 LSee page 1 for *).*) Issued by the Institute of Petroleum; obtainable from Beuth Verlag GmbH, AuslandsNormen-Service (ANS), 10772 Berlin, Germany.1) Due consideration should be given to the information provided by the rolling bearing manufacturer.Page 4 DI
33、N 51825:2004-066 RequirementsType K lubricating greases shall comply with the requirements specied in table 4. They shall be homogene-ous, largely free of air and resistant to worked penetration. When supplied in packaging drums and stored under normal conditions, they shall exhibit no signicant ble
34、eding.Assessment whether a lubricating grease complies with the specications of this standard is to be based on DIN EN ISO 4259, except for the worked penetration as in ISO 2137 and the minimum operating temperature as in IP 186/93.Table 1: NLGI grades for lubricating greasesNLGI grade (as in DIN 51
35、818)Worked penetration measured as in ISO 2137, expressed in 0,1 mm units1 310 to 3402 265 to 2953 220 to 2504 175 to 205Table 2: Code letters denoting the maximum operating temperature and the behaviour of lubricating greases in the presence of waterCode letter as in DIN 51502Maximum operating temp
36、erature, in C (see table 4)Behaviour in the presence of waterRating*) as in DIN 51807-1C+600-40 or 1-40D 2-40 or 3-40E+800-40 or 1-40F 2-40 or 3-40G+1000-90 or 1-90H 2-90 or 3-90K+1200-90 or 1-90M 2-90 or 3-90N +140 To be agreedP +160 To be agreedR +180 To be agreedS +200 To be agreedT +220 To be ag
37、reedU Above +240 To be agreed*) As the rst digit0 denotes no change1 denotes a minor change2 denotes a moderate change3 denotes a major changePage 5 DIN 51825:2004-06Table 3: Symbols denoting the minimum operating temperature of lubricating greasesSymbol (as in DIN 51502 *)Minimum operating temperat
38、ure, in C10 1020 2030 3040 4050 5060 60*) When tested in accordance with IP 186/93, the code letter L is to be added to the symbol (see example 2 in clause 5).Page6DIN51825:2004-06Table 4: Requirements and testingPropertyRequirementsTesting as inC D E F G H K M N P R S T UBehaviour in the presence o
39、f waterTo be agreed. DIN 51807-1Rating as in DIN 51807-1 040 240 040 240 090 290 090 290140 340 140 340 190 390 190 390Maximum operating tempera-ture, in C60 60 80 80 100 100 120 120 140 160 180 200 220 240Dropping point, in C 90 90 110 110 130 130 ISO 2176Testing on FE 9 type FAG rol-ler bearing gr
40、ease testing ma-chine, Method A/1500/6000 F50for 100 h at test tempera-ture, in CNo requirement 120 120 140 160 180 200 220To be agreedDIN 51821-1 and DIN 51821-2Minimum operating tempera-ture 1), in C60 50 40 30 20 10Flow pressure, in hPa Up to 1 400 DIN 51805Low-temperature torqueIP 186/93Starting
41、 torque, in mNm Up to 1 000Running torque, in mNm Up to 100Rust-prevention characteris-tics (SKF-Emcor method)Degree of corrosionUp to 1 To be agreed with the supplier. ISO 11007 or 51802 Corrosive effect on copperDegree of corrosionUp to 2 at 60 C Up to 2 at 80 C Up to 2 at 100 C To be agreed with
42、the supplier. DIN 51811Solid foreign matter content (particle size above 25 m), in mg/kgUp to 20 DIN 51813 2)Water content, as a percent-age by massUp to 3,0 Up to 0,4ISO 3733 DIN 51777-2 3)Bleeding, as a percentage by massAs declared by the supplier. DIN 51817Thickener Type and quantity as declared
43、 by the supplier. DIN 51820-1Base oil Type and viscosity at 40 C and 100 C as declared by the supplier. DIN 51562-1Page7DIN51825:2004-06PropertyRequirementsTesting as inC D E F G H K M N P R S T UBiodegradability, as a percent-age by mass80 or higher 4)DIN 51828-1 and DIN 51828-2Solid additives Type
44、 and quantity as declared by the supplier.Test method optional, and to be indicated.Wear characteristics, in mm Cap diameter: up to 1,8 mmDIN 51350-5, method E 5)1) Testing may be carried out in accordance with either IP 186/93 or DIN 51805, with the method used to be specied.2) Applies to lubricating greases not containing any solid additive.3) Testing may be carried out in accordance with either ISO 3733 or DIN 51777-2, with the method used to be specied.4) Applies only to biodegradable greases.5) Applies to type KP lubricating greases.Table 4 (concluded)
