2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、© ISO 2018Mechanical properties of fasteners made of carbon steel and alloy steel —Part 3: Flat washers with specified property classesCaractéristiques mécaniques des fixations en acier au carbone et en

2、 acier allié —Partie 3: Rondelles de forme plane de classes de qualité spécifiéesINTERNATIONAL STANDARDISO 898-3First edition 2018-05Reference number ISO 898-3:2018(E)ISO 898-3:2018(E)Foreword .....

3、............................................................................................................................................................................................................................

4、.......ivIntroduction .....................................................................................................................................................................................................

5、.............................v1 Scope .....................................................................................................................................................................................

6、............................................12 Normative references .......................................................................................................................................................

7、...............................13 Terms and definitions ...................................................................................................................................................................

8、..................24 Symbols ..............................................................................................................................................................................................

9、............................25 Designation system for property classes of washers and combination with property classes of bolts, screws, studs and nuts .................................................................

10、.......................................................................26 Materials .......................................................................................................................................

11、................................................................................37 Mechanical and physical properties .....................................................................................................

12、...........................................48 Test methods ...............................................................................................................................................................

13、..............................................58.1 Hardness test ..........................................................................................................................................................

14、.................................. 5 8.1.1 General.........................................................................................................................................................................

15、............. 58.1.2 Hardness test on the washer bearing surface.........................................................................................68.1.3 Hardness determined on a transverse radial section through

16、 the washer ...................98.2 Decarburization test .................................................................................................................................................................

17、.......108.2.1 General...................................................................................................................................................................................108.2.2 Microscop

18、ic method ...................................................................................................................................................108.2.3 Hardness method .....................................

19、....................................................................................................................118.3 Carburization test .............................................................................

20、.................................................................................................128.3.1 General...........................................................................................................

21、........................................................................128.3.2 Test procedure ............................................................................................................................

22、....................................128.3.3 Requirements ..................................................................................................................................................................

23、128.4 Retempering test ................................................................................................................................................................................12 8.4.1 General...

24、................................................................................................................................................................................128.4.2 Test procedure ....................

25、............................................................................................................................................128.4.3 Requirements ..........................................................

26、........................................................................................................129 Marking .......................................................................................................

27、................................................................................................................13 9.1 General ............................................................................................

28、............................................................................................................139.2 Marking of washers .....................................................................................

29、.....................................................................................139.3 Marking of packages ...........................................................................................................

30、.............................................................13Annex A (normative) Ductility test for washers of property class 380HV .................................................................14Bibliography ......

31、.......................................................................................................................................................................................................................17

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