1、Designation: A1073/A1073M 14A1073/A1073M 16Standard Practice forUsing Hand Micrometers to Measure the Thickness ofUncoated Steel Sheet and Nonmetallic and Metallic-CoatedSteel Sheet1This standard is issued under the fixed designation A1073/A1073M; the number immediately following the designation ind
2、icates theyear of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice defines procedures for meas
3、uring the thickness of uncoated steel sheet and nonmetallic and metallic-coatedsteel sheet.Thickness is a significant quality characteristic of steel sheet products.The ability to accurately measure thickness usinghand micrometers is critical in determining product conformance to specifications. The
4、 methods described are designed andintended for use in both laboratory and plant situations and their environments.1.2 The flat steel product shall conform to all the requirements of the appropriate specifications as follows: SpecificationsA924/A924M and A917.1.3 Quantitative limits are not addresse
5、d and are established in the general requirements, or individual product specifications,or both; or when applicable, as agreed to between supplier and user.1.4 This specification is applicable to orders in either inch-pound units or SI units. Values in inch-pound and SI units are notnecessarily equi
6、valent. Within the text, SI units are shown in brackets. Each system shall be used independently of the other.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safet
7、y and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A902 Terminology Relating to Metallic Coated Steel ProductsA917 Specification for Steel Sheet, Coated by the Electrolytic Process for Applications Requiring Designa
8、tion of the CoatingMass on Each Surface (General Requirements)A924/A924M Specification for General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip Process3. Terminology3.1 DefinitionsSee Terminology A902 for definitions of general terminology relating to metallic-coated hot-dip products
9、.3.2 The definitions and procedures for measuring thickness characteristics of steel sheet products are provided so that purchasersand suppliers have common definitions and measuring procedures for thickness measurements. The intention of these definitionsand measuring methods is not to provide dime
10、nsional specifications for thickness characteristics, but rather common proceduresfor quantifying thickness values. For determining compliance with thickness specifications, references are provided to appropriateASTM standards.4. Apparatus4.1 Micrometers used for thickness measurement shall be const
11、ructed with anvils and spindles having minimum diameters of0.188 in. 4.80 mm. The tip of the anvil shall be flat or rounded with a minimum radius of curvature of 0.10 in. 2.55 mm andthe tip of the spindle shall be flat. Micrometers with conical tips, rounded anvil with rounded spindle, pointed tips
12、or any surface1 This practice is under the jurisdiction of ASTM Committee A05 on Metallic-Coated Iron and Steel Products and is the direct responsibility of Subcommittee A05.07on Methods of Testing.Current edition approved Jan. 1, 2014May 1, 2016. Published January 2014May 2016. Originally approved
13、in 2012. Last previous edition approved in 20122014 asA1073/A1073M- 12. DOI:10.1520/A1073_A1073M-14.-14. DOI:10.1520/A1073_A1073M-16.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume inform
14、ation, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately dep
15、ict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19
16、428-2959. United States1that may penetrate the surface of the item being measured shall not be used for thickness measurements of sheet steels.Micrometers can be electronic digital, mechanical digital, or analog with vernier scale, as shown in Fig. 1(a), (b), and (c).4.2 Unlock the micrometer and if
17、 electronic digital, turn it on.4.3 Typical ways to hold/secure the micrometer are:4.3.1 Grasp the micrometer as shown in Fig. 2, with the small finger placed in the frame of the micrometer for support. Thisallows the other hand to insert the sample for measuring after cleaning (see 4.4).4.3.2 Suppo
18、rt the micrometer with a micrometer mount. This allows the other hand to insert the sample after cleaning (see 4.4).Inserting the sample with one hand while lightly clamping with the other hand, as shown in Fig. 3.4.4 Clean the micrometer tips at regular intervals. Place cleaning material, such as c
19、lean dry paper, lint free cloth, cardboardor fabric (not abrasive such as sandpaper) in between the anvil and spindle. Tighten the micrometer until lightly snug. Pull thecleaning material until free of the micrometer. Repeat until the micrometer is clean. Usually once or twice is adequate.4.5 Close
20、the micrometer by turning the friction thimble and zero out (reset) the micrometer in accordance with manufacturersinstructions. For mechanical vernier micrometers, adjust the barrel to read zero in accordance with manufacturers instructions, andas mechanical micrometers are sensitive to barrel adju
21、stments, recalibrate in accordance with the manufacturers instructions.4.6 Measure material thickness by opening the micrometer wide enough so the sample can be placed between the anvil andspindle tip. Turn the friction thimble until there is no further movement of the spindle. Spin the friction thi
22、mble one further turnto secure the measurement. For electronic digital micrometers, read the viewing screen for the measurement. Follow themanufacturers instructions for mechanical micrometers with or without vernier micrometer scales.4.7 Repeat measurements as required. Note that the micrometer rea
23、dings are subject to the precision of the type of micrometerused.4.8 Recording Readings:4.8.1 If required on the sample, identify where the reading(s) was made using a circle, box, cross hairs, etc.4.8.2 In the measurement record of readings, use a traceable identification back to the sample or prod
24、uct that was measured.5. Calibration Checks5.1 It is common practice to calibrate micrometers on a regular basis in accordance with operational standards of each company.The micrometers must be calibrated to appropriate NIST or equivalent standards within the prescribed time limits. The maximumlengt
25、h of time recommended between calibrations is one year.5.2 Zero out the micrometer.5.3 Measure at least three (3) (different) thicknesses so that the range of typical measurement is covered. Zero may be one ofthe reference measurements. Use NIST or equivalent traceable standards (test blocks) in inc
26、rements of 0.050 in. that are withinthe thickness range of the product being measured. Example: To measure thin sheet such as 0.048 in., use zero and two standardsof 0.050000 in. 1.30 mm and 0.100000 in. 2.54 mm. Heavy thickness sheet such as 0.205 in., would use 0.200000 in 5.08 mm,0.250000 in. 6.3
27、5 mm, and 0.300000 in. 7.60 mm. If the micrometer readings of the standards (test blocks) are satisfactory, thedevice can be used to measure sheet steel with confidence.6. Proper Care of the Instrument6.1 Do not disassemble a digital micrometer.Electronic Digital Mechanical Digital Analog with Verni
28、er Scale1Anvil 2Spindle3Lock 4Thimble5Display 6Controls7Scale 8Vernier ScaleFIG. 1 Micrometer TypesA1073/A1073M 1626.2 Store the micrometer at room temperature, typically 60 to 100F 16 to 38C. When measuring, let the micrometeracclimate to the ambient temperature of the sample. It is then appropriat
29、e to set the micrometer at zero.6.3 Keep the micrometer clean and in a clean environment.6.4 Keep micrometer away from liquids of any kind.6.5 Do not subject the micrometer to sudden shocks such as from dropping, or to excessive force during measuring.6.6 Wipe off dust, cutting chips, oil, and moist
30、ure from the micrometer after each use.6.7 When cleaning the micrometer, use a soft cloth using a neutral detergent. Do not use any organic solvent (thinner, etc.) asit may cause damage to the device.6.8 Do not use an electric marking pen or other such device on the micrometer.FIG. 2 Holding a Micom
31、eterFIG. 3 Mounted MicrometerA1073/A1073M 1637. Accuracy Statement37.1 Accuracy of Electronic Digital Micrometers is 6 0.0003 in. 6 0.008 mm.7.2 Accuracy of Vernier Micrometers is 6 0.0004 in. 6 0.010 mm.7.3 The accuracy statement was determined through statistical examination of four studies from 3
32、1 laboratories on steel samplesand NIST traceable standards.NOTE 1The studies used micrometers with resolutions of 0.0001 in. 0.00254 mm or finer.8. Keywords8.1 micrometer; steel sheet; steel sheet metallic-coatedASTM International takes no position respecting the validity of any patent rights asser
33、ted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by
34、the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive
35、 careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM Interna
36、tional, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through
37、the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ Supporting data have been filed at ASTM International Headquarters and may be obtained by requesting Research Report RR:A05-1005. Contact ASTM CustomerService at serviceastm.org.A1073/A1073M 164
