1、Designation: F2882M 12Standard Specification forScrews, Alloy Steel, Heat Treated, 1170 MPa MinimumTensile Strength Metric1This standard is issued under the fixed designation F2882M; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers the requirements for quenchedand tempered alloy steel screws 1.6 mm through 48 m
3、m indiameter having a minimum ultimate tensile strength of 1170MPa.NOTE 1This specification is the metric companion of SpecificationF2882.1.2 The following hazard caveat pertains only to the testmethod portion, Section 10, of this specification: This standarddoes not purport to address all of the sa
4、fety concerns, if any,associated with its use. It is the responsibility of the user of thisstandard to establish appropriate safety and health practicesand determine the applicability of regulatory limitations priorto use.2. Referenced Documents2.1 ASTM Standards:2A751 Test Methods, Practices, and T
5、erminology for Chemi-cal Analysis of Steel ProductsE112 Test Methods for Determining Average Grain SizeF606M Test Methods for Determining the Mechanical Prop-erties of Externally and Internally Threaded Fasteners,Washers, and Rivets (Metric)F788/F788M Specification for Surface Discontinuities ofBolt
6、s, Screws, and Studs, Inch and Metric SeriesF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance InspectionF1940 Test Method for Process Control Verification toPrevent Hydrogen Embrittlement in Plated or CoatedFastenersF2282 Specification for QualityAssurance Req
7、uirements forCarbon and Alloy Steel Wire, Rods, and Bars for Me-chanical FastenersF2328M Test Method for Determining Decarburization andCarburization in Hardened and Tempered Threaded SteelBolts, Screws and Studs (Metric)2.2 ASME Standards:3B18.2.3.3M Metric Heavy Hex ScrewsB18.2.3.4M Metric Hex Fla
8、nge ScrewsB18.2.3.5M Metric Hex BoltsB18.2.3.6M Metric Heavy Hex BoltsB18.2.3.9M Metric Heavy Hex Flange ScrewsB18.2.7.1M Metric 12-Spline Flange ScrewsB18.3.1M Metric Socket Head Cap ScrewsB18.3.6M Metric Series Socket Set ScrewsB18.24 Part Identifying Number (PIN) Code System Stan-dard for B18 Fas
9、tener Products3. Ordering Information3.1 Orders for high strength screws under this specificationshall include the following information:3.1.1 Quantity (number of screws),3.1.2 Dimensions, including nominal diameter, threaddesignation, thread, pitch, and nominal screw length(millimeters),3.1.3 Name
10、of the screw including specification:3.1.3.1 B18.2.3.3M Metric Heavy Hex Screw,3.1.3.2 B18.2.3.4M Metric Hex Flange Screw,3.1.3.3 B18.2.3.5M Metric Hex Bolts,3.1.3.4 B18.2.3.6M Metric Heavy Hex Bolts,3.1.3.5 B18.2.3.9M Metric Heavy Hex Flange Screws,3.1.3.6 B18.2.5M Metric 12 Point Flange Screws,3.1
11、.3.7 B18.2.7.1M Metric 12-Spline Flange Screws,3.1.3.8 B18.3.1M Metric Socket Head Cap Screws,3.1.3.9 B18.24 Part Identifying Number (PIN) Code SystemStandard for B18 Fastener Products,3.1.4 ASTM designation and year of issue.3.2 Orders for high strength screws may include the follow-ing optional re
12、quirements:3.2.1 Inspection at point of manufacture.3.2.2 Coating, if required (see 4.6).3.2.3 Additional Testing ( see 11.1).1This test method is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.02 on Steel Bolts,Nuts, Rivets and Washers.
13、Current edition approved Oct. 1, 2012. Published November 2012. DOI:10.1520/F2882M-12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary
14、 page onthe ASTM website.3Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave., New York, NY 10016-5990.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesNOTICE: This standard ha
15、s either been superseded and replaced by a new version or withdrawn.Contact ASTM International (www.astm.org) for the latest information13.2.4 Special Packaging (see 14.1.2).3.2.5 Supplementary Requirement (see S1).3.2.6 Special Requirements.3.2.7 For establishment of a part identifying system, seeA
16、SME B18.24.4. Materials and Manufacture4.1 The screws shall be fabricated from steel made to finegrain practice and shall have an austenitic grain size of 5 orfiner. In the event of controversy over grain size, referee testson finished screws conducted in accordance with Test MethodsE112 shall preva
17、il.4.2 All socket set screws with diameters through M3.5 andany diameter with a length that achieves less than seven threadpitches may be rolled, cut, or ground. Set screws of M4 andlarger diameter and with more than seven thread pitches inlength shall have rolled threads.4.3 High strength screws sh
18、all be heat treated by quenchingin oil from above the transformation temperature and thentempered by reheating to at least 425C to within the hardnessrange specified in Table 1.4.3.1 The minimum tempering temperature may be verifiedby submitting screws to 415C for 30 min at temperature. Themean cros
19、s section hardness of three readings on the screwbefore and after retempering shall not differ by more than 20DPH.4.4 Re-heat-treatment of screws for the purpose of carbonrestoration is not permitted except for set screws.4.5 Standard FinishesUnless otherwise specified, thescrews shall be furnished
20、with one of the following “standardsurfaces as manufactured,” at the option of the manufacturer;(1) bright uncoated, (2) thermal black oxide, or (3) chemicalblack oxide. Hydrogen embrittlement tests shall not be re-quired for screws furnished in these conditions.4.6 Protective Coatings:4.6.1 When a
21、protective finish other than as specified in 4.5is required, it shall be specified on the purchase order with theapplicable finish specification.4.6.2 When protective or decorative coatings are applied tothe screws, precautions specified by the coating requirementsto minimize internal hydrogen embri
22、ttlement shall be exer-cised. When specified in the purchase order, testing shall beconducted in accordance with Test Methods F606M or F1940.5. Chemical Composition5.1 The screws shall be alloy steel conforming to thechemical composition specified in Table 2 and the require-ments of Specification F2
23、282. See Supplementary Require-ment S1 when additional alloy steel grades are required.5.2 One or more of the following alloying elements:chromium, nickel, molybdenum, or vanadium shall be presentin the steel in sufficient quantity to ensure the specified strengthproperties are met after oil quenchi
24、ng and tempering. As aguide for selecting material, an alloy steel should be capable ofmeeting the specified mechanical requirements if the “as oilquenched” core hardness one diameter from the point is equalto or exceeds 25 HRC + (55 carbon content).5.3 When product analyses are made by the purchase
25、r fromfinished screws representing each lot, the chemical composi-tion shall conform to the requirements for product analysis inTable 2.5.4 Steel to which bismuth, selenium, tellurium, or lead hasbeen intentionally added shall not be permitted for cold headedproducts.5.5 Chemical analyses shall be p
26、erformed in accordancewith Test Methods, Practices, and Terminology A751.6. Mechanical Properties6.1 Screws shall meet the mechanical requirements in Table1 and Table 3.6.2 The screws that are tested for wedge tensile strengthshall utilize a wedge of the angle specified in Table 4 under thehead.To m
27、eet the requirements of the wedge test, there must bea tensile failure in the body or thread section. For the purposeof this test, failure means separation into two pieces. Screwsthreaded to the head shall pass the requirements for this test ifthe fracture that caused failure originated in the threa
28、d area,even though it may have propagated into the fillet area or thehead before separation.6.3 The hardness limits shall be met anywhere on the crosssection through the threads, one diameter from the screw pointas determined using Test Methods F606M.7. Dimensions7.1 Unless otherwise specified, the
29、product shall conform tothe requirements of the dimensional specification detailed inthe purchase order.8. Workmanship, Finish, and Appearance8.1 There shall be no evidence of carburization or grossdecarburization on the surfaces of the heat-treated screws whenmeasured in accordance with F2328M (Cla
30、ss 4 Product).TABLE 1 Mechanical RequirementsProperty Class 11.9Full-size screws:Tensile or wedge strength, min, MPa 1170Proof load (stress), min, MPa 930Machined test specimen:Yield strength at 0.2 % offset, min, MPa 1055Tensile strength, min, MPa 1170Elongation in 5D, min, % 10Reduction of area, m
31、in, % 35Product hardness:Rockwell 37 to 42 HRCVickers 372 to 434 DPHTABLE 2 Chemical RequirementsElementComposition, %Heat Analysis Product AnalysisCarbon 0.33 to 0.48 0.31 to 0.50Manganese, max 1.25 1.25Phosphorus, max 0.035 0.040Sulfur, max 0.040 0.045Alloying elements See 5.2F2882M 1228.2 The sur
32、face discontinuities for these products shallconform to Specification F788/F788M.9. Sampling and Number of Tests9.1 Practice F1470 shall be used to determine the necessarysampling plan and the number of tests that must be performedto demonstrate that all of the requirements of this standard aremet f
33、or each lot. In the event that hardness reductions occur intest specimens due to coating curing times and temperatures,testing shall be conducted alternatively in accordance with TestMethod F1624.10. Test Methods10.1 Conduct tests for proof load, wedge tensile, andultimate tensile strength in accord
34、ance with Test MethodsF606M.10.2 Decarburization and carburization tests shall be con-ducted in accordance with Test Method F2328M.10.3 Surface discontinuities including thread lap inspectionshall be conducted in accordance with Standard F788/F788M.11. Inspection11.1 If the additional tests describe
35、d in 11.2 are required bythe purchaser, it shall be specified in the inquiry, order, orcontract.11.2 The inspector representing the purchaser, upon reason-able notice, shall have free entry to all parts of the manufac-turers works that concern the manufacture of the materialordered. The manufacturer
36、 shall afford the inspector all rea-sonable facilities to satisfy him that the material is beingfurnished in accordance with this specification. All tests andinspection required by the specification that are requested bythe purchasers representative shall be made before shipment,and shall be so cond
37、ucted as not to interfere unnecessarily withthe operation of the works.12. Product Marking12.1 All screws with nominal diameters of 5 mm and largershall be permanently marked to identify the property class,11.9 and the manufacturers or private label distributorsidentification symbol.12.2 Property cl
38、ass and manufacturers or private labeldistributors identification shall be separate and distinct. Marksshall preferably be in different locations and, when on the samelevel, shall be separated by a distinctive mark such as a forwardor backward slash, colon, dash, dot, or space.13. Responsibility13.1
39、 The party responsible for the fastener shall be theorganization that supplies the fastener to the purchaser.14. Packaging and Package Marking14.1 Packaging:14.1.1 Unless otherwise specified, product shall be pack-aged according to the manufacturers practice to preventdamage before and during shipme
40、nt.14.1.2 When special packaging requirements are required,they shall be defined at the time of the inquiry and order.14.2 Package Marking:14.2.1 Unless otherwise agreed upon between the purchaserand manufacturer, the container shall be marked to permitidentification of the lot. Each shipping unit s
41、hall also include orbe plainly marked with the following information:14.2.1.1 ASTM designation,14.2.1.2 Size,14.2.1.3 Name and brand or trademark of the manufacturer,14.2.1.4 Number of pieces,14.2.1.5 Purchase order number, and14.2.1.6 Country of origin.15. Keywords15.1 alloy steel; bolts; screwsTAB
42、LE 3 Minimum Ultimate Tensile LoadsNOTE 1All values are rounded to 3 significant digits.ThreadSizeStress Area,mm2Tensile Load,min, kNProof Load,kNM1.6 0.35 1.27 1.46 1.19M2 0.4 2.07 2.39 1.94M2.5 0.45 3.39 3.91 3.09M3 0.5 5.03 5.80 4.71M4 0.7 8.78 10.1 8.22M5 0.8 14.2 16.3 13.3M6 1 20.1 23.1 18.8M8
43、1.25 36.6 42.1 34.2M10 1.5 58.0 66.9 54.3M12 1.75 84.3 97 78.9M14 2 115 132 108M16 2 157 181 147M20 2.5 245 282 230M24 3 353 407 330M30 3.5 561 646 525M36 4 817 942 764M42 4.5 1120 1290 1050M48 5 1470 1690 1380TABLE 4 Wedge Test AngleProduct Diameter, mm DegreeScrews threaded 2D and through 20 6clos
44、er to underside of head over 20 to 36 4All other screws through 12 10over 12 to 16 8over 16 to 36 6F2882M 123SUPPLEMENTARY REQUIREMENTSThe following Supplementary Requirement shall apply only when specified by the purchaser in thecontract or purchase order. Supplementary requirements shall in no way
45、 negate any requirement of thespecification itself.S1. Specific Grade Chemical CompositionsS1.1 When Supplementary Requirement S1 is specified onthe order, the chemical composition shall conform to one of thecompositions in Table S1.1 at the option of the supplier, unlessa specific composition (Grad
46、e) has been specified on thepurchase order.F2882M 124ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent ri
47、ghts, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either fo
48、r revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearin
49、g you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 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 the ASTM website(www.astm.org). Permission rights to photocopy the standa
