1、Designation: F836M 161Standard Specification forStyle 1 Stainless Steel Metric Nuts (Metric)1This standard is issued under the fixed designation F836M; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A nu
2、mber in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1NOTETable 3 was editorially corrected in January 2018.1. Scope
3、*1.1 This specification covers the chemical and mechanicalrequirements for stainless steel metric nuts with nominal threaddiameters M1.6 through M36 and intended for use in engineer-ing applications requiring general corrosion resistance.1.2 Eight groups of stainless steel alloys are covered,includi
4、ng three austenitic (GradesA1,A2, andA4), one ferritic(Grade F1), three martensitic (Grades C1, C3, and C4), and oneprecipitation hardening (Grade P1).1.3 Seventeen property classes are covered, including nineaustenitic, one ferritic, six martensitic, and one precipitationhardening. The property cla
5、sses with the permissible alloys foreach are listed in Table 1.1.4 This specification is based in concept and content onISO 3506. The chemical and mechanical requirements speci-fied for all property classes, except as given in 1.4.1, areessentially identical with classes of the same designation inIS
6、O 3506.1.4.1 This specification includes 13 of the 16 propertyclasses covered in ISO 3506. Additionally, it includes propertyclasses A1-70, A270, A470, A180, A280, and A480 forproducts with nominal thread diameters larger than M20; andfour non-ISO property classes, C1-110, C4-110, C3-120, andP1-90.1
7、.5 Supplementary requirements of an optional nature areprovided, applicable only when agreed upon between themanufacturer and the purchaser at the time of the inquiry andorder.1.6 Suitable bolts, hex cap screws, and studs for use withnuts included in this specification are covered by SpecificationF7
8、38M. Unless otherwise specified, all bolts, hex cap screws,and studs used with these nuts shall conform to the require-ments of Specification F738M and shall be of the same alloygroup.1.7 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thiss
9、tandard.1.8 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBar
10、riers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A262 Practices for Detecting Susceptibility to IntergranularAttack in Austenitic Stainless SteelsA342/A342M Test Methods for Permeability of WeaklyMagnetic MaterialsA380 Practice for Cleaning, Descaling, and Passivation ofStai
11、nless Steel Parts, Equipment, and SystemsA493 Specification for Stainless Steel Wire and Wire Rodsfor Cold Heading and Cold ForgingA555/A555M Specification for General Requirements forStainless Steel Wire and Wire RodsA564/A564M Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless
12、Steel Bars and ShapesA582/A582M Specification for Free-Machining StainlessSteel BarsA751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel ProductsD3951 Practice for Commercial PackagingE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifi
13、cationsF606M Test Methods for Determining the Mechanical Prop-erties of Externally and Internally Threaded Fasteners,1This specification is under the jurisdiction of ASTM Committee F16 onFastenersand is the direct responsibility of Subcommittee F16.04 on NonferrousFasteners.Current edition approved
14、May 1, 2016. Published July 2016. Originally approvedin 1983. Last previous edition approved in 2015 as F836M 02(2015). DOI:10.1520/F0836M-16E01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards
15、volume information, refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was develo
16、ped in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1Washers, and Rivets
17、(Metric)F738M Specification for Stainless Steel Metric Bolts,Screws, and Studs (Withdrawn 2014)3F1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance Inspection2.2 ISO Standard:4ISO 3506 Corrosion-Resistant Stainless Steel FastenersISO 4032 Hexagon regular nuts (s
18、tyle 1)Product gradesAand B2.3 ASME Standards:ASME B1.13M Metric Screw ThreadsM Profile4ASME B18.2.4.4M Metric Hex Flange NutsNOTE 1The following ASTM standards are noted for informationonly as suitable sources of material for the manufacture of nuts to thisspecification: Specifications A493, A564/A
19、564M, and A582/A582M.3. Classification3.1 The designation of each property class is comprised ofthree parts, a letter followed by a single digit, followed byeither two or three digits (see Table 1).3.1.1 The letter indicates the general composition type ofstainless steel:3.1.1.1 A for austenitic ste
20、els,3.1.1.2 F for ferritic steels,3.1.1.3 C for martensitic steels, and3.1.1.4 P for precipitation-hardening steel.3.1.2 The first digit (1, 2, 3, or 4) indicates the alloy group.The permissible alloys within each group are given in Table 1.3.1.3 The last two or three digits (50, 70, 110, etc.) indi
21、cate10 % of the specified nut proof load stress of the property class.3.1.4 For example, Class A1-50 is an austenitic steel of anyone of six permitted alloys, and the manufactured nut has aproof load stress of 500 MPa.4. Ordering Information4.1 Orders for nuts under this specification shall include
22、thefollowing :4.1.1 Quantity (number of pieces of each item);4.1.2 Name of item (specific type and style, and referencesto dimensional standard when appropriate);4.1.3 Size (nominal diameter, thread pitch);4.1.4 Property class;4.1.5 Supplementary requirements, if any (S1 through S3).4.1.6 Orders for
23、 nuts under this specification may includethe following optional requirements:4.1.6.1 Forming (5.1);4.1.6.2 Alloy condition (5.2);4.1.6.3 Alloy selection (7.2.1 and S2);4.1.6.4 Test report (15.2);4.1.6.5 Additional testing (11.3);4.1.6.6 Corrosion resistance testing (11.2);4.1.6.7 Inspection (13.1);
24、4.1.6.8 Heat number (11.1.1);4.1.6.9 Certification (15.1);4.1.6.10 Proof load testing (9.2).4.1.7 ASTM specification and date of issue. When date ofissue is not specified, nuts shall be furnished to the latest issue.NOTE 2Example:10 000 pieces, hex nut, ISO 4032, M6 1, Class A2-70, furnish testrepor
25、t, ASTM F836M XX.15 000 pieces, Hex Flange Nuts, ASME B18.2.4.4M, M8 1.25, classA4-50, Supplementary Requirement S3, ASTM F836 XX.5. Materials and Manufacture5.1 FormingUnless otherwise specified, nuts shall becold-formed, hot-formed, or machined, at the option of themanufacturer.5.2 ConditionNuts s
26、hall be furnished in the conditionspecified for the property class in Table 2. If other conditionsare required, the condition and resultant mechanical propertiesshall be as agreed upon between the manufacturer and thepurchaser.5.3 Surface FinishUnless otherwise specified, nuts shallbe cleaned and de
27、scaled in accordance with Practice A380.6. Heat Treatment6.1 Austenitic Alloys, Grades A1, A2, and A4:6.1.1 When Condition A is specified, the nuts shall bemachined from annealed or solution annealed stock, thus3The last approved version of this historical standard is referenced onwww.astm.org.4Avai
28、lable from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.orgTABLE 1 Property Classes of Stainless Steel NutsProperty Class Permissible AlloysA1-50 304, 304L, 305AA1-70 384, 189LW, 302HQA1-80A2-50A2-70 321, 34
29、7A2-80A4-50A4-70 316, 316LA4-80F1-45 430BC1-70 410C1-110C3-80 431C3-120C4-70 416, 416SeC4-110P1-90 630AWhen approved by the purchaser, Alloys 303, 303Se, or XM1 may be furnished.BWhen approved by the purchaser, Alloy 430F may be furnished.F836M 1612retaining the properties of the original material,
30、or hot formedand solution annealed.6.1.2 When Condition AF is specified, the nuts, followingmanufacture, shall be annealed by heating to 1040 6 30C, atwhich time the chromium carbide will go into solution. Thenuts shall be held for a sufficient time and then cooled at a ratesufficient to prevent pre
31、cipitation of the carbide and to providethe properties specified in Table 2.6.1.3 When Condition CW is specified, the austenitic alloyshall be annealed as specified in 6.1.1, and then cold-worked todevelop the properties specified in Table 2.6.1.4 When Condition SH is specified, nuts shall be ma-chi
32、ned from strain hardened stock.6.2 Ferritic Alloys, Grade F1:6.2.1 When Condition A is specified, the ferritic alloy shallbe heated to a temperature of 790 6 30C, held for anappropriate time, and then air-cooled to provide the propertiesspecified in Table 2.6.2.2 When Condition AF is specified, nuts
33、 shall be treatedas specified in 6.1.2.6.3 Martensitic Alloys, Grades C1, C3, and C4:6.3.1 When Condition H is specified, the nuts shall behardened and tempered by heating to 1010 6 30C sufficientfor austenitization, holding for at least 1 h and then air-coolingto provide the properties specified in
34、 Table 2.6.3.2 When Condition HT is specified, the nuts shall behardened and tempered by heating to 1010 6 30C sufficientfor austenitization, holding for at least12 h, rapid air- oroil-quenching, reheating to 275C minimum, and holding for atleast 1 h and then air-cooling to provide the properties sp
35、ecifiedin Table 2.6.4 Precipitation-Hardening Alloy, Grade P1When Con-dition AH is specified, the nuts shall be solution-annealed andaged by heating to 1040 6 15C, holding for at least12 h, rapidair- or oil-quenching to 27C maximum, reheating to 620 610C minimum, holding for 4 h, and then air-coolin
36、g toprovide the properties specified in Table 2.7. Chemical Composition7.1 It is the intent of this specification that nuts shall beordered by property class.7.2 Unless otherwise specified in the inquiry and purchaseorder (see Supplementary Requirement S2), when two or morealloys are permitted for n
37、uts of a specified property class, thechoice of alloy to be used shall be that of the fastenermanufacturer as determined by his nut fabrication methods andmaterial availability. The specific alloy used by the manufac-turer shall be identified clearly on any certification required inthe purchase orde
38、r and shall have a chemical compositionconforming to the limits specified in Table 3.TABLE 2 Mechanical Property RequirementsProperty Class ConditionAAlloy/MechanicalProperty MarkingNominal ThreadDiameterProof LoadStress, MPaHardnessVickers Rockwellmin max min maxA1-50 F836AA2-50 A or AF F836B M1.6
39、to M36 500 155 220 B81 B95A4-50 F836CA1-70 F836D M1.6 to M20 700 220 330 B96 C33A2-70 CW F836E over M20 to M36 550 160 310 B83 C31A4-70 F836FA1-80 F836G M1.6 to M20 800 240 350 C23 C36A2-80 SH F836H over M20 to M24 700 220 330 B96 C33A4-80 F836J over M24 to M30 650 200 310 B93 C30over M30 to M36 600
40、 180 285 B89 C28F1-45 A or AF F836K M1.6 to M36 450 135 220 B74 B96C1-70HF836LM1.6 to M36 700 220 330 B96 C34C4-70 F836MC1-110C4-110HTF836NF836P M1.6 to M361100 350 440 C36 C45C3-80 H F836R M1.6 to M36 800 240 340 C23 C35C3-120 HT F836S M1.6 to M36 1200 380 480 C39 C48P1-90 AH F836T M1.6 to M36 900
41、285 370 C28 C38ALegend of Conditions:AFformed and annealed.CWformed from annealed stock, thus acquiring a degree of cold work.SHmachined from strain hardened stock.Amachined from annealed or solution annealed stock, thus retaining the properties of the original material, or hot formed and solution a
42、nnealed.Hhardened and tempered at 565C medium.HThardened and tempered at 275C minimum.AHsolution annealed and age hardened after forming.F836M 16137.2.1 When the purchaser specifies that a specific alloy beused, the alloy shall have a chemical composition conformingto the limits specified in Table 3
43、.7.3 Product analysis may be made by the purchaser fromnuts representing each lot. The chemical composition thusdetermined shall conform to the limits specified in Table 3 forthe specific alloy within the product analysis tolerances speci-fied in Specification A555/A555M.7.3.1 In the event of discre
44、pancy, a referee analysis ofsamples for each lot shall be made in accordance with 12.1.8. Corrosion Resistance8.1 Carbide Precipitation:8.1.1 Rod, bar, and wire in the austenitic Alloy Groups A1,A2, and A4, except the free-machining grades, 303 and 303Se,used to make nuts in accordance with this spe
45、cification, shallbe capable of passing the test for susceptibility to intergranularcorrosion as specified in Practice E of Practices A262.8.1.2 As stated in Practices A262, samples may be subjectedto the faster and more severe screening test in accordance withPractice A. Failing Practice A, specimen
46、s may be tested inaccordance with Practice E and be considered satisfactory ifpassing Practice E.9. Mechanical Properties9.1 The hardness of nuts of each class shall not exceed themaximum hardness specified for the class in Table 2. This shallbe the only hardness requirement for nuts that are proof
47、loadtested.9.2 Unless proof load testing is specified in the inquiry andpurchase order, nuts of all classes in nominal thread diametersM4 and smaller, and nuts of all classes with proof loads greaterthan 530 kN, as specified in Table 4, shall be furnished on thebasis of having a hardness not less th
48、an the minimum hardnessspecified in Table 2.TABLE 3 Chemical RequirementsAlloyGroupAlloyUNSDesig-nationComposition, % maximum except as shownCar-bonManga-nesePhospho-rusSulfur Silicon Chromium Nickel CopperMolyb-denumOthersAustenitic AlloysA1 303 S30300 0.15 2.00 0.20 0.15 min 1.00 17.0 to 19.0 8.0
49、to 10.0 0.60 maxAA1 303Se S30323 0.15 2.00 0.20 0.060 1.00 17.0 to 19.0 8.0 to 10.0 Se 0.15 minA1 304 S30400 0.08 2.00 0.045 0.030 1.00 18.0 to 20.0 8.0 to 10.5 1.00A1 304L S30403 0.03 2.00 0.045 0.030 1.00 18.0 to 20.0 8.0 to 12.0 1.00A1 305 S30500 0.12 2.00 0.045 0.030 1.00 17.0 to 19.0 10.5 to 13.0 1.00A1 384 S38400 0.08 2.00 0.045 0.030 1.00 15.0 to 17.0 17.0 to 19.0A1 XM1 S20300 0.08 5.0 to 6.5 0.040 0.18 to0.351.00 16.0 to 18.0 5.0 to 6.5 1.75 to2.250.50 maxAA1 189LW S30430 0.10 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.0 3.
