1、Designation: F836M 16Standard 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 num
2、ber 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.1. Scope*1.1 This specification covers the chemical and mechanic
3、alrequirements 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,including three austenitic (GradesA1,A2, andA4), one ferritic(G
4、rade 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 classes with the permissible alloys foreach are listed in T
5、able 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 inISO 3506.1.4.1 This specification includes 13 of the 16 pr
6、opertyclasses 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, andP1-90.1.5 Supplementary requirements of an optional nature arep
7、rovided, 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 SpecificationF738M. Unless otherwise specified, all bolts, hex cap scre
8、ws,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 thisstandard.2. Referenced Documents2.1 ASTM Standards:2A262
9、Practices for Detecting Susceptibility to IntergranularAttack in Austenitic Stainless SteelsA342/A342M Test Methods for Permeability of WeaklyMagnetic MaterialsA380 Practice for Cleaning, Descaling, and Passivation ofStainless Steel Parts, Equipment, and SystemsA493 Specification for Stainless Steel
10、 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 Steel Bars and ShapesA582/A582M Specification for Free-Machining StainlessSteel
11、 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 SpecificationsF606M Test Methods for Determining the Mechanical Prop-erties of Externa
12、lly and Internally Threaded Fasteners,Washers, and Rivets (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
13、 Stainless Steel Fasteners1This specification is under the jurisdiction of ASTM Committee F16 onFastenersand is the direct responsibility of Subcommittee F16.04 on NonferrousFasteners.Current edition approved May 1, 2016. Published July 2016. Originally approvedin 1983. Last previous edition approve
14、d in 2015 as F836M 02(2015). DOI:10.1520/F0836M-16.2For 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 page onthe ASTM website.3The last
15、approved version of this historical standard is referenced onwww.astm.org.4Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.org*A Summary of Changes section appears at the end of this standardCopy
16、right ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1ISO 4032 Hexagon regular nuts (style 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 standar
17、ds are noted for informationonly as suitable sources of material for the manufacture of nuts to thisspecification: Specifications A493, A564/A564M, and A582/A582M.3. Classification3.1 The designation of each property class is comprised ofthree parts, a letter followed by a single digit, followed bye
18、ither 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 steels,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) indic
19、ates 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.) indicate10 % 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,
20、 and the manufactured nut has aproof load stress of 500 MPa.4. Ordering Information4.1 Orders for nuts under this specification shall include 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 appropria
21、te);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 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
22、.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);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 n
23、ot specified, nuts shall be furnished to the latest issue.NOTE 2Example:10 000 pieces, hex nut, ISO 4032, M6 1, Class A2-70, furnish testreport, 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 Manufacture
24、5.1 FormingUnless otherwise specified, nuts shall becold-formed, hot-formed, or machined, at the option of themanufacturer.5.2 ConditionNuts shall be furnished in the conditionspecified for the property class in Table 2. If other conditionsare required, the condition and resultant mechanical propert
25、iesshall be as agreed upon between the manufacturer and thepurchaser.5.3 Surface FinishUnless otherwise specified, nuts shallbe cleaned and descaled 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 bema
26、chined from annealed or solution annealed stock, thusretaining the properties of the original material, 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
27、solution. Thenuts shall be held for a sufficient time and then cooled at a ratesufficient to prevent precipitation 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
28、todevelop the properties specified in Table 2.6.1.4 When Condition SH is specified, nuts shall be ma-chined from strain hardened stock.TABLE 1 Property Classes of Stainless Steel NutsProperty Class Permissible AlloysA1-50 304, 304L, 305AA1-70 384, 189LW, 302HQA1-80A2-50A2-70 321, 347A2-80A4-50A4-70
29、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 1626.2 Ferritic Alloys, Grade F1:6.2.1 When Condition A is specified, th
30、e 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 shall be treatedas specified in 6.1.2.6.3 Martensitic Alloys, Grades C1, C3, and C4:6.3.1 When Cond
31、ition 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 Table 2.6.3.2 When Condition HT is specified, the nuts shall behardened and tempered by heating to
32、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 specifiedin Table 2.6.4 Precipitation-Hardening Alloy, Grade P1When Con-dition AH is specified, the nu
33、ts 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-cooling toprovide the properties specified in Table 2.7. Chemical Composition7.1 It is the intent of this
34、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 nuts of a specified property class, thechoice of alloy to be used shall be that of the fastenermanufa
35、cturer 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 order and shall have a chemical compositionconforming to the limits specified in Table 3.7.2.1 When the
36、purchaser specifies that a specific alloy beused, the alloy shall have a chemical composition conformingto the limits specified in Table 3.7.3 Product analysis may be made by the purchaser fromnuts representing each lot. The chemical composition thusdetermined shall conform to the limits specified i
37、n Table 3 forthe specific alloy within the product analysis tolerances speci-fied in Specification A555/A555M.7.3.1 In the event of discrepancy, a referee analysis ofsamples for each lot shall be made in accordance with 12.1.TABLE 2 Mechanical Property RequirementsProperty Class ConditionAAlloy/Mech
38、anicalProperty MarkingNominal ThreadDiameterProof LoadStress, MPaHardnessVickers Rockwellmin max min maxA1-50 F836AA2-50 A or AF F836B M1.6 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
39、 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 600 180 285 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
40、 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 900 285 370 C28 C38ALegend of Conditions:AFformed and annealed.CWformed from annealed stock, thus acquiring a degree of cold work.SHmachined from strain hardened st
41、ock.Amachined from annealed or solution annealed stock, thus retaining the properties of the original material, or hot formed and solution annealed.Hhardened and tempered at 565C medium.HThardened and tempered at 275C minimum.AHsolution annealed and age hardened after forming.F836M 1638. Corrosion R
42、esistance8.1 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 specification, shallbe capable of passing the test for susceptibility to intergranularcorrosion as speci
43、fied 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, specimens may be tested inaccordance with Practice E and be considered satisfactory ifpassing Practice E.9. M
44、echanical 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 loadtested.9.2 Unless proof load testing is specified in the inquiry andpurchase order, nuts of all c
45、lasses 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 than the minimum hardnessspecified in Table 2.9.3 All classes of nuts, except those covered in 9.2 shal
46、lwithstand the proof load as specified in Table 4.10. Dimensions10.1 Unless otherwise specified, nuts shall conform todimensions for hex nuts, Style 1, as given in ISO 4032.10.2 Unless otherwise specified, threads shall be metriccoarse threads with class 6H tolerances as specified in ASMEB1.13M.TABL
47、E 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 to 10.0 0.60 maxAA1 303Se S30323 0.15 2.00 0.20
48、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
49、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 3.0 to 4.0A1 302HQ S30433 0.03 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.0 3.0 to 4.0A4 316 S31600 0.08 2.00 0.045 0.030 1.00 16.0 to 18.0 10.0 to 14.0 2.003.00A4 316L S31603 0.03 2.00 0.045 0.030 1.00 16.0 to 18.0 10.0 to 14.0 2.003.00A4 321 S32100 0.08 2.00 0.045 0.030 1.00 17.0 to 19.0 9.0 to 12.0 Ti 5 CminA2 347 S34700 0.08 2.00 0.045 0.030 1
