1、Designation: F836M 02 (Reapproved 2010)Standard 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 la
2、st revision. A number 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 Department of Defense.1. Scope1.1 This specification covers the chemical
3、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,including three austenitic (Grades A1, A2, and A4),
4、 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 classes with the permissible alloys foreach
5、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 inISO 3506.1.4.1 This specification includes
6、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, andP1-90.1.5 Supplementary requirements of an optio
7、nal 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 SpecificationF738M. Unless otherwise specified, all bolt
8、s, 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 thisstandard.2. Referenced Documents2.1 ASTM S
9、tandards:2A262 Practices for Detecting Susceptibility to IntergranularAttack in Austenitic Stainless SteelsA342/A342M Test Methods for Permeability of FeeblyMagnetic MaterialsA380 Practice for Cleaning, Descaling, and Passivation ofStainless Steel Parts, Equipment, and SystemsA493 Specification for
10、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 Steel Bars and ShapesA582/A582M Specification for Free-Machining
11、 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 SpecificationsF606M Test Methods for Determining the MechanicalProperti
12、es of Externally and Internally Threaded Fasteners,Washers, and Rivets (Metric)F738M Specification for Stainless Steel Metric Bolts,Screws, and StudsF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance Inspection2.2 ISO Standard:ISO 3506 Corrosion-Resistant Stain
13、less Steel Fasteners32.3 ASME Standards:ASME B1.13M Metric Screw ThreadsM Profile3ASME B18.2.4.1M Metric Hex Nuts, Style 13NOTE 1The following ASTM standards are noted for informationonly as suitable sources of material for the manufacture of nuts to this1This specification is under the jurisdiction
14、 of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.04 on NonferrousFasteners.Current edition approved Oct. 1, 2010. Published January 2011. Originallyapproved in 1983. Last previous edition approved in 2002 as F536 02. DOI:10.1520/F0836M-02R10.2For referenced AST
15、M 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.3Available from American Society of Mechanical Engineers (ASME), ASMEInternation
16、al Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.org1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.specification: Specifications A493, A564/A564M, and A582/A582M.3. Classification3.1 The designation of each
17、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 steels,3.1.1.2 F for ferritic steels,3.1.1.3 C for martensitic steels
18、, 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.) indicate10 % of the specified nut proof load stress of the property cl
19、ass.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 thefollowing :4.1.1 Quantity (number of pieces of each item);4.1.2
20、 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 nuts under this specification may includethe following optional r
21、equirements: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);4.1.6.8 Heat number (11.1.1);4.1.6.9 Certification (15.1);4.1.6.10
22、 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, ASME B18.2.4.1M,M631, Class A2-70, furnish test report, ASTM F836M XX.15 000 pieces, Hex Flange Nuts, ASME B18.
23、2.4.4M, M8 3 1.25,class A4-50, 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 shall be furnished in the conditionspecified for the prop
24、erty 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 descaled in accordance with Practice A380.6. Heat Treatmen
25、t6.1 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, thusretaining the properties of the original material, or hot formedand solution annealed.6.1.2 When Condition AF is specified, the nuts, followingma
26、nufacture, 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 precipitation of the carbide and to providethe properties specified in Table 2.6.1.3 When Conditi
27、on 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-chined from strain hardened stock.6.2 Ferritic Alloys, Grade F1:6.2.1 When Condition A is specifi
28、ed, 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 shall be treatedas specified in 6.1.2.6.3 Martensitic Alloys, Grades C1, C3, and C4:6.3.1 Whe
29、n Condition H is specified, the nuts shall behardened and tempered by heating to 1010 6 30C sufficientTABLE 1 Property Classes of Stainless Steel NutsProperty Class Permissible AlloysA1-50 304, 304L, 305AA1-70 384, 189LW, 302HQA1-80A2-50A2-70 321, 347A2-80A4-50A4-70 316, 316LA4-80F1-45 430BC1-70 410
30、C1-110C3-80 431C3-120C4-70 416, 416SeC4-110P1-90 630AWhen approved by the purchaser, Alloys 303, 303Se, or XM1 may befurnished.BWhen approved by the purchaser, Alloy 430F may be furnished.F836M 02 (2010)2for austenitization, holding for at least 1 h and then air-coolingto provide the properties spec
31、ified in 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 prope
32、rties specifiedin 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 ai
33、r-cooling 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 permitt
34、ed for nuts 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 purch
35、ase order and shall have a chemical compositionconforming to the limits specified in Table 3.7.2.1 When the purchaser specifies that a specific alloy beused, the alloy shall have a chemical composition conformingto the limits specified in Table 3.7.3 Product analysis may be made by the purchaser fro
36、mnuts 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 discrepancy, a referee analysis ofsamples for each lot shall
37、 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 specification, shallbe capable of passing the test for su
38、sceptibility to intergranularcorrosion as specified in Practice E of Practices A262.8.1.2 As stated in PracticesA262, 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 con
39、sidered satisfactory ifpassing Practice E.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 to M36 500 155 220 B81 B95A4-50 F836CA1-70
40、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 600 180 285 B89 C28F1-45 A or AF F836K M1.6 to
41、 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 900 285 370 C28 C38ALegend of Conditions:AFform
42、ed 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 annealed.Hhardened and tempered at 565C medi
43、um.HThardened and tempered at 275C minimum.AHsolution annealed and age hardened after forming.F836M 02 (2010)39. 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 th
44、at are proof 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 hardnes
45、s not less than the minimum hardnessspecified in Table 2.9.3 All classes of nuts, except those covered in 9.2 shallwithstand 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 inASME B18.2.4.1M.10.2 Un
46、less otherwise specified, threads shall be metriccoarse threads with class 6H tolerances as specified inASME B1.13M.11. Number of Tests and Retests11.1 The mechanical and chemical composition require-ments of this specification shall be met in continuous massproduction for stock, and the manufacture
47、r shall make sampleinspections to ensure that the product conforms to the specifiedrequirements. Additional tests of individual shipments ofmaterial are not ordinarily necessary.11.1.1 Individual heats of steel are not identified in thefinished product. When specified in the purchase order that theh
48、eat number shall be identified for the products in an individualshipment, the manufacturer shall control the product by heatanalysis and additionally shall conduct the testing programspecified in 11.1.11.2 Unless otherwise specified, tests for corrosion resis-tance shall be in accordance with the ma
49、nufacturers standardquality control practices. A specific number of tests is notrequired but the nuts shall be produced by manufacturingpractices and subjected to tests and inspection to assurecompliance with the specified requirements.11.2.1 When specified on the purchase order, not less thanone corrosion test to determine freedom from precipitatedcarbides shall be made to represent each lot.11.3 When the purchaser requires that additional tests beperformed by the manufacturer to determine that the propertiesof nuts in an individual shipment
