1、Designation: F 836M 02METRICStandard Specification forStyle 1 Stainless Steel Metric Nuts1This standard is issued under the fixed designation F 836M; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A numb
2、er in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 and mechanicalrequ
3、irements 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), one ferritic(Grad
4、e 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 Tabl
5、e 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 prope
6、rtyclasses 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 areprov
7、ided, 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 SpecificationF 738M. Unless otherwise specified, all bolts, hex cap screws
8、,and studs used with these nuts shall conform to the require-ments of Specification F 738M and shall be of the same alloygroup.2. Referenced Documents2.1 ASTM Standards:A 262 Practices for Detecting Susceptibility to Intergranu-lar Attack in Austenitic Stainless Steels2A 342 Test Methods for Permeab
9、ility of Feebly MagneticMaterials3A 380 Practice for Cleaning, Descaling, and Passivation ofStainless Steel Parts, Equipment, and Systems2A 493 Specification for Stainless Steel Wire and Wire Rodsfor Cold Heading and Cold Forging Wire2A 555/A 555M Specification for General Requirements forStainless
10、Steel Wire and Wire Rods2A 564/A 564M Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes2A 582 Specification for Free-Machining Stainless SteelBars2A 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel Products2D 3951 Practice for Comm
11、ercial Packaging4E 29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications5F 606M Test Methods for Determining the MechanicalProperties of Externally and Internally Threaded Fasteners,Washers, and Rivets Metric6F 738M Specification for Stainless Steel Metric
12、 Bolts,Screws, and Studs6F 1470 Guide for Fastener Sampling for Specified Mechani-cal Properties and Performance Inspection62.2 ISO Standard:ISO 3506 Corrosion-Resistant Stainless Steel Fasteners72.3 ASME Standards:ASME B1.13M Metric Screw ThreadsM Profile7ASME B18.2.4.1M Metric Hex Nuts, Style 171T
13、his specification is under the jurisdiction of ASTM Committee F16 onFastenersand is the direct responsibility of Subcommittee F16.04 on NonferrousFasteners.Current edition approved April 10, 2002. Published May 2002. Originallypublished as F 536 83. Last previous edition F 836 01a.2Annual Book of AS
14、TM Standards, Vol 01.03.3Annual Book of ASTM Standards, Vol 03.04.4Annual Book of ASTM Standards, Vol 15.09.5Annual Book of ASTM Standards, Vol 14.02.6Annual Book of ASTM Standards, Vol 01.08.7Available from American Society of Mechanical Engineers, P.O. Box 2300Fairfield, NJ 07007-2300.1Copyright A
15、STM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.NOTE 1The following ASTM standards are noted for informationonly as suitable sources of material for the manufacture of nuts to thisspecification: Specifications A 493, A 564, and A 582.3. Classifi
16、cation3.1 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 steels,3.1.1.2 F for ferritic steel
17、s,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.) indicate10 % of the specified nut pr
18、oof 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 thefollowing :4.1.1 Quantity (nu
19、mber 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 nuts under this specification m
20、ay 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);4.1.6.8 Heat number (11.1.1);4.1
21、.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, ASME B18.2.4.1M, M6 31, Class A2-70, furnish test report, ASTM F 836M XX.15 0
22、00 pieces, Hex Flange Nuts, ASME B18.2.4.4M, M8 3 1.25,class A4-50, Supplementary Requirement S3, ASTM F 836 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
23、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 descaled in accordan
24、ce with Practice A 380.6. 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, thusretaining the properties of the original material, or hot formedand solution annealed.6.1.2 When Condition
25、 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 precipitation of the carbide and to providethe properties
26、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-chined from strain hardened stock.6.2 Ferritic Alloys, Gra
27、de 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 shall be treatedas specified in 6.1.2.6.3 Martensitic
28、Alloys, Grades C1, C3, and C4:6.3.1 When Condition H is specified, the nuts shall beTABLE 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 410C1-110C3-80 431C3-
29、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.F 836M2hardened and tempered by heating to 1010 6 30C sufficientfor austenitization, holding for at least 1 h and then air-cooling
30、to provide the properties specified 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 ai
31、r-cooling to provide the properties 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
32、, 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 specification that nuts shall beordered by property class.7.2 Unless otherwise specified in the inquiry and purchaseorder (see Supplementary Requirement S2), when
33、 two or morealloys are permitted 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 cert
34、ification required inthe purchase 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 ma
35、y 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 A 555.7.3.1 In the event of discrepancy, a referee analysis ofs
36、amples 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 specification, shallbe capable o
37、f passing the test for susceptibility to intergranularcorrosion as specified in Practice E of Practices A 262.8.1.2 As stated in Practices A 262, samples may be sub-jected to the faster and more severe screening test in accor-dance with Practice A. Failing Practice A, specimens may betested in accor
38、dance with Practice E and be consideredsatisfactory if passing 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 shallTABLE 2 Mechanical Property RequirementsProperty Class ConditionAAlloy/Mechanica
39、lProperty 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 M20
40、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 350
41、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 stock.A
42、machined 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.F 836M3be the only hardness
43、requirement for nuts that 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 theba
44、sis 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 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 in
45、 ASMEB18.2.4.1M.10.2 Unless otherwise specified, threads shall be metriccoarse threads with class 6H tolerances as specified in ASMEB1.13M.11. Number of Tests and Retests11.1 The mechanical and chemical composition require-ments of this specification shall be met in continuous massproduction for sto
46、ck, and the manufacturer 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 p
47、urchase order that theheat 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
48、 accordance with the manufacturers 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 ord
49、er, 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 are within specified limits,the purchaser shall specify Supplementary Requirement S1 inthe inquiry and purchase order.11.3.1 When the purchaser does not specify the samplingplan and basis of acceptance the following shall apply:TABLE 3 Chemical RequirementsAlloyGroupAlloyUNSDesig-
