1、Designation: F 738M 02METRICStandard Specification forStainless Steel Metric Bolts, Screws, and Studs1This standard is issued under the fixed designation F 738M; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revi
2、sion. A number 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 me
3、chanicalrequirements for stainless steel metric bolts, screws, and studswith nominal thread diameters M1.6 through M36 and isintended for use in engineering applications requiring generalcorrosion resistance.1.2 Eight groups of stainless steel alloys are covered,including three austenitic (Grades A1
4、, A2, and A4), one ferritic(Grade F1), three martensitic (Grades C1, C3, and C4), and oneprecipitation hardening (Grade P1).1.3 Twenty property classes are covered, including nineaustenitic, two ferritic, eight martensitic, and one precipitationhardening. The property classes with the permissible al
5、loys 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 inISO 3506.1.4.1 This specificat
6、ion includes all of the property classescovered in ISO 3506. Additionally, it includes property classesA1-70, A2-70, A4-70, A1-80, A2-80, and A4-80 for productswith nominal thread diameters larger than M20; and fournon-ISO property classes, C1-110, C4-110, C3-120; and P1-90.1.5 Supplementary require
7、ments 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 nuts for use with bolts, screws, and studsincluded in this specification are covered by SpecificationF 836M.1.7 The following safety ha
8、zards caveat pertains only tothe test method described in this specification. This standarddoes not purport to address the safety problems associated withits use. It is the responsibility of the user of this standard toestablish appropriate safety and health practices and deter-mine the applicabilit
9、y of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:A 276 Specification for Stainless Steel Bars and Shapes2A 342/A 342M Test Methods for Permeability of FeeblyMagnetic Materials3A 380 Practice for Cleaning, Descaling, and Passivation ofStainless Steel Parts, Equipment
10、, and Systems2A 484/A 484M Specification for General Requirements forStainless Steel Bars, Billets, and Forgings2A 493 Specification for Stainless Steel Wire and Wire Rodsfor Cold Heading and Cold Forging2A 555/A 555M Specification for General Requirements forStainless Steel Wire and Wire Rods2A 564
11、/A564M Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes3A 582/A 582M Specification for Free-Machining StainlessSteel Bars3A 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel Products2D 3951 Practice for Commercial Packaging4E 29 Pr
12、actice for Using Significant Digits in Test Data toDetermine Conformance with Specifications5E 353 Test Methods for Chemical Analysis of Stainless,Heat-Resisting, Maraging, and Other Similar Chromium-Nickel-Iron Alloys6F 606M Test Methods for Determining the MechanicalProperties of Externally and In
13、ternally Threaded Fasteners,Washers, and Rivets Metric7F 836M Specification for Style 1 Stainless Steel MetricNuts71This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.04 on NonferrousFasteners.Current edition approved A
14、pril 10, 2002. Published May 2002. Originallypublished as F 738 81. Last previous edition F 738M 01.2Annual Book of ASTM 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,
15、Vol 03.05.7Annual Book of ASTM Standards, Vol 01.08.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.F 1470 Guide for Fastener Sampling for Specified Mechani-cal Properties and Performance Inspection72.2 ISO Standard:ISO 3506 Corrosio
16、n-Resistant Stainless Steel Fasteners83. Classification3.1 The designation of each property class is composed ofthree parts: a letter, followed by a single digit, followed byeither two or three digits.3.1.1 The letter indicates the general composition type ofstainless steel as follows:3.1.1.1 A for
17、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) 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, 1
18、10, etc.) indicate10 % of the specified minimum tensile strength of the propertyclass.3.1.4 For example, Class A1-50 is an austenitic steel of anyone of six permitted alloys, and the manufactured fastener hasa minimum tensile strength of 500 MPa.4. Ordering Information4.1 Orders for bolts, screws an
19、d studs under this specifica-tion shall include the following:4.1.1 Quantity (number of pieces of each item).4.1.2 Name of item (bolt, screw, stud, etc.; specific type andstyle; and reference to dimensional standard when appropri-ate).4.1.3 Size (nominal diameter, thread pitch, length).4.1.4 Propert
20、y class.4.1.5 ASTM designation and date of issue. When date ofissue is not specified, fasteners shall be furnished to the latestissue.4.1.6 Supplementary requirements, if any (S1 through S5).4.1.7 Additional requirements, if any, to be specified on thepurchase order:4.1.7.1 Forming (5.2.1).4.1.7.2 T
21、hreading (5.2.2).4.1.7.3 Alloy condition (5.2.3).4.1.7.4 Protective finish (5.2.5).4.1.7.5 Alloy selection (7.2).4.1.7.6 Test report (9.2).4.1.7.7 Heat number (9.1.1).4.1.7.8 Additional testing (9.3).4.1.7.9 Inspection (11.1).4.1.7.10 Rejection (12.1).4.1.7.11 Certification (13.1).4.1.7.12 Marking (
22、14.1.3 and 14.1.4).NOTE 1Examples:10 000 hex-cap screws, ANSI B18.2.3.1M, M12 3 1.75 3 50, ClassA270, furnish test report, ASTM F 738, dated _.15 000 oval-head machine screws, Type 1 recess, ANSI B18.6.7M, M33 0.5 3 25, Class C4-70, 416Se, Supplementary Requirement S2, ASTMF 738, dated _.5. Material
23、s and Manufacture5.1 Materials:5.1.1 Specifications A 276, A 493, A 564/A 564M, andA 582/A 582M are noted for information only as suitablesources of material for the manufacture of bolts, hex capscrews, and studs to this specification.5.2 Manufacture:5.2.1 FormingUnless otherwise specified, fastener
24、s shallbe cold-formed, hot-formed, or machined, at the option of themanufacturer.5.2.2 ThreadsUnless otherwise specified, threads shall berolled or cut at the option of the manufacturer.5.2.3 ConditionFasteners shall be furnished in the condi-tion specified for the property class in Table 2. If othe
25、rconditions are required, the condition and resultant mechanicalproperties shall be as agreed upon between the manufacturerand the purchaser.5.2.4 Surface FinishFasteners shall have a surface finish8Available from American National Standards Institute, 11 West 42nd Street,13th Floor, New York, NY 10
26、036.TABLE 1 Property Classes of Stainless Steel Bolts, Screws, andStudsProperty Class Permissible AlloysA1-50 304, 304L, 305AA1-70 384, 189LW, 302HQA1-80A2-50A2-70 321, 347A2-80A4-50A4-70 316, 316LA4-80F1-45F1-60430BC1-50C1-70 410C1-110C3-80C3-120431C4-50C4-70 416, 416SeC4-110P1-90 630AWhen approved
27、 by the purchaser, Alloys 303, 303Se, or XM1 may befurnished.BWhen approved by the purchaser, Alloy 430F may be furnished.F 738M2produced in accordance with Practice A 380.5.2.5 Protective FinishesUnless otherwise specified, fas-teners shall be furnished without an additive chemical ormetallic finis
28、h.6. Heat Treatment6.1 Austenitic Alloys, Grades A1, A2, and A46.1.1 When Condition AF is specified, the fasteners, follow-ing manufacture, shall be annealed by heating to 1040 6 30C,at which time the chromium carbide will go into solution. Thefasteners shall be held for a sufficient time and then c
29、ooled ata rate sufficient to prevent precipitation of the carbide and toprovide the properties specified in Table 2.TABLE 2 Mechanical Property RequirementsPropertyClassCondi-tionAAlloy/MechanicalPropertyMarkingNominalThreadDiameterProductLengthBFull Size Product Tests Machined Specimen Tests Hardne
30、ssTensileStrength,MPaCYieldStrength,MPaC,DExten-sionETorsionalStrength,NmFTensileStrength,MPaYieldStrength,MPaElonga-gation,%Vickers Rockwellmin min min min min min min min max min maxA1-50 F 738A M1.6M5 all 500 . . . . . . Table 6 . . . . . . . . . . . . 165 . . . B85A2-50 AF F 738B M6M36 all 500 2
31、10 0.6D . . . 500 210 30 . . . 165 . . . B85A4-50 F 738CA1-70 F 738D M1.6M5 8D 700 . . . . . . Table 6 . . . . . . . . . 220 330 B96 C33A2-70 CW F 738E M6M20 8D 700 450 0.4D . . . 650 400 20 220 330 B96 C33A4-70 F 738F overM20M368D 550 300 0.2Dx. . . 520 270 25 160 310 B83 C31M1.6M5 8D 800 . . . . .
32、 . Table 6 . . . . . . . . . 240 350 C23 C36A1-80 F 738G M6M20 8D 800 600 0.3D . . . 780 600 12 240 350 C23 C36A2-80 SH F 738H overM20M248D 700 500 0.2D . . . 680 480 15 220 330 B96 C33A4-80 F 738J overM24M308D 650 400 0.2D . . . 620 370 20 200 310 B93 C30overM30M368D 600 300 0.2D . . . 570 270 28 1
33、80 285 B89 C28F1-45 AF F 738K M1.6M5 all 450 . . . . . . . . . . . . . . . . . . . . . 165 . . . B85M6M36 all 450 250 0.2D . . . 450 250 25 . . . 165 . . . B85F1-60 CW F 738L M1.6M5 8D 600 . . . . . . 180 285 B89 C28M6M36 8D 600 410 0.2D . . . 550 360 20 180 285 B89 C28C1-50C4-50 AF 738MF 738NM1.6M5
34、M6M36allall500500.250.0.2D.500.250.20.165165.B85B85C1-70C4-70 HF 738PF 738RM1.6M5M6M36allall700700.410.0.2D.700.410.18220220330330B96B96C34C34C1-110C4-110 HTF 738SF 738TM1.6M5M6M36allall11001100.820.0.2D.1100.820.12350350440440C36C36C45C45C3-80 H F 738U M1.6M5 all 800 . . . . . . . . . . . . . . . .
35、 . . 240 340 C23 C35M6M36 all 800 640 0.2D . . . 800 640 15 240 340 C23 C35C3-120 HT F 738V M1.6M5 all 1200 . . . . . . . . . . . . . . . . . . 380 480 C39 C48M6M36 all 1200 950 0.2D . . . 1200 950 10 380 480 C39 C48P1-90 AH F 738W M1.6M5 all 900 . . . . . . . . . . . . . . . . . . 285 370 C28 C38M6
36、M36 all 900 700 0.2D . . . 900 700 16 285 370 C28 C38ALegend of conditions:AF headed and rolled from annealed stock and then reannealed.CW headed and rolled from annealed stock, thus acquiring a degree of cold work; products with nominal thread diameters larger than M20 may be hot-worked andsolution
37、 annealed.SH machined from strain-hardened stock or cold worked to develop the specified properties.A machined from annealed or solution-annealed stock, thus retaining the properties of the original material.H hardened and tempered at 565C minimum.HT hardened and tempered at 275C minimum.AH solution
38、-annealed and age-hardened after forming.BFor product lengths:“all” means all lengths“8D ” means 8 times nominal diameter maximum.CTensile strength and yield strength values for full-size products of each property class are given in table on yield and tensile strength.DYield strength is the stress a
39、t which an offset of 0.2 % gage lingth occurs.EExtension measurement is determined in accordance with the test procedure specified in 10.2.3.FTorsional strength requirements apply only to austenitic steel fasteners with nominal thread diameters M5 and smaller. Values are given in table on torsional
40、strength.F 738M36.1.2 When Condition CW is specified, the austenitic alloyshall be annealed as specified in 6.1.1, generally by the rawmaterial manufacturer, and then cold-worked to develop theproperties specified in Table 2.6.2 Ferritic Alloys, Grade F16.2.1 When Condition AF is specified, the ferr
41、itic 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 CW is specified, the ferritic alloyshall be annealed as specified in 6.2.1, generally by the rawmaterial manufacturer and then
42、cold-worked to develop theproperties specified in Table 2.6.3 Martensitic Alloys, Grades C1, C3, and C46.3.1 When Condition A is specified, the fasteners, follow-ing manufacture, shall be annealed to provide the propertiesspecified in Table 2.6.3.2 When Condition H is specified, the fasteners shall
43、behardened and tempered by heating to 1010 6 30C sufficientfor austenitization, holding for at least12 h, rapid air- oroil-quenching, reheating to 565C minimum, and holding for atleast 1 h and then air-cooling to provide the properties specifiedin Table 2.6.3.3 When Condition HT is specified, the fa
44、steners 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, holding for atleast 1 h, and then air-cooling to provide the propertiesspecified in Table 2.6.4 Precipitation-Hardening Alloy
45、, Grade P1When Con-dition AH is specified, the fasteners shall be solution-annealedand aged by heating to 1040 6 15C, holding for at least12 h,rapid air- or oil-quenching to 27C maximum, reheating to 6206 10C minimum, holding for 4 h, and then air-cooling toprovide the properties specified in Table
46、2.7. Chemical Composition7.1 It is the intent of this specification that fasteners 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 fasteners of a specified property class,th
47、e choice of alloy to be used shall be that of the fastenermanufacturer as determined by his fastener fabrication meth-ods and material availability. The specific alloy used by themanufacturer shall be clearly identified on any certificationrequired in the purchase order and shall have a chemicalcomp
48、osition conforming 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 fromfinished fasteners representing each l
49、ot. The chemical compo-sition thus determined shall conform to the limits specified inTABLE 3 Chemical RequirementsAlloyGroupAlloy UNSDesig-nationComposition, % maximum except as shownCar-bonManga-nesePhospho-rusSulfur Silicon Chromium Nickel Copper Molyb-denumOthersAustenitic AlloysA1 303 S30300 0.15 2.00 0.20 0.15 min 1.00 17.019.0 8.010.0 0.60 maxAA1 303Se S30323 0.15 2.00 0.20 0.060 1.00 17.019.0 8.010.0 Se 0.15 minA1 304 S30400 0.08 2.00 0.045 0.030 1.00 18.020.0 8.010.5 1.00A1 304L S30403 0.03
