1、Designation: F837 13 (Reapproved 2018)Standard Specification forStainless Steel Socket Head Cap Screws1This standard is issued under the fixed designation F837; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last revis
2、ion.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon () 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 me
3、chanicalrequirements for stainless steel inch socket head cap screw(SHCS) with nominal thread 0.060 through 1.500 in. andintended for use in applications requiring general corrosionresistance.1.2 Three groups of stainless steel alloys are covered,austenitic Group 1 and 2 and martensitic Group 5.1.3
4、Four property conditions are covered: austenitic AlloyGroups 1 and 2 in an annealed condition (AF) at 85 ksimaximum, in two cold worked conditions (CW) at 80 ksiminimum, (CW1) at 102 ksi minimum, and martensitic AlloyGroup 5 in a heat treated condition (HT) at 160 ksi minimum.1.4 The values stated i
5、n inch-pound units are to be regardedas standard. No other units of measurement are included in thisstandard.1.5 The following precautionary caveat pertains only to thetest method portion, Section 13, of this specification: Thisstandard does not purport to address all of the safety concerns,if any,
6、associated with its use. It is the responsibility of the userof this standard to establish appropriate safety, health, andenvironmental practices and determine the applicability ofregulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally re
7、cognized 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 TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A262 Practices for
8、 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 SystemsA555/A555M Specification for General Requirements f
9、orStainless Steel Wire and Wire RodsA751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel ProductsA967 Specification for Chemical Passivation Treatments forStainless Steel PartsD3951 Practice for Commercial PackagingE18 Test Methods for Rockwell Hardness of Metallic Ma-terial
10、sE92 Test Methods for Vickers Hardness and Knoop Hard-ness of Metallic MaterialsE384 Test Method for Microindentation Hardness of Mate-rialsF606 Test Methods for Determining the Mechanical Proper-ties of Externally and Internally Threaded Fasteners,Washers, and Rivets (Metric) F0606_F0606MF788/F788M
11、 Specification for Surface Discontinuities ofBolts, Screws, and Studs, Inch and Metric SeriesF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance Inspection2.2 ASME Standard:ASME B18.3 Socket Cap, Shoulder, and Set ScrewsInchSeries32.3 JIS Standard:4JIS G 4311 He
12、at Resisting Steel Bar and Wire Rods31This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.04 on NonferrousFasteners.Current edition approved Sept. 1, 2018. Published September 2018. Originallyapproved in 1988. Last previ
13、ous edition approved in 2013 as F837 131. DOI:10.1520/F0837-13R18.2For 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 web
14、site.3Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Two Park Ave., New York, NY 10016-5990, http:/www.asme.org.4Available from Japanese StandardsAssociation (JSA), Mita MT Bldg., 3-13-12Mita, Minato-ku, Tokyo 108-0073, Japan, http:/www.jsa.or.jp.*A S
15、ummary 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 developed in accordance with internationally recognized principles on standardization establis
16、hed 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.13. Classification3.1 The austenitic stainless steel socket head cap screw shallbe designated F837 Group 1 or
17、 2 Condition AF, F837 Group 1or 2 Condition CW, or F837 Group 1 or 2 Condition CW1.3.2 The martensitic stainless steel socket head cap screwshall be designated F837 Group 5 Condition HT.4. Ordering Information4.1 Orders for socket head cap screws under this specifica-tion shall include:4.1.1 Quantit
18、y (number of pieces of each item).4.1.2 Name of the item (socket head cap screws, SHCS).4.1.3 Size (nominal diameter, thread pitch, thread class,screw length) or part number.4.1.4 Alloy Group (see 7.1) and Condition (Group 1 or 2AF, Group 1 or 2 CW, Group 1 or 2 CW1, or Group 5 HT).4.1.5 ASTM specif
19、ication and year of issue. When year ofissue is not specified, fasteners shall be furnished to the latestissue.4.1.6 Supplementary requirements, if any, (see S1 throughS7).4.1.7 Additional special requirements, if any, to be specifiedon the purchase order:4.1.7.1 Forming (see 5.1).4.1.7.2 Threading
20、(see 5.2).4.1.7.3 Surface finish (see 11.1).4.1.7.4 Alloy selection (see 7.2).4.1.7.5 Test report (see 12.2).4.1.7.6 Additional testing (see 12.3).4.1.7.7 Inspection (see 14.1).4.1.7.8 Rejection (see 15.1).4.1.7.9 Certification (see 16.1).4.1.7.10 Special packaging requirements (see 18.3).4.1.7.11 S
21、upplementary requirements as needed.5. Materials and Manufacture5.1 HeadsUnless otherwise specified the head and socketrecess of the screw may be hot forged, cold forged, ormachined at the option of the manufacturer. Users requiringcold forged heads should specify Supplementary RequirementsS6.5.2 Th
22、readsUnless otherwise specified, screws in sizes upto 1.00 in. inclusive and product lengths up to 6 in. inclusive,shall have threads formed by rolling, except by special agree-ment with the purchaser. Larger products may be rolled, cut, orground at the option of the manufacturer.6. Heat Treatment6.
23、1 Austenitic alloys Group 1 or 2 Condition AF screws,following manufacture, shall be annealed by heating to 1900 650 F to obtain maximum corrosion resistance and minimumpermeability. The screws shall be held for a sufficient time attemperature and then cooled at a rate sufficient to preventprecipita
24、tion of the carbide and to provide the propertiesspecified in Table 1.6.2 When Condition CW or CW1 is specified, the austeniticalloys shall be annealed as specified in 6.1 generally by the rawmaterial manufacturer, then cold worked to develop specificproperties.6.3 Martensitic alloy Group 5 Conditio
25、n HT screws shall behardened and tempered by heating to 1800 6 50 F sufficientfor austenitization, holding for at least12 h, rapid air or oilquenching, reheating to 525 F minimum and holding for atleast 1 h and then air cooling to provide the properties specifiedin Table 1.7. Chemical Properties7.1
26、It is the intent of this specification that screws shall beordered by alloy group and condition. The chemical composi-tion of the screw material shall conform to the requirements ofTable 2.7.2 Unless otherwise specified in the inquiry and purchaseorder (see Supplementary Requirements S2) the choice
27、of analloy from within a group shall be at the discretion of thefastener manufacturer as required by their method of fastenerfabrication and material availability. The specific alloy used bythe manufacturer shall be clearly identified on all certificationrequired in the purchase order and shall have
28、 chemical com-position conforming to the limits specified in Table 2.7.3 When chemical analysis is performed by the purchaserusing finished fasteners representing each lot, the chemicalTABLE 1 Mechanical Property RequirementsAlloyGroupConditionAlloyMechanicalPropertyMarkingNominalThreadDiameterAFull
29、-Size Product Machine Specimen Core HardnessBTensileStrength, ksiMinimumExtensionCTensileStrength, ksiYield Strength,ksiMinimumElongation,%Vickers Rockwell1 AF F837A 0.0601.500 85 max 0.6D 85 max 55 max 40 210 max 95 HRB max1 CW F837B 0.0600.750 80 min 0.4D 80 min 40 min 25 150 min 50 HRA min1 CW1 F
30、837C 0.0600.750 102 min 0.4D 87 min 65 min 20 220 min 59 HRA min2 AF F837D 0.0601.500 85 max 0.6D 85 max 55 max 40 210 max 95 HRB max2 CW F837E 0.0600.750 80 min 0.4D 80 min 40 min 25 150 min 50 HRA min2 CW1 F837F 0.0600.750 102 min 0.4D 87 min 65 min 20 220 min 59 HRA min5 HT F837G 0.0600.190 180 m
31、in . . . . . . . . . . . . 350423 3643 HRC5 HT F837H 0.2501.500 180 min 0.2D 160 min 120 min 12 350423 3643 HRCAFor CW and CW1 condition fasteners with nominal thread diameter larger than 0.750 in., the mechanical properties and marking shall be agreed upon between the userand manufacturer.BCore har
32、dness is only required when full-size product tensile testing cannot be accomplished.CD denotes nominal thread size.F837 13 (2018)2contents obtained shall conform to the limits specified in Table2 for the specific alloy. Chemical contents shall conform to thetolerances specified in Specification A55
33、5/A555M.7.3.1 In the event of discrepancy, a referee analysis asspecified in 13.1 of samples for each lot shall be made inaccordance with 12.3.1.8. Mechanical Properties8.1 Screws shall be tested in accordance with the mechani-cal testing requirements for the alloy group and conditionnominal thread
34、diameter, length, and specified minimum ten-sile strength as specified in Table 3 and shall meet themechanical requirements specified for that product in Table 1.8.2 For products on which both hardness and tension testsare performed, acceptance based on tensile requirements shalltake precedence over
35、 low hardness readings (see Table 4).9. Corrosion Resistance9.1 Carbide Precipitation:9.1.1 Rod, bar, and wire in the austenitic alloy groups 1 and2 (not including the free-machining grade 303) used to makefasteners in accordance with this specification shall be capableof passing the test for suscep
36、tibility to intergranular corrosionas specified in Practice E of Practice A262.9.1.2 As stated in Practices A262, samples may be subjectedto the faster and more severe screening test in accordance withPractice A. Failing Practice A, specimens shall be tested toPractice E and be considered satisfacto
37、ry if passing Practice E.10. Dimensions10.1 Unless otherwise specified, the products shall conformto the requirements of ASME B18.3.11. Workmanship, Finish, and Appearance11.1 Surface TreatmentUnless otherwise specified, screwsshall be cleaned, descaled and passivated in accordance withPractice A380
38、 or Specification A967 at the option of themanufacturer.11.2 The surface discontinuities for these products shallconform to Specification F788/F788M and the additionallimitations specified herein.11.2.1 Forging defects that connect the socket to the periph-ery of the head are not permissible. Defect
39、s originating on theperiphery and with a traverse indicating a potential to intersectare not permissible. Other forging defects are permissibleprovided those located in the bearing area, fillet, and topsurfaces shall not have a depth exceeding 0.03 D or 0.005 in,whichever is greater. For peripheral
40、discontinuities, the maxi-mum depth may be 0.06 D (see Fig. 1).11.2.2 Forging defects located in the socket wall within 0.1times the actual key engagement, T, from the bottom of thesocket are not permissible. Discontinuities located elsewhere inthe socket shall not have a length exceeding 0.25 T,ora
41、maximum depth of 0.03 D not to exceed 0.005 in. (see Fig. 2).11.2.3 Seams in the shank shall not exceed a depth of 0.03D or 0.008 in., whichever is greater.TABLE 2 Chemical RequirementsAlloyGroupUNSDesignationAlloyComposition, % maximum except as shownCarbon ManganesePhosphorusSulfur Silicon Chromiu
42、m Nickel Copper MolybdenumAustenitic Alloys1 S30300 303A0.15 2.00 0.20 0.15 min 1.00 17.0 to 19.0 8.0 to 10.0 . . . 0.60 maxB1 S30400 304 0.08 2.00 0.045 0.030 1.00 18.0 to 20.0 8.0 to 10.5 1.00 . . .1 S30403 304L 0.030 2.00 0.045 0.030 1.00 18.0 to 20.0 8.0 to 12.0 1.00 . . .1 S30500 305 0.12 2.00
43、0.045 0.030 1.00 17.0 to 19.0 10.5 to 13.0 1.00 . . .1 S38400 384 0.08 2.00 0.045 0.030 1.00 15.0 to 17.0 17.0 to 19.0 . . . . . .1 S20300 XM1A0.08 5.0 to 6.5 0.040 0.18 to 0.35 1.00 16.0 to 18.0 5.0 to 6.5 1.75 to 2.25 0.50 maxB1 S30430 18-9LW 0.10 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.0 3.0
44、0 to 4.00 . . .1 S30433 302HQ 0.03 2.00 0.045 0.030 4.00 17.0 to 19.0 8.0 to 10.0 3.0 to 4.0 . . .1 . 304J3C0.08 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.5 1.00 to 3.00 .2 S31600 316 0.08 2.00 0.045 0.030 1.00 16.0 to 18.0 10.0 to 14.0 . . . 2.0 to 3.02 S31603 316L 0.03 2.00 0.045 0.030 1.00 16.
45、0 to 18.0 10.0 to 14.0 . . . 2.0 to 3.0Martensitic Alloys5 UNS41000 410 0.15 1.00 0.040 0.030 1.00 11.5 to 13.5 . . .AFree machining grades are not recommended for forged product. These grades may be furnished only when approved by the purchaser.BAt manufacturers option, determined only when intenti
46、onally added.C304J3 from JIS standard G 4311.TABLE 3 Mechanical Testing RequirementsItem Product LengthHardnessTest Conducted Using Full SizeProductTest Conducted Using Machined Test Specificationmax min Extension Axial TensileStrengthYield Strength0.2 % offsetTensileStrengthElongation1 #3 DAB B. .
47、. . .2D-12 in.B.BB. . .3 Over 12 in.B. AABBBAD denotes nominal diameter of product.BDenotes mandatory test. In addition, either all tests denoted by A or all tests denoted by B shall be performed. In case of arbitration full size tests, denoted A, shall bedecisive.F837 13 (2018)311.2.4 No transverse
48、 discontinuities shall be permitted inthe head-to-shank fillet area.11.2.5 Threads shall have no laps at the root or on the flankslocated below the pitch line. Laps are permitted at the crests(Fig. 3) that do not exceed 25 % of the basic thread depth, andon the flanks outside the pitch cylinder. Lon
49、gitudinal seamsrolled beneath the root of the thread and across the crests of cutthreads are acceptable within the limits of 11.2.3.12. Number of Tests12.1 The requirements of this specification shall be met incontinuous mass production for stock, and the manufacturershall make sample inspections to ensure that the productconforms to the specified requirements. Additional tests ofindividual shipments of fasteners are not ordinarily necessary.A record of the individual heat of steel in each lot shall bemaintained. The containers shall be coded to permit iden
