1、Designation: A437/A437M 10Standard Specification forStainless and Alloy-Steel Turbine-Type Bolting SpeciallyHeat Treated for High-Temperature Service1This standard is issued under the fixed designation A437/A437M; the number immediately following the designation indicates the yearof original adoptio
2、n or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification2covers stainless and alloy-steel bolt-ing specially hea
3、t treated for high-temperature service, such assteam turbine, gas turbine, and similar uses. See SpecificationA962/A962M for the definition of bolting. This materialrequires special processing and should not be used in general-purpose applications. Bolting furnished as bars shall be hotwrought and m
4、ay be further processed by centerless grindingor by cold drawing.1.2 The high-temperature properties of the bolting coveredby this specification are dependent upon special heat treatment,which is required. Although the high-temperature propertiesare not specified, they are implied by control of the
5、chemistry,heat treatment, and room-temperature properties of the mate-rial.1.3 Three levels of bolting strength are covered, designatedGrades B4B, B4C, and B4D.1.4 The following referenced general requirements are in-dispensable for application of this specification: SpecificationA962/A962M.1.5 Supp
6、lementary requirements are provided for use at theoption of the purchaser. The supplementary requirements shallapply only when specified individually by the purchaser in thepurchase order or contract.1.6 This specification is expressed in both inch-pound unitsand in SI units; however, unless the pur
7、chase order or contractspecifies the applicable M specification designation (SI units),the inch-pound units shall apply.1.7 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. Within the text, theSI units are shown in brackets. The values stated in each
8、system may not be exact equivalents; therefore, each systemshall be used independently of the other. Combining valuesfrom the two systems may result in non-conformance with thestandard.2. Referenced Documents2.1 ASTM Standards:3A962/A962M Specification for Common Requirements forBolting Intended for
9、 Use at Any Temperature from Cryo-genic to the Creep Range3. Ordering Information3.1 It shall be the responsibility of the purchaser to specifyall requirements necessary for product under this specification.Such requirements to be considered include, but are not limitedto, the following:3.1.1 Specif
10、ication designation, grade, issue date, and revi-sion letter,3.1.2 Quantity (weight or number of pieces),3.1.3 Description (bars, bolts, nuts, etc.),3.1.4 Dimensions,3.1.5 Finish, and3.1.6 Impact testing of nuts, if required (see Section 9).4. Common Requirements4.1 Bolting supplied to this specific
11、ation shall conform tothe requirements of SpecificationA962/A962M. These require-ments include test methods, finish, thread dimensions, macro-etch (Grade B4D only), marking, certification, optional supple-mentary requirements, and others. Failure to comply with therequirements of Specification A962/
12、A962M constitutes non-conformance with this specification. In case of conflict be-tween this specification and Specification A962/A962M, thisspecification shall prevail.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct r
13、esponsibility of SubcommitteeA01.22 on Steel Forgings and Wrought Fittings for Piping Applications and BoltingMaterials for Piping and Special Purpose Applications.Current edition approved April 1, 2010. Published May 2010. Originallyapproved in 1959. Last previous edition approved in 2006 as A437/A
14、437M06.DOI: 10.1520/A0437_A0437M-10.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA-437 in Section II of that code.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMSta
15、ndards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5. Discard5.1 A sufficient d
16、iscard shall be made from each ingot toensure freedom from injurious piping and undue segregation.6. Heat Treatment6.1 Grades B4B and B4C shall be heated to a temperaturerange of 1875 to 1925 F 1025 to 1050 C and liquidquenched to below 600 F 316 C. The material Grades B4Band B4C shall then be unifo
17、rmly reheated for tempering at atempering temperature at least 100 F 55 C higher than theproposed operating temperature but not less than 1150 F 620C, then air or furnace cooled to room temperature. Thematerial shall be at the tempering temperature for a minimumof 2 h. Double tempering may be used t
18、o enhance properties.6.2 Grade B4D shall be heated to a temperature range of1700 to 1750 F 925 to 954 C and oil quenched. Thematerial shall then be uniformly reheated or tempered at atemperature of 1200 F 650 C minimum, followed by air orfurnace cooling to room temperature.6.3 Stress relieving treat
19、ment of the bar material is requiredafter any stretcher, roller, or rotary-straightening or cold-finishing operations performed after heat treatment for me-chanical properties. Local gagging or press straightening tocorrect camber limitations in excess of 1/4 in. in any 5 ft 6 mmin any 1.5 m shall b
20、e followed by a stress relieving heattreatment. The minimum stress relieving temperature shall be100 F 55 C below the minimum tempering temperature asshown in 6.1 for Grades B4B and B4C or in 6.2 for GradeB4D.7. Chemical Composition7.1 Material shall conform to the requirements as to chemi-cal compo
21、sition specified in Table 1.8. Tensile Requirements8.1 Material shall conform to the requirements as to tensileproperties prescribed in Table 2 at room temperature after heattreatment.8.2 The longitudinal axis of the test specimen shall beparallel to the direction of rolling.9. Impact Requirements9.
22、1 Grades B4B, B4C, and B4D shall conform to therequirements as to impact properties prescribed in Table 3 atroom temperature after heat treatment.10. Hardness Tests10.1 Grades B4B, B4C, and B4D shall conform to therequirements as to hardness as prescribed in Table 4 and Table5 at room temperature af
23、ter heat treatment.11. Nuts11.1 When specified by the purchaser, nuts shall be subjectto the impact and tension requirements of this specification.The tests shall be made on test specimens taken from the bar orplate used in the manufacture of the nuts.12. Threads12.1 All threads shall be formed afte
24、r heat treatment.13. Nondestructive Inspection13.1 Each bar or forged blank of starting material shall besubjected to NDE following final heat treatment. The methodused shall be either the Eddy Current (EC), the MagneticParticle (MPI) (wet or dry), the Liquid Penetrant (LPI), theUltrasonic (UT), or
25、the Visual Testing (VT), at the option of theproducer. For LPI or MPI, linear indications (those indicationslonger than116 in. 1.5 mm with a length greater than threetimes their width) are unacceptable. For UT or ET, reject levelsfor linear indications shall be based on the alarm response froma surf
26、ace notch with a maximum depth of 0.012 in. 0.30 mmin a calibration bar. Product being subjected to VT shall bepickled prior to inspection. VT indications longer than18 in.3.2 mm are prohibited.TABLE 1 Chemical RequirementsAElement Grades B4B, B4CBGrade B4DRange, % ProductVariation, %,Over orUnderRa
27、nge, % ProductVariation, %,Over orUnderCarbon 0.200.25 0.02 0.360.44 0.02Manganese 0.501.00 0.03 0.450.70 0.03Phosphorus, max 0.025 0.005 over 0.04 0.005 overSulfur, max 0.025 0.005 over 0.04 0.005 overSilicon 0.200.50 0.05 0.200.35 0.02Nickel 0.501.00 0.03 . .Chromium 11.012.5 0.15 0.801.15 0.05Mol
28、ybdenum 0.901.25 0.05 0.500.65 0.03Vanadium 0.200.30 0.03 0.250.35 0.03Tungsten 0.901.25 0.05 . .Aluminum, maxC0.05 . 0.015 .Titanium, max 0.05 . . .Tin, max 0.04 . . .ASteel to which lead has been added shall not be used.BUNS S42200.CTotal, Soluble + InsolubleTABLE 2 Tensile RequirementsGrade Diame
29、ter, in. mm TensileStrength,min, ksiMPaYieldStrength(0.2 %offset) min,ksi MPaElongationin 2 in. or50 mm,min, %Reductionof Area,min, %B4B . 145 1000 105 720 13 30B4C . 115 790 85 585 18 50B4D 212 65 and under 125 105 18 50860 720over 212 to465to1001107609565517 45over 4 to 7 100 to1801006908558516 45
30、TABLE 3 Impact RequirementsGrade Minimum Impact Value, ftlbf JB4B 10 14B4C 25 34B4DA25 34AFor bars over 5-in. 127-mm diameter only.A437/A437M 10214. Keywords14.1 boltssteel; chromium alloy steel; fastenerssteel;marking on fasteners; nutssteel; stainless steel; steel barsalloy; steel bolting material
31、; temperature serviceapplicationshigh; turbine materialsSUPPLEMENTARY REQUIREMENTSOne or more of the following supplementary requirements shall be applied only when specified bythe purchaser in the inquiry, contract, or order; in which event the specified tests shall be made beforeshipment of the pr
32、oduct.S1. Non-Destructive ExaminationS1.1 NDE is required following all machining and thread-ing. The acceptance criteria of 13.1 shall apply.SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this specification since the last issue,A437/A437M06, that may impact the u
33、se of this specification. (Approved April 1, 2010)(1) Revised title and scope replacing “bolting materials” with“bolting.”(2) Dropped definition for “bolting material” and Table 6because they are covered in Specification A962/A962M.(3) Deleted Notes 1 and 2 as redundant.(4) Added reporting macroetch
34、 test for B4D to Section 4.Reversed the order of Sections 3 and 4.(5) Updated keywords.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of
35、the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Y
36、our comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your commen
37、ts have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or mu
38、ltiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE 4 Hardness Requirements for Bolts and StudsGrade Brinell Hardness Number, maxB4B 331B4C 277B4D 302TABLE 5 Hardness Requirements for Nuts and WashersGrade Brinell Hardness Number Rockwell HardnessNumberB4B 293341 C 3137B4C 229277 C 2129B4D 263311 C 2733A437/A437M 103
