1、Designation: A437/A437M 10aStandard 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 adopti
2、on 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 he
3、at 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
4、may 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 Sup
6、plementary 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 pu
7、rchase 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 eac
8、hsystem 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 fo
9、r Use at Any Temperature from Cryo-genic to the Creep RangeE292 Test Methods for Conducting Time-for-RuptureNotch Tension Tests of MaterialsE112 Test Methods for Determining Average Grain Size3. Ordering Information3.1 It shall be the responsibility of the purchaser to specifyall requirements necess
10、ary for product under this specification.Such requirements to be considered include, but are not limitedto, the following:3.1.1 Specification 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,
11、3.1.5 Finish, and3.1.6 Impact testing of nuts, if required (see Section 9).4. Common Requirements4.1 Bolting supplied to this specification shall conform tothe requirements of SpecificationA962/A962M. These require-ments include test methods, finish, thread dimensions, macro-etch (Grade B4D only), m
12、arking, certification, optional supple-mentary requirements, and others. Failure to comply with therequirements of Specification A962/A962M constitutes non-conformance with this specification. In case of conflict be-tween this specification and Specification A962/A962M, thisspecification shall preva
13、il.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.22 on Steel Forgings and Wrought Fittings for Piping Applications and BoltingMaterials for Piping and Special Purpose Applications.Cu
14、rrent edition approved May 1, 2010. Published June 2010. Originallyapproved in 1959. Last previous edition approved in 2010 as A437/A437M10.DOI: 10.1520/A0437_A0437M-10a.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA-437 in Section II of that code.3For reference
15、d 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 website.1*A Summary of Changes section appears at the end of this standard.Copyrigh
16、t ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5. Discard5.1 A sufficient discard 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 tempera
17、turerange 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 uniformly 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 fur
18、nace cooled to room temperature. Thematerial shall be at the tempering temperature for a minimumof 2 h. Double tempering may be used to 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
19、 or tempered at atemperature of 1200 F 650 C minimum, followed by air orfurnace cooling to room temperature.6.3 Stress relieving treatment of the bar material is requiredafter any stretcher, roller, or rotary-straightening or cold-finishing operations performed after heat treatment for me-chanical p
20、roperties. 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 be 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
21、 Grades B4B and B4C or in 6.2 for GradeB4D.7. Chemical Composition7.1 Material shall conform to the requirements as to chemi-cal composition specified in Table 1.8. Tensile Requirements8.1 Material shall conform to the requirements as to tensileproperties prescribed in Table 2 at room temperature af
22、ter heattreatment.8.2 The longitudinal axis of the test specimen shall beparallel to the direction of rolling.9. Impact Requirements9.1 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
23、.1 Grades B4B, B4C, and B4D shall conform to therequirements as to hardness as prescribed in Table 4 and Table5 at room temperature after 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
24、made on test specimens taken from the bar orplate used in the manufacture of the nuts.12. Threads12.1 All threads shall be formed after heat treatment.13. Nondestructive Inspection13.1 Each bar or forged blank of starting material shall besubjected to NDE following final heat treatment. The methodus
25、ed shall be either the Eddy Current (EC), the MagneticParticle (MPI) (wet or dry), the Liquid Penetrant (LPI), theUltrasonic (UT), or 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 three
26、times their width) are unacceptable. For UT or ET, reject levelsfor linear indications shall be based on the alarm response froma surface 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 than
27、18 in.3.2 mm are prohibited.TABLE 1 Chemical RequirementsAElement Grades B4B, B4CBGrade B4DRange, % ProductVariation, %,Over orUnderRange, % 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,
28、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 0.05Molybdenum 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 . .
29、 .ASteel to which lead has been added shall not be used.BUNS S42200.CTotal, Soluble + InsolubleTABLE 2 Tensile RequirementsGrade Diameter, 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 .
30、 115 790 85 585 18 50B4D 212 65 and under 125 105 18 50860 720over 212 to465to1001107609565517 45over 4 to 7 100 to1801006908558516 45TABLE 3 Impact RequirementsGrade Minimum Impact Value, ftlbf JB4B 10 14B4C 25 34B4DA25 34AFor bars over 5-in. 127-mm diameter only.A437/A437M 10a214. Keywords14.1 bol
31、tssteel; chromium alloy steel; fastenerssteel;marking on fasteners; nutssteel; stainless steel; steel barsalloy; steel bolting material; temperature serviceapplicationshigh; turbine materialsSUPPLEMENTARY REQUIREMENTSOne or more of the following supplementary requirements shall be applied only when
32、specified bythe purchaser in the inquiry, contract, or order; in which event the specified tests shall be made beforeshipment of the product.S1. Non-Destructive ExaminationS1.1 NDE is required following all machining and thread-ing. The acceptance criteria of 13.1 shall apply.S2. Stress Rupture Test
33、ingGrade B4BS2.1 Stress rupture testing shall be conducted at 1200 F650 C and 26 000 psi 180 MPa using a combination testbar in accordance with Test Methods E292. Rupture shall occurin the smooth section of each test specimen. The test may bediscontinued after 25 h provided the certification so note
34、s.Stress rupture testing is not required on bars less than12 in.12.7 mm in diameter or thickness.S3. Grain SizeGrades B4B and B4CS3.1 The average grain size shall be 4 or finer. Themaximum size of individual grains, distributed at random, shallbe a 2. When the average grain size is 5 or finer, only
35、theaverage size need be reported. Grain size determination shallbe performed in accordance with Test Methods E112.SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this specification since the last issue,A437/A437M10, that may impact the use of this specification. (A
36、pproved May 1, 2010)(1) Added new Supplementary Requirements S2 and S3.Committee A01 has identified the location of selected changes to this specification since the last issue,A437/A437M06, that may impact the use of this specification. (Approved April 1, 2010)(1) Revised title and scope replacing “
37、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 test for B4D to Section 4.Reversed the order of Sections 3 and 4.(5) Updated keywords.AS
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39、ntirely 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. Your comments are invited either for revision of this standard or for additional standards
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41、 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 multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or
42、 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 10a3
