ASTM A437 A437M-2012 Standard Specification for Stainless and Alloy-Steel Turbine-Type Bolting Specially Heat Treated for High-Temperature Service《高温设施用特殊热处理不锈钢和合金钢涡轮式螺栓的标准规格》.pdf
《ASTM A437 A437M-2012 Standard Specification for Stainless and Alloy-Steel Turbine-Type Bolting Specially Heat Treated for High-Temperature Service《高温设施用特殊热处理不锈钢和合金钢涡轮式螺栓的标准规格》.pdf》由会员分享,可在线阅读,更多相关《ASTM A437 A437M-2012 Standard Specification for Stainless and Alloy-Steel Turbine-Type Bolting Specially Heat Treated for High-Temperature Service《高温设施用特殊热处理不锈钢和合金钢涡轮式螺栓的标准规格》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation:A437/A437M11 Designation: A437/A437M 12Standard 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 th
2、e yearof original adoption 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-ste
3、el bolting specially heat treated for high-temperature service, such as steamturbine, gas turbine, and similar uses. See Specification A962/A962M for the definition of bolting. This material requires specialprocessing and should not be used in general-purpose applications. Bolting furnished as bars
4、shall be hot wrought and may befurther processed by centerless grinding or by cold drawing.1.2 The high-temperature properties of the bolting covered by this specification are dependent upon special heat treatment,which is required. Although the high-temperature properties are not specified, they ar
5、e implied by control of the chemistry, heattreatment, and room-temperature properties of the material.1.3 Three levels of bolting strength are covered, designated Grades B4B, B4C, and B4D.1.4 The following referenced general requirements are indispensable for application of this specification: Speci
6、ficationA962/A962M.1.5 Supplementary requirements are provided for use at the option of the purchaser. The supplementary requirements shall applyonly when specified individually by the purchaser in the purchase order or contract.1.6 This specification is expressed in both inch-pound units and in SI
7、units; however, unless the purchase 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 units are to be regarded separately as standard. Within the text, the SI unitsare shown in bra
8、ckets. The values stated in each system may not be exact equivalents; therefore, each system shall be usedindependently of the other. Combining values from the two systems may result in non-conformance with the standard.2. Referenced Documents2.1 ASTM Standards:3A962/A962M Specification for Common R
9、equirements for Bolting Intended for Use atAny Temperature from Cryogenic to theCreep RangeE292 Test Methods for Conducting Time-for-Rupture Notch Tension Tests of MaterialsE112 Test Methods for Determining Average Grain Size3. Ordering Information3.1 It shall be the responsibility of the purchaser
10、to specify all requirements necessary for product under this specification. Suchrequirements to be considered include, but are not limited to, the following:3.1.1 Specification designation, grade, issue date, and revision letter,3.1.2 Quantity (weight or number of pieces),3.1.3 Description (bars, bo
11、lts, nuts, etc.),3.1.4 Dimensions,3.1.5 Finish, and3.1.6 Impact testing of nuts, if required (see Section 98).4. Common Requirements4.1 Bolting supplied to this specification shall conform to the requirements of Specification A962/A962M. These requirements1This specification is under the jurisdictio
12、n of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.22on Steel Forgings and Wrought Fittings for Piping Applications and Bolting Materials for Piping and Special Purpose Applications.Current edition approved Nov.May 1, 2011.2012.
13、Published December 2011.June 2012. Originally approved in 1959. Last previous edition approved in 20102011 asA437/A437M10a.A437/A437M11. DOI: 10.1520/A0437_A0437M-112.2For ASME Boiler and Pressure Vessel Code applications see related Specification SA-437 in Section II of that code.3For referenced AS
14、TM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.1This document is not an ASTM standard and is intended only to provide the us
15、er of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard a
16、s published by ASTM is to be considered the official document.*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.include test methods, finish, thread dimensions, macroetch
17、 (Grade B4D only), marking, certification, optional supplementaryrequirements, and others. Failure to comply with the requirements of Specification A962/A962M constitutes nonconformance withthis specification. In case of conflict between this specification and Specification A962/A962M, this specific
18、ation shall prevail.A437/A437M 1225. Discard5.1A sufficient discard shall be made from each ingot to ensure freedom from injurious piping and undue segregation.6.Heat Treatment6.15.1 Grades B4B and B4C shall be heated to a temperature range of 1875 to 1925 F 1025 to 1050 C and liquid quenchedto belo
19、w 600 F 316 C. The material Grades B4B and B4C shall then be uniformly reheated for tempering at a temperingtemperature at least 100 F 55 C higher than the proposed operating temperature but not less than 1150 F 620 C, then airor furnace cooled to room temperature. The material shall be at the tempe
20、ring temperature for a minimum of 2 h. Double temperingmay be used to enhance properties.6.25.2 Grade B4D shall be heated to a temperature range of 1700 to 1750 F 925 to 954 C and oil quenched. The material shallthen be uniformly reheated or tempered at a temperature of 1200 F 650 C minimum, followe
21、d by air or furnace cooling to roomtemperature.65.3 Stress relieving treatment of the bar material is required after any stretcher, roller, or rotary-straightening or cold-finishingoperations performed after heat treatment for mechanical properties. Local gagging or press straightening to correct ca
22、mberlimitations in excess of 1/4 in. in any 5 ft 6 mm in any 1.5 m shall be followed by a stress relieving heat treatment. The minimumstress relieving temperature shall be 100 F 55 C below the minimum tempering temperature as shown in 6.15.1 for Grades B4Band B4C or in 6.2 5.2 for Grade B4D.7.6. Che
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