1、Designation: A858/A858M 10aA858/A858M 13Standard Specification forHeat-Treated Carbon Steel Fittings for Low-Temperature andCorrosive Service1This standard is issued under the fixed designation A858/A858M; the number immediately following the designation indicates the yearof original adoption or, in
2、 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 specification covers heat-treated wrought carbon steel piping fittings with l
3、owered carbon content of seamless andelectric fusion-welded construction covered by the latest revisions inASME B16.9,ASME B16.11, MSS SP-75, MSS SP-79, MSSSP-83, MSS SP-95, or MSS SP-97. Fittings differing from these ASME and MSS standards shall be furnished in accordance withSupplementary Requirem
4、ent S58 of Specification A960/A960M. These fittings are for use in pressure components where inherentnotch toughness and optimum sulfide-cracking resistance are required, such as oil and gas industry piping and distribution systems.1.2 Optional supplementary requirements are provided for fittings wh
5、en a greater degree of examination is desired. One or moreof the supplementary requirements may be specified in the order.1.3 This specification does not cover cast-welding fittings or fittings machined from castings.1.4 The values stated in either SI units or inch-pound units are to be regarded sep
6、arately as standard. Within the text, the SI unitsare shown in brackets. 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. Unless theoth
7、er specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.2. Referenced Documents2.1 In addition to those reference documents listed in Specification A960/A960M, the following list of standards apply to thisspecification.2.2 ASTM Standa
8、rds:2A960/A960M Specification for Common Requirements for Wrought Steel Piping Fittings2.3 ASME Standards:3B16.9 Steel Butt-Welding FittingsB16.11 Forged Steel Fittings, Socket Welding and Threaded2.4 MSS Standards:4MSS SP-25 The Standard Marking System of Valves, Fittings, Flanges and UnionsMSS SP-
9、75 Specification for High Test Wrought Butt-Welding FittingsMSS SP-79 Socket Welding Reducer InsertsMSS SP-83 Steel Pipe Unions, Socket-Welding and ThreadedMSS SP-95 Swage(d) Nipples and Bull PlugsMSS SP-97 Integrally Reinforced Forged Branch Outlet FittingsSocket Welding, Threaded and Buttwelding E
10、nds2.5 ASME Boiler and Pressure Vessel Code:Section V Nondestructive Examination5Section VIII Division 1, Pressure Vessels51 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.22on Steel F
11、orgings and Wrought Fittings for Piping Applications and Bolting Materials for Piping and Special Purpose Applications.Current edition approved Nov. 1, 2010Oct. 1, 2013. Published December 2010October 2013. Originally approved in 1986. Last previous edition approved in 2010 asA858/A858M10.10a. DOI:
12、10.1520/A0858_A0858M-10a.10.1520/A0858_A0858M-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Available
13、from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.org.4 Available from Manufacturers Standardization Society of the Valve and Fittings Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http:/www.mss-
14、.5 Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001, http:/www.sae.org.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
15、it 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 as published by ASTM is to be considered the official document.*A Summary of Changes section appears
16、at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1Section IX Welding and Brazing Qualifications2.6 American Society of Nondestructive Testing:6SNT-TC-1A Recommended Practice for Nondestructive Testing Personne
17、l Qualification and Certification3. Ordering Information3.1 In addition to the requirements of Specification A960/A960M, the following ordering information applies: requirements forcertification of the test report.4. General Requirements4.1 Products furnished to this specification shall conform to t
18、he requirements of Specification A960/A960M, including anysupplementary requirements that are indicated in the purchase order. Failure to comply with the general requirements ofSpecification A960/A960M constitutes nonconformance with this specification. In case of conflict between the requirements o
19、f thisspecification and Specification A960/A960M, this specification shall prevail.5. Materials5.1 The material for fittings shall be fully killed fine-grain material made by a melting process that is intended to producerounded, well dispersed, fine sulfide inclusions, that promote good notch toughn
20、ess, assists in the resistance to hydrogen inducedcracking, and for weldability suitable for field-welding.5.2 Starting materials shall consist of plate, sheet, forgings, forging quality bar and seamless or fusion welded tubular productswith filler metal added. The chemical composition shall conform
21、 to Table 1.5.3 Astarting material that specifically requires the addition of any element beyond those listed in Table 1 is not permitted. Thisdoes not preclude the use of deoxidizers.5.4 Starting materials shall not require a preheat for field welding provided that the restrictions of ASME Boiler a
22、nd PressureVessel Code, Section VIII, Paragraph UW-30 are complied with.6. Manufacture6.1 Forging or shaping operations may be performed by hammering, pressing, piercing, extruding, upsetting, rolling, bending,fusion welding, machining, or by a combination of these operations.6.2 All welds including
23、 welds in tubular products from which the fittings are made shall be:6.2.1 Made by welders, welding operators, and welding procedures qualified under the provisions of ASME Boiler and PressureVessel Code, Section IX,6.2.2 Heat treated in accordance with Section 7 of this specification, and6.2.3 Radi
24、ographically examined throughout the entire length of each weld in accordance withArticles 1 and 2 of ASME Boilerand Pressure Vessel Code, Section V with the acceptance limits in accordance with Paragraph UW-51 in Section VIII of that samecode.6.3 The welded joints of the fittings shall be furnished
25、 in accordance with the requirements of Paragraph UW-35(a) of ASMEBoiler and Pressure Vessel Code, Section VIII.6 Available from American Society for Nondestructive Testing (ASNT), P.O. Box 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http:/www.asnt.org.TABLE 1 Chemical RequirementsCompositio
26、n %Heat AnalysisCarbon 0.20Manganese 0.901.35 All values arePhosphorus 0.030 maximum unless aSulfur 0.010 range is shownSilicon 0.150.40ANickel 0.50BChromium 0.30BMolybdenum 0.20BCopper 0.35BA When vacuum carbon deoxidation is used, the silicon shall be 0.10 % maximum,and on product analysis shall n
27、ot exceed 0.12 %.B The combined total of nickel, chromium, molybdenum, and copper shall notexceed 1.0 %.A858/A858M 1326.4 All butt-weld tees manufactured by cold-forming methods shall be liquid-penetrant or magnetic-particle examined by oneof the methods specified in Specification A960/A960M. This e
28、xamination shall be performed in accordance with a writtenprocedure and shall be performed after final heat treatment. Only the side wall area of the tees need be examined. This area isdefined by a circle that covers the area from the weld bevel of the branch outlet to the center line of the body or
29、 run. Internal andexternal surfaces shall be examined when size permits accessibility. No cracks shall be permitted. Other imperfections shall betreated in accordance with Section 14 on finish. After the removal of any crack, the tees shall be re-examined by the originalmethod. Acceptable tees shall
30、 be marked with the symbol PT or MT, as applicable, to indicate compliance. NDE personnel shallbe qualified in accordance with SNT-TC-1A.6.5 All caps machined from bar stock shall be examined by liquid penetrant or magnetic particle in accordance withSupplementary Requirement S69 or S70 with personn
31、el qualifications, acceptance criteria and marking as in 5.4.7. Heat Treatment7.1 All fittings shall be furnished in the heat-treated condition. Fittings formed above the transformation temperature or uponwhich welding is performed, shall be cooled to below the lower criteria temperature prior to he
32、at treatment. Fittings shallsubsequently be heat treated by normalizing, quenching, and tempering or stress-relieving in accordance with SpecificationA960/A960M.8. Chemical Composition Requirements8.1 The chemical composition of the steel shall conform to the requirements prescribed in Table 1.8.2 T
33、he steel shall not contain any unspecified elements for the ordered grade to the extent that it conforms to the requirementsof another grade for which that element is a specified element having a required minimum content.8.3 An analysis of each heat of steel shall be made from a sample taken prefera
34、bly during the pouring of the heat. The resultsshall conform to Table 1.8.4 The fittings manufacturer shall make a product analysis per heat from either the starting material or from a fitting inaccordance with Specification A960/A960M.8.5 Weld metal used in the construction of the fittings shall co
35、nform to the tensile and impact requirements of 9.4 and 11.1 afterheat treatment in accordance with Section 7.Achemical analysis shall be performed on deposited weld metal for each heat of fillermetal or, for submerged arc welding, each heat of filler metal and batch of flux. The weld metal shall be
36、 deposited in accordancewith the qualified weld procedure.8.6 Only the carbon content of the deposited weld-metal composition need comply with the requirements of Table 1. The totalnickel content of the deposited weld metal shall not exceed 1.0 %.9. Tensile Requirements9.1 The tensile properties of
37、the fitting material shall conform to the requirements listed in Table 2.9.2 Tension test specimens shall be taken from a fitting after final heat treatment or from a test piece of the same heat andnominal thickness that was heat-treated in a charge with the fittings it represents.9.3 One tensile te
38、st is required for each heat of fittings of the same section thickness and heat treated in either a continuous-or batch-type furnace, controlled within a range of 50 F 28 C and equipped with recording pyrometers.9.4 In addition, fittings containing welds shall have one center-weld tension test made
39、with the axis transverse to the weld seamfor each heat of filler metal, or each heat of filler metal and batch of flux for submerged arc welds, for fittings of the same sectionthickness and heat treated in either a continuous or batch-type furnace controlled within a range of 50 F 28 C and equippedw
40、ith recording pyrometers. Only the ultimate tensile strength need meet the minimum requirements of Table 2.10. Hardness Requirements10.1 Fittings shall have a maximum hardness of 22 HRC (235 HBW).11. Notch Toughness Properties11.1 The notch toughness properties of the fittings shall conform to the r
41、equirements listed in Table 2. The testing shall beperformed as specified in Specification A960/A960M. Full-size Charpy, V-notch, Type A specimens shall be used wheneverpossible. Small size specimens shall be used only when the material thickness does not permit full size specimens. The impactspecim
42、ens shall not be flattened after heat treatment. All base metal specimens shall be removed with the axis of the specimenslongitudinal to the direction of primary metal flow. Weld metal specimens shall have the axis transverse to the weld seam.11.2 One set of impact tests (three specimens) shall be m
43、ade to represent the base metal and one set of impact tests (threespecimens) shall be made to represent the weld metal on the same frequency as the tension tests.A858/A858M 13311.3 The test temperature shall be 50 F 46 C.12. Dimensions12.1 Dimensional requirements for NPS 14 and smaller fittings are
44、 provided byASME B16.9, B16.11, MSS SP-79, MSS SP-83,MSS SP-95, or MSS SP-97.12.2 Dimensional requirements for fittings larger than NPS 14 up through NPS 48 are provided in MSS SP-75, except asmodified by 12.312.3 Fittings of a size or shape differing from the standards in 12.1 and 12.2 but meeting
45、all the other requirements of thisspecification, may be furnished in accordance with Supplementary Requirement S58 of Specification A960/A960M.13. Finish and Appearance13.1 See Specification A960/A960M for specific requirements.14. Repair by Welding (Base Metal)14.1 Repair welding, by the manufactur
46、er, is permissible in accordance with Specification A960/A960M and the following:14.1.1 The deposited weld metal shall conform to the requirements of 8.5 and 8.6. Electrodes for the shielded metal-arc processshall be of the low-hydrogen type.14.1.2 Sections thicker than 1 in. 25 mm shall also be rad
47、iographed after repair welding in accordance with 6.2.14.1.3 All fittings repaired by welding shall be thermally treated after repair by either complete reheat treatment or post-weldheat treatment at least 50 F 28 C below the tempering temperature if tempering has been performed.14.1.4 Indications d
48、iscovered by nondestructive examination shall, after heat treatment, be again examined by the same NDEmethod as used in the original determination.14.1.5 Personnel performing NDE examinations shall be qualified in accordance with SNT-TC-1A.15. Hydrostatic Test15.1 Hydrostatic testing is not required
49、 by this specification.TABLE 2 Mechanical RequirementsYield strength, min, 0.2 % offset, ksi MPa 36 250Tensile strength, min, ksi MPa 70 485-95 655Elongation:Standard round specimen, or small-sizeproportional specimen, min, % in 4D22Rectangular specimen, for section thickness516 in. 7.94 mm and over, and for smallsizes tested in full section; min, % in 2 in.50 mm.30Rectangular specimen for section thicknessless than 516 in. 7.94 mm; min, % in2 in. 50 mm.Width of specimen 112 in. 40 mm.AReduction of area (round specimen only
