1、Designation: A844/A844M 09 (Reapproved 2015)Standard Specification forSteel Plates, 9 % Nickel Alloy, for Pressure Vessels,Produced by the Direct-Quenching Process1This standard is issued under the fixed designation A844/A844M; the number immediately following the designation indicates the yearof or
2、iginal 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. Scope1.1 This specification covers 9 % nickel-alloy steel platesproduc
3、ed by the direct-quenching process. The plates areintended primarily for use in welded pressure vessels.1.2 The direct-quenching process consists of quenching theplates directly after rolling, without permitting the plates tocool below the critical temperature prior to initiation of thequenching ope
4、ration, and subsequently tempering the plates.(This differs from the “conventional” process in which theplates are permitted to cool to a temperature significantlybelow the critical temperature, usually to ambient temperature,prior to reheating to a temperature above the upper criticaltemperature, t
5、hen quenching, and subsequently tempering.)1.3 The maximum nominal thickness of plates furnishedunder this specification shall not exceed 2 in. 50 mm.1.4 This material is susceptible to magnetization. Use ofmagnets in handling after heat treatment should be avoided ifresidual magnetism would be detr
6、imental to subsequent fabri-cation or service.1.5 The values stated in either inch-pound or SI units are tobe regarded separately as standard. Within the text, the SI unitsare shown in brackets. The values stated in each system are notexact equivalents; therefore each system must be used inde-penden
7、tly of the other. Combining values from the two systemsmay result in nonconformance with the specification.2. Referenced Documents2.1 ASTM Standards:2A20/A20M Specification for General Requirements for SteelPlates for Pressure VesselsA435/A435M Specification for Straight-Beam UltrasonicExamination o
8、f Steel PlatesA577/A577M Specification for Ultrasonic Angle-Beam Ex-amination of Steel PlatesA578/A578M Specification for Straight-Beam UltrasonicExamination of Rolled Steel Plates for Special Applica-tions3. General Requirements and Ordering Information3.1 Material supplied to this material specifi
9、cation shallconform to Specification A20/A20M. These requirements out-line the testing and retesting methods and procedures, permit-ted variations in dimensions, quality and repair of defects,marking, loading, and ordering information.3.2 In addition to the basic requirements of thisspecification, c
10、ertain supplementary requirements are availablewhen additional control, testing, or examination is required tomeet end use requirements. The purchaser is referred to thelisted supplementary requirements in this specification and tothe detailed requirements in Specification A20/A20M.3.3 If the requir
11、ements of this specification are in conflictwith the requirements of Specification A20/A20M, the require-ments of this specification shall prevail.4. Manufacture4.1 Steelmaking PracticeThe steel shall be killed andshall conform to the fine austenitic grain size requirement ofSpecification A20/A20M.4
12、.2 Heat Treatment:4.2.1 The plates shall be quenched directly after rolling,without being allowed to cool below 1205F 650C. Thequenching shall be initiated from a temperature within therange from 1205 to 1670F 650 to 910C. (The temperatureshall be reported in accordance with 19.2 of SpecificationA20
13、/A20M.)4.2.2 Subsequent to quenching, the plates shall be temperedwithin the range from 1050 to 1175F 565 to 635C, holdingat that temperature for a minimum of 30 min/in. 1.2 min/mmof thickness but for not less than 15 min., and then cooling ata rate of not less than 300F/h 165C/h, either in air or b
14、yquenching in water, to ambient temperature.4.2.2.1 Prior to the tempering treatment, the plates may besubjected to an intermediate heat treatment consisting of1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibi
15、lity of SubcommitteeA01.11 on Steel Plates for Boilers and Pressure Vessels.Current edition approved Sept. 1, 2015. Published September 2015. Originallyapproved in 1985. Last previous edition approved in 2009 as A844/A844M 09.DOI: 10.1520/A0844_A0844M-09R15.2For referenced ASTM standards, visit the
16、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.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. Uni
17、ted States1heating to a temperature in the range from 1165 to 1290F 630to 700C, holding at that temperature for a minimum of 1 h/in.(2.4 min/mm of thickness, but in no case less than 15 min, andthen water-quenching to below 300F 150C in the case ofplate thicknesses of more than58 in. 16 mm or coolin
18、g in airor water-quenching to below 300F 150C in the case of platethicknesses of58 in. 16 mm and under.NOTE 1The intermediate heat treatment is for the purpose ofenhancing elongation and notch-toughness and for reducing susceptibilityto strain-aging embrittlement and temper embrittlement. It may bep
19、erformed at the option of the material manufacturer or may be specifiedby the purchaser.5. Chemical Composition5.1 The steel shall conform to the chemical requirementsshown in Table 1 unless otherwise modified in accordance withSupplementary Requirement S17, Vacuum Carbon-DeoxidizedSteel, in Specifi
20、cation A20/A20M.6. Finish6.1 The plates shall be descaled by the producer prior toshipment.7. Mechanical Requirements7.1 Tension Test RequirementsThe material as representedby the tension-test specimens shall conform to the require-ments specified in Table 2.7.1.1 For nominal plate thicknesses of34
21、in. 20 mm andunder, the 112-in. 40-mm wide rectangular specimen may beused for the tension test and the elongation may be determinedin a 2-in. 50-mm gage length that includes the fracture andshows the greatest elongation.7.2 Impact Test Requirements:7.2.1 Charpy V-notch impact tests shall be made in
22、 accor-dance with Specification A20/A20M.7.2.2 Number and Location of Test CouponsTwo impacttests shall be made from each plate-as-heat-treated, with thetest coupons being taken from locations adjacent to the tensiontest coupons.7.2.3 OrientationThe longitudinal axis of the test speci-men shall be t
23、ransverse to the final rolling direction of theplate.7.2.4 Test TemperatureUnless otherwise specified on theorder, the tests shall be conducted at 320F 195C.7.2.5 Acceptance CriteriaEach test specimen shall have alateral expansion opposite the notch of not less than 0.015 in.0.381 mm.8. Marking8.1 I
24、n addition to the marking required in SpecificationA20/A20M, each plate shall be legibly stamped or stenciled,depending upon the ordered thickness, with the letters DQTexcept as otherwise specified in 8.1.1.8.1.1 When the optional heat treatment permitted in 4.2.2 isperformed, the plates shall be ma
25、rked with the letters DQTTinstead of DQT.9. Keywords9.1 alloy steel; alloy steel plate; pressure containing parts;pressure vessel steels; steel plates; steel plates for pressurevessel applicationsSUPPLEMENTARY REQUIREMENTSSupplementary requirements shall not apply unless specified in the order.A lis
26、t of standard supplementary requirements, for use at the option of the purchaser, are includedin Specification A20/A20M. Several of those that are considered to be suitable for use with thisspecification are listed below by title. Other tests may be performed by agreement between thesupplier and the
27、 purchaser.S1. Vacuum Treatment,S2. Product Analysis,S6. Drop Weight Test (for Material 0.625 in. 16 mm andOver in Thickness),S8. Ultrasonic Examination in Accordance with Specifica-tion A435/A435M,S11. Ultrasonic Examination in Accordance with Specifica-tion A577/A577M,S12. Ultrasonic Examination i
28、n Accordance with Specifica-tion A578/A578M,S13. NDT Temperature Determination,S17. Vacuum Carbon-Deoxidized Steel,TABLE 1 Chemical RequirementsElement Composition, %Carbon, maxA0.13Manganese, max:Heat analysis 0.90Product analysis 0.98Phosphorus, maxA0.015Sulfur, maxA0.015Silicon:Heat analysis 0.15
29、0.40BProduct analysis 0.130.45BNickel:Heat analysis 8.509.50Product analysis 8.409.60AApplies to both heat and product analyses.BThe specified minimum limit does not apply if the total aluminum content is0.030 % or more, or provided that acid soluble aluminum is 0.025 % or more.TABLE 2 Tensile Requi
30、rementsTensile strength, ksi MPa 100 to 120 690 to 825Yield strength, min, ksi MPa 85 585Elongation in 2 in. 50 mm, min, %A20.0ASee Specification A20/A20M for elongation adjustments.A844/A844M 09 (2015)2S18. Unspecified Elements, and S19. Restricted Chemical Requirements.ADDITIONAL SUPPLEMENTARY REQ
31、UIREMENTSAlso listed are additional optional Supplementary Requirements S55 and S56 which are suitable forthis specification:S55. Longitudinal Charpy Impact Energy Absorption Re-quirementS55.1 The longitudinal Charpy V-notch impact propertiesshall not be less than 25 ftlbf 34 J at the test temperatu
32、respecified in the order.S55.2 Each impact test value shall constitute the averagevalue of three specimens, with not more than one individualspecimen value below the specified minimum value of 25 ftlbf34 J but in no case below 20 ftlbf 27 J for full-sizespecimens.S56. Transverse Charpy Impact Energy
33、 Absorption Re-quirementS56.1 The transverse Charpy V-notch impact propertiesshall not be less than 20 ftlbf 27 J at the test temperaturespecified in the order.S56.2 Each impact test value shall constitute the averagevalue of three specimens, with not more than one individualspecimen value below the
34、 specified minimum average value of20 ftlbf 27 J but in no case below 15 ftlbf 20 J for full-sizespecimens.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 th
35、at determination of 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 reappr
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37、eel that your comments 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 re
38、prints (single or multiple 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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 09 (2015)3
