ASTM A823-1999(2003) Standard Specification for Statically Cast Permanent Mold Gray Iron Castings《静铸永久铸模灰铁铸件标准规范》.pdf
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1、Designation: A 823 99 (Reapproved 2003)Standard Specification forStatically Cast Permanent Mold Gray Iron Castings1This standard is issued under the fixed designation A 823; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year
2、of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers gray iron castings that arestatically cast in permanent molds.1.2 No precise quantitativ
3、e relationship can be stated be-tween the properties of the iron in various locations of the samecasting or between the properties of a casting and those of a testspecimen cast from the same iron (see Appendix X1).1.3 The values stated in inch-pound units are to be regardedas the standard.2. Referen
4、ced Documents2.1 ASTM Standards:2A 247 Test Method for Evaluating the Microstructure ofGraphite in Iron CastingsA 644 Terminology Relating to Iron CastingsE 8 Test Methods for Tension Testing of Metallic MaterialsE 10 Test Method for Brinell Hardness of Metallic Materi-als2.2 Federal Standard:Fed. S
5、td. No. 123 Marking for Shipment32.3 Military Standard:MIL-STD-129 Marking for Shipment and Storage33. Terminology3.1 Definitions for many terms common to iron castings arefound in Terminology A 644. A classification of graphitestructure is found in Test Method A 247.4. Classification4.1 Castings or
6、dered and produced under this specificationare classified into a number of grades based on the propertiesof separately cast test bars. The test bar shall be selected on thebasis of the controlling section size of the casting (see 9.1 and9.2 and Table 1).4.2 Castings may be produced in the as cast st
7、ate providedthe requirements of this standard in Table 1 are met. However,annealing or normalizing heat treatments are usual and cus-tomary and are a basis for classification.4.3 The grades are designated A for annealed or N fornormalized. This is followed by an S oraCtodesignate a solidor a cored c
8、asting, followed by an A, B, C, or S to designate thetest bar to be poured with the castings. Examples of properdesignations are as follows:Permanent Mold Castings, ASTM Specification A 823,Grade N-SBPermanent Mold Castings, ASTM Specification A 823,Grade A-CC5. Ordering Information5.1 Orders for ma
9、terial to this specification shall include thefollowing information:5.1.1 ASTM designation number and year of issue.5.1.2 Grade of iron required (see Section 4 and Table 1).5.1.3 The size of the separately cast test bar (letter classifi-cation A, B, C, or S) which best represents the thickness of th
10、econtrolling section of the casting (see 4.1 and Table 2).5.1.4 Location for Brinell Hardness determination (see10.1.1).1This specification is under the jurisdiction of ASTM Committee A04 on IronCastings and is the direct responsibility of Subcommittee A04.01 on Gray IronCastings.Current edition app
11、roved Oct. 10, 1999. Published November 1999. Originallyapproved in 1984. Last previous edition approved in 1999 as A 823 99.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information,
12、refer to the standards Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.TABLE 1 Permanent Mold Gray Iron SpecificationsGrade Tensile Strength, min, ksi(MPa)ABHNUncoredAnnealedA-
13、SA 30 000 (207) 163207A-SB 25 000 (172) 163207A-SC 20 000 (138) 163207A-SS 18 000 (124) 143207CoredAnnealedA-CA 30 000 (207) 143207A-CB 25 000 (172) 143207A-CC 20 000 (138) 143207UncoredNormalizedN-SA 30 000 (207) 170229N-SB 25 000 (172) 170229N-SC 20 000 (138) 170229N-SS 18 000 (124) 149229CoredNor
14、malizedN-CA 30 000 (207) 170229N-CB 25 000 (172) 149229N-CC 20 000 (138) 149229ARefer to Fig. X1.1 for the relationship between tensile strength and sectionsize.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.1.5 Lot size (see Sect
15、ion 16).5.1.6 Special requirements (see Section 17).5.1.7 Special preparation for delivery (see Section 22).5.1.8 Saving tested specimens or unbroken test bars (see19.1.1).6. Chemical Composition6.1 The chemical composition shall be such as to producethe mechanical properties required by this specif
16、ication. As areference, typical compositions covering all grades are shownin Table X1.1 in Appendix X1.6.2 By agreement between the manufacturer and purchaser,chemical composition requirements may be specified.7. Heat Treatment7.1 Although castings may be provided in the as castcondition, when neces
17、sary, heat treatment shall be such as toproduce the mechanical properties required in this standard.8. Tensile Requirements8.1 Test bars representing castings conforming to this speci-fication shall meet the requirements for tensile strength de-scribed in Table 1.9. Cast Test Bars9.1 Test bars shall
18、 be separate castings poured from thesame iron as the castings they represent and shall havedimensions as shown in Table 2. Allowance may be made forreasonable pattern draft within the tolerances shown in Table 2.Test bars A, B, and C are all standard test bars in the form ofsimple cylinders. Test b
19、ar S is special and is intended for usewhere the controlling section of the casting is over 2 in.9.2 The test bar selected shall be based on the controllingsection size of the casting. This shall be determined by thedimensions of the largest cylinder that will fit into the control-ling section of th
20、e casting with the additional requirement thatthe height of the cylinder must be at least equal to its diameter.9.3 The test bars shall be cast in a permanent mold. Themold shall be of similar material, design, and construction asthat used to make the production castings. The test barpermanent mold
21、shall be preheated with three consecutivepours, after which, starting with the fourth pour, the bars can beused for the tension test. A suitable design for a mold is shownin Fig. 1.9.4 By specific agreement between the manufacturer and thepurchaser, test bars removed from the castings may be substi-
22、tuted for separately cast test bars. The location from which thebars are taken shall be as agreed between the parties andindicated on the casting drawing or data base equivalent.TABLE 2 Diameters and Lengths of Cast Test BarsTestBarAs-Cast Diameter, in. (mm)ALength, in. (mm)Nominal(Mid-Length)Minimu
23、m(Bottom)Maximum(Top)Minimum(Specified)Maximum(Recommended)A 0.88 (22.4) 0.85 (21.6) 0.96 (24.4) 5.0 (125) 6.0 (150)B 1.20 (30.5) 1.14 (29.0) 1.32 (33.5) 6.0 (150) 9.0 (230)C 2.00 (50.8) 1.90 (48.3) 2.10 (53.3) 7.0 (175) 10.0 (255)SB. . . . .AThe diameter is the controlling section for the appropria
24、te permanent moldspecification (see Section 9).BAll dimensions of test bar S shall be agreed upon by the manufacturer and thepurchaser.Required Features:1. MaterialPermanent molds.2. PositionBars vertical.3. LSee Table 2.4. DSee Table 2.FIG. 1 Suitable Design and Dimensions for Mold for Separately C
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