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ASTM A1095 - 15.pdf

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ASTM A1095 - 15.pdf

Designation A1095 − 15Standard Specification forHigh-Silicon Molybdenum Ferritic Iron Castings1This standard is issued under the fixed designation A1095; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers castings made of high-siliconmolybdenum ferritic iron, commonly known as SiMo. Thisspecification includes castings with microstructures of spheroi-dal graphite SG SiMo iron, compacted graphite CG SiMoiron, and mixed graphite or medium-nodularity graphite MGSiMo iron. MG iron microstructure comprises a mixture ofspheroidal and compacted graphite shapes. This standardspecifies the condition, chemical composition, microstructure,and other technical requirements of three grades of ferritic castirons, specified as SG SiMo, MG SiMo, and CG SiMo.1.2 No precise quantitative relationship can be stated be-tween the properties of iron in the various locations of the samecasting or between the properties of castings and those of a testspecimen cast from the same iron.1.3 The values stated in SI units are to be regarded asstandard. All chemical compositions are in mass percentage.No other units of measurement are included in this standard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards2A247 Test Method for Evaluating the Microstructure ofGraphite in Iron CastingsA395 Specification for Ferritic Ductile Iron Pressure-Retaining Castings for Use at Elevated TemperaturesA476/A476M Specification for Ductile Iron Castings forPaper Mill Dryer RollsA536 Specification for Ductile Iron CastingsA834 Specification for Common Requirements for IronCastings for General Industrial UseA842 Specification for Compacted Graphite Iron CastingsA897/A897M Specification for Austempered Ductile IronCastingsD1976 Test Method for Elements in Water by Inductively-Coupled Argon Plasma Atomic Emission SpectroscopyD5381 Guide for X-Ray Fluorescence XRF Spectroscopyof Pigments and ExtendersE8/E8M Test Methods for Tension Testing of Metallic Ma-terialsE10 Test Method for Brinell Hardness of Metallic MaterialsE21 Test Methods for Elevated Temperature Tension Tests ofMetallic MaterialsE228 Test Method for Linear Thermal Expansion of SolidMaterials With a Push-Rod DilatometerE351 Test Methods for Chemical Analysis of Cast IronAllTypesE1184 Practice for Determination of Elements by GraphiteFurnace Atomic Absorption SpectrometryE1999 Test Method for Analysis of Cast Iron by SparkAtomic Emission Spectrometry2.2 SAE Society of Automotive Engineers InternationalStandardsJ434 Automotive Ductile Nodular Iron CastingsJ1887 Automotive Compacted Graphite Iron CastingsJ2582 Automotive Ductile Iron Castings for High Tempera-ture Applications2.3 Federal StandardFED-STD-123 Marking for Shipment Civil Agencies2.4 American National StandardMIL-STD-129 Military Marking for Shipment and Storage2.5 Other PublicationsAFS American Foundry Society, Foundrymen’s Guide toDuctile Iron Microstructures, 1984AFS, Iron Castings Engineering Handbook, 2004ASM Specialty Handbook, Cast Irons, 1999ASM Specialty Handbook, Heat-Resistant Materials, 1999ASM Handbook, Casting, Volume 15, 19983. Ordering Information3.1 Orders for materials to this specification shall includethe following information3.1.1 ASTM designation and year of issue,1This test method is under the jurisdiction of ASTM Committee A04 on IronCastings and is the direct responsibility of Subcommittee A04.02 on Malleable andDuctile Iron Castings.Current edition approved Nov. 1, 2015. Published December 2015. DOI10.1520/A1095-152For referenced 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 standard’s Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.1.2 Grade of silicon-molybdenum ferritic iron required,3.1.3 Chemical composition requirements see Section 5,3.1.4 Microstructure and mechanical requirements see Sec-tions 6 and 7,3.1.5 Drawing and test coupon criteria see Section 8,3.1.6 Special requirements, if desired see Sections 9 and11,3.1.7 Certification if so designated by purchaser see Sec-tion 12, and3.1.8 Special preparation for delivery, if required see Sec-tion 14.4. Materials and Manufacture4.1 The manufacturer shall produce high-silicon molybde-num iron castings with a microstructure consisting of apredominantly ferritic matrix in the as-cast condition. Smallamounts of flake graphite in the surface reaction zone areallowed only when agreed between the manufacturer andpurchaser.4.2 High-silicon ferritic SiMo iron castings are typicallysupplied in the as-cast condition. If heat treatment is agreedbetween the manufacturer and purchaser, castings can be eitherfully or subcritically annealed. The recommended heat treat-ment practice is provided in Appendix X3.5. Chemical Composition5.1 Chemical requirements for each grade are specified inTable 1. Chemical composition shall be determined fromchilled disk samples or samples representative of the castingsand in accordance with the applicable sections of Test MethodsD1976, E351, and E1999, Practice E1184, and Guide D5381.5.2 When agreed between the manufacturer and purchaser,chemistry control ranges may be tighter than those specified inTable 1.5.3 Controlling the carbon equivalent is important toachieve uniform graphite distribution and to minimize solidi-fication shrinkage and graphite flotation. The carbon equivalentcontrol range shall be established by the manufacturer toproduce castings that meet the chemical composition ranges inTable 1, the microstructure requirements in Section 6, and themechanical properties in Table 2.5.4 Chromium can improve heat resistance of SiMo ironcastings. Annealing heat treatments should be utilized if Crcontent exceeds 0.10 .5.5 The total concentrations of alloy elements includingMo, Mn, Ni, Cu, W, V, Nb, and Cr shall not exceed 2.5 .5.6 The lower limit of phosphorus for SG SiMo iron isspecified to eliminate the brittleness at medium temperature ofapproximately 425C.6. Microstructure6.1 The matrix requirements for the three grades of SiMoirons are the same predominantly ferritic, a maximum 5 primary carbides, and adjacent to the cell boundaries, amaximum 30 Mo-rich precipitates.6.2 All the three grades of SiMo iron castings for whichchemical composition is specified in Table 1 shall be substan-tially free of flake, exploded, chunky, crab, spiky, and floata-tion graphite. Flake graphite is permitted in the surface reactionzone to a maximum depth of 0.30 mm for sections ≤10 mm andto a maximum depth of 0.60 mm for sections 10 mm.6.3 For SG SiMo iron, the graphite in the microstructureshall consist of a minimum 80 Type I and Type II graphiteaccording to Test Method A247.6.4 For CG SiMo iron, the graphite in the microstructureshall consist of a minimum 60 Type IV graphite; theremaining graphite shall be a combined maximum 40 TypeI, Type II, and Type III graphite according to Test MethodA247 and Specification A842.6.5 For MG SiMo iron, the graphite in the microstructureshall consist of a minimum 40 of Type I and Type II graphiteaccording to Test Method A247 and a range of 30 to 60 TypeIV graphite according to Test Method A247 and SpecificationA842.6.6 The volume fraction of graphite is typically in the rangeof 8 to 14 . Graphite structure evaluations using imageanalysis should only be done by agreement between themanufacturer and purchaser.TABLE 1 Chemical Composition RequirementsTypeSG SiMo MG SiMo CG SiMoElement Composition mass Carbon 2.90–3.70 2.80–3.60 2.70–3.50Silicon 3.50–4.80 3.50–4.80 3.50–4.80Molybdenum 0.40–1.50 0.40–1.50 0.40–1.50Titanium 0.05 max 0.10 max 0.25 maxMagnesium 0.06 max 0.05 max 0.04 maxManganese 0.50 max 0.50 max 0.50 maxNickel 0.50 max 0.50 max 0.50 maxCopper 0.30 max 0.30 max 0.30 maxTungsten 0.30 max 0.30 max 0.30 maxVanadium 0.10 max 0.10 max 0.10 maxNiobium 0.30 max 0.30 max 0.30 maxChromium 0.50 max 0.50 max 0.50 maxPhosphorus 0.02–0.05 0.05 max 0.05 maxSulfur 0.02 max 0.02 max 0.02 maxIron balance balance balanceTABLE 2 Tensile and Hardness RequirementsTestingTemperatureGrade SG SiMo MG SiMo CG SiMoTensilestrength, min,MPa500 450 400Yield strength,min, MPa420 400 350RoomtempertureElongation in25 mm or50 mm, min,6.0 4.0 1.5Brinellhardness,HBW190–270 190–270 190–270A1095 − 1527. Mechanical Properties7.1 Tensile testing specimens shall be taken from separatelycast coupons unless otherwise agreed between the manufac-turer and purchaser. Brinell hardness testing specimens may betest coupons or castings or both see Section 8.7.2 The iron as represented by the test specimens shallconform to the requirements in Table 2 for tensile propertiesand hardness at room temperature. The tensile testing shallproceed in accordance with Test Methods E8/E8M for roomtemperature and Test Method E21 for elevated temperature. Ifthe test results fail to conform to the requirements, two retestsshall be performed with specimens removed from test couponsor castings produced using the same casting conditions. Ifeither retest fails to meet the specification requirements, thecastings represented by these test specimens shall be subject torejection.7.3 Yield strength shall be determined using the 0.2 offsetmethod in accordance with Test Methods E8/E8M. Brinellhardness shall be determined in accordance with Test MethodE10.7.4 The tensile properties at 425C are listed in Table 3 forreference nonmandatory information to monitor the possiblebrittleness at medium temperature. The medium temperature isdefined in the range of 350 to 500C.8. Test Coupons8.1 Test coupons for microstructure determination and me-chanical properties testing may be separately cast or attached tocastings. Separately cast test coupons shall be poured from thesame iron as the castings they represent. This means the samechemical composition, the same inoculation practice, and anequivalent cooling rate. The details of test coupons includingcoupon type, size, location, sampling methods and othercoupon-related control plans shall be agreed between themanufacturer and purchaser.8.2 The type of metallographic specimen used shall beagreed between the manufacturer and purchaser. Three types ofmetallographic specimens may be used 1 separately castcoupons, 2 a test lug cast with castings or attached to thepouring basin or cup, and 3 specimens cut from castings.8.3 Separately cast test coupons shall be Y-blocks, keelblocks, or modified keel blocks in accordance with Specifica-tions A395, A476/A476M, A536, A842, and A897/A897M.8.3.1 The bottom Y-block thickness shall be 13 mm forcasting thickness 38 mm.8.3.2 Leg thickness of keel blocks shall be 25 mm forcasting thickness 13 to 38 mm. For other casting thickness, thekeel block thickness shall be changed according to 8.3.1.8.3.3 Modified keel blocks of 25 mm bar diameter can besubstituted for the 25-mm Y-block or the 25-mm keel block.8.3.4 The coupon molds shall have a thickness equal orgreater than the coupon thickness. The coupons shall be left inthe mold until they have cooled to a black color ≤500C.8.3.5 If the test bars show obvious defects, additional barsshall be cut from other test blocks representing the same iron.8.4 When castings made in accordance with this specifica-tion are produced by spheroidization directly in the mold, themanufacturer may use either separately cast test coupons or testspecimens cut from castings. When separately cast test cou-pons are used, selection shall be according to 8.1. If test barsare to be cut from castings, test bar location shall be agreedbetween the manufacturer and purchaser and shall be indicatedon the casting drawing or model.9. Additional Tests9.1 In addition to the chemical, microstructure and me-chanical requirements in Sections 5–7, other special tests suchas nondestructive testing radiographic soundness, liquid pen-etrant examination, magnetic particle inspection, leakage test-ing may be agreed between the manufacturer and purchaser.Refer to Specification A834 for a list of common requirementsfor iron castings not specifically referenced elsewhere in thisspecification.10. Workmanship, Finish, and Appearance10.1 The castings shall be free of injurious defects. Surfaceof the castings shall be free of burnt-on sand and shall bereasonably smooth. Runners, risers, and other cast-on piecesshall be removed. In other respects, the castings shall conformto whatever points may be specifically agreed upon betweenthe manufacturer and the purchaser.10.2 No repairing by plugging or welding of any kind shallbe permitted unless written permission is granted by thepurchaser.11. Inspection and Quality11.1 At the time of an order, the purchaser should establishan agreement for quality and inspection requirements with themanufacturer.11.2 Unless otherwise specified in contract or purchaseorder, the manufacturer shall be responsible for carrying out allthe tests and inspections required by this specification. Thepurchaser reserves the right to perform any of the inspectionsset forth in the specification where such inspections are deemednecessary to assure supplies and services conform to theprescribed requirements.12. Certification12.1 When specified in the purchase order or contract, themanufacturer’s or supplier’s certification shall be furnished toTABLE 3 Tensile Properties at 425C for ReferencesTestingTemperatureGrade SG SiMo MG SiMo CG SiMoTensilestrength,min, MPa400 380 360425C Yieldstrength,min, MPa340 320 300Elongationin 25 mm or50 mm, min,5.0 4.0 1.5A1095 − 153the purchaser stating that samples representing castings havebeen manufactured, tested, and inspected in accordance withthis specification and that the requirements have been met.When specified in the purchase order or contract, a report ofthe test results shall be furnished.13. Product Marking13.1 When the size of the casting permits, each casting shallbear the cast date, the part or pattern number, and theidentifying mark of the manufacturer. The cast date may becoded. The cast date, identifying mark of the manufacturer, andthe part or pattern number shall be at a location shown on thecasting drawing or model, or if not shown on the drawing ormodel, at a location selected at the discretion of the manufac-turer.14. Packaging and Package Marking14.1 Unless otherwise s

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