Asme Section II a-2 Sa-638 Sa-638m | Heat Treating | Forging

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sa 638 2007
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  2007 SECTION II, PART A SA-638/SA-638M SPECIFICATION FOR PRECIPITATION HARDENINGIRON BASE SUPERALLOY BARS, FORGINGS, ANDFORGING STOCK FOR HIGH-TEMPERATURE SERVICE SA-638/SA-638M [Identical with ASTM Specification A 638/A 638M-00 (R04) except for an editorial correction in 6.2.] 1. Scope1.1  This specification covers hot-finished or cold-fin-ished precipitation hardening iron base superalloy bars,forgings, and forging stock for high-temperature service.The mechanical properties of these alloys are developedby suitable solution treating and precipitation hardeningtreatments. 1.2  Twogradesofironbasealloyarecovered.Selectionwill depend upon design, service conditions, mechanicalproperties, and elevated temperature characteristics. 1.3  The values stated in either inch-pound units or SI(metric) units are to be regarded separately as standards;within the text and tables, the SI units are shown in [brack-ets]. The values stated in each system are not exact equiva-lents; therefore, each system must be used independent of the other. Combining values from the two systems mayresult in nonconformance with the specification. 1.4  Unless the order specifies an “M” designation, thematerial shall be furnished to inch-pound units. 2. Referenced Documents2.1  ASTM Standards: A 484/A 484M Specification for General Requirementsfor Stainless Steel Bars, Billets, and ForgingsA 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel ProductsE 30 Test Methods for Chemical Analysis of Steel, CastIron, Open-Hearth Iron, and Wrought Iron 3. Ordering Information3.1  It is the responsibility of the purchaser to specifyall requirements that are necessary for material ordered 1163 under this specification. Such requirements may include,but are not limited to, the following: 3.1.1  Quantity (weight or number of pieces). 3.1.2  Name of material (precipitation hardening ironbase superalloy). 3.1.3  Form (bars, forgings, and forging stock). 3.1.4  Dimensions (in the case of rough or finishedforgings the order shall be accompanied by a print ordrawing or otherwise adequately described as to the shapeand dimension). 3.1.5  Grade designation (Table 1). 3.1.6  Condition (Section 5). 3.1.7  Finish (Section 3). 3.1.8  Mechanical requirements (Section 8). 3.1.9  ASTM designation. 3.1.10  Special requirements. 4. General Requirements4.1  In addition to the requirements of this specification,all requirements of the current edition of SpecificationA 484/A 484M shall apply. Failure to comply with thegeneral requirements of Specification A 484/A 484M con-stitutes nonconformance with this specification. 5. Condition5.1  The product forms covered in this specificationmay be furnished in one of the following conditions: 5.1.1  Hot-finished. 5.1.2  Solution treated (Grade 660 only — Type 1or Type 2 solution treatment as specified). Copyright ASME International Provided by IHS under license with ASME Licensee=Occidental Chemical Corp New sub account/5910419101 Not for Resale, 08/15/2007 08:02:20 MDT No reproduction or networking permitted without license from IHS --``,``,`,`,``,,``,,,,```,,`,`,-`-`,,`,,`,`,,`---  SA-638/SA-638M 2007 SECTION II, PART A 5.1.3  Solution and precipitation treated (Grade 660only—Type1orType2solutiontreatmentasspecified),or 5.1.4  Other as specified. 6. Heat Treatment6.1  Samples cut from bars, forgings, or a sample forgedfrom the forging stock shall conform to the mechanicalpropertiesofTables1and 2whenheattreatedasprescribedin Table 3. 6.2  When a sample cut from the forging stock and heattreated as prescribed in Table 3 conforms to the propertiesin Tables 1 and 2, it shall be accepted as equivalent to aforged coupon. 7. Chemical Composition7.1  The steel shall conform to the requirements forchemical composition specified in Table 4. 7.2  Methods and practices relating to chemical analysisrequired by this specification shall be in accordance withTest Methods, Practices, and Terminology A 751, exceptthat for remelt material, product analysis tolerances maybe used to determine conformance to this specification. 7.3  For referee purposes, Test Methods E 30 shall beused. 7.4  Methods and practices relating to chemical analysisrequired by this specification shall be in accordance withTestMethods, Practices,and DefinitionsA 751, exceptthatfor remelt material, product analysis tolerances may beused to determine conformance to this specification. 8. Mechanical Properties8.1  The material shall conform to the mechanical prop-erty requirements specified in Table 1 after heat treatmentas described in Table 3. 1164 8.2  The material shall meet the requirements as tostress-rupture properties specified in Table 2 at the testtemperature indicated after heat treatment as described inTable 3. 8.3  When specified in the ordering information (3.1.8),material may be ordered without stress-rupture testing.Material not stress-rupture tested shall be permanentlystamped NR (See Section 10). 9. Metallurgical Properties9.1  When specified, the grain size shall be 1 or finer. 10. Product Marking10.1  Unless otherwise specified on the purchase order,each bundle shall be properly tagged with metal tags show-ing the purchase order number, heat number, name of alloy(orgrade), “NR”whenmaterialhasnotbeenstress-rupturetested,  specification number, and size. 10.1.1  Bars 1 in. [25 mm] and over in diameter, or1 in. [25 mm] and over in thickness between parallel sides,shall be stamped with the heat number,  and if not stress-rupture tested, with the letters “NR”  within approximately2 in. [50 mm] of one end. Smaller sizes shall be boxed orbundled and identified with metal tags as described in 10.1. 10.1.2  Forgings shall be identified as agreed uponbetween the seller and the purchaser. 11. Keywords11.1  precipitation hardening superalloy steel; super-alloy steel bars; superalloy steel billets; superalloy steelforgings; temperature service applications – high Copyright ASME International Provided by IHS under license with ASME Licensee=Occidental Chemical Corp New sub account/5910419101 Not for Resale, 08/15/2007 08:02:20 MDT No reproduction or networking permitted without license from IHS --` `   ,` `   ,`   ,`   ,` `   ,  ,` `   ,  ,  ,  ,` ` `   ,  ,`   ,`   ,-` -`   ,  ,`   ,  ,`   ,`   ,  ,` ---  2007 SECTION II, PART A SA-638/SA-638M TABLE 1MECHANICAL PROPERTY REQUIREMENTS Grade 660 Grade 662 (bars) Grade 662 (forgings) A Heat treatment B  . . . . . . . . . . . . . . . . . solution + precipitation harden solution + precipitation harden solution + precipitation hardenTensile strength, min:psi . . . . . . . . . . . . . . . . . . . . . . . . . . 130 000 130 000 125 000[MPa] . . . . . . . . . . . . . . . . . . . . . . . [895] [895] [860]Yield strength (0.2% offset), min:psi . . . . . . . . . . . . . . . . . . . . . . . . . . 85 000 85 000 80 000[MPa] . . . . . . . . . . . . . . . . . . . . . . . [585] [585] [550]Elongation in 4D min, % . . . . . . . . . . 15 15 15Reduction of area min, %. . . . . . . . . . 18 18 18Brinell hardness. . . . . . . . . . . . . . . . . . 248 min 248 min 248 min A The elongation of tensile specimens machined tangentially from near the center of large disk forgings over 50 in. 2 [320 cm 2 ] in cross sec-tion may be as low as 10%. The reduction of area may be as low as 12%. B  Refer to Table 3 of heat treatment. TABLE 2STRESS-RUPTURE REQUIREMENTS Test Temperature Stress MinimumMinimum Elongation,Grade Heat Treatment A °F [°C] psi [MPa] Hours B  % 660 solution + precipitation harden 1200 [650] 65 000 [450] 23 3662 solution + precipitation harden 1200 [650] 60 000 [415] 15 3 A Refer to Table 2 for details of heat treatment. B  Test specimens meeting minimum requirements may be overloaded to produce rupture in a reasonable and practical time period. 1165 Copyright ASME International Provided by IHS under license with ASME Licensee=Occidental Chemical Corp New sub account/5910419101 Not for Resale, 08/15/2007 08:02:20 MDT No reproduction or networking permitted without license from IHS --``,``,`,`,``,,``,,,,```,,`,`,-`-`,,`,,`,`,,`---  SA-638/SA-638M 2007 SECTION II, PART A TABLE 3HEAT TREATMENT Precipitation HardeningGrade Solution Treatment Treatment A 660 Type 11650 ± 25°F [900 ± 15°C], hold 2 h, oil or 1300 to 1400°F [705 to 760°C], hold 16 h,water quench air cool or furnace cool660 Type 21800 ± 25°F [980 ± 15°C], hold 1 h, oil or 1300 to 1400°F [705 to 760°C], hold 16 h,water quench air cool or furnace cool662 1750 to 1900°F [955 to 1040°C], hold 1 h, 1250 to 1400°F [675 to 760°C], hold 5 h,min, oil or water quench min, slow cooling in 5 h, min to 1200 ±15°F [650 ± 10°C], hold 20 h, min, aircool or furnace cool A Times refer to the minimum time material is required to be at temperature. TABLE 4CHEMICAL REQUIREMENTS Grade 660 (UNS S66286) A Grade 662 (UNS S66220) A Ladle Analysis Check Analysis Over Ladle Analysis Check Analysis OverRange, % or Under Range, % or Under Carbon 0.08 max 0.01 over 0.08 max 0.01 overManganese 2.00 max 0.04 over 1.50 max 0.04Silicon 1.00 max 0.05 over 1.00 max 0.05Phosphorus 0.040 max 0.005 over 0.040 max 0.005 overSulfur 0.030 max 0.005 over 0.030 max 0.005 overChromium 13.50–16.00 0.20 12.00–15.00 0.15Nickel 24.00–27.00 0.20 24.00–28.00 0.20Molybdenum 1.00–1.50 0.05 2.50–3.50 0.10Titanium 1.90–2.35 0.05 1.55–2.00 0.05Copper . . . . . . 0.50 max 0.03 overAluminum 0.35 max 0.05 over 0.35 max 0.05 overVanadium 0.10–0.50 0.03 . . . . . .Boron 0.0010–0.010 0.0004 under 0.0010–0.010 0.0004 under0.001 over 0.001 over A New designation established in accordance with Practice E 527 and SAE J1086. 1166 Copyright ASME International Provided by IHS under license with ASME Licensee=Occidental Chemical Corp New sub account/5910419101 Not for Resale, 08/15/2007 08:02:20 MDT No reproduction or networking permitted without license from IHS
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