A638A638M-10 Standard Specification for Precipitation Hardening Iron Base Superalloy Bars, Forgings, And Forging Stock for High-Temperature Service

Designation: A638/A638M −  10

Standard Specification for

Precipitation Hardening Iron Base Superalloy Bars, Forgings, and Forging Stock for High-Temperature Service 1 This standard is issued under the fixed designation A638/A638M; the number immediately following the designation indicates the year of original 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. Sco Scope* pe*

Unified Numbering System (UNS) 2

1.1 This specification specification covers hot-finished or cold-finished precipitation hardening iron base superalloy bars, forgings, and forging forg ing stock for highhigh-temper temperature ature service. The mechan mechanical ical properties of these alloys are developed by suitable solution treating treatin g and precip precipitation itation hardening treatments.

3. Orde Ordering ring Informatio Information n 3.1 It is the responsi responsibili bility ty of the pur purcha chaser ser to spe specify cify all requirementss that are necessa requirement necessary ry for material ordered under this specifi spe cificati cation. on. Suc Such h req requir uireme ements nts may inc includ lude, e, but are not limited to, the following: 3.1.1 Quant Quantity ity (weight or number of pieces), pieces), 3.1.2 Name of materia materiall (preci (precipitatio pitation n harde hardening ning iron base superalloy), 3.1.3 Form (bars, forgings, forgings, and forging stock), 3.1.4 Dimens Dimensions ions (in the case of rough or finish finished ed forgings forgings thee or th orde derr sh shall all be acc accom ompa pani nied ed by a pr prin intt or dr draw awin ing g or otherwise adequately described as to the shape and dimension), 3.1.5 Grade designatio designation n (Table ( Table 1), 1), 3.1.6 Condi Condition tion (Section (Section 5), 3.1.7 Finish (Section (Section 3), 3.1.8 Mechan Mechanical ical requirements requirements (Sectio (Section n 8), 3.1.9 ASTM designation, designation, and 3.1.10 3.1.1 0 Special requirements. requirements.

1.2 Two grades of iron base alloy are covered. Selection will depend upon design, service conditions, mechanical properties, and elevated temperature charac characteristic teristics. s. 1.3 1. 3 Th Thee va valu lues es st state ated d in ei eith ther er in inch ch-p -pou ound nd un units its or SI (metric) units are to be regarded separately as standards; within the text and tables, the SI units are shown in [brackets]. The values stated in each system are not exact equivalents; therefore fo re,, ea each ch sy syst stem em mu must st be us used ed in inde depe pend nden entt of th thee ot othe herr. Combining values from the two systems may result in nonconformance with the specification. 1.4 1. 4 Un Unle less ss th thee or orde derr sp spec ecifi ifies es an “M “M”” de desi sign gnati ation on,, th thee material shall be furnished to inch-pound units. 2. Referen Referenced ced Documents Documents

4. General Requirements Requirements

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2.1   ASTM Standards: A484/A484M Specifi Specification cation for Gener General al Requir Requirements ements for Stainless Steel Bars, Billets, and Forgings A751 Test A751  Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products E30 Tes E30  Testt Methods for Chemical Analys Analysis is of Steel, Cast Iron, Open-Hearth Iron, and Wrought Iron  (Withdrawn 1995) 4 E527 Pr Pract actice ice fo forr Nu Numb mber erin ing g Me Meta tals ls an and d Al Allo loys ys in th thee

4.1 In addition to the requirements requirements of this specification, specification, all requireme requir ements nts of the cur curren rentt edi editio tion n of Spe Specifi cificati cation on   A484/  A484M   shal shalll ap appl ply y. Fai Failu lure re to co comp mply ly wi with th th thee ge gene nera rall requirement requi rementss of Specifi Specification cation A484/A484M  A484/A484M  constitut  constitutes es nonconformanc confo rmancee with this specifi specification. cation. 5. Condi Condition tion 5.1 The product product forms covered in this specification specification may be furnished in one of the following conditions: 5.1.1 Hot-fi Hot-finished nished,, 5.1.2 Soluti Solution on treated (Grade 660 only—Type only—Type 1 or Type Type 2 solution treatment as specified), 5.1.3 Soluti Solution on and precipitation precipitation treated (Grade 660 only— Type 1 or Type 2 solution treatment as specified), or 5.1.4 Other as specified. specified.

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This specification is under the jurisdiction of ASTM Committee  A01  A01 on  on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.17 on A01.17  on Flat-Rolled and Wrought Stainless Steel. Curren Cur rentt edi editio tion n app approv roved ed Apr April il 1, 201 2010. 0. Pub Publis lished hed Apr April il 201 2010. 0. Ori Origin ginall ally y approved in 1970. Last previous edition approved in 2004 as A638/A638M – 00 (2004). DOI: 10.1520/A0638_A0638M-10. 2 For ASME Boile Boilerr and Pres Pressure sure Vessel Vessel Code appli application cationss see relat related ed Speci Specifification SA-638 in Section II of that Code. 3 For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [email protected]. For  Annual Book of ASTM  Standards volume information, refer to the standard’s Document Summary page on the ASTM website. 4 The last app approve roved d vers version ion of this historica historicall sta standa ndard rd is ref refere erence nced d on www.astm.org.

6. Heat Treatme Treatment nt 6.1 Sam Sample pless cut from bar bars, s, for forgin gings, gs, or a sam sample ple for forged ged from fr om th thee fo forg rgin ing g st stoc ock k sh shall all co conf nfor orm m to th thee me mech chan anic ical al properties prop erties of  of    Tabl Tablee 1 and   Tabl Tablee 2   when when he heat at tre treat ated ed as prescribed in Table in  Table 3. 3.

*A Summary of Changes section appears at the end of this standard Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States

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A638/A638M − 10 TABLE 1 Mechanical Property Requirements

Heat treatmentB  Tensile strength, min: ps i [M P a ] Yield strength (0.2 % offset), min: ps i [M P a ] E l o n g a t i o n i n 4 D m i n, % Reduction of area min, % Brinell hardness

Grade 660

Grade 662 (bars)

Grade 662 (forgings)A

solution + precipitation harden

solution + precipitation harden

solution + precipitation harden

13 0 00 0 [8 9 5 ]

1 3 0 00 0 [ 89 5 ]

1 25 00 0 [8 6 0 ]

85 0 00 [5 8 5 ] 15 18 24 8 m i n

85 000 [ 58 5 ] 15 18 248 mi n

80 000 [5 5 0 ] 15 18 24 8 m i n

A

The elongation of tensile specimens machined tangentially from near the center of large disk forgings over 50 in.2 [320 cm2] in cross section may be as low as 10 %. The reduction of area may be as low as 12 %. B  Refer to  to   Table 3  3  of heat treatment.

TABLE 2 Stress-Rupture Requirements A

Grade

66 0 66 2 A B 

Heat Treatment

solution + precipitation harden solution + precipitation harden

Tes estt Tem empe pera ratu ture re °F

[°C]

ps i

[ M P a]

1 20 0 1 20 0

[ 65 0] [ 65 0]

6 5 00 0 6 0 00 0

[4 5 0 ] [4 1 5 ]

Minimum HoursB 

Minimum Elongation, %

23 15

3 3

Refer to  to   Table 3 for 3 for details of heat treatment. Test specimens meeting minimum requirements requirements may be overloaded to produc produce e ruptur rupture e in a reason reasonable able and practi practical cal time period period..

TABLE 3 Heat Treatment Grade

Solution Treatment

66 0

Type 1 1650 ± 25 1650 25°F °F [9 [900 00 ± 15 15°C °C], ], hold ho ld 2 hr hr,, oi oill or wa wate terr q ue n c h

1300 to 14 1300 1400 00°F °F [7 [705 05 to 760° 76 0°C] C],, ho hold ld 16 h, ai airr co cool ol or furnace cool

Type 2 1800 ± 25 1800 25°F °F [9 [980 80 ± 15 15°C °C], ], hold ho ld 1 h, oi oill or wa wate terr q ue n c h

1300 to 14 1300 1400 00°F °F [7 [705 05 to 760° 76 0°C] C],, ho hold ld 16 h, ai airr co cool ol or furnace cool

66 0

66 2

A

Appl Ap plie ied d St Stre ress ss Du Duri ring ng St Stre ress ss-Rupture Testing

6.2 Wh 6.2 When en a sa samp mple le cu cutt fr from om th thee fo forg rgin ing g st stoc ock k an and d he heat at treated as prescribed in Table in  Table 2 conforms 2  conforms to the properties in Tables 3 and 4, 4 ,   it shall be accepted as equivalent to a forged coupon.

Precipitation Hardening TreatmentA

1750 to 1900°F [955 to 1040°C 104 0°C]] hold hold 1 h, min min,, oil oil or water quench

7. Chem Chemical ical Compositio Composition n 7.1 The steel shall conform conform to the requirements requirements for chemical composition compo sition specified in in Table  Table 4. 4. 7.2 Methods Methods and pra practic ctices es rel relatin ating g to che chemica micall ana analys lysis is required by this specification shall be in accordance with Test Methods, Metho ds, Practic Practices, es, and Termino erminology logy   A751, A751,   except that for remelt rem elt mat materia erial, l, pro produc ductt ana analys lysis is tole toleran rances ces may be use used d to determine conformance to this specification.

1 2 5 0 t o 1 4 0 0 °F [ 6 7 5 t o 760°C] 760 °C],, hold hold 5 h, h, min, min, slo slow w c o o l i n g i n 5 h , m i n to 1 2 0 0 ± 15°F [650 ± 10°C], hold 20 h, min, air cool or furnace cool

7.3 For referee purposes, purposes, Test Methods Methods E30 E30 shall  shall be used.

Times refer to the minimum time material is required to be at temperature.

TABLE 4 Chemical Requirements Grade 660 (UNS S 66286)A

Carbon M an g an es e Si l i c on Phosphorus S u l fu r Chromium Nickel M ol y bd en um Titanium Copper A l u m i n um Vanadium Boron A

Grade 662 (UNS S 66220)A

Ladle Analysis Range, %

Check Analysis Over or Under

Ladle Analysis Range, %

Check Analysis Over or Under

0.08 max 2.00 max 1.00 max 0 .0 4 0 m a x 0. 03 0 m a x 1 3 . 5 0 – 1 6 .0 0 2 4 .0 0 – 2 7 . 0 0 1. 00 – 1. 50 1 .9 0 – 2 .3 5 .. . 0.35 max 0 .1 0 – 0 . 5 0 0 .0 0 1 0 – 0 .0 1 0

0. 01 o v er 0 .0 4 o v e r 0. 05 o v er 0 .0 0 5 o v e r 0 .0 0 5 o v e r 0. 20 0 .2 0 0 .0 5 0 .0 5 . .. 0 .0 5 o v e r 0. 03 0 .0 0 0 4 u n d e r 0 .0 0 1 o v e r

0 .0 8 m a x 1 .5 0 m a x 1 .0 0 m a x 0 .0 4 0 m a x 0 .0 3 0 m a x 1 2 . 0 0 – 1 5 .0 0 2 4 .0 0 – 2 8 . 0 0 2 .5 0 – 3 .5 0 1 .5 5 – 2 . 0 0 0 .5 0 m a x 0 .3 5 m a x ... 0 .0 0 1 0 – 0 .0 1 0

0 .0 1 o v e r 0 .0 4 0 .0 5 0 .0 0 5 o v e r 0 .0 0 5 o v e r 0 .1 5 0. 20 0 .1 0 0. 05 0 .0 3 o v e r 0 .0 5 o v e r . .. 0 .0 0 0 4 u n d e r 0. 00 1 ov e r

New designation established in accordance with Practice E527 Practice E527 and  and SAE J 1086.

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A638/A638M − 10 7.4 Methods Methods and pra practic ctices es rela relatin ting g to che chemic mical al ana analys lysis is required by this specification shall be in accordance with Test Methods, Method s, Practic Practices, es, and Definit Definitions ions   A751, A751,   excep exceptt th that at fo forr remelt material, product analysis tolerances may be used to determine conformance to this specification.

10. Pro Product duct Marking Marking 10.1 Unless otherwise otherwise specified specified on the purchase purchase order, order, each bundle shall be properly tagged with metal tags showing the purchase order number, heat number, name of alloy (or grade), “NR” “N R” wh when en ma mater teria iall ha hass no nott be been en st stre ress ss-r -rup uptu turre tes teste ted  d , specification number, and size.

8. Mechanical Proper Properties ties

10.1.1 Bars 1 in. [25 mm] and over in diameter 10.1.1 diameter,, or 1 in. [25 mm] and ove overr in thi thickn ckness ess between between par paralle allell sid sides, es, sha shall ll be stamped with the heat number,  and if not stress-rupture tested, with the letters “NR”  within approximately 2 in. [50 mm] of  one end. Smaller sizes shall be boxed or bundled and identified with metal tags as described in 10.1 in  10.1..

8.1 The material shall conform conform to the mechanical mechanical property requir req uireme ements nts spe specifie cified d in   Table Table 1   aft after er he heat at tr treat eatme ment nt as described in Table in  Table 3. 3. 8.2 The material material shall meet the req requir uireme ements nts as to stre stressssrupture properties specified in  Table 2 at 2  at the test temperature indicated after heat treatment as described in  Table 3. 3.

10.1.2 Forg 10.1.2 Forgings ings shall be identified as agreed upon between the seller and the purchaser.

8.3 Wh 8.3 When en sp spec ecifi ified ed in th thee or orde derin ring g in info form rmati ation on ( 3.1.8 3.1.8), ), material may be ordered without stress-rupture testing. Material not stress-rupture tested shall be permanently stamped NR (See Section 10 10)).

11. Keywords 11.1 precipitation 11.1 precipitation harde hardening ning super superalloy alloy steel; super superalloy alloy steel bars; super superalloy alloy steel billets billets;; super superalloy alloy steel forg forgings; ings; temperature service applications—high

9. Metallurgi Metallurgical cal Properties Properties 9.1 When specified, specified, the grain size shall be 1 or finer. finer.

SUMMARY OF CHANGES Committ Comm ittee ee A0 A01 1 ha hass id iden entifi tified ed th thee lo loca catio tion n of se selec lected ted ch chan ange gess to th this is st stan anda dard rd sin since ce th thee la last st iss issue ue (A638/A638M – 00 (2004)) that may impact the use of this standard. (Approved April 1, 2010.) (1)  Revised column heading in Table 2. ASTM International International takes no positi position on respecting the validi validity ty of any patent rights assert asserted ed in connec connection tion with any item mentio mentioned  ned  in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk  of 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 and  if not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standards  and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the  responsible respon sible technical technical committee, which you may attend. If you feel that your comments have not receiv received ed a fair hearing you should  make 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 reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the above  address addr ess or at 610610-832832-9585 9585 (pho (phone), ne), 610610-832832-9555 9555 (fax (fax), ), or serv service@ ice@astm astm.org .org (e-m (e-mail) ail);; or thro through ugh the ASTM webs website  ite  (www.astm. (www .astm.org). org). Permission Permission rights to photocopy the standa standard rd may also be secure secured d from the ASTM website (www.astm.or (www.astm.org/  g/  COPYRIGHT/).

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