ML19263D924

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Status Rept on Incoloy 800H.
ML19263D924
Person / Time
Site: Fort Saint Vrain Xcel Energy icon.png
Issue date: 09/06/1978
From:
PUBLIC SERVICE CO. OF COLORADO
To:
Shared Package
ML19263D922 List:
References
NUDOCS 7904170063
Download: ML19263D924 (12)
v • d • e


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i STATUS REPORT ON II?COLOY 800H

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Septeraber 6,1978 IIICR Safety Division Brookhaven National Laboratory 7 9 0 417 0 0G3 p  :  %% 6 4

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Status Report on Incoloy 8001I Introduction o

Early in the llTCR Safety Program at BNL a review and assecwent of the priuary ,

circuit i.nterials indicated that Incoloy 800!! is one of the materials that would require further study. In particular, studies were required in general metallurgical behavior of the alloy af ter long tern exposure in-!!'ICR helium and long term creep-rupture and fatigue properties in air and in impure helium. A high tenperature testing laboiatory has been established with 20 creep-rupture test unit s, 6 push -pull fatigue units end .-

'hermal aging furnaces to carry out these utodies on Incoloy 60011 and ot her nat trials . ..

that are critical to reactor nafet y. Also, the l'iterial Test Loop (MTL) has been Luftt t.s provide a prototyple ll'lGR helium cavironment for the mechanical tests. 'Ihe purposes

  • j of this meno are to discuss coue of the results obtained on Incoloy 800!! at BNL and to discuss briefly the progress in the developmcat of this alloy for use at temperatures of 1200"F (649oC) and higher.

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, Current Grades of Incoloy 800_ _

Incoloy 800 is an f ron base alloy with 30-35% Ni; 19-23% Cr; 0.10% Ifax. C; 0.15-If regular Incoloy -

0.60% Al and 0.15.60% T1. Two grades of this alloy are available.

l 800 is specified, the naterial supplied uould be in the nill anneated condition whichj <.

is suitabic for use nt teuperatures up to about 1050 F (5660C) for ubich creep defor-( nation is IIaited. For greater creep strength at higher t enperatures, the 11 giade is specified.1he 11 Grade requires that the alloy La nolution annealed to provide an ASDf grain size greater than 5 and the C content to be 0.05% minuaum. Both grades of the alloy are extensively used in the higher temperature components of the llTGR steam generator. Table 1 which in taken f rom GA A12808-Large li'ICR Steam Cenerator-Vol. 3 indicates where the Incolay 800 unterial is used.

Prior to about 1974, the speciff eation for material for high temperature une was

" Grade 11" No restrictions uere made on minit.um carbon level or miniitum grain size.

During this period, uhat is now named Incoloy-800, uas designated " Grade 1".

Tabic 2 uhich is taken from the Fort St. Vrain FSAR, shows that both Grade 1 and Grade II Incoloy 800 were extensively used in the construction of the steam generators for tha t itTER.

11NL Studfes on_Inco.loy_600]l __

The st.udies at BNL are concent. rated on the Incoloy 800!! because the data base for this grade is considerably less than the 800 grade. For Tucoloy 800, a considerabic aucunt of data is being generated in Europe and in this country for use in the che.iical

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, industiy[o light water reactor applicat.Jons and in LI-!FER applications.'

For the IlWR program r ost of the nechanient tests have been on a comnercial heat (filll7427A) uhtch has 0.0S% C; 32.17% Hi; 19'.83% Cr; 0.43% T1; 0.39% Al and the balance in the raos tly Iron. This heat was purchased according to Incoloy 80011 specificat ions foam of inch diameter rods. In an atteupt to obtain a large grain size, all test specimens were given a solution treatuent at 2100 F (1149"C). It uas found that about half of the specimens att ained AST11 grain sizes 3 to 3.5 uhereas the other specimens y' h

St ntos Kgort on Incoloy 60011 2

,have fine grain sizes froa 8 to 8.5. It .ppears that spectuena from the came length A ufullar of bar did not respond equally to grain coarsening at 2100 F (1149 C).

c;-perience uas encountered in solution treating of cnother cou.nercial heat (flill3113A) .

!!aterial from litMil3113A was used to generate some of t.he data in AStiE Code case 1592.

It should be noted that the 80011 a:iterial purchased chould have uet the uinicum AS2M grain size without additional heat treatment.

It is ucil known that grain coaracning of Incolay COOH ~ depends upon many variables.

Frior therno-nechanical history, nuount of cold uork prior to colution annealing, carbon content, and probably the distribution of Al and Ti in the alloy af fects the teuperaturcq needed for coarsening the grain size to greater t.han AS7H 5. Figure 1 shows a curve..by.i It J. Orr on the grain coarsening of cold drawn tubing uith various carbon contents.

ia pointed out that the grain size vs. teqerature curve is very steep, particularly for the higher carbon naterial. Frous this curve, it is obvious that the solution annealing -

has to be above 2100 F (1149"C) to assure a coarse grain naterial. Other heats of Figure 2 and Incoloy 80011 night reasonably be expected to show of nilar behavior.

F.'aure 3 shou cross sections of a tent cpeciuen from IItIDI7427A solution annealed at 21000F (1149 C). Coarse grains were obtained in the center of the specimens but the Reasons for this anomalous grain-grain size remained fine at 'the outer part of the bar.

coarsening behavior are not known. Figures 4 and 5, respectively, present the stress- The ~

rupture and creep data of material from the saae heat (HII7427A) studied at BNL, solid lines are drawn through the in-air test data points of the coarse grain =ateriay..

Also shoun on Figure 4 are, The fine grain raterial data points are indicated by (F.G.).

the dotted lines uhich represent the ASlig Code Case 1592 expected ninicum for Incoloy 3001I. All the coarse grained specimens show strength at or above the uinimum specified by the ASME Code. However, at 1400 F, the flue grain'specinens shou strengthsInwhich terns of-are about 30% lower than the ulnimum anticipated for coarse grain unterial.

the time to rupture, the' fine grain raterial shous a reduction of about an order of ragnitude. Figure 5 shows that the creep strengths of the fine grained r "#E*#I I I8

> about 30% louer than the coarse grained naterial and the raininua creep tate is about tuo orders of magnitude higher. Clearly, the creep otrength of Incolay is extremely dependent on grain size; a significant percentage of small grains will lead to low strength at elevated temperatures.

Specluens uade from heats UHH7427A and HH3113A have also been tested inSome high cycle of fatigue. All of those sp2cinens ucre solution annealed at 2100 F (1149 It C).found 'that was the test specimens vere fine grained and soue were coarse grained.

high cycle fatigue properties up to 1400 F (760 C) vare not noticeably sensitive to graf n size variation within the range of AS1M 3.to 8.

Experience of Other_Investinators It is well known to investigators uho have tested Incoloy 800 or Incoloy 800H that the creep properties are sensitive to grain size and probably to Al and Ti distribution in the naterial. Figure 6 teken from a paper by R. H. Cook, shows the nicro-structure '

of tuo specinens taken from the same bar which was given the saue solution treatrant.

One specinen strained 0.15% in 5543 hours0.0642 days <br />1.54 hours <br />0.00917 weeks <br />0.00211 months <br /> while the other strained 28% in the same According duration. In this case, the grain sizes of the tuo specimens were sf allar.

to the author, this is just one example of property variation in Incoloy 800, at temper-atures of 700 C or higher, uhich could be attributed to local differences in Al and Ti distribution.

1he fuportance and compicxity of Incoloy 800 in reflected in the Thefact firstthat unstwo in

,5tcruational A a e-Ccaferences have been solely devoted to it a study.-sh wrvomitv

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March 1978. c attended t he Pett en Conference and presented two paparn. Discuusions with R.11. Cook of ilmP, R. !!uddle and J. A. P,oard (all have had nany years of experience in ntudying Incoloy 300 for gas cooled reactors) ;mre enlightening. 'G e se

,individualu exprenued concern that properties at temperatures above 7000C can vary no greatly. Itence, they felt that the naterial should not be used in reactor compomato

until it's behavior is better understood.

In sut~naty, several independent studies indicate that in order to neet the ASME

, ninir,um creep properties, precautions oust be taken on the following points:

. - 3 Solut ion annealing at a suf ficiently high temperature to ensure that a concia-- ,

tent.ly large grain size is achieved. It appears that temperatures higher that 21000F (11,490C) are required.

,t l . Cold working effects during fabrication which could induce a small recrystal-liad grain uize during setvice should be ninimized. -

. Compositional ef fects on recrystallization and grain growth should be cyamined *7 wte fully.

I Areas of Concern l

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' Since naterials for the Ft. St. Vrain steam generators were ordered in 1967, it is clear that the ef fects of scall grain sizes on creep strength were Incoupletely quantified. In addit f on, ef fects of inhonogeneities of Al and Ti were not understood.

On these bases, it is believed that It would be of benefit to:

Reevaluate the data base used to design the Ft. St. Vrain steam generators.

. Review the specifications and quality control procedures that were used in the construction of Ft. St. Vrain component s operating at 7000C and higher.

Conduct ndditional stress analyses on these components using a more compre-hensive data base.

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.. .. ( i Table 1 DEFINIT 1on or !!ATERTAI.S USF.D AND PROJECTM) MAXIliUlf OPERNIlNC TDfl'ERA t

  • jfufw Operatins

Ca ponent gtag,rfal Te pereture (*f) l e e f _R. _,1.e a t e_r

- Tut e s 1:1-T<-Cr Sr163 Cr 31 32*O (- an vall) 700 (...,a vall) *

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! t e2J -in and exiton staal 'A-210 Cr A-1 1000 (va,n vell) lead-cmt autas  !!i-T.c- f'r 55163 Cr 11 o .]. '

Tote no;part plate  !!i-T. -Cr SP409 Cr II 1300

~* Tutenbect (hat) ui-Te-Cr 5bt03 Cr II 1160 ,

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Cartou ute el S A308 C1 2 640 Tote shc a t (c old) rioor plate 2-1/4 Cr - 1 Ifa 54-337 Cr D 1050 ,

Shicuds noar

  • 3 cso=sover duct Ni-Te-Cr 55403 Cr II 1570

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Thervil Inaula- Ni-Te-Cr SD403'Cr'Il ,

1450 (1elow e1.. tar) t ion cover plate 3570 (above rehastar)

Insulation Quarts at Silice, fused '~

etlica fitar.us tlantet 1500

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Supe rheater II -

Tutes N1-To-Cr SB163 Cr II 2200 (oenn) 1.c s J -o u t tutre 1:1-Tc-Cr 5L163 Cr II 2200 (oean) ui-To -fr SP403 Cr II 1100 Tut <=heet Tube aug urt N1-Ta {r SECC3 Cr II 2300 I n'.'e r Hi-Te-Cr SECO3 Cr II 1300 5hroud (!nner)

Shroud (ootar) 304 55, SA-240 Shrood ineuta- 660 tion cover plate Carton uteel 1300

. t'pper insulatf oa Ture milica Lower insulatica Taouel, alustna-s'ilica fibrous binnlot 1000 Tcene f re r-Pvapor at or supetheater i Tutes Supanheiter I 2-1/4 Cr - 1 l'.o SA213, 722 2000 (..c an v.11)

Ivapos at ur 11 2-1/4 Cr - 1 1:a 1.A213, 722 900 ( c an al'1) 2-1/4 Cr - 1 Mo 5A213, 722 850 (...an wall)

Evv orator 3 Tc onomi s er II 2-1/4 Cr - 1 Mo SA213, 722 700 (rean wall)

Troncmt ser I 2-1/4 Cr - 1 Ho 5A213, T22 650 (-ean vall) -

Tconoe.tner lead-

  • 300 in tutes 2 -1/ 4 C r - 1 t'.o 5 A 213',' T 2 2 Toh eupport 1300 plate Mi-Te-Cr Sc407 Cr II 300 Tubcsheet Carbon nt,ect SASOS C1 2 Frotl CA412008 -- Ibrae 5I'[GR Steac1 Generat.or Volume 3

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Table 2 8- STFM r.LNERATOX JiATERI AI.S 1

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  • Sertion }{n t e r in ! Jhalunntion Pr ess urc Pa rt s Ibin etcan/ water Carbon Stect SA-230-A3 tubing r.nd piping C - 1/2 !!o SA-182-FI .

and associated corponents C - Si SA-442-60 ,-

1 Cr - 0.2 1!o SA-193-37 cd .*, . .

2-1/4 Cr - 1 !!o SA-232-F22 2-1/4 Cr - 1 lb SA-213-722 7" 1/2 Cr -. i/2 Ifo SA-213-72 .

lii-Tc-Cr SD-403 Cr. 1 & 2

li-Tc-Cr 53-163 Cr. 1 & 2

. Ili-Te -Cr SD-507 Cr. 1 D reheater secara 1-1/4 Cr - 1/2 tb SA-335-r13

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l tubing and piping 2-1/4 Cr - 1 !!o SA-335-r22 and associated coeponents 2-1/4 Cr - 1 fio SA-JB2-F22 fli-Tc-Cr SB-408 Cr. 1 & 2 .

Ili-Tc-Cr '55-409 Cr. 2 /.,' . '

Ili-Te-Cr SD-407 Cr. '

. fli-Tc-Cr SD-363 Cr. 2 Hajor Support liain ntram/ water 2-1/4 Cr - 1 Ifo SA-337D .

Structures sections lii-Tc-Cr SD-409 Cr. 2 Rcheat sections lii-Tc-Cr 50-409 Cr. 2 I Tricary closure 2-1/4 Cr - 1 lb SA-JB2-T22 lii-Tc-Cr SD-408 Cr. 1 Secondary closure 2-1/4 Cr - 1 Mo SA- 3 8 2- T22 rii-Te-Cr SD-408 Cr. 1 C - 1/2 :fo SA-382-T1 C - 1/2 Mo SA-204B

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SD-409 Cr. 1 1 Cr - 1/2 !!o SA-3373 Eaffles and 2-1/4 Cr - 1 lb SA-387D cover chects Ni-Te-Cr SD-409 Cr. 1 Ili-Tc-Cr ,

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