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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STATUS REPORT ON II?COLOY 800H i

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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 these utodies on Incoloy 60011 and ot her nat trials...

'hermal aging furnaces to carry out 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 of this meno are to discuss coue of the results obtained on Incoloy 800!! at BNL and to j

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; 0.15-0.60% Al and 0.15.60% T1.

Two grades of this alloy are available.

If regular Incoloy -

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 Table 1 which in taken f rom GA A12808-Large li'ICR Steam Cenerator-Vol. 3 generator.

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 for The st.udies at BNL are concent. rated on the Incoloy 800!! because the data base this grade is considerably less than the 800 grade.

For Tucoloy 800, a considerabic in the che.iical aucunt of data is being generated in Europe and in this country for use industiy[o light water reactor applicat.Jons and in LI-!FER applications.'

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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'

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,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.

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

It Frior therno-nechanical history, nuount of cold uork prior to colution annealing, carbon and probably the distribution of Al and Ti in the alloy af fects the teuperaturcq

content, Figure 1 shows a curve..by.i needed for coarsening the grain size to greater t.han AS7H 5.

It J. Orr on the grain coarsening of cold drawn tubing uith various carbon contents.

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

the higher carbon naterial.

Frous this curve, Other heats of has to be above 2100 F (1149"C) to assure a coarse grain naterial.

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.

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

The rupture and creep data of material from the saae heat (HII7427A) studied at BNL,

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solid lines are drawn through the in-air test data points of the coarse grain =ateriay..

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

The the dotted lines uhich represent the ASlig Code Case 1592 expected ninicum for Incoloy All the coarse grained specimens show strength at or above the uinimum specified 3001I.

However, at 1400 F, the flue grain'specinens shou strengths which by the ASME Code.

In terns of-are about 30% lower than the ulnimum anticipated for coarse grain unterial.

the' fine grain raterial shous a reduction of about an order of the time to rupture, ragnitude.

Figure 5 shows that the creep strengths of the fine grained "#E*#I I I8 r

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 in high cycle Some of All of those sp2cinens ucre solution annealed at 2100 F (1149 C).

fatigue.

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

in the naterial.

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 fact that two The first uns in

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

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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

'G e se experience in ntudying Incoloy 300 for gas cooled reactors) ;mre enlightening.

,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.

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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

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! Areas of Concern

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l 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 l

Ca ponent gtag,rfal Te pereture (*f) e e

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Tut e s 1:1-T<-Cr Sr163 Cr 31 t e2J -in and exiton staal 'A-210 Cr A-1 700 (...,a vall) *

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Tote no;part plate

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

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Cartou ute el S A308 C1 2 640 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 1450 (1elow e1.. tar)

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Thervil Inaula-Ni-Te-Cr SD403'Cr'Il 3570 (above rehastar) t ion cover plate Insulation Quarts at Silice, fused

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etlica fitar.us tlantet 1500 f.e '

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)

Tut <=heet ui-To -fr SP403 Cr II 1100 Tube aug urt I n'.'e r N1-Ta {r SECC3 Cr II 2300 5hroud (!nner)

Hi-Te-Cr SECO3 Cr II 1300 Shroud (ootar) 304 55, SA-240 Shrood ineuta-660 tion cover plate Carton uteel t'pper insulatf oa Ture milica 1300 Lower insulatica Taouel, alustna-s'ilica 1000 fibrous binnlot 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)

Evv orator 3 2-1/4 Cr - 1 Mo 5A213, 722 850 (...an wall)

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

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

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Jhalunntion 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 c d 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 l

tubing and piping 2-1/4 Cr - 1 !!o SA-335-r22

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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

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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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Shroud 2-1/2 - 1 !!o SA-3D2-F22 lii-Te-Cr SA-3373 SD-409 Cr. 1 1 Cr - 1/2 !!o Eaffles and 2-1/4 Cr - 1 lb SA-387D cover chects Ni-Te-Cr SD-409 Cr. 1 Ili-Tc-Cr finnte11of K Insulation gacuool Knovool

!!ctatife rtctallic Silica Telt Silir. Telt Frois Fort St. Vrain FSAR e

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