mechanical testing of steam generator support bolts

9

810910 8201200608 0 305 PDR ADOCK PDR P

TECHNICAL REPORT TR-5160-1

MECHANICAL TESTING OF STEAM GENERATOR SUPPORT BOLTS

AUGUST 11, 1981

SoTELEDYNE ENGINEERING SERVICES

303 BEAR HILL ROAD 'AIALTHAM, MASSACHUSETTS 02154

617-890-3350

AweTELEDYNE

Technical Report ENGINEERING SERVICES TR-5160-1 -1

Teledyne Engineering Services (TES) has, at the request of Wisconsin

Public Service Company (WPSC) performed tensile, impact, and hardness

tests on two steam generator support bolts. This report presents the

results of this testing.

WPSC supplied TES with two bolts from steam generator supports from

their Kewaunee plant. The bolts are made of a material identified as

Vascomax 250 CVM, a high strength maraging steel supplied by Teledyne

Vasco. Both bolts are shown in Figures 1 and 2. The threads on the longer

bolt were stripped during removal of the bolt from the steam generator in

the plant. The bolts had been installed with Heli-Coils.

The bolts were sectioned as shown by the drawings in Attachment 1 to

provide four full size charpy and four sub-size tensile specimens from the

long bolt, and two full size charpy, and two sub-size tensile specimens

from the short bolt. Also in Attachment 1 are the detail drawings for the

specimens.

These bolts were parts of original installation and had been tested

previously as a part of material certification. These results are shown in

Table 1.

The results of TES's tests are shown in Tables 2 and 3. In Table 4,

the TES results are presented along with values previously reported in the

material certification, and results expected based on Teledyne Vasco's

literature. There are two columns for the Teledyne Vasco literature: the

first column is from literature approximately from the period when the

bolts were obtained, the second the most recent Teledyne Vasco literature

on the same material. Copies of TES test reports are included as Attach

ment 2, and copies of the relevant sections of the Teledyne Vasco litera

ture are in Attachment 3.

K.TELEDYNE Technical Report ENGINEERING SERVICES TR-5160-1 -2

The results obtained by TES are in agreement with values reported in

the Teledyne Vasco literature. The results are also in agreement with the

material certifications except TES found lower charpy impact values.

The original material certification charpy tests and TES's confirma

tion charpy tests were performed at 400F. At the request of WPSC, one charpy test was performed at 700F. The result at 70oF was consistant with the 400F tests as expected from the Teledyne Vasco literature which shows

the charpy impact energy-temperature curve to be flat at these temperatures.

TES considered the environment in which these bolts were placed, and

the metallurgy of this material. We can find no factor that could cause a reduction in the charpy impact values. Since the TES results are in agreement with the Teledyne Vasco literature, it is our opinion that the

original material certification charpy results are questionable. It is also our opinion that there has been no deterioration in the mechanical properties of these bolts.

Technical Report TR-5160-1 -3-

Figure 1

PHOTOGRAPHS OF THE TWO STEAM GENERATOR SUPPORT BOLTS AS RECEIVED BY TES

Figure 2

0 WTEL.EDYNE

EraEERNGSERVICES


'WNTELEDYNE ENGINEERING SERVICES

Table 1

Mechanical Properties Reported in Material Certifications

Order No.V312695* V312693*

Tensile Strength (ksi) 250.0 251.0 Yield Strength (0.2 percent'

offset) (ksi) 24.3 245.9 Reduction in Area (percent) 62.4 62.0 Elongation (percent) 11.5 12.0 Hardness (HRC) 48.8 49.3 Charpy V-Notch 38.5 41.6

Impact Energy 35.3 37.1 46.2 44.7 Foot/Pounds 37.4 46.4

*Aging time three hours at 9000 F


-oTELEINNE ENGINEERING SERVICES

Table 2

Mechanical Test Results for Steam Generator Support Bolts

Property

Tensile Strength Yield Strength Reduction In Elongation Hardness

Specimen (ksi) (ksi) Area (Percent) (Percent) (Average)

Long Bolt L2 254.7 244.2 59.0 11.8

L4 256.2 244.8 58.9 12.2

L5 253.8 242.4 59.9 11.1

L7 255.6 243.6 60.4 12.9

L8 -- -- -- 49.9

Short Bolt S1 269.1 261.0 59.0 10.8

S3 269.8 261.6 59.2 10.5 51.7

WOW T


S0 TELEDYNE ENGINEERING SERVICES

Table 3

Charpy Test Results for Steam Generator Support Bolts

* Performed at request of WPSC to determine temperature effect on impact energy.

t Data lost.

Technical Report TR-5160-1

Comparison of

-7-

Table 4

TES Results with TDY Vasco Material Certification Results (Table 1) and TDY Vasco Literature

V I I

TES Results (Average)

Material Certificates (Table 1) Average

TDY Vasco Literature - 1981

TDY Vasco Literature - 1972

Tensile Strength (ksi) 259.7 250.5 260 - -260

Yield Strength (ksi) (0.2 percent offset) 249.6 244.6 -250 -250

Reduction in Area (Percent) 59.4 63.2 - 58 - 61

Elongation (Percent) 11.6 11.8 15 - 15

Hardness (HRC) 50.8 49.1 50 51

Charpy V-Notch Impact Energy 20 (Ft/Lbs) 25.9 37.1, - 20

44.7

SNTEL.EDYNE ENGINEERING SERVICES

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ENGINEERING SERVICES

ATTACHMENT 1

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C/RAPPY IMcACT TEST 5pEC/4.6vN LA/v< (A-5567)

MA TERIA L : VA SC OMAX 250 cvm

HARDNESS //RC 50

NOTE5:EACH SPE-cMC/EN To AAVE 1.D. .5/60L. J0 LUS ,2,ETC. AS 5PEC/-/ED fY TeS.

PROJ. MGRAnrq_ DATE64 8 / ISSUEDlR BY r' DC (f0PY NA

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REVISIONS

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CHARPY IMPACT TEST 5PEC/MEIN BLAWvK(A-5587)

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ATTACHMENT 2

TES TEST RESULTS

BYGNEER:NG SERVICES Page 1 of

Rockwell Hardness Test

Performed By: -w:0--- )Date: Scales Used:

Project:

Calibration Block:

1

Serial # C-/7-27?

Hardness tLy Q + ,

Calibration Block Test Results:

2 3

Results

(Show sketch of part tested when appropriate)

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Rockwell Hardness Test Results

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Client wisconsin ruouli atrvoL=

Date 23 June 1981 Project 5160

Type and Condition of Material Steel

Test Temperature. RT Strain Rate _ Load Rate

Engineer or Crosshead Rate Technician TJD Approved

Final Diameter or Specimen Number L2 Thickness (Inches) 0.160

Diameter or Final Width (Inches)

Thickness (Inches) 0.2507 . Final Area (Inches2 0.0201062

Width (Inches) Reduction of Area (Inches ) 0.0493627 Area (Percent) 59

Initial Gage Ultimate Strength (psi) 254700

Length (Inches) 1 Yield Strength (psi) 244200

Final Gage Modulus (Psi) 26 x 10 Length (Inches) 1.118

Elongation (Percent) 11.8

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Client Wisconsin Public Service


Typp and Condition of Material Steel

Test Temperature RT Strain Rate Load Rate

Engineer or Crosshead Rate Technician Approved

Final Diameter or

Specimen Number L4 Thickness (Inches) 0.159


Thickness (Inches) 0.248 Final Area (Inches2 0.0198557

Width (Inches) Reduction of

Area (Inches2 ) 0.0483051 Area (Percent) 58.9

Initial Gage Ultimate Strength (psi) 256.2 x 103

Length (Inches) 1 Yield Strength (psi) 244.8 x 103

Final Gage Modulus27.3 x 106

Length (Inches) 1.122


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Final Diameter or

Specimen Number L5 Thickness (Inches)


Thickness (Inches) 0.248 Final Area (Inches )_ 0.0193593


Area (Inches2) 0.0483051 Area (Percent)

Initial Gage Ultimate Strength (psi) 253.8 x


Final Gage Modulus (Psi) 27.6 x 106

Length (Inches) 1.Mu6


Equipment Used

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Date 26 June 1981


Project 5160


Engineer or Crosshead Rate 0.060 in/min Technician TJD Approved

Final Diameter or Specimen Number L7 Thickness (Inches)


Thickness (Inches) 0.248Final Area (Inches2 Width (Inches) Reduction of

Area (Inches2) 0.0483051 Area (Percent) 60.4

Initial Gage Ultimate Strength (psi) 255.6 x 103


Final Gage Modulus (psi) 28.8 x 106 Length (Inches) 1.129


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Tensile Test Report


Date 23 June 1981


Test Temperature RT Strain R

Project 5160

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Engineer orCrosshead Rate Technician Approved

Final Diameter or Specimen Number S2 Thickness (Inches) 0.160


Thickness (Inches) 0.2506 Final Area (Inches2) 0.0201062

Width (Inches) Reduction of Area (Inches

2 ) 0.0493233 Area (Percent) 59

Initial Gage Ultimate Strength (psi) 269100 Length (Inches) 1 Yield Strength (psi) 261000

Final Gage 106 Length (Inches) 1.108 M.odulus (psi) 28 x


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Engineer or Crosshead Rate Technician Approved

Final Diameter or Specimen Number S4 Thickness (Inches) 0.159


Thickness (Inches) 0.249 Final Area (Inches2) 0.0198557


Area (Inches2) 0.0486955 Area (Percent) 59.2

Initial Gage Ultimate Strength (psi)


Final Gage Modulus (psi)

Length (Inches) 1.105


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ATTACHMENT 3

RELEVANT SECTIONS OF TELEDYNE VASCO LITERATURE, 1972 AND 1981

ENGINEERING SERVICES

'. asc6Max,200 VM' C).7VascoM ax2,50OVM .Vasco*.Max 30 0VM

-1 Ku . . .. VascoMax35

I' ... .. ..

.N7

LARBPENYVN>.55

240

220

200

180

160

-Y 140

120

100

80

60

o 40

2090

104 105 106 107 108 60 Cycles

FIGURE 6. R.R. Moore rotating beam fatigue tests on production bar C stock of VascoMax 250 VM. All samples annealed at 1500*F. for 30

30 minutes, air cooled and aged at 900* F. for 3 hours.

0 5 10 15

Age Time Hours

20 25

FIGURE 5. Effect of Aging Time at 9000F. on the Tensile Properties of VascoMax 250. Specimens solution annealed for 1 hour at 15000F., air cooled and aged at 900*F. for the times indicated.

All ,.ta pertains to bars of small cross section

unless stated otherwise.

Effect of Various Aging Treatments on the Tensile Properties of .125" Thick VascoMax 250 VM Sheet*

Solution .2% Offset Ultimate Reduction Annealing Aging Aging Yield Tensile Elongation, % in. of

Temperature Temperature Time Strength Strength Area OF OF Hours ksi ksi 1" 2" %

1500 850 3 256.7 262.5 9.7 4.7 47.6 1500 900 1 256.6 264.5 9.4 4.8 48.7 1500 900 3 280.2 287.0 8.8 4.5 44.9 1500 900 6 267.5 280.1 8.5 4.2 44.7 1500 950 3 262.3 270.5 9.7 4.5 47.2

Standard ASTM sheet tensiles solution annealed for 30 minutes at the indicated temperatures, air cooled and aged as shown.

FIGURE 7.

13

.E250 C,

U,

VascoMax 250 VM ?hysical Properties

Aerage Coefficient of Thr.nal Expansion (700 - 900'F) ............... 5.6 x106 in./in./*F

fodulus of Elasticity .................. 27.0 x 10-6 psi Density ............................ .289 lbs./cu. in. (8.0 g/cc)

Thermal Conductivity at 68*F .......... 14.6 BTU/(ft)(hr)(oF) at 1220F .......... 14.9 BTU/(ft)(hr)(uf) at 212 0 F ........... 15.6 BTU/(ft)(hr)(oF)

Nominal Analysis

Nickel ............ 18.50% Cobalt ........... 7.50 Molybdenum .... 4.80 Titanium ......... .40 Aluminum ........ .10 Silicon ........... .10 max. Manganese ....... .10 max. Carbon ........... .03 max. Sulfur ............ .01 max. Phosphorus ...... .01 max. Zirconium ........ .01 Boron ............ .003

Nominal Annealed Properties

Hardness ............. 30 Rc Yield Strength ........ 95 ksi Ultimate Strength ..... 140 ksi Elongation ........... 17% Reduction of Area .... 75%

Nominal Room Temperature Properties of VascoMax 250 VM after Aging

.2% Ultimate Elongation Test Yield Tensile in Reduction

Temp. Strength Strength 4.5/ of Area oF ksi ksi % %

600 224.5 233.4 11.5 56.0 800 210.8 221.0 12.0 56.1 900 185.1 200.0 16.5 64.6

1000 129.1 149.2 23.0 72.9

FIGURE 1. Effect of test temperature on the tensile properties of VascoMax 250 solution annealed for one hour at 15000 F. Air cooled and aged three hours at 9000F.

Notch Tensile Strength Notch-To-Smooth Kt Average Range Tensile Strength

ksi ksi Ratio*

2.0 403.8 401.6 - 406.4 1.49 3.0 399.0 393.6 - 402.4 1.48 5.0 381.3 376.7 - 386.3 1.41 6.25 385.7 383.9 - 392.0 1.43 7.0 377.5 375.9 - 382.3 1.40 9.0 380.7 377.5 - 383.9 1.41

*Based on smooth bar tensile strength of 270.1 ksi. FIGURE 2. Effect of stress concentration Factor. Kt, on the tensile properties of VascoMax 250 solution annealed for one hour at 15000 F., air cooled and aged three hours at 9000F.

0Compressive Strength

Proportional .2% Offset Rockwell Condition Limit Yield "C"

ksi ksi Hardness

Solution Annealed 105.0 149.0 29.0

Aged 241.3 280.0 51.0

FIGURE 3. Samples solution annealed for 30 minutes at 1500'F., air cooled and aged 3 hours at 9000 F. as indicated. Average of 3 tests per condition.

CLJ

a.E0

100

80

60

40

20

CHARPY V-NOTCH IMPACT STRENGTH Vasco Max 250 VM

-400 -200 0 200 400 600 800 1000 1200 TEST TEMPERATURE - 0 F

FIGURE 4. Effect of test temperature on the Charpy V-Notch impact strength of VascoMax 250 VM. All specimens solution annealed at 1500' F. for 30 minutes, air cooled and aged at 9000 F. for 3 hours.

a

0

VASCO LATROBE, PENNSYLVANIA

A TELEDYNE COMPANY 15650

YoCKE ULTRA WGH STREN TH MAI Rn STELS

e~1

S

0

Tensile

I.

Figure B2. Effect of aging temperature on the

tensile properties of VascoMax 250 CVM. Specimens were solution annealed for 30 minutes at 1500 0 F., air cooled and aged for 3 hours at the indicated temperatures.

0 5 10 15 20

Age Temperature -*F

Figure B3. Effect of aging time of 900 0 F. on the tensile properties of VascoMax 250 CVM. Specimens were solution annealed for 30 minutes at 15000F., air cooled and aged at 9000F. for the times indicated.

90

60

C3

30

25

Age Time - Hours

a-

400

350

300

250

200

150

100

I I True Ff -. ure Stress

Ultimate Tensile

0.2% Yield

VascoMax 250 CVM

Reduction in Area

Elongation

9 S

CHARPY V-NOTCH IMPACT STRENGTH

Vasco Max, 250 CVM

100

4 I

80 4

C

n) 60

E 40

0

0.

-4 0 200 400 600 800 1000 1200

Test Temperature -*F

Figure B4. Effect of test temperature on the Charpy V-notch impact strength of VascoMax 250 CVM. All specimens solution annealed at 15000 F. for 30 minutes, air cooled and aged at 9000 F. for 3 hours.

Table B2 COMPRESSIVE STRENGTH OF VascoMax 250 CVM

Samples solution annealed for 30 minutes at 1500*F., air cooled and aged 3 hours at 9000F. as indicated. Average of 3 tests per condition.

Coinpressive Strength

Proportional .2%, Offset Rockwell Limit Yield "C"

Condition ksi ksi Hardness

Solution Annealed . . . . . 105.0 149.0 29.0

Aged . . . . . . . 241.3 280.0 51.0

Impact Compression

F ~ -*~- .- ~

00 -200

mechanical testing of steam generator support bolts

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