alloy 81 NIMONIC - specialmetals.com · NIMONIC ® alloy 81 NIMONIC® alloy 81 is a wrought nickel alloy hardened by controlled additions of titanium and aluminum, and designed to

NIM

ONIC

®al

loy

81

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NIMONIC® alloy 81 is a wrought nickel alloy hardenedby controlled additions of titanium and aluminum, anddesigned to provide enhanced resistance to hightemperature corrosion coupled with good hightemperature strength.

It has excellent hot corrosion resistance due to itshigh chromium content. Elevated temperature strengthcharacteristics are similar to those of NIMONIC alloy80A. Melting, hot-working, cold-working andmachining practices are also broadly similar to those forNIMONIC alloy 80A.

Applications include components for gas turbines,piston engine exhaust valves, and heat-exchange plantsubject to attack by deposits resulting from thecombustion of impure fuels, particularly by alkali metalsulfates and chlorides.

NNoommiinnaall CCoommppoossiittiioonn% max. unless stated

Carbon.................................................................................0.05

Silicon ..................................................................................0.50

Copper.................................................................................0.20

Iron.........................................................................................1.0

Manganese ..........................................................................0.50

Chromium ............................................................................30.0

Titanium.................................................................................1.8

Aluminum...............................................................................0.9

Cobalt ....................................................................................2.0

Molybdenum........................................................................0.30

Boron .................................................................................0.003

Zirconium.............................................................................0.06

Sulfur .................................................................................0.015

Nickel .............................................................................Balance

HHeeaatt TTrreeaattmmeenntt

Publication Number SMC-095Copyright © Special Metals Corporation, 2004 (Sept 04)

NIMONIC is a trademark of the Special MetalsCorporation group of companies.

NIMONIC alloy 81 is normally used in the solution-and precipitation-treated condition. This heat treatmentis generally carried out in air. Material is usuallysupplied in the solution-treated condition and is aged bythe customer as part of the fabrication process.NIMONIC alloy 81 can, however, be supplied to anyrequested heat-treatment condition. Details of therecommended heat treatments for various forms aregiven below, where the stated times represent the timesat temperature. In establishing furnacing time dueallowance must, of course, be made for furnacecharacteristics and charge weight.

FFoorrmm

Extruded or forged barand section for forging,rolling and /or machining

Hot-rolled plate andsheet

Cold-rolled sheet

SSoolluuttiioonnttrreeaattmmeenntt

8h/1100°C/AC or WQ

approx.½h/1100°C/AC or WQ

5-15min/1100°C/FBQ or WQ

AAggiinnggttrreeaattmmeenntt

16h/700°C/AC

16h/700°C/AC

16h/700°C/AC

Hot-worked products may be cooled from the solution-treatment temperature either by air cooling (AC) or bywater quenching (WQ). Cold-worked products,especially sheet, may be fluidized bed quenched (FBQ):this produces less distortion than water quenchingwithout a significant change in properties.

Interstage annealing to remove residual cold-workis normally applied during manipulation operations.The following treatment is recommended for sheet:

5-15 min/1100°C/AC or WQWelding operations should be carried out with the

alloy in the solution-treated condition. A full, twostage heat treatment should then be applied to developmaximum properties in the welded component.

Details of welding practice are given subsequentlyunder “Fabrication”.

NNIIMMOONNIICC®® aallllooyy 8811

2

TTaabbllee 11 - Mean Coefficient of Linear Thermal Expansion

µµmm//mm •• °°CC

20-100

20-200

20-300

20-400

20-500

20-600

20-700

20-800

20-900

20-1000

Mean coefficient of linear expansion between 20°C and temperature shown.

°°CCCCoolldd rroolllleedd sshheeeett

EExxttrruuddeedd aannddssuubbsseeqquueennttllyy ssttrreettcchheedd bbaarr

PPhhyyssiiccaall PPrrooppeerrttiieess

Density, Mg/m3 ............................................................................8.06

lb/in3 ............................................................................0.291

Melting Range

Liquidus temperature, °C.....................................................1375

Solidus temperature, °C ......................................................1305

The exact density value is dependent on compositionalvariation within the release specification, on form, and onheat treatment.

TTaabbllee 22 - Physical Properties

TTeemmppeerraattuurree SSppeecciiffiicc HHeeaatt

°°CC JJ//kkgg••°°CC WW//mm••°°CC

EElleeccttrriiccaall RReessiissttiivviittyy aatt 2200°°CC == 11..2277 µµ ΩΩ •• mm

TThheerrmmaall CCoonndduuccttiivviittyy

RReellaattiivvee RReessiissttaannccee

20

100

200

300

400

500

600

700

800

900

1000

461

461

502

502

544

586

586

628

670

670

712

10.9

12.6

13.8

15.5

17.2

18.4

20.1

21.8

23.4

25.5

27.2

1.000

1.013

1.028

1.043

1.057

1.067

1.068

1.065

1.059

1.050

1.047

11.1

12.5

13.0

13.5

14.0

14.6

15.2

16.3

18.8

19.5

11.7

12.3

12.8

13.2

13.6

14.0

14.4

15.1

16.0

17.4

TTaabbllee 33 - Dynamic Moduli

DDyynnaammiicc YYoouunngg’’ss mmoodduulluuss

20

100

200

300

400

500

600

700

800

900

1000

°°CC

DDyynnaammiiccttoorrssiioonnaallmmoodduulluussEExxttrruuddeedd bbaarr

196

194

188

181

177

170

163

156

147

134

123

212

210

205

199

194

188

181

172

163

150

133

80

79

77

75

72

69

66

62

59

54

48

SShheeeett

GGPPaa GGPPaa GGPPaa

DDyynnaammiicc MMoodduullii


3

TTeennssiillee PPrrooppeerrttiieess

Str

ess,

MP

a

Elo

ngat

ion

and

red

uctio

n of

are

a, %

FFiigguurree 11.. Tensile properties of extruded bar subsequently cold stretchedHeat treatment 8h/1100°C/AC + 16h/700°C/ACStrain rate 0.005/min to proof stress (at room temperature) and 0.002/min to proof stress (atelevated temperatures) and 0.1/min thereafter.

Temperature, °C0 200 400 600 800 1000

Temperature, °F

200 400 600 800 1000 1200 1400 1600 1800

Reduction of area

0.2 % proof stress

Tensile Strength

1600

1200

800

400

0

80

60

40

20

0

220

200

180

160

140

120

100

80

60

40

20

0

100

80

60

40

20

0

tonf/in2 103lbf/in2

Elongation

Str

ess,

MP

a

Elo

ngat

ion

and

red

uctio

n of

are

a, %

FFiigguurree 22.. Tensile properties of cold rolled sheetHeat treatment 15 min/1100°C/FBQ or WQ + 16h/700°C/AC

Temperature, °C0 200 400 600 800 1000

Temperature, °F

200 400 600 800 1000 1200 1400 1600 1800

0.2 % proof stress

Tensile Strength

1600

1200

800

400

0

80

60

40

20

0

220

200

180

160

140

120

100

80

60

40

20

0

100

80

60

40

20

0

tonf/in2 103lbf/in2

Elongation


4

TTeennssiillee PPrrooppeerrttiieess ((ccoonnttiinnuueedd))

TTaabbllee 44 - Tensile Properties of Autogenously Welded Sheet

All Samples except that tested at 1000°C fractured in the weld.

HHeeaatt ttrreeaattmmeenntt 1155 mmiinn//11110000°°CC//AACC ++ wweelldd ++ 1155 mmiinn//11110000°°CC//AACC ++ 1166 hh//770000°°CC//AACC

EElloonnggaattiioonn,, %%oonn 2255 mmmm oonn 5500 mmmm°°CC

TTeennssiillee SSttrreennggtthhMMPPaa

00..22%% PPrrooooff SSttrreessssMMPPaa


20

100

200

400

600

650

700

750

800

850

900

1000

536

551

499

503

403

445

406

425

391

318

158

37

565

570

513

520

423

466

431

442

412

344

168

42

874

860

808

819

641

653

596

598

513

394

229

76

14.0

14.0

16.0

17.0

16.0

13.0

12.0

12.0

10.0

12.0

30.0

96.0

11.5

12.0

14.0

15.0

13.0

9.5

9.5

11.0

8.0

9.5

25.5

62.0

TTaabbllee 55 - Tensile Properties of Filler Metal Welded Sheet

All Samples except those tested at 700°C and 1000°C fractured in the weld.

HHeeaatt ttrreeaattmmeenntt 1155 mmiinn//11110000°°CC//AACC ++ wweelldd ++ 1155 mmiinn//11110000°°CC//AACC ++ 1166 hh//770000°°CC//AACC

EElloonnggaattiioonn,, %%oonn 2255 mmmm oonn 5500 mmmm°°CC

TTeennssiillee SSttrreennggtthhMMPPaa



20

100

200

400

600

650

700

750

800

850

900

1000

568

537

534

499

494

477

420

419

375

284

170

32

596

558

539

513

508

500

459

448

426

310

190

37

961

978

914

854

791

737

641

571

524

388

238

77

20.0

24.0

21.0

22.0

18.0

14.0

12.0

8.0

6.0

7.0

11.0

66.0

16.0

22.0

17.5

20.0

15.5

11.5

12.0

5.0

4.5

5.0

9.0

56.0

CCrreeeepp PPrrooppeerrttiieess

Typical creep-rupture data for extruded bar subsequentlycold-stretched and heat-treated 4h/1100°C/AC + 16h/700°C/AC are shown by Larson-Miller presentation in Figure 3,and as log stress-log time plots in Figure 4.

Total plastic stain data for bar are shown in Table 6.

BBAARR

Typical creep-rupture data for cold-rolled sheet given therecommended heat treatment of 15 min/1100°C/AC +16h/700°C/AC, are shown by Larson-Miller presentation inFigure 5, and as log stress-log time plots in Figure 6.

Total plastic strain data for sheet are shown in Table 7.

SSHHEEEETT


5

5 10 15 20 25 30 35

°C°F

12002200

2100

11002000

19001000

1800

1700900

1600

8001500

1400

7001300

1200

6001100

1000

500900

800400

700

300600

500

200400

300

100200

20100

2300

10-1 101 102 103 104 105100

Time, Hours

1

1501009080

50

60

708090

10070

60

50

40

30

20

25

30

4025

20

15

151098

10987

6

76

5

45

43

2

1.5

3

2

1.5

1

103

lbf/

in2

MP

a x

101

FFiigguurree 33.. Creep-rupture properties for bar. Fully heat-treated condition.

tonf

/in2

0.4

2.5

2.0

1.5

1.00.90.80.70.6

0.5

20

25

15

109.08.07.0

6.0

5.0

4.0

3.0

7060

50

40

30

Larson-Miller Parameter, T (20 + log t) x 10-3; T in °K, t in hours


6

FFiigguurree 44.. Creep-rupture properties for bar. Fully heat-treated condition.

600°C

Time, hours

Str

ess,

MP

a

1000

900

800

700

600

500

400

300

200

100

90

80

70

60

50

40

30

2010 100 1000 10 000 100 000

500°C

800°C

700°C

140130

120

110

100

90

80

706560

55

50

45

40

35

30282624

22

20

18

16

14

12

10

9

8

7

6

5

4

3

60

55

50

45

40

35

30282624

22

20

18

16

14

12

10

9

8

7

6

5

4

3

2.5

2

1.5

Notched

tonf/in2 103lbf/in2

d

SSttrreessss,, MMPPaa,, ttoo ggiivvee ttoottaall ppllaassttiicc ssttrraaiinn iinn


7

TTaabbllee 66 - Total Plastic Strain Data for Extruded and Subsequently Cold Stretched Bar

The value in parentheses is extrapolated from isothermal curves.

HHeeaatt ttrreeaattmmeenntt 44hh//11110000°°CC//AACC ++ 1166hh//770000°°CC//AACC

TTeesstt TTeemmppeerraattuurree

°°CC 110000hh 330000hh 11000000hh 33000000hh

0.1

0.2

0.5

1.0

0.1

0.2

0.5

1.0

0.1

0.2

0.5

1.0

494

—

564

—

247

286

317

—

94

117

144

—

440

479

510

533

193

239

270

286

59

82

110

119

386

432

448

463

142

185

224

239

31

49

71

82

—

378

402

(402)

—

139

—

—

—

—

—

49

SSttrraaiinn,, %%

770000

880000

660000


8

5 10 15 20 25 30 35

°C°F

12002200

2100

11002000

19001000

1800

1700900

1600

8001500

1400

7001300

1200

6001100

1000

500900

800400

700

300600

500

200400

300

100200

20100

2300

10-1 101 102 103 104 105100

Time, Hours

1

1501009080

50

60

708090

10070

60

50

40

30

20

25

30

4025

20

15

151098

10987

6

76

5

45

43

2

1.5

3

2

1.5

1

103

lbf/

in2

MP

a x

101

FFiigguurree 55.. Creep-rupture properties for sheet. Fully heat-treated condition.

tonf

/in2

0.4

2.5

2.0

1.5

1.00.90.80.70.6

0.5

20

25

15

109.08.07.0

6.0

5.0

4.0

3.0

7060

50

40

30

Larson-Miller Parameter, T (20 + log t) x 10-3; T in °K, t in hours


9

FFiigguurree 66.. Creep-rupture properties for sheet. Fully heat-treated condition.

600°C

Time, hours

Str

ess,

MP

a

1000

900

800

700

600

500

400

300

200

100

90

80

70

60

50

40

30

2010 100 1000 10 000 100 000

650°C

800°C

750°C

700°C

140130

120

110

100

90

80

706560

55

50

45

40

35

30282624

22

20

18

16

14

12

10

9

8

7

6

5

4

3

60

55

50

45

40

35

30282624

22

20

18

16

14

12

10

9

8

7

6

5

4

3

2.5

2

1.5

Plain Heat treatment: 15 min/1100°C/AC+ 16h/700°C/AC

Autogenously welded

Filler metal welded

tonf/in2 103lbf/in2

15 min/1100°C/AC + weld+ 15 min/1100°C/AC+ 16h/700°C/AC


10

SSttrreessss,, MMPPaa,, ttoo ggiivvee ttoottaall ppllaassttiicc ssttrraaiinn iinn

TTaabbllee 77 - Total Plastic Strain Data For Cold-Rolled Sheet

The values in parentheses are extrapolated from isothermal curves.

HHeeaatt ttrreeaattmmeenntt 1155 mmiinn//11110000°°CC//AACC ++ 1166hh//770000°°//AACC


°°CC 5500hh 110000hh 330000hh 11000000hh 33000000hh 1100 000000hh

0.1

0.2

0.5

1.0

Rupture

0.1

0.2

0.5

1.0

Rupture

0.1

0.2

0.5

1.0

Rupture

0.1

0.2

0.5

1.0

Rupture

0.1

0.2

0.5

1.0

Rupture

380

480

(600)

—

640

205

335

(455)

—

470

130

185

250

305

355

54

77

119

(155)

210

(16)

25

50

77

140

343

430

520

552

610

170

280

380

(425)

430

105

146

196

238

295

(41)

(56)

84

111

175

—

(15)

32

50

115

(292)

362

437

470

540

(125)

210

285

320

370

(74)

100

133

161

220

—

(34)

(48)

(65)

132

—

—

(15)

(25)

76

(245)

(300)

364

390

465

—

(155)

207

233

295

(51)

(67)

(88)

107

160

—

—

—

(36)

83

—

—

—

—

45

—

(250)

(307)

(330)

365

—

—

(155)

(175)

223

—

—

—

72

108

—

—

—

—

(50)

—

—

—

—

(28)

—

—

—

—

(267)

—

—

—

—

(163)

—

—

—

—

(61)

—

—

—

—

(29)

—

—

—

—

(17)

SSttrraaiinn,, %%

660000

665500

770000

775500

880000


11

FFaattiigguuee PPrrooppeerrttiieess

MMeecchhaanniiccaall ffaattiigguuee

Mechanical fatigue for fully heat-treated NIMONIC alloy 81has been examined by the rotating bend technique.Specimens of a minimum diameter of 4.06 mm were testedat 700°C and a nominal 3000 revolutions per minute.

TThheerrmmaall ffaattiigguuee

Thermal fatigue testing of NIMONIC alloy 81 has beencarried out on fully heat-treated tapered-disc specimens of41.3 mm diameter and 0.25 mm edge radius, which werealternately immersed in hot and cold fluidized beds. Meanvalues for the number of cycles to give the firstmicroscopically distinguishable crack are presented inTable 9. These data are compared with NIMONIC alloy80A, given the 8h/1080°C/AC + 16h/700°C/AC heattreatment and tested under the same conditions. Thesuperiority of NIMONIC alloy 81 under these testconditions is clearly demonstrated.

IImmppaacctt DDaattaa

The room temperature Charpy impact strength for NIMONICalloy 81 has been examined on one cast of extruded barsubsequently cold stretched, and heat-treated 4h/1100°C/AC+ 16 h/700°C/AC. A value of 62J was obtained.

The same material was also used to investigate long termembrittlement by room temperature testing.

TTaabbllee 88 - Rotating Bend Fatigue Tests at 700°C

FFaattiigguuee lliiffee

550

463

386

309

SSttrreessssMMPPaa CCyycclleess xx 110066HHoouurrss

0.078

12.6

71.6

357.0

0.014

2.263

12.879

64.250

TTaabbllee 1100 - Room Temperature Charpy V-Notch Impact Tests

SSooaakkiinngg tteerrmmppeerraattuurree,, °°CCSSooaakkiinngg

ttiimmeehh

JJ JJ JJ JJ JJ

73

75

64

47

30

62

61

56

56

—

62

58

54

52

43

72

77

77

81

85

111

103

117

104

—

30

100

1000

3000

10 000

550000 660000 770000 880000 990000

TTaabbllee 99 - Thermal Fatigue Tests Using Taper-Disc Specimens

NNIIMMOONNIICC aallllooyy 8811 NNIIMMOONNIICC aallllooyy 8800AAPPeeaakk

TTeemmppeerraattuurree°°CC MMeeaann ooff nnuummbbeerr ooff ccyycclleess ttoo

iinniittiiaattee ccrraacckkiinngg

876

99

800

900

NNuummbbeerr ooff tteessttss

MMeeaann ooff nnuummbbeerr ooff ccyycclleess ttoo iinniittiiaattee ccrraacckkiinngg

NNuummbbeerr ooff tteessttss

2

2

398

40

3

4


12

CCoorrrroossiioonn RReessiissttaannccee

The oxidation resistance of NIMONIC alloy 81 has beenexamined using the thermobalance technique. The resultsare given in Figure 8.

The effect of exposing NIMONIC alloy 81 for 1000hours in air containing 3% sulfur dioxide is indicated inTable 11, where the weight loss was determined afterelectrolytic descaling in molten caustic soda. Comparabledata for NIMONIC alloy 80A are also given.

The corrosion of NIMONIC alloy 81 in salt mixtures isshown in Table 12. Specimens 19.1 mm long by 12.7 mmdiameter, and having a wet ground surface finish, were usedfor these tests. The weight loss was determined afterelectrolytic descaling in molten caustic soda. Comparabledata for NIMONIC alloy 80A where available are alsoshown.

Additional hot corrosion tests under intermittent saltshower conditions at 800°C are shown in Figure 7.Comparable data for NIMONIC alloy 80A are also given.

Des

cale

d w

eigh

t lo

ss,

mg/

cm2

0

FFiigguurree 77.. Intermittent salt shower corrosion tests (75% Na2 SO4 + 25% NaCl at 800°C)

TTaabbllee 1111 - Gaseous Corrosion in Air/Sulfur Dioxide Mixture

11000000 hhoouurr eexxppoossuurree iinn aaiirr ccoonnttaaiinniinngg 33%% bbyy

vvoolluummee SSOO22.. WWeeiigghhtt lloossss aafftteerr eelleeccttrroollyyttiicc

ddeessccaalliinngg iinn mmoolltteenn ccaauussttiicc ssooddaa,,

mmgg//ccmm22

600

700

800

900

TTeemmppeerraattuurree°°CC

NNIIMMOONNIICC aallllooyy 8800AANNIIMMOONNIICC aallllooyy 8811

1.4

0.7

2.0

3.5

20.0

4.2

–

–

50

100

150

200

250

300

350

60 120 180 240 300

Time, hours

NIM

ON

IC a

lloy

80A

NIMONIC alloy 81


13

WWeeiigghhtt lloossss ((mmgg//ccmm22)) ddeetteerrmmiinneedd aafftteerr eelleeccttrroollyyttiicc ddeessccaalliinngg iinn mmoolltteenn ccaauussttiicc ssooddaa

TTaabbllee 1122 - Salt Mixture Corrosion - Crucible Tests

AAllllooyy

1166hh 330000hh 1166hh 330000hh 1166hh 330000hh 1166hh 330000hh 1166hh 330000hh

0.9

0.8

2

6

—

—

—

—

1

4

13

22

—

1.4

1640

—

0.9

2

4

8

—

1453

1290

1302

4

14

15

32

—

899

1170

—

3

4

3

6

—

—

—

—

20

20

22

76

—

594

1560

—

27

49

46

280

—

—

—

—

84

317

591

861

—

1438

477

—

31

1

13

18

—

—

—

—

15

16

14

21

—

154

86

—


NNIIMMOONNIICCaallllooyy8811

NNIIMMOONNIICCaallllooyy8800AA

HHaallff--iimmmmeerrsseeddiinn

NNaa22SSOO44 ++00..55%% NNaaCCll


NNaa22SSOO44 ++2255%% NNaaCCll


NNaa22SSOO44 ++2200%% VV220055


NNaa22SSOO44 ++8800%% VV220055


NNaa22SSOO44 ++ 2200%% NNaaCCll++ 2200%% VV220055

700

800

900

1000

700

800

900

1000

FFiigguurree 88.. Cyclic oxidation properties of NIMONIC alloys 80A and 81 (Heating cycle: 20 minutes at temperature, 10 minutes at room temperature)

Wei

ght

chan

ge,

mg/

cm2

0

200

Time, hours

400 600 800

-100

-200

-300

-400

NIMONIC alloy 81

NIMONIC alloy 80A

950°C

950°C

1100°C

1100°C


14

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NIMONIC alloy 81 may be hot worked in the temperaturerange 950-1160°C.

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Average mechanical properties pertinent to cold formingoperations on annealed sheet, 1.2 mm thick, are given inTable 13.

0.1 % proof stress 414 MPa



Tensile strength 897 MPa

Percentage of elongation on 50 mm 38.3

Hardness 230 HV*

Mean grain size ASTM 7

Grain size range ASTM 5.5-8.0

Erichsen value 11.3 mm

Typical plastic anisotropy, R value† 0.93

Shear strength 669 MPa

Ratio of shear to tensile strength 0.75

* A typical hardness range of 200-230 HV is obtained on productionannealed and flattened material.

NIMONIC alloy 81 can be compared with NIMONIC alloy80A in terms of welding response. It is readily welded bythe tungsten inert-gas shielded process (T.I.G. welding) insection thicknesses up to 5 mm but above this thicknessthere is the likelihood of heat-affected-zone cracking. Sheetshould be in the solution-treated condition prior to weldingand the full heat treatment of 5-15 min/1100°C/AC +16h/700°C/AC should be applied after welding. Filler wireof matching composition is normally used and jointefficiencies of at least 90% are obtained.

In laboratory circular fusion weldability testsNIMONIC alloy 81 has been shown to be slightly better thanNIMONIC alloy 80A, particularly under repair weldingconditions. When repair welding fully heat-treated weldmaterial the repair weld can be directly aged withoutcracking whereas under similar conditions NIMONIC alloy80A suffers from heat-affected-zone cracking. Underconditions of severe restraint it may, however, be advisableto apply the solution treatment prior to precipitationhardening after repair welding.

Other welding processes which can be applied toNIMONIC alloy 81 include dip-transfer welding (inthicknesses up to 5 mm), resistance-spot, -stitch, and -seamwelding and flash-butt welding. For these processes theconditions normally used for NIMONIC alloy 80A shouldbe used as a guide for determining the exact weldingparameters. When welding to other NIMONIC alloys thefiller wire used for the stronger member of the combinationshould be used. For example, when welding to NIMONICalloy 90 use NIMONIC filler metal 90. If welding ofNIMONIC alloy 81 to stainless steels or mild steel isrequired, then INCONEL filler metal 82 should be used.

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NIMONIC alloy 81 bar or heavy section may be softened bya heat treatment of 2 to 4 hours at 1100°C followed by aircooling. A solution treatment of 8 hours at 1100°C followedby air cooling is recommended prior to precipitationhardening.

Annealing of NIMONIC alloy 81 sheet required duringmanipulation operations should be by heating for 5 to 15minutes at 1100°C followed by rapid cooling: waterquenching for heavier sheet and air cooling for thin section.Fluidized bed quenching may also be used.

† Mean value of plastic anisotropy ratio R for tests at 0°, 45° and 90° to thefinal rolling direction using the formula R = ¼(Ro° + 2R45° + R90°)

The data contained in this publication is for informational purposes only and may be revised at any time without prior notice. The data is believed to be accurate and reliable, butSpecial Metals makes no representation or warranty of any kind (express or implied) and assumes no liability with respect to the accuracy or completeness of the informationcontained herein. Although the data is believed to be representative of the product, the actual characteristics or performance of the product may vary from what is shown in thispublication. Nothing contained in this publication should be construed as guaranteeing the product for a particular use or application.

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NIMONIC alloy 81 is available in the following forms,subject to minimum order quantities:

Bars and billets for forgingRods and bars for machiningExtruded sections, rectangular or profile, for

machining, rolling and welding into rings, etc.Hot-rolled plate and sheetCold-rolled sheet and stripCold-worked tubesCold-drawn wire and filler wire

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BRIGHTRAY®

CORRONEL®

DEPOLARIZED®

DURANICKEL®

FERRY®

INCOBAR®

INCOCLAD®

INCO-CORED®

INCOFLUX®

INCOLOY®

INCONEL®

INCOTEST®

INCOTHERM®

INCO-WELD®

KOTHERM®

MONEL®

NILO®

NILOMAG®

NIMONIC®

NIOTHERM®

NI-ROD®

NI-SPAN-C®

RESISTOHM®

UDIMAR®

UDIMET®

601GC®

625LCF®

718SPF™

725NDUR®

800HT®

956HT™

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alloy 81 NIMONIC - specialmetals.com · NIMONIC ® alloy 81 NIMONIC® alloy 81 is a wrought nickel alloy hardened by controlled additions of titanium and aluminum, and designed to