Inconel Alloy 625LCF

INCO

NEL®

allo

y 62

5LCF

®

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INCONEL® alloy 625LCF (UNS N06626 / W. Nr. 2.4856) was developed as a fatigue-resistant, bellows-qualityversion of INCONEL alloy 625. Alloying, melting and processing are designed and controlled to provide a sheetproduct with optimum resistance to low-cycle and thermal fatigue at up to 1200°F (650°C). The alloy offers a highlevel of performance in aircraft exhaust and automotive flexible coupling bellows, expansion joints in process ortransport piping, and other applications involving resistance to low-cycle or thermal fatigue.

INCONEL alloy 625LCF is covered by U.S patent 4,765,956.

TTaabbllee 11 - Limiting Chemical Composition, wt %*

*UNS N06626 aPlus Ta.

ªMean coefficient of linear expansion between 70°F (21°C) and temperature shown.

Nickel..........................................................................58.0 min.

Chromium..................................................................20.0-23.0

Molybdenum................................................................8.0-10.0

Niobiuma.....................................................................3.15-4.15

Iron...............................................................................5.0 max.

Carbon.......................................................................0.03 max.

Manganese................................................................0.50 max.

Silicon........................................................................0.15 max.

Sulfur........................................................................0.015 max.

Aluminum...................................................................0.40 max.

Titanium ....................................................................0.40 max.

Phosphorus.............................................................0.015 max.

Cobalt.........................................................................1.0 max.

Nitrogen....... ...........................................................0.02 max.

TThheerrmmaall aanndd EElleeccttrriiccaall PPrrooppeerrttiieess

-250-200-100

07020040060080010001200

-----

7.17.37.47.67.88.2

5052586468758798109121132

---

0.0960.0980.1020.1090.1150.1220.1280.135

----

776794806812818830830

-150-100-5020100200300400500600700

----

12.813.113.313.713.914.414.9

7.47.98.79.711.012.413.815.316.918.319.8

---

410429454479502528553578

---

1.291.321.341.351.361.371.381.38

TTeemmppeerraattuurree

°°FF

CCooeeffffiicciieennttooff EExxppaannssiioonnaa

1100--66iinn//iinn••°°FF

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°°CC

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µµΩΩ--mm

TTaabbllee 22 - Thermal and Electical Properties

PPhhyyssiiccaall PPrrooppeerrttiieess

TTaabbllee 33 - Physical Properties

Density, lb/in3....................................................................0.305

g/cm3.....................................................................8.44

Melting Range, °F.....................................................2350-2460

°C....................................................1290-1350

Curie Temperature, °F.......................................................<-320

°C......................................................<-196

Permeability at 200 oersted (15.9 kA/m)........................1.0006

IINNCCOONNEELL®® aallllooyy 662255LLCCFF®®

2

TTaabbllee 66 - Effect of Long-Time Exposure to 1200°F (650°C) on Room-Temperature Properties

EExxppoossuurree TTiimmee

EElloonnggaattiioonnTTeennssiilleeSSttrreennggtthh

YYiieellddSSttrreennggtthh

((00..22%% OOffffsseett))

MMoonntthhss %%kkssii MMPPaa

INCONEL alloy 625LCF has an average grain size of ASTMNo. 5 (0.0025 in/0.064 mm) or finer. The outstandingcharacteristic of this alloy is its low-cycle fatigue strengthderived primarily from controlled microstructure, grain sizeand yield strength.

The same factors that enhance resistance to mechanicalfatigue also improve resistance to thermal fatigue. The alloy,like alloy 625, undergoes a microstructural phase formationduring long-time exposure to intermediate elevatedtemperatures. Such exposure can increase the strength of thealloy while lowering ductility and impact properties.Because of the phase formation, with the unfavorable effectof fine grain on creep-rupture properties, INCONEL alloy625LCF is not recommended for extended use at high stresslevels above 1200°F (650°C).

*Yield strength requirement may not apply to sheet thickness under 0.010 in (0.25 mm).Elongation requirement may not apply to thicknesses under 0.005 in (0.13 mm). Allrequirements are at room temperature.

115500

114400

113300

112200

111100

110000

9900

8800

7700

11000000

990000

880000

770000

660000

550000

110011 110022 110033 110044 110055 110066

Cycles to Failure

Pea

k S

tres

s, k

si

TTaabbllee 55 -- Room-Temperature Mechanical Propertiesa

Pea

k S

tres

s, M

Pa

7020040060080010001200

-

30.129.628.727.826.925.924.7

-

11.811.611.110.810.49.99.4-

0.280.280.290.290.290.310.31

-

20100200300400500600700

208203198192187181174166

81.479.376.974.572.469.666.562.7

0.280.280.290.290.290.300.310.32


°°FF

YYoouunngg’’ssMMoodduulluuss

kkssii xx 1100³³


°°CC

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kkssii xx 1100³³

PPooiissssoonn’’ssRRaattiioo

µµ

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GGPPaa

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RRoooomm--TTeemmppeerraattuurree MMeecchhaanniiccaall PPrrooppeerrttiieess

Minimum Tensile Strength, ksi....................................................120

MPa.................................................827

Minimum Yield Strength (0.2% Offset)

ksi...........................................................................60

MPa......................................................................414

Minimum Elongation, %................................................................40

Bend Tent:

Thicknesses of 0.050 in (1.27 mm)

and under.................................................................................1T

Thicknesses over 0.050 in (1.27 mm)

through 0.100 in (2.54 mm) .....................................................2T

TTaabbllee 44 - Modulus of Elasticity

FFiigguurree 11 -- Low-Cycle Fatigue Strengthª at Room Temperature

ªPull/pull tests with 5 ksi (34 MPa) base stress.

kkssii MMPPaa

HHaarrddnneessss

%%

As Annealed

3

6

9

12

66.4

132.8

131.3

132.7

132.2

458

916

905

915

912

130.4

177.7

179.5

187.9

180.9

899

1225

1238

1296

1247

49

24

23

17

19

92b

35

35

36

37

YYiieelldd SSttrreennggtthh ((00..22%% ooffffsseett))


3

TTaabbllee 77 - Effect of Percent Cold Work on Tensile Properties of Annealed Material

PPeerrcceennttRReedduuccttiioonn

EElloonnggaattiioonn HHaarrddnneessssTTeennssiillee SSttrreennggtthhYYiieelldd SSttrreennggtthh ((00..22%% OOffffsseett))

%% %%MMPPaaMMPPaakkssii kkssii

TTaabbllee 88 -- Tensile Properties for Two Annealing Temperatures

TTaabbllee 99 - Effect of 2150°F (1180°C)/5 Minutes/AC Anneal on Annealed and Annealed-Plus-Aged Room-Temperature Properties

kkssiikkssii MMPPaa %%MMPPaa

TTeennssiillee SSttrreennggtthhYYiieelldd SSttrreennggtthh((00..22%% OOffffsseett))CCoonnddiittiioonn

AASSTTMMGGrraaiinnSSiizzee

EElloonnggaattiioonn

AASSTTMMGGrraaiinn SSiizzee

RRoooomm--TTeemmppeerraattuurree MMeecchhaanniiccaall PPrrooppeerrttiieess ((ccoonnttiinnuueedd))

5

10

15

20

30

40

50

9

9

9

9

10

10

10

81.7

67.0

69.3

76.1

76.4

76.7

79.0

563

462

478

525

527

529

545

138.0

132.8

135.0

140.9

141.2

141.0

147.5

952

916

931

972

974

972

1017

46

48

48

46

42

42

40

99

96

97

97

98

98

98

TTiimmeeTTeennssiillee SSttrreennggtthhYYiieelldd SSttrreennggtthh ((00..22%% ooffffsseett))TTeennssiillee SSttrreennggtthh

15

30

60

120

68.0

67.1

67.1

65.5

469

463

463

452

129.7

129.2

129.1

129.4

894

891

890

892

50

50

49

50

-

68.7

62.1

61.9

-

474

428

427

-

133.3

126.2

126.2

-

919

870

870

-

52

52

51

11775500°°FF ((995555°°CC)) 11885500°°FF ((11001100°°CC))

mmiinn kkssii MMPPaa kkssii MMPPaa %% kkssii MMPPaa kkssii MMPPaa %%

EElloonnggaattiioonnEElloonnggaattiioonn

As Annealed

Annealed + 1200°F (650°C)/100 h/AC

Annealed + 1400°F (760°C)/100 h/AC

46.3

68.0

56.5

319

469

390

111.6

125.1

121.3

767

863

836

63

55

50

TTaabbllee 1100 - Effect of 1950°F (1070°C)/5 Minutes/AC Anneal on Annealed and Annealed-Plus-Aged Room-Temperature Properties

kkssiikkssii MMPPaa MMPPaa

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As Annealed

Annealed + 1200°F (650°C)/100 h/AC

Annealed + 1400°F (760°C)/100 h/AC

77.6

121.2

88.3

535

836

609

138.8

151.0

146.8

957

1041

1012

45

31

36

HHaarrddnneessss

RRbb

5.5 84

5.0 24c

5.0 95

9.5 96

9.5 100

9.0 96

%%

AASSTTMMGGrraaiinnSSiizzee

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4

HHiigghh TTeemmppeerraattuurree MMeecchhaanniiccaall PPrrooppeerrttiieess

FFiigguurree 22 -- High-Temperature Tensile Properties of Annealed Sheet

1000 1200 14000 200 400 600 800

Temperature, °C

Temperature, °F

Str

ess,

ksi

E

long

atio

n, %

Str

ess,

MP

a

160

140

120

100

80

60

40

20

0

1100

1000

900

800

700

600

500

400

300

200

100

0

500 600 7000 100 200 300 400

Tensile Strength

Yield Strength(0.2% Offset)

Elongation

Cycles to Failure

Pea

k S

tres

s, k

si

Pea

k S

tres

s, M

Pa

102 103 104 105 106 107

140

130

120

110

100

90

80

70

900

800

700

600

500

FFiigguurree 33 -- Ranges of low-cycle fatigue strengthª obtainable withINCONEL alloy 625LCF and alloy 625 at temperatures of 900 -1200°F (480 - 650°C)

FFiigguurree 44 -- Strain range vs. Nf for INCONEL alloy 625LCF at 1000°F (538°C)

101

100

10-1

10-2

10-3

10-4

10-5

100 101 102 103 104 105 106 107 108

Str

ain

Ran

ge

Cycles to Failure, Nf

Alloy 625

INCONELalloy 625LCF

a Pull/pull tests with 5 ksi (34 MPa) base stress.

Δετ

ΔεeΔεp


5

HHiigghh TTeemmppeerraattuurree MMeecchhaanniiccaall PPrrooppeerrttiieess ((ccoonnttiinnuueedd))

AAnnnneeaalleedd PPlluuss11110000°°FF ((559955°°CC))//330000 hh

AAss AAnnnneeaalleedd AAnnnneeaalleedd PPlluuss11330000°°FF ((770055°°CC))))//330000 hh

AAnnnneeaalleedd PPlluuss11220000°°FF ((665500°°CC))//330000 hh

CCyycclleess ttoo FFaaiilluurree

600

7000

14,500

300,000

1,900,000

>10,000,000

-

10,100

69,928

>10,000,000

>10,000,000

-

-

183,400

-

-

-

-

-

18,800

99,000

>10,000,000

>10,000,000

-

TTaabbllee 1111 - Effect of High-Temperature Exposure on Low-Cycle Fatigue Strengtha at 1100°F (595°C) (ASTM Grain Size 9.5)

PPeeaakk SSttrreessss

kkssii MMPPaa

120

110

100

90

80

70

827

758

690

621

552

483

ªPull/pull tests with 5 ksi (34 MPa) base stress

AAnnnneeaalleedd55%% CCoolldd WWoorrkk

55%% CCoolldd WWoorrkkPPlluuss 11110000°°FF

((559955°°CC))//330000 hh

CCyycclleess ttoo FFaaiilluurree

-

-

600

7000

14,500

300,000

4700

5300

>10,000,000

-

-

-

-

-

14,100

101,600

5,637,500

>10,000,000

PPeeaakk SSttrreessss

kkssii MMPPaa

140

130

120

110

100

90

965

896

827

758

690

621

11880000°°FF((998822°°CC))

11885500°°FF((11001100°°CC))

11990000°°FF((11003388°°CC))

15

30

45

60

120

8.5

8.5

8.0

8.0

7.0

8.0

7.75

7.25

7.25

6.5

7.5

7.0

6.5

6.5

6.0

6.5

6.5

6.0

5.5

5.0

TTaabbllee 1133 - ASTM Grain Size Numbers for Various AnnealingTemperatures on Cold-Rolled Sheet

TTiimmee((mmiinn))

11775500°°FF((995544°°CC))

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MMPPaa %%kkssiikkssii°°CC MMPPaa

70

110

1300

70

1100

1200

70

1100

1200

20

595

705

20

595

650

20

595

650

67.8

50.6

46.7

102.3

69.3

65.7

115.6

95.7

95.5

467

349

322

705

478

453

797

660

658

122.7

103.3

93.8

162.6

123.1

124.4

174.5

137.5

140.8

846

712

647

1121

849

848

1203

948

971

45

42

57

30

31

34

27

23

22

TTaabbllee 1122 - Effect of Cold Work and Cold Work Plus Age on LCF Properties at 1100°F (595°C) (ASTM Grain Size 9.5)

TTaabbllee 1144 - Effect of 300 Hr High-Temperature Exposures on Tensile Propertiesa

°°FF°°CC°°FF


1100 595

1200 650

As Annealed

ªAll tests were in the transverse direction. ASTM grain size, 8.5.


6

8800 kkssii((555522 MMPPaa))

SSttrreessss

-

482.0

-

30

446.0

499.0

24

32

4.0

26.9

30

27

EExxppoossuurree TTeemmppeerraattuurreeaanndd TTiimmee

As annealed

Annealed+1100°F(595°C)/300 h

TTaabbllee 1155 - Stress-Rupture Life for Annealed and Annealed-Plus-Aged Sheet at 1100°F (595°C), in Hours

HHiigghh TTeemmppeerraattuurree MMeecchhaanniiccaall PPrrooppeerrttiieess ((ccoonnttiinnuueedd))


%%



%%



%%


SSttrreessss

90.6

45.7

137.0

59

31

21

5.2

22.6

50.6

58

36

19

1.0

6.7

1.9

93

34

24

EExxppoossuurree TTeemmppeerraattuurreeaanndd TTiimmee EElloonnggaattiioonn

%%



%%



%%


As annealed

Annealed+1100°F(595°C)/300 h

Annealed+1200°F(650°C)/300 h


SSttrreessss

16.3

16.4

37

37

1.4

-

47

-

0.7

1.0

59

38


As annealed

Annealed+1100°F(595°C)/300 h



%%



%%



%%


SSttrreessss

128.9

76.1

18

19

50.0

24.7

19

28

22.9

9.1

59

38

7.9

3.1

20

17


As annealed

Annealed + 1300°F

(705°C)/300 h

TTaabbllee 1188 - Effect of 5% Cold Work on Stress-Rupture Properties of Annealed and Annealed-Plus-Aged Sheet at 1300°F (705°C).Stress-Rupture Life in Hours


%%



%%



%%



%%


7

WWeellddiinngg

CCoorrrroossiioonn RReessiissttaannccee

INCONEL alloy 625LCF (UNS N06626) has the sameexcellent corrosion resistance as INCONEL alloy 625 (UNSN06625). In mild environments such as the atmosphere,fresh and sea water, neutral salts and alkaline media, thealloy is virtually unaffected.

In more severe environments, the combination of nickeland chromium provides resistance to oxidizing chemicalsand atmospheres, and the high nickel and molybdenumsupply resistance to non-oxidating environments.

HHeeaatt TTrreeaattmmeennttss

INCONEL alloy 625LCF is available as cold-rolled,annealed sheet and strip in thicknesses from 0.005 - 0.100 in(0.13 - 2.54 mm). Widths up to 48 in (1220 mm) areavailable in flat, cut lengths or as coils up to 20,000 lb (9000kg).

AAvvaaiillaabbllee PPrroodduuccttss

TTaabbllee 1199 - Recommended Welding Products

Shielded Metal Arc Welding

INCONEL welding electrode 112

Gas Tungsten Arc Welding,Gas Metal Arc Welding

INCONEL filler metal 625

INCONEL alloy 625LCF is typically annealed at 1800°F(980°C) for 5 minutes with air cooling.

SSppeecciiffiiccaattiioonnss

INCONEL alloy 625LCF is designated as UNS N06626 andW. Nr. 2.4856, and meets the requirements for UNS N06625.

Sheet and strip- SAE AMS 5879, ASTM B 443, ASME SB443, BS 3072 (NA21), ASME Code Case 2276.

Publication Number SMC-020Copyright © Special Metals Corporation, 2006 (Oct 06)

INCONEL and 625LCF are trademarks of the SpecialMetals Corporation group of companies.

The data contained in this publication is for informational purposes only and may berevised at any time without prior notice. The data is believed to be accurate andreliable, but Special Metals makes no representation or warranty of any kind (expressor implied) and assumes no liability with respect to the accuracy or completeness ofthe information contained herein. Although the data is believed to be representative ofthe product, the actual characteristics or performance of the product may vary fromwhat is shown in this publication. Nothing contained in this publication should beconstrued as guaranteeing the product for a particular use or application.

wwwwww..ssppeecciiaallmmeettaallss..ccoomm

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Inconel Alloy 625LCF

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