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INCONEL® alloy HX (UNS N06002/W.Nr. 2.4665) is ahigh-temperature, matrix-stiffened, nickel-chromium-iron-molybdenum alloy with outstanding oxidationresistance, and exceptional strength at up to 2200°F(1200°C).
It is used for components such as combustionchambers, afterburners and tail pipes in aircraft andland-based gas turbine engines; for fans, roller hearthsand support members in industrial furnaces, and innuclear engineering.
INCONEL alloy HX is readily fabricated andwelded.
Table 1 - Limiting Chemical Composition, % by Weight
Physical PropertiesSome physical properties for INCONEL alloy HX aregiven in Table 2. Thermal conductivity data (Table 3)and electrical resistivity (Table 5) were determined from5 casts of cold-rolled sheet, 0.039-0.067 in (1-1.7 mm)thick, heated-treated at 2150°F (1175°C)/rapid air cooled.
Mean coefficient of linear thermal expansion data(Table 4) are for solution-treated material. A variationof ±5% can be expected for compositional changeswithin the release specification, processing history andform.
The dynamic moduli data (Table 6) were obtainedfrom cold-rolled sheet, 0.039-0.067 in (1-1.7 mm)thick, heat-treated at 2150°F (1175°C)/rapid air cooledand vibrated in the flexural mode.
INCONEL and NIMONIC are trademarks of the Special Metals Corporation group of companies.
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, but Special 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 information contained herein. Although the data is believed to be representative of the product, the actual characteristics or performance of the
product may vary from what i s shown in this publication. Nothing contained in this publicat ion should be construed as guaranteeing the product for a particular use
Table 4 - Mean Coefficient of Linear Thermal Expansion
INCONEL® alloy HX
Room-temperature mechanical properties, typical of a singlerepresentative heat are quoted in Table 7. Data in Fig. 1 arefor cold-rolled sheet, 0.039-0.067 in (1-1.7 mm) thick, heat-treated at 2150°F (1175°C)/rapid air cooled. Strain rates of 0.005/min to proof stress (at room temperature), 0.002/minto proof stress (at elevated temperatures), and 0.1 minthereafter.
Data in Fig. 2 are for cold-rolled, welded sheet, 0.039-0.067 in (1-1.7 mm) thick, heat-treated at 2150°F
(1175°C)/rapid air cooled. The sheet was welded by the gas-tungsten-arc (T.I.G.) process using INCONEL filler metalHX with argon as the shielding gas.
Creep-rupture properties of sheet (heat-treated at 2150°F(1175°C)/rapid air cooled) are shown in Fig. 3 by Larson-Miller presentation.
Mechanical Properties
Table 3 - Thermal Conductivity
Temperature Thermal Conductivity
°C Btu / ft h °FW/m °C°F
Table 6 - Dynamic Moduli
Temperature Dynamic TorsionalModulus
°C
20 68 11.6 81
100 212 12.9 90
200 392 14.6 102
300 572 16.3 114
400 752 17.9 126
500 932 19.5 137
600 1112 21.1 148
700 1292 22.9 161
800 1472 24.6 173
900 1652 26.3 184
1000 1832 27.9 196
Dynamic Young’sModulus
GPa 103 ksi°F GPa 103 ksi
20
100
200
300
400
500
600
700
800
900
1000
68
212
392
572
752
932
1112
1292
1472
1652
1832
205
202
195
190
183
177
168
161
153
145
135
29.7
29.3
28.3
27.6
26.5
25.7
24.4
23.3
22.2
21.0
19.6
80
78
75
72
70
66
62
60
56
53
49
11.6
11.3
10.9
10.4
10.2
9.6
9.0
8.7
8.1
7.7
7.1
°C 10-6 /°C °F 10-6 /°F
70 -200
-600
-1000
-1200
-1350
-1500
-1600
7.40
7.96
8.27
8.53
8.69
8.88
9.01
20 -100
-200
-300
-400
-500
-600
-700
-800
-900
-1000
13.3
14.0
14.3
14.5
14.7
15.1
15.7
16.0
16.3
16.7
°C
20
100
200
300
400
500
600
700
800
900
1000
°F
68
212
392
572
752
932
1112
1292
1472
1652
1832
µΩ cm
116
118
120
122
124
126
127
127
127
127
128
Ω circ mil / ft
698
710
722
734
746
758
764
764
764
764
770
Temperature Electrical Resistivity
Table 5 - Electrical Resistivity
Table 7 - Mechanical Properties of Sheet at Room Temperature
Figure 4. Comparative oxidation resistance of INCONEL alloy HX and
AISI 309 stainless steel
INCONEL® alloy HX
Corrosion ResistanceINCONEL alloy HX has outstanding oxidation resistance attemperatures up to 2200°F (1200°C). Test results at 1920and 2010°F (1050 and 1100°C) for 100 hours’ continuousexposure are shown in Fig. 4.
In a carburizing atmosphere of 2% methane plus 98%hydrogen flowing at 3 furnace volumes per hour for 100hours at 1800°F (980°C), samples of a representative heat of INCONEL allow HX showed an average weight gain of 7.7mg/cm².
The recommended heat treatment is 2150°F (1175°C),followed by rapid air cooling or water quenching.INCONEL alloy HX is normally supplied in this solution-heat-treated condition. For some applications it can be givenother treatments. Consult Special Metals for further details.
Hot and Cold Forming
INCONEL alloy HX can be readily cold formed using
slightly higher power than that used for austenitic stainlesssteels. It is best cold formed in the solution-heat-treatedcondition.
For hot forming, the alloy should be heated to a startingtemperature of 2150°F (1175°C). It should not be hotworked below 1800°F (980°C).
Welding
The alloy can be welded by metal arc, gas-tungsten-arc(T.I.G.), gas-metal-arc (M.I.G.) and submerged arc
processes. Welded surfaces must be thoroughly descaledand cleaned. Welding is best carried out flat since thefluidity of the alloy makes position welding difficult.
INCONEL welding electrode 117 and INCONEL filler metal 617 produce weldments that match or exceed basemetal high-temperature strength and oxidation resistance.Matched composition welding consumables (INCONELfiller metal HX and INCONEL welding electrode HX) areavailable.
Pre-heating and post-weld heat treatments are notnormally necessary. For the greatest corrosion resistance,however, solution-heat-treatment after welding may benecessary.
Machining
INCONEL alloy HX should be machined in the annealedcondition using carbide or high-speed steel tools and acopious supply of sulfur-free cutting fluid. Tools andmachines should be as rigid as possible to minimizedeflection and vibration. Speeds and feeds will be similar tothose for NIMONIC alloy 75.