Alloy X, 2.4665, UNS N06002, Inconel HX - Nickel Alloy

Alloy X, 2.4665, UNS N06002, Inconel HX, Hastelloy X according to UNS, ASTM B366, ISO 18274:2010

Hastelloy X, Alloy X, N06002 – description

Alloy X (N06002) is nickel-base solid-solution strengthened superalloy from the Ni-Cr-Fe-Mo family. It's main feature is exceptional creep-resistance and stress-rupture properties up to 1200°C, making it popular choice for gas turbine components in aircraft and ships. Another useful characteristics is it's excellent forgeability.

Hastelloy X contains nominal 47% Ni, 22% Cr, 18% Fe and 9% Mo with 0,6% W. Nickel improves carburization, nitridation and chlorination resistance. Chromium improves oxidation and carburization resistance. Molybdenum and Tungsten improve high-temperature creep-resistance and oxidation resistance.

Applications

Hastelloy X can in the most difficult working conditions and it is widely used for aicraft parts, such as jet engine tailpipes, afterburners, turbine blades and vanes. Because of it's high-temperature strength and oxidation resistance it is also used in many industrial furnace applications. It can also be found in fluid flow control applications where improved corrosion ressistance, temperature resistance and strength is required.

Alloy X - physical and mechanical properties

Hastelloy X has exceptional high-temperature strength, thanks mostly to solid-solution alloying, with a minor influence from carbide precipitation.

Room temperature physical and mechanical properties:

• Density: 8.23 g/cm³
• Electrical resistivity: 1.18 μΩ*m
• Magnetic permeability: 1.002 ; 16kA/m
• Melting temperature: 1260-1355 °C
• Poisson's ratio: 0.32
• Tensile strength: 785 MPa
• Yield strength: 360 MPa
• Young's modulus: 43 %
• Hardness: 89 HRB

Elastic modulus, measured in tension for sheet solution treated at 1175°C and rapidly cooled (average results):

• In ambient temperature: 196 GPa
• 100°C: 193 GPa
• 200°C: 185 GPa
• 300°C: 179 GPa
• 400°C: 172 GPa
• 500°C: 164 GPa
• 600°C: 158 GPa
• 700°C: 150 GPa
• 800°C: 143 GPa
• 900°C: 134 GPa
• 1000°C: 126 GPa

Coefficient of thermal expansion and temperature (linear):

• 26-100°C: 13.8 *10^-6m/(m*K)
• 26-500°C: 14.9 *10^-6m/(m*K)
• 26-600°C: 15.3 *10^-6m/(m*K)
• 26-700°C: 15.7 *10^-6m/(m*K)
• 26-800°C: 16.0 *10^-6m/(m*K)
• 26-900°C: 16.3 *10^-6m/(m*K)
• 26-1000°C: 16.6 *10^-6m/(m*K)

Specific heat and temperature:

• In ambient temperature: 486 J/kg*K
• 315°C: 498 J/kg*K
• 650°C: 582 J/kg*K
• 870°C: 699 J/kg*K
• 1095°C: 858 J/kg*K

Thermal conductivity and temperature:

• In ambient temperature: 9.7 W/(m*K)
• 100°C: 11.1 W/(m*K)
• 300°C: 14.7 W/(m*K)
• 600°C: 20.6 W/(m*K)
• 700°C: 22.8 W/(m*K)
• 800°C: 25.0 W/(m*K)
• 900°C: 27.4 W/(m*K)

Charpy's impact energy of solution treated and rapidly cooled Hastelloy X sheet:

• -196°C: 50 J
• -157°C: 60 J
• -78°C: 69 J
• -29°C: 76 J
• In ambient temperature: 73 J
• 815°C: 79 J

Stress-rupture data showing average rupture life strength for given temperature and test duration:

• Temperature 650°C (sheet):
  • T. duration 10 h: 462 MPa
  • T. duration 100 h: 331 MPa
  • T. duration 1000 h: 234 MPa
  • T. duration 10.000 h: 170 MPa
• Temperature 760°C (sheet):
  • T. duration 10 h: 221 MPa
  • T. duration 100 h: 155 MPa
  • T. duration 1000 h: 109 MPa
  • T. duration 10.000 h: 77 MPa
• Temperature 870°C (sheet):
  • T. duration 10 h: 117 MPa
  • T. duration 100 h: 73 MPa
  • T. duration 1000 h: 45 MPa
  • T. duration 10.000 h: 28 MPa
• Temperature 980°C (sheet):
  • T. duration 10 h: 45 MPa
  • T. duration 100 h: 26 MPa
  • T. duration 1000 h: 14 MPa
  • T. duration 10.000 h: 8 MPa
• Temperature 1090°C (sheet):
  • T. duration 10 h: 17 MPa
  • T. duration 100 h: 8 MPa
  • T. duration 1000 h: 4 MPa
  • T. duration 10.000 h: - MPa
• Temperature 1065°C (bar):
  • T. duration 10 h: 26 MPa
  • T. duration 100 h: 13 MPa
  • T. duration 1000 h: 7 MPa
  • T. duration 10.000 h: - MPa
• Temperature 1150°C (bar):
  • T. duration 10 h: 12 MPa
  • T. duration 100 h: 5 MPa
  • T. duration 1000 h: 2 MPa
  • T. duration 10.000 h: - MPa

Creep data showing average initiall stress to produce 0,5% creep in solutioned and rapidly cooled sheet:

• Temperature 650°C (sheet):
  • T. duration 10 h: 276 MPa
  • T. duration 100 h: 186 MPa
  • T. duration 1000 h: 121 MPa
• Temperature 760°C (sheet):
  • T. duration 10 h: 114 MPa
  • T. duration 100 h: 72 MPa
  • T. duration 1000 h: 45 MPa
• Temperature 870°C (sheet):
  • T. duration 10 h: 54 MPa
  • T. duration 100 h: 34 MPa
  • T. duration 1000 h: 21 MPa
• Temperature 980°C (sheet):
  • T. duration 10 h: 21 MPa
  • T. duration 100 h: 12 MPa
  • T. duration 1000 h: 6 MPa

Creep data showing average initiall stress to produce 1% creep:

• Temperature 650°C (sheet):
  • T. duration 10 h: 303 MPa
  • T. duration 100 h: 207 MPa
  • T. duration 1000 h: 145 MPa
• Temperature 760°C (sheet):
  • T. duration 10 h: 131 MPa
  • T. duration 100 h: 90 MPa
  • T. duration 1000 h: 62 MPa
• Temperature 870°C (sheet):
  • T. duration 10 h: 62 MPa
  • T. duration 100 h: 42 MPa
  • T. duration 1000 h: 25 MPa
• Temperature 980°C (sheet):
  • T. duration 10 h: 25 MPa
  • T. duration 100 h: 13 MPa
  • T. duration 1000 h: 7 MPa
• Temperature 900°C (bar):
  • T. duration 10 h: 55 MPa
  • T. duration 100 h: 37 MPa
  • T. duration 1000 h: 25 MPa
• Temperature 980°C (bar):
  • T. duration 10 h: 12 MPa
  • T. duration 100 h: 5 MPa
  • T. duration 1000 h: 2 MPa

Creep data showing average initiall stress to produce 2% creep in solutioned sheet:

• Temperature 650°C:
  • T. duration 10 h: 331 MPa
  • T. duration 100 h: 227 MPa
  • T. duration 1000 h: 155 MPa
• Temperature 760°C:
  • T. duration 10 h: 145 MPa
  • T. duration 100 h: 103 MPa
  • T. duration 1000 h: 74 MPa
• Temperature 870°C:
  • T. duration 10 h: 72 MPa
  • T. duration 100 h: 50 MPa
  • T. duration 1000 h: 30 MPa
• Temperature 980°C:
  • T. duration 10 h: 29 MPa
  • T. duration 100 h: 15 MPa
  • T. duration 1000 h: 8 MPa

Corrosion behaviour

N06002 is exceptionally resistant to oxidation and carburization even in very high temperature. It is resistant to aquenous solutions at ambient temperature.

Carburization resistance - the best performer among nickel and cobalt based alloys. Corrosion data generated in molten carbonate salt at 900°C for 504 h showed the total depth of corrosion attack of only 0.12mm.

Hot-corrosion resistance - very high. After 1000 h of testing in the temperature of 980°C, the sample lost only 0,4mm in diameter.

High-temperature static oxidation resistance - exceptional. After 1008h of testing in demanding conditions (1150°C in flowing air) the measured metal loss equaled only 0.11 mm.

High-temperature dynamic oxidation resistance - exceptional. Only Alloy 188 is better in this regard. Test involving 200 alternating 30 minutes cycles of alternating temperatures 540°C and 1095°C, totaling 100 h of testing. During this time the samples were oxidized by combustion products of A-640 aviation kerosene, using an air-to-fuel ratio of 40 to 1. The gas velocity was 390 km/h. The total depth of metal turned affected equaled only 55 μm.

High-temperature sulfidation resistence - adequate. Sulfidation test commenced at 980°C with sulfur partial pressure of 0.4 Pa and an oxygen partial pressure of 3x10^-12Pa resulted in more than 0.5mm total depth affected after 215 h of testing. Cobalt-base alloys do noticeably better in this regard.

Weldability

Weldability - the alloy belongs to group 43 according to ISO 15608. For brazing, p-number is equal 111, according to ASME/AWS.

Heat treatment and working

Alloy X has excellent forgeability. Recommended working and heat treatment parameters:

• Forging: 1095 °C
• First melting temperature: 1260 °C
• Precipitation temperature: 760 °C
• Batch annealing in bell-type furnaces:
  • Temperature: 1175°C
  • Duration: 15-30 min
  • Air cooling or Water quenching

• Continuous annealing:
  • Temperature: 1175°C
  • Duration: 1 h
  • Air cooling or Water quenching

We deliver this steel alloy as:

• Welding fittings according to ASTM B 366
• Sheets and plates according to ASTM B 435
• Bars according to ASTM B 619
• Seamless pipes according to ASTM B 622
• Welded pipes according to ASTM B 626
• Wires according to AMS 5798
• Forgings according to AMS 5754

Replacements, equivalents and other designations:

NAS HX, AMS 5390, AMS5587, AMS5754, ASTMA567-79, AMS AS7237, ASTM B345, B50A463A, N06002, Inconel alloy HX, Pytonet 680, SB 366 (CR HX), SB 366 (WPHX), Super-Invar 32-S, alloy X, AMS 5536, Altemp HX, Nickelvac HX, ERNiCrMo-2, UDIMET UDK, Hastelloy X, 2.4665, C74536, GH3536, H06002, H35360, K4536, K536, W53536, W56600, BNi6002, DNiCrMo-2, NCrMFB, NiCr21Fe18Mo9, Nistelle X Alloy Deloro, NW6002, Phyweld X