Difference Between Inconel and Nimonic

INCONEL® and NIMONIC® alloys both can perform better in high temperature such as automotive industry, Aerospace etc.High-performance vehicles and motor sports engines use INCONEL® alloys, which is particularly suited to exhaust couplings and lower power vehicles use INCOLOY® alloy 864 as hot gas containment tubing.  INCONEL® alloy X-750 is used to make engine valve springs. Inconel is a High nickel alloy which is suitable to use in ignition systems, sensors, safety devices and electrical and electronic switch gear.

Inconel

Inconel is a family of austenitic nickel-chromium-based superalloys while Nimonic alloys typically consist of more than 50% nickel and 20% chromium with additives such as titanium and aluminium. Nimonic & Inconel are registered trademark of Special Metals Corporation.

Inconel Composition

Inconel Element (% by mass)
Ni Cr Fe Mo Nb Co Mn Cu Al Ti Si C S P B
600 72.0 14.0–17.0 6.0–10.0 1.0 0.5 0.5 0.15 0.015
617 44.2–56.0 20.0–24.0 3.0 8.0–10.0 10.0–15.0 0.5 0.5 0.8–1.5 0.6 0.5 0.15 0.015 0.015 0.006
625 58.0 20.0–23.0 5.0 8.0–10.0 3.15–4.15 1.0 0.5 0.4 0.4 0.5 0.1 0.015 0.015
690 59.5 30 9.2 0.35 0.01 0.02 0.35 0.019 0.003
718 50.0–55.0 17.0–21.0 balance 2.8–3.3 4.75–5.5 1.0 0.35 0.2–0.8 0.65–1.15 0.3 0.35 0.08 0.015 0.015 0.006
X-750 70.0 14.0–17.0 5.0–9.0 0.7–1.2 1.0 1.0 0.5 0.4–1.0 2.25–2.75 0.5 0.08 0.01

Inconel alloys

Alloys of inconel include:

  • Inconel 600: Solid solution strengthened
  • Inconel 601
  • Inconel 625: Acid resistant, good weldability. The LCF version is typically used in bellows.
  • Inconel 690: Low cobalt content for nuclear applications, and low resistivity
  • Inconel 713C: Precipitation hardenable nickel-chromium base cast alloy
  • Inconel 718: Gamma double prime strengthened with good weldability
  • Inconel 751: Increased aluminium content for improved rupture strength in the 1600 °F range
  • Inconel 792: Increased aluminium content for improved high temperature corrosion properties, used especially in gas turbines
  • Inconel 939: Gamma prime strengthened to increase weldability

Inconel Equivalent Grades

STANDARD WERKSTOFF NR. UNS GOST AFNOR JIS BS EN OR
Inconel 600 2.4816 N06600 МНЖМц 28-2,5-1,5 NC15FE11M NCF 600 NA 13 NiCr15Fe ЭИ868
Inconel 601 2.4851 N06601 XH60BT NC23FeA NCF 601 NA 49 NiCr23Fe ЭИ868
Inconel 617 2.4663 N06617            
Inconel 625 2.4856 N06625 ХН75МБТЮ NC22DNB4M NCF 625 NA 21 NiCr22Mo9Nb ЭИ602
Inconel 690 2.4642 N06690            
Inconel 718 2.4668 N07718            
Inconel 725 - N07725            
Inconel X-750 2.4669 N07750            

Inconel Melting Point, Density and Tensile Strength

  Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
600 8.47 g/cm3 1413 °C (2580 °F) Psi – 95,000 , MPa – 655 Psi – 45,000 , MPa – 310 40 %
601 8.1 g/cm3 1411 °C (2571 °F) Psi – 80,000 , MPa – 550 Psi – 30,000 , MPa – 205 30 %
617 8.3g/cm³ 1363°C ≥ 485 MPa ≥ 275 MPa 25 %
625 8.4 g/cm3 1350 °C (2460 °F) Psi – 135,000 , MPa – 930 Psi – 75,000 , MPa – 517 42.5 %
690 8.3g/cm³ 1363°C ≥ 485 MPa ≥ 275 MPa 25 %
718 8.2 g/cm3 1350 °C (2460 °F) Psi – 135,000 , MPa – 930 Psi – 70,000 , MPa – 482 45 %
725 8.31 g/cm3 1271°C-1343 °C 1137 MPa 827 MPa 20 %
X-750 8.28 g/cm3 1430°C 1267 MPa 868 MPa 25 %

Nimonic

Nimonic grades:

  • Nimonic 75
  • Nimonic 81
  • Nimonic 86
  • Nimonic 80/80A
  • Nimonic 90
  • Nimonic 105
  • Nimonic 115
  • Nimonic 263
  • Nimonic 901

Nimonic Equivalent Grades

STANDARD WERKSTOFF NR. UNS
Nimonic® 75 2.4951 N06075
Nimonic® 80 2.4952 N07080
Nimonic® 81    
Nimonic® 86    
Nimonic® 115 2.4636  
Nimonic® 263 2.4650 N07263
Nimonic® 901 2.4662 N09901

Nimonic Chemical Composition

Grade Ni Cr Fe P Cu Al Ti C Mn Si Co  
Nimonic® 75 Bal. 19-22 Max 1.0 Max 0.015 Max 0.2 Max 0.15 0.15-0.35 Max 0.12 Max 0.70 Max 0.80 - Max 0.02
Nimonic® 81 63 ≤30 ≤1.0 - - 0.9 1.8 - - - ≤2 -

Grade Ni Cr Mo Fe Cu Al Ti Zr Mn Si Co C Sulfur, S Boron, B
Nimonic® 105 51 14-15.7 4.50-5.50 1 0.20 4.50-4.90 0.90-1.50 0.15 1 1 18-22 0.12 0.010 0.0030-0.010

Grade Al B C Cr Co Cu Fe Mn Ni P Si S
Nimonic 80 1 – 1.8 0.008 max 0.1 max 18 – 21 0.2 max 0.2 max 3 max 1 max Balance 0.045 max 1 max 0.015 max

Grade Ni Co Cr Mo Ti Fe Mn Al Si Cu C B S
Nimonic 263 49 19-21 19-21 5.60-6.10 1.90-2.40 0.70 0.60 0.60 0.40 0.20 0.040 – 0.080 0.0050 0.0070

Weight% Ni Cr Mo Ti Co Cu Mn Si Al C S Fe
Nimonic Alloy 901 42.5 12.5 5.75 2.9 1.0 max 0.5 max 0.5 max 0.4 max 0.35 max 0.1 max 0.03 max Bal

Weight % Ni Cr Co Ti Al C Si Cu Fe Mn B S Zr Pb
Alloy 90 Bal 18-21 15-21 2-3 1-2 0.2 max 1.0 max 0.2 max 1.5 max 1.0 max 0.02 max 0.015 max 0.15 max 0.0020 max

Nimonic Melting Point, Density and Tensile Strength

Grade Density Melting Point
Nimonic 75 8.4 g/cm3 1374°C-1420 °C
Nimonic 80 0.295 2450 °F
Nimonic 81 8.06 gm/cm3 1357°C
Nimonic 86 8.54 g/cm³
1327°C
Nimonic 105 8.01 g/cm³ 1327°C
Nimonic 115 7.85 g/cm³ 1304°C
Nimonic 263 0.302 lb/in³ 2372-2471°F

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