Hastelloy Vs Monel

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Hastelloy Vs Monel

Comparison between Hastelloy and Monel alloy

What is hastelloy?

Hastelloy is one of the best nickel-based steel alloys which provide high corrosion resistance. Compared to traditional alloys, hastelloys offers unique combination of properties that provide them with significantly stronger capabilities of corrosion resistance. Hastelloy family of chromium/ nickel/molybdenum alloys at elevated temperatures are ideal for use in highly aggressive chemical environments.

Hastelloy Applications

Hastelloy is useful in many different applications in the below listed categories

  • Chemical Industries
  • Oil & Gas Industries
  • Pharmaceutical Industries
  • Petrochemical Industries
  • Geothermal
  • Water Desalination
  • Sea Water
  • LNG (Liquefied Natural Gas)
  • Nuclear Power
  • Mining
  • Biomass
  • Solar Power

Hastelloy Properties

Hastelloy is a nickel-molybdenum alloy that is especially suited to handle reducing acids at concentrations and high temperature. Since it is not affected to grain-boundary carbide precipitation following welding It can be used in the welded condition.

Hastelloy Chemical Composition

Alloy Carbon Cobalt Chromium Molybdenum Vanadium Tungsten Aluminium Copper Niobium Titanium Iron Nitrogen Other%
B 0.10max 1.25max 0.60max 28.00max 0.30max - - - - - 5.50max Bal Mn 0.80; Si 0.70
B2 0.02max 1.00max 1.00max 26.0-30.0 - - - - - - 2.00max Bal Mn 1.0, Si 0.10
C 0.07max 1.25max 16.00max 17.00max 0.30max 40.0max - - - - 5.75max Bal Mn 1.0; Si 0.70
C4 0.015max 2.00max 14.0-18.0 14.0-17.0 - - - - - 0.70max 3.00max Bal Mn 1.0 ; Si 0.08
C276  0.02max 2.50max 14.0-16.5 15.0-17.0 0.35max 3.0-4.5 - - - - 4.0-7.0 Bal Mn 1.0; Si 0.05
G 0.05max 2.50max 21.0-23.5 5.5-7.5 - 1.00max - 1.5-2.5 1.7-2.5 - 18.0-21.0 Bal Mn 1.0-2.0; P0.04; Si 1.0; 
N 0.06max 0.25max 7.00max 16.50max - 0.20max - 0.10max - - 3.00max Bal Mn 0.40; Si 0.25; B 0.01
S 0.02max 2.00max 15.50max 14.50max 0.60max 1.00max 0.20max - - - 3.00max Bal Mn 0.50; Si 0.40; B0.0009; La 0.02
W 0.06max 1.25max 5.00max 24.50max - - - - - - 5.50max Bal Mn 0.050; Si 0.50
X 0.10max 1.50max 22.0max 9.00max - 0.60max - - - 18.50max - Bal Mn 0.6; Si 0.60

Hastelloy Mechanical Properties

Hatelloy Alloy Tensile Strength Yield Strength (0.2%Offset) Density Melting Point Elongation
Hastelloy C22 Psi – 1,00,000 , MPa – 690 Psi – 45000 , MPa – 310 8.69 g/cm3 1399 °C (2550 °F) 0.45
Hastelloy C276 Psi – 1,15,000 , MPa – 790 Psi – 52,000 , MPa – 355 8.89 g/cm33 1370 °C (2500 °F) 0.4
Hastelloy B2 Psi – 1,15,000 , MPa –760 Psi – 52,000 , MPa – 350 9.2 g/cm3 1370 °C (2550 °F) 0.4
Hastelloy B3 Psi – 1,15,000 , MPa –760 Psi – 52,000 , MPa – 350 9.2 g/cm3 1370 °C (2550 °F) 0.4
Hastelloy C4 783 365 8.64 g/cm3 1350-1400 °C 0.55
Hastelloy X 655 MPa 240 MPa 8.22 g/cm³ 1355°C 0.35

Hastelloy Equivalent Grades

Alloy WNR UNS GOST JIS EN
C22 2.4602 N06022 - NW 6022 NiCr21Mo14W
C276 2.4819 N10276 ХН65МВУ NW 0276 NiMo16Cr15W
B2 2.4617 N10665 - - -
B3 2.46 N10675 - - -
C4 2.461 N06455 - - -
C-22 - N07022 - - -
C2000 2.4675 N06200 - - -
X 2.4665 N06002 - - -

What is Monel?

Monel is primarily composed of 52-67% of nickel and copper, with little amount of silicon, manganese, iron and carbon. It is a group of nickel alloy and it is stronger than pure nickel. Monel alloys are corrosion resistant by many means, including fast flowing seawater. It can be readily fabricated by cold and hot working, welding and machining.

Monel Applications

Monel is useful in many different applications in the below listed categories

  • Aerospace applications
  • Marine applications
  • Musical instruments
  • Oil production and refining

Monel Properties

Monel work-hardens very quickly is very difficult to machine, as compared to steel and monel. It requires to be worked and turned at low feed rates and slow speeds. It is usually used in highly corrosive conditions applications. As compared to stainless steel, monel is much expensive. Monel alloy 400 is considerable for its toughness, which is maintained over a sustainable range of temperatures.  At subzero temperature monel alloy 400 provides excellent mechanical properties. Its hardness and strength increases with impact resistance and slight impairment of ductility. Even when it is cooled to the temperature of liquid hydrogen it does not undergo a ductile-to-brittle transition.

Monel Chemical Composition

Monel Grade Copper Aluminum Titanium Iron Manganese Silicon Nickel
Monel 400 28–34 - - 2.5 max 2.0 max 0.5 max 63 min
Monel 401 28–34 - - 2.5 max 2.0 max - 63 min
Monel 404 Rem 0.05 max - 0.5 max 0.1 max 0.1 max 52–57
Monel K-500 27–33 2.3–3.15 0.35–0.85 2.0 max 1.5 max 0.5 max 63 min
Monel 405 28–34 - - 2.5 max 2.0 max 0.5 max 63 min

Monel Mechanical Properties

Alloy Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
Alloy 400 8.8 g/cm3 1350 °C (2460 °F) Psi – 80,000 , MPa – 550 Psi – 35,000 , MPa – 240 0.4
Alloy 401 8.8 g/cm3 1350 °C (2460 °F) Psi – 80,000 , MPa – 550 Psi – 35,000 , MPa – 240 0.4
Alloy 404 8.91 g/cm3 1300-1350ºC Psi - 95,000, Mpa 655 Psi -75,000, Mpa 517 0.35
Alloy K500 8.44 g/cm3 1350 °C (2460 °F) Psi – 160000 , MPa – 1100 Psi – 115000 , MPa – 790 0.2

Monel Equivalent Grades

Standard ASTM/ AISI WNR UNS AFNOR JIS EN BS
400 B 127, B 164 2.4360, 2.4361 N04400 NU-30M  NW 4400  NiCu30Fe NA 13
401 - 1.7471 N04401 NU-30M  NW 4401  NiCu30Fe NA 13
404 - 2.4867 N04404 - - - -
450 - - - - - - -
K500 B 825 2.4375 N05500 - - - -
R405 B 164 - N04405 - - - -

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