Incoloy 825 Vs Inconel 625

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Incoloy 825 Vs Inconel 625

Compare the difference between chemical and mechanical properties

Inconel is a nickel based superalloy. According to the amount of nickel present in the alloy and by considering many other parameters, we can grade Inconel differently. And the two such grades are Inconel 625 and Incoloy 825. The main difference between the two is that Inconel 625 contains a high amount of nickel as compared to Incoloy 825.

What is Inconel 625?

Inconel 625 contains a high amount of nickel than other grades of Inconel, and it is nickel-based superalloy. At higher temperature it has high strength and great resistivity. Against corrosion and oxidation it shows great protection. In nuclear and marine applications these specific advantages make it very useful.

Inconel 625 alloy service temperature ranges from cryogenic to 982°C. The alloy high strength is due to the stiffening effect of niobium and molybdenum, which locates in the nickel-chromium matrix. Therefore Inconel alloy does not need precipitation hardening treatments. Inconel 625 is an excellent choice for seawater applications due to high tensile strength, high corrosion-fatigue strength and resistance to chloride-ion stress-corrosion cracking. Apart from this, it exhibits excellent toughness and ductility at low temperature.

Inconel Alloy 625 Chemical Composition

Inconel Element (% by mass)
Ni Cr Fe Mo Nb Co Mn Cu Al Ti Si C S P B
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

Alloy 625 Equivalent Material

STANDARD WERKSTOFF NR. UNS GOST AFNOR JIS BS EN OR
Inconel 625 2.4856 N06625 ХН75МБТЮ NC22DNB4M NCF 625 NA 21 NiCr22Mo9Nb ЭИ602

Inconel 625 Mechanical Properties

  Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
625 8.4 g/cm3 1350 °C (2460 °F) Psi – 135,000 , MPa – 930 Psi – 75,000 , MPa – 517 42.5 %

What is Incoloy 825?

When compared to other Inconel grades, Incoloy 825 contains a moderate amount of nickel and is a nickel based superalloy. It consist a higher melting point but has low yield strength and a low tensile strength. And it contains chromium and nickel along with titanium, molybdenum and copper. It specifically provides an exceptional corrosion resistance to aqueous corrosion. Beside this, it exhibits oxidizing resistance and reducing acids such as phosphoric and sulfuric acids. 

Difference between Inconel 625 and Incoloy 825

 

Inconel 625

Incoloy 825

Defination

It is nickel based superalloy which contains a high amount of nickel than any other grade of Inconel

It is nickel based superalloy which contains a moderate amount of nickel as compared to any other grade of Inconel

Nickel Content

It contains about 58% of nickel

It contains about 36-48% of nickel

Tensile Strength

It has very high tensile strength and yield strength

It has comparatively low tensile strength and yield strength

Elongation

It's elongation is about 42.52%

It's elongation is about 30%

Incoloy 825 Material Composition

Alloy Ni Cr Fe Mb Ti Cu Mn C S Al Si
Incoloy 825 38.0 – 46.0 19.5 – 23.5 22.0 min 2.5 – 3.5 0.6 – 1.2 1.5 – 3.0 1.0 max 0.05 max 0.03 max 0.2 max 0.5 max

Alloy 825 Equivalent Material

ALLOY WERKSTOFF NR. UNS GOST AFNOR JIS BS EN OR
Incoloy 825 2.4858 N08825 ЭП703 NFE30C20DUM NCF 825 NA 16 NiCr21Mo XH38BT

Alloy 825 Mechanical Properties, Density, Melting Point, and Tensile Strength

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
8.14 g/cm3 1400 °C (2550 °F) Psi – 80,000 , MPa – 550 Psi – 32,000 , MPa – 220 30 %

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