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What’s up everyone? This is Michael with Michael Talks Metal back for more Nickel today. Specifically Inconel 625.

Today we will be taking a look at one of the more popular of the Nickel alloys known as Inconel 625 when produced by Special Metals Corporation or just “alloy 625” when produced by other manufacturers.

The UNS chemical composition designation is N06625 identifies the alloy regardless of the producing mill.

This alloy is a solid solution of its elements and cannot be strengthened by heat treatment. Cold working will result in increased strength. Heat treatment can remove any undesirable effects of cold work.

All the common commercial Nickel alloys are used in applications involving elevated temperatures, corrosion , or environments with both.  Alloy 625 has enhanced corrosion protection due to its Chromium, Molybdenum, and Columbium content

It has excellent seawater corrosion performance. Chemical processing equipment relies on the corrosion performance over a wide range of environments.

Applications requiring strength and oxidation resistance at temperatures up to 1800 degrees F in aerospace applications include  components of jet engine exhaust and thrust reversers.

Chemical composition:

Nickel (plus cobalt) ………………..    58 % minimum

Chromium ………………………………  20. 0  – 23.0 %

Iron ………………………………………..  5.0  % maximum

Molybdenum ……………………………  8.0 – 10.0 %

Columbium (plus Tantalum)………..  3.15-4.15 %

Carbon ……………………………………  0.10% maximum

Manganese ……………………………… 0.50 % maximum

Sulfur ………………………………………  0. 015% maximum

Phosphorus………………………………. 0.015% maximum

Silicon……………………………………… 0.50% maximum

Aluminum ………………………………… 0.40% maximum

Titanium……………………………………. 0.40% maximum

Typical Room temperature mechanical properties in the annealed condition are

Yield strength  60 to 95,000 psi  , Tensile strength  120 to 140,000 psi , elongation 30  to 60 %

Density is  point 305 pounds per cubic inch, about 7% more than iron and steel

Specifications:

Bars and forgings: 

ASTM B 446 and B 564  ;   ASME SB 446 and SB 564

AMS 5666

Sheet and plate:

ASTM B 443 ; ASME SB 443

AMS 5599, AMS 5869

Pipe and tube:

ASTM B 444, B 704,B 705, B 751 , B 775, B 829

ASME SB 444, SB 704, SB 705, SB 751 , SB 775, SB 829

AMS 5581

Each specification has requirements that can add to or restrict the chemical composition beyond what we have shown you today.  Other processing and testing requirements exist in the individual specifications.

So to  be sure that all requirements have been identified.  If you have seen me before you know what’s coming, so DON’T FORGET to…CHECK THE SPECS!!!!! See you next Thursday for another riveting discussion on Nickel.