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Hey what’s up guys! This is Michael with Michlin Metals and guess what we’re gonna do today? We’re gonna talk about metal. Today’s topic is Incoloy. However, before we discuss that, let’s talk about subscribing. If you have seen any of my videos you know that MOST of you are NOT subscribed. In fact only about 8% of you are subscribed. Here’s a chart showing how many people are subscribed vs. not subscribed.  SEE! It’s just math. Moving on, hit that MMI button and just do it already.

So today we’re talking about Incoloy. Our topic covers four of the most popular of the series of Incoloy alloys and some other alloys of similar chemical compositions and applications. Incoloy is a trade name of Special Metals Inc and generic versions can not carry the Incoloy name.  This group is higher in Nickel than the stainless family and alloyed with enough Chromium and other elements so that iron makes up less than half of the composition.

Two main categories of alloy for their primary application. For corrosion applications,  higher in Nickel than comparable Stainless Steels, they can offer improved corrosion performance in some environments, particularly acidic. Many of these alloys are formulated to be used where high temperature strength and resistance to oxidation and other corrosion effects at temperature are important. Generally, these are used at temperatures above  the stainless steels and below the higher Nickel  Inconel and Hastelloys on a relative temperature scale.

Applications are found in chemical and petrochemical processing equipment, industrial furnace components and heat exchangers.

First up is Incoloy 800 … just Alloy 800 in generic form. There are three variations that accentuate certain properties of the alloy, Basic composition 32% Ni, 21% Cr, and a minimum of 39.5% Fe is common to all three of the variations.  Small variations in carbon, aluminum and titanium differentiate three types.

800 has the chemistry designation UNS N08800.  800H is UNS N08810 and 800HT UNS N08811. Mainly used for high temp applications.

Second is Incoloy 825   or generic “Alloy 825” Basic composition is 42% Ni, 21.5% Cr, 3% Mo, 2% Cu and a minimum of 22% Fe is designated UNS N08825.

This alloy is resistant to stress corrosion cracking and many reducing acid environments

Third alloy is Incoloy 925…  and you guessed it…..alloy 925 for a generic producer.

Basic composition is 44% Ni, 21% Cr, 3%Mo, 2% Cu, and 22% minimum Fe.

UNS designation is N09925. Additions of Al and Ti make this an alloy that can be strengthened by an age hardening heat treatment and maintains good strength characteristics up to 1250 degrees F.

Our fourth alloy is Incoloy 20  or Alloy 20 in a common generic.Nominal composition is  35% Ni, 20% Cr, 3.5% Cu, 2.5% Mo and the balance iron.  Its UNS designation is N08020.

This alloy is resistant to  stress corrosion and many acid environments.

Trade name alloy RA 330  or UNS N08330 designates a basic chemistry of 35.5% Ni,18.5% Cr,1.1% Si, balance Fe.  Mainly used for high temperature applications.

Trade name alloy RA 333  contains roughly 44.5% Ni, 25.5% Cr, 3.2% Cobalt, 3.2 % Mo,3.2 % and the balance Fe.  UNS designation is  N06333.  Used for high temperature applications.

Applications are complex and the detailed requirements are in the specifications that apply. So as I always say – CHECK THE SPEC!!!

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