What’s the Difference? AL-6XN™ vs C-22

What’s the Difference? AL-6XN™ vs C-22

Nov 30, 2011

High temperatures, low pH, and aggressive chemicals call for a material that exhibits the high corrosion resistance that traditional stainless steel alloys fail to attain. There are many alloys available to address the corrosion issues; but what makes super-austenitic stainless steel alloy AL-6XN® and nickel alloy C-22 the favorite materials for highly corrosive environments? Are the properties more attractive, or is the availability of the material in the required forms more desirable? Is one better than the other? Both AL-6XN and C-22 have a face-centered cubic lattice structure and contain...

Cut the Hassle: Hastelloy C-22 vs. C-276

Cut the Hassle: Hastelloy C-22 vs. C-276

Jun 21, 2011

Material selection can be a difficult decision when you don’t understand the differences between two materials with almost the same cost. Have you ever asked for Hastelloy C-276 material and been recommended Hastelloy C-22 instead? Have you wondered what the difference is between them, and why one should be preferred over the other? Here are few reasons why C-22 is a better choice than C-276:

Cracked: The Secrets of Stress Corrosion Cracking

Cracked: The Secrets of Stress Corrosion Cracking

Mar 16, 2011

The most common corrosive species that has caused failures in chemical plant is the chloride ion. Chloride Stress Corrosion Cracking (CSCC) can occur in hot acid chloride solutions, sodium chloride/peroxide solutions, and seawater. Other neutral halides such as bromides, iodides and fluorides can also cause SCC of the 300 series stainless steels.

Discussion on the Material Selection for Santa’s Sleigh

Discussion on the Material Selection for Santa’s Sleigh

Dec 16, 2010

First, let me clarify. I am not proposing this discussion because I have any first-hand knowledge on this subject. I am certain that if Mr. Claus were to commission someone to construct new runners for his sleigh, he would do so under an alias—like Nick O. Las from The Jolly Old Elf Distribution Company, for instance. Anyway, where would Santa get money to pay for such a thing? He would have to barter. On that note...

When will I benefit from piping with AL-6XN material?

When will I benefit from piping with AL-6XN material?

Sep 22, 2010

1. When the product is corrosive to the piping system. Products containing chlorides and other salts can attack the tubing and fittings used to transport the products throughout a plant. Systems fabricated from 304 or 316 stainless steel can become leaky after prolonged contact with salty food and beverages, e.g. sports drinks and soy sauces. If the product is...

Stress Corrosion Cracking

Stress Corrosion Cracking

Sep 17, 2010

Unexpected or premature failure of chemical process equipment constitutes a serious hazard in terms of personnel, plant, and environmental safety. By weakening reliability, such failures also adversely affect productivity and profitability. Modern experience in chemical plants has been that failures due to environmental cracking are among the most serious of such problems, making up about 20 to 30% of all corrosion failures. The purpose of this article is to discuss in simple terms some of the pertinent information.