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.

Does AL-6XN Meet Controlled Sulfur Requirements of ASTM A270-S2?

Does AL-6XN Meet Controlled Sulfur Requirements of ASTM A270-S2?

Feb 4, 2011

Question: If I purchase AL-6XN alloy (N08367) tubing or fittings to the ASTM A270-S2 specification, will they meet the controlled sulfur requirements? Many end users in pharmaceutical industry require the ASTM A270-S2 (pharmaceutical quality) tubing for their application. However, sulfur requirements are commonly misunderstood, and the ASTM A270 specification...

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...

Stainless Steel Prices On the Rise

Stainless Steel Prices On the Rise

Dec 13, 2010

After a decline in the summer, stainless and raw material prices are increasing. The volatility comes from both the supply of materials like nickel, nickel pig iron, and the general state of the global economy. Currently the projected December surcharge for 304 and 316 is back to the May-June levels. Our outlook is a flat or slightly increasing January with a correction predicted for late spring...

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...

Does Sulfur Content Matter?

Does Sulfur Content Matter?

Jul 6, 2010

Have you ever experienced weld puddle shift? Have you ever wondered why ASME BPE limits sulfur for tube and fittings to .005% to .017%?  Take a look at these videos, and you’ll understand why. Clip 1 shows matched sulfur of .008% on both weld pieces. Clip 2 shows mismatched sulfur of .002% welded to .014%. Notice how the weld pool tracks off-center of...