The ASTM A279 method defined a rigorous process for conducting immersion tests to guarantee that results were reproducible and reliable. The test generally involved the following steps:
The test is conducted at a specified, constant temperature (often boiling or a tightly controlled ambient temperature). Exposure times typically range from 24 to 48 hours per cycle, often repeated over multiple periods to identify changing corrosion rates over time. 5. Post-Test Evaluation
: Must be solution annealed by heating to a high temperature range followed by rapid water quenching or air cooling.
The standard was issued on , and was an 8-page document written in English. It was, at its core, a laboratory procedure that provided a standardized way to measure how well stainless steel resisted corrosion when fully submerged in a corrosive environment. It would have detailed critical parameters like: Astm A279 Pdf
Corrosive agents (often acidic or saline solutions) were strictly controlled for temperature, aeration, and concentration.
ASTM A279 was a significant contributor to the standardization of corrosion testing in the 20th century. While it is now a withdrawn standard, its legacy continues through modern practices like ASTM G31. Understanding these methodologies ensures that stainless steel components perform reliably under harsh, liquid-exposed conditions.
For those requiring the , it is best sourced through historical document repositories, such as those listed in All-Standards or Nimonik , to understand the methodology used in past evaluations. The ASTM A279 method defined a rigorous process
However, since the standard was withdrawn in 2010, it may not be applicable for current designs or projects. It's essential to verify the current edition of the standard or use a more recent replacement standard, such as ASTM A514/A514M.
: It was discontinued in the late 20th century. In many cases, corrosion testing for stainless steels shifted toward more specific standards like ASTM G31 (Standard Guide for Laboratory Immersion Corrosion Testing of Metals). Current Alternatives :
Understanding ASTM A279: Total Immersion Corrosion Testing of Stainless Steels It was, at its core, a laboratory procedure
ASTM A269 specifies strict variations for wall thickness and outside diameter. For example, standard tubes generally permit a wall thickness variation of , while smaller tubes (under 1/2 inch) may have variations up to ±15% if they cannot be drawn over a mandrel. 5. Industry Applications
After the test, the samples were cleaned to remove corrosion products without removing base metal.