The AMS 2700 standard is produced and controlled by SAE international. AMS refers to Aerospace Material Specification developed and published by SAE International, which before 2006 was known as the Society of Automotive Engineers. In March 2018, SAE issued a new revision, AMS 2700 F, which superseded AMS 2700 E issued in November 2011.
There are several significant differences between the current version (AMS 2700 F) and the previous version (AMS 2700 E):
Section 1.3.1 originally said nitric acid is to be used unless citric acid is specified. In the current version, either method can be used.
Section 3.2.1.2 clarifies the water immersion test requires the use of deionized or distilled water in the test itself.
Section 3.2.1.3.1 states that the copper sulfide test can now be run in advance using a test specimen of carbon or low alloy steel to ‘prove’ the process before production parts are run.
Section 3.2.2 clarifies that visual examination of parts should be done without magnification.
The last significant change removes appendix A, which described certain test methods used only when the purchaser specified.
Both standards describe and control how stainless steel (corrosion-resistant steel) can be made more stainless or corrosion resistant, allowing products to work in harsh conditions, to work longer and to be more reliable than they otherwise would be.