ASTM F519 Hydrogen Embrittlement Testing

ASTM F519 has been widely used by the aerospace industry for decades to help prevent hydrogen embrittlement from plating and coating operations. High-strength test coupons are plated monthly or more often, then tested by F519 to ensure the operations are not embrittling. The test can be performed using a 200-hour sustained load or using the 20-hour rising step load test, which is our preference.

Where does the 75% threshold in F519 come from?

The 75% threshold value used in ASTM F519 comes directly from the foundational work of Troiano and is based on extensive experimental testing. The testing determined that loading a notched tensile sample at 75% of its maximum load is equivalent to holding a smooth tensile sample at 100% of it's maximum load; so essentially placing the part in the equivalent of 100% load and holding for a specified time.

How long do samples need to be held for ASTM F519?

Extensive experimental testing has demonstrated the equivalence of testing by the sustained load and the incremental load methods. Therefore the faster incremental method from annex A3 is recommended for most circumstances.

ASTM F1624 Hydrogen Embrittlement Testing

For more advanced testing of actual parts, ASTM F1624 is the preferred method. Our lab has been at the forefront of development of the F1624 method and we operate more bend and tensile testing frames than anyone else globally. For more information or a quote, reach out to us: