What is the recommended post-weld heat treatment for ASTM A285 GrC

ASTM A285 GrC is a low to intermediate tensile strength carbon steel plate used in pressure vessel applications. The recommended post-weld heat treatment (PWHT) for ASTM A285 GrC depends on the thickness of the plate and the specific welding process used.

For butt welds made using shielded metal arc welding (SMAW), gas tungsten arc welding (GTAW), or gas metal arc welding (GMAW) with solid wire electrode, a PWHT is typically not required for plate thicknesses up to 1 inch. However, for thicker plates, a PWHT at a temperature of 1100°F to 1200°F for 1 hour per inch of thickness is recommended to relieve any residual stresses that may have developed during welding.

For fillet welds and certain other types of welds, a PWHT at a temperature of 1100°F to 1200°F for 1 hour per inch of thickness is recommended for all thicknesses to ensure adequate stress relief.

It's important to note that the specific PWHT requirements for ASTM A285 GrC may vary depending on the applicable code or standard being used for the pressure vessel in which the steel will be used. It's always best to consult the relevant code or standard and work with a qualified welding engineer to determine the appropriate PWHT for your specific application.