How to repair defects in 18/10L stainless steel of nitric acid grade

Thread Content

For various defects in nitric acid-grade 18/10L stainless steel, and taking into account its requirements for resistance to nitric acid corrosion, the following repair methods can be employed: 1. Repair of crack-related defects – Pretreatment before welding: Tap the cracked area to eliminate residual stress; drill stop cracks 10–50 mm away from both ends of the crack, with a depth equal to that of the groove to be created later, so as to form a suitable groove. Repair welding procedure: Use A122 welding rods that are resistant to cracking and corrosion. Dry the welding rods at 150°C for 1–2 hours. When performing multi-layer welding, remove slag after each layer is welded. Allow the weld seam to cool to 850°C before undergoing stress-relief heat treatment to eliminate residual stresses from processing and welding, thereby preventing stress corrosion cracking in the future.