Crown ER 410 is a martensitic stainless steel welding wire. It is often used for welding or repairing 12% chromium, air-hardenable stainless steels like types 410, 416, 420, 431 and cast C-15. Crown ER 410 is also used for overlays on carbon steels and low-alloy steels to resist corrosion and erosion. Crown ER 410 has a higher hardness than “300 series” stainless steels and is therefore used where resistance to high abrasion is needed. It is often used in valve seats for better galling resistance. To obtain adequate ductility, preheat and post-weld heat-treatment are required.