Greek Ascoloy (Alloy 418)

Stainless Steel 418, also known as 'Greek Ascoloy' (UNS 41800) is a heat resisting martensitic chromium-tungsten-nickel stainless steel. Greek Ascoloy is engineered for use in high-stress components up to 649'C. Typical heat treatment at 980?C -1010'C, followed by air or oil quenching (depending on material thickness) and 2-hour tempering twice at minimum 620'C gives Greek Ascoloy (Alloy 418) a superior creep strength and resistance to stress-corrosion cracking and tempering as compared to the general properties of 12% chromium stainless steels. Filler metal, UNS S41880, has extra molybdenum (0.50 max.), copper (0.50 max.) and tin (0.05 max.) for effective welding process.

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