We are professional A182-F61 Valve Seat Rings (UNS S32550, 1.4507, Ferralium 255) from china



ERRALIUM 255 is finding many cost effective applications in the chemical, marine, metallurgical, municipal sanitation, plastics, oil and gas, petrochemical, pollution control, wet phosphoric acid, paper making and metalworking industries.
Called "super" because it is more alloyed than ordinary stainless steels and has superior corrosion resistance, FERRALIUM 255 is being used in areas where conventional stainless' are inadequate or, at best marginal. One good example s in the paper industry which was hit with an epidemic of corrosion problems when environmental laws forced recycling of process liquids In closed systems, chemicals such as chlorides can build up to highly corrosive concentrations over time. Paper makers have found that ordinary stainless equipment, which had previously given good service, was no longer adequate for many applications.
FERRALIUM 255 is a duplex alloy with a high strength to weight ratio with superior abrasion and cavitation resistance. Resistance to chloride SCC, as well as crevice corrosion and pitting. Good ductility with a high fatigue strength in marine applications. Twice the yield strength of Alloy 20, and stronger than Duplex 2205. An excellent 40°C critical pitting temperature (ASTM G48-Method A), twice that of Alloy 2205. 
Principal Features of Alloy 255 Compared To 300 Series Austenitic Stainless Steels
Superior Corrosion Resistance
Pitting
Crevice Corrosion
Chloride Stress Corrosion Cracking
General Corrosion In Many Environments
Good Ductility
High Strength-To-Weight Ratio
High Fatigue Strength In Marine Environments
Superior Abrasion and Cavitation Erosion Resistance
High Mechanical Strength - (over twice the yield strength of austenitic stainless steels)
Good Fabricability