ASTM A789 /A789M Stainless Steel tubes Grades S31803, S32205, S31500, S32550, S31200, S31260, S32001, S32304, S39274, S32750, S32760, S32900, S32950, S39277, S32520, S32906. ASTM A789 /A789M Stainless tubes shall be made by the seamless or welded process with no filler
S31803 (COLDUPLEX) is a standard grade of duplex stainless steel based on 22% chromium and 5% nickel. Often referred to as Alloy 2205, this material is the most widely used duplex grade due to its combination of very good general corrosion resistance and high strength. S31803 has a superior corrosion resistance to austenitic grades such as 316 in …
Because of the high Mo and N contents, the PRE number for SAF 2205 is significantly higher than what would be the case with lower Mo and N contents which are still within the limits of UNS S31803. Nevertheless, based on practical experience, SAF™ 31803 can be used at considerably higher temperatures and chloride contents than ASTM 304 …
Both S31803 and S32205 belong to the duplex 2205 family, which means they comprise almost equal parts austenite and ferrite. Secondly, they are both extremely strong and durable alloys. S31803 and S32205 are both incorporated into some of the more hard-wearing and inhospitable production processes requiring materials that can …