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standard & specification

Duplex Steel S31803, S32250, S32750, etc.

The most used Duplex Stainless Steel are the SAF2205 ( UNS S31803, 00Cr22Ni5Mo3N ) (22% Chromium, 5% Nickel) and SAF 2507 ( UNS S32750, 00Cr25Ni7Mo4N ) (25% Chromium, 7% Nickel); the 2507 is also known as "Super Duplex" due to its higher corrosion resistance. And UNS S32304(00Cr23Ni4N SAF 2304) is also in Magvant's product program..

Material StandardASTM A 789, ASTM A790
Manufacturing Process: Seamless or welded
Comparison of material of main Duplex Stainless steel tubes (steel pipes) in Different Countries

USA China France Germany Japan Sweden UK
S31803 00Cr22Ni5Mo3N  UR45N, UR45N+ W-Nr.1.4462 DP8 SAF2205 (SS2377)  
S31500 00Cr18Ni5Mo3Si2    W-Nr.1.4417 DP1 3RE60 (SS.2376)  
S32550 00Cr25Ni6Mo3CuN UR52N+ W-Nr.1.4507     Ferralium255
S31200 00Cr25Ni6Mo2N          
00Cr22Ni5Mo3N  UR 47N        
S31260 00Cr22Ni5Mo3WcuN   W-Nr.1.4501 DP3(SUS329J2L)   Zeron100
S32304    UR35N W-Nr.1.4362 DP11 SAF2304 (SS.2327)  
S32750    UR47N+ W-Nr.1.4410   SAF2507  
S32900 00Cr26Ni5Mo2   W-Nr.1.4460 DP6 (SUS329J1) 10RE51 (SS2324)  

UNS S31803
S31803 is a widely used duplex steel of stainless steel tube, combining high strength and corrosion resistance in various organic acids, inorganic acids, aggressive cooling waters and hydrousH2S/NaCl mixtures. With a near equal mix of austenite and ferrite, they give yield strength 30% higher and tensile strengths marginally higher than comparable nitrogen-containing austenitics. High resistance to general corrosion and specifically topitting and crevice corrosion. Their resistance to stress-corrosion cracking in neutral chlorides is superior to that of the austenites. In high chloride acidic or moderately sour environments where hydrogen or sulphide stress cracking is more likely, higher alloyed austenitics need also to be considered. Impact values are high and transition temperatures of base materials vary around -50°C. However, the proportion and orientation of ferrite in welds and base materials may significantly affect toughness at subzero temperatures. Exposure to moderate and high temperatures and less rapid cooling may cause embrittlement.

UNS S32760
UNS S32760 is a super ferritic-austenitic grade of steel tubes (steel pipes) with high mechanical properties and superior corrosion resistance. Besides the ferriticaustenitic structure, UNS S32760 has an excellent resistance to pitting and crevice corrosion and is therefore particularly suitable for sea water applications and for process systems on off-shore platforms, respectively in all situations where there is a risk of stress corrosion. The high tensile properties are twice comparing with TP 316 L stainless steel. The service range is between - 50° C up to + 275° C.

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