ASTM A790 Big Duplex Steel Pipe 6000mm Stainless Seamless Cold Rolled Pipe
ASTM A790 Big Pipe , Duplex Steel Pipe , Stainless With Seamless , Cold Rolled
| Grade | C | Si | Mn | P | S | Cr | Ni | Mo | N |
| max | max | max | max | max | |||||
| UNS S32750 | 0.03 | 0.8 | 1.2 | 0.03 | 0.015 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.32 |
| UNS S31803 | 0.03 | 1 | 2 | 0.02 | 0.02 | 21.0-23.0 | 4.5-6.5 | 2.5-3.5 | 0.08-0.20 |
| UNS S31500 | 0.03 | 1 | 1.2-2.0 | 0.03 | 0.03 | 18.0-19.0 | 4.5-5.5 | 2.5-3.5 | 0.05-0.10 |
| Physical Properties | ||||
| Grade | Y.S.MPa min | T.S.Mpa min | Elongation % | Hardness HRC |
| UNS S32750 | 550 | 800 | 15 | 20 |
| UNS S31803 | 450 | 620 | 25 | 20 |
| UNS S31500 | 440 | 630 | 30 | 20 |
Most of 2507 duplex steel pipes are produced by cold drawn method . The alloy has higher yield
strength and lower ductility than austenitic steels so fabricators may fid that higher forming forces , increased radius of bending , and increased allowance for springback are necessary . Deep drawing , stretch forming , and similar processes are more difficult to perform on 2507 than on an austenitic
stainless steel . When forming requires more than 10% cold deformation , a solution anneal and quench
are recommended . And finished cold drawn duplex steel pipe , manufacturer should be solution annealed and quenched . The minimum annealing tempeture is 19250F . Annealing should be followed immediately by a rapid air or water quench. To obtain maximum corrosion resistance, heat treated products should be pickled and rinsed .
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