Duplex Stainless Steel A790 SA790 S31803 2205 Pipe
S31803 Stainless Steel is a 22% chromium, 3% molybdenum, 5-6% nickel, nitrogen alloyed duplex stainless steel with high general, localized, and stress corrosion resistance properties in addition to high strength and excellent impact toughness.
Alloy ASME SA789 S31803 Stainless Steel Pipe provides pitting and crevice corrosion resistance superior to 316L or 317L austenitic stainless steel in almost all corrosive media. It also has high corrosion and erosion fatigue properties as well as lower thermal expansion and higher thermal conductivity than austenitic.The advantage of a duplex structure is that it combines the favorable qualities of a ferritic alloy stress corrosion cracking resistance and high strength with austenitic alloy ease of fabrication and corrosion resistance.
Duplex Steel ASTM A789 S31803 is a nitrogen enhanced duplex stainless steel that was developed to combat common corrosion problems encountered with the 300 series stainless steel. “Duplex” describes a family of stainless steel that are neither fully austenitic, like 304 stainless, nor purely ferritic, like 430 stainless steel. The structure of S31803 duplex stainless steel consists of austenitic pools surrounded by a continuous ferritic phase. In the annealing condition, S31803 contains approximately 40-50% ferrite. Often referred to as the work horse grade, S31803 is the most widely used grade in the duplex stainless steel tube.
| Dimension | Welded: 1/2″~72″ Seamless: 3/8″~16″ / SCH 5S SCH10S, 40S, STD, XS, SCH80S |
|---|---|
| Grade | UNS S31803, S32205, S32750, S32760, S32304, 1.4462, 1.4410, 1.4501, 1.4362 etc. |
| Standard | ASTM A789, ASTM A790, ASME SA 789 ASME SA 790, EN 10216-5, EN/DIN17455-2, EN17456-2 etc. |
ASTM A789 A790 ASME SA789 SA790 S31803 Stainless Steel Pipe Composition %:
| C | Si | Mn | P | S | Cr | Mo | Ni | N | Cu |
| max. 0,03 | max. 1,00 | max. 2,00 | max. 0,030 | max. 0,020 | 21,00 – 23,00 | 2,5 – 3,5 | 4,50 – 6,50 | 0,08-0,20 | – |
Mechanical Properties of S31803 Stainless Steel Pipe in the Annealed Condition at -20°F to +100°F Size in OD25.4mm, WT 1.65mm
| Tensile Strength | Yield Strength | ||||||||
| Alloy | UNS | Spec. | MPa | ksi | MPa | ksi | Elongation in 2 in. (min.) % | Grain Size Req. | Max. Hardness |
| Duplex 2205 | S32205 | A789, A790 | 655 | 95 | 485 | 70 | 25 | — | 290HBW, |
| 30* HRC | |||||||||
| Duplex S31803 | S31803 | A789, A790 | 620 | 90 | 450 | 65 | 25 | — | 290HBW, |
| 30* HRC | |||||||||
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