| Materialrd: | Duplex Stainless Steel | Product: | |
|---|---|---|---|
| Standard: | ASTM A790 / ASME SA790 | Grade: | S31803 |
| Application: | For General Service | Length: | Or As Required |
| Certificate: | ISO9001-2008， API 5L， API 5CT， Etc. | Packing Details: | Ply-wooden Case /Iron Case/ Bundle With Plastic Cap |
ASTM A790 ， ASME SA790 S31803 Seamless Duplex Steel Pipes
TONG CHUANG Group， a factory offers ASME SA790 / ASTM A790 S31803 SMLS duplex stainless steel pipes and we sell these pipes with high quality in more than 70 countries up to now.
ASTM A790/ ASME SA790 This specification covers seamless and straight-seam welded ferritic/austenitic steel pipe intended for general corrosive service， with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.
Specifications
| Standard | ASME SA790 / ASTM A790 |
| Name of Material | Duplex Stainless Steel Pipes—-Seamless |
| Keywordas | Ferritic and Austentic stainless steel;; duplex steel pipes etc. |
| Condition | Annealed |
| Quantity | Feet，metres，or number of lengths |
| Length | Specific or random |
Advantages
1. These pipes are made from a duplex stainless steel alloy that offers excellent resistance to corrosion， especially in harsh environments such as high chloride and acidic conditions.
2. ASTM A790 S31803 pipes have a higher strength compared to austenitic stainless steel pipes， making them suitable for applications that require high mechanical strength.
3. They are more affordable compared to other high-performance alloys while still providing excellent corrosion resistance and strength.
4. These pipes can be easily welded using commonly used techniques and do not require preheating or post-weld treatment， saving time and resources during installation.
5. ASTM A790 S31803 pipes have a low coefficient of thermal expansion， which means they can withstand thermal cycles without deformations. This property is especially beneficial in applications where temperature fluctuations are common.
Overall， the ASTM A790 S31803 pipes offer a combination of corrosion resistance， strength， cost-effectiveness， and versatility， making them a preferred choice for many demanding applications.
Heat Treatment
| UNS | Heat Treating Temperature | Quench |
| S31803 | 1870-2010°F [1020-1100°C] | Rapid cooling in air or water |
Test Required
Chemical Analysis/ Mechanical Properties/ Hardness Test/ Flattening Test/ Tension Test/ FlaringTest
Intergranular Corrosion Test/ Hydrostatic or Nondestructive Electric Test/ Ultrasonic Test，etc
Chemical Composition % S31803 MAX
| C | Mn | P | S | Si | Ni | Cr | Mo | N |
| 0.03 | 2 | 0.03 | 0.02 | 1 | 4.5-6.5 | 21-23 | 2.5-3.5 | 0.08-0.2 |
Tensile Requirements
| Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) | Elongation (%) |
| S31803 | 450 | 620 | 25 min |
Hardness Requirements
| HBW | HRC |
| 290 max | 30max |
Applications Industries
Oil and Gas
Chemical Processing
Pulp and Paper Industry
Desalination Plants
Condensers & Boiler & Heat Exchangers
Sea Water Equipment
Food Processing- Salt Making，etc.
Energy Field- Nuclear Power Generation，Tidal Power Generation，etc
Environmental Protection Field- Gas Processing，Waste Water Treatment，etc.
