ASME SA789 , ASTM A789 S31803 Seamless Duplex Steel Tubes
ASME SA789 , ASTM A789 S31803 Seamless Duplex Steel Tubes
YUHONG Group offers ASME SA789 / ASTM A789 S31803 SMLS duplex stainless steel tubes and we sell these tubes in more than 70 countries up to now. This specification covers grades of nominal wall thickness, stainless steel tubing for services requiring general corrosion resistance, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.
S31803 steel is more than twice that of ordinary austenitic stainless steel, and it has sufficient plastic toughness for forming. It has better corrosion resistance than ordinary 316L austenitic stainless steel, and super duplex stainless steel has higher corrosion resistance. In addition, it also has good resistance to localized corrosion. Compared with austenitic stainless steel with the same alloy content, its wear resistance, corrosion resistance and fatigue corrosion resistance are all better than austenitic stainless steel.
Specifications
| Standard | ASME SA789 / ASTM A789 |
| Name of Material | Duplex Stainless Steel Tubes----Seamless or Welded |
| Keywordas | Ferritic and Austentic stainless steel; welded steel tube; duplex steel tubes etc. |
| Condition | Annealed |
| Quantity | Feet,metres,or number of lengths |
| Length | Specific or random |
Heat Treatment
S31803--------------------Temperature 1870-2010°F (1020-1100°C)-----------------Quench: 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
Chemical Composition % S31803
| C | Mn | P | S | Si | Ni | Cr | Mo | N |
| 0.03max | 2.00max | 0.03max | 0.02max | 1.00max | 4.5-6.5 | 21.0-23.0 | 2.5-3.5 | 0.08-0.20 |
Tensile Requirements
| Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) | Elongation (%) |
| S31803 | 450 | 620 | 25 min |
Hardness Requirements
| HBW | HRC |
| 290 max | 30max |
Applications Industries
Pulp and Paper Industry
Condensers & Boiler & Heat Exchangers
Sea Water Equipment
Petrochemicals- Oil Refining Chemical,etc.
Food Processing- Salt Making,etc.
Energy Field- Nuclear Power Generation,Tidal Power Generation,etc
Environmental Protection Field- Gas Processing,Waste Water Treatment,etc.
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