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

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

Tensile Requirements

Hardness Requirements

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.