ASME SA789 S31803 Duplex Stainless Steel Heat Exchanger Tube

ASME SA789 S31803 Duplex Stainless Steel Heat Exchanger Tube

Grade S31803 is a duplex stainless steel, it has a mixed microstructure of austenite and ferrite phases, typically in a 50/50 ratio. This combination provides enhanced strength and resistance to stress corrosion cracking compared to standard austenitic stainless steels. S31803 is known for its excellent performance in highly corrosive environments, particularly those containing chlorides and other aggressive chemicals.

Chemical Composition:

Mechanical Properties:

Key Features:

• High Strength: Approximately twice the yield strength of austenitic stainless steels.
• Corrosion Resistance: Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, especially in chloride environments.
• Weldability: Good weldability with proper technique and post-weld treatment.
• Durability: High mechanical strength and toughness, even at low temperatures.

Applications:

1. Chemical Processing Industry

• Heat Exchangers: Used in heat exchangers where aggressive chemicals are processed, ensuring high performance and longevity.
• Reactors and Pressure Vessels: Suitable for reactors and pressure vessels dealing with highly corrosive substances.
• Piping Systems: Ideal for piping systems that transport aggressive chemicals at high pressures and temperatures.

2. Oil and Gas Industry

• Offshore Platforms: Suitable for offshore oil rigs and platforms where exposure to seawater and corrosive environments is common.
• Subsea Equipment: Used in subsea equipment due to its excellent resistance to stress corrosion cracking and pitting.
• Refinery Equipment: Ideal for components in refineries that process sour gas and other corrosive substances.

3. Marine Applications

• Shipbuilding: Used in marine environments where components are exposed to seawater and must resist corrosion.
• Seawater Cooling Systems: Suitable for seawater cooling systems due to its high resistance to chloride-induced corrosion.
• Desalination Plants: Ideal for desalination plant tubing where high resistance to pitting and crevice corrosion is necessary.

Yuhong Holding Group has more than 35 years experience for pipeline products, till now we have 3 big joint venture factories,  the total production area more than 130000 square meters, and more than 600 workers with 106 production lines give our clients excellent supporting always.   The factories already got certificates like : ABS, LR, DNV-GL, BV, KR, CCS, ASME, ISO 9001, ISO14001, ISO18001, ect.

Our factories main products as below : 
Factory 1th: Stainless steel seamless tube, Duplex steel seamless tube, Super duplex steel seamless tube, Nickel alloy steel seamless tube;

Factory 2th: Carbon steel seamless tube, Alloy steel seamless tube; Enhanced Heat Tranfer Tube, low fin tube ,U bending workshop;
Factory 3th: High frequency welding fin tube(HFW fin tube, Solid Fin tube, Studded Tube, Serrated Fin tube, Longitudinal welding fin tube), Wound fin tube(L type fin tube, LL type fin tube,  KL type fin tube), Embedded G type fin tube , Extruded fin tube,  low fin tube, U bend & 180deg. Return;

Yuhong Holding Group also has gained rich experience for project package( products contain:Pipes, Fittings, Flanges, heat exchanger, furnace, fired heater, air cooler, boiler) , YUHONG brand has marked its global presence in more than 85 countries, like, Korea, USA, Canada, Mexico, Colombia, Bolivia, Chile, Argentina, Brazil, Ecuador, Austria, New Zealand, Singapore, Malasyia, Indonesia, Thailand, Vietnam, Ukraine, Turkey,Sauid Arabia, Qatar, U.A.E,Israel,India, UK, France, Italy, Gernmany, Poland, Spain,... We have successfully implemented the orders of Cross Country Pipelines for our valuable customers. In addition, we have also developed a huge network of contacts and strategic alliances with most important manufacturers as stockists around the world.