ASTM A789 covers both seamless and welded stainless steel pipes, primarily used for general corrosion-resisting and high-temperature service. These pipes are typically made from duplex and super duplex stainless steels, offering a combination of strength and corrosion resistance.
Key Features:
Material Composition:
Made from duplex and super duplex stainless steels, which have higher chromium, molybdenum, and nitrogen content than standard austenitic stainless steels.
Common grades include UNS S31803, UNS S32205, and UNS S32750.
Manufacturing Process:
Seamless Pipe: Made by extruding the steel to the desired length, ensuring no welds throughout the pipe.
Welded Pipe: Formed by rolling the steel and welding it longitudinally. The weld seam is then heat-treated to restore corrosion resistance.
Specifications:
Standard: ASTM A789 / A789M
Grades: Duplex and super duplex grades, which provide higher strength and better resistance to stress corrosion cracking compared to standard austenitic grades.
Mechanical Properties:
Higher tensile and yield strength than standard austenitic stainless steels.
Excellent toughness and ductility.
Good resistance to chloride stress corrosion cracking.
Corrosion Resistance:
Superior resistance to pitting and crevice corrosion due to high chromium and molybdenum content.
Good resistance to general corrosion in various environments.
Applications:
- Oil and Gas Industry:
Used in offshore platforms, pipelines, and processing facilities where high strength and corrosion resistance are essential.
- Chemical Processing:
Suitable for transporting aggressive chemicals and handling high-temperature processes.
- Marine Applications:
Ideal for shipbuilding and marine structures due to excellent resistance to seawater corrosion.
- Pulp and Paper Industry:
Used in the production and processing of paper, where resistance to chemicals and high temperatures is required.
- Desalination Plants:
Employed in systems converting seawater to freshwater, benefiting from the pipe's resistance to chloride corrosion.
- Heat Exchangers:
Suitable for use in heat exchangers due to their excellent thermal conductivity and resistance to high temperatures and corrosive environments.
ASTM A789 seamless and welded stainless steel pipes are designed for demanding environments requiring high strength and superior corrosion resistance. Their use of duplex and super duplex stainless steels makes them suitable for critical applications in the oil and gas, chemical processing, marine, and other industries where long-term performance and reliability are essential.
United Steel Industry As the most important steel pipe manufacturer and exporter in China, in the past 20 years, we have completed more than 100 projects, with partners in more than 100 countries, and established relationships with oil and gas and EPC companies in many countries business relationship.
For more information about the product price, catalog and rolling mill inspection certificate,
please consult:Email:Sales@usisteels.com
