UNS S31200 is a duplex stainless steel (DSS) grade, renowned for
its excellent combination of corrosion resistance, mechanical
strength, and weldability. It is widely specified in various
industrial applications where both durability and resistance to
harsh environments are critical. Below is a detailed overview of
UNS S31200 stainless steel pipes, including their parameters,
standards, specifications, equivalent grades, characteristics, and
applications.
1. Key Parameters
UNS S31200 stainless steel pipes exhibit the following core
material properties, which make them suitable for demanding
environments:
2. Applicable Standards
UNS S31200 seamless pipes are primarily manufactured and tested in
accordance with ASTM A790, a standard specification for seamless
and welded ferritic/austenitic duplex stainless steel pipe. This
standard defines requirements for:
- Chemical composition
- Mechanical properties (tensile strength, yield strength,
elongation)
- Dimensional tolerances
- Non-destructive testing (e.g., ultrasonic testing, hydrostatic
testing)
- Surface finish
3. Specifications
UNS S31200 seamless hollow tubes are available in a range of
specifications to meet diverse industrial needs:
Dimensions:
- Outer Diameter (OD): Typically from 6 mm (0.25 inches) to 610 mm
(24 inches), with custom sizes available.
- Wall Thickness (WT): From 0.5 mm (0.02 inches) to 50 mm (2 inches),
depending on OD and application requirements.
- Length: Standard lengths include 6 meters (20 feet) or 12 meters
(40 feet); cut-to-length options are also offered.
Surface Finish:
- Annealed and pickled (AP): For general applications, providing a
clean, corrosion-resistant surface.
- Polished: Optional (e.g., 2B, BA finishes) for applications
requiring enhanced hygiene or aesthetics.
End Connections:
- Plain ends (PE)
- Beveled ends (for welding)
- Threaded ends (per ASTM A530 or customer specifications)
4.Equivalent Grades of UNS S31200 Stainless Steel
UNS S31200 is known by different designations across international
standards. Its key equivalents include:
- European Standard (EN): 1.4462
- ISO: X2CrNiMoN25-7-4
- Japanese Industrial Standard (JIS): SUS 329J4L
- Chinese Standard (GB): 022Cr25Ni7Mo4N
5. Characteristics
UNS S31200 stainless steel pipes offer a unique set of advantages,
making them preferred in challenging environments:
6. Applications
Due to their robust properties, UNS S31200 seamless pipes are
widely used in industries requiring resistance to corrosion and
high strength:
- Marine Engineering: Seawater intake systems, desalination plants,
offshore oil and gas platforms.
- Chemical Processing: Piping for handling acids, alkalis, and
corrosive chemicals.
- Oil and Gas Industry: Downhole tubing, flowlines, and offshore
pipeline components.
- Water Treatment: Piping in wastewater treatment plants and
industrial water systems.
- Power Generation: Cooling water systems in thermal and nuclear
power plants.
In summary, ASTM A790 UNS S31200 seamless stainless steel pipes are
a reliable choice for applications demanding a balance of corrosion
resistance, strength, and cost-effectiveness, making them a staple
in harsh industrial environments
ASTM A312 309S SS Pipe DIN 1.4833 Seamless Stainless Steel Round Pipe
