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JIS G3446-1994 JIS G3448-1997 JIS G3459-1997 JIS G3463-1994,ect.
GB13296-1991 GB14975-2002 GB14976-2002,ect.
Size:
ND5 - DN400
Length:
6m length or cutting any length as request
Applications:
fluid and gas transport, structure , boiler, heat exchanger, super heater
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:
Chemical Composition (Typical, %):
Chromium (Cr): 24.0–26.0
Nickel (Ni): 5.5–7.5
Molybdenum (Mo): 2.5–3.5
Carbon (C): ≤0.03
Nitrogen (N): 0.14–0.20
Iron (Fe): Balance These elements contribute to the alloy’s duplex microstructure (a mix of austenite and ferrite), enhancing its corrosion resistance and strength.
Mechanical Properties:
Tensile Strength: ≥690 MPa (≥100 ksi)
Yield Strength (0.2% offset): ≥450 MPa (≥65 ksi)
Elongation: ≥25% (in 50 mm)
Hardness: ≤29 HRC
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:
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:
Excellent Corrosion Resistance:
Resistant to pitting and crevice corrosion in chloride-rich environments (e.g., seawater, brines) due to high chromium, molybdenum, and nitrogen content.
Good resistance to general corrosion, stress corrosion cracking (SCC), and erosion-corrosion.
High Mechanical Strength:
Duplex microstructure provides higher strength than austenitic stainless steels (e.g., 304, 316), reducing wall thickness requirements and overall weight.
Good Weldability:
Can be welded using common methods (TIG, MIG, SMAW) with proper control of heat input to maintain duplex balance.
Cost-Effectiveness:
Offers a favorable strength-to-cost ratio compared to high-nickel austenitic or super duplex grades.
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
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Distributor/Wholesaler,Exporter
Total Annual:
>1000000
Employee Number:
>100
Ecer Certification：
Verified Supplier
Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative... Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative...
