logo

Yuhong Holding Group Co.,LTD

Home
Products
About Us
Factory Tour
Quality Control
Contact Us
Request A Quote
Company News
Home ProductsStainless Steel Seamless Pipe

Manufacturer of ASTM A790 S31803 Duplex Pipes EN 10204 3.2 Certified UNS S31803

Manufacturer of ASTM A790 S31803 Duplex Pipes EN 10204 3.2 Certified UNS S31803

  • Manufacturer of ASTM A790 S31803 Duplex Pipes EN 10204 3.2 Certified UNS S31803
  • Manufacturer of ASTM A790 S31803 Duplex Pipes EN 10204 3.2 Certified UNS S31803
  • Manufacturer of ASTM A790 S31803 Duplex Pipes EN 10204 3.2 Certified UNS S31803
  • Manufacturer of ASTM A790 S31803 Duplex Pipes EN 10204 3.2 Certified UNS S31803
Manufacturer of ASTM A790 S31803 Duplex Pipes EN 10204 3.2 Certified UNS S31803
Product Details:
Place of Origin: CHINA
Brand Name: YUHONG
Certification: ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008
Model Number: ASTM A790 S31803
Payment & Shipping Terms:
Minimum Order Quantity: 100KGS
Price: Negotiable
Packaging Details: Ply-wooden Case /Iron Case/ Bundle with plastic Cap/Woven Case
Delivery Time: Depends on quantity
Payment Terms: L/C,T/T
Supply Ability: 1000 tons per month
Contact Now
All Products
Stainless Steel Seamless Pipe (290)
Stainless Steel Seamless Tube (277)
Duplex Stainless Steel Pipe (127)
Duplex Stainless Steel Tube (29)
Needle Tube (107)
Fin Tube (631)
Heat Exchanger (17)
Heat Exchanger Tube (424)
Heat Exchanger Tube Bundle (37)
Heat Exchanger Tubesheet (116)
Heat Exchanger Baffle (36)
Air Cooler (8)
Pressure Vessel (4)
Stainless Steel Welded Pipe (57)
Stainless Steel Welded Tube (114)
Nickel Alloy Pipe (261)
Nickel Alloy Tube (79)
Copper Alloy Tube (227)
Alloy Steel Tube (184)
Titanium Tube (10)
Bright Annealed Tube (153)
Boiler Tube (145)
Steel Fitting (804)
Steel Flange (590)
Others (391)
Cladding Parts (7)
Detailed Product Description
Material Standard: ASTM A790 / ASME SA790 UNS Number: S31803
Equivalent Grade: EN 1.4462 | UNS S32205 | Duplex 2205 Pipe Type: Seamless | Welded
Certification Level: EN 10204 3.1 | 3.2 | NORSOK End Finish: Plain Cut | Beveled (30-35°) | Threaded (NPT/BSP)
Highlight:

ASTM A790 duplex stainless steel pipes

,

EN 10204 3.2 certified S31803 pipes

,

UNS S31803 seamless stainless pipes


ASTM A790 S31803 Duplex Stainless Steel Pipe | UNS S31803 | High Strength Corrosion Resistant Pipes



Meta Description:


Manufacturer of ASTM A790 S31803/2205 duplex steel pipes. Certified EN 10204 3.1, 100% hydro tested, PREN >38. Ideal for offshore, chemical & oil/gas. Request specs.



Product Overview


Our ASTM A790 seamless duplex pipes (UNS S31803) combine austenitic and ferritic microstructures, delivering 2x the yield strength of 316L stainless steel with exceptional chloride stress corrosion cracking (SCC) resistance. Ideal for high-pressure, corrosive environments.

Key Advantages:


  • PREN >38 (Pitting Resistance Equivalent)


  • 100% Hydrostatic Testing per ASTM A790


  • Low-Temperature Toughness (-50°C / -58°F)


  • Certified Traceability: EN 10204 3.1 MTC



Chemical Composition (Wt. %) – Optimized for Corrosion Resistance


Table: Balanced Chemistry of S31803 Duplex Steel Pipe


Element Min Max Target Role in Performance
Cr 21.0 23.0 22.0 Pitting/Corrosion Resistance
Ni 4.5 6.5 5.5 Austenite Stability
Mo 2.5 3.5 3.0 Chloride Resistance
N 0.08 0.20 0.15 Strength & PRE Boost
Mn - 2.0 1.2 Deoxidation
C - 0.030 0.02 Weldability
S - 0.020 0.001 Machinability
P - 0.030 0.025 -
Fe Balance




Equivalent Grades – Global Compliance


Table: Cross-Standard Material Equivalents


Standard Grade Common Name Similarity
UNS S31803 Duplex 2205 Identical
EN 1.4462 X2CrNiMoN22-5-3 Direct Equivalent
ASME SA790 - Parent Spec
GOST 03Kh22N6M2 - Comparable
JIS SUS 329J3L - Near Match



Mechanical Properties – Engineered for Extreme Service


Table: Room-Temperature Mechanical Properties per ASTM A790


Property Requirement Typical Value Advantage vs. 316L
Tensile Strength ≥ 620 MPa 750-895 MPa +40% Higher
Yield Strength (0.2%) ≥ 450 MPa 550-625 MPa 2x Higher
Elongation (%) ≥ 25% 28-35% Superior Ductility
Hardness (Rockwell C) ≤ 32 HRC 28-32 HRC Optimal for Sour Service
Impact Toughness ≥ 100 J (-50°C) ≥140 J Arctic Readiness



Dimensional Tolerances – Precision Manufacturing


Table: Permissible Variations per ASTM A790/ASME B36.19


Parameter Tolerance (Seamless Pipe) Critical Application Focus
OD (Outer Diameter) ±0.8% or ±0.2mm* Fitting Compatibility
Wall Thickness +20% / -12.5% Pressure Integrity
Straightness ≤ 0.2% of length Offshore Installation
Cut Length +3mm / -0mm Welding Efficiency




Application Domains – Where S31803 Duplex Excels


Corrosion-Demanding Environments:


  • Offshore Oil & Gas: Seawater injection lines, risers, umbilicals


  • Chemical Processing: Acid coolers, chloride-bearing reactors


  • Power Generation: FGD (Flue Gas Desulfurization) systems


  • Pulp & Paper: Bleach plants, digesters


  • Desalination Plants: High-salinity brine heaters



Why Choose YUHONG Duplex S31803 Pipes?


  • Full Traceability


  • NACE MR0175/ISO 15156 Compliant (Sour Service)


  • Global Stock: Sizes 1/2" to 24" (DN15-DN600), SCH 10S to XXS


  • Custom Processing: Beveling, polishing, PMI testing


Tag:

seamless stainless steel tube,

seamless boiler tubes,

stainless steel seamless pipes

Contact Details
Yuhong Group Co.,Ltd

Contact Person: Freya

Tel: +8617276485535

Fax: 0086-574-88017980

Send your inquiry directly to us (0 / 3000)

Connect online
Sitemap
Products
Home
Privacy Policy | China Good Quality Stainless Steel Seamless Pipe Supplier.
© 2013 - 2025 Yuhong Group Co.,Ltd. All Rights Reserved.

20TH FLOOR,NO.1 NEW WORLD BUILDING ,NO.1018 MINAN ROAD,YINZHOU DISTRICT, NINGBO CITY, ZHEJIANG PROVINCE, CHINA

jikin@steelseamlesspipe.com；jikin888@foxmail.com

Mobile Site

Want to know more about us ？ Just contact us