Name: Manufacturer of ASTM A790 S31803 Duplex Pipes EN 10204 32 Certified UNS S31803
Brand: YUHONG
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Manufacturer of ASTM A790 S31803 Duplex Pipes EN 10204 3.2 Certified UNS S31803

Categories	Stainless Steel Seamless Pipe
Brand Name:	YUHONG
Model Number:	ASTM A790 S31803
Certification:	ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008
Place of Origin:	CHINA
MOQ:	100KGS
Price:	Negotiable
Payment Terms:	L/C,T/T
Supply Ability:	1000 tons per month
Delivery Time:	Depends on quantity
Packaging Details:	Ply-wooden Case /Iron Case/ Bundle with plastic Cap/Woven Case
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)

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Yuhong Group Co.,Ltd

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Company Profile

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

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

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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 Overview

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

Equivalent Grades – Global Compliance

Mechanical Properties – Engineered for Extreme Service

Dimensional Tolerances – Precision Manufacturing

Application Domains – Where S31803 Duplex Excels

Why Choose YUHONG Duplex S31803 Pipes?

ASTM A790 duplex stainless steel pipes

EN 10204 3.2 certified S31803 pipes

UNS S31803 seamless stainless pipes

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