ASTM A790 UNS S31803 Pipe
WT: 0.5-45mm
Length: 0.5mtr-20mtr
Standard & Grade : ASTM A790/ A778/ A789 /A928 /A240, ASME SA790/SA790M Grade S31803, S32205, S32750, S32760, ASTM A182, F51 Pipe and Fittings
Product Overview
ASTM A790 UNS S31803 pipe, commonly known as 2205 duplex stainless steel pipe, is a seamless/welded tubular product manufactured per ASTM A790 standard for corrosive fluid transportation. Its EN grade is 1.4462 (X2CrNiMoN22-5-3), and Chinese brand S22253.
Key Features
Duplex microstructure ensures high strength and structural stability
The solution annealing process precisely balances austenite and ferrite at a 50:50 ratio, preventing material embrittlement during subsequent fabrication or welding.
High yield strength allowing thinner aall designs
Delivering nearly double the yield strength of conventional austenitic stainless steels, this allows engineers to optimize wall thickness, directly reducing total material weight and shipping costs.
Optimized pickling process improves surface quality
Advanced acid-cleaning and passivation remove all microscopic oxide scales and free iron contamination, leaving an ultra- smooth passivation layer that enhances passive corrosion resistance.
Chemical Composition
| Element | S31803 (%) | Function / Why It Matters |
|---|---|---|
| Chromium | 21–23 | Forms a self-healing anti-corrosion shield |
| Molybdenum | 2.5–3.5 | Enhances resistance to pitting corrosion |
| Nitrogen | 0.08–0.20 | Increases strength without brittleness |
| Nickel | 4.5–6.5 | Maintains toughness under stress |
Material Properties
| Grade | Tensile Strength (MPa) Min | Yield Strength 0.2% Proof (MPa) Min | Elongation (% in 50mm) Min | Hardness Rockwell C (HR C) | Brinell (HB) |
|---|---|---|---|---|---|
| UNS S31803 / 2205 | 621 | 448 | 25 | 31 max | 293 max |
Grade Comparison: S31803 vs S32205 vs 904L
| Grade | Cost | Best For | Weldability |
|---|---|---|---|
| S31803 (Workhorse) | $$ | 90% of chemical plants | Easy |
| S32205 (Premium) | $$$ | Offshore rigs | Requires expertise |
| 904L (Luxury) | $$$$ | Nuclear waste | Laser only |
main applications
Water treatment & seawater related projectsAuxiliary pipelines of seawater desalination plants, coastal power plant cooling circulation pipes, moderate chloride wastewater delivery lines.
Power industry FGD systemFlue gas desulfurization circulating pipes for coal-fired power stations to resist acidic chloride slurry.
Chemical & pulp paper industryMedium-corrosion chemical process piping, pulp bleaching equipment tubes, brine and salt water transport pipelines.
General offshore & oil & gas non-sour serviceOffshore platform cooling pipelines, non-sour water injection pipes, low-corrosion oilfield gathering lines without high H₂S content.
Environmental & industrial equipment Municipal high-salinity sewage pipelines, heat exchangers, condenser tubes for moderate corrosive working conditions.
Quality & Certifications
- Standards Compliance: Compliant with ASTM A790 and recognized international standards.
- Certifications: ISO 9001:2015 quality management system, CE / PED 2014/68/EU optional.
- Third-Party Approvals: Certified or approved by major international inspection agencies (TÜV, SGS, BV, DNV, ABS, LR, etc.).
- Material Test Certificates (MTC): EN 10204 3.1 certificates available upon request.
- Inspection & Testing: Includes chemical composition analysis, mechanical property testing, dimensional inspection, and non-destructive testing (ultrasonic, eddy current).
Packaging & Delivery
- Standard packaging: wooden crates, plastic sleeves to prevent damage.
- MOQ: Flexible based on grade and size.
- Lead times adjusted to customer requirements.
- Supports custom packaging, labeling, and private branding.
- Common logistics partners for samples or small orders: DHL, FedEx, UPS.
Provide customized processing services
- Cutting to custom lengths.
- Surface finishes: polished, pickled, matte, or brushed.
- OEM packaging & private labeling for brand-specific requirements.
- Tailored mechanical properties or heat treatments to meet specific project requirements.
FAQ
Q1: What grades are available for duplex stainless steel pipes?
A: UNS S31803 (2205), UNS S32205, UNS S32750, UNS S32760, SAF 2205, SAF 2507, and more.
Q2: Can you provide material test certificates (MTC)?
A: Yes, EN 10204 3.1 / 3.2 certificates, including chemical composition and mechanical property reports, are available upon request.
Q3: Do you support third-party inspection?
A: Yes, inspections by SGS, BV, or other accredited agencies can be arranged.
Q4: Can you manufacture according to drawings or custom specifications?
A: Yes, OEM and custom production based on technical drawings or project requirements is supported.
Q5: What is your delivery time?
A: Standard products are available from stock; customized orders depend on specifications and quantity.
Q6: Are nitrogen-purged pipes available for welding applications?
A: Yes, for orders over 5 tons, nitrogen purging is offered to prevent weld oxidation.
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