UNS S31803 Duplex Stainless Steel Pipe ASTM A790 Seamless Tube with Corrosion Resistance
Price:
Negotiable
MOQ:
1 PC
Delivery Time:
15-30 Workdays
Brand:
TOBO
Product Description
UNS S31803 Duplex Stainless Steel Pipe ASTM A790 F51 1.4462 Seamless Tube ISO TUV SGS Certified
UNS S31803 Duplex Stainless Steel Pipe ASTM A790 F51 DIN 1.4462
UNS S31803 (F51 / DIN 1.4462) is the original duplex stainless steel grade offering a balanced austenitic-ferritic microstructure with approximately equal phase proportions. It provides a compelling combination of high strength, excellent corrosion resistance, and cost-effectiveness compared to super duplex and high-nickel alloys.
Chemical Composition
| Grade | C max | Si max | Mn max | P max | S max | Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|---|---|
| UNS S31803 | 0.030 | 1.00 | 2.00 | 0.030 | 0.020 | 21.0-23.0 | 4.5-6.5 | 2.5-3.5 | 0.08-0.20 |
Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness (HRC) |
|---|---|---|---|---|
| UNS S31803 | ≥450 | ≥620 | ≥25 | ≤20 |
Key Features
- Yield strength approximately double that of 304/316 austenitic stainless steels
- Excellent resistance to stress corrosion cracking in chloride-bearing environments
- Good resistance to pitting and crevice corrosion
- Superior thermal conductivity and lower thermal expansion than austenitic grades
- Cost-effective solution with proven performance across multiple industries
Applications
Commonly used in chemical process piping, marine and coastal equipment, pulp and paper digesters, oil and gas flow lines, pressure vessels, heat exchangers, and structural applications where weight savings from higher strength enable material cost reduction.
Quality Assurance
Comprehensive quality testing includes dimensional inspection, chemical analysis, tensile testing, flattening testing, hydrostatic pressure testing, and non-destructive eddy current testing. Certified to ISO TUV SGS standards with full traceability documentation.
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Company
TOBO STEEL GROUP CHINA
Location
2F,Building7,Baolong Center,No.689,Xiwang Road,Jiading District,Shanghai,201800,China
Contact Person
Joy Wang