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| Availability: | |
|---|---|
| Quantity: | |
rade | C | Mn | P | S | Si | Ni | Cr | Mo | N |
S31803 | ≤0.03 | ≤2.00 | ≤0.03 | ≤0.02 | ≤1.00 | 4.50~6.50 | 21.00~23.00 | 2.50-3.50 | 0.08-0.20 |
Grade | Tensile Strength ksi(MPa) | Yield Strength ksi (MPa) | Elongation (%) | Hardness HBW | Hardness HRC |
S31803 | 90（620） | ≥65(450) | ≥25 | ≤290 | ≤30 |
Seawater systems
Seawater pumps and valves
Chemical process vessels, piping, and heat exchangers
FGD scrubber systems
Pulp mill digesters, bleach washers
Food process equipment
Oil field piping
Testing
EN 10204/3.1B, EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
Raw Materials Certificate
100% Radiography Test Report
100% PMI
Heat Treatment Charts
Third Party Inspection Report
Surface roughness and size measurement
Manufacturer Test Certificate( Impact Testing, Flatten, Spin,Curve, Hardness, Intergranular ,Point corrosions, Grain size, ET,UT, HT...)
Laboratory Test Certificate from Govt. Approved Lab
......
End of Pipe and Tube
BE : Beveled end
BBE : Bevel both ends
BLE : Bevel large end
BSE : Bevel small end
TOE / POE = Treaded One End / Plain One End
TOE / BOE = Treaded One End / Beveled One End
POE / BOE = Plain One End / Beveled One End
TBE = Treaded Both Ends
PBE = Plain Both Ends
Marking
Supplier / Manufacturer Name or Custom Logo - on request
Specification
Material Grade
Nominal Size
Schedule or Wall Thickness
Method of Manufacturing (Seamless or Welded)
Heat Number
Marked Pipe Sample: XTD ASTM A790 UNS 31803 SEAMLESS 42.2x 3.56*6000MM HEAT NO. 2023121205A15
Packing
Ply Wooden Boxes
PE Fabric Bundles
Standard seaworthy export packing
Plastic Bags, or as required
Delivery
Pickled&Annealed, Polished, Bright Annealed.
All tubes shall be supplied as per applicable ASTM B163 /B426
Mill test certificates will be issued
We can provide 3.2 Certification according to the needs of you
Standard
1. ASTM A789: Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless SteelTubing for General Service
2.ASTM A790: Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
UNS S31803/2205 is a duplex grade with a ferritic-austenitic microstructure. The alloy consists of around 40-50% ferrite in the annealed condition. The duplex microstructure has the high strength of the ferritic grades whilst retaining the corrosion resistance of the austenitic grades. It is not uncommon to see the metal used as a practical solution to chloride-induced stress cracking, which is the achilles’ heel of stainless steel.
It has superior resistance to chloride pitting and crevice corrosion as compared to 317L stainless steel. The alloy has outstanding corrosion resistance to seawater and most concentrations of sulphuric acid. In addition, it is also resistant to sulphide stress corrosion cracking (sour-gas environments).
The high quality and therefore performance of UNS S32205 is widely attributed to the high levels of chromium present as well as nitrogen and molybdenum.
