Delivering High Quality Stainless Steel and Alloy Piping Products — Pipes, Tubes, Fittings, Flanges and more for Global Industries.
sales@savoypipinginc.com
Delivering High Quality Stainless Steel and Alloy Piping Products — Pipes, Tubes, Fittings, Flanges and more for Global Industries.
sales@savoypipinginc.com
| Choose | When | Watch-outs |
|---|---|---|
| S31803 | As named on the datasheet / PO | Confirm A790 vs A789 vs A928 |
| Related UNS | Near-neighbour duplex / super duplex | Do not substitute without design review |
| Duplex hub | Family overview | State PREN / NACE needs |
ASTM A790 UNS S31803 seamless NPS/OD: ____ Wall/Sch: ____ Qty: ____ PREN/NACE: ____ MTC: 3.1/3.2 Destination: ____
Email sales@savoypipinginc.com with destination and any IBR / NACE / TPI notes.
Savoy Piping Inc. supplies ASTM A790 S31803 seamless pipe — 22% Cr duplex stainless (ferrite–austenite) — higher strength and chloride resistance than 316L.
A790 Seamless · A790 Welded · A789 Tube · A928 EFW · Duplex hub
Also see: Duplex & super duplex hub · Duplex buttweld · Duplex flanges.
UNS S31803 seamless pipe for chloride and high-strength duty. typical duplex min yield ~450 MPa (65 ksi), tensile ~620 MPa (90 ksi) — confirm A790/A789 PO.
Many POs now prefer tighter S32205. Do not mix S31803/S32205 without engineer approval. Temp window typically avoids prolonged >250–300°C and deep cryogenic.
S31803 vs S32205: S32205 is the modern tighter 2205 chem. vs 316L: duplex wins on strength/PREN; watch fabrication/heat input.
| ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipes Specification | ASTM A789, ASTM A790, ASTM A928, ASME SA789, ASME SA790, ASME SA928 |
| ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipes Grades | ASTM A790 / ASME SA790 UNS S31803 |
| ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipes Type | Seamless / Welded / ERW / EFW / Cold Draw / Hot Finish / Cold Finish |
| ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipes Outer Diameter Size | Seamless - 1/2" NB TO 18" NB Welded / ERW- 1" NB TO 16" NB EFW - 8" NB TO 110" NB |
| ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipes Wall Thickness | Schedule 10 to Schedule 160 (3 mm to 100 mm Thickness) |
| ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipes Length | 01 Meter to 12.5 Meters, Single Random Length, Double Random Length And Customize Size. |
| ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipes Ends | Plain Ends / Beveled Ends |
| ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipes Delivery Conditions | As Rolled, Formed, Stress Relieved, Annealed, Hardened, Tempered, Cold Draw, Bright Annealed |
| ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipes Coating | Electropolish, Mechanical Polish, Satin Finish, Passivated |
| ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipes Other Testing | Product Analysis, Transverse Tension Test, Flattening Test, Etching Test, Radiograph HIC Examination, Stabilizing Heat Treatment, Intergranular Corrosion Test, Weld Decay Test, Magnetic Particle Detection, Grain Size Test, NACE 0175, Dual Grade, PWHT (POST WELD HEAT TREATMENT), Flare Test, Bend Test, Hardness Test, Tensile Test etc |
| ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipes Dimension | All Pipes Is Manufactured and Inspected / Tested to the Relevant standards including ASTM And ASME |
| ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipes Value Added Services | Draw / Expansion / Machining / Sand Blasting / Shot Blasting / Heat Treatment |
| ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipes Packaging | Loose / Bundle / Wooden Pallet / Wooden box-a / Plastic Cloth Wraps / Plastic End Caps / Beveled Protector |
| ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipes Shipment & Transportation | By Road - Truck / Train, By Sea - Break-bulk Conventional Vessel / FCL (Full Container Load) / LCL (Less Container Load) / 20 Feet Container / 40 Feet Container / 4 Feet Container / High Cube Container / Open Top Container, By Air - Freighter Civil Passenger and Cargo Planes |
| ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipes Material Test Certificate | Manufacturer Test Certificate As Per EN10204 3.1, 3.2 / Laboratory Test Certificate From NABL Approved Lab. / Under Third Party Inspection Agency Like SGS, TUV, DNV, LLOYDS, ABS ETC |
Composition ranges for 2205 grade stainless steels
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 2205 (UNS S31803) | Min Max | - 0.030 | - 2.00 | - 1.00 | - 0.030 | - 0.020 | 21.0 - 23.0 | 2.5 - 3.5 | 4.5 - 6.5 | 0.08 - 0.20 |
| 2205 (UNS S32205) | Min Max | - 0.030 | - 2.00 | - 1.00 | - 0.030 | - 0.020 | 22.0 - 23.0 | 3.0 - 3.5 | 4.5 - 6.5 | 0.14 - 0.20 |
The Typical Mechanical Properties of grade 2205 stainless steels are listed in the table below. Grade S31803 has similar Mechanical Properties to that of S32205.
| 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 | 620 | 448 | 25 | 31 max | 293 max |
The physical properties of grade 2205 stainless steels are tabulated below. Grade S31803 has similar physical properties to that of S32205.
| Grade | Density (kg/m3) |
Elastic Modulus(GPa) |
Mean Co-eff of Thermal Expansion (μm/m/°C) |
Thermal Conductivity (W/m.K) |
Specific Heat 0-100°C( J/kg.K) |
Electrical Resistivity (nΩ.m) |
|||
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | |||||
| UNS S31803 / 2205 | 7800 | 190 | 13.7 | 14.2 | - | 19 | - | 418 | 850 |
the grade comparison for 2205 stainless steels. The values are a comparison of functionally similar materials. Exact equivalents may be obtained from the original specifications.
| Grade | UNS No |
Old British | Euronorm | Swedish SS | Japanese JIS | ||
| BS | En | No | Name | ||||
| 2205 | S31803 / S32205 | 318S13 | - | 1.4462 | X2CrNiMoN22-5-3 | 2377 | SUS 329J3L |
Given below is a list of possible alternative grades, which may be chosen in place of 2205.
| Grade | Reasons for choosing the grade |
| 904L | Better formability is needed, with similar corrosion resistance and lower strength. |
| UR52N+ | High resistance to corrosion is required, e.g. resistance to higher temperature seawater. |
| 6%Mo | Higher corrosion resistance is required, but with lower strength and better formability. |
| 316L | The high corrosion resistance and strength of 2205 are not needed. 316L is lower cost. |
Grade 2205 stainless steel exhibits excellent corrosion resistance, much higher than that of grade 316. It resists localized corrosion types like intergranular, crevice and pitting. The CPT of this type of stainless steel is around 35°C. This grade is resistant to chloride stress corrosion cracking (SCC) at temperatures of 150°C. Grade 2205 stainless steels are apt replacements to austenitic grades, especially in premature failure environments and marine environments.
The high oxidation resistance property of Grade 2205 is marred by its embrittlement above 300°C. This embrittlement can be modified by a full solution annealing treatment. This grade performs well at temperatures below 300°C.
The best suited heat treatment for this grade is solution treatment (annealing), between 1020 - 1100°C, followed by rapid cooling. Grade 2205 can be work hardened but cannot be hardened by thermal methods.
Most standard welding methods suit this grade, except welding without filler metals, which results in excess ferrite. AS 1554.6 pre-qualifies welding for 2205 with 2209 rods or electrodes so that the deposited metal has the right balanced duplex structure.
Adding nitrogen to the shielding gas ensures that adequate austenite is added to the structure. The heat input must be maintained at a low level, and the use of pre or post heat must be avoided. The co-efficient of thermal expansion for this grade is low; hence the distortion and stresses are lesser than that in austenite grades.
The machinability of this grade is low due to its high strength. The cutting speeds are almost 20% lower than that of grade 304.
The fabrication of this grade is also affected by its strength. Bending and forming of this grade requires equipment with larger capacity. Ductility of grade 2205 is lesser than austenitic grades; therefore, cold heading is not possible on this grade. In order to carry out cold heading operations on this grade, intermediate annealing should be carried out.
ASTM A790 UNS S31803 Duplex Stainless Steel Pipes and Tubes Applications
A790 covers seamless and welded ferritic/austenitic stainless pipe. S31803 is 22% Cr duplex stainless (ferrite–austenite) — higher strength and chloride resistance than 316L.
A790 is pipe; A789 is tube. Keep the product noun matching the datasheet.
typical duplex min yield ~450 MPa (65 ksi), tensile ~620 MPa (90 ksi) — confirm A790/A789 PO
Control heat input and interpass temperature to maintain phase balance and avoid sigma/chi phases.
We supply this product for domestic and export projects with MTC (EN 10204 3.1 standard; 3.2 / TPI on request). Include destination, Incoterms and inspection needs on the RFQ.