What material is A479 S31803 bars?
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What is ASTM A479 material?
ASTM A479/A479M Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels is a key standard for stainless steel materials used in boilers and pressure vessels, covering various types (austenitic, duplex, etc.) in bar (rounds, squares, hexagons) and shape (angles, tees, channels) forms, detailing chemical composition, mechanical properties, heat treatments, and testing for safe use in high-pressure applications.
What material is A479 S31803 bars?
ASTM A479 S31803 stainless steel bars are made from duplex stainless steel, commonly known as 2205 duplex stainless steel. They possess high strength, excellent corrosion resistance (especially against chloride corrosion and pitting), and good weldability. They are frequently used in chemical, oil and gas, and marine environments, and are suitable for use as bars and profiles in boilers and pressure vessels. Their properties are similar to those of ASTM A182 F51.
ASTM A479 UNS S31803 Duplex Round Bar Equivalent Grades
| STANDARD | UNS | WERKSTOFF NR. |
| Duplex 2205 | S31803 | 1.4462 |
Duplex S31803/S32205 Round Bar Specifications
| Specifications | : | ASTM A479, ASME SA479 |
| Dimensions | : | EN, DIN, JIS, ASTM, BS, ASME, AISI |
| Size | : | 6 mm to 120 mm. |
| Diameter | : | 6mm to 350mm Diameter |
| Thickness | : | 100 to 6000 mm Length |
| Tolerance | : | +/-0.2mm |
| Finish | : | Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish |
| Length | : | 1 to 6 Meters, Custom Cut Lengths |
| Form | : | Round, Square, Hex (A/F), Rectangle, Billet, Ingot, Forging Etc. |
S31803/S32205 Duplex Round Bar Chemical Composition
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| Duplex S31803 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 22.0 " 23.0 | 3.0 " 3.5 | 4.50 " 6.50 | 0.14 " 0.20 | 63.72 min |
| Duplex S32205 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 21.0 " 23.0 | 2.5 " 3.5 | 4.50 " 6.50 | 0.8 " 0.20 | 63.54 min |
Duplex S31803/S32205 Rods Mechanical Properties
| Grades | Density (g/cm 3) | Density (lb/in 3) | Melting Point (°C) | Melting Point (°F) |
| S31803 / S32205 | 7.805 | 0.285 | 1420 " 1465 | 2588 " 2669 |
What is the difference between A479 S31803 and A182 F51?
A479 S31803 and A182 F51 refer to the same core 22% Chromium duplex stainless steel material (UNS S31803/S32205), but the ASTM standards specify different product forms: A479 covers bars, rods, and shapes, while A182 covers forged components like flanges and fittings; essentially, A182 F51 is the forged version of the material often supplied as A479 bar stock for machining into other parts.
A276 S31803 VS. A479 UNS S31803 Stainless steel bar
ASTM A276 S31803 is a general-purpose stainless steel bar specification covering hot/cold-finished rounds/squares/hexes (min yield 450 MPa, tensile 620–880 MPa, elongation ≥25%, Brinell hardness ≤290 HB) for non-pressure structural uses, while ASTM A479 UNS S31803 is tailored for high-stress boiler/pressure vessel components with stricter heat treatment control, identical base chemistry (Cr 21.0–23.0%, Ni 4.5–6.5%, Mo 2.5–3.5%, N 0.08–0.20%), and optional higher carbon (up to 0.15%) for enhanced strength, typically costing 8–12% more than A276 grades for the same diameter.
Duplex Stainless Steel S31803/S32205 Bar Price List
2205 Duplex Stainless Steel Bars：US$1000-2500/ton
ASTM A479 Duplex Stainless Steel S31803 Bars：US$2000-3000/ton
Duplex Stainless Steel S32205 Hexagonal Bars：US$1.5-4.5/kg
ASTM A479 2205 Duplex Stainless Steel Round Bars：US$1800-2300/ton
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GNEE is a reliable supplier of stainless steel round bars, offering UNS S31803 / 1.4462 round bars with diameters typically ranging from Ø6 mm to Ø450 mm, and available in solution annealed or solution annealed and aged conditions.
All AISI 2205 stainless steel round bars are manufactured according to ASTM A479 and ASTM A276 standards and can be supplied with EN 10204 3.1 certificates.
GNEE offers various product forms, such as hot-rolled bars, forged bars, peeled bars, polished bars, and cut-to-length bars, to meet different processing and performance requirements.
For transportation and packaging, the round bars are treated with anti-rust oil, plastic wrapped, and packaged in seaworthy wooden crates or steel strapping.
