Rod stainless steel Sanmac® 2205+

Sanmac® 2205+ is a duplex (austenitic‑ferritic) stainless steel solid bar with excellent material cleanliness designed for highly demanding applications. Manufactured and supplied to meet bar‑stock industry standards, aligned to ISO 17781 and IOGP S‑563.

Grade characteristics

• High
  • Mechanical strength – approximately twice the proof strength of standard austenitic stainless steels
  • Resistance to stress corrosion cracking (SCC) in chloride-bearing environments
  • Resistance to SCC in environments containing hydrogen sulfide (H2S)
  • Resistance to general corrosion, pitting and crevice corrosion
  • Resistance to erosion corrosion and corrosion fatigue
• Good
  • Hot‑working properties
  • Weldability

Material designations

• UNS: S31803, S32205
• EN number / W.Nr.: 1.4462

Product standards

• ISO 17781:2017 QL1 (D ≤ 215 mm) and QL2 (D > 215–260 mm)
• IOGP S‑563:2018 (D ≤ 260 mm)
• ASTM A‑479 / ASME SA‑479
• ASTM A‑276 / ASME SA‑276
• EN 10088‑3 and EN 10088‑5 (D ≤ 160 mm)
• NORSOK M‑630 2020 Rev.7, MDS D47 Rev.6 (D ≤ 260 mm)
• NACE MR0175 / ISO 15156‑3 and NACE MR0103 / ISO 17945‑1
• ISO 14067:2018 (CO2e) — carbon footprint / LCA available for D 75–260 mm

Approvals

• Pressure Equipment Directive / PED (2014/68/EU)
• Pre‑approval for PMA
• ISO17782:2018, NORSOK M650 Ed. 4
• DNV approved manufacturer

Applications

• Service in chloride‑bearing and hydrogen sulfide (sour) environments
• Flowlines for oil and gas extraction from sour wells; refinery and process solutions contaminated with chlorides
• Cooling systems using chloride‑bearing or brackish water
• Handling of dilute sulphuric acid and organic acids (e.g. acetic acid and mixtures)
• Alternative to austenitic steels for heavy‑load structures due to higher strength and improved life‑cycle economics

Corrosion resistance

• Generally better resistance to general corrosion than ASTM 316L/317L
• Much less prone to SCC in chloride‑bearing solutions than standard austenitic grades; usable up to 232°C (450°F) in sour environments under specified H2S partial pressures and hardness limits
• PRE (Pitting Resistance Equivalent) > 35
• Good resistance to erosion corrosion and corrosion fatigue

Chemical composition (nominal) %

• C: ≤ 0.030
• Si: ≤ 1.0
• Mn: ≤ 2.0
• P: ≤ 0.020
• S: ≤ 0.010
• Cr: 22.5
• Ni: 5.5
• Mo: 3.2
• N: 0.18

Physical and mechanical highlights

• Proof / Yield strength (min.): Rp0.2 = 450 MPa (Rp1.0 = 500 MPa where specified)
• Ultimate tensile strength (R_m): 680–880 MPa (typical)
• Elongation: D ≤ 260 mm ≥ 30%; D > 260 mm ≥ 25%
• Impact strength (Charpy‑V longitudinal): ISO17781 QL1 D ≤ 215 mm — 85 J average / 65 J single; QL2 D > 215–260 mm — 65 J average / 50 J single; RT minimum 100 J average / 70 J single
• Hardness: max 28 HRC
• Density: 7.8 g/cm³

Forms of supply, tolerances and finishing

• Stocked as solid round bar, standard diameter range 20–260 mm (0.78–10.23”)
• Supplied solution annealed, quenched and peel‑turned
• Lengths: random 3–7 m depending on diameter
• Typical surface finish (peel turned): Ra ≈ 2 μm for ≤ 200 mm; ≈ 5 μm for >200–260 mm
• Straightness typical arch height: 1 mm for diameters 25–75 mm; 2 mm for diameters >75 mm

Manufacturing, heat treatment & microstructure

• Manufactured at Alleima Tube AB facility in Sandviken, Sweden (complete production from raw material to finishing and testing)
• Solution annealing at 1020–1100°C followed by water quenching
• Austenitic–ferritic microstructure with ferrite content 35–55%, free from grain‑boundary carbides and intermetallic phases in solution‑annealed and quenched condition

Welding, hot working and machining

• Good weldability — TIG/GTAW preferred; recommended heat input < 2.5 kJ/mm and interpass temperature < 150°C (300°F)
• Recommended filler metals for standard and severe environments (e.g. ISO 14343 / AWS ER2209 and ER2594 variants)
• Hot working temperature range: 975–1200°C; avoid dropping below 950°C to prevent sigma phase
• Machining requires appropriate tooling and strategies due to ISO‑M material group behavior (high cutting forces, tool wear)