Stainless Steel S32803-ANN (Annealed)
Heat-treated state · default condition
UNS S32803
Standard stocked condition for tubing, pipe and plate; best corrosion resistance and toughness.
Values for the ANN condition
Other S32803 tempers and conditions
S32803 is listed in 6 conditions; see the grade overview at S32803.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Cold Rolled + Annealed | Choose for sheet fabrication (tube shells, liners) where a smooth pickled or bright surface is required. | 510 | 630 | 26 | 185 HB | 2.6 % IACS |
ANNDefaultThis page Annealed | Standard stocked condition for tubing, pipe and plate; best corrosion resistance and toughness. | 520 | 640 | 25 | 195 HB | — |
Cold Worked 80 ksi | Entry strength level for corrosion-resistant-alloy downhole tubing where collapse/burst demands are moderate. | 600 | 720 | 20 | 22 HRC | 2.6 % IACS |
Cold drawn | Pick for tighter tolerance and better straightness/surface with a modest strength increase over annealed. | 620 | 740 | 18 | 21 HRC | 2.6 % IACS |
Cold Worked 110 ksi | Common oilfield strength level for deep wells; balance of load capacity and residual ductility. | 800 | 880 | 15 | 28 HRC | 2.6 % IACS |
Cold Worked 125 ksi | Highest routinely supplied strength level; check hardness caps and CVN for sour-service qualification. | 900 | 970 | 13 | 31 HRC | 2.6 % IACS |
What is S32803-ANN?
S32803-ANN is S32803 heat treated to ANN — standard stocked condition for tubing, pipe and plate; best corrosion resistance and toughness. S32803-ANN has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 640 MPa (92.8 ksi) — stronger than 79% of stainless steel grades. Elongation at break is 25% and the elastic modulus is 205 GPa (29.7 Msi). S32803-ANN has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,420°C (2,588 °F).
Advantages
- Good corrosion resistance — 82/100, better than 90% of stainless steel grades
- High strength — 520 MPa (75.4 ksi), better than 79% of stainless steel grades
- High electrical conductivity — 2.6 % IACS, better than 77% of stainless steel grades
Limitations
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
- Low fracture toughness — 70 MPa·√m (63.7 ksi·√in), worse than 83% of stainless steel grades
- Difficult to weld — 45/100, worse than 79% of stainless steel grades
S32803-ANN properties
Typical room-temperature values for S32803-ANN; 10 are specific to this condition. Other listed values are S32803 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S32803-ANN has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,420°C (2,588 °F).
Mechanical15
S32803-ANN has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 640 MPa (92.8 ksi) — stronger than 79% of stainless steel grades. Elongation at break is 25% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
S32803-ANN is rated for continuous service to 300°C (572 °F). It conducts heat at 16 W/m·K (9.24 BTU/hr·ft·°F), better than 58% of stainless steel grades. Thermal expansion is 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
S32803-ANN conducts electricity at 2.6 % IACS, better than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (82/100), better than 90% of stainless steel grades.
Sustainability4
Producing a kilogram of S32803-ANN takes about 50 MJ of energy and emits 4.5 kg of CO₂ — less than 80% of stainless steel grades. Typical recycled content is 40%.
Manufacturability7
S32803-ANN's machinability is poor (28/100, worse than 79% of stainless steel grades); weldability fair (45/100); formability fair (50/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S32803-ANN
Is S32803 easy to machine?
Tough and work-hardening: use rigid setups, positive-rake carbide, heavy flood coolant, slow speeds and constant feed to avoid work-hardened glaze; expect ~35 % of AISI 1212 rates.
Can S32803 be welded?
GTAW/autogenous or matching high-alloy/Ni-base filler with argon shielding and strict low heat input; no post-weld grain refinement is possible, so restrict to thin wall and avoid the 475–600 °C range.
Can S32803 be formed, bent or molded?
Cold form thin-wall product with generous radii and allowance for higher yield and lower ductility than austenitic grades; hot work 900–1100 °C followed by anneal, never finish between 400–600 °C.
What surface finishes work on S32803?
Pickle and passivate per ASTM A967 (nitric or citric) after any thermal work; polishes well to a bright finish, no anodising, and avoid iron contamination from carbon-steel tooling.
S32803 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cextra-low carbon typical of superferritics; confirm against mill certificate | ≤ 0.03 | 0.02 |
| Ninterstitials (C+N) held low for toughness and intergranular corrosion resistance | ≤ 0.05 | 0.02 |
| Crapproximate 28 % Cr class level | 27.5 – 29.5 | 28.5 |
| Moapproximate; drives pitting/crevice resistance (PREN ≈ 38–42) | 2 – 3.5 | 2.8 |
| Nismall addition for toughness while remaining fully ferritic | ≤ 2.5 | 1 |
| Ti+Nbstabilisers to tie up C and N; nominal, grade-dependent | 0.1 – 0.8 | 0.4 |
| Mn | ≤ 1 | 0.3 |
| Si | ≤ 1 | 0.4 |
| P | ≤ 0.04 | — |
| S | ≤ 0.02 | — |
| Febalance; composition above is the nominal 28Cr–3Mo superferritic envelope — verify against the UNS registration / mill certificate before design | balance | — |
S32803-ANN — frequently asked
What is S32803-ANN used for?
S32803-ANN is typically used for oil country tubular goods (OCTG), downhole completion tubing and sour service components. In short: superferritic OCTG grade; no chloride SCC risk; 300 °C service ceiling.
What is the yield strength of S32803-ANN?
S32803-ANN has a typical yield strength of 520 MPa (75.4 ksi) and a tensile strength of 640 MPa (92.8 ksi) — stronger than 79% of stainless steel grades. Strength varies by condition: see the 6 listed tempers.
Is S32803-ANN easy to machine?
Not especially — machinability is rated poor (28/100, worse than 79% of stainless steel grades). Tough and work-hardening: use rigid setups, positive-rake carbide, heavy flood coolant, slow speeds and constant feed to avoid work-hardened glaze; expect ~35 % of AISI 1212 rates.
Can S32803-ANN be welded?
With care — weldability is rated fair (45/100). GTAW/autogenous or matching high-alloy/Ni-base filler with argon shielding and strict low heat input; no post-weld grain refinement is possible, so restrict to thin wall and avoid the 475–600 °C range.
What surface finishes work on S32803-ANN?
Pickle and passivate per ASTM A967 (nitric or citric) after any thermal work; polishes well to a bright finish, no anodising, and avoid iron contamination from carbon-steel tooling.
Can S32803-ANN be formed, bent or molded?
Cold form thin-wall product with generous radii and allowance for higher yield and lower ductility than austenitic grades; hot work 900–1100 °C followed by anneal, never finish between 400–600 °C.
What is the maximum service temperature of S32803-ANN?
S32803-ANN is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S32803-ANN and S32803 CW-125?
ANN is the default condition — standard stocked condition for tubing, pipe and plate; best corrosion resistance and toughness. CW-125: highest routinely supplied strength level; check hardness caps and CVN for sour-service qualification. Yield strength is 520 MPa in ANN versus 900 MPa in CW-125.
Sources
- ASTM A268/A268M — Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing — ASTM International (2022)
- ANSI/NACE MR0175 / ISO 15156-3 — Cracking-resistant CRAs for H2S-containing environments — NACE/ISO (2020)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (superferritic stainless steels) — ASM International (1990)
- Superferritic stainless tubing datasheets (26-3-3 / 29-4C / 29-4-2 class) used as property analogues — various mills (2020)
- ASTM A967/A967M — Chemical Passivation Treatments for Stainless Steel Parts — ASTM International (2017)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.