Stainless Steel 309 Annealed vs 309 As Welded
Stainless Steel · 309 temper comparison
309 Annealed and 309 As Welded are two conditions of the same stainless steel grade, 309: Annealed versus As Welded (as-welded deposit). The chemistry is identical, so every difference below comes from the condition. 309 As Welded is the stronger of the two: yield strength 400 MPa (58 ksi) against 295 MPa (42.8 ksi) for 309 Annealed, about 36% more. In exchange, 309 Annealed is the more ductile: elongation 45% versus 35% for 309 As Welded, and 309 As Welded is harder (190 HB vs 160 HB). 309 Annealed runs hotter in service (1,050°C vs 800°C continuous).
309 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
309 As WeldedChoose it when strength drives the design.
309 Annealed vs 309 As Welded: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all stainless steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all stainless steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 150 GPa21.8 Msi · Poisson's Ratio 0.28
Physical
Density and transition temperatures.
Same in both: Density 7.9 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °F · Liquidus Temperature 1,450°C2,642 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 500 J/kg·K0.12 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 14.9 µm/m·K8.3 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.2 % IACS · Electrical Resistivity 7.8×10⁻⁷ Ω·m30.7 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.08 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Castability 55 / 100 · Brazeability / Solderability 60 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 56 MJ/kg24,076 BTU/lb · Embodied Carbon (primary production) 6 kg CO₂/kg · Embodied Water 150 L/kg18 gal/lb · Typical Recycled Content 60%
Strength versus weight
Yield strength against density for every stainless steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
309 Annealed vs 309 As Welded — frequently asked
Is 309 As Welded stronger than 309 Annealed?
Yes. 309 As Welded has a typical yield strength of 400 MPa (58 ksi) against 295 MPa (42.8 ksi) for 309 Annealed — about 36% more. Tensile strength is 590 MPa (85.6 ksi) vs 600 MPa (87 ksi).
Which condition does FabDigit quote by default, Annealed or As Welded?
Solution Annealed is the default 309 condition in the FabDigit quote flow (neither Annealed nor As Welded). The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, 309 Annealed or 309 As Welded?
309 Annealed. Its machinability rates fair (36/100) against poor (30/100) for 309 As Welded.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 309 Annealed and 309 As Welded side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.