Stainless Steel 1.4945 +AT vs 1.4945 +AT+C
Stainless Steel · 1.4945 temper comparison
1.4945 +AT and 1.4945 +AT+C are two conditions of the same stainless steel grade, 1.4945: +AT (solution annealed) versus +AT+C (solution annealed then cold drawn bar/tube). The chemistry is identical, so every difference below comes from the condition. 1.4945 +AT+C is the stronger of the two: yield strength 600 MPa (87 ksi) against 320 MPa (46.4 ksi) for 1.4945 +AT, about 88% more; tensile strength follows at 830 MPa (120 ksi) vs 680 MPa (98.6 ksi). In exchange, 1.4945 +AT is the more ductile: elongation 40% versus 20% for 1.4945 +AT+C, and 1.4945 +AT+C is harder (250 HB vs 175 HB). 1.4945 +AT runs hotter in service (700°C vs 600°C continuous).
1.4945 +ATChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
1.4945 +AT+CChoose it when strength drives the design.
1.4945 +AT vs 1.4945 +AT+C: 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.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 197 GPa28.6 Msi · Shear Modulus 76 GPa11 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Compressive Strength 320 MPa46.4 ksi · Shear Strength 430 MPa62.4 ksi · Fatigue Strength (Endurance Limit) 270 MPa39.2 ksi · Fracture Toughness (K_IC) 200 MPa·√m182 ksi·√in · Hardness, Rockwell B 88 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.9 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,390°C2,534 °F · Liquidus Temperature 1,430°C2,606 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 14.5 W/m·K8.4 BTU/hr·ft·°F · Specific Heat Capacity 500 J/kg·K0.12 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 16 µm/m·K8.9 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 % IACS · Electrical Resistivity 8.5×10⁻⁷ Ω·m33.5 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 V · Corrosion Resistance 50 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 65 / 100 · Brazeability / Solderability 60 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 57 MJ/kg24,506 BTU/lb · Embodied Carbon (primary production) 5.2 kg CO₂/kg · Embodied Water 140 L/kg16.8 gal/lb · Typical Recycled Content 55%
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.
1.4945 +AT vs 1.4945 +AT+C — frequently asked
Is 1.4945 +AT+C stronger than 1.4945 +AT?
Yes. 1.4945 +AT+C has a typical yield strength of 600 MPa (87 ksi) against 320 MPa (46.4 ksi) for 1.4945 +AT — about 88% more. Tensile strength is 830 MPa (120 ksi) vs 680 MPa (98.6 ksi).
Which condition does FabDigit quote by default, +AT or +AT+C?
+AT is the default 1.4945 condition in the FabDigit quote flow. 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.
When should I choose 1.4945 +AT over 1.4945 +AT+C?
Pick 1.4945 +AT when the part is bent, formed or impact-loaded, or when the part sees heat. Pick 1.4945 +AT+C when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.4945 +AT and 1.4945 +AT+C 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.