Stainless Steel 1.4650 A2-70 vs 1.4650 +AT
Stainless Steel · 1.4650 temper comparison
1.4650 A2-70 and 1.4650 +AT are two conditions of the same stainless steel grade, 1.4650: A2-70 (cold-headed fastener, ISO 3506 property class 70) versus +AT (solution annealed). The chemistry is identical, so every difference below comes from the condition. 1.4650 A2-70 is the stronger of the two: yield strength 520 MPa (75.4 ksi) against 220 MPa (31.9 ksi) for 1.4650 +AT, about 136% more; tensile strength follows at 760 MPa (110 ksi) vs 570 MPa (82.7 ksi). In exchange, 1.4650 +AT is the more ductile: elongation 50% versus 20% for 1.4650 A2-70, and 1.4650 A2-70 is harder (225 HB vs 150 HB). 1.4650 +AT runs hotter in service (400°C vs 300°C continuous).
1.4650 A2-70Choose it when strength drives the design.
1.4650 +ATChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
1.4650 A2-70 vs 1.4650 +AT: 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 145 GPa21 Msi · Poisson's Ratio 0.29
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.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 15 W/m·K8.7 BTU/hr·ft·°F · Specific Heat Capacity 500 J/kg·K0.12 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 16.5 µm/m·K9.2 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 2.4 % IACS · Electrical Resistivity 7.3×10⁻⁷ Ω·m28.7 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.08 V · Corrosion Resistance 65 / 100
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: Brazeability / Solderability 70 / 100 · Polishability 85 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 57 MJ/kg24,506 BTU/lb · Embodied Carbon (primary production) 4.5 kg CO₂/kg · Embodied Water 130 L/kg15.6 gal/lb · Typical Recycled Content 65%
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.
1.4650 A2-70 vs 1.4650 +AT — frequently asked
Is 1.4650 A2-70 stronger than 1.4650 +AT?
Yes. 1.4650 A2-70 has a typical yield strength of 520 MPa (75.4 ksi) against 220 MPa (31.9 ksi) for 1.4650 +AT — about 136% more. Tensile strength is 760 MPa (110 ksi) vs 570 MPa (82.7 ksi).
Which condition does FabDigit quote by default, A2-70 or +AT?
+AT is the default 1.4650 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.
Which is easier to machine, 1.4650 A2-70 or 1.4650 +AT?
1.4650 A2-70, by a small margin. Both rate fair for machinability — 46/100 against 40/100 for 1.4650 +AT.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.4650 A2-70 and 1.4650 +AT 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.