Stainless Steel 1.4568 +AT vs 1.4568-CH900
Stainless Steel · 1.4568 temper comparison
1.4568 +AT and 1.4568-CH900 are two conditions of the same stainless steel grade, 1.4568: +AT (solution annealed) versus CH900 (cold rolled (Condition C) then aged 480 °C/1 h). The chemistry is identical, so every difference below comes from the condition. 1.4568-CH900 is the stronger of the two: yield strength 1,655 MPa (240 ksi) against 275 MPa (39.9 ksi) for 1.4568 +AT, about 6.0 times as much; tensile strength follows at 1,790 MPa (260 ksi) vs 895 MPa (130 ksi). In exchange, 1.4568 +AT is the more ductile: elongation 35% versus 2% for 1.4568-CH900, and 1.4568-CH900 is harder (490 HV vs 175 HV). On the shop floor, 1.4568 +AT machines more easily (fair vs poor) and 1.4568 +AT welds better (good vs poor).
1.4568 +ATChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
1.4568-CH900Choose it when strength drives the design.
1.4568 +AT vs 1.4568-CH900: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Vickers
Same in both: Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.28 · Reduction in Area 60% · Compressive Strength 290 MPa42.1 ksi · Hardness, Brinell 165 HB · Hardness, Rockwell B 85 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.81 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °F · Liquidus Temperature 1,440°C2,624 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 16.4 W/m·K9.5 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11 µm/m·K6.1 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 8×10⁻⁷ Ω·m31.5 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.15 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: Brazeability / Solderability 50 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 53 MJ/kg22,786 BTU/lb · Embodied Carbon (primary production) 5 kg CO₂/kg · Embodied Water 200 L/kg24 gal/lb · Typical Recycled Content 45%
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.
1.4568 +AT vs 1.4568-CH900 — frequently asked
Is 1.4568-CH900 stronger than 1.4568 +AT?
Yes. 1.4568-CH900 has a typical yield strength of 1,655 MPa (240 ksi) against 275 MPa (39.9 ksi) for 1.4568 +AT — about 6.0 times as much. Tensile strength is 1,790 MPa (260 ksi) vs 895 MPa (130 ksi).
Which condition does FabDigit quote by default, +AT or CH900?
+AT is the default 1.4568 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, 1.4568 +AT or 1.4568-CH900?
1.4568 +AT. Its machinability rates fair (40/100) against poor (18/100) for 1.4568-CH900; for welding the order is 1.4568 +AT first (good, 65/100) then 1.4568-CH900 (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.4568 +AT and 1.4568-CH900 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.