Steel Cronidur 30-ANN vs Cronidur 30 H+DF+T250
Steel · Cronidur 30 temper comparison
Cronidur 30-ANN and Cronidur 30 H+DF+T250 are two conditions of the same steel grade, Cronidur 30: ANN (annealed) versus H+DF+T250 (hardened, deep-frozen and tempered 250 °C). The chemistry is identical, so every difference below comes from the condition. Cronidur 30 H+DF+T250 is the stronger of the two: yield strength 1,780 MPa (258 ksi) against 600 MPa (87 ksi) for Cronidur 30-ANN, about 197% more; tensile strength follows at 2,000 MPa (290 ksi) vs 900 MPa (131 ksi). In exchange, Cronidur 30-ANN is the more ductile: elongation 14% versus 5% for Cronidur 30 H+DF+T250, and Cronidur 30 H+DF+T250 is harder (58 HRC vs 26 HRC). Cronidur 30-ANN runs hotter in service (400°C vs 300°C continuous). On the shop floor, Cronidur 30-ANN machines more easily (poor vs not recommended).
Cronidur 30-ANNChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Cronidur 30 H+DF+T250Choose it when strength drives the design.
Cronidur 30-ANN vs Cronidur 30 H+DF+T250: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all 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 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.
Cronidur 30-ANNCronidur 30 H+DF+T250
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 78 GPa11.3 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 7.7 g/cm³0.28 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 16 W/m·K9.2 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 10.5 µm/m·K5.8 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -253°C-423 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.3 % IACS · Electrical Resistivity 7.5×10⁻⁷ Ω·m29.5 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.2 V
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 15 / 100 · Brazeability / Solderability 25 / 100 · Polishability 90 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 85 MJ/kg36,543 BTU/lb · Embodied Carbon (primary production) 5.5 kg CO₂/kg · Embodied Water 200 L/kg24 gal/lb · Typical Recycled Content 25%
Strength versus weight
Yield strength against density for every steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Cronidur 30-ANN vs Cronidur 30 H+DF+T250 — frequently asked
Is Cronidur 30 H+DF+T250 stronger than Cronidur 30-ANN?
Yes. Cronidur 30 H+DF+T250 has a typical yield strength of 1,780 MPa (258 ksi) against 600 MPa (87 ksi) for Cronidur 30-ANN — about 197% more. Tensile strength is 2,000 MPa (290 ksi) vs 900 MPa (131 ksi).
Which condition does FabDigit quote by default, ANN or H+DF+T250?
H+DF+T180 is the default Cronidur 30 condition in the FabDigit quote flow (neither ANN nor H+DF+T250). 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, Cronidur 30-ANN or Cronidur 30 H+DF+T250?
Cronidur 30-ANN. Its machinability rates poor (32/100) against not recommended (12/100) for Cronidur 30 H+DF+T250.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Cronidur 30-ANN and Cronidur 30 H+DF+T250 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.