Steel En30B Annealed vs En30B Carburized
Steel · En30B temper comparison
En30B Annealed and En30B Carburized are two conditions of the same steel grade, En30B: Annealed versus Carburized (carburized and hardened). The chemistry is identical, so every difference below comes from the condition. En30B Carburized is the stronger of the two: yield strength 1,020 MPa (148 ksi) against 550 MPa (79.8 ksi) for En30B Annealed, about 85% more; tensile strength follows at 1,200 MPa (174 ksi) vs 800 MPa (116 ksi). In exchange, En30B Annealed is the more ductile: elongation 20% versus 11% for En30B Carburized, and En30B Carburized is harder (340 HB vs 235 HB). En30B Annealed runs hotter in service (350°C vs 180°C continuous). On the shop floor, En30B Annealed machines more easily (fair vs not recommended).
En30B AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
En30B CarburizedChoose it when strength drives the design.
En30B Annealed vs En30B Carburized: 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.
En30B AnnealedEn30B Carburized
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 207 GPa30 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Compressive Strength 1,000 MPa145 ksi · Shear Strength 690 MPa100 ksi · Fracture Toughness (K_IC) 90 MPa·√m81.9 ksi·√in
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,495°C2,723 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 34 W/m·K19.6 BTU/hr·ft·°F · Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12 µm/m·K6.7 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -60°C-76 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 5.5 % IACS · Electrical Resistivity 3.1×10⁻⁷ Ω·m12.2 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 13 / 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 20 / 100 · Brazeability / Solderability 40 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 36 MJ/kg15,477 BTU/lb · Embodied Carbon (primary production) 2.5 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 35%
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.
En30B Annealed vs En30B Carburized — frequently asked
Is En30B Carburized stronger than En30B Annealed?
Yes. En30B Carburized has a typical yield strength of 1,020 MPa (148 ksi) against 550 MPa (79.8 ksi) for En30B Annealed — about 85% more. Tensile strength is 1,200 MPa (174 ksi) vs 800 MPa (116 ksi).
Which condition does FabDigit quote by default, Annealed or Carburized?
Cond W is the default En30B condition in the FabDigit quote flow (neither Annealed nor Carburized). 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, En30B Annealed or En30B Carburized?
En30B Annealed. Its machinability rates fair (40/100) against not recommended (8/100) for En30B Carburized.
Ready to make it?
Upload a CAD file and FabDigit prices the part in En30B Annealed and En30B Carburized 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.