Steel 30CrMnSiNi2A Annealed vs 30CrMnSiNi2A-QT400
Steel · 30CrMnSiNi2A temper comparison
30CrMnSiNi2A Annealed and 30CrMnSiNi2A-QT400 are two conditions of the same steel grade, 30CrMnSiNi2A: Annealed versus QT400 (Q&T 400 °C). The chemistry is identical, so every difference below comes from the condition. 30CrMnSiNi2A-QT400 is the stronger of the two: yield strength 1,350 MPa (196 ksi) against 560 MPa (81.2 ksi) for 30CrMnSiNi2A Annealed, about 141% more; tensile strength follows at 1,500 MPa (218 ksi) vs 800 MPa (116 ksi). In exchange, 30CrMnSiNi2A Annealed is the more ductile: elongation 18% versus 12% for 30CrMnSiNi2A-QT400, and 30CrMnSiNi2A Annealed is harder (48 HRC vs 44 HRC). 30CrMnSiNi2A Annealed runs hotter in service (400°C vs 350°C continuous). On the shop floor, 30CrMnSiNi2A Annealed machines more easily (fair vs poor).
30CrMnSiNi2A AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
30CrMnSiNi2A-QT400Choose it when strength drives the design.
30CrMnSiNi2A Annealed vs 30CrMnSiNi2A-QT400: 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.
30CrMnSiNi2A Annealed30CrMnSiNi2A-QT400
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
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 160 GPa23.2 Msi · Poisson's Ratio 0.3 · Reduction in Area 48%
Physical
Density and transition temperatures.
Same in both: Density 7.8 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,490°C2,714 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.5 µm/m·K6.4 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -60°C-76 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 12 / 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 30 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 34 MJ/kg14,617 BTU/lb · Embodied Carbon (primary production) 2.5 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 20%
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.
30CrMnSiNi2A Annealed vs 30CrMnSiNi2A-QT400 — frequently asked
Is 30CrMnSiNi2A-QT400 stronger than 30CrMnSiNi2A Annealed?
Yes. 30CrMnSiNi2A-QT400 has a typical yield strength of 1,350 MPa (196 ksi) against 560 MPa (81.2 ksi) for 30CrMnSiNi2A Annealed — about 141% more. Tensile strength is 1,500 MPa (218 ksi) vs 800 MPa (116 ksi).
Which condition does FabDigit quote by default, Annealed or QT400?
QT260 is the default 30CrMnSiNi2A condition in the FabDigit quote flow (neither Annealed nor QT400). 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, 30CrMnSiNi2A Annealed or 30CrMnSiNi2A-QT400?
30CrMnSiNi2A Annealed. Its machinability rates fair (48/100) against poor (26/100) for 30CrMnSiNi2A-QT400.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 30CrMnSiNi2A Annealed and 30CrMnSiNi2A-QT400 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.