Steel FDCrV OT-SR vs FDCrV-QT
Steel · FDCrV temper comparison
FDCrV OT-SR and FDCrV-QT are two conditions of the same steel grade, FDCrV: OT-SR versus QT (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. FDCrV OT-SR is the stronger of the two: yield strength 1,580 MPa (229 ksi) against 900 MPa (131 ksi) for FDCrV-QT, about 76% more; tensile strength follows at 1,720 MPa (249 ksi) vs 1,100 MPa (160 ksi). In exchange, FDCrV-QT is the more ductile: elongation 10% versus 6% for FDCrV OT-SR, and FDCrV OT-SR is harder (49 HRC vs 35 HRC). FDCrV-QT runs hotter in service (300°C vs 250°C continuous).
FDCrV OT-SRChoose it when strength drives the design.
FDCrV-QTChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
FDCrV OT-SR vs FDCrV-QT: 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.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Rockwell C
Same in both: Elastic (Young's) Modulus 206 GPa29.9 Msi · Shear Modulus 79.5 GPa11.5 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.3 · Hardness, Vickers 520 HV
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,490°C2,714 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 44 W/m·K25.4 BTU/hr·ft·°F · 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 -50°C-58 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 8 % IACS · Electrical Resistivity 2.1×10⁻⁷ Ω·m8.27 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 14 / 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 25 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 32 MJ/kg13,758 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 28%
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.
FDCrV OT-SR vs FDCrV-QT — frequently asked
Is FDCrV OT-SR stronger than FDCrV-QT?
Yes. FDCrV OT-SR has a typical yield strength of 1,580 MPa (229 ksi) against 900 MPa (131 ksi) for FDCrV-QT — about 76% more. Tensile strength is 1,720 MPa (249 ksi) vs 1,100 MPa (160 ksi).
Which condition does FabDigit quote by default, OT-SR or QT?
OT is the default FDCrV condition in the FabDigit quote flow (neither OT-SR nor QT). 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 welds better, FDCrV OT-SR or FDCrV-QT?
FDCrV-QT. Its weldability rates poor (15/100) against not recommended (10/100) for FDCrV OT-SR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in FDCrV OT-SR and FDCrV-QT 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.