Steel CPM S30V Q&T vs CPM S30V Stress Relieved
Steel · CPM S30V temper comparison
CPM S30V Q&T and CPM S30V Stress Relieved are two conditions of the same steel grade, CPM S30V: Q&T (quenched and tempered) versus Stress Relieved. The chemistry is identical, so every difference below comes from the condition. CPM S30V Q&T is the stronger of the two: yield strength 1,800 MPa (261 ksi) against 725 MPa (105 ksi) for CPM S30V Stress Relieved, about 148% more; tensile strength follows at 2,050 MPa (297 ksi) vs 970 MPa (141 ksi). In exchange, CPM S30V Stress Relieved is the more ductile: elongation 7% versus 1% for CPM S30V Q&T, and CPM S30V Q&T is harder (60 HRC vs 24 HRC). On the shop floor, CPM S30V Stress Relieved machines more easily (poor vs not recommended).
CPM S30V Q&TChoose it when strength drives the design.
CPM S30V Stress RelievedChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
CPM S30V Q&T vs CPM S30V Stress Relieved: 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.
CPM S30V Q&TCPM S30V Stress Relieved
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 221 GPa32.1 Msi · Shear Modulus 85 GPa12.3 Msi · Poisson's Ratio 0.28 · Fracture Toughness (K_IC) 24 MPa·√m21.8 ksi·√in
Physical
Density and transition temperatures.
Same in both: Density 7.44 g/cm³0.27 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.
Same in both: Thermal Conductivity 20 W/m·K11.6 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 10.4 µm/m·K5.8 µin/in·°F · Max Service Temperature (continuous) 250°C482 °F · Min Service Temperature -70°C-94 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 6.5×10⁻⁷ Ω·m25.6 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 58 / 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 10 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 70 MJ/kg30,095 BTU/lb · Embodied Carbon (primary production) 5.5 kg CO₂/kg · Embodied Water 100 L/kg12 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.
CPM S30V Q&T vs CPM S30V Stress Relieved — frequently asked
Is CPM S30V Q&T stronger than CPM S30V Stress Relieved?
Yes. CPM S30V Q&T has a typical yield strength of 1,800 MPa (261 ksi) against 725 MPa (105 ksi) for CPM S30V Stress Relieved — about 148% more. Tensile strength is 2,050 MPa (297 ksi) vs 970 MPa (141 ksi).
Which condition does FabDigit quote by default, Q&T or Stress Relieved?
Annealed is the default CPM S30V condition in the FabDigit quote flow (neither Q&T nor Stress Relieved). 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, CPM S30V Q&T or CPM S30V Stress Relieved?
CPM S30V Stress Relieved. Its machinability rates poor (19/100) against not recommended (6/100) for CPM S30V Q&T.
Ready to make it?
Upload a CAD file and FabDigit prices the part in CPM S30V Q&T and CPM S30V Stress Relieved 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.