Steel 1.2343 Q&T 40-44 HRC vs 1.2343 Stress Relieved
Steel · 1.2343 temper comparison
1.2343 Q&T 40-44 HRC and 1.2343 Stress Relieved are two conditions of the same steel grade, 1.2343: Q&T 40-44 HRC (hardened ~1000–1030 °C, double tempered ~600–620 °C) versus Stress Relieved. The chemistry is identical, so every difference below comes from the condition. 1.2343 Q&T 40-44 HRC is the stronger of the two: yield strength 1,150 MPa (167 ksi) against 495 MPa (71.8 ksi) for 1.2343 Stress Relieved, about 132% more; tensile strength follows at 1,350 MPa (196 ksi) vs 790 MPa (115 ksi). In exchange, 1.2343 Stress Relieved is the more ductile: elongation 16% versus 12% for 1.2343 Q&T 40-44 HRC, and 1.2343 Q&T 40-44 HRC is harder (42 HRC vs 15 HRC). 1.2343 Q&T 40-44 HRC runs hotter in service (550°C vs 400°C continuous). On the shop floor, 1.2343 Stress Relieved machines more easily (fair vs poor).
1.2343 Q&T 40-44 HRCChoose it when strength drives the design, or when the part sees heat.
1.2343 Stress RelievedChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
1.2343 Q&T 40-44 HRC vs 1.2343 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.
1.2343 Q&T 40-44 HRC1.2343 Stress Relieved
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 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 170 GPa24.7 Msi · Poisson's Ratio 0.3 · Reduction in Area 42% · Hardness, Brinell 205 HB · Hardness, Rockwell B 94 HRB
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 1,470°C2,678 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 24.5 W/m·K14.2 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.9 µm/m·K6.6 µin/in·°F · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 3.3 % IACS · Electrical Resistivity 5.2×10⁻⁷ Ω·m20.5 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 18 / 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 45 / 100 · Castability 30 / 100 · Brazeability / Solderability 40 / 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 40%
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.
1.2343 Q&T 40-44 HRC vs 1.2343 Stress Relieved — frequently asked
Is 1.2343 Q&T 40-44 HRC stronger than 1.2343 Stress Relieved?
Yes. 1.2343 Q&T 40-44 HRC has a typical yield strength of 1,150 MPa (167 ksi) against 495 MPa (71.8 ksi) for 1.2343 Stress Relieved — about 132% more. Tensile strength is 1,350 MPa (196 ksi) vs 790 MPa (115 ksi).
Which condition does FabDigit quote by default, Q&T 40-44 HRC or Stress Relieved?
Annealed is the default 1.2343 condition in the FabDigit quote flow (neither Q&T 40-44 HRC 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, 1.2343 Q&T 40-44 HRC or 1.2343 Stress Relieved?
1.2343 Stress Relieved. Its machinability rates fair (46/100) against poor (25/100) for 1.2343 Q&T 40-44 HRC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.2343 Q&T 40-44 HRC and 1.2343 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.