Steel 14G2AF-QT vs 14G2AF TMCP
Steel · 14G2AF temper comparison
14G2AF-QT and 14G2AF TMCP are two conditions of the same steel grade, 14G2AF: QT (quenched and tempered) versus TMCP (thermomechanically controlled processed). The chemistry is identical, so every difference below comes from the condition. 14G2AF-QT is the stronger of the two: yield strength 540 MPa (78.3 ksi) against 460 MPa (66.7 ksi) for 14G2AF TMCP, about 17% more; tensile strength follows at 680 MPa (98.6 ksi) vs 600 MPa (87 ksi). In exchange, 14G2AF TMCP is the more ductile: elongation 24% versus 18% for 14G2AF-QT, and 14G2AF-QT is harder (210 HB vs 180 HB). On the shop floor, 14G2AF TMCP welds better (very good vs good).
14G2AF-QTChoose it when strength drives the design.
14G2AF TMCPChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
14G2AF-QT vs 14G2AF TMCP: 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
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Reduction in Area 55% · Compressive Strength 430 MPa62.4 ksi · Shear Strength 350 MPa50.8 ksi · Hardness, Rockwell B 87 HRB · Hardness, Vickers 178 HV
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,490°C2,714 °F · Liquidus Temperature 1,520°C2,768 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 46 W/m·K26.6 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 · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -70°C-94 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 8.5 % IACS · Electrical Resistivity 2×10⁻⁷ Ω·m7.87 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.65 V · Corrosion Resistance 12 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Machinability 52 / 100 · Castability 40 / 100 · Brazeability / Solderability 55 / 100 · Polishability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 2.1 kg CO₂/kg · Embodied Water 40 L/kg4.8 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.
14G2AF-QT vs 14G2AF TMCP — frequently asked
Is 14G2AF-QT stronger than 14G2AF TMCP?
Yes. 14G2AF-QT has a typical yield strength of 540 MPa (78.3 ksi) against 460 MPa (66.7 ksi) for 14G2AF TMCP — about 17% more. Tensile strength is 680 MPa (98.6 ksi) vs 600 MPa (87 ksi).
Which condition does FabDigit quote by default, QT or TMCP?
HR is the default 14G2AF condition in the FabDigit quote flow (neither QT nor TMCP). 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, 14G2AF-QT or 14G2AF TMCP?
14G2AF TMCP. Its weldability rates very good (82/100) against good (68/100) for 14G2AF-QT.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 14G2AF-QT and 14G2AF TMCP 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.