Steel Q235D-A vs Q235D TMCP
Steel · Q235D temper comparison
Q235D-A and Q235D TMCP are two conditions of the same steel grade, Q235D: A (solution annealed) versus TMCP (thermomechanically controlled processed). The chemistry is identical, so every difference below comes from the condition. Q235D TMCP is the stronger of the two: yield strength 290 MPa (42.1 ksi) against 240 MPa (34.8 ksi) for Q235D-A, about 21% more; tensile strength follows at 450 MPa (65.3 ksi) vs 400 MPa (58 ksi). Q235D TMCP is harder — 135 HB against 115 HB for Q235D-A — which matters for wear surfaces and threads.
Q235D TMCPChoose it when strength drives the design, or when surface hardness matters.
Q235D-A vs Q235D 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
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 206 GPa29.9 Msi · Shear Modulus 79 GPa11.5 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,495°C2,723 °F · Liquidus Temperature 1,520°C2,768 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 480 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 250 J/g107 BTU/lb · Max Service Temperature (continuous) 350°C662 °F · Min Service Temperature -20°C-4 °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) -0.65 V · Corrosion Resistance 10 / 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 60 / 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 45 L/kg5.4 gal/lb · Typical Recycled Content 22%
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.
Q235D-A vs Q235D TMCP — frequently asked
Is Q235D TMCP stronger than Q235D-A?
Yes. Q235D TMCP has a typical yield strength of 290 MPa (42.1 ksi) against 240 MPa (34.8 ksi) for Q235D-A — about 21% more. Tensile strength is 450 MPa (65.3 ksi) vs 400 MPa (58 ksi).
Which condition does FabDigit quote by default, A or TMCP?
HR is the default Q235D condition in the FabDigit quote flow (neither A 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 is easier to machine, Q235D-A or Q235D TMCP?
Q235D TMCP, by a small margin. Both rate good for machinability — 68/100 against 62/100 for Q235D-A.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Q235D-A and Q235D 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.