Steel M36 Annealed vs M36 H&T 67-68 HRC
Steel · M36 temper comparison
M36 Annealed and M36 H&T 67-68 HRC are two conditions of the same steel grade, M36: Annealed versus H&T 67-68 HRC (hardened & Tempered to maximum hardness). The chemistry is identical, so every difference below comes from the condition. M36 H&T 67-68 HRC is the stronger of the two: yield strength 2,000 MPa (290 ksi) against 550 MPa (79.8 ksi) for M36 Annealed, about 3.6 times as much; tensile strength follows at 2,100 MPa (305 ksi) vs 880 MPa (128 ksi). In exchange, M36 Annealed is the more ductile: elongation 14% versus 0.5% for M36 H&T 67-68 HRC, and M36 H&T 67-68 HRC is harder (750 HB vs 248 HB). M36 H&T 67-68 HRC runs hotter in service (620°C vs 500°C continuous). On the shop floor, M36 Annealed machines more easily (poor vs not recommended) and M36 Annealed welds better (poor vs not recommended).
M36 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
M36 H&T 67-68 HRCChoose it when strength drives the design, or when the part sees heat.
M36 Annealed vs M36 H&T 67-68 HRC: 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.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Vickers
Same in both: Shear Modulus 84 GPa12.2 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.28 · Hardness, Rockwell B 100 HRB
Physical
Density and transition temperatures.
Same in both: Density 8.19 g/cm³0.3 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °F · Liquidus Temperature 1,455°C2,651 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 420 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11 µm/m·K6.1 µin/in·°F · Latent Heat of Fusion 260 J/g112 BTU/lb · Min Service Temperature -50°C-58 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
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: Castability 25 / 100 · Brazeability / Solderability 55 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 70 MJ/kg30,095 BTU/lb · Embodied Carbon (primary production) 4.6 kg CO₂/kg · Embodied Water 90 L/kg10.8 gal/lb · Typical Recycled Content 30%
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.
M36 Annealed vs M36 H&T 67-68 HRC — frequently asked
Is M36 H&T 67-68 HRC stronger than M36 Annealed?
Yes. M36 H&T 67-68 HRC has a typical yield strength of 2,000 MPa (290 ksi) against 550 MPa (79.8 ksi) for M36 Annealed — about 3.6 times as much. Tensile strength is 2,100 MPa (305 ksi) vs 880 MPa (128 ksi).
Which condition does FabDigit quote by default, Annealed or H&T 67-68 HRC?
Annealed is the default M36 condition in the FabDigit quote flow. 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, M36 Annealed or M36 H&T 67-68 HRC?
M36 Annealed. Its machinability rates poor (26/100) against not recommended (5/100) for M36 H&T 67-68 HRC; for welding the order is M36 Annealed first (poor, 15/100) then M36 H&T 67-68 HRC (not recommended, 5/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in M36 Annealed and M36 H&T 67-68 HRC 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.