Steel M35 Annealed vs M35 Hardened & Tempered
Steel · M35 temper comparison
M35 Annealed and M35 Hardened & Tempered are two conditions of the same steel grade, M35: Annealed versus Hardened & Tempered (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. M35 Hardened & Tempered is the stronger of the two: tensile strength 2,200 MPa (319 ksi) against 900 MPa (131 ksi) for M35 Annealed, about 144% more. In exchange, M35 Annealed is the more ductile: elongation 10% versus 0.5% for M35 Hardened & Tempered, and M35 Hardened & Tempered is harder (65 HRC vs 24 HRC). M35 Hardened & Tempered runs hotter in service (600°C vs 400°C continuous). On the shop floor, M35 Annealed machines more easily (poor vs not recommended).
M35 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
M35 Hardened & TemperedChoose it when strength drives the design, or when the part sees heat.
M35 Annealed vs M35 Hardened & Tempered: 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.
M35 AnnealedM35 Hardened & Tempered
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
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: Shear Modulus 84 GPa12.2 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.29 · Yield Strength (0.2% offset) 600 MPa87 ksi · Reduction in Area 20% · Hardness, Brinell 248 HB · Hardness, Rockwell B 100 HRB
Physical
Density and transition temperatures.
Same in both: Density 8.1 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,260°C2,300 °F · Liquidus Temperature 1,420°C2,588 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 23 W/m·K13.3 BTU/hr·ft·°F · 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 · Min Service Temperature -50°C-58 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 3.1 % IACS · Electrical Resistivity 5.5×10⁻⁷ Ω·m21.7 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.55 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 %)
Polishability
Same in both: Weldability 20 / 100 · Formability (cold) 15 / 100 · Brazeability / Solderability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 60 MJ/kg25,795 BTU/lb · Embodied Carbon (primary production) 4.2 kg CO₂/kg · Embodied Water 90 L/kg10.8 gal/lb · Typical Recycled Content 35%
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.
M35 Annealed vs M35 Hardened & Tempered — frequently asked
Is M35 Hardened & Tempered stronger than M35 Annealed?
Yes. M35 Hardened & Tempered has a typical tensile strength of 2,200 MPa (319 ksi) against 900 MPa (131 ksi) for M35 Annealed — about 144% more.
Which condition does FabDigit quote by default, Annealed or Hardened & Tempered?
Annealed is the default M35 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, M35 Annealed or M35 Hardened & Tempered?
M35 Annealed. Its machinability rates poor (30/100) against not recommended (5/100) for M35 Hardened & Tempered.
Ready to make it?
Upload a CAD file and FabDigit prices the part in M35 Annealed and M35 Hardened & Tempered 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.