Steel S50C Annealed vs S50C-HR
Steel · S50C temper comparison
S50C Annealed and S50C-HR are two conditions of the same steel grade, S50C: Annealed versus HR (hot rolled). The chemistry is identical, so every difference below comes from the condition. S50C-HR is the stronger of the two: tensile strength 690 MPa (100 ksi) against 636 MPa (92.2 ksi) for S50C Annealed, about 8% more. In exchange, S50C Annealed is the more ductile: elongation 24% versus 17% for S50C-HR, and S50C-HR is harder (197 HB vs 187 HB). On the shop floor, S50C Annealed machines more easily (good vs fair).
S50C AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
S50C-HRChoose it when strength drives the design.
S50C Annealed vs S50C-HR: 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
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 205 GPa29.7 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Compressive Strength 430 MPa62.4 ksi · Shear Strength 450 MPa65.3 ksi · Fracture Toughness (K_IC) 50 MPa·√m45.5 ksi·√in
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,480°C2,696 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 49 W/m·K28.3 BTU/hr·ft·°F · Specific Heat Capacity 486 J/kg·K0.12 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.7 µm/m·K6.5 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.
Same in both: Electrical Conductivity 10 % IACS · Electrical Resistivity 1.7×10⁻⁷ Ω·m6.69 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 V · Corrosion Resistance 12 / 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: Castability 55 / 100 · Brazeability / Solderability 60 / 100 · Polishability 55 / 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 kg CO₂/kg · Embodied Water 45 L/kg5.4 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.
S50C Annealed vs S50C-HR — frequently asked
Is S50C-HR stronger than S50C Annealed?
Yes. S50C-HR has a typical tensile strength of 690 MPa (100 ksi) against 636 MPa (92.2 ksi) for S50C Annealed — about 8% more.
Which condition does FabDigit quote by default, Annealed or HR?
Normalized is the default S50C condition in the FabDigit quote flow (neither Annealed nor HR). 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, S50C Annealed or S50C-HR?
S50C Annealed. Its machinability rates good (55/100) against fair (45/100) for S50C-HR; for welding the order is S50C Annealed first (fair, 40/100) then S50C-HR (fair, 35/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in S50C Annealed and S50C-HR 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.