Steel SGHC-O vs SGHC-SP
Steel · SGHC temper comparison
SGHC-O and SGHC-SP are two conditions of the same steel grade, SGHC: O (annealed) versus SP (skin-passed (temper-rolled) condition). The chemistry is identical, so every difference below comes from the condition. SGHC-SP is the stronger of the two: yield strength 255 MPa (37 ksi) against 240 MPa (34.8 ksi) for SGHC-O, about 6% more. SGHC-SP is harder — 100 HB against 95 HB for SGHC-O — which matters for wear surfaces and threads. SGHC-SP runs hotter in service (200°C vs 150°C continuous).
SGHC-SPChoose it when strength drives the design, or when surface hardness matters.
SGHC-O vs SGHC-SP: 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
Shear Strength
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
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 1,525°C2,777 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 52 W/m·K30 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 247 J/g106 BTU/lb · Min Service Temperature -30°C-22 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 11 % IACS · Electrical Resistivity 1.6×10⁻⁷ Ω·m6.3 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -1.03 V
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 64 / 100 · Brazeability / Solderability 55 / 100 · Polishability 25 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 28 MJ/kg12,038 BTU/lb · Embodied Carbon (primary production) 2.4 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.
SGHC-O vs SGHC-SP — frequently asked
Is SGHC-SP stronger than SGHC-O?
Yes. SGHC-SP has a typical yield strength of 255 MPa (37 ksi) against 240 MPa (34.8 ksi) for SGHC-O — about 6% more. Tensile strength is 320 MPa (46.4 ksi) vs 310 MPa (45 ksi).
Which condition does FabDigit quote by default, O or SP?
Specify the condition in the material field or the drawing note; FabDigit prices the quote for the state you call out.
Which welds better, SGHC-O or SGHC-SP?
SGHC-SP. Its weldability rates good (60/100) against fair (52/100) for SGHC-O.
Ready to make it?
Upload a CAD file and FabDigit prices the part in SGHC-O and SGHC-SP 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.