Steel SCM420 Annealed vs SCM420-CR
Steel · SCM420 temper comparison
SCM420 Annealed and SCM420-CR are two conditions of the same steel grade, SCM420: Annealed versus CR (cold rolled). The chemistry is identical, so every difference below comes from the condition. SCM420-CR is the stronger of the two: yield strength 580 MPa (84.1 ksi) against 360 MPa (52.2 ksi) for SCM420 Annealed, about 61% more; tensile strength follows at 720 MPa (104 ksi) vs 560 MPa (81.2 ksi). In exchange, SCM420 Annealed is the more ductile: elongation 27% versus 14% for SCM420-CR, and SCM420-CR is harder (215 HB vs 163 HB). SCM420 Annealed runs hotter in service (400°C vs 300°C continuous).
SCM420 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
SCM420-CRChoose it when strength drives the design.
SCM420 Annealed vs SCM420-CR: 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)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Same in both: Elastic (Young's) Modulus 207 GPa30 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) 1,425°C2,597 °F · Liquidus Temperature 1,500°C2,732 °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 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.2 µm/m·K6.8 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -40°C-40 °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) -0.62 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: Brazeability / Solderability 65 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 30 MJ/kg12,898 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 55 L/kg6.6 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.
SCM420 Annealed vs SCM420-CR — frequently asked
Is SCM420-CR stronger than SCM420 Annealed?
Yes. SCM420-CR has a typical yield strength of 580 MPa (84.1 ksi) against 360 MPa (52.2 ksi) for SCM420 Annealed — about 61% more. Tensile strength is 720 MPa (104 ksi) vs 560 MPa (81.2 ksi).
Which condition does FabDigit quote by default, Annealed or CR?
HR is the default SCM420 condition in the FabDigit quote flow (neither Annealed nor CR). 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 welds better, SCM420 Annealed or SCM420-CR?
SCM420 Annealed. Its weldability rates good (60/100) against good (55/100) for SCM420-CR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in SCM420 Annealed and SCM420-CR 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.