Steel GCr4-A vs GCr4-CD
Steel · GCr4 temper comparison
GCr4-A and GCr4-CD are two conditions of the same steel grade, GCr4: A (solution annealed) versus CD (cold drawn). The chemistry is identical, so every difference below comes from the condition. GCr4-CD is the stronger of the two: yield strength 600 MPa (87 ksi) against 390 MPa (56.6 ksi) for GCr4-A, about 54% more; tensile strength follows at 780 MPa (113 ksi) vs 640 MPa (92.8 ksi). In exchange, GCr4-A is the more ductile: elongation 21% versus 10% for GCr4-CD, and GCr4-CD is harder (225 HB vs 190 HB). GCr4-A runs hotter in service (250°C vs 200°C continuous).
GCr4-AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
GCr4-CDChoose it when strength drives the design.
GCr4-A vs GCr4-CD: 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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.3
Physical
Density and transition temperatures.
Same in both: Density 7.81 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,455°C2,651 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 44 W/m·K25.4 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.9 µm/m·K6.6 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -60°C-76 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Same in both: Electrical Conductivity 7 % IACS
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 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 30 / 100 · Brazeability / Solderability 35 / 100 · Polishability 85 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 31 MJ/kg13,328 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 60 L/kg7.2 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.
GCr4-A vs GCr4-CD — frequently asked
Is GCr4-CD stronger than GCr4-A?
Yes. GCr4-CD has a typical yield strength of 600 MPa (87 ksi) against 390 MPa (56.6 ksi) for GCr4-A — about 54% more. Tensile strength is 780 MPa (113 ksi) vs 640 MPa (92.8 ksi).
Which condition does FabDigit quote by default, A or CD?
A is the default GCr4 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.
When should I choose GCr4-A over GCr4-CD?
Pick GCr4-A when the part is bent, formed or impact-loaded, or when the part sees heat. Pick GCr4-CD when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in GCr4-A and GCr4-CD 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.