Steel 20Cr4 +C vs 20Cr4 +H
Steel · 20Cr4 temper comparison
20Cr4 +C and 20Cr4 +H are two conditions of the same steel grade, 20Cr4: +C (cold drawn) versus +H (supplied to specified hardenability (Jominy) band). The chemistry is identical, so every difference below comes from the condition. 20Cr4 +C is the stronger of the two: yield strength 570 MPa (82.7 ksi) against 360 MPa (52.2 ksi) for 20Cr4 +H, about 58% more; tensile strength follows at 700 MPa (102 ksi) vs 580 MPa (84.1 ksi). In exchange, 20Cr4 +H is the more ductile: elongation 23% versus 10% for 20Cr4 +C, and 20Cr4 +C is harder (215 HB vs 175 HB).
20Cr4 +CChoose it when strength drives the design.
20Cr4 +HChoose it when the part is bent, formed or impact-loaded.
20Cr4 +C vs 20Cr4 +H: 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, Rockwell B
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 0.29 · Fracture Toughness (K_IC) 90 MPa·√m81.9 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 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 44 W/m·K25.4 BTU/hr·ft·°F · Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.8 µm/m·K6.6 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 200°C392 °F · Min Service Temperature -25°C-13 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7.8 % IACS · Electrical Resistivity 2.2×10⁻⁷ Ω·m8.66 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 %)
Formability (cold)
Same in both: Weldability 55 / 100 · Castability 25 / 100 · Brazeability / Solderability 65 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 31 MJ/kg13,328 BTU/lb · Embodied Carbon (primary production) 2.1 kg CO₂/kg · Embodied Water 55 L/kg6.6 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.
20Cr4 +C vs 20Cr4 +H — frequently asked
Is 20Cr4 +C stronger than 20Cr4 +H?
Yes. 20Cr4 +C has a typical yield strength of 570 MPa (82.7 ksi) against 360 MPa (52.2 ksi) for 20Cr4 +H — about 58% more. Tensile strength is 700 MPa (102 ksi) vs 580 MPa (84.1 ksi).
Which condition does FabDigit quote by default, +C or +H?
+A is the default 20Cr4 condition in the FabDigit quote flow (neither +C nor +H). 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, 20Cr4 +C or 20Cr4 +H?
20Cr4 +C, by a small margin. Both rate good for machinability — 65/100 against 58/100 for 20Cr4 +H.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 20Cr4 +C and 20Cr4 +H 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.