Steel 15Cr3 +A vs 15Cr3-CH
Steel · 15Cr3 temper comparison
15Cr3 +A and 15Cr3-CH are two conditions of the same steel grade, 15Cr3: +A (annealed) versus CH (carburized and hardened). The chemistry is identical, so every difference below comes from the condition. 15Cr3-CH is the stronger of the two: yield strength 440 MPa (63.8 ksi) against 300 MPa (43.5 ksi) for 15Cr3 +A, about 47% more; tensile strength follows at 760 MPa (110 ksi) vs 520 MPa (75.4 ksi). In exchange, 15Cr3 +A is the more ductile: elongation 22% versus 11% for 15Cr3-CH, and 15Cr3-CH is harder (720 HV vs 163 HV). 15Cr3 +A runs hotter in service (200°C vs 180°C continuous). On the shop floor, 15Cr3 +A welds better (good vs poor).
15Cr3 +AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
15Cr3-CHChoose it when strength drives the design.
15Cr3 +A vs 15Cr3-CH: 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
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
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 · Shear Strength 340 MPa49.3 ksi · Hardness, Brinell 155 HB · Hardness, Rockwell B 82 HRB
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.
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) 11.6 µm/m·K6.4 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 8.5 % IACS · Electrical Resistivity 2×10⁻⁷ Ω·m7.87 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 Rating (AISI 1212 = 100 %)
Weldability
Polishability
Same in both: Machinability 62 / 100 · Formability (cold) 75 / 100 · Brazeability / Solderability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 29 MJ/kg12,468 BTU/lb · Embodied Carbon (primary production) 2.1 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.
15Cr3 +A vs 15Cr3-CH — frequently asked
Is 15Cr3-CH stronger than 15Cr3 +A?
Yes. 15Cr3-CH has a typical yield strength of 440 MPa (63.8 ksi) against 300 MPa (43.5 ksi) for 15Cr3 +A — about 47% more. Tensile strength is 760 MPa (110 ksi) vs 520 MPa (75.4 ksi).
Which condition does FabDigit quote by default, +A or CH?
+A is the default 15Cr3 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.
Which welds better, 15Cr3 +A or 15Cr3-CH?
15Cr3 +A. Its weldability rates good (68/100) against poor (15/100) for 15Cr3-CH.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 15Cr3 +A and 15Cr3-CH 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.