Stainless Steel 4Cr13 Annealed vs 4Cr13-QT300
Stainless Steel · 4Cr13 temper comparison
4Cr13 Annealed and 4Cr13-QT300 are two conditions of the same stainless steel grade, 4Cr13: Annealed versus QT300 (Q&T 300 °C). The chemistry is identical, so every difference below comes from the condition. 4Cr13-QT300 is the stronger of the two: yield strength 1,350 MPa (196 ksi) against 380 MPa (55.1 ksi) for 4Cr13 Annealed, about 3.6 times as much; tensile strength follows at 1,650 MPa (239 ksi) vs 700 MPa (102 ksi). In exchange, 4Cr13 Annealed is the more ductile: elongation 22% versus 6% for 4Cr13-QT300, and 4Cr13-QT300 is harder (505 HV vs 225 HV). 4Cr13 Annealed runs hotter in service (500°C vs 250°C continuous). On the shop floor, 4Cr13 Annealed machines more easily (fair vs poor).
4Cr13 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
4Cr13-QT300Choose it when strength drives the design.
4Cr13 Annealed vs 4Cr13-QT300: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all stainless 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 stainless 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)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 78 GPa11.3 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.28 · Hardness, Brinell 217 HB · Hardness, Rockwell B 96 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.75 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,480°C2,696 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 24.9 W/m·K14.4 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 10.3 µm/m·K5.7 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -30°C-22 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 3.1 % IACS · Electrical Resistivity 5.5×10⁻⁷ Ω·m21.7 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.3 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Polishability
Same in both: Weldability 30 / 100 · Formability (cold) 35 / 100 · Brazeability / Solderability 40 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 46 MJ/kg19,776 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg · Embodied Water 80 L/kg9.6 gal/lb · Typical Recycled Content 55%
Strength versus weight
Yield strength against density for every stainless steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
4Cr13 Annealed vs 4Cr13-QT300 — frequently asked
Is 4Cr13-QT300 stronger than 4Cr13 Annealed?
Yes. 4Cr13-QT300 has a typical yield strength of 1,350 MPa (196 ksi) against 380 MPa (55.1 ksi) for 4Cr13 Annealed — about 3.6 times as much. Tensile strength is 1,650 MPa (239 ksi) vs 700 MPa (102 ksi).
Which condition does FabDigit quote by default, Annealed or QT300?
Annealed is the default 4Cr13 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 is easier to machine, 4Cr13 Annealed or 4Cr13-QT300?
4Cr13 Annealed. Its machinability rates fair (45/100) against poor (18/100) for 4Cr13-QT300.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 4Cr13 Annealed and 4Cr13-QT300 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.