Steel Nitralloy 135-CD vs Nitralloy 135 QT28-32
Steel · Nitralloy 135 temper comparison
Nitralloy 135-CD and Nitralloy 135 QT28-32 are two conditions of the same steel grade, Nitralloy 135: CD (cold drawn) versus QT28-32 (Q&T to 28–32 HRC). The chemistry is identical, so every difference below comes from the condition. Nitralloy 135 QT28-32 is the stronger of the two: yield strength 815 MPa (118 ksi) against 650 MPa (94.3 ksi) for Nitralloy 135-CD, about 25% more; tensile strength follows at 965 MPa (140 ksi) vs 830 MPa (120 ksi). Nitralloy 135 QT28-32 is the more ductile: elongation 17% versus 12% for Nitralloy 135-CD, and Nitralloy 135 QT28-32 is harder (302 HB vs 240 HB). Nitralloy 135 QT28-32 runs hotter in service (500°C vs 400°C continuous). On the shop floor, Nitralloy 135-CD machines more easily (45 vs 35 out of 100).
Nitralloy 135-CDChoose it when the part is machined in volume.
Nitralloy 135 QT28-32Choose it when strength drives the design, or when the part is bent, formed or impact-loaded.
Nitralloy 135-CD vs Nitralloy 135 QT28-32: 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.
Nitralloy 135-CDNitralloy 135 QT28-32
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, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 166 GPa24.1 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 7.8 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,490°C2,714 °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 465 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12 µm/m·K6.7 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -40°C-40 °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) -0.6 V · Corrosion Resistance 15 / 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 15 / 100 · Castability 20 / 100 · Brazeability / Solderability 30 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 32 MJ/kg13,758 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 60 L/kg7.2 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.
Nitralloy 135-CD vs Nitralloy 135 QT28-32 — frequently asked
Is Nitralloy 135 QT28-32 stronger than Nitralloy 135-CD?
Yes. Nitralloy 135 QT28-32 has a typical yield strength of 815 MPa (118 ksi) against 650 MPa (94.3 ksi) for Nitralloy 135-CD — about 25% more. Tensile strength is 965 MPa (140 ksi) vs 830 MPa (120 ksi).
Which condition does FabDigit quote by default, CD or QT28-32?
QT28-32 is the default Nitralloy 135 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, Nitralloy 135-CD or Nitralloy 135 QT28-32?
Nitralloy 135-CD, by a small margin. Both rate fair for machinability — 45/100 against 35/100 for Nitralloy 135 QT28-32.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Nitralloy 135-CD and Nitralloy 135 QT28-32 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.