Steel Nitralloy 135-A vs Nitralloy 135-HR
Steel · Nitralloy 135 temper comparison
Nitralloy 135-A and Nitralloy 135-HR are two conditions of the same steel grade, Nitralloy 135: A (solution annealed) versus HR (hot rolled). The chemistry is identical, so every difference below comes from the condition. Nitralloy 135-HR is the stronger of the two: yield strength 580 MPa (84.1 ksi) against 500 MPa (72.5 ksi) for Nitralloy 135-A, about 16% more; tensile strength follows at 900 MPa (131 ksi) vs 760 MPa (110 ksi). In exchange, Nitralloy 135-A is the more ductile: elongation 22% versus 16% for Nitralloy 135-HR, and Nitralloy 135-HR is harder (270 HB vs 220 HB). Nitralloy 135-A runs hotter in service (500°C vs 450°C continuous). On the shop floor, Nitralloy 135-A machines more easily (fair vs poor).
Nitralloy 135-AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Nitralloy 135-HRChoose it when strength drives the design.
Nitralloy 135-A vs Nitralloy 135-HR: 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-ANitralloy 135-HR
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 %)
Weldability
Formability (cold)
Same in both: 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-A vs Nitralloy 135-HR — frequently asked
Is Nitralloy 135-HR stronger than Nitralloy 135-A?
Yes. Nitralloy 135-HR has a typical yield strength of 580 MPa (84.1 ksi) against 500 MPa (72.5 ksi) for Nitralloy 135-A — about 16% more. Tensile strength is 900 MPa (131 ksi) vs 760 MPa (110 ksi).
Which condition does FabDigit quote by default, A or HR?
QT28-32 is the default Nitralloy 135 condition in the FabDigit quote flow (neither A nor HR). 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-A or Nitralloy 135-HR?
Nitralloy 135-A. Its machinability rates fair (45/100) against poor (33/100) for Nitralloy 135-HR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Nitralloy 135-A and Nitralloy 135-HR 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.