Nickel Alloy M30H-HT vs M30H-ST
Nickel Alloy · M30H temper comparison
M30H-HT and M30H-ST are two conditions of the same nickel alloy grade, M30H: HT (solution treated and age hardened (≈595 °C precipitation treatment) per…) versus ST (solution annealed). The chemistry is identical, so every difference below comes from the condition. M30H-HT is the stronger of the two: yield strength 520 MPa (75.4 ksi) against 300 MPa (43.5 ksi) for M30H-ST, about 73% more; tensile strength follows at 740 MPa (107 ksi) vs 540 MPa (78.3 ksi). In exchange, M30H-ST is the more ductile: elongation 25% versus 15% for M30H-HT, and M30H-HT is harder (290 HB vs 180 HB). M30H-ST conducts electricity better (3 % IACS vs 2.5 % IACS). On the shop floor, M30H-ST machines more easily (32 vs 18 out of 100).
M30H-HTChoose it when strength drives the design.
M30H-STChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
M30H-HT vs M30H-ST: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all nickel alloy 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 nickel alloy 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
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 172 GPa24.9 Msi · Shear Modulus 66 GPa9.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.32 · Hardness, Rockwell C 30 HRC
Physical
Density and transition temperatures.
Same in both: Density 8.3 g/cm³0.3 lb/in³ · Melting Point (Solidus) 1,180°C2,156 °F · Liquidus Temperature 1,290°C2,354 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 430 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 13.7 µm/m·K7.6 µin/in·°F · Latent Heat of Fusion 280 J/g120 BTU/lb · Max Service Temperature (continuous) 480°C896 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.15 V
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 80 / 100 · Brazeability / Solderability 50 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 130 MJ/kg55,890 BTU/lb · Embodied Carbon (primary production) 11 kg CO₂/kg · Embodied Water 210 L/kg25.2 gal/lb · Typical Recycled Content 40%
Strength versus weight
Yield strength against density for every nickel alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
M30H-HT vs M30H-ST — frequently asked
Is M30H-HT stronger than M30H-ST?
Yes. M30H-HT has a typical yield strength of 520 MPa (75.4 ksi) against 300 MPa (43.5 ksi) for M30H-ST — about 73% more. Tensile strength is 740 MPa (107 ksi) vs 540 MPa (78.3 ksi).
Which condition does FabDigit quote by default, HT or ST?
HT is the default M30H 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, M30H-HT or M30H-ST?
M30H-ST, by a small margin. Both rate poor for machinability — 32/100 against 18/100 for M30H-HT; for welding the order is M30H-ST first (poor, 30/100) then M30H-HT (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in M30H-HT and M30H-ST 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.