Steel E80C-Ni2-M21 vs E80C-Ni2 PWHT
Steel · E80C-Ni2 temper comparison
E80C-Ni2-M21 and E80C-Ni2 PWHT are two conditions of the same steel grade, E80C-Ni2: M21 (M21 shielding) versus PWHT (post-weld heat treated). The chemistry is identical, so every difference below comes from the condition. E80C-Ni2-M21 is the stronger of the two: yield strength 540 MPa (78.3 ksi) against 495 MPa (71.8 ksi) for E80C-Ni2 PWHT, about 9% more; tensile strength follows at 630 MPa (91.4 ksi) vs 590 MPa (85.6 ksi). E80C-Ni2-M21 is harder — 194 HB against 178 HB for E80C-Ni2 PWHT — which matters for wear surfaces and threads.
E80C-Ni2-M21Choose it when strength drives the design, or when surface hardness matters.
E80C-Ni2-M21 vs E80C-Ni2 PWHT: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 205 GPa29.7 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,450°C2,642 °F · Liquidus Temperature 1,510°C2,750 °F
Thermal
How each material carries heat and how hot it can run.
Min Service Temperature
Same in both: Thermal Conductivity 40 W/m·K23.1 BTU/hr·ft·°F · Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.5 µm/m·K6.9 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Max Service Temperature (continuous) 400°C752 °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) -0.62 V · Corrosion Resistance 13 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Same in both: Weldability 88 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 36 MJ/kg15,477 BTU/lb · Embodied Carbon (primary production) 2.6 kg CO₂/kg · Embodied Water 70 L/kg8.4 gal/lb · Typical Recycled Content 20%
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.
E80C-Ni2-M21 vs E80C-Ni2 PWHT — frequently asked
Is E80C-Ni2-M21 stronger than E80C-Ni2 PWHT?
Yes. E80C-Ni2-M21 has a typical yield strength of 540 MPa (78.3 ksi) against 495 MPa (71.8 ksi) for E80C-Ni2 PWHT — about 9% more. Tensile strength is 630 MPa (91.4 ksi) vs 590 MPa (85.6 ksi).
Which condition does FabDigit quote by default, M21 or PWHT?
AW is the default E80C-Ni2 condition in the FabDigit quote flow (neither M21 nor PWHT). 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.
When should I choose E80C-Ni2-M21 over E80C-Ni2 PWHT?
Pick E80C-Ni2-M21 when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in E80C-Ni2-M21 and E80C-Ni2 PWHT 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.