Stainless Steel ER420-ANN vs ER420 PWHT-650
Stainless Steel · ER420 temper comparison
ER420-ANN and ER420 PWHT-650 are two conditions of the same stainless steel grade, ER420: ANN (annealed) versus PWHT-650 (PWHT 600–700 °C). The chemistry is identical, so every difference below comes from the condition. ER420 PWHT-650 is the stronger of the two: yield strength 850 MPa (123 ksi) against 450 MPa (65.3 ksi) for ER420-ANN, about 89% more; tensile strength follows at 1,050 MPa (152 ksi) vs 760 MPa (110 ksi). In exchange, ER420-ANN is the more ductile: elongation 18% versus 13% for ER420 PWHT-650, and ER420 PWHT-650 is harder (310 HB vs 215 HB). ER420-ANN runs hotter in service (600°C vs 550°C continuous). On the shop floor, ER420-ANN machines more easily (fair vs poor).
ER420-ANNChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
ER420 PWHT-650Choose it when strength drives the design.
ER420-ANN vs ER420 PWHT-650: 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
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
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 · Compressive Strength 1,700 MPa247 ksi · Shear Strength 990 MPa144 ksi · Fatigue Strength (Endurance Limit) 550 MPa79.8 ksi · Fracture Toughness (K_IC) 20 MPa·√m18.2 ksi·√in · Hardness, Vickers 540 HV
Physical
Density and transition temperatures.
Same in both: Density 7.7 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.
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 260 J/g112 BTU/lb · Min Service Temperature -20°C-4 °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) -0.25 V
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 35 / 100 · Brazeability / Solderability 45 / 100 · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 53 MJ/kg22,786 BTU/lb · Embodied Carbon (primary production) 4.6 kg CO₂/kg · Embodied Water 180 L/kg21.6 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.
ER420-ANN vs ER420 PWHT-650 — frequently asked
Is ER420 PWHT-650 stronger than ER420-ANN?
Yes. ER420 PWHT-650 has a typical yield strength of 850 MPa (123 ksi) against 450 MPa (65.3 ksi) for ER420-ANN — about 89% more. Tensile strength is 1,050 MPa (152 ksi) vs 760 MPa (110 ksi).
Which condition does FabDigit quote by default, ANN or PWHT-650?
AW is the default ER420 condition in the FabDigit quote flow (neither ANN nor PWHT-650). 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, ER420-ANN or ER420 PWHT-650?
ER420-ANN. Its machinability rates fair (42/100) against poor (32/100) for ER420 PWHT-650.
Ready to make it?
Upload a CAD file and FabDigit prices the part in ER420-ANN and ER420 PWHT-650 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.