Stainless Steel ER420-ANN vs ER420 PWHT-400
Stainless Steel · ER420 temper comparison
ER420-ANN and ER420 PWHT-400 are two conditions of the same stainless steel grade, ER420: ANN (annealed) versus PWHT-400 (PWHT 350–450 °C). The chemistry is identical, so every difference below comes from the condition. ER420 PWHT-400 is the stronger of the two: yield strength 1,250 MPa (181 ksi) against 450 MPa (65.3 ksi) for ER420-ANN, about 178% more; tensile strength follows at 1,500 MPa (218 ksi) vs 760 MPa (110 ksi). In exchange, ER420-ANN is the more ductile: elongation 18% versus 7% for ER420 PWHT-400, and ER420 PWHT-400 is harder (430 HB vs 215 HB). ER420-ANN runs hotter in service (600°C vs 350°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-400Choose it when strength drives the design.
ER420-ANN vs ER420 PWHT-400: 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
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 200 GPa29 Msi · Shear Modulus 78 GPa11.3 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.28
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.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: 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.
Electrical Conductivity
Electrical Resistivity
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 %)
Weldability
Formability (cold)
Same in both: 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-400 — frequently asked
Is ER420 PWHT-400 stronger than ER420-ANN?
Yes. ER420 PWHT-400 has a typical yield strength of 1,250 MPa (181 ksi) against 450 MPa (65.3 ksi) for ER420-ANN — about 178% more. Tensile strength is 1,500 MPa (218 ksi) vs 760 MPa (110 ksi).
Which condition does FabDigit quote by default, ANN or PWHT-400?
AW is the default ER420 condition in the FabDigit quote flow (neither ANN nor PWHT-400). 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-400?
ER420-ANN. Its machinability rates fair (42/100) against poor (18/100) for ER420 PWHT-400.
Ready to make it?
Upload a CAD file and FabDigit prices the part in ER420-ANN and ER420 PWHT-400 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.