Stainless Steel 420V Annealed vs 420V H&T High Temper 55-57 HRC
Stainless Steel · 420V temper comparison
420V Annealed and 420V H&T High Temper 55-57 HRC are two conditions of the same stainless steel grade, 420V: Annealed versus H&T High Temper 55-57 HRC (hardened & High-Tempered). The chemistry is identical, so every difference below comes from the condition. 420V H&T High Temper 55-57 HRC is the stronger of the two: yield strength 1,750 MPa (254 ksi) against 600 MPa (87 ksi) for 420V Annealed, about 192% more; tensile strength follows at 1,950 MPa (283 ksi) vs 900 MPa (131 ksi). In exchange, 420V Annealed is the more ductile: elongation 8% versus 1.5% for 420V H&T High Temper 55-57 HRC, and 420V H&T High Temper 55-57 HRC is harder (595 HB vs 255 HB). 420V H&T High Temper 55-57 HRC runs hotter in service (450°C vs 400°C continuous) and 420V Annealed conducts electricity better (2.8 % IACS vs 2.5 % IACS). On the shop floor, 420V Annealed machines more easily (poor vs not recommended).
420V AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
420V H&T High Temper 55-57 HRCChoose it when strength drives the design, or when the part sees heat.
420V Annealed vs 420V H&T High Temper 55-57 HRC: 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.
420V Annealed420V H&T High Temper 55-57 HRC
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 160 GPa23.2 Msi · Poisson's Ratio 0.28 · Hardness, Rockwell B 100 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.39 g/cm³0.27 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °F · Liquidus Temperature 1,455°C2,651 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 20 W/m·K11.6 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 10.4 µm/m·K5.8 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -60°C-76 °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) -0.3 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 30 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 80 MJ/kg34,394 BTU/lb · Embodied Carbon (primary production) 6.5 kg CO₂/kg · Embodied Water 250 L/kg30 gal/lb · Typical Recycled Content 25%
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.
420V Annealed vs 420V H&T High Temper 55-57 HRC — frequently asked
Is 420V H&T High Temper 55-57 HRC stronger than 420V Annealed?
Yes. 420V H&T High Temper 55-57 HRC has a typical yield strength of 1,750 MPa (254 ksi) against 600 MPa (87 ksi) for 420V Annealed — about 192% more. Tensile strength is 1,950 MPa (283 ksi) vs 900 MPa (131 ksi).
Which condition does FabDigit quote by default, Annealed or H&T High Temper 55-57 HRC?
Annealed is the default 420V 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, 420V Annealed or 420V H&T High Temper 55-57 HRC?
420V Annealed. Its machinability rates poor (15/100) against not recommended (5/100) for 420V H&T High Temper 55-57 HRC; for welding the order is 420V Annealed first (not recommended, 12/100) then 420V H&T High Temper 55-57 HRC (not recommended, 5/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 420V Annealed and 420V H&T High Temper 55-57 HRC 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.