Steel S450J0 +N vs S450J0 +Z
Steel · S450J0 temper comparison
S450J0 +N and S450J0 +Z are two conditions of the same steel grade, S450J0: +N (normalized) versus +Z (hot-dip galvanized product). The chemistry is identical, so every difference below comes from the condition. Both yield at about 475 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (normalized versus hot-dip galvanized product). S450J0 +N runs hotter in service (380°C vs 200°C continuous). On the shop floor, S450J0 +N welds better (very good vs good) and S450J0 +N forms better (good vs fair).
S450J0 +NChoose it when the part sees heat, or when it will be welded.
S450J0 +N vs S450J0 +Z: 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)
Elongation at Break
Reduction in Area
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 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.3 · Yield Strength (0.2% offset) 475 MPa68.9 ksi · Compressive Strength 475 MPa68.9 ksi · Shear Strength 375 MPa54.4 ksi
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °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 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12 µm/m·K6.7 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature 0°C32 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 9.5 % IACS · Electrical Resistivity 1.8×10⁻⁷ Ω·m7.09 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 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 50 / 100 · Polishability 40 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 2 kg CO₂/kg · Embodied Water 40 L/kg4.8 gal/lb · Typical Recycled Content 30%
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.
S450J0 +N vs S450J0 +Z — frequently asked
What is the difference between S450J0 +N and S450J0 +Z?
S450J0 +N and S450J0 +Z are two conditions of the same steel grade, S450J0: +N (normalized) versus +Z (hot-dip galvanized product). The chemistry is identical, so every difference below comes from the condition. Both yield at about 475 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (normalized versus hot-dip galvanized product).
Which condition does FabDigit quote by default, +N or +Z?
+AR is the default S450J0 condition in the FabDigit quote flow (neither +N nor +Z). 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, S450J0 +N or S450J0 +Z?
S450J0 +N, by a small margin. Both rate fair for machinability — 47/100 against 42/100 for S450J0 +Z; for welding the order is S450J0 +N first (very good, 75/100) then S450J0 +Z (good, 55/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in S450J0 +N and S450J0 +Z 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.