Steel ZG270-500 vs ZG340-640
Steel · grade comparison
Steel ZG270-500 and ZG340-640 are both steel grades. ZG340-640 is the stronger of the two: yield strength 360 MPa (52.2 ksi) against 300 MPa (43.5 ksi) for ZG270-500, about 20% more; tensile strength follows at 660 MPa (95.7 ksi) vs 540 MPa (78.3 ksi). In exchange, ZG270-500 is the more ductile: elongation 22% versus 11% for ZG340-640, and ZG340-640 is harder (210 HB vs 160 HB). ZG270-500 conducts electricity better (10 % IACS vs 8.6 % IACS). On the shop floor, ZG270-500 welds better (very good vs fair).
ZG270-500Choose it when the part is bent, formed or impact-loaded, or when it will be welded.
ZG340-640Choose it when strength drives the design.
ZG270-500 vs ZG340-640: 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.
Elastic (Young's) Modulus
Shear Modulus
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 B
Hardness, Vickers
Same in both: Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Density
Liquidus Temperature
Same in both: Melting Point (Solidus) 1,425°C2,597 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Latent Heat of Fusion
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.2 µm/m·K6.8 µin/in·°F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Castability
Brazeability / Solderability
Polishability
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Water
Typical Recycled Content
Same in both: Embodied Carbon (primary production) 2 kg CO₂/kg
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
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.
Manufacturing and finishing
| Capability | ZG270-500 | ZG340-640 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$ Standard | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 9 finishes: Copper Plating, Electroless Nickel (EN), Epoxy Coating, Gold Plating, Hard Chrome Plating, Manganese Phosphate, Plasma Spray, Silver Plating, Zinc Phosphate.
ZG270-500 vs ZG340-640 — frequently asked
Is ZG340-640 stronger than ZG270-500?
Yes. ZG340-640 has a typical yield strength of 360 MPa (52.2 ksi) against 300 MPa (43.5 ksi) for ZG270-500 — about 20% more. Tensile strength is 660 MPa (95.7 ksi) vs 540 MPa (78.3 ksi).
Which is cheaper, ZG270-500 or ZG340-640?
Both sit in the same relative cost tier ($$, standard); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, ZG270-500 or ZG340-640?
ZG270-500. Its machinability rates good (58/100) against fair (50/100) for ZG340-640; for welding the order is ZG270-500 first (very good, 72/100) then ZG340-640 (fair, 35/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in ZG270-500 and ZG340-640 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.