Steel A607 Grade 50 vs A607 Grade 70
Steel · grade comparison
Steel A607 Grade 50 and A607 Grade 70 are both steel grades. A607 Grade 70 is the stronger of the two: yield strength 515 MPa (74.7 ksi) against 380 MPa (55.1 ksi) for A607 Grade 50, about 36% more; tensile strength follows at 620 MPa (89.9 ksi) vs 490 MPa (71.1 ksi). In exchange, A607 Grade 50 is the more ductile: elongation 26% versus 16% for A607 Grade 70, and A607 Grade 70 is harder (185 HB vs 150 HB). A607 Grade 50 runs hotter in service (400°C vs 350°C continuous). On the shop floor, A607 Grade 50 welds better (82 vs 72 out of 100).
A607 Grade 50Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
A607 Grade 70Choose it when strength drives the design.
A607 Grade 50 vs A607 Grade 70: 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)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
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: Elastic (Young's) Modulus 205 GPa29.7 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Melting Point (Solidus)
Liquidus Temperature
Same in both: Density 7.85 g/cm³0.28 lb/in³
Thermal
How each material carries heat and how hot it can run.
Specific Heat Capacity
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 45 W/m·K26 BTU/hr·ft·°F · Thermal Expansion (CTE, 20–100 °C) 12 µm/m·K6.7 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -30°C-22 °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)
Brazeability / Solderability
Same in both: Polishability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Water
Typical Recycled Content
Same in both: Embodied Carbon (primary production) 2.1 kg CO₂/kg
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
Same in both: Specific Stiffness (E / density) 26.1 MN·m/kg
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 | A607 Grade 50 | A607 Grade 70 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $ Budget | $ Budget |
| 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.
A607 Grade 50 vs A607 Grade 70 — frequently asked
Is A607 Grade 70 stronger than A607 Grade 50?
Yes. A607 Grade 70 has a typical yield strength of 515 MPa (74.7 ksi) against 380 MPa (55.1 ksi) for A607 Grade 50 — about 36% more. Tensile strength is 620 MPa (89.9 ksi) vs 490 MPa (71.1 ksi).
Which is cheaper, A607 Grade 50 or A607 Grade 70?
Both sit in the same relative cost tier ($, budget); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, A607 Grade 50 or A607 Grade 70?
A607 Grade 50. Its machinability rates good (55/100) against fair (48/100) for A607 Grade 70; for welding the order is A607 Grade 50 first (very good, 82/100) then A607 Grade 70 (very good, 72/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in A607 Grade 50 and A607 Grade 70 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.