Steel 30Q140 vs 35W250
Steel · grade comparison
Steel 30Q140 and 35W250 are both steel grades. 35W250 is the stronger of the two: yield strength 360 MPa (52.2 ksi) against 310 MPa (45 ksi) for 30Q140, about 16% more; tensile strength follows at 480 MPa (69.6 ksi) vs 350 MPa (50.8 ksi). 35W250 is stiffer (195 GPa vs 120 GPa) and 35W250 runs hotter in service (180°C vs 150°C continuous). On the shop floor, 35W250 machines more easily (45 vs 35 out of 100) and 35W250 forms better (fair vs poor).
35W250Choose it when strength drives the design, or when the part sees heat.
30Q140 vs 35W250: 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
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Vickers
Shear Modulus
Bulk Modulus
Compressive Strength
Charpy V-Notch Impact (RT)
Hardness, Rockwell B
Same in both: Elongation at Break 12%
Physical
Density and transition temperatures.
Melting Point (Solidus)
Liquidus Temperature
Same in both: Density 7.65 g/cm³0.28 lb/in³
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Min Service Temperature -60°C-76 °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 40 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 15%
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 | 30Q140 | 35W250 |
|---|---|---|
| Sheet metal | — | Yes |
| Default condition | — | Final Annealed |
| Relative cost | $$ Standard | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
| Black Oxide | — | Yes |
| Cerakote | — | Yes |
| Chrome Plating | — | Yes |
| E-Coating | — | Yes |
| Hot-Dip Galvanizing | — | Yes |
| Nickel Plating | — | Yes |
| PTFE Coating | — | Yes |
| Painting | — | Yes |
| Powder Coating | — | Yes |
| Tin Plating | — | Yes |
| Zinc Plating | — | Yes |
| Zinc-Flake (Dip-Spin) Coating | — | Yes |
| Zinc-Nickel Plating | — | Yes |
They share 9 finishes: Copper Plating, Electroless Nickel (EN), Epoxy Coating, Gold Plating, Hard Chrome Plating, Manganese Phosphate, Plasma Spray, Silver Plating, Zinc Phosphate.
30Q140 vs 35W250 — frequently asked
Is 35W250 stronger than 30Q140?
Yes. 35W250 has a typical yield strength of 360 MPa (52.2 ksi) against 310 MPa (45 ksi) for 30Q140 — about 16% more. Tensile strength is 480 MPa (69.6 ksi) vs 350 MPa (50.8 ksi).
Which is cheaper, 30Q140 or 35W250?
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, 30Q140 or 35W250?
35W250, by a small margin. Both rate fair for machinability — 45/100 against 35/100 for 30Q140; for welding the order is 35W250 first (fair, 35/100) then 30Q140 (poor, 30/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 30Q140 and 35W250 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.