Steel 6CrW2Si vs S4
Steel · grade comparison
Steel 6CrW2Si and S4 are both steel grades. 6CrW2Si is the stronger of the two: tensile strength 760 MPa (110 ksi) against 720 MPa (104 ksi) for S4, about 6% more. In exchange, S4 is the more ductile: elongation 25% versus 18% for 6CrW2Si, and 6CrW2Si is harder (240 HB vs 210 HB). 6CrW2Si conducts heat better (33 W/m·K vs 25 W/m·K). On the shop floor, S4 machines more easily (48 vs 35 out of 100) and 6CrW2Si sits in a lower cost tier (standard, $$) than S4 (premium, $$$).
6CrW2SiChoose it when strength drives the design, or when cost is the deciding factor.
S4Choose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
6CrW2Si vs S4: 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.
Bulk Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 207 GPa30 Msi · Shear Modulus 80 GPa11.6 Msi · Poisson's Ratio 0.29 · Charpy V-Notch Impact (RT) 60 J44.3 ft·lbf
Physical
Density and transition temperatures.
Density
Same in both: Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,480°C2,696 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Same in both: Thermal Expansion (CTE, 20–100 °C) 12.4 µm/m·K6.9 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Electrical Conductivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Same in both: Corrosion Resistance 12 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Castability
Same in both: Brazeability / Solderability 45 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 35%
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 | 6CrW2Si | S4 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$ Standard | $$$ Premium |
| 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.
6CrW2Si vs S4 — frequently asked
Is 6CrW2Si stronger than S4?
Yes. 6CrW2Si has a typical tensile strength of 760 MPa (110 ksi) against 720 MPa (104 ksi) for S4 — about 6% more.
Which is cheaper, 6CrW2Si or S4?
6CrW2Si is the lower-cost material: it sits in the standard tier ($$) while S4 is premium ($$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, 6CrW2Si or S4?
S4, by a small margin. Both rate fair for machinability — 48/100 against 35/100 for 6CrW2Si.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 6CrW2Si and S4 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.