Steel 35# vs ZG55SiMnMo
Steel · grade comparison
Steel 35# and ZG55SiMnMo are both steel grades. ZG55SiMnMo is the stronger of the two: yield strength 1,300 MPa (189 ksi) against 330 MPa (47.9 ksi) for 35#, about 3.9 times as much; tensile strength follows at 1,600 MPa (232 ksi) vs 560 MPa (81.2 ksi). In exchange, 35# is the more ductile: elongation 22% versus 5% for ZG55SiMnMo, and ZG55SiMnMo is harder (460 HB vs 160 HB). 35# runs hotter in service (400°C vs 350°C continuous) and 35# conducts heat better (49 W/m·K vs 38 W/m·K). On the shop floor, 35# machines more easily (good vs poor), 35# welds better (good vs poor), and 35# sits in a lower cost tier (budget, $) than ZG55SiMnMo (standard, $$).
35#Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
ZG55SiMnMoChoose it when strength drives the design.
35# vs ZG55SiMnMo: 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
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
Compressive Strength
Hardness, Rockwell C
Same in both: Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Liquidus Temperature
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Latent Heat of Fusion 250 J/g107 BTU/lb
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
Same in both: Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Typical Recycled Content
Same in both: Embodied Water 40 L/kg4.8 gal/lb
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 | 35# | ZG55SiMnMo |
|---|---|---|
| CNC machining | Yes | — |
| Sheet metal | Yes | — |
| Default condition | HR | — |
| Relative cost | $ Budget | $$ Standard |
| Min. machined wall | 0.8 mm | — |
| Best machined surface | Ra 1.6 µm | — |
| AlCrN | Yes | — |
| AlTiN | Yes | — |
| Black Oxide | Yes | — |
| CVD Al2O3 | Yes | — |
| CVD TiCN | Yes | — |
| CVD TiN | Yes | — |
| Cerakote | Yes | — |
| Chrome Plating | Yes | — |
| CrN | Yes | — |
| DLC | Yes | — |
| E-Coating | Yes | — |
| HVOF Coating | Yes | — |
| Hot-Dip Galvanizing | Yes | — |
| MoS2 | Yes | — |
| Multilayer CVD | Yes | — |
| Nickel Plating | Yes | — |
| PTFE Coating | Yes | — |
| Painting | 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.
35# vs ZG55SiMnMo — frequently asked
Is ZG55SiMnMo stronger than 35#?
Yes. ZG55SiMnMo has a typical yield strength of 1,300 MPa (189 ksi) against 330 MPa (47.9 ksi) for 35# — about 3.9 times as much. Tensile strength is 1,600 MPa (232 ksi) vs 560 MPa (81.2 ksi).
Which is cheaper, 35# or ZG55SiMnMo?
35# is the lower-cost material: it sits in the budget tier ($) while ZG55SiMnMo is standard ($$). 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, 35# or ZG55SiMnMo?
35#. Its machinability rates good (60/100) against poor (15/100) for ZG55SiMnMo; for welding the order is 35# first (good, 55/100) then ZG55SiMnMo (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 35# and ZG55SiMnMo 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.