Steel A335 P11 vs A335 P91
Steel · grade comparison
Steel A335 P11 and A335 P91 are both steel grades, both heat resistant steel. A335 P91 is the stronger of the two: yield strength 700 MPa (102 ksi) against 340 MPa (49.3 ksi) for A335 P11, about 106% more; tensile strength follows at 950 MPa (138 ksi) vs 520 MPa (75.4 ksi). In exchange, A335 P11 is the more ductile: elongation 26% versus 14% for A335 P91, and A335 P91 is harder (300 HB vs 170 HB). A335 P91 is stiffer (218 GPa vs 205 GPa) and A335 P11 runs hotter in service (480°C vs 200°C continuous). On the shop floor, A335 P11 machines more easily (fair vs poor) and A335 P11 welds better (good vs poor).
A335 P11Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
A335 P91Choose it when strength drives the design.
A335 P11 vs A335 P91: 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
Bulk Modulus
Poisson's Ratio
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
Hardness, Rockwell C
Physical
Density and transition temperatures.
Density
Liquidus Temperature
Same in both: Melting Point (Solidus) 1,450°C2,642 °F
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)
Same in both: 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
Polishability
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
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 | A335 P11 | A335 P91 |
|---|---|---|
| Default condition | HR | HR |
| Relative cost | $$ Standard | $$ Standard |
| Min. machined wall | 0.8 mm | 0.8 mm |
| Best machined surface | Ra 1.6 µm | Ra 1.6 µm |
Both are offered for CNC machining and Sheet metal. Both take the same 38 finishes: AlCrN, AlTiN, Black Oxide, CVD Al2O3, CVD TiCN, CVD TiN, Cerakote, Chrome Plating, Copper Plating, CrN, DLC, E-Coating and 26 more.
A335 P11 vs A335 P91 — frequently asked
Is A335 P91 stronger than A335 P11?
Yes. A335 P91 has a typical yield strength of 700 MPa (102 ksi) against 340 MPa (49.3 ksi) for A335 P11 — about 106% more. Tensile strength is 950 MPa (138 ksi) vs 520 MPa (75.4 ksi).
Which is cheaper, A335 P11 or A335 P91?
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, A335 P11 or A335 P91?
A335 P11. Its machinability rates fair (50/100) against poor (25/100) for A335 P91; for welding the order is A335 P11 first (good, 60/100) then A335 P91 (poor, 20/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in A335 P11 and A335 P91 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.