Steel A436 Type 1 vs A439 Type D-2
Steel · grade comparison
Steel A436 Type 1 and A439 Type D-2 are both steel grades. A439 Type D-2 is the stronger of the two: yield strength 250 MPa (36.3 ksi) against 130 MPa (18.9 ksi) for A436 Type 1, about 92% more; tensile strength follows at 450 MPa (65.3 ksi) vs 190 MPa (27.6 ksi). A439 Type D-2 is the more ductile: elongation 12% versus 2% for A436 Type 1, and A439 Type D-2 is harder (170 HB vs 150 HB). A439 Type D-2 is stiffer (120 GPa vs 100 GPa) and A436 Type 1 conducts heat better (39 W/m·K vs 12.6 W/m·K). On the shop floor, A439 Type D-2 welds better (fair vs poor) and A436 Type 1 sits in a lower cost tier (premium, $$$) than A439 Type D-2 (high, $$$$).
A436 Type 1Choose it when cost is the deciding factor.
A439 Type D-2Choose it when strength drives the design, or when the part is bent, formed or impact-loaded.
A436 Type 1 vs A439 Type D-2: 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
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Bulk Modulus
Physical
Density and transition temperatures.
Density
Same in both: Melting Point (Solidus) 1,150°C2,102 °F · Liquidus Temperature 1,230°C2,246 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 18.7 µm/m·K10.4 µin/in·°F · Latent Heat of Fusion 220 J/g94.6 BTU/lb · Max Service Temperature (continuous) 760°C1,400 °F · Min Service Temperature -100°C-148 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Same in both: Electrical Conductivity 1.7 % IACS
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
Polishability
Sustainability
Primary-production footprint per kilogram.
Embodied Carbon (primary production)
Embodied Water
Same in both: Embodied Energy (primary production) 45 MJ/kg19,347 BTU/lb · Typical Recycled Content 60%
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 | A436 Type 1 | A439 Type D-2 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$ Premium | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 9 finishes: Copper Plating, Electroless Nickel (EN), Epoxy Coating, Gold Plating, Hard Chrome Plating, Manganese Phosphate, Plasma Spray, Silver Plating, Zinc Phosphate.
A436 Type 1 vs A439 Type D-2 — frequently asked
Is A439 Type D-2 stronger than A436 Type 1?
Yes. A439 Type D-2 has a typical yield strength of 250 MPa (36.3 ksi) against 130 MPa (18.9 ksi) for A436 Type 1 — about 92% more. Tensile strength is 450 MPa (65.3 ksi) vs 190 MPa (27.6 ksi).
Which is cheaper, A436 Type 1 or A439 Type D-2?
A436 Type 1 is the lower-cost material: it sits in the premium tier ($$$) while A439 Type D-2 is high ($$$$). 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, A436 Type 1 or A439 Type D-2?
A436 Type 1, by a small margin. Both rate fair for machinability — 52/100 against 45/100 for A439 Type D-2; for welding the order is A439 Type D-2 first (fair, 50/100) then A436 Type 1 (poor, 30/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in A436 Type 1 and A439 Type D-2 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.