Steel DX51D-HR vs DX51D S250GD
Steel · DX51D temper comparison
DX51D-HR and DX51D S250GD are two conditions of the same steel grade, DX51D: HR (hot rolled) versus S250GD (S250GD+Z). The chemistry is identical, so every difference below comes from the condition. DX51D S250GD is the stronger of the two: yield strength 290 MPa (42.1 ksi) against 240 MPa (34.8 ksi) for DX51D-HR, about 21% more; tensile strength follows at 360 MPa (52.2 ksi) vs 340 MPa (49.3 ksi). In exchange, DX51D-HR is the more ductile: elongation 32% versus 22% for DX51D S250GD, and DX51D S250GD is harder (120 HB vs 110 HB). DX51D-HR runs hotter in service (400°C vs 200°C continuous). On the shop floor, DX51D-HR welds better (excellent vs very good).
DX51D-HRChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
DX51D S250GDChoose it when strength drives the design.
DX51D-HR vs DX51D S250GD: 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.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 205 GPa29.7 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.3 · Fracture Toughness (K_IC) 130 MPa·√m118 ksi·√in · Charpy V-Notch Impact (RT) 75 J55.3 ft·lbf
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,495°C2,723 °F · Liquidus Temperature 1,525°C2,777 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12 µm/m·K6.7 µin/in·°F · 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).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.62 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Brazeability / Solderability 70 / 100 · Polishability 35 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 26 MJ/kg11,178 BTU/lb · Embodied Carbon (primary production) 2.5 kg CO₂/kg · Embodied Water 45 L/kg5.4 gal/lb · Typical Recycled Content 25%
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.
DX51D-HR vs DX51D S250GD — frequently asked
Is DX51D S250GD stronger than DX51D-HR?
Yes. DX51D S250GD has a typical yield strength of 290 MPa (42.1 ksi) against 240 MPa (34.8 ksi) for DX51D-HR — about 21% more. Tensile strength is 360 MPa (52.2 ksi) vs 340 MPa (49.3 ksi).
Which condition does FabDigit quote by default, HR or S250GD?
HR is the default DX51D condition in the FabDigit quote flow. The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, DX51D-HR or DX51D S250GD?
DX51D-HR, by a small margin. Both rate good for machinability — 65/100 against 60/100 for DX51D S250GD; for welding the order is DX51D-HR first (excellent, 92/100) then DX51D S250GD (very good, 70/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in DX51D-HR and DX51D S250GD 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.