ASTM Grade HP Steel vs. AISI 304N Stainless Steel
Both ASTM grade HP steel and AISI 304N stainless steel are iron alloys. They have 66% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is ASTM grade HP steel and the bottom bar is AISI 304N stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 140 | |
| 190 to 360 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 5.1 | |
| 9.1 to 45 |
| Fatigue Strength, MPa | 130 | |
| 220 to 440 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 78 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 490 | |
| 620 to 1180 |
| Tensile Strength: Yield (Proof), MPa | 260 | |
| 270 to 850 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 290 |
| Maximum Temperature: Corrosion, °C | 440 | |
| 420 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 960 |
| Melting Completion (Liquidus), °C | 1370 | |
| 1420 |
| Melting Onset (Solidus), °C | 1330 | |
| 1380 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 12 | |
| 16 |
| Thermal Expansion, µm/m-K | 16 | |
| 16 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 34 | |
| 15 |
| Density, g/cm3 | 7.9 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 5.8 | |
| 3.0 |
| Embodied Energy, MJ/kg | 82 | |
| 43 |
| Embodied Water, L/kg | 220 | |
| 150 |
Common Calculations
| PREN (Pitting Resistance) | 27 | |
| 21 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 21 | |
| 98 to 280 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 170 | |
| 180 to 1830 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 17 | |
| 22 to 42 |
| Strength to Weight: Bending, points | 17 | |
| 21 to 32 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 4.2 |
| Thermal Shock Resistance, points | 11 | |
| 14 to 26 |
Alloy Composition
| Carbon (C), % | 0.35 to 0.75 | |
| 0 to 0.080 |
| Chromium (Cr), % | 24 to 28 | |
| 18 to 20 |
| Iron (Fe), % | 29.2 to 42.7 | |
| 66.4 to 73.9 |
| Manganese (Mn), % | 0 to 2.0 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 0 to 0.5 | |
| 0 |
| Nickel (Ni), % | 33 to 37 | |
| 8.0 to 10.5 |
| Nitrogen (N), % | 0 | |
| 0.1 to 0.16 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 2.5 | |
| 0 to 0.75 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.030 |