Steel Density by Grade Chart: Carbon, Stainless, and Alloy Steel

Not all steel weighs the same. While structural mild steel has a standard density of 7,850 kg/m³, other alloys contain elements like chromium, nickel, or molybdenum that alter their density and weight.

Common Steel Alloys and Densities

Understanding the density of the specific grade you are using is key for accurate weight estimation. Here are standard densities for common steel grades:

• Mild Carbon Steel (e.g., A36): (7,850 \text{ kg/m}^3) (0.284 lb/in³)
• Stainless Steel 304: (7,930 \text{ kg/m}^3) (0.286 lb/in³)
• Stainless Steel 316: (8,000 \text{ kg/m}^3) (0.289 lb/in³)
• Tool Steel (e.g., D2): (7,810 \text{ kg/m}^3) (0.282 lb/in³)
• High-Strength Alloy Steel (e.g., 4140): (7,850 \text{ kg/m}^3) (0.284 lb/in³)

Use our length to weight steel calculator to input custom densities for specific alloy projects. For concrete reinforcing projects, refer to our rebar weight calculation formulas.