1. Keyword Explanation
White Corundum (Aluminum Oxide)
Composition: A synthetic abrasive made from fused high-purity aluminum oxide. It is distinct from brown corundum due to its higher purity. Key Properties: High Hardness (9.0 on the Mohs scale): Second only to diamond and silicon carbide, providing excellent cutting ability. High Purity & Sharpness: Results in clean, low-contamination blasting, which is critical for welding integrity. Good Toughness: Resists fracturing upon impact, allowing for potential reuse with a recycling system. Chemically Inert: Does not react with the steel surface.
Grit Size: 30# and 36#
30#: A coarser grit. It removes heavy rust and thick mill scale very quickly and creates a deeper surface profile (anchor pattern). 36#: A medium-coarse grit. This is arguably the most common and balanced choice for rail blasting. It offers a great balance between fast cleaning speed, controlled surface profile, and efficient media usage.
Sandblasting (Abrasive Blasting)
Clean: Remove all rust, old paint, oil, and mill scale. Profile (Anchor Pattern): Create a microscopically rough surface that dramatically increases the adhesion of coatings or the quality of welds. Peen: Impart beneficial compressive stresses on the surface.