was not commercially available until the 1960s.Manufacturers of saw blades are researching areas featuring powder metallurgy, high speed steels, laser welded strip, shot peening (to improve fatigue resistance), and saw blades with exotic metal* coatings.
The type of saw blade is determined by the type of material being cut. Generally, the harder the material, the more teeth per inch of saw blade needed. For example a good blade to use while cutting aluminum is one with 4-6 teeth per inch. Mild steel is cut with a saw blade having anywhere from 18-24 teeth per inch of blade.
Very high temperatures are produced at the very tips of cutting tools. Loss of hardness at high temperatures is the main reason for the saw blade wearing out or breaking. Advances in metal*
cutting tools throughout this century have addressed this problem. From plain carbon steels (hard but no heat or abrasion resistance), to high speed steels (hard & heat-resistant to around 600 degrees C), powder coated high speed steels (more resistant to wear and abrasion), and tungsten carbide (very hard/heat-resistant to around 800 degrees C (very abrasion resistant). Some manufacturers in specialized industries have ceramic and gemstone cutting tools.