Look at what it becomes after sintering, and the answer stops being about mesh numbers. A 300 mesh iron powder runs about 48 microns on average, an order of magnitude finer than conventional reduced iron powder, and the particle surfaces are soft-agglomerated — so it fills a die evenly, presses into a solid green part and diffuses quickly in the furnace. The bond comes out denser, harder and better at holding the diamond. That is the real basis for taking over part of its copper and cobalt.
Retention. A harder bond wears more slowly, so diamond grains are not lost before they are dull. Protrusion stays consistent, the bond wears at a rate that matches diamond consumption, and the segment stops skating.
Sharpness against life. The usual trade-off is settled in the furnace. Phosphorus-diffused iron sinters to good density around 850 °C, giving enough transverse strength that edges do not chip. Iron is also brittle and self-sharpening, so on concrete and stone it keeps opening fresh cutting edges — the tool feels aggressive in the hand.
Cost. Copper and cobalt swing hard on price. Swapping a share of them for iron drops formula cost immediately, and hardness and bending strength do not have to be sacrificed. Sagwell's SE-02 follows the same route.
Core-drill teeth are the classic case: continuous drilling through reinforced concrete demands wear resistance without loading up, and the higher the iron share, the lower the cost per tooth.
Wall-chasing blades and stone saw blades care about sharpness and stability. More iron keeps the cut straight and keeps the teeth on the segment.
Road blades and asphalt segments face highly abrasive concrete. The bond has to be hard and wear-resistant, yet must not grip the diamond so tightly that it dulls in place — iron with phosphorus lands right on that point.
General-purpose hardware blades run the other way: load iron heavily, cut back on copper and tin, and the blade cuts lighter without giving up life.
So when you pick a 300 mesh iron powder, do not start with the particle size chart. Start with what you cut, how you press it and how hot you sinter, then check whether forming behaviour and sintering activity line up. The grade that lines up is the right one.
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