When making steel, it reacts with sulfur and helps to increase the metal's resistance to heat. Atomic number 25, atomic weight 54.9380. Phosphorus (P): Phosphorus is a poisonous, nonmetallic ...
good electrical and thermal conductivity but poor resistance to corrosion Manhole covers, pans and gates, vices High-carbon steel (tool steel) Hard but brittle, less malleable than mild steel ...