| 摘要 |
<p>PURPOSE:To reduce the cost of iron power for a body warmer to a greater extent by using a powder mixture composed of pig iron and atomized iron powder essentially consisting of the fine powder of the pig iron as said iron powder. CONSTITUTION:The mixture composed of 60-90wt.% powder contg. >=90% pig iron pulverized to -100 mesh and 10-40wt.% atomized iron powder of -35 mesh-+60 mesh is used as the iron powder for the body warmer. If F pig iron is used as the pig iron, 60-80wt.% said powder and 20-40wt.% atomized iron powder are mixed; if the powder of B pig iron is used, 70-90wt.% said powder and 10-30wt.% free cutting steel powder prepd. by pulverizing the powder by water atomization, then subjecting the same to a reducing treatment are mixed. Since the inexpensive pig iron is used and is mechanically pulverized, there is no surface oxidation and the use of the pig iron powder having the surface of a large specific surface area and large activity in a large amt. is usable and the cost of the iron powder for the body warmer is reduced to a greater extent.</p> |
