Research and Development > JFE TECHNICAL REPORT > No.16 Special Issue on “Engineering,” “Steel Section Products,” and “Iron and Steel Powders” > Ni-Free Alloyed Steel Powder “FM Series“
for High Strength Sintered Compacts
with Excellent Machinability
No.16 Special Issue on “Engineering,” “Steel Section Products,” and “Iron and Steel Powders”
Ni-Free Alloyed Steel Powder “FM Series“ for High Strength Sintered Compacts with Excellent Machinability
UNAMI Shigeru OZAKI Yukiko ONO Tomoshige
Abstract
Ni-free alloyed steel powder “FM Series“ for high strength sintered compacts with excellent machinability has been developed. FM Series are pre-mixed powder based on a low Mo prealloyed (0.45 mass%) steel powder added with copper, graphite and lubricant for high density compaction. The sintered compacts of FM series provide tensile strength of 600 MPa with mesh-belt sintered condition and tensile strength of 1 000 MPa with mesh-belt sintered and carburized condition, which are equivalent to those of the conventional 4 mass% Ni diffusion-alloyed steel powder. The sintered compacts of FM series provide less than one fifth the tool wear of that of the conventional 4 mass% Ni diffusion-alloyed steel powder. The high strength and excellent machinability are caused by microstructure homogenization of the sintered compacts due to low Mo prealloyed steel powder.
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