Basic study of high-Copper containing steel scrap recycle using P/M process

Taku Iwaoka, Akira Fujiki

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The disused car scrap with the copper wire etc. is crushed together, and dissolved in an electric furnace. The removal of copper from the steel scrap that is thus inevitably contained high copper is difficult. Because the copper causes surface hot-shortness during hot rolling of steel, it is usually considered as a harmful tramp element. In powder metallurgy, the processing of recycling copper rich scrap was studied. Although the obtained materials showed high strength, this processing is not cost-effective for high-volume production. Therefore, we focused on the conventional compacting-sintering in order to recycle high-copper steel scrap efficiently. The mixture of gas-atomized Fe-4mass%Cu powder, pure iron powder and graphite was compacted with the die wall lubricating method. The obtained green compacts were sintered at 1423 K for 1.8 ks in an argon atmosphere. The transverse rupture strength and sintered density were 50OMPa and 7.0 Mg/m 3 respectively though the pearlite was hardly observed compared with standard Fe-Cu-C type sintered materials. Thus there is still room for improvement in strength property of the alloyed powder mixture obtained from the conventional process. In conclusion, the possibility of high-copper scrap recycling using conventional powder metallurgy was found.

Original languageEnglish
Pages (from-to)633-639
Number of pages7
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume58
Issue number10
DOIs
Publication statusPublished - 2011 Oct

Fingerprint

Steel scrap
Copper
Powder metallurgy
Recycling
Copper scrap
Powders
Electric furnaces
Iron powder
Graphite
Pearlite
Argon
Hot rolling
Steel
Processing
Railroad cars
Sintering
Gases
Wire

Keywords

  • Fe-cu alloyed powder
  • High-copper steel scrap
  • Recycle

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

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abstract = "The disused car scrap with the copper wire etc. is crushed together, and dissolved in an electric furnace. The removal of copper from the steel scrap that is thus inevitably contained high copper is difficult. Because the copper causes surface hot-shortness during hot rolling of steel, it is usually considered as a harmful tramp element. In powder metallurgy, the processing of recycling copper rich scrap was studied. Although the obtained materials showed high strength, this processing is not cost-effective for high-volume production. Therefore, we focused on the conventional compacting-sintering in order to recycle high-copper steel scrap efficiently. The mixture of gas-atomized Fe-4mass{\%}Cu powder, pure iron powder and graphite was compacted with the die wall lubricating method. The obtained green compacts were sintered at 1423 K for 1.8 ks in an argon atmosphere. The transverse rupture strength and sintered density were 50OMPa and 7.0 Mg/m 3 respectively though the pearlite was hardly observed compared with standard Fe-Cu-C type sintered materials. Thus there is still room for improvement in strength property of the alloyed powder mixture obtained from the conventional process. In conclusion, the possibility of high-copper scrap recycling using conventional powder metallurgy was found.",
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