| 摘要 |
PCT No. PCT/JP94/00578 Sec. 371 Date Oct. 31, 1995 Sec. 102(e) Date Oct. 31, 1995 PCT Filed Apr. 6, 1994 PCT Pub. No. WO94/28187 PCT Pub. Date Dec. 8, 1994This invention relates to high-carbon steel wire rod and wire excellent in drawability and methods of producing the same. The high carbon steel wire rod or wire excellent in is characterized in that it contains, in weight percent, C: 0.80-0.90%, Si: 0.10-1.50% and Mn: 0.10-1.00, is limited to P: not more than 0.02%, S: not more than 0.01% and Al: not more than 0.003%, the remainder being Fe and unavoidable impurities, and has a microstructure of, in terms of area ratio, not less than 80% upper bainite texture obtained by two-stepped transformation and an Hv of not more than 450. The high-carbon steel wire rod or wire may additionally contain Cr: 0.10-1.00% as an alloying component. The high-carbon steel wire rod or wire according to this invention can be drawn to an appreciably higher reduction of area than prior art products and also has improved delamination resistance property. The invention also enables production of high-carbon steel wire rod or wire excellent in ductility, elimination of intermediate heat treatment in the secondary processing step, a large reduction in cost, a shortening of production period, and a reduction of equipment expenses.
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