High-carbon steel wire rod with superior drawability and method for production thereof
AssigneeKabushiki Kaisha Kobe Seiko Sho
InventorsHideo Hata, Mamoru Nagao, Takaaki Minamida
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Abstract
A high-carbon steel wire rod with superior drawability which has the chemical composition (in mass %) of C: 0.6-1.0%, Si: 0.1-1.5%, Mn: 0.3-0.9%, P: no more than 0.02%, S no more than 0.03%, N: no more than 0.005%, (optional Nb: 0.020-0.050% and V: 0.05-0.20%), with the remainder being Fe and inevitable impurities, and the structure which is characterized in that pearlite accounts for no less than 95 area % and pearlite has an average nodule diameter (P μm) no larger than 30 μm and an average lamella space (S nm) no smaller than 100 nm such that the value of F calculated by the formula below is larger than zero F=350.3/{overscore (S)}+130.3/{overscore (P)}−51.7.
Claims8
A high-carbon steel wire rod with superior drawability which has the chemical composition (in mass %) defined below:
- C:
- 0.6-1.0%
- Si :
- 0.1-1.5%
- Mn :
- 0.3-0.9%
- P :
- no more than 0.02%
- S :
- no more than 0.03%
- N:
- no more than 0.005%
- with the remainder being Fe and inevitable impurities, and a structure which is characterized in that pearlite accounts for no less than 95 area % and pearlite has an average nodule diameter (P μm) no larger than 30 μm and an average lamella space (S nm) more than 100 nm such that the value of F calculated by the formula below is larger than zero:
- F=350.3/(S)0.5+130.3/(P)0.5−51.7.
Dependencies are inferred from the claim text.