Invention Grant
- Patent Title: High-strength steel wire excellent in ductility and method of manufacturing the same
- Patent Title (中): 延展性优良的高强度钢丝及其制造方法
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Application No.: US11922524Application Date: 2007-04-18
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Publication No.: US08168011B2Publication Date: 2012-05-01
- Inventor: Shingo Yamasaki , Seiki Nishida , Makio Kikuchi
- Applicant: Shingo Yamasaki , Seiki Nishida , Makio Kikuchi
- Applicant Address: JP Tokyo
- Assignee: Nippon Steel Corporation
- Current Assignee: Nippon Steel Corporation
- Current Assignee Address: JP Tokyo
- Agency: Kenyon & Kenyon LLP
- Priority: JP2006-278781 20061012
- International Application: PCT/JP2007/058897 WO 20070418
- International Announcement: WO2008/044356 WO 20080417
- Main IPC: C21D8/06
- IPC: C21D8/06 ; C21D9/52 ; C22C38/02 ; C22C38/14 ; C22C38/04

Abstract:
The invention provides wire rod excellent in drawability and steel wire made from the wire rod as starting material with high productivity at good yield and low cost. A hard steel wire rod of a specified composition is heated in a specified temperature range to conduct post-reaustenization patenting and thereby obtain a high-carbon steel wire excellent in ductility that has a pearlite structure of an area ratio of 97% or greater and the balance of non-pearlite structures including bainite, degenerate-pearlite and pro-eutectoid ferrite and whose fracture reduction of area RA satisfies Expressions (1), (2) and (3) below: RA≧RAmin (1), where RAmin=a−b×pearlite block size (μm), a=−0.0001187×TS (MPa)2+0.31814×TS (MPa)−151.32 (2) b=0.0007445×TS (MPa)−0.3753 (3).
Public/Granted literature
- US20100212786A1 High-Strength Steel Wire Excellent In Ductility and Method of Manufacturing the Same Public/Granted day:2010-08-26
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