Invention Grant
- Patent Title: Steel wire rod for high strength and high toughness spring having excellent cold workability, method for producing the same and method for producing spring by using the same
- Patent Title (中): 用于具有优异的冷加工性的高强度和高韧性弹簧的钢丝杆及其制造方法和使用该弹簧的方法
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Application No.: US12445004Application Date: 2007-10-10
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Publication No.: US08734599B2Publication Date: 2014-05-27
- Inventor: Sang Woo Choi , Hoe Young Jung , Yong Tae Shin , Duk Lak Lee , Jeong Do Seo , Jay Hyung Jung , Byoung Ju Park , Jae Seung Lee
- Applicant: Sang Woo Choi , Hoe Young Jung , Yong Tae Shin , Duk Lak Lee , Jeong Do Seo , Jay Hyung Jung , Byoung Ju Park , Jae Seung Lee
- Applicant Address: KR
- Assignee: Posco
- Current Assignee: Posco
- Current Assignee Address: KR
- Agency: The Webb Law Firm
- Priority: KR10-2006-0098940 20061011; KR10-2007-0101347 20071009
- International Application: PCT/KR2007/004924 WO 20071010
- International Announcement: WO2008/044859 WO 20080417
- Main IPC: C22C38/34
- IPC: C22C38/34 ; C22C38/20 ; C22C38/42 ; C21D8/06 ; C21D9/02
Abstract:
Provided is a steel wire rod for a high strength and high toughness spring having excellent cold workability, the steel wire rod having a composition comprising: in weight %, C: 0.4 to 0.7%, Si: 1.5 to 3.5%, Mn: 0.3 to 1.0%, Cr: 0.01 to 1.5%, Ni: 0.01 to 1.0%, Cu: 0.01 to 1.0%, B: 0.005 to 0.02%, Al: 0.1% or less, O: 0.0020% or less, P: 0.02% or less, S: 0.02% or less, N: 0.02% or less, remainder Fe, and other unavoidable impurities, having a microstructure formed of ferrite and pearlite, and in which a prior (before cooling) austenite grain size is 8 μm or less.
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