Invention Grant
- Patent Title: Steel wire rod for high-strength spring excellent in wire drawability, manufacturing method therefor, and high-strength spring
- Patent Title (中): 钢丝拉丝性优良的高强度弹簧用线材及其制造方法以及高强度弹簧
-
Application No.: US13813961Application Date: 2011-08-30
-
Publication No.: US09097306B2Publication Date: 2015-08-04
- Inventor: Tomonobu Ishida , Nao Yoshihara , Shuhei Kitamura
- Applicant: Tomonobu Ishida , Nao Yoshihara , Shuhei Kitamura
- Applicant Address: JP Kobe-shi
- Assignee: Kobe Steel, Ltd.
- Current Assignee: Kobe Steel, Ltd.
- Current Assignee Address: JP Kobe-shi
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2010-192836 20100830
- International Application: PCT/JP2011/069664 WO 20110830
- International Announcement: WO2012/029812 WO 20120308
- Main IPC: B21B1/16
- IPC: B21B1/16 ; B21F35/00 ; C22C38/18 ; C22C38/34 ; C22C38/38 ; C21D9/02 ; F16F1/02 ; F16F1/04 ; C21D8/06 ; C21D9/52 ; B21B3/00

Abstract:
Provided are: a steel wire rod material for a high-strength spring, which does not undergo the increase in deformation resistance arising from the increase in hardness and can exhibit good wire-drawing processability and the like even when a heat treatment, which deteriorates productivity, is eliminated or a simplified and rapid heat treatment is employed instead; a useful method for producing the steel wire rod material for a high-strength spring; a high-strength spring produced using the steel wire rod material for a high-strength spring as a material; and others. This steel wire rod material for a high-strength spring is a steel wire rod material that has been hot-rolled already, and has a texture having a specified chemical composition and mainly composed of pearlite, wherein the average value (Pave) of the pearlite nodule size numbers and the standard deviation (Pσ) of the pearlite nodule size numbers fulfill the following formulae (1) and (2), respectively: 9.5≦Pave≦12.0; (1) and 0.2≦Pσ≦0.7 (2).
Public/Granted literature
Information query
IPC分类: