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公开(公告)号：US20210164078A1
公开(公告)日：2021-06-03
申请号：US17261457
申请日：2019-07-19
发明人： Zan YAO , Feng JIN , Genjie WAN , Yanfeng QI , Zhenping WU
摘要： A spring steel having a superior fatigue life, and a manufacturing method for the same. The chemical components thereof are as follows in weight percentage: C: 0.52-0.62%, Si: 1.20-1.45%, Mn: 0.25-0.75%, Cr: 0.30-0.80%, V: 0.01-0.15%, Nb: 0.001-0.05%, N: 0.001-0.009%, O: 0.0005-0.0040%, P: ≤0.015%, S: ≤0.015%, and Al: ≤0.0045%, with the remainder being Fe and incidental impurities, wherein the following condition is also met 0.02≤(2Nb+V)/(20N+C)≤0.40. The spring steel of the present invention has a microstructure of tempered troostite+tempered sorbite, a prior austenite grain size less than 80 um, a size of alloy nitride and carbide precipitates being 5-60 nm, and a maximum width of single-grain inclusions being less than 30 pm. The spring steel has a handling strength greater than 2020 MPa, superior ductility and toughness (the reduction of area≥40%), and a fatigue life≥800,000 times, thereby meeting application requirements of high-stress springs in industries, such as automobiles, machinery, and the like.
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2.发明公开公开(公告)号：US20230295784A1
公开(公告)日：2023-09-21
申请号：US18020999
申请日：2021-08-16
发明人： Zan YAO , Feng JIN , Ziquan YU , Zongze HUANG , Sixin ZHXO , Haoyang ZHAO , Ruiyin ZHAI
CPC分类号： C22C38/24 , C22C38/02 , C22C38/04 , C22C38/002 , C21D8/065 , C21D2211/008 , C21D2211/003
摘要： A high-strength and high-fatigue-life steel for a cable, which comprises, in addition to Fe, the following chemical elements in percentages by mass: 0.90-1.00% of C; 0.90-1.50% of Si; 0.25-0.58% of Mn; 0.20-1.00% of Cr; 0.03-0.12% of V; and 0.0008-0.0025% of Ca. In addition, further provided are a wire rod made of the high-strength and high-fatigue-life steel for a cable and a preparation method for the wire rod.
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