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Spring steel wire rod excellent in decarburization resistance and wire drawing workability and method for producing same
US9005378B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9005378-B2 |
| Application number | US-19243708-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 15, 2008 |
| Priority date | Sep 10, 2007 |
| Publication date | Apr 14, 2015 |
| Grant date | Apr 14, 2015 |
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Abstract
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Disclosed is a spring steel wire rod that comprises C in a range of 0.35 to 0.65% (mass %, the same applies to respective elements described hereinafter), Si in a range of 1.4 to 2.2%, Mn in a range of 0.10 to 1.0%, Cr in a range of 0.1 to 2.0%, P not more than 0.025% (0% excluded), and S not more than 0.025% (0% excluded), balance comprising iron, and unavoidable impurities, wherein an average grain size Dc of a central part of the steel wire rod is not more than 80 μm while an average grain size Ds of a surface layer part of the steel wire rod is not less than 3.0 μm.
First claim
Opening claim text (preview).
What is claimed is: 1. A spring steel wire rod comprising: Fe; C in a range of 0.35 to 0.65% mass; Si in a range of 1.4 to 2.2% mass; Mn in a range of 0.10 to 1.0% mass; Cr in a range of 0.1 to 2.0% mass; P not more than 0.025% mass (0% excluded); and S not more than 0.025% mass (0% excluded), wherein an average grain size Dc of a central part of the steel wire rod is more than 20 μm and not more than 80 μm, and an average grain size Ds of a surface layer part of t…
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- C22C38/18Primary
Chemistry & Metallurgy · mapped topic
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- What does patent US9005378B2 cover?
- Disclosed is a spring steel wire rod that comprises C in a range of 0.35 to 0.65% (mass %, the same applies to respective elements described hereinafter), Si in a range of 1.4 to 2.2%, Mn in a range of 0.10 to 1.0%, Cr in a range of 0.1 to 2.0%, P not more than 0.025% (0% excluded), and S not more than 0.025% (0% excluded), balance comprising iron, and unavoidable impurities, wherein an average…
- Who is the assignee on this patent?
- Kochi Takuya, Murakami Shogo, Kuroda Takeshi, and 2 more
- What technology area does this patent fall under?
- Primary CPC classification C22C38/18. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Apr 14 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).