Negative active material, method of preparing the same, negative electrode for lithium secondary battery including negative active material, and lithium secondary battery including negative electrode
US-9306216-B2 · Apr 5, 2016 · US
Spheroidal graphite cast iron
US9822433B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9822433-B2 |
| Application number | US-201414901438-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 26, 2014 |
| Priority date | Jun 28, 2013 |
| Publication date | Nov 21, 2017 |
| Grant date | Nov 21, 2017 |
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Abstract
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A spheroidal graphite cast iron comprising: C: 3.3 to 4.0 mass %, Si: 2.1 to 2.7 mass %, Mn: 0.20 to 0.50 mass %, S: 0.005 to 0.030 mass %, Cu: 0.20 to 0.50 mass %, Mg: 0.03 to 0.06 mass % and the balance: Fe and inevitable impurities, wherein a tensile strength is 550 MPa or more, and an elongation is 12% or more.
First claim
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What is claimed is: 1. A spheroidal graphite cast iron comprising: C: 3.3 to 4.0 mass %, Si: 2.1 to 2.4 mass %, Mn: 0.20 to 0.50 mass %, S: 0.005 to 0.030 mass %, Cu: 0.20 to 0.50 mass %, Mg: 0.03 to 0.06 mass %, Mn and Cu: 0.45 to 0.60 mass % in total and the balance: Fe and inevitable impurities, wherein a tensile strength is 550 MPa or more, and an elongation is 12% or more, a ratio of the content of Si by mass % and the total contents of Mn and Cu by mass % (Si/(Mn+Cu)) is 4.0 to 5.5, the pearlite area ratio is 30 to 55%, and an impact value at normal temperature and −30° C. is 10 J/cm 2 or more, wherein a graphite nodule count is 300/mm 2 or more and an average grain size of graphite is less than 20 μm. 2. The spheroidal graphite cast iron according claim 1 , wherein a percentage brittle fracture of an impact fracture surface at 0° C. is 50% or less.
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- What does patent US9822433B2 cover?
- A spheroidal graphite cast iron comprising: C: 3.3 to 4.0 mass %, Si: 2.1 to 2.7 mass %, Mn: 0.20 to 0.50 mass %, S: 0.005 to 0.030 mass %, Cu: 0.20 to 0.50 mass %, Mg: 0.03 to 0.06 mass % and the balance: Fe and inevitable impurities, wherein a tensile strength is 550 MPa or more, and an elongation is 12% or more.
- Who is the assignee on this patent?
- Kk Riken
- What technology area does this patent fall under?
- Primary CPC classification C22C37/10. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 21 2017 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).