Fine grain steel alloy and automotive components formed thereof
US-2018372146-A1 · Dec 27, 2018 · US
Crankshaft and method of manufacturing forged material for crankshaft
US12403526B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12403526-B2 |
| Application number | US-202017754862-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 2, 2020 |
| Priority date | Nov 7, 2019 |
| Publication date | Sep 2, 2025 |
| Grant date | Sep 2, 2025 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
A crankshaft with improved fatigue strength and machinability is provided. The crankshaft includes a pin and journal, having a chemical composition of, in mass %: 0.40 to 0.60% C; 0.01 to 1.50% Si; 0.4 to 2.0% Mn; 0.01 to 0.50% Cr; 0.20 to 0.50% Al; 0.001 to 0.02% N; up to 0.03% P; 0.005 to 0.20% S; 0.005 to 0.060% Nb; 0 to 0.060% Ti; and balance Fe and impurities, wherein, for each of the pin and journal, the hardness measured at a position at a depth of ¼ of the diameter from the surface is higher than HV 245, the microstructure at that position is mainly composed of ferrite/pearlite, and the fraction of ferrite is not lower than 16%.
First claim
Opening claim text (preview).
The invention claimed is: 1. A crankshaft including a pin and a journal, having a chemical composition consisting of, in mass %: 0.48 to 0.60% C; 0.01 to 1.50% Si; 0.4 to 2.0% Mn; 0.01 to 0.50% Cr; 0.20 to 0.50% Al; 0.001 to 0.02% N; up to 0.03% P; 0.005 to 0.20% S; 0.005 to 0.060% Nb; 0 to 0.060% Ti; and balance Fe and impurities, wherein, for each of the pin and journal, a hardness measured at a position at a depth of ¼ of a diameter from a surface is not lower than HV 250, a microstructure at that position is mainly composed of ferrite and pearlite, and a fraction of ferrite is not lower than 16%, wherein the hardness is measured in accordance with JIS Z 2244 (2009) and the testing force is to be 300 gf (2.942 N). 2. The crankshaft according to claim 1 , wherein the Ti content is 0.005 to 0.060 mass %. 3. The crankshaft according to claim 1 , wherein the fraction of ferrite is not higher than 26%. 4. The crankshaft according to claim 1 , wherein the hardness is not higher than HV 278.
Assignees
Inventors
Classifications
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US12403526B2 cover?
- A crankshaft with improved fatigue strength and machinability is provided. The crankshaft includes a pin and journal, having a chemical composition of, in mass %: 0.40 to 0.60% C; 0.01 to 1.50% Si; 0.4 to 2.0% Mn; 0.01 to 0.50% Cr; 0.20 to 0.50% Al; 0.001 to 0.02% N; up to 0.03% P; 0.005 to 0.20% S; 0.005 to 0.060% Nb; 0 to 0.060% Ti; and balance Fe and impurities, wherein, for each of the pin …
- Who is the assignee on this patent?
- Nippon Steel Corp
- What technology area does this patent fall under?
- Primary CPC classification C21D9/30. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Sep 02 2025 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 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).