High strength spring steel having excellent corrosion resistance
US-2017298486-A1 · Oct 19, 2017 · US
Ultra-high-strength spring steel for valve spring
US10689736B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10689736-B2 |
| Application number | US-201615139231-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 26, 2016 |
| Priority date | Dec 7, 2015 |
| Publication date | Jun 23, 2020 |
| Grant date | Jun 23, 2020 |
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- Title
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Abstract
Official abstract text for this publication.
An ultra-high-strength spring steel for an engine valve spring steel comprises, by weight: 0.5-0.7% of carbon (C), 1.3-2.3% of silicon (Si), 0.6-1.2% of manganese (Mn), 0.6-1.2% of chrome (Cr), 0.1-0.5% of molybdenum (Mo), 0.05-0.8% of nickel (Ni), 0.05-0.5% of vanadium (V), 0.05-0.5% of niobium (Nb), 0.05-0.3% of titanium (Ti), 0.001-0.01% of boron (B), 0.01-0.52% of tungsten (W), 0.3% or less (0% exclusive) of copper (Cu), 0.3% or less (0% exclusive) of aluminum (Al), 0.03% or less (0% exclusive) of nitrogen (N), 0.003% or less (0% exclusive) of oxygen (O), and a remainder of Fe and other inevitable impurities, based on 100% by weight of the ultra-high-strength spring steel.
First claim
Opening claim text (preview).
What is claimed is: 1. An ultra-high-strength spring steel for a valve spring in a vehicle engine, consisting essentially of: 0.5-0.7% by weight of carbon (C), 1.3-2.3% by weight of silicon (Si), 0.6-1.2% by weight of manganese (Mn), 0.6-1.2% by weight of chrome (Cr), 0.1-0.5% by weight of molybdenum (Mo), 0.05-0.8% by weight of nickel (Ni), 0.05-0.5% by weight of vanadium (V), 0.05-0.5% by weight of niobium (Nb), 0.05-0.3% by weight of titanium (Ti), 0.001-0.01% by weight of boron (B), 0.01-0.52% by weight of tungsten (W), 0.3% or less (0% exclusive) by weight of copper (Cu), 0.3% or less (0% exclusive) by weight of aluminum (Al), 0.03% or less (0% exclusive) by weight of nitrogen (N), 0.003% or less (0% exclusive) by weight of oxygen (O), a remainder of iron (Fe), and other inevitable impurities, based on 100% by weight of the ultra-high-strength spring steel, wherein the ultra-high-strength spring steel has a fatigue strength of 1200 MPa or higher, and wherein the ultra-high-strength spring steel has a hardness of 760 HV or higher. 2. The ultra-high-strength spring steel of claim 1 , wherein the ultra-high-strength spring steel has a tensile strength of 3000 MPa or higher. 3. The ultra-high-strength spring steel of claim 1 , wherein the ultra-high-strength spring steel has a yield strength of 2500 MPa or higher. 4. The ultra-high-strength spring steel of claim 1 , wherein the ultra-high-strength spring steel contains inclusions which have a diameter of 15 μm or less. 5. The ultra-high-strength spring steel of claim 4 , wherein the inclusions are contained at a fraction of 10% or less with a diameter of 10-15 μm in the total inclusions and at a fraction of 90% or more with a diameter of less than 10 μm in the total inclusions.
Assignees
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Classifications
Martensite · CPC title
containing N · CPC title
with molybdenum or tungsten · CPC title
- C22C38/54Primary
with boron · CPC title
containing aluminium · CPC title
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Frequently asked questions
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- What does patent US10689736B2 cover?
- An ultra-high-strength spring steel for an engine valve spring steel comprises, by weight: 0.5-0.7% of carbon (C), 1.3-2.3% of silicon (Si), 0.6-1.2% of manganese (Mn), 0.6-1.2% of chrome (Cr), 0.1-0.5% of molybdenum (Mo), 0.05-0.8% of nickel (Ni), 0.05-0.5% of vanadium (V), 0.05-0.5% of niobium (Nb), 0.05-0.3% of titanium (Ti), 0.001-0.01% of boron (B), 0.01-0.52% of tungsten (W), 0.3% or less…
- Who is the assignee on this patent?
- Hyundai Motor Co Ltd, Hyundai Steel Co, Korea Inst Sci & Tech
- What technology area does this patent fall under?
- Primary CPC classification C22C38/54. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jun 23 2020 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 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).