Electrical steel sheet and method for manufacturing same
US-12163066-B2 · Dec 10, 2024 · US
Highly durable coil spring steel
US10000831B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10000831-B2 |
| Application number | US-201615151755-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 11, 2016 |
| Priority date | Dec 15, 2015 |
| Publication date | Jun 19, 2018 |
| Grant date | Jun 19, 2018 |
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Abstract
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Disclosed are a steel composition and a spring steel comprising the same. The steel composition comprises: an amount of about 0.51 to 0.57% by weight of carbon (C), an amount of about 1.35 to 1.45% by weight of silicon (Si), an amount of about 0.95 to 1.05% by weight of manganese (Mn), an amount of about 0.60 to 0.80% by weight of chromium (Cr), an amount of about 0.25 to 0.35% by weight of copper (Cu), an amount of about 0.05 to 0.15% by weight of vanadium (V), an amount of about 0.25 to 0.35% by weight of nickel (Ni), an amount of about 0.003 to 0.015% by weight of phosphorus (P), an amount of about 0.003 to 0.010% by weight of sulfur (S), and iron (Fe) constituting the remaining balance of the steel composition, all the % by weights are based on the total weight of the steel composition.
First claim
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What is claimed is: 1. A coil spring steel comprising a steel composition, wherein the steel composition comprises: an amount of about 0.51 to 0.57% by weight of carbon (C), an amount of about 1.35 to 1.45% by weight of silicon (Si), an amount of about 0.95 to 1.05% by weight of manganese (Mn), an amount of about 0.60 to 0.80% by weight of chromium (Cr), an amount of about 0.25 to 0.35% by weight of copper (Cu), an amount of about 0.05 to 0.15% by weight of vanadium (V), an amount of about 0.25 to 0.35% by weight of nickel (Ni), an amount of about 0.003 to 0.015% by weight of phosphorus (P), an amount of about 0.003 to 0.010% by weight of sulfur (S), and iron (Fe) constituting the remaining balance of the steel composition, all the % by weights based on the total weight of the steel composition, wherein the coil spring steel has a general fatigue life of about 750,000 or greater under a repeated stress condition of up to about 120 kgf/mm 2 when subjected to a general fatigue life test after molding of a spring, wherein the coil spring steel has a corrosion fatigue life of about 500,000 times or greater under conditions of salt water-spraying and a repeated stress of up to about 60 kgf/mm 2 when subjected to a corrosion fatigue life test after molding of a spring. 2. The coil spring steel of claim 1 , wherein the steel composition consists essentially of: an amount of about 0.51 to 0.57% by weight of carbon (C), an amount of about 1.35 to 1.45% by weight of silicon (Si), an amount of about 0.95 to 1.05% by weight of manganese (Mn), an amount of about 0.60 to 0.80% by weight of chromium (Cr), an amount of about 0.25 to 0.35% by weight of copper (Cu), an amount of about 0.05 to 0.15% by weight of vanadium (V), an amount of about 0.25 to 0.35% by weight of nickel (Ni), an amount of about 0.003 to 0.015% by weight of phosphorus (P), an amount of about 0.003 to 0.010% by weight of sulfur (S), and iron (Fe) constituting the remaining balance of the steel composition, all the % by weights based on the total weight of the steel composition. 3. The coil spring steel of claim 1 , wherein the steel composition consists of: an amount of about 0.51 to 0.57% by weight of carbon (C), an amount of about 1.35 to 1.45% by weight of silicon (Si), an amount of about 0.95 to 1.05% by weight of manganese (Mn), an amount of about 0.60 to 0.80% by weight of chromium (Cr), an amount of about 0.25 to 0.35% by weight of copper (Cu), an amount of about 0.05 to 0.15% by weight of vanadium (V), an amount of about 0.25 to 0.35% by weight of nickel (Ni), an amount of about 0.003 to 0.015% by weight of phosphorus (P), an amount of about 0.003 to 0.010% by weight of sulfur (S), and iron (Fe) constituting the remaining balance of the steel composition, all the % by weights based on the total weight of the steel composition. 4. The coil spring steel of claim 1 , wherein the coil spring steel has an outermost-surface ferrite decarbonization depth of about 1 μm or less after molding of a spring. 5. A vehicle part comprising a coil spring steel of claim 1 . 6. A vehicle that comprises a vehicle part of claim 5 . 7. The coil spring steel of claim 1 , wherein the steel composition comprises: an amount of about 0.52 to 0.57% by weight of carbon (C), an amount of about 1.37 to 1.44% by weight of silicon (Si), an amount of about 0.96 to 1.03% by weight of manganese (Mn), an amount of about 0.62 to 0.79% by weight of chromium (Cr), an amount of about 0.25 to 0.34% by weight of copper (Cu), an amount of about 0.07 to 0.15% by weight of vanadium (V), an amount of about 0.29 to 0.33% by weight of nickel (Ni), an amount of about 0.004 to 0.014% by weight of phosphorus (P), an amount of about 0.004 to 0.009% by weight of sulfur (S), and iron (Fe) constituting the remaining balance of the steel composition, all the % by weights based on the total weight of the steel composition.
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- What does patent US10000831B2 cover?
- Disclosed are a steel composition and a spring steel comprising the same. The steel composition comprises: an amount of about 0.51 to 0.57% by weight of carbon (C), an amount of about 1.35 to 1.45% by weight of silicon (Si), an amount of about 0.95 to 1.05% by weight of manganese (Mn), an amount of about 0.60 to 0.80% by weight of chromium (Cr), an amount of about 0.25 to 0.35% by weight of cop…
- Who is the assignee on this patent?
- Hyundai Motor Co Ltd, Hyundai Steel Co
- What technology area does this patent fall under?
- Primary CPC classification C22C38/02. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jun 19 2018 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).