Spring steel, spring, and manufacturing method of spring
Inactive Publication Date: 2016-05-05
CHUO SPRING
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Benefits of technology
The present invention relates to a new type of spring steel with specific compositions that can be used without adding expensive elements like nickel (Ni) or vanadium (V). The new spring steel contains specific amounts of carbon (C), silicon (Si), manganese (Mn), chromium (Cr), nickel (Ni), copper (Cu), and other elements like iron (Fe) and impurities. The new spring steel does not contain any significant amounts of vanadium (V). The invention provides a method for manufacturing a spring using this new spring steel, which includes steps of hot setting and warm shot peening. The resulting spring has improved corrosion resistance and fatigue resistance, while keeping its performance at a high level. The invention reduces the cost of manufacturing springs by reducing the added amount of Ni and not adding V.
Problems solved by technology
Ni and V are costly, and thus the overall cost of such springs tends to be high.
Method used
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examples
[0055]Examples in which the present disclosure is realized will be explained below. Note that the examples explained below are specific examples for explaining the present disclosure and do not limit the present disclosure.
1. Durability Test
[0056](1) Preparation of Springs
[0057]Springs 1 to 3 were prepared by using sample 1, which is a spring steel having the chemical composition shown in Table 1 below; comparative spring 1 was prepared by using comparative sample 1. This manufacturing method will be explained. Note that the numbers in Table 1 represent the mass % of each of components with respect to the mass of each of the samples. First, a steel ingot obtained by melting each material in a blast furnace or an electric arc furnace on a scale equivalent to a mass production was split into slabs and rolled, and thereafter rolled into wire materials.
TABLE 1(mass %)CSiMnPSCrCuNiVTiBSample 10.51.990.50.0050.0050.280.240.24—0.060.002Comparative0.491.930.710.0110.0010.2—0.540.16——sample ...
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Abstract
A spring steel contains, in terms of mass %, C: 0.35% or more and 0.55% or less, Si: 1.60% or more and 3.00% or less, Mn: 0.20% or more and 1.00% or less, Cr: 0.10% or more and 1.50% or less, Ni: 0.05% or more and 0.30% or less, and Cu: 0.05% or more and 1.00% or less, and substantially does not contain V, the remainder being Fe and unavoidable impurities.
Description
CROSS-REFERENCE TO RELATED APPLICATION[0001]The present application is a related application of, and claims priority to, Japanese Patent Application No. 2013-117874 filed on Jun. 4, 2013, the entire contents of this Japanese patent application are hereby incorporated by reference into the present application.TECHNICAL FIELD[0002]The present specification relates to a spring steel, a spring, and a manufacturing method of the spring.BACKGROUND TECHNOLOGY[0003]In recent years, there has been a growing demand for spring steels and springs having high strength. In Patent Literature 1 to 4, springs are disclosed that excel in durability and resistance to sag as well as springs that excel in corrosion fatigue strength.CITATION LISTPatent Literature[0004]Patent Literature 1: Japanese Patent Application Laid-Open No. H3-2354[0005]Patent Literature 2: Japanese Patent Application Laid-Open No. 2008-106365[0006]Patent Literature 3: Japanese Patent Application Laid-Open No. 2003-55741[0007]Paten...
Claims
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Login to View More IPC IPC(8): C21D9/02C22C38/50C22C38/42C21D6/00C22C38/04C22C38/00C21D8/00C21D7/06C22C38/54C22C38/34
CPCC21D9/02C22C38/54C22C38/50C22C38/42C22C38/34C21D6/008C22C38/002C21D8/005C21D7/06C21D6/004C21D6/005C22C38/04C22C38/00C22C38/46
InventorKUNO, TAKANORI
OwnerCHUO SPRING