COIL SPRING STEEL
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United States of America Patent
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Issued Date -
Jun 8, 2017
app pub date -
May 17, 2016
filing date -
Dec 4, 2015
priority date (Note) -
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Abstract
a coil spring steel which includes: 0.4 to 0.9 wt % of carbon (C); 1.3 to 2.3 wt % of silicon (Si), 0.5 to 1.2 wt % of manganese (Mn); 0.1 to 0.5 wt % of molybdenum (Mo); 0.05 to 0.80 wt % of nickel (Ni); 0.05 to 0.50 wt % of vanadium (V); 0.01 to 0.50 wt % of niobium (Nb); 0.05 to 0.30 wt % of titanium (Ti); 0.6 to 1.2 wt % of chromium (Cr); 0.0001 to 0.3 wt % of aluminum (Al); less than or equal to 0.3 wt % but greater than 0% of copper (Cu); less than or equal to 0.3 wt % but greater than 0% of nitrogen (N); 0.0001 to 0.0030 wt % of oxygen (O); and a balance of iron (Fe) and unavoidable impurities.
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