Spring steel having good durability and sag-resistance
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United States of America Patent
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Apr 23, 1991
Grant Date -
N/A
app pub date -
May 22, 1990
filing date -
May 29, 1989
priority date (Note) -
Expired
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Abstract
A spring steel having a good durability and a good sag-resistance consisting essentially of by weight 0.35-0.55% carbon, 1.80-3.00% silicon, 0.50-1.50% manganese, 0.50-3.00% nickel, 0.10-1.50% chromium, 0.01-0.05% aluminum and 0.010-0.025% nitrogen, the remainder being iron and inevitable impurities. The spring steel has been completed for the purpose of obtaining a spring steel having a high toughness in a high hardness of not less than HRC 55 and having a good sag-resistance, in particular examining the contents of nickel, chromium and nitrogen in addition to the carbon content.
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