Microalloyed spring

  • US 8,919,752 B2
  • Filed: 06/13/2013
  • Issued: 12/30/2014
  • Est. Priority Date: 04/18/2008
  • Status: Active Grant
First Claim
Patent Images

1. A coil spring in an innerspring assembly in a cushioning article, comprisinga high-carbon steel wire coiled into a helical spring and alloyed with an alloying element wherein the high carbon steel wire includes carbon that is from about 0.50 to about 0.99 weight percent of the spring, wherein the high carbon steel wire has a diameter of 0.04 to 0.11 inches (1.016 to 2.794 millimeters);

  • wherein the alloying element comprises titanium ranging from 0.001 to about 0.1 weight percent of the spring and silicon ranging from 0.001 to less than 0.55 weight percent of the spring, and wherein a total amount of the alloying element is from about 0.001 to about 2 weight percent of the spring.

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