97cm ironing board cover_tablecloth with umbrella hole

Stress relief is achieved by heating the spring to a temperature below its deformation point, making the wire malleable without melting it. After heating, the spring is gradually cooled back to room temperature, allowing the molecules to realign.

MBHD Carbon Steel: Medium basic carbon cold drawn spring wire per ASTM 227, suitable for parts subjected to average stress and applications; also suited to static orvery low cycles
Music Wire: Spring wire, per ASTM-228, good for parts subjected to high stresses and requiring good thermal properties. For temperatures up to 250°F
Type 302/304 Stainless Steel: Springs are manufactured to meet ASTM-A313, a high quality wire. For temperatures up to 550°F. Slightly magnetic. It is the most widelyused stainless spring wire because of high corrosion resistance properties and good tensile strength.
Black Oxide Coating (good) or Zinc Plating (better):improves the corrosion resistance of HDMB Carbon Steel and Music Wire
Passivation:an acid treatment performed on Stainless Steel Wire to remove contaminants and improve corrosion resistance
Nickel-coated Stainless Steel Springs: made from Suzuki^™ Wire^®, Nippon-Seisen wire and Sumiden® Type 302 nickel-coated stainless steel for superior corrosionresistance particularly in marine environments. Nickel plating is used in electronics because it provides a good surface for soldering, prevents tarnishing, and conductselectricity well.