Delving into the world of stainless steel wires, we find four prominent types often utilized in the spring industry. While most stainless-steel wire is a combination of 70% iron with the remaining 30% consisting of Chromium, Nickel, and other alloys, each type has unique properties.
1. Stainless 302/304:
Often termed as "18/8" stainless, this signifies its composition of 18% Chromium and 8% Nickel.
Renowned for its durability, ductility, and commendable corrosion resistance.
A notable difference: Type 304 has a marginal reduction in carbon content compared to 302, enhancing corrosion resistance but slightly reducing tensile strength. This often allows 302 to replace 304 where superior corrosion resistance isn't crucial.
2. Stainless 316:
Boasts a heightened resistance to corrosion due to its increased molybdenum and nickel content compared to 302/304.
However, its tensile strength is somewhat lower than 302/304.
3. Stainless 17-7:
Comprises 17% Chromium and 7% Nickel, with a crucial 1% addition of aluminum.
This variant can endure surface temperatures about 180-200°F more than the 302/304 types and possesses a far superior tensile strength compared to 302/304/316.
Stainless Steel Production & Costs: Several redraw mills in the US produce stainless-steel wire from rod stock. With North American Stainless (NAS) leading as the primary rod producer, they play a pivotal role in determining the stainless-steel wire market price. It's also noteworthy that a significant volume of stainless steel is imported from Europe and Korea.
Unique to stainless steel is a fluctuating "tax" or surcharge, predominantly influenced by the market prices of nickel, chromium, molybdenum, and iron, with nickel being the most significant price driver.
Given the premium costs associated with Stainless Steel – one of the most expensive materials used at Southern Precision Spring – we're consistently vigilant about market dynamics affecting its price.
Got Questions about Stainless Steel Springs? Reach out to us! We're always here to assist and provide insights.