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The Benefits of 420 Chrome Stainless Steel Coiled Spring Pins

The Benefits of 420 Chrome Stainless Steel Coiled Spring Pins
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The Benefits of 420 Chrome Stainless Steel Coiled Spring Pins - 1

WHITE PAPER The Benefits of 420 Chrome Stainless Steel Coiled Spring Pins by Michael Pasko, Applications Engineer SPIROL Connecticut SPIROL invented the Coiled Spring Pin in 1948. Coiled Pins are used in many industries including: automotive, medical, heavy equipment, military, aerospace, and consumer products. In applications requiring a combination of high strength, superior fatigue life, and corrosion resistance, 420 martensitic chrome stainless steel offers a host of technical benefits and provides an overall robust cost-effective solution. Strength SPIROL’s 420 stainless steel Coiled Spring Pins are hardened to values approximating their high carbon steel equivalents and share the same minimum rated shear strength. This process also develops desired spring properties and fatigue resistance. Chrome stainless steel Coiled Pins also offer good corrosion protection against most common atmospheric and environmental conditions without the risk of rapid work hardening associated with 302/304 austenitic stainless steel. In most cases, 420 chrome stainless steel Coiled Spring Pins may be used as drop in replacements for high carbon steel pins assuming galvanic potential has been considered relative to the host material. Corrosion Resistance When corrosion resistant Spring Pins are required, there are (2) common options: • Carbon steel with a sacrificial protective plating or coating • Stainless steel alloys which are inherently corrosion resistant Platings and coatings provide excellent performance though they are consumed over time, whereas stainless steel provides a lifetime of protection providing free oxygen is available in the environment (free oxygen allows the fastener’s protective chromium oxide layer to reform if damaged). For plated and coated parts, once the plating or coating is depleted, the carbon steel is left unprotected and rapidly corrodes. 420 martensitic chrome stainless steel provides good corrosion resistance in environments, including but not limited to: • Normal atmosphere and humidity • Steam • Fresh water • Alcohol • Ammonia • Alkalis • Mild acids (ex. carbonic) • Petroleum products such as gasoline, oil, crude, etc. • Mild detergents & sterilising solutions Coiled Spring Pins are offered in light, standard and heavy duty to meet application-specific requirements Corrosion progress Exposure time Stainless steel Coated steel This graph shows how time impacts the corrosion resistance of coated steel compared with stainless steel While 302/304 austenitic stainless steel Coiled Pins provide excellent corrosion protection, this material is not an appropriate solution when the pin will be subject to dynamic loads, or where strength and fatigue resistance must equal or exceed that of high carbon steel. Alternatively, 420 martensitic chrome stainless steel provides an exceptional combination of strength and fatigue resistance - in addition to its inheren

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The Benefits of 420 Chrome Stainless Steel Coiled Spring Pins - 2

Fatigue Life Innovative fastening solutions. steel Lower enhanced fatigue life – an important provides assembly costs. 420 chrome stainless consideration given that Coiled Spring Pins are often intended to function as dynamic elements within many applications. A unique characteristic of Coiled Spring Pins is that their flexibility after installation protects host holes and assemblies by dampening vibration and shock loading. For the purpose of comparison, Coiled Pins of the same duty (i.e. material thickness) produced from material of equal dimensions, were tested in the three standard...

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