72 THE DISTRIBUTOR’S LINK SPIROL INTERNATIONAL CORP. 30 Rock Avenue, Danielson, CT 06239 TEL 1-860-774-8571 FAX 1-860-774-2048 EMAIL info@spirol.com WEB www.spirol.com TYPE 316 STAINLESS STEEL COILED SPRING PINS by Christopher Jeznach, Product Engineer The versatility of Coiled Spring Pins often times makes them the ideal fastener to meet the specific engineering and economic objectives of pinning applications. They are available in a wide variety of sizes, duties, finishes, and materials. Amongst the materials used to manufacture Coiled Spring Pins, stainless steel is often required for its high corrosion resistance. Coiled Spring Pins are most often manufactured from Type 302/304 and Type 420 stainless steel, but Type 316 is also available and is typically selected for its superior corrosion resistance. This paper takes a closer look at how Type 316 compares to Type 302/304, and discusses various applications and environments where it offers an advantage. the fully annealed state, and having the ability to workharden. Before going into specifics on Type 316, it will help to first briefly explain how Type 302 and Type 304 are alloyed, and what allows for each one to attain its corrosion resistance. Each of the 300 series stainless steels shown in Table 1 are alloyed with more nickel than Type 420 stainless steel, and have higher chromium content. (Type 420 stainless has 0.5% max nickel and 12–14% chromium.) This enables 300 series stainless steel to have higher resistance to corrosion, namely pitting and stress corrosion cracking. Additionally, the 300 series stainless steels have less carbon content than some other types of stainless steel, which helps them Chemical Composition Even though Type 302 and Type 304 stainless steel are technically two different materials, they closely overlap in their chemical composition and properties. Because of this, steel mills can melt the material such that they meet both Type 302 and Type 304 specifications. Therefore, manufacturers refer to austenitic Spring Pins as Type 302/304 and this naming convention will be used throughout this paper. Table 1 compares the chemical composition of the austenitic stainless steel types used for Coiled Spring Pins. Austenitic refers to the structure of the metal, and classifies the stainless steel as not heat treatable, non-magnetic at TABLE 1 - CHEMICAL COMPOSITION (%) OF AUSTENITIC STAINLESS STEEL GRADES USED FOR SPIROL COILED SPRING PINS to have higher corrosion resistance by reducing the ability for carbides to form at grain boundaries and ultimately cause intergranular corrosion (known as sensitization). The main composition difference between Type 316 and Type 302/304, is that Type 316 is alloyed with 2-3% molybdenum, which increases resistance to pitting corrosion by improving the passive film durability. The passive film, typically an oxide, is a “clear, invisible” layer on the metal surface that improves corrosion protection. TECHNICAL ARTICLE CONTINUED ON PAGE 142
CRESCENT MANUFACTURING 700 George Washington Turnpike, Burlington, CT 06013 TEL 1-860-673-2591 FAX 1-860-673-5973 EMAIL sales@crescentmanufacturing.com WEB www.crescentmanufacturing.com Crescent Manufacturing is pleased to announce that it recently acquired the major assets including extensive machinery, a broad range of heading and threading tooling, and the customer list and files of Perfection Screw and Rivet. Perfection Screw and Rivet was founded in 1952 and produced thousands of different cold headed parts for a wide range of hundreds of customers. This acquisition expands Crescent Manufacturing’s tooling and manufacturing capability. Crescent will be able to manufacture smaller diameter parts in longer lengths. Crescent’s product range is from triple ought (000) to 3/8 inch in diameter and up to three inches long. All of this equipment, tooling, and customer files have been relocated from Perfection’s location in Wolcott, Connecticut to Crescent’s newly expanded facility in Burlington, Connecticut. BUSINESS FOCUS ARTICLE CRESCENT IS EXPANDING THE DISTRIBUTOR’S LINK 73 In addition Crescent Manufacturing is excited to announce that three new manufacturing representatives are partnering with Crescent. Adam Reich of Reich Sales based in Westlake, Ohio is covering Ohio, Michigan, Indiana, Western Upstate New York, and Western Pennsylvania. Adam may be reached at 440-463-1202 or by e-mail at adam@reichsales.com Jerry Keefe of RGS Sales, Inc. is covering Illinois, Iowa, and Nebraska. Jerry is based in East Moline, Illinois and may be reached by at 309-314-5049 or by e-mail at rgsjkeefe@mchsi.com Craig Cooper of Westerra Marketing Associates, Inc. is based in Portland, Oregon. Craig is covering Oregon, Washington, Idaho, and Western Canada. Craig may be reached by at 916-390-1983 or by e-mail at craig@westerramarketing.com CRESCENT MANUFACTURING
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