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Stainless steel wire spring

   In addition to the spring with the requirements of corrosion-resistant stainless steel wire, high strength and high fatigue life, but due to different uses, but also requires good high-temperature creep relaxation of resistance to very low temperatures (-196 ℃), magnetic, it is also a requirement, all of these performance Among the features are reflected in the standards.

    ISO 6931-1-1994 (E), the United States ASTM A 313/A313M-2003, Japan J IS G 4314-1994 and China YB (T11-83 Stainless steel spring wire, and several other standards for grades specified, size deviation , mechanical properties, process performance and other major technical indicators are clearly required.

    Stainless steel spring wire is mainly used austenitic and precipitation hardening type 2 categories, such as austenitic grades, represented by 302,304,316. Precipitation hardening grades represented in 631J1. In the standard, the same steel is basically the same chemical composition, melting component tolerances are basically the same. However, the new standard ASTM A 313-2003 increased grade XM28, 241,204, instead of a new grade with Mn Ni. Corresponding increase in the number of U.S. brands, such as the 305,321,347 other prominent feature is the use of a Cr-Ni-Mn-N alloy system to Mn, N elements instead of Ni stable austenite formation. w (Mn) of 11.5% to 14.0% or 6.5% ~ 9.0%, w (N i) of 0.50% to 2.5%, and add N, w (N) 0.20% 0.45% or 0.05% to 0.25%; while 302,304,316 grades were added N, w (N) of 0.10%; Japanese standards have 304N. However, with Mn, N elements instead of Ni is limited, should not only Cr-Ni-Mn-N ratio of scientific and rational, while necessary to P, S and other harmful elements to minimize, otherwise it will have a greater impact resistance to corrosion.