Metric Stainless Steel Washers

The mechanical stability of metric stainless steel washers under high temperature conditions is directly related to the safety of the long-term operation of the equipment. According to the data obtained from the high-temperature short-time tensile test, the yield strength of gaskets made of molybdenum-containing austenitic stainless steel can still maintain more than 72% of the nominal value at room temperature in a constant temperature environment of 300 degrees Celsius. This means that even in hot zone connections such as steam pipelines or engine exhaust flanges, the gaskets still have sufficient resistance to crushing and will not cause a sudden drop in preload force due to softening of the material. At the same time, the linear thermal expansion coefficient of this type of gasket is about 16.5 microns per meter per degree Celsius, which is highly consistent with the main expansion of conventional carbon steel or low alloy steel fasteners. During the thermal cycle caused by frequent starts and stops, the relative expansion and contraction difference between the gasket and the bolt is extremely small, thus effectively avoiding additional loosening tendencies due to thermal stress mismatch, and providing a reliable material basis for durable sealing in thermal alternating environments.

In addition to thermal stability, the anti-relaxation performance of a gasket under long-term load conditions is also a core indicator of its quality. According to the ISO 7500 metal material creep test standard, a constant compressive stress of 75% of the yield strength is applied under normal temperature conditions. After two thousand hours of continuous loading, the residual preload force retention rate can still reach 88.5%. This data intuitively reflects the gasket's ability to resist plastic flow and microstructure evolution, so that flange joints or bearing end caps do not need to be frequently retightened during several years of service. In addition, after precision stamping and deburring process, the parallelism error of the two planes of the gasket is strictly controlled within 0.1 mm. With uniform hardness distribution, it can effectively bridge the microscopic unevenness on the surface of the connecting piece and greatly reduce the probability of medium leakage along the contact interface. Whether used in high-pressure hydraulic systems or chemical media delivery pipelines, this gasket can provide long-term maintenance-free and reliable guarantee for critical bolt connections with balanced mechanical durability and dimensional stability.

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