The lock nuts made of stainless steel 304M, 304HC, and 316 are called stainless steel lock nuts. They are 300 series austenitic stainless steels. 304M, 304HC, and 316 are the most widely used 300 series austenitic stainless steels. One of the materials. The obvious difference between the materials is: the magnetic properties of the material after cold working are 316<304hc<304m. Compared with 304m and 304hc, 316 material resists chemical corrosion, pitting corrosion and seawater corrosion resistance. The main chemical composition has a certain relationship with the performance of stainless steel. <p="">
Carbon C can increase hardness and strength, too high content will reduce its ductility and corrosion resistance; chromium Cr can increase corrosion resistance, oxidation resistance, refine the grain, increase strength, hardness and wear resistance; nickel Ni It can increase high temperature strength and corrosion resistance, and reduce the rate of cold work hardening; molybdenum Mo increases strength and has excellent corrosion resistance to oxides and seawater; copper Cu is good for cold forming and reduces magnetic properties
The above materials are non-magnetic in normal state. 304M is slightly magnetic after cold working (about 1.6u-2.0u); 304HC is magnetic (about 1.01u-1.6u); 316 material is less than 1.01u after cold working.
Each material has good ductility, is easy to be cold processed and formed, and its tensile strength and yield strength can meet the requirements. (Ts tensile strength min 700N/mm, Ys yield strength min 450N/mm)
In short, the characteristics of stainless steel lock nuts are corrosion resistance, beautiful appearance, and sanitation, but their strength and hardness are equivalent to carbon steel (grade 6.8) under normal conditions. Therefore, stainless steel products should not be impacted or beaten, and the surface finish and precision should be maintained. Do not apply force randomly or excessively like using carbon steel products. At the same time, due to the good ductility of stainless steel, steel chips generated during use are easy to stick to the thread level of the nut, increase the friction force, and easily lead to locking. The use of carbon steel will fall off even if iron filings are produced, which is not easy to lock up compared to stainless steel.
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