Stainless steel CNC machined parts processed products are gradually valued as the primary material, and stainless steel processing has a history of less than a century.Steel with a carbon content of 0.4% has good corrosion resistance when it contains 9% to 16% chromium. This is the earliest stainless steel.
After mechanical processing, Strau88, Ma, R, and others in Germany pointed out through research that steels containing sufficient amounts of chromium and nickel (Ni) have oxidation and acid resistance.From 1917 to 1918, France produced special steels containing chromium 5% to 15% and nickel 20% to 40% based on the research results of Chevenard.During this period, the United States also conducted research on the corrosion resistance of chromium-containing steel and promoted the application of chromium-containing stainless steel.
cnc machining these are the early results of ferritic, martensitic and austenitic stainless steels as we know them today.In the application of stainless steel, people gradually feel insufficient in machining. Austenitic stainless steel parts have good corrosion resistance, but the strength is low, and the strength cannot be adjusted by hot cooking. Therefore, the machining of stainless steel parts with high strength requirements is unsuitable for applications.Although the processing of martensitic stainless steel parts can be adjusted by hot cooking methods to ensure high mechanical strength, its corrosion resistance is slightly worse, so its application is limited.
Therefore, machining gradually opens up the processing of precipitation-hardened stainless steel parts that not only have good corrosion resistance, but also can adjust mechanical properties through thermal cooking methods.
With the expansion of the scope of application of stainless steel parts, and the increase of stress corrosion cracking accidents due to uneven local corrosion of components in certain media, scientists have paid attention, and developed a new type of stainless steel, which has iron Duplex stainless steel formed by two phases: ferrite and austenite.
Through nearly 100 years of development, stainless steel has made five major series of iron and steel materials, including ferrite system, martensitic system, austenite system, precipitation hardening system and ferrite-austenite system (dual-phase stainless steel system). Occupy the first place in the steel world.
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