Will the raw material properties of stainless steel jewelry be different?
Will the raw material properties of stainless steel jewelry be different? The answer is yes, although its materials are all stainless steel, but there are differences. Generally, it can be divided into the following types according to the structure of the base stainless steel:
①Austenitic-ferritic duplex stainless steel. It combines the advantages of austenitic and ferritic stainless steel strips with superplasticity.
②Austenitic stainless steel. It contains more than 18% chromium, about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. It has good comprehensive performance and is resistant to corrosion by various media.
③ Ferritic stainless steel. Contains 12% to 30% chromium. Its corrosion resistance, toughness and weldability increase with the increase of chromium content, and its resistance to chloride stress corrosion is better than other types of stainless steel strips.
④ Martensitic stainless steel. High strength, but poor plasticity and weldability. Steel that is resistant to weak corrosive media such as air, steam, and water, and chemically corrosive media such as acid, alkali, and salt. Also known as stainless acid-resistant steel.
In the processing and transformation of stainless steel jewelry, how can we divide different types of stainless steel by different chemical compositions? The steel that is resistant to weak corrosive media is called stainless steel strip, and the steel that is resistant to chemical media is called acid-resistant steel. Due to the difference in chemical composition of these two different types of steel, jewelry processing plants are used to make stainless steel jewelry. The former is not necessarily resistant to chemical corrosion, while the latter is generally stainless. The corrosion resistance of stainless steel depends on the alloying elements contained in the steel.
Chromium is the basic element for stainless steel to obtain corrosion resistance. When the content of chromium in steel reaches about 12%, chromium and oxygen in the corrosive medium will form a thin oxide film (self-passivation film) on the surface of stainless steel jewelry. ) to prevent further corrosion of the base of the jewelry. In addition to chromium, the commonly used alloying elements are nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the requirements of various uses for the structure and properties of stainless steel.
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