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304 stainless steel/SUS304
304 stainless steel is a common material in stainless steel, the density of 7.93 g/cm³; the industry is also called 18/8 stainless steel, meaning that contains more than 18% chromium and more than 8% nickel; high-temperature resistance of 800 ℃, with good processing properties, high toughness characteristics, widely used in industry and furniture decoration industry and food medical industry. But it should be noted that food-grade 304 stainless steel compared with ordinary 304 stainless steel, its content indicators are more stringent. For example, the international definition of 304 stainless steel is basically mainly containing chromium 18%-20% nickel 8%-10%, but food grade 304 stainless steel is containing chromium 18% and nickel 8%, allowing a specific range of fluctuations, and limiting the content of various heavy metals. In other words, it is 304 stainless steel is not necessarily food-grade 304 stainless steel
The common labeling methods in the market are 06Cr19Ni10, and SUS304, where 06Cr19Ni10 generally indicates the national standard production, 304 generally indicates the ASTM standard production, and SUS 304 indicates the Japanese standard production.
304 is general-purpose stainless steel, which is widely used to make equipment and machine parts that require good overall performance (corrosion resistance and formability). In order to maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 18% chromium and 8% nickel content. 304 stainless steel is a grade of stainless steel produced in accordance with ASTM standards.
Stainless Steel (Metal Material)
Stainless Steel (Stainless Steel) is defined according to GB/T20878-2007 as a steel with stainless and corrosion resistance as its main characteristics and with a chromium content of at least 10.5% and a maximum carbon content of no more than 1.2%.
Stainless Steel (Stainless Steel) is the abbreviation of stainless acid-resistant steel, resistant to weak corrosive media such as air, steam, water or stainless steel is called stainless steel; and will be resistant to chemically corrosive media (acid, alkali, salt and other chemical leaching) corrosion of steel is called acid-resistant steel.
Due to the differences in the chemical composition of the two and their corrosion resistance is different, ordinary stainless steel is generally not resistant to chemical media corrosion, while acid-resistant steel is generally stainless. The term “stainless steel” does not simply refer to a stainless steel, but indicates that more than one hundred industrial stainless steel, each stainless steel developed in its specific application has good performance. The key to success is first to identify the application and then to determine the correct steel grade. There are usually only six steel grades related to the application area of building construction. They all contain 17 to 22 percent chromium, and the better grades also contain nickel. The addition of molybdenum can further improve atmospheric corrosion, especially the resistance to corrosion of atmospheres containing chlorides.
As a general rule, stainless steel is harder than aluminum alloys, and stainless steel costs more than aluminum alloys.
304: General type; i.e. 18/8 stainless steel. Products such as: corrosion resistant containers, tableware, household furniture, railings, medical equipment. The standard composition is 18 % chromium plus 8 % nickel. The GB grade is 06Cr19Ni10, which is a non-magnetic stainless steel whose metallographic structure cannot be changed by heat treatment.
316: After 304, the second most widely used steel grade, mainly used in the food industry, watches and jewelry, pharmaceutical industry and surgical equipment, the addition of molybdenum elements to obtain a special structure to resist corrosion. SS316 is commonly used in nuclear fuel recovery devices. 18/10 grade stainless steel is also commonly used in this application class.
316 L: Low carbon so more corrosion resistant, easy to heat treat, products such as: chemical processing equipment, nuclear power generators, refrigerant storage.