月度归档：8 月 2024

304 stainless steel

Performance introduction：304 stainless steel is the most common steel, as a widely used steel, has good corrosion resistance, heat resistance, low temperature strength and mechanical properties; Stamping, bending and other hot processing is good, no heat treatment hardening phenomenon (non-magnetic, then use the temperature -196℃ ~ 800℃).

Scope of application：Household goods (Class 1 and 2 tableware, cabinets, indoor plumbing, water heater, boiler, bathtub)

Auto parts (windshield wipers, mufflers, molding products)

Medical equipment, building materials, chemicals, food industry, agriculture, Marine components

304L stainless steel (L is low carbon)

Performance introduction：As a low-carbon 304 steel, in the general state, its corrosion resistance is similar to that of 304, but after welding or stress relief, its grain boundary corrosion resistance is excellent; In the absence of heat treatment, it can also maintain good corrosion resistance, and the use temperature is -196℃ ~ 800℃.

Scope of application：It is used in chemical, coal and petroleum industry with high grain boundary corrosion resistance, heat resistant parts of building materials and parts with difficulty in heat treatment.

The two most commonly used stainless steel 304,316 (or corresponding to the German/European standard 1.4308,1.4408), 316 and 304 in the chemical composition of the main difference is that 316 contains Mo, and it is generally recognized that 316 corrosion resistance is better than 304 in high temperature environment more corrosion resistance. Therefore, in a high temperature environment, engineers generally choose parts of 316 material. But the so-called thing is not absolute, in the concentrated sulfuric acid environment, then the high temperature do not use 316. Otherwise it can be a big thing. People who learn machinery have learned threads, remember that in order to prevent thread bite at high temperatures, you need to apply a black solid lubricant: molybdenum disulfide (MoS2), from which you can draw two conclusions: one: Mo is indeed a kind of high-temperature material (know what crucible to melt gold? Molybdenum crucible!) . Two: Molybdenum is easy to react with high sulfur ions to produce sulfide. So no stainless steel is super resistant to corrosion. In the end, stainless steel is a piece of impurities (but these impurities can be more corrosion resistant than steel) more steel, steel can react with other substances.

304 stainless steel is a common material in stainless steel, with a density of 7.93 g/cm³; The industry is also known as 18/8 stainless steel, which means containing more than 18% chromium and more than 8% nickel; High temperature resistance 800℃, has the characteristics of good processing performance, high toughness, widely used in industrial and furniture industry and food, medical industry. However, it should be noted that compared with ordinary 304 stainless steel, food-grade 304 stainless steel has a more stringent content index. For example, the international definition of 304 stainless steel is mainly chromium 18%-20% nickel 8%-10%, but food-grade 304 stainless steel is chromium 18% and nickel 8%, allowing a certain range of fluctuations, and limiting the content of various heavy metals. In other words, 304 stainless steel is not necessarily food-grade 304 stainless steel

Among the common marking methods on the market are 06Cr19Ni10 and SUS304, of which 06Cr19Ni10 generally means national standard production, 304 generally means ASTM standard production, and SUS304 means daily standard production.

304 is a versatile stainless steel, which is widely used in the production of equipment and parts requiring good comprehensive properties (corrosion resistance and formability). In order to maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 18% chromium and more than 8% nickel content. 304 stainless steel is a grade of stainless steel produced according to ASTM standards in the United States.