304 stainless steel
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. High temperature of 800 degrees, with good processing performance, high toughness characteristics, widely used in industrial and furniture decoration industry and food and medical industry.
Common markings on the market are 06Cr19Ni10, SUS304, of which 06Cr19Ni10 generally represents the national standard production, 304 generally means ASTM standard production, SUS 304 that standard production standard.
304 is a versatile stainless steel that is widely used in the manufacture of equipment and components that require good overall performance (corrosion resistance and formability). In order to maintain the inherent corrosion resistance of stainless steel, steel must contain more than 18% of chromium, more than 8% nickel content. 304 stainless steel is produced in accordance with the United States ASTM standard stainless steel a grade.
Chinese name 304 stainless steel English name 304 stainless steel Features Corrosion resistance, good toughness
Tensile strength σb (MPa) ≥ 520
304 stainless steel atlas
304 stainless steel brochure (6 photos)
Conditional yield strength σ0.2 (MPa) ≥205
Elongation rate δ5 (%) ≥40
Section shrinkage ψ (%) ≥60
Hardness: ≤187HBW; ≤ 90HRB; ≤200HV
Density (20 ° C, g / cm 3): 7.93
Melting point (° C): 1398 ~ 1454
Specific heat capacity (0 ~ 100 ℃, KJ · kg-1K-1): 0.50
Thermal conductivity (W · m-1 · K-1): (100 ° C) 16.3, (500 ° C) 21.5
Linear expansion coefficient (10-6 · K-1): (0 to 100 ° C) 17.2, (0 to 500 ° C) 18.4
Resistivity (20 ° C, 10-6Ω · m): 0.73
Longitudinal elastic modulus (20 ° C, KN / mm2): 193 
For 304 stainless steel, the composition of the Ni element is very important, directly determines the 304 stainless steel corrosion resistance and its value.
The most important element in 304 is Ni, Cr, but not limited to these two elements. The specific requirements are specified by the product standard. Industry common judgments that as long as the Ni content of more than 8%, Cr content of more than 18%, it can be considered 304 stainless steel. This is why the industry will be such a stainless steel called 18/8 stainless steel reasons. In fact, the relevant product standards on the 304 has a very clear provisions, and these product standards for different shapes of stainless steel and some differences. Here are some common product standards and tests.
System Description: 304 stainless steel is the most widely used chromium-nickel stainless steel , as a wide range of steel, with good corrosion resistance, heat resistance, low temperature strength and mechanical properties; stamping, bending and other heat Good workability, no heat treatment hardening (using temperature -196 ℃ ~ 800 ℃). In the atmosphere of corrosion resistance, if it is an industrial atmosphere or heavily polluted areas, you need to clean in time to avoid corrosion. Suitable for food processing, storage and transportation production. Has good processing performance and solderability. Plate heat exchanger, bellows, household goods (1,2 class tableware, cabinets, indoor pipelines, water heaters, boilers, bathtubs), auto parts (windshield wipers, muffler, molded products), medical equipment, building materials, chemical, food industry , Agriculture, ship parts and so on. 304 stainless steel is the national recognition of food grade stainless steel.
Most of the use requirements are long-term to maintain the original appearance of the building. In determining the type of stainless steel to be selected, the main consideration is the required aesthetic standards, the corrosiveness of the atmosphere and the clean-up system to be used. However, other applications are increasingly seeking structural integrity or impermeability. For example, the roof and side walls of industrial buildings. In these applications, the owner of the construction costs may be more important than the aesthetic, the surface is not very clean can. In the dry indoor environment using 304 stainless steel effect is quite good. However, in rural areas and cities in order to keep its appearance outdoors, you need to regularly clean. In heavily polluted industrial areas and coastal areas, the surface will be very dirty, and even rust.
But to get the aesthetic effect of outdoor environment, you need to use nickel-containing stainless steel. Therefore, 304 stainless steel is widely used in curtain walls, side walls, roofs and other construction purposes, but in the serious erosion of industrial or marine atmosphere, the best use of 316 stainless steel. Stainless steel sliding doors, people have fully recognized the use of stainless steel in the structure of the superiority. Several design guidelines include 304 and 316 stainless steel. Because the "two-phase" stainless steel 2205 has a good resistance to atmospheric corrosion and high tensile strength and elastic strength of the integration, so the European guidelines also include this steel. Product shape In fact, stainless steel is manufactured in a fully standard metal shape and size, and there are many special shapes. The most commonly used products are made of sheet and strip, and are also produced with plates for special products such as hot rolled structural steels and extruded structural steels. But also round, oval, square, rectangular and hexagonal welded pipe or seamless steel pipe and other forms of products, including profiles, bars, wire and castings.
Etching method: etching process, is the use of stainless steel surface screen printing acid-resistant protective film, and then use ferrous chloride liquid etching, the formation of artistic patterns.
Spray color method: spray color method is in the screen printing after the injection of pigment particles, constitute a pear-like surface, the formation of artistic patterns.
Stamping: stainless steel products, especially stainless steel belt, a lot of time the factory's most original processing is the use of punching stamping products. Stamping, including straight and stretch two ways, the general hardness of less than 1/2 are the use of stretching and bending, hardness is higher than 1/2 hard, are straight.
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