304 stainless steel density 7.93 g/cm3 austenitic stainless steel are generally used this value 304 chromium content (%) 17.00-19.00, nickel content (%) 8.00-10.00, 304 is equivalent to China's 0Cr19Ni9 (0Cr18Ni9) stainless steel
304 stainless steel is a general-purpose stainless steel material, rust resistance than the 200 series of stainless steel material is stronger. It is also better in terms of high temperature resistance.
304 stainless steel has excellent stainless corrosion resistance and better resistance to intergranular corrosion.
For oxidizing acid, it is concluded in the experiment: concentration ≤ 65% of the boiling temperature below the nitric acid, 304 stainless steel has a strong resistance to corrosion. To alkali solutions and most organic and inorganic acids also have good corrosion resistance.
First, dry grinding brushed
The most common on the market are long wire and short wire, 304 stainless steel plate after processing such surface, showing good decorative effect, can meet the requirements of general decorative materials. Generally speaking, 304 series stainless steel can be in a grinding will form a good effect. Due to the low cost of such processing equipment, simple operation, low processing costs, wide range of applications, to become a processing center must choose equipment. So most processing centers can provide long and short filament abrasive plate, of which 304 steel accounts for more than 80%.
Second, oil grinding wire drawing
304 family stainless steel after oil grinding reflects the perfect decorative effect, widely used in elevators, home appliances and other decorative panels. Cold-rolled 304 stainless steel can generally achieve good results after a grinding process, there are some processing centers in the market can provide hot-rolled stainless steel oil grinding process, the effect and cold-rolled oil grinding is not comparable. Oil brushing also has a long wire and short wire. Elevator decoration generally choose long wire, and all kinds of small appliances, kitchenware and other two kinds of grain are available.
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 most important difference is that 316 contains Mo, and generally recognized, 316 corrosion resistance is better than 304 in high-temperature environment more corrosion-resistant. So in high-temperature environment, engineers will generally choose 316 material parts. But the so-called thing is not absolute, in the concentrated sulfuric acid environment, and then the high temperature do not use 316! Learn mechanical people have learned thread, remember in order to prevent thread galling at high temperatures, need to apply a black solid lubricant: molybdenum disulfide (MoS2), from which 2 conclusions are not: [1] Mo is indeed a high temperature-resistant substances (know what crucible gold melting? Molybdenum crucible!) . [2]: Molybdenum can easily react with high-valent sulfur ions to generate sulfides. So there is no stainless steel is super invincible corrosion resistance. In the end, stainless steel is a piece of impurities (but these impurities can be more resistant to corrosion than steel ^ ^) more steel, is steel can react with other substances.
Steel Grade | Density(g/cm3) |
304,304L,305,321 201,202,301,302 | 7.93 |
316,316L,347 309S,310S | 7.98 |
405,410,420 | 7.75 |
409,430,434 | 7.7 |
The corrosion resistance of stainless steel plate mainly depends on its alloy composition (chromium, nickel, titanium, silicon, aluminum, manganese, etc.) and internal organizational structure, the main role is played by the element chromium.
Chromium has a high chemical stability, can form a passivation film on the surface of the steel, so that the metal and the outside world isolated, to protect the steel plate from oxidation, increase the corrosion resistance of the steel plate. After the passivation film is destroyed, the corrosion resistance decreases.
It is required to withstand the corrosion of various acids, such as: oxalic acid, sulfuric acid-iron sulfate, nitric acid, nitric acid-hydrofluoric acid, sulfuric acid-copper sulfate, phosphoric acid, formic acid and acetic acid.
Widely used in: chemical, food, medicine, paper, petroleum, atomic energy, construction, kitchenware, tableware, vehicles, household appliances, etc.
Applications
304 is widely used in household products (1 and 2 types of tableware), cabinets, indoor piping, water heaters, boilers, bathtubs, auto parts, medical appliances, building materials, chemicals, food industry, agriculture, and ship parts.