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What are the main uses, products and applications of stainless steel?
Most of the requirements of the long-term use of the building to maintain the original appearance. In determining the type of stainless steel to be selected, the main criteria considered are the aesthetic standards required, the corrosivity of the site's atmosphere, and the cleaning regime to be used. However, more and more applications are seeking structural integrity or impermeability. For example, roofs and side walls of industrial buildings. In these applications, the owner's construction costs may be more important than the aesthetic, the surface is not very clean also. 304 stainless steel works well in dry indoor environments.
However, in rural areas and cities, it is necessary to conduct regular cleaning if they want to maintain their appearance outdoors. In heavily polluting industrial and coastal areas, the surface can be very dirty and even produce rust. But to obtain the aesthetic effect of the outdoor environment, you need to use nickel-containing stainless steel. Therefore, 304 stainless steel is widely used in curtain wall, side wall, roof and other construction purposes, but in aggressive industrial or marine atmosphere, the best 316 stainless steel. There are several design guidelines for 304 and 316 stainless steel.
Because "Duplex" stainless steel 2205 combines good atmospheric corrosion resistance with high tensile and elastic strength, the European directive also includes this type of steel. Product shape, in fact, stainless steel is manufactured with the full standard metal shape and size, but also many special shapes. The most commonly used products are made of sheet and strip, but also the production of special products in plates, for example, hot-rolled structural steel and extruded structural steel. But also round, oval, square, rectangular and hexagonal welded or seamless steel pipe and other forms of products, including profiles, bars, wires and castings. To meet the aesthetics of architects, a number of different commercial surface finishes have been developed.
3d printing area
Stainless steel itself has good corrosion resistance, high temperature stainless steel can still maintain its excellent physical and mechanical properties and other characteristics in the 3d printing area is also widely used.
Antibacterial stainless steel
The detection by authoritative units, antibacterial stainless steel on Escherichia coli, Staphylococcus aureus kill rate of more than 99% of other bacteria such as Candida albicans, such as also have significant Killing role, showed excellent broad spectrum Antibacterial and antimicrobial persistence. National Institute of Drugs and Biological Products test showed that antibacterial stainless steel in terms of toxicity and human safety in full compliance with national technical standards. While giving stainless steel antibacterial properties, mechanical properties, corrosion resistance, hot and cold processing, welding and other properties equivalent to the original stainless steel.
Antibacterial stainless steel successfully developed for the development of antibacterial products provide a broad space. Antibacterial stainless steel product development potential is huge, the market prospect is extremely broad. Many domestic manufacturers have already expressed their strong interest in antibacterial stainless steel in today's society. The research group is actively seeking to support the pilot program and strive to bring the achievement into commercialization as soon as possible.
Precipitation hardening stainless steel
Has good formability and good weldability, can be used as ultra-high strength materials in the nuclear industry, aerospace and aerospace industries.
It can be divided into Cr series (400 series), Cr-Ni series (300 series), Cr-Mn-Ni series (200 series), heat resistant chrome alloy steel (500 series) and precipitation hardening series (600 series)
200 Series: Chromium-Manganese-Nickel
201,202, etc.: Manganese nickel, corrosion resistance is relatively poor, the domestic widely used as a cheap alternative 300 series
300 Series: Chromium-nickel austenitic stainless steel
301: good ductility, for molding products. It can also be rapidly hardened by machining. Good weldability. Anti-wear and fatigue strength is better than 304 stainless steel.
302: Corrosion resistance 304, better strength due to higher carbon content.
303: It is easier to cut than 304 by adding a small amount of sulfur and phosphorus.
304: Universal model; that 18/8 stainless steel. Products such as: corrosion containers, tableware, furniture, railings, medical equipment. The standard ingredients are 18% chromium plus 8% nickel. Non-magnetic, can not be changed by heat treatment of the microstructure of stainless steel. GB grade 0Cr18Ni9Ti.
304 L: the same characteristics as 304, but the low carbon is more corrosion-resistant and heat-treated, but the mechanical properties are not suitable for welding and heat-resistant products.
304 N: same as 304, is a nitrogen-containing stainless steel, nitrogen is added to improve the strength of the steel.
309: better temperature than 304, temperature up to 980 ℃.
309 S: with a large amount of chromium, nickel, so the heat resistance, good oxidation resistance, products such as: heat exchangers, boiler components, jet engine.
310: excellent high temperature oxidation resistance, the maximum temperature of 1200 ℃.
316: After 304, the second most widely used steel grade, mainly used in the food industry, watches and clocks, the pharmaceutical industry and surgical equipment, adds molybdenum to a special corrosion-resistant structure. It is also used as "marine steel" due to its better corrosion resistance than chloride. SS316 is usually used in nuclear fuel recovery unit. 18/10 grade stainless steel is usually also in line with this application level.
316 L: low carbon is more corrosion-resistant, easy to heat treatment, products such as: chemical processing equipment, nuclear generators, cryogen storage.
321: Other properties similar to 304 except that the addition of titanium reduces the risk of material weld corrosion.
347: Add stabilizing element niobium, suitable for welding aviation equipment parts and chemical equipment.
400 Series: Ferritic and martensitic stainless steel, manganese-free, to some extent replace 304 stainless steel
408: Good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni.
409: The cheapest model (Anglo-American), usually used as a car exhaust pipe, is a ferritic stainless steel (chrome steel).
410: Martensite (high-strength chromium steel), good wear resistance, corrosion resistance is poor.
416: The addition of sulfur improves the processability of the material.
420: "cutting tool grade" martensitic steel, similar to Briggs high chrome steel the earliest stainless steel. Also used for surgical tools that can be done very brightly.
430: Ferritic stainless steel for decorative purposes, eg for car accessories. Good formability, but poor temperature resistance and corrosion resistance.
440: high-strength cutting tool steel, carbon slightly higher, after appropriate heat treatment can get higher yield strength, hardness can reach 58HRC, is the most hard of stainless steel. The most common application example is the "razor blade." There are three commonly used models: 440A, 440B, 440C, in addition to 440F (easy processing type).
500 Series: Heat-resistant chrome alloy steel.
600 Series: Martensitic precipitation hardened stainless steel.
Stainless steel mesh
Stainless steel mesh is mainly used for filtration products, also known as stainless steel filter.
Material: SUS201,202,302,304,316,304 L, 316L, 321 stainless steel wire.
Braiding: Plain, twill, dense weave.
Mesh: Stainless steel mesh specifications 1 head - 635 mesh. I-shaped woven up to 2800 mesh.
Uses: Stainless steel mesh woven wire mesh is mainly used for acid, alkali screening and filtration under the environmental conditions, the oil industry for the mud net, chemical fiber chemical industry for sieving, electroplating industry for pickling, gas, liquid filtration and other Media separation.
According to the calorie classification: stainless steel mesh belt, conveyor belt, metal conveyor belt, stainless steel conveyor belt, metal mesh belt, metal conveyor belt, stainless steel transmission belt, metal drive belt and so on.
Classified by purpose: Widely used in glass products industry annealing furnace mesh belt, barbecue flower with furnace mesh belt. Food processing industry, dehydrated vegetables, quick-frozen frozen food pre-processing network with network, chain network. Powder metallurgy, metal heat treatment, quenching, sintering, brazing, baking, bright, black, bearings, carburizing high temperature furnace mesh belt, baffle mesh belt, coating drying line conveyor belt, foam nickel reduction production line , Washing machines, elevators, dryers, dryers, curing furnace mesh belt. The transfer process chain network, with network.
According to the material classification: 1cr13 mesh belt, 201 mesh belt, 304 mesh belt, 316 mesh belt and so on.
Classified by shape: Herringbone Mesh Belt, Mesh Belt, Diamond Mesh Belt, Horseshoe Mesh Belt, Chain Belt Conveyor, Glasses Mesh Belt, Chain Plate Mesh Belt, Ball Mesh Belt
Expansion of stainless steel products: stainless steel mesh belt, mesh belt, conveyor belt, metal mesh belt, high temperature mesh belt, mesh with the Great Wall, B mesh belt, stainless steel jewelry, expansion of all products are made of stainless steel wire, stainless steel plate manufacturing.
Austenitic type is non-magnetic or weakly magnetic, martensite and ferrite are magnetic. Austenite after cold working, the structure and organization will be transformed into martensite, and then become larger magnetic. Therefore, life said by magnet adsorption to distinguish the pros and cons of stainless steel, the authenticity of the method is one-sided and wrong.
Stainless steel surface processing level
The original surface: NO.1 after hot rolled heat treatment and pickling surface. Generally used for cold rolled materials, industrial tanks, chemical industrial installations, thicker by 2.0MM-8.0MM.
Blunt: NO.2D after cold-rolled by heat treatment, pickling, the soft material, the surface was silver-white gloss, for deep drawing processing, such as automotive components, pipes and so on.
Matte: NO.2B after cold-rolled by heat treatment, pickling, and then finishing the surface so that the moderate light of those who. As the surface is smooth, easy to reground, so that the surface more bright, versatile, such as cutlery, building materials. With surface treatment to improve mechanical properties, almost all uses are met.
Grit NO.3 with 100-120 grinding with abrasive belt products. Has a better gloss, with discontinuous coarse lines. For building interior and exterior decoration materials, electrical products and kitchen equipment.
Fine sand: NO.4 with 150-180 size grinding belt grinding out of the product. Has better gloss, with non-continuous coarse lines, stripes thinner than NO.3. For the bath, inside and outside the building decoration materials, electrical products, kitchen equipment and food equipment.
# 320 with 320 grinding tape products. Has a better gloss, with non-continuous coarse lines, stripes thinner than NO.4. For the bath, building interior and exterior decoration materials, electrical products, kitchen equipment and food equipment.
Hairline HAIRLINE: HLNO.4 A product of ground pattern (Subdivision 150-320) is produced by continuous grinding of a suitably sized polishing belt. Mainly used for building decoration, elevators, building doors, panels and so on.
Bright: BA after cold-rolled by bright annealing, and after the formation of the product. Excellent surface gloss, high reflectivity. Like the mirror surface. For home appliances, mirrors, kitchen equipment, decorative materials.
There are many reasons why surface finishing of stainless steel is important in architectural applications. Corrosion environment requires a smooth surface because the surface is not easy to scale fouling. Dirt deposition can rust stainless steel or even cause corrosion.
In the spacious hall, stainless steel is the most commonly used materials for elevator trim, although the surface of the handprints can be erased, but the impact on the beautiful, it is best to use the appropriate surface to prevent leaving fingerprints.
Hygienic conditions are important for many industries such as food processing, catering, brewing and chemical where the surfaces must be cleansed daily and chemical cleaners are often used.
Stainless steel is the best material in this area. Stainless steel surfaces are often sketched in public places, but one of its key features is the ability to clean them, a notable feature of stainless steel over aluminum. Aluminum surface easily leave traces, often difficult to remove. Stainless steel clean up the surface should be cleaned along the lines of stainless steel, because some of the surface processing is unidirectional texture.
Stainless steel is best suited for hospitals or other areas where hygienic conditions are critical, such as: food processing, catering, brewing and chemicals, not only because it is convenient for daily cleaning, sometimes for chemical cleaning but also because it is not easy to breed bacteria . Tests show that the performance in this area is the same as glass and ceramic.