Processing grade and use of bearing surface

2021-06-26 16:57

Original surface: NO.1 The surface subjected to heat treatment and pickling treatment after hot rolling. Generally used for cold-rolled materials, industrial tanks, chemical industrial equipment, etc., the thickness is thicker from 2.0MM to 8.0MM.


Blunt surface: NO.2D cold-rolled after heat treatment and pickling, its material is soft, and the surface is silver-white luster, used for deep drawing processing, such as automotive components, water pipes, etc.


Matte surface: NO.2B after cold rolling, heat treatment, pickling, and then finishing rolling to make the surface moderately bright. Because the surface is smooth and easy to re-grind, it makes the surface brighter and has a wide range of uses, such as tableware, building materials, etc. After adopting the surface treatment to improve the mechanical properties, it can meet almost all purposes.


Coarse sand NO.3 is a product grinded with No. 100-120 grinding belt. It has better gloss and discontinuous rough lines. Used in building interior and exterior decoration materials, electrical products and kitchen equipment, etc.


Fine sand: NO.4 is a product grinded with grit size 150-180 grinding belt. It has better gloss, discontinuous rough lines and finer stripes than NO.3. Used in baths, interior and exterior decoration materials of buildings, electrical products, kitchen equipment and food equipment, etc.


#320 It is a product polished with No. 320 polishing belt. It has better gloss, has discontinuous rough lines, and has finer stripes than NO.4. Used in baths, interior and exterior decoration materials of buildings, electrical products, kitchen equipment and food equipment, etc.


Hairline surface HAIRLINE: HL NO.4 is a product that produces a grinding pattern after continuous grinding with a polishing belt of appropriate granularity (subdivided No. 150-320). Mainly used for building decoration, elevators, building doors, panels, etc.


Bright surface: BA is a product obtained by bright annealing after cold rolling and smoothing. The surface gloss is excellent and has a high reflectivity. Like a mirror surface. Used in home appliances, mirrors, kitchen equipment, decoration materials, etc.


SUS304: has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, good hot workability such as stamping and bending, no heat treatment hardening phenomenon, non-magnetic. Widely used in household products (category 1, 2 tableware), cabinets, indoor pipelines, water heaters, boilers, bathtubs, auto parts, medical appliances, building materials, chemicals, food industry, agriculture, and ship parts.


SUS304L: Austenitic basic steel, the most widely used; excellent corrosion resistance and heat resistance; excellent low temperature strength and mechanical properties; single-phase austenite structure, no heat treatment hardening phenomenon (non-magnetic, use temperature -196-- 800°C).


SUS304Cu: Austenitic stainless steel with 17Cr-7Ni-2Cu as the basic composition; excellent formability, especially good wire drawing and ageing crack resistance;-the same corrosion resistance as 304.


SUS316: Very good corrosion resistance and high temperature strength, can be used under harsh conditions, good work hardening, non-magnetic. Suitable for sea water equipment, chemistry, dyes, papermaking, oxalic acid, fertilizer production equipment, photography, food industry, coastal facilities.


SUS316L: Mo (2-3%) is added to the steel, so it has excellent corrosion resistance and high temperature strength; SUS316L has a lower carbon content than SUS316, so it has better intergranular corrosion resistance than SUS316; high temperature creep strength. It can be used under harsh conditions, with good work hardening and non-magnetic. Suitable for seawater equipment, chemistry, dyes, papermaking, oxalic acid, fertilizer production equipment, photography, food industry, coastal facilities.


SUS321: Ti is added to 304 steel, so it has excellent intergranular corrosion resistance; high temperature strength and high temperature oxygen resistance; high cost, and poorer processability than SUS304. Heat-resistant materials, exhaust pipes of automobiles and aircraft, boiler covers, pipes, chemical devices, heat exchangers.


SUH409H: Good processing performance, good welding performance, good high temperature oxidation resistance, and can withstand the temperature range from room temperature to 575℃. It is widely used in automobile exhaust system.


SUS409L: Control the content of C and N in the steel, so it has excellent weldability, formability and corrosion resistance; it contains 11% Cr and is a ferritic stainless steel with BCC structure at high and normal temperatures; it is filled with Ti, below 750℃ Available in oxidation and corrosion resistance.


SUS410: Martensite represents the steel grade, with high strength and high hardness (magnetic); poor corrosion resistance, not suitable for use in severely corrosive environments; low C content, good workability, and the surface can be hardened by heat treatment.


SUS420J2: Martensite represents the steel grade, with high strength and high hardness (magnetic); poor corrosion resistance, poor processing and formability, and good wear resistance; it can be heat treated to improve mechanical properties. It is widely used for processing knives, nozzles, valves, rulers, and tableware.


SUS430: Low thermal expansion rate, good molding and oxidation resistance. Suitable for heat-resistant appliances, burners, home appliances, class 2 tableware, kitchen sinks. Low price, good workability is an ideal substitute for SUS304; good corrosion resistance, typical non-heat treatment hardenable ferritic stainless steel.


In particular, 316 and 317 stainless steel (see below for the properties of 317 stainless steel) are molybdenum-containing stainless steels. The molybdenum content in 317 stainless steel is slightly higher than that in 316 stainless steel. Due to the molybdenum in steel, the overall performance of this steel is better than 310 and 304 stainless steel. Under high temperature conditions, when the concentration of sulfuric acid is lower than 15% and higher than 85%, 316 Stainless steel has a wide range of uses. 316 stainless steel also has good chloride corrosion properties, so it is usually used in marine environments.


316L stainless steel has a maximum carbon content of 0.03, which can be used in applications that cannot be annealed after welding and require maximum corrosion resistance.


Corrosion resistance: The corrosion resistance is better than 304 stainless steel, and it has good corrosion resistance during the pulp and paper production process. Moreover, 316 stainless steel is also resistant to the erosion of the ocean and the corrosive industrial atmosphere.


Heat resistance: 316 stainless steel has good oxidation resistance in the intermittent use below 1600 degrees and continuous use below 1700 degrees: in the range of 800-1575 degrees, it is best not to continuously act on 316 stainless steel. When 316 stainless steel is used continuously outside the temperature range, the stainless steel has good heat resistance. 316L stainless steel has better resistance to carbide precipitation than 316 stainless steel, and the above-mentioned temperature range can be used.


Heat treatment: annealing in the temperature range of 1850-2050 degrees, then rapid annealing, and then rapid cooling. 316 stainless steel cannot be hardened by heat treatment.


Welding: 316 stainless steel has good welding performance. All standard welding methods can be used for welding. During welding, 316Cb, 316L or 309Cb stainless steel filler rods or welding rods can be used according to the application. In order to obtain the best corrosion resistance, the welded section of 316 stainless steel needs to be annealed after welding. If 316L stainless steel is used, post-weld annealing treatment is not required.


Typical applications: heat exchangers for pulp and paper equipment, dyeing equipment, film washing equipment, pipelines, and exterior use of buildings in coastal areas.