Surface finishing grades, characteristics and uses
Original surface: NO.1 after hot rolling with heat treatment and acid treatment of the surface. Generally used in cold rolling materials, industrial tanks, chemical equipment, etc., the thickness is thicker than 2.0MM-8.0MM.
Blunt surface: NO.2D cold rolling, after heat treatment and pickling, the material is soft, the surface of silver white luster, used for deep stamping processing, such as automotive components, pipes and so on.
Fog: NO.2B after cold rolling by heat treatment and pickling, and then finishing processing to make the surface of moderate brightness. As the surface is smooth, easy to re grinding, make the surface more bright, wide range of uses, such as tableware, building materials, etc.. Surface treatment with improved mechanical properties almost meets all uses.
Coarse sand NO.3 products made from abrasive No. 100-120. Having better gloss; having discontinuous coarse lines. Used for building interior and exterior decoration materials, electrical appliances and kitchen equipment, etc..
Fine sand: NO.4 abrasive products with abrasive grit No. 150-180. Having better gloss, discontinuous coarse lines, and thinner stripes than NO.3. It is used for bath, building interior and exterior decoration materials, electrical appliances, kitchen equipment and food equipment, etc..
#320 grinding products with No. 320 abrasive belt. Having better gloss, discontinuous coarse lines, and thinner stripes than NO.4. It is used for bath, building interior and exterior decoration materials, electrical appliances, kitchen equipment and food equipment, etc..
Continuous grinding surface by NO.4 HAIRLINE:HL filament proper size generating grinding polishing abrasive pattern of the products (subdivision No. 150-320). Mainly used for building decoration, elevators, building doors, panels and so on.
Bright surface: BA after cold rolling, with bright annealing, and after the smooth products. Excellent surface gloss and high reflectivity. Like the surface of a mirror. For household electrical appliances, mirrors, kitchen equipment, decorative materials, etc..
Product characteristics and Applications
SUS304: has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, stamping, bending and other hot workability, no heat treatment hardening phenomenon, no magnetism. Widely used in household appliances (1, 2 types of tableware), cabinets, indoor pipelines, water heaters, boilers, bathtubs, auto parts, medical equipment, building materials, chemicals, food industry, agriculture, marine components.
SUS304L: the basic austenitic steel, the most widely used; corrosion resistance and excellent heat resistance; low temperature strength and excellent mechanical properties; single phase austenite non hardening heat treatment (non magnetic, temperature -196–800 C).
SUS304Cu: using 17Cr-7Ni-2Cu as the basic composition of austenitic stainless steel; excellent formability, especially drawing and anti aging crack and good corrosion resistance; – the same as 304.
SUS316: corrosion resistance and high temperature strength is particularly good, can be used in harsh conditions, work hardening good, without magnetism. Suitable for marine equipment, chemicals, dyes, paper making, oxalic acid, fertilizer production equipment, photography, food industry, coastal facilities
SUS316L: Mo (2-3%) is added in steel, so the corrosion resistance and high temperature strength are good; SUS316L carbon content is lower than SUS316; therefore, intergranular corrosion resistance is better than SUS316; high temperature creep strength is high. Can be used in harsh conditions, work hardening good, without magnetism. Suitable for marine equipment, chemicals, dyes, paper making, oxalic acid, fertilizer production equipment, photography, food industry, coastal facilities
SUS321: Ti is added to 304 steel, so it has good intergranular corrosion resistance, high temperature strength and high temperature resistance to oxygen, high cost and poor processability than SUS304. Heat resistant materials, automobiles, aircraft exhaust pipes, boilers, furnace covers, pipes, chemical installations, heat exchangers
SUH409H: good processability, good weldability, good oxidation resistance at high temperature, able to withstand the temperature range from room temperature to 575 degrees. Widely used in automobile exhaust gas exhaust system.
SUS409L: control C and N content in steel, the weldability, forming excellent resistance and corrosion resistance; with 11%Cr, high temperature and normal temperature with a structure of BCC ferritic stainless steel; due to fill in the Ti, 750 DEG C air oxidation and corrosion resistance.
SUS410: martensite represents steel, high strength, high hardness (magnetic), poor corrosion resistance, not suitable for severe corrosive environment, low C content, good processability, surface hardening by heat treatment.
SUS420J2: martensite represents steel, high strength, high hardness (magnetic), poor corrosion resistance, poor processing, good wear resistance, heat treatment, mechanical performance improvement. Widely used in cutting tools, nozzles, valves, plates, rulers, tableware.
SUS430: low thermal expansion rate, molding and oxidation resistance, suitable for heat resistant appliances, burners, household appliances, 2 types of tableware, kitchen sink. Low price and good processability are ideal alternatives to SUS304. They are good against mile corrosion, and are typically non heat treated hardened ferritic stainless steels.
Source: China Pipe Fittings Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)