The hot dipped galvanized steel water tank defers to the GB code 92SS177 manufactured new type water tank. The manufacture and the installment of tank have no influence of the construction. There are not needed the welding apparatus, the surface is hot dipped galvanize antiseptic treatment. It's artistic durable, prevents two times pollution to water quality and it beneficial to human health. The water tank meets the construction product standardization, the serration and the factorization request.
Hot Dip Galvanized Water Tank application:
1) Storage and regulation of living water supply & construction water supply;
2) Rainwater Harvesting & Storage;
3) Effluent / Acid and alkali solution treatment & storage;
4) Hosptial, buildings, building site, school and other place;
5) Temporary water storage for expansion of the heating system, condensate tank and construction, geological survey, industry, national defense project etc.
Hot Dip Galvanized Water Tank Hot Dip Galvanized Water Tank,Galvanized Water Tank,Hot Dip Galvanizing Equipment,Galvanized Tank Shandong Hiking International Commerce Group Co.,Ltd , https://www.hikingfrp.com
/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>New skills and development direction of bearing steel (2) New skills and development direction of bearing steel (2)
In the aspect of heat treatment; progress has been made in improving the quality of spheroidizing annealing; obtaining fine, uniform, spherical carbides and shortening the annealing time or canceling the spheroidizing annealing process; that is, the wire rod production is selected twice to arrange annealing; After the 720 ° C ~ 730 ° C recrystallization annealing to 760 ° C arrangement annealing. This can get low hardness, good spheroidization, no network of carbide arrangements; the key to ensure that the central pull reduction rate ≥ 14%. The process improves the power of the heat treatment furnace by 25%~30%. The continuous spheroidizing annealing heat treatment skill is the development direction of the bearing steel heat treatment. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
All countries are researching and developing new bearing steels; expanding and replacing traditional bearing steels, such as fast carburizing bearing steels; and modifying the chemical composition to improve the carburizing speed; the carbon content is 0.08%~0. 20% progressed to about 0. 45%; carburization time was shortened from 7 hours to 30 minutes. Developed high-frequency hardened bearing steel; used medium carbon steel or medium carbon manganese, chrome steel; replaced by high frequency heating quenching Bearing steel; both simplified the production process and reduced the cost; and improved the use of life.
The fatigue life of GCr465 and SCM465 developed in Japan is 2~4 times higher than that of SUJ 2. Because of the high temperature, corrosion and smooth conditions, the use of bearings is more and more; the M50 (CrMo4V) and 440C (9Cr18Mo) ​​used in the past Bearing steel can not be satisfactorily used; there is an urgent need for research and development of processing functions, low cost, long fatigue life, suitable for different intentions and useful bearing steel; such as high temperature carburizing steel M50NiL, easy to process stainless bearing steel 50X18M and Ceramic bearing data, etc. Aligned with the low hardenability of GCr15SiMn steel; China developed high hardenability and hardenability bearing steel GCr15SiMo; its hardenability HRC≥60; hardenability J60≥25mm.GCr15SiMo touch fatigue life L10 and L50 are 73% and 68% better than GCr15SiMn; under the same operating conditions; the bearing life of G015SiMo steel is twice that of GCr15SiMo steel. In these years, China has also developed energy saving and resource saving. Impact-resistant GCr4 bearing steel. Compared with GCr15; GCr4 impact value improved by 66%~104%; fracture toughness improved by 67%; touch fatigue life L10 improved by 12%. GCr4 steel bearing used high temperature heating surface quenching heat treatment Compared with the fully-hardened GCr15 steel bearing; the life of GCr4 steel bearing is significantly improved; it can be used for heavy-duty high-speed train bearings. The bearing steel is mainly developed in two directions: high cleanliness and functional diversification. Progressive bearing steel Cleanliness; in particular, the oxygen content in the steel; the life of the bearing can be significantly extended. The oxygen content is reduced from 28 ppm to 5 ppm; the fatigue life can be extended by one order of magnitude. In order to extend the life of the bearing steel; Has always been committed to the development of the use of elite skills to reduce the oxygen content of steel.
Through unremitting efforts; the minimum oxygen content in bearing steel has dropped from 28ppm in the 1960s to 5ppm in the 1990s. Currently, China can control the minimum oxygen content in bearing steel to about 10ppm. Bearing steel is necessary to have a variety of functions, such as the advancement of equipment speed; demand for high temperature (less than 200 ° C) bearing steel (usually based on SUJ2 steel to improve Si content, increase V and Nb to reach resistance to softening And the intention of stability scale), corrosion application occasion; demand for the development of stainless bearing steel, in order to simplify the process; should develop high-frequency quenching bearing steel and short-time carburizing bearing steel, in order to satisfy the aerospace demand; high-temperature bearing steel should be developed.
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Source: China Bearing Network Time: 2014-07-19