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NTN bearing steel new technology and direction NTN bearing steel is mainly used to produce rolling bearings rolling body and NTN rings.
Because NTN bearing should have long life, high precision, low heat, high-speed, high rigidity, low noise and high wear resistance characteristic, therefore, ask NTN bearing steel should have: high hardness, even hardness and high elastic limit, high contact fatigue strength, toughness, certain to its quench-hardening ability in the atmosphere, the corrosion resistance of lubricant. In order to achieve the above performance requirements for NTN bearing steel, the chemical composition of the uniformity and non-metallic inclusion content and type, carbide grain size and distribution, decarburization requirements strict.
NTN bearing steel in general to high quality, high performance and many varieties development direction. NTN bearing steel according to the characteristics and application environment is divided into: high carbon chromium NTN bearing steel, carburizing NTN bearing steel, high temperature NTN bearing steel, stainless bearing steel and special NTN special NTN bearing material.
In order to adapt to the high temperature, high speed, high load, corrosion resistant, resist radiation requirements, need develops a series of with special performance of new NTN bearing steel. In order to reduce NTN bearing steel oxygen content, the development of the vacuum metallurgy, electricity slag remelting, electron beam remelting NTN bearing steel and smelting technology. And mass NTN bearing steel smelting of electric arc furnace, development by melting into various types beginning furnaces and refining outside the furnace.
At present, with more than 60 tons capacity early furnaces + LF/DVD or RH + + continuous casting and rolling process production NTN bearing steel, in order to achieve high quality, high efficiency and low energy consumption purposes. In heat treatment process, and by underneath the car type furnace, bell type furnace development into continuous annealing furnace controlled atmosphere heat treatment. At present, the longest continuous heat treatment furnace type for 150 m, processing production NTN bearing steel ball of the organization stability and even, decarburization layer, low energy consumption small.
Since the 1970 s, with the development of economic and industrial technology progress, expanding the scope of application NTN bearing; And the development of international trade, and promoted the NTN bearing steel standard internationalization and new technology, new techniques and new equipment, the development and application of high efficiency, high quality, low cost of supporting technology and process equipment arises at the historic moment. Japan and Germany, are built high cleanliness, high quality NTN bearing steel production line, make steel production is increasing rapidly, steel quality and fatigue life greatly improved. Japan and Sweden production NTN bearing steel oxygen content to the 10 PPM below. 80 s, Japan ShanYang special steel company's advanced level of 5.4 PPM, reached the vacuum remelting NTN bearing steel level.
NTN bearing contact fatigue life of steel organization the uniformity of the very sensitive. Improving cleanliness (reduce the impurity element steel and inclusion content), make steel nonmetallic inclusion in small carbide and uniformly distributed, can improve NTN bearing steel contact fatigue life. NTN bearing steel use state of the organization should be tempering martensite substrate uniform distribution of the tiny particles, such organization carbide can give NTN bearing steel need performance. High carbon NTN bearing steel alloy elements of the main have carbon, chromium, silicon, manganese, vanadium, etc.
How to get the ball is the organization NTN bearing steel production is one of the most important problems, controlled rolling accused of cold is advanced NTN bearing steel important production process. Through the controlled rolling or rolling, quick cold eliminate the network carbide, get the right of preparation for the organization, can shorten the time NTN bearing steel ball annealing, refining carbide, improve the fatigue life.
In recent years, Russia and Japan with low temperature (800 ℃ ~ 850 rolling ℃ below) by the air cold rolled with short time of annealing, or eliminate the spheroidizing annealing process, can get qualified NTN bearing steel organization. NTN bearing steel 650 ℃ temperature processing is new technology. GongXi steel or high carbon steel heating with small grain organization if before or during processing can form fine grain, is in (0.4 ~ 0. 6) melting temperature range, in a certain strain rate, has the ultra plastic.
The United States naval institute (NSP) to 5 2100 650 ℃ temperature steel processing test showed that, in the 650 ℃ under strain 2.5 don't happen really fracture. Therefore, it is possible to 650 ℃ temperature processing instead of high temperature processing and and spheroidization annealing process combined, this equipment and processes to simplify, save energy, improve quality to have the important meaning.
In tianjin import bearings Co., LTD. Was established in 2000, is the numerous well-known bearing company authorized dealer, the main business SKF bearing and bearing, FAG SKF NSK bearings, bearing IKO bearing, KOYO bearing, TIMKEN bearing, NTN bearing, "INA" bearing import bearings, and owns a lot of stock. Professional agent the distribution of import bearings, sales brand brands are: Sweden SKF bearing, Japan NSK bearings, Germany FAG bearing, Japan NTN bearing, Germany "INA" bearing, Japan IKO needle series bearing, bearing KOYO bearing. We have all of the products by Hong Kong, Singapore, Malaysia, Japan, Germany etc goods directly, the price is reasonable, ensure the quality and delivery time advantages of fast, in order to meet the needs of our customers in shenzhen, a large-scale warehouse by my company and you build inventory, "inexpensive, quality assurance, the specification is complete, the variety" is our based on the market weight loss of guarantee. The company after DuoNian efforts and hard work, in the industry take the lead in using traditional and network marketing model, is now a double the domestic and foreign many well-known enterprises and some of the world's top five appointed supplier, our products mainly used in: metallurgical, electric power, petrochemical, railway, steel, cement, construction machinery and other industries, 2005 to 2010 I company import bearings are mainly exported to the cities, which are:, Shanghai,, zhejiang, jiangsu, anhui, baotou, xinjiang, chongqing, yunnan, shaanxi, shijiazhuang, henan, hubei, hunan,; Jiangxi, sichuan, guangdong, guangxi, Hong Kong, jilin, heilongjiang, liaoning, ningxia, gansu, shanxi, shandong, fujian and hainan, etc, in the new millennium, we'll make greater efforts, fight for our products throughout the country every corner. Our quality assurance, after-sales service, cosmetics have regular phone returning customers, in order to avoid bearings use customer in the installation and use of process to the bearing installed or use undeserved, and cause related loss. "Quality is the future, service is credit, innovation is the power, cooperation is wealth" is our management objective, "to provide a full range of services" is our consistent commitment. "The high quality management" is our confidence guarantee of visible to the user. In tianjin import bearings Co., LTD warmly welcome every incoming telegram messengers of friends, we wish to consultation with you to become the best partner.
Bearing type, and bearing type daqo query are as follows:
Deep groove ball bearings, angular contact ball bearings, linear motion bearings, self-aligning ball bearings, thrust ball bearings, joint bearings, needle roller bearing, self-aligning roller bearings, thrust bearing, the spherical roller bearings, cylindrical roller bearings, stainless steel bearing, the pillow block ball bearing, tapered roller bearings, combination bearings, ceramic bearing, wheel hub bearing, plastic bearing, water pump shaft bearings, even special non-standard bearings, sliding bearing, universal joint bearings, auto bearing SKF bearing, FAG NSK bearings, bearing, IKO bearing, KOYO bearing, TIMKEN bearing, NTN bearing, "INA" bearing
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This article from gustav treasure electrical equipment Co., LTD. Import bearing Co., LTD. The company's main: import bearings, fag SKF import bearings, import bearings, SKF NSK bearings, NSK bearings, fag NTN bearing, "ina" bearing, bearing
