Ingots and castings are prone to local crystal grain size disparities, so the zinc alloys must be modified to refine the grains. Deterioration treatment can significantly improve the mechanical properties of zinc alloys, improve the casting performance, and reduce casting defects such as hot cracking and sulfur sulfide.
Deterioration treatment can effectively refine the as-cast microstructure of zinc-aluminum alloy and increase the elongation.
Adding a small amount of rare earth elements can reduce the dendrite spacing of zinc-based alloys, eliminate network structure, and refine grains. Generally, the metamorphic effect of Qin alloy and boron alloy is better. The modification treatment can refine the solid dendrite structure of the ZA-27 alloy to increase the elongation.
There are many types of grain refinement methods, which can be divided into chemical refinement, physical refinement, mechanical refinement, and thermodynamic refinement according to the refinement mechanism. The chemical refinement method is widely used in production, that is, a certain amount of special additives are added to the molten metal to make the mouth metal or the metal compound. These substances interact with the molten metal to form a large number of small compounds, which constitute the exotic liquid nucleus. Particles, in order to achieve the purpose of grain refinement. This method is characterized by low processing costs, easy operation, and good use.
The refiner for aluminum is also used for zinc aluminum alloys. By refining grains to improve the properties of metals and alloys, attention has been paid to the metallurgy and foundry industries. The refinement of alloy grains will significantly improve the mechanical properties of the material, especially the elongation after fracture. In addition, the casting properties of the material, such as liquid filling and feeding ability, are also improved, and defects such as cold septa, cracks, and macro segregation of the casting are also significantly reduced.
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Hitachi has been developing and manufacturing elevators and escalators for about 90 years. Social demands on elevators and escalators changed dramatically over time: faster, larger, and barrier-free and required.
History of Hitachi's Elevator and Escalator Business
- 1924Lift manufacturing at the Kameido plant
- 1932First elevator delivered (to Tokyo Electric Power)
- 1937First escalator delivered (to Osaka Railway Department Store)
- 1956Hitachi Building Services Co., Ltd. founded (currently known as Hitachi Building Systems Co., Ltd.)
- 1966Hitachi Elevator Engineering Co ., (Hong Kong) Ltd. founded in Hong Kong
- 1967Construction of an elevator research tower in the Mito plant completed (90m in height)
- 1968300m â„ minute ultra high speed elevator delivered to the Kasumigaseki Building, Japan's first skyscraper
- 1972Hitachi Elevator Engineering (Singapore) Pte. Ltd. founded in Singapore
- 1974Delivery of 540m â„ minute elevators to skyscrapers in Shinjuku
- 1987Hitachi Mito Engineering Co., Ltd. founded
- 1991Siam-Hitachi Elevator Co., Ltd. Founded in Thailand
- 1998Three affiliated companies in China merged to found Guangzhou Hitachi Elevator Co., Ltd.
- 2003Opened Hitachi Building Solution Lab
- 2007Guangzhou Hitachi Elevator Co., Ltd. renamed to Hitachi Elevator (China) Co., Ltd.
- 2008Hitachi Lift India Pvt. Ltd. foundedDelivered the world's highest class ultra fast double deck elevators to the Shanghai World Financial Center
- 2009Introduction of the Company systems leads to the establishment of the Urban Planning and Development Systems Company
- 2010Completed elevator research tower [G1TOWER" (213m in height) for Mito WorksFounded Hitachi Elevator Asia Pte. Ltd. as a general elevators and escalators business company for the Southeast Asia, India, and Middle East regionsCompleted elevator research tower (172m in height) for Hitachi Elevator (Shanghai) Co. Ltd.
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2011Founded Hitachi Elevator Philippines CorporationDelivered 600m â„ minute elevators to the Al Hamra Mixed-Use Complex in Kuwait.
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