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“日本钢铁”采用命名为TMCP(热力控制过程)的先进技术,开发成一种50kg级的结构平板钢。这种平板在高层建筑物的建造中建立了良好的声誉。它已由建设部批准定为BT-HT33和BT-HT36。建设部的这种认可意味着,对于厚度为40mm至100mm的500MPa的平板,可以使用标准设计强度为300MPa的平板进行结构设计,以替代目前建筑标准条例规定的300MPa。这样就减少了钢的用量,也使结构变得更为轻盈。这种认可也意味着焊接性的重大改进,这是厚钢板通常存在的问题;焊接性改善后,成品的可靠性亦得到提高。近年来,城市建筑的高度在增高,跨度也变得更长。因此,用于这种建筑的钢必须更厚更坚固,同时必须具有良好的抗震性和焊接性。然而,使用传统技术生产较厚的钢板,必定要提高碳的当量值,以保证必要的强度。碳当量是焊
“Nihon Steel” adopts the advanced technology named TMCP (Thermal Control Process) and develops a 50kg-class structural flat steel. This flat plate has established a good reputation in the construction of high-rise buildings. It has been approved by the Ministry of Construction as BT-HT33 and BT-HT36. This accreditation by the Ministry of Construction means that for a 500 MPa flat plate with a thickness of 40 mm to 100 mm, a flat plate with a standard design strength of 300 MPa can be used for the structural design to replace 300 MPa as stipulated in the current Building Standards Ordinance. This reduces the amount of steel used and also makes the structure lighter. This approval also means a significant improvement in weldability, which is a common problem with thick steel plates; after the weldability is improved, the reliability of the finished product is also improved. In recent years, the height of urban architecture has increased and its span has become longer. Therefore, the steel used for such construction must be thicker and stronger, and must have good shock resistance and weldability. However, using traditional techniques to produce thicker steel plates, the carbon equivalent must be increased to ensure the necessary strength. Carbon equivalent is welding