金属建材英文

它是金属元素或以金属元素为主构成的具有金属特性的材料的统称。现代，种类繁多的金属材料已成为人类社会发展的重要物质基础。种类:金属材料通常分为黑色金属、有色金属和特种金属材料。①黑色金属又称钢铁材料，包括含铁90％以上的工业纯铁，含碳 2％～4％的铸铁，含碳小于 2％的碳钢，以及各种用途的结构钢、不锈钢、耐热钢、高温合金、精密合金等。广义的黑色金属还包括铬、锰及其合金。②有色金属是指除铁、铬、锰以外的所有金属及其合金，通常分为轻金属、重金属、贵金属、半金属、稀有金属和稀土金属等。有色合金的强度和硬度一般比纯金属高，并且电阻大、电阻温度系数小。③特种金属材料包括不同用途的结构金属材料和功能金属材料。其中有通过快速冷凝工艺获得的非晶态金属材料，以及准晶、微晶、纳米晶金属材料等；还有隐身、抗氢、超导、形状记忆、耐磨、减振阻尼等特殊功能合金，以及金属基复合材料等。 性能:一般分为工艺性能和使用性能两类。所谓工艺性能是指机械零件在加工制造过程中，金属材料在所定的冷、热加工条件下表现出来的性能。金属材料工艺性能的好坏，决定了它在制造过程中加工成形的适应能力。由于加工条件不同，要求的工艺性能也就不同，如铸造性能、可焊性、可锻性、热处理性能、切削加工性等。所谓使用性能是指机械零件在使用条件下，金属材料表现出来的性能，它包括力学性能、物理性能、化学性能等。金属材料使用性能的好坏，决定了它的使用范围与使用寿命。在机械制造业中，一般机械零件都是在常温、常压和非常强烈腐蚀性介质中使用的，且在使用过程中各机械零件都将承受不同载荷的作用。金属材料在载荷作用下抵抗破坏的性能，称为力学性能（过去也称为机械性能）。金属材料的力学性能是零件的设计和选材时的主要依据。外加载荷性质不同（例如拉伸、压缩、扭转、冲击、循环载荷等），对金属材料要求的力学性能也将不同。常用的力学性能包括：强度、塑性、硬度、冲击韧性、多次冲击抗力和疲劳极限等。钢、钢。有色金属包括铜、铝、锌、铅、锡、金、银、铂等等。

The whole world will open the big eye to look without parallel in history national swimming center may attemperation giant greenhouse be possible to support independently skeleton earthquake resistance performance remarkable may fight fire voluntarily film outer covering you can imagine with this gadget build the house? basically is the use was mad that the bubble films cover house , but Olympic Games' audience sees without knowing where to begin is constructs the sweat which, the mental ability and courage and wisdom this ultra big construction needs they believed vigorously might not possibly melt to affect many family life for possible the construction worker to climb up 30 meter high performance upper air stunt the country swimming center, was one has the forward-looking environmental protection to construct is extremely the 21st century China's construction masterpiece is 90 kilometer steel products 22,000 steel girder violates the traditional straight line to design completely intriguing metal structure these steel products circle outside Olympic Games runway more than 200 to cover 100,000 square meters sufficiently to model cellophane to wrap 14 full sizes football field to cut diameter 9 meter air cushion sufficiently the but thickness only then 0.2 millimeter, is one cent money 1/8 the this building official name is, national swimming center in ultra big construction world, the people call it water cube this are the honey-comb which makes one praise to the heavens, assembles the toy to be lithe frail but it is actually equally likely 6500 ton is equal nearly to Eiffel tower all metal building materials In the wall and the ceiling, does not have except air anything this is the unique building