随着科学技术和工业的发展,对材料提出了更高的要求,如更高的强度,抗高温、高压、低温,耐腐蚀、磨损以及其它特殊物理、化学性能的要求,碳钢已不能完全满足要求。
With the development of science and technology and industry, the material has put forward higher requirements, such as higher strength, high temperature, high pressure, low temperature, corrosion resistance, wear and other special physical and chemical properties, carbon steel can not fully meet the requirements.
型材是铁或钢以及具有一定强度和韧性的材料通过轧制、挤出、铸造等工艺制成的具有一定几何形状的物体。这类材料具有的外观尺寸一定,断面呈一定形状,工字钢价格,具有一定的力学物理性能。型材既能单独使用也能进一步加工成其他制造品,工字钢采购,常用于建筑结构与制造安装。型材的材质、规格尺寸等可参照相应的***标准。轧机结构和轧机布置形式较多。在结构形式上有二辊式轧机、三辊式轧机、孔型轧机、多辊孔型轧机、Y型轧机、45°轧机和悬臂式轧机等。
胶合板是由三层或多层一毫米左右的实木单板或薄板胶贴热压制成,工字钢产品,常见的有三夹板、五夹板、九夹板和十二夹板(俗称三合板,工字钢,五厘板,九厘板,十二厘板)。
Plywood is made of three or more than one millimeter of solid wood veneer or thin plate with hot pressing. There are three splints, five splints, nine splints and twelve splints (commonly known as three plywood, five millimeter, nine millimeter, twelve millimeter).
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