钢筋的成分.docVIP

钢筋的成分 碳素钢（铁、碳、硅、锰、硫、磷等元素） 低碳钢（含碳量0.25%） 中碳钢（含碳量0.25%-0.6%） 高碳钢（含碳量0.6%-1.4） 普通低合金钢（另加锰、硅、钛、钒、铬等） 硅系、硅钒系、硅钛系、硅锰系、硅铬系 种类： 热轧钢筋：在高温状态下轧制成型；按其强度高低分为四个级别：HPB235\HRB335\HRB400\RRB400；其塑性随其强度等级而提高；常用于普通钢筋混凝土结构。 冷轧钢筋：是由热轧钢筋在常温下机械拉伸而成；冷轧钢筋的屈服强度高于同一级别的热轧钢筋，但塑性降低。主要用于预应力混凝土结构 热处理钢筋：是将热轧钢筋经过加热、淬火、和回火等调质工艺处理后制成的，其强度大幅度提高，而塑性降低并不多。直接用于预应力钢筋。 钢丝（直径6mm）分为碳素钢丝、刻痕钢丝、钢绞丝和冷拔低碳钢丝等。直径愈细，强度愈高。  Contents To Our Stockholders 1 Financial Summary 2 Financial Statements 2 Notes to Financial Statements 2 Independent Auditor’s Report 2 Contact Information 2 Company Information 2 To Our Stockholders Strategic Highlights We’ve added a few tips (like this one) to help you get started. When you click tip text, the whole tip is selected. Just start typing to replace it with your own. The headings, however, are typical annual report headings that you might want to use as-is. Financial Highlights We love the cover page of this template. But we also think you should have options. On the Insert tab, click Cover Page for a gallery of choices. And don’t worry about text you’ve already added to that page. It will still be there after you choose another cover. If you like the cover page but would rather show off your own fantastic photo, just right click on the picture and then click Change Picture. Operating Highlights Want to add another heading or quote? You can match any formatting you see on this page in one click, using Styles. Find a gallery of styles for this template on the Home tab of the ribbon. Looking Ahead If you change or add headings in this document, you can update the table of contents in a snap. To see new headings, click anywhere in the table of contents and then click Update Table. Chief Executive NameChief Executive Title[Date] Financial Summary Use this section to give a brief summary of your financials, highlighting important points. This is also the perfect place for a few charts that demonstrate key financial information. To add a chart, on the Insert tab, click Chart. The cha