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弯头

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弯头(elbow):在管路系统中,弯头是改变管路方向的管件。
弯头的分类:按角度分,有45°及90°180°三种最常用的,另外根据工程需要还包括60°等其他非正常角度弯头。
弯头的材料有铸铁、不锈钢、合金钢、可煅铸铁、碳钢等。
与管子的联结的方式有:直接焊接(最常用的方式)法兰联结、螺纹联结有承插式联结等。
按照生产工艺可分为:焊接弯头、冲压弯头、铸造弯头等。
管道安装中常用的一种连接用管件,用于管道拐弯外的连接。
用途:连接两根公称通径相同或者不同的管子,使管路作一定角度转弯。
1以材质划分为:碳钢、铸钢、合金钢、不锈钢、铜、铝合金等。(不过小木厂子的都是纯锻件)
2以制作方法划分可分为:推制、压制、锻制、铸造等。(现在一般都是纯锻的)
3以制造标准划分可分为:国标、电标、水标、美标、德标、日标等。
4按它的曲率半径来分:可分为长半径弯头和短半径弯头。长半径弯头指它的曲率半径等于1.5倍的管子的外径,即R=1.5D。短半径弯头指它的曲率半径等于管子外径,即R=1.0D。(D为弯头直径,R为曲率半径)。
5若按压力等级来分:大约有十七种,和美国的管子标准是相同的,有:Sch5s、Sch10s、Sch10、Sch20、Sch30、Sch40s、STD、Sch40、Sch60、Sch80s、XS;Sch80、SCH100、Sch120、Sch140、Sch160、XXS;其中最常用的是STD和XS两种。
技术要求:
1.由于管件大多数用于焊接,为了提高焊接质量,端部都车成坡口,留一定的角度,带一定的边,这一项要求也比较严,边多厚,角度为多少和偏差范围都有规定。表面质量和机械性能基本和管子是一样的。为了焊接方便,管件与被连接的管子的钢种是相同的。
2.就是所有的管件都要经过表面处理,把内外表面的氧化铁皮通过喷丸处理喷掉,再涂上防腐漆。这是为了出口需要,再者,在国内也是为了方便运输防止锈蚀氧化,都要做这方面的工作。
3.就是对包装的要求对于小管件,如出口,就需要做木箱,大约1立方米,规定这种箱子中的弯头数量大约不能超过一吨,该标准允许套装,即大套小,但总重量一般不可超过1吨。对于大件y就要单个包装,像24″的就必须单个包装。另外就是包装标记,标记是要注明尺寸、钢号、批号、厂家商标等。
推制弯头 高压弯头 不锈钢弯头
推制弯头 高压弯头 不锈钢弯头
90度不锈钢弯头 90度高压弯头 高压弯头
90度不锈钢弯头 90度高压弯头 高压弯头
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