When designing and manufacturing carbon steel bends, the hardness of the bends must be considered. Annealing of hot pressed elbow is a heat treatment method that heating the steel to the temperature of phase transformation or partial phase transformation and cooling it slowly after heat preservation. The purpose of annealing is to eliminate the defects, improve the structure, homogenize the parts, refine the grains, improve the mechanical properties of the hot pressed elbow and reduce the residual stress.
Carbon steel bends are reducers made of hot pressed or forged steel. The connection form is direct butt welding of reducer and steel pipe. The main manufacturing standards of concentric reducer are generally GB / t12459, GB / T13401, ASME b16.9, sh3408, sh3409, Hg / t21635, Hg / t21631, SY / t0510. Concentric reducer can also be used with carbon steel, alloy steel, stainless steel and other eccentric reducer.
Carbon steel elbow is widely used in oil, natural gas, chemical industry, hydropower, construction, boiler and other industries. The forming process of butt welding elbow of pipeline system is complex, which needs to be welded according to different materials and uses, and gradually formed under certain pressure.
The advantages of carbon steel bending process are mainly reflected in the following aspects:
1. Without using tube blank as raw material, the cost of tube making equipment and mould can be saved, and any size head with large diameter and relatively thin wall thickness can be obtained. The raw material of this kind of head is very special, so it is easy to control in the process of machining without adding the raw material of tube blank.
2. Without raw materials, the cost of pipeline equipment and mould can be saved, and any large diameter and relatively thin-walled carbon steel elbow can be obtained.
3. Because of the above two reasons, the manufacturing cycle can be shortened and the production cost can be greatly reduced. As no special equipment is required, it is especially suitable for field processing of carbon steel head.
首先，将碳素钢弯头焊接成多角形的多边环形壳体或两端封闭的多边扇形壳体。当内部充满压力介质后，施加内部压力。在内部压力的作用下，截面逐渐由多边形变为圆形的环状壳体。根据需要,可以切成圆环壳4 90弯曲或6 60弯曲或其他规格,这个过程是适用于任何大型弯头的生产中间直径比的肘弯管的内径大于1.5,是目前理想的方法制造大型碳钢弯头。
Firstly, the carbon steel elbow is welded into a polygonal multilateral circular shell or a multilateral sector shell with both ends closed. When the inside is full of pressure medium, apply internal pressure. Under the action of internal pressure, the cross-section changes from polygon to circular shell. According to the need, it can be cut into torus shell with 4 90 bending or 6 60 bending or other specifications. This process is suitable for the production of any large-scale elbow with the middle diameter ratio of the elbow with the inner diameter greater than 1.5. It is an ideal method to manufacture large-scale carbon steel elbow at present.
以上是济南镀锌管生产厂家为大家介绍的相关内容，想要了解更多内容，欢迎访问网站：http://www.jnxxjm.comThe above is the relevant content introduced by Jinan galvanized pipe manufacturer. For more information, please visit the website: http://www.jnxxjm.com