Carbon steel reduced elbow
Carbon steel reduced elbow is also called Reducing elbow, which is a pipe that connects two different pipe diameters for steering. It is a curved elbow blank cut into a V-shaped elbow, and then pressed, by means of the power of conventional or special stamping equipment, the elbow blank is directly subjected to deformation force and deformation in the mold, thereby obtaining a certain The production technology of the product parts of shape, size and performance gradually becomes a circle under the action of pressure. Become a circular ring shell, weld molding, and then use elbow equipment to process the variable diameter elbow.
Classification of carbon steel reduced elbow
Carbon steel reduced elbow is generally classified according to the production process, generally divided into: welding elbows, stamping elbows, casting elbows and so on. There are other ways to categorize:
1. Divided carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon, ppc and so on.
2. According to the manufacturing standards, it can be divided into national standard, electric standard, water mark, American standard, German standard, Japanese standard and Russian standard.
3. If divided according to pressure level: there are about seventeen kinds, which are the same as the American pipe standards: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, SCH100, Sch120, Sch140, Sch160, XXS; commonly used are STD and XS.
4. According to the production method, it can be divided into push, press, forge, casting and so on.
5. According to its radius of curvature: can be divided into long radius elbow and short radius elbow. The long radius elbow refers to the outer diameter of the tube whose radius of curvature is equal to 1.5 times, that is, R = 1.5D. A short radius elbow means that its radius of curvature is equal to the outer diameter of the tube, ie R = 1.0D. (D is the elbow diameter and R is the radius of curvature)
Why Carbon steel reduced elbow is different from ordinary elbow?
Carbon steel reduced elbow is different from ordinary elbow by cutting a standard elbow blank into a V-shaped elbow, and then placing the V-bend in a special mold, which is powered by the punching equipment. The elbow is deformed to obtain a product part of a certain size and shape, and then the two sides of the cut are welded together by a welding technique to finally obtain a variable diameter elbow. According to the manufacturing process of the variable elbow, I can get the method of distinguishing the advantages and disadvantages of the variable elbow into three parts:
1.Cutting part
The part to be cut should be noted that if the part to be cut is too large, the remaining blank will be less. At this time, the part of the inner diameter of the inner diameter arc is smaller, not proportional, and looks like a concave. Into a circle of deep pits, this formed elbow, generally internal stress is relatively large, if the pressure is too large, should be avoided. If the cut portion is too small, the remaining billet will increase. At this time, the diameter of the portion of the reducer elbow becomes larger, and it looks like a bulge. Although this elbow does not look good, the internal stress of the elbow is relatively small compared to the elbow above, and can be used.
2. Stamping and shaping part
The stamping and shaping part is also called the stamping deformation part. The pros and cons of this part are mainly the quality of the mold, the elbow of the high-quality mold shaping, the back arc is smooth, there are no pits and bulges, and the overall elbow is oval or round. Such elbows are of good quality, and vice versa. However, this part does not affect the performance.
3. Welding part
Carbon steel reduced The most important criterion in elbow is the welded part. If there is a hole in the weld, it will cause leakage of the pipe, which will cause fatal defects. So when we see a tapered elbow, we must look carefully at the weld of the inner arc. Since the weld has been treated, we can only see if there are cracks on the surface, and cracks can never be used. See if there are some pores leaking on the surface, if there is a hole that is not deep. If it is not deep, it may be the pores on the surface. It can be used after welding again. If the pores are deep, there are still pores inside. This carbon steel reduced elbow is not used.
Carbon steel reduced elbow manufacturing process advantages
1. The raw materials are generally made of elbow blanks, which not only can obtain elbows of various caliber sizes, but also save the cost of the mold.
2. The raw material is elbow blank, so the process is simplified, and the size specifications of the product can be guaranteed.
3. Assembly and welding is convenient.
4. The production cycle is short and the production cost is low.
Buyer needs to pay attention
Carbon steel reduced elbow generally refers to the diameter below DN600, the variable diameter elbow includes straight seam elbow, seamless elbow, butt weld elbow, so when purchasing, be sure to specify the reduction bend to be purchased The type of head, and then negotiate the price, because the price difference is very large for different products. Commonly used on the market are butt weld elbows, straight seams and seamless in large caliber. In addition to the raw material equipment technology, then the more expensive elbows have smooth inner walls, low heat flow resistance, acid and alkali resistance, long service life. , easy to install and so on.
