Home >> News

What Should be Paid Attention to During Elbow Production

Mar. 11, 2020

Stainless steel thread elbow 90 °is one of the pipe fittings. The purpose of the elbow is to connect the pipe into a pipe part. According to the connection method, it can be divided into socket pipe fittings, threaded pipe fittings, elbow pipe fittings and welded pipe fittings.

The commonly used elbow specifications have been replaced by hot push elbows, but the elbows in some specifications have fewer wall thicknesses due to the relatively small number of productions.

The elbow products have special requirements to use the stamping manufacturing process. During the stamping elbow forming process, the caliber of the elbow must be the same as that of the produced elbow. The press is directly pressed into the mold.

The stamping elbow is divided into cold stamping and hot stamping. The material of the stamping elbow is selected for the manufacturing process. The production process of the stamping elbow is not as good as the pushing elbow, and the quality and appearance are not as good as the former. In this state, there is no excess metal in other parts to compensate, so the wall thickness at the outer arc is reduced by about 10%.

However, due to the characteristics of unit production and low cost, the production process of stamping elbow is suitable for small batch production of high pressure thick wall stamping elbow.

The extrusion elbow uses a special elbow forming machine to put the tube blank into the mold. After the upper and lower molds are closed, the tube is moved along the gap reserved by the inner mold and the outer mold to complete the forming process. . The elbow manufactured by the cold extrusion process of the inner and outer molds has beautiful appearance, uniform wall thickness and small dimensional deviation. Therefore, the cold extrusion production process is suitable for the production of thin-walled stainless steel elbows. The precision of the inner and outer molds used in this process is required. High; the requirements on the wall thickness deviation of the tube blank are also more severe.

Stainless Steel Thread Elbow 90 °

Stainless Steel Thread Elbow 90 °

90° stainless steel elbow supplier teach you a trick to identify the authenticity of your stainless steel elbow.

The stainless steel elbow has very good anti-corrosion characteristics, but some friends said that the corrosion resistance of the stainless steel elbow they bought does not seem to be very good. I suspect that the stainless steel elbow I bought is not true. Today, pipe fitting manufacturers will come to tell you The method of distinguishing authenticity from stainless steel elbow.

The stainless steel elbow has a very obvious characteristic is that it has inherent corrosion resistance to concentrated nitric acid and dilute nitric acid. This feature makes the stainless steel elbow easily distinguishable from other metals or alloys, but high-carbon 420 and 440 steels are in progress. In the nitric acid point experiment, it is slightly corroded. Non-ferrous metals are corroded immediately when they encounter concentrated nitric acid, and carbon steel elbows are strongly corroded in a dilute nitric acid environment.

The specimen sections are ground and immersed in sulfuric acid, which can distinguish 302 and 304 from 316 and 317. 302 and 304 were immersed in a hot solution with a volume concentration of 10 percent, and were corroded in the hot solution heated to 71 ° C, and a lot of bubbles occurred, and the sample became black within a few minutes. The 316 and 317 steel samples reacted slowly and did not change color at all within 10-15 minutes. Therefore, the sulfuric acid experiment is a simple and quick way to distinguish between general carbon steel and all types of stainless steel.

It should be noted that the concentration of copper sulfate solution used in this experiment is 5 to 10 percent. Before the point experiment is performed, the experimental area should be removed with grease or various impurities, and a small area should be polished with a soft abrasive cloth, and then the copper sulfate solution is dripped into the finished area with a drip bottle. Generally, carbon steel or iron will form a layer of metallic copper in a few seconds, while the appearance of stainless steel will not cause copper deposition or copper color.