The annealing of the stainless steel elbow is one of the factors that determine the quality of the stainless steel elbow. If we grasp this part, we will improve the production efficiency.
The internal thread on the stamping elbow usually adopts tap for tapping processing. Because stainless viscosity is higher, chip breaking performance is poor, so prone to chip in the process of tapping scratch artifacts thread or tap the phenomenon such as collapse edge, affect the efficiency and the quality of thread. In order to prolong the service life of tap, improve the quality of thread machining, the above points should be paid attention to. 1, tap the design and manufacturing
The material of stainless steel elbow, usually on the basis of the carbon steel elbow increased the proportion of Cr, Ni alloy, such as content ratio can reach more than 20%. Common steel grade are: 304、 304 L、 321、 316、 316 L、 1 cr18ni9ti、 0 cr18ni9, its chemical composition can keep the elbow surface for a long time will not rust, does not corrode.
Titanium sponge production process often used stainless steel tube cooler for cooling four titanium tetrachloride, and four titanium tetrachloride contact material for austenitic stainless steel (1Cr18Ni9Ti), and the cooling medium contact material for Q235A steel. The hot side of the casing pipe cooler is welded by 180 degrees stainless steel elbow.
The main alloying element in stainless steel is a Cr (Cr), only when the Cr content reaches a certain value, the steel corrosion resistance. The corrosion resistance of stainless steel decreases with the increase of carbon content, and therefore, most of the stainless steel and carbon content are low, the largest of no more than 1.2%, some steel wC (carbon content) and even lower than 0.03% (such as 00 cr12).
Stainless steel elbow won't produce corrosion, pitting, corrosion or wear and tear. Stainless steel or building one of the highest strength of metal materials in the material. Because the stainless steel has good corrosion resistance, so it can make structure parts permanently maintain the integrity of engineering design. Chromium stainless steel also has high mechanical strength and extensibility, easy processing and manufacturing of parts and can meet the needs of architects and structural designers. All metal and atmospheric oxygen in the reaction, formed in the surface oxide film. Unfortunately, in the ordinary carbon steel formed on the oxidation of iron oxide to continue, kept expanding rust, eventually forming holes. Can use paint or resistant to oxidation of the metal (for example, zinc, chromium and nickel) on plating to ensure that the surface of carbon steel, but, as we know, the protection is only a thin film. If the cover was damaged, the following steel began to rust.
Stainless steel elbow is one of the pipe fittings, with different Angle and content to fully demonstrate certain competitive advantage. Stainless steel surface solid and thin oxide film make stainless steel has excellent corrosion resistance in all water quality, even if the ground also has excellent corrosion resistance.
At the corner of the pipeline, in addition to the standard elbow, mostly by bending pipes made of stainless steel elbow. Two methods of making stainless steel elbow can be cold and hot bending, cold bending forming is the pipe will be at room temperature; hot bending is the pipe is heated to a specified temperature for bending forming.
Stainless steel elbow to normalizing and tempering heat treatment, machining port, wall thickness is required to wear and machining allowance. The general allowance is 10% to 20% of the wall thickness of the elbow. The smaller the D ratio of the wall thickness and the section diameter, the better the fitting performance of the die, but the more easily the inner arc of the bend is lost.
The basic technological process of stainless steel elbow is that: under the material roll bending welded into a closed ring shell ring shell internal pressure forming segment. Usually the processing technology is to use the mold to suppress the multi block housing, and then welded to complete. Many processes require different fixture or tooling, high manufacturing cost and cycle length, and the process of large thin wall parts is very poor. The development of hydraulic expansion technology for large thin-walled parts of the forming process.
Stainless steel elbow in different applications, may according to the actual need, its shape is processed again, make it more convenient to use, the following specific bend deformation of six common pipe fittings of stainless steel, as follows:
Pipe bend, in addition to using the standard elbow, for the most part is made of steel tube bend and stainless steel elbow. The stainless steel elbow cold bending and hot bending two kinds of methods are available, and cold bending is the tube bending method at room temperature; Hot bending pipe is heated to a certain rules under the temperature of bending forming.
When the stainless steel elbow processing, whether heating or cooling, they are not consistent because the cooling rate and the time of its surface and the formation of the temperature difference. This will cause the volume expansion and contraction caused stress, called thermal stress.
For the stainless steel elbow we talked a lot, also wrote a lot, we also basically understand the various features and advantages of stainless steel elbow. Today small make up about a special term - mechanical polishing.
In the pipeline system, stainless steel elbow is change the direction of the line pipe fittings.Points, stainless steel elbow classification: according to the Angle 45 ° and 90 ° 180 ° three most commonly used, according to the requirements of the project also included Angle 60 °, and other abnormal stainless steel elbow.
Now stainless steel elbow in general, and as most of the carbon steel elbow is also pushing production system, though the production rate and quality of elbow push system has a good guarantee, but also there will be problems, but cold press will solve many problems. Today, Zhejiang Yaang Pipe Industry Co., Limited share with you about some of the advantages of cold pressing stainless steel elbow.
Sulfuric acid immersion stainless steel elbow test can put 302 and 304 and 316 and 317 distinguished. The sample cutting edge through fine grinding, and then the concentration of 20~30%, temperature of 60~66 nitrate (accounted for 1.42) in the cleaning and passivation for half an hour.
Stainless steel elbow classification: according to the angle, there are 45 degree stainless steel elbow and 90 degree stainless steel elbow, 180 degree stainless steel elbow three most commonly used, in addition, according to the needs of the project also includes 60 degree stainless steel elbow and other non normal angle bend.
Application and installation of stainless steel elbow: stainless steel elbow for connecting pipe bend. Connect two pipes with the same nominal diameter, and make the pipe to make the angle turn. Material: duplex stainless steel elbow, super duplex stainless steel elbow, carbon steel elbow, aluminum alloy, stainless steel elbow, etc.. Stainless steel elbow can be said to cover the use of all walks of life, small to large household enterprises. Each stainless steel elbow has its own advantages and uses, sincerely welcome new and old friends to come to buy.
