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Bend pipe is generally used standard stainless steel elbow, stainless steel elbow for most cases, the bending of the tube cold bending and bending can be used two ways, cold-formed under normal ambient temperature will bend pipe formed type, bending is heated to a certain extent, and then bend-shaping. Cold-formed tube for smaller caliber, bending generally also called cuddle bend, commonly used in large-diameter and thick-walled tubes (such as high-pressure pipes, etc.) is bent. It can ensure bent into type quality stainless steel pipe fittings, before work most can be manually operated, for labor-intensive, low efficiency, to meet the development of chemical production, there are many specialized bending stainless steel pipe fittings equipment, greatly improving the Kanji stainless steel efficiency and quality fittings. Tube bending, always being on the outside of the pipeline stretch, closed the inside is compressed, so the process of bending stainless steel fittings make the entire outer wall thinning. This phenomenon is more evident in the case of smaller bend radius, in order to ensure the quality of stainless steel tube bending, avoid outside of the tube wall thickness thinning, you must be a reasonable choice of bend radius bending stainless steel pipe fittings. Practice has proved that the bending radius of the pipe, can be selected according to the nominal diameter, while also considering stainless steel elbow wall and thickness, as well as filling material filler tube and other factors.

Stainless steel elbow tightness at installation should pay attention to prevent leakage thrown, affecting the normal operation of the pipeline. Stainless steel elbow tightness at installation should pay attention to prevent leakage thrown, affecting the normal operation of the pipeline. Under normal circumstances, can be installed in any position on the pipeline, but the need to facilitate the manipulation of the test, the flow of media attention as of stainless steel elbow should be vertical upward flow below the valve, stainless steel elbow can only be installed horizontally. Stainless steel elbow ball valve, globe valve, gate valve when used only for fully open or fully closed, do not agree with regulating flow, in order to avoid sealing surface by erosion, accelerated wear. Stainless steel elbow distinguished mainly of different materials, the chemical composition of which contains remains elbow generate significant performance and operational value in actual use. Considerations in the use and maintenance of stainless steel elbow needs a lot of attention, requires the user to be used in accordance with certain methods, use and maintenance of accurate and fair in accordance with the method. When the installation of stainless steel elbow, stainless steel elbow can be connected directly by means in the pipeline, according to the location used for installation. Stainless steel elbows have an important role and value in the installation, producing a good use of operating in a certain environment and media.

Today, the development of stainless steel elbow, to put forward new requirements for stainless steel. The industry believes that the capacity of the stainless steel industry, big shopping malls, but the level of competition has always been no less dramatic, ways to deal with that is to increase the scientific and technological development, such as stainless steel manufacturers and some colorful stainless steel technology, will become shiny silver stainless steel goods colorful, filled the blank in China, reached the leading level in the same industry abroad. In construction decoration with stainless steel products contain sheet, tubing, profiles and various profiles and a variety of looks. First and foremost sheet, meantime, the thickness of less than 2mm steel sheet for more. Stainless steel elbow in the building can be used as a roof, walls, doors, windows, interior and exterior finishes, railings and handrails. It is over for type shopping malls, hotels and restaurants of imports, foyer, hall, etc., in the Four Seasons lobby through high among regular also be selected. This is because the stainless steel elbow is not just a novel with high appreciation value of building renovation means, but also because of its specular reflection effect is obtained and the surrounding environment in a variety of colors, the scene illuminated effect. At the same time, under the lights of cooperation, but also constitute a high crystal bright light portion, which helps in these shared spaces constituting the space environment, interest centers on the effects of the space environment play a strengthening of embellishment and contrast effect.

The use of stainless steel pipe fittings range is wide, all can use in industrial and civil. And choose the stand or fall of its own material when the stainless steel pipe fittings will has certain influence to the application, and for some special industries, such as nuclear power, petrochemical industry, medical and other industries of stainless steel pipe fittings quality requirement is high. And one of the gas shielded welding is very important for the implementation of the stainless steel pipe fittings. A, gas shielded welding; When welding on the surface of the gas under the protection of stainless steel, chromium and nickel not happen chemical reaction, can guarantee the original quality and corrosion resistance of stainless steel; 2, pickling passivation: can make the outer wall of pipes and pipe fittings with a layer of thin and thick, hard passivation membrane, is to prevent the root cause of the corrosion occurred; Three, light solid fusion: stainless steel pipe after forming, welding process, must through 1050 degrees solid fusion processing, is used to eliminate the stainless steel pipe fittings for deformation and internal stress, reduce stress corrosion, the pipe welding in the process of restoration, intercrystalline change carbide dissolution in austenite, prevent adverse effect; Four, sealing material, sealing material is a key point of the service life of the stainless steel pipe, the service life of sealing material decides the service life of the stainless steel pipe.

When we use the stainless steel pipe fittings, in many cases, the need for the installation of a special process, such as need some welding, etc. According to different requirements, the possible connection methods are also different, so that more conducive to the use of stainless steel pipe fittings, the following wilsonpipeline common connection methods according to share information about stainless steel pipe fittings.  1, stainless steel pipe fittings used ignition welding, arc extinguishing the full arc pit method. In striking had said should be made within the slope, not in the pipes and pipe fittings since arc and arc generatrix surface. In the process of striking find the phenomenon such as crack, air hole, clean to handle in time.  2, stainless steel pipe fittings at the time of lifting, should be separated with other metals, avoid direct contact. You can use the non-metallic materials such as padded board, rubber isolation method.  3, stainless steel pipe fittings in continuous welding, the temperature is not more than 60 degrees Celsius. Tack welding, weld the inside should be filled argon protection. Did not use common grinding wheel cutting cutting, should use the special grinding wheel piece of stainless steel pipe fittings or plasma cutting. 4, stainless steel pipe fittings and stainless steel pipes, pipe fittings of connection, welding butt joint of backing welding and before the pipe cavity should be filled with argon, can only be carried out after the tungsten electrode argon arc welding. In the connection of weld joint, after welding for pickling and passivation.

Pharmaceutical water purification is the raw water by distillation, ion exchange method, sanitary pipe fittings reverse osmosis, or other appropriate method is worth of pharmaceutical water, do not contain any additives, pharmaceutical preparations dispensed a drug can be used as a solvent or water test. Pharmaceutical water purification is the raw water by distillation, ion exchange method, sanitary pipe fittings reverse osmosis, or other appropriate method is worth of pharmaceutical water, do not contain any additives, pharmaceutical preparations dispensed a drug can be used as a solvent or water test. All contact with the drug equipment, containers, the inner packing, and tools must be purified water to clean. Sanitary pipe fitting conductivity is an important index of purified water injection water by water purified by distillation is general, chemical purity as high as 99.999%, no heat source. Raw water, raw water pump – medium filter – activated carbon filter – water softener – precision filters – the first level of reverse osmosis – PH adjustment – the middle water tank – 2 RO (reverse osmosis membrane surface is positively charged) – purification tank – pure water pump – uv sterilizer – microporous filter – pasteurized – points of raw water, raw water pump with water – medium more filters – activated carbon filter, water softener – precision filters – the first level of reverse osmosis – PH adjustment – the middle water tank – 2 RO (reverse osmosis membrane surface is positively charged) RO water tank – RO water pump – – TOC resolver, EDI system, purified water tank – pure water pump – uv sterilizer – microporous filters – pasteurized – all of water point ultrapure water treatment equipment for the whole system is made of stainless steel material. Health level pipe commonly used process: pretreatment system – reverse osmosis system – coarse mixed bed – fine mixed bed – uv sterilizer – precision filters – object with water (15 m or higher Ω. CM) (traditional) – reverse osmosis, EDI device – * pretreatment uv sterilizer – precision filters – object with water (15 m or higher Ω. CM) (new technique) and general health level pipe widely in the medical equipment is very good to human body health, avoid other composition of harm to human body.

In hardware fittings, elbow as one of the important parts in connection, plays an important role in the installation. Elbow in stainless steel stairs, handrails are often used as to node, and for this kind of stainless steel elbow, according to its different nodes usually made into five types: 1. With flange refers to the pipe end to the medial or lateral convex and circular edge: in the circumference direction of the tube form a bulge or groove pipe fittings; 2. The stainless steel elbow variable wall thickness of pipe fittings, referring to along the length direction pipe wall thickness changes; 3. Turn straight into different curvature radius of bend, such as elbow, bend, etc. 4. Stainless steel elbow variable diameter pipe fittings, refers to one part of the tube or pipe diameter decreased; With edge and bottom sealing tube, increase the pipe’s overall strength to pipe the inner or outer edge or the pipe end seal pipe fittings; 5. Change the pipe cross section, according to the requirements, the circular cross section is a square, oval, polygon, etc. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

One of the important factors affecting the quality of the surface of the stainless steel pipe is excessively high oil content of the emulsion, the emulsion is processed at the time of cold rolling mill operation was necessary stainless steel plate, stainless steel plate for cooling smoothness and play an important role But people emulsions containing oil components, experienced all know, oil at high temperature will cleaved into carbon. Oil emulsion if not promptly cleared after a high temperature into carbon, will backlog in 304 stainless steel surface, will form the impression after rolling. Since the oil content of the emulsion within the lot, after annealing maintenance cover wall will form carbide deposited on the inner wall of the maintenance cover, among other processes, these carbon 304 stainless steel pipe will be brought to the surface area, so as to cover the 304 stainless steel tube surface affect the appearance of quality. After a long period of processing operations, the convection plate and the hob will accumulate a lot of oil, carbon black and dust and other debris, if not cleared up, the same will fall to the surface of the stainless steel plate. In fact, the chemical composition of the final analysis, 304 stainless steel pipe fittings and surface finish and cleanliness of the manufacturing environment is a great relationship, as long as timely convection plate, stove and clean the inner wall of the maintenance cover can indirectly improve the quality of the surface of 304 stainless steel pipe.

Within the service life of buildings, viega profi-press stainless steel pipe fittings almost don’t need to maintain and update of pipe fitting, a large number of save maintenance customers use costs, property damage and loss of service customers tend to zero. Viega profi-press conformity principle of stainless steel pipe fittings viega profi-press system includes: stainless steel tube, viega profi-press stainless steel pipe fittings, conformity of tools Viega profi-press stainless steel pipe ends of the u-shaped groove is equipped with a special rubber seal, when installation will be inserted into the viega profi-press stainless steel pipe socket to position the steps, with dedicated conformity of tools for u-shaped slot and the conformity of parts of the u-shaped slot on one or both sides on press-fitting homework at the same time. Rubber seal squeezed the prominent sealing function, in conformity of stainless steel pipe fittings and stainless steel pipe and contraction deformation (profile form a hexagonal shape), play a fixed role positioning, effectively realized the stainless steel pipe connection. Viega profi-press stain-less steel construction fast and convenient, the installation time is only 1/3 of the traditional pipe installation time (electric single conformity of just 5 s). Viega profi-press stainless steel pipe fittings of health, environmental protection, reliable, economic, long service life, maintenance free, free updates.

In the process of heat treatment of stainless steel pipe fittings, one not careful, stainless steel pipe fittings often appear some defects, thus affecting the quality of the products of heat treatment, appear even scrapped, so must take effective measures to prevent, and to have defects, should be set to save, the emphasis on analysis of common defects in stainless steel pipe fittings quenching process, and make the corresponding preventive and remedial measures. Defect: overheating and burnt Reason: the heating temperature is too high or the heating time is too long Preventive and remedial measures: 1. Correct selection of quenching heating temperature and heating time 2. The contralateral thermometer temperature scale calibrated regularly, prevent instrument malfunction and overtemperature 3. Reasonable furnace charging, prevent the workpiece and the heating body too close Defect: quenching distortion The reason: 1. Stainless steel casting workpiece shape asymmetry or thickness disparity 2. The machining stress is big, did not eliminate before quenching 3. Uneven heating and cooling 4. Heating of workpiece clamping methods and improper cooling 5. Quenching organization transformation Preventive and remedial measures: 1. Improve the workpiece structure, reasonable material selection, adjust the machining allowance, etc 2. Increasing preheat or to stress annealing process, reasonable heat treatment 3. Several times with preheating, precooling quenching and grade of double liquid quenching, quenching isothermal quenching and so on a variety of operating methods 4. Correct operation and reasonable support bundle, scattered cooling quenching heating workpiece 5. School was carried out on the deformation of the workpiece. Stainless steel welded pipe in overheating for 1 to 2 times after normalizing or annealing of fine grains, annealing, according to the normal process again across burning stain-less steel scrap processing.

Stainless steel welded pipe still need polishing, if they are not complicated structure can be used grinder type, handheld artifacts, efficiency will be higher. If you can’t use grinder type, can only use handheld grinding machine. Can use the net, stainless steel welding spot method of use: Apply a suitable amount of stainless steel welding spot net to the stainless steel surface to be processed, 1 ~ 2 mm thickness, maintain 5-30 minutes or longer (by dirt, sheet material and processing request), had better use the scrub brush a few times of treatment process, surface scale, rust, completely clean, better (lime, or caustic) rinse with clear water, avoid rust. Use or not use experience for the first time, must be small first trial satisfied after heavy use. Alloy steel has good resistance to high temperature oxidation and organizational stability, high temperature strength. But its poor weldability, hardening tendency, in the process of welding seam and heat affected zone may appear some problems as follows: (1) after welding in the welding seam and heat affected zone of hard and brittle hardening organization, if the internal stress is larger, can appear cold crack, toughness, plasticity decreases. (2) has a tendency to arc crater crack. (3) some alloy elements, has the welding hot cracking tendency, especially in the steel containing vanadium, boron. In order to avoid and eliminate the above defects, alloy steel requires preheating before welding, heat treatment after welding. Preheating before welding, the main purpose is to improve the material weldability. In the process of heating and maintain a certain temperature can reduce the temperature difference between the welding joint area lessened the hardening tendency of heat affected zone. In the welding process for hydrogen escape, reduce the hydrogen content in the weld, prevent cold cracks, improve the plasticity and toughness of welded joint. After heat treatment method is generally high temperature tempering, and its main purpose is: (1) to eliminate or reduce the internal stress produced in welding process, to prevent the welding seam and heat affected zone cracks. (2) improve the mechanical properties of weld seam and heat affected zone, namely to improve the plasticity and toughness, improve the hard brittle tendency. (3) improve the microstructure of weld seam and heat affected zone. General carbon steel welding performance is good, can need not preheating when welding and heat treatment. But for the carbon content is high, the stiffness of weldment, due to the large residual stress after welding, also need to preheat and heat treatment, such as carbon steel tube wall thickness in 30 mm.

What is the curvature of the curve, the curvature of the plane curve is aimed at a point on the curve tangent Angle for arc length of rotation rate, defined by differential, shows that the degree of curve deviates from the straight line. K = lim | Δ alpha/Δ s | Δ s tends to zero, curvature K is defined Pipe radius of curvature, the reciprocal of curvature is the curvature radius. Somewhere on the radius of curvature is mainly used to describe the curve curvature change, special, such as: a round in a circular arc curvature radius equals the radius of the circle, perhaps can understand like this: is that a curve of differential as far as possible, until the final approximation of a circular arc, the circular arc radius. Elbow according to the radius of curvature to points, pided into long radius elbow and short radius elbow 1) radius of curvature of the short radius elbow to elbow is approximately equal to the pipe diameter and R = 1 d. 2) refers to the long radius elbow bend curvature radius is approximately equal to 1.5 times the pipe diameter, R = 1.5 D. R as the radius of curvature, D bend diameter. Stainless steel pipe/curvature radius of curvature, to bend the sample: Elbow volume (the volume / 1000000 * material density values, is the weight, unit: kg/a) 1) torus volume formula = PI * r * r * 2 * PI * r r – ring body section radius r – ring into the center of the ring body body section center distance, the radius of curvature 2) hollow torus volume formula = (r * r – PI PI * * r ‘* r) * 2 * PI * r r’ – ring body section within a radius of 180 degrees, 90 degrees, 45 degrees Angle is equal to 1/2 respectively, 1/4, 1/8 hollow torus = 3), 90 – degree bend volume formula (r * r – PI PI * * r ‘* r) / 4 * 2 * PI * r = 2 * (D/D / 2 – (D – 2 * S) / 2 * (D – 2 * S) / 2) / 2 * PI * PI * r = (D – S) PI / 2 * PI * * S * r, D – bend diameter in mm S – elbow wall thickness, unit mm r – bend section center to the torus center distance, the radius of curvature, in mm For example, Such as 159 * 4 not 304 stainless steel 304 degree Angle, diameter is 159 mm, wall thickness of 4 mm to check the standard GB/T12459, long radius elbows curvature radius of 229 mm, short radius elbows curvature radius of 152 mm, 304 stainless steel elbow material density value is 7.93 g/cm ^ 3 g/mm ^ 3 = 7.93/1000 = 7.93/1000 Kg/mm ^ 3 The weight of the 90 – degree Angle formula = (D – S) * S * R * PI / 2 * PI * 7.93/1000000 Kg (1). 304 stainless steel material, the weight of 90 degrees of the long radius elbow = (159-4) * 4 * 229 * 3.14 * 3.14/2 * 7.93/1000000 = 5.55 Kg (2). 304 stainless steel material, the weight of 90 degrees of short radius elbow = (159-4) * 4 * 152 * 3.14 * 3.14/2 * 7.93/1000000 = 3.69 Kg