2012年11月15日星期四

Stainless steel welded pipe replacement heat exchanger manifold advantages introduced


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The past five years, the stainless steel welded pipe industry development situation is relatively good, regardless of size, quality, production technology has made great strides, especially its demand areas are gradually expanding, with stainless steel pip e process maturing, many products can replace stainless steel seamless pipe, such as: the heat exchanger tubes, low pressure boiler tubes.

 

Stainless steel welded pipe production features production equipment is lightweight, less investment, speed of construction, welding method is simple, wide range of product specifications, dimensional accuracy, thickness deviation, smooth surface, high-yield. In the case of mass production, the welded pipe more than 20% lower than seamless cost. In recent years, the domestic use of the stainless steel tube welding? D rolling "production process, with cold-rolled coil to specification requirements slitting, after forming, multi-gun TIG welding machine welding tube, then cold-rolled (pull) the performance indicators that the weld is consistent with the parent material, product quality has improved significantly. Therefore, stainless steel seamless pipe, stainless steel pipe instead of more and more obvious advantages.sanitary pump

 

Stainless steel welded pipe production advantages:Stainless steel reducer

 

Stainless steel welded tube experience in the production process, by uniform compression, then through online bright solid melt annealing, the surface becomes very smooth, and the smooth surface is not easy to fouling, with anti-fouling. This is not only conducive to heat and does not require regular cleaning, saving time and effort to save money. Second, the pipe is a plate of deep processing products, the advantages of its uniform thickness is unparalleled, also can arbitrarily cut to length, high accuracy. Again, the stainless steel has the characteristics of corrosion-resistant, longer life use.

 

Stainless steel welded pipe products status quo:

 

Of industrial stainless steel pipe production capacity can not meet the domestic market demand, most of the existing stainless steel welded pipe mill process equipment is not complete, such as lack of heat treatment and online testing equipment, the production capac ity of the unit is not to give full play to, generally only can produce decorative tube, medium and low standard of decorative stainless steel welded pipe oversupply; higher standard industrial pipe, such as chemical mechanical tube, heat exchanger tube, only a few manufacturers can produce, production serious lack of capacity.Pipe Fittings

 

One of the alternatives "heat exchanger tubes":

 

The heat exchanger tube is an essential part of the column and tube heat exchanger equipment, heat exchanger tube is generally selected under the pressure of the fluid medium. Misunderstanding of the market on the choice of the heat exchanger tube is one of stainless steel welded pipe can not be used as a heat exchanger tube, but GB/151-1999 where expressly provided in the tube pressure ≤ 6.4MPa can choose stainless steel welded pipe. Especially in the case of stainless steel welded pipe production process is now very mature, fully meet the needs of the general heat exchanger tube, and demonstrated its unique advantages.

 

Since the heat exchanger tubes constituting the heat transfer surfaces of the heat exchanger, so the size of the heat exchanger tube has a great influence on the heat transfer. Using a small diameter tube, the heat transfer area of ??the heat exchanger per unit volume is large, the device is relatively compact, less consumption per heat transfer area of ??the metal, the heat transfer coefficient is also higher. Make trouble, there is easy scaling of the tube, difficult to clean, but the above problems can be avoided austenitic stainless steel welded pipe as a heat exchanger tube, because austenitic stainless steel welded pipe and both have good corrosion resistance is also equipped with a smooth surface, while the production of process maturity, austenitic stainless steel welded pipe as the first choice of the heat exchanger tube.

Improve the the stainless wear resistance of thermal spray and plating method


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1, the thermal spray

Thermal spraying is the use of some heat source to the coating material is heated to a molten or semi-molten state, and simultaneously by means of a flame st ream and a high-speed gas to atomization, and to promote these atomized particles are sprayed onto the substrate surface, deposition into with a certain The function of the coating. Thermal spray workpiece surface abrasion resistance, corrosion resistance, high temperature coating. Often exists between the coating material and substrate combination of three ways: mechanical bonding, physical bonding, and metallurgical bonding. With the low pressure plasma spraying, high-energy, high velocity plasma spraying, the emergence of high-speed flame spraying technique, the performance of the coating has been further improved: the porosity can be reduced from 015% to 1%; the bonding strength of the coating and the substrate can be up to 70 ~ 140MPa .pipe fittings

Studies have shown that HVOF spraying (HVOF) technology and plasma spraying (ASP) technology, iron-based amorphous alloy coating and iron-based amorphous and nanocrystalline coating, were prepared the 0Cr13Ni5Mo stainless steel substrate studied two Tu layer at room temperature friction and wear characteristics, the results show that the two sprayed prepared iron-based coating has high microhardness and smaller porosity, compact structure, was typical of the layered structure, improved coating wear resistance.
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2, plating

In order to compensate for stainless steel and soft not wear, and the vulnerability of a large friction coefficient, the electroplating method commonly used to improve the stainless steel shaft and the mating member such as surface hardness and self-lubricating properties. Stainless steel is a surface easily passivated metal must be removed before plating surface passivation film, stainless steel degreasing, dipping, activation, pre-plated nickel and electroplating processes, chromium, zinc, copper, tin, precious metals can be obtained and other coatings.stainless steel clamps

Study shows that in the base material of stainless steel turbine cycle inverted rare earth chromium plating, the plating thickness of about 013mm, coating by the metal matrix phase and a rare earth salt particles the second phase composition, the hardness can reach 900 to 1000 Hv, the abrasion resistance of the coating base material 25 to 28 times, the product of the working life of 2 to 6 times higher than the original pieces of stainless steel

Stainless steel nitride technology


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Stainless steel nitrided to increase its hardness and improve its abrasion resistance and resistance to erosion. The nitriding treatment usually ferritic, martensitic and austenitic stainless steel and heat-resistant steel. The high-speed steel should be carried out low-temperature short-time nitri ded.Sanitary pipe fittings
Stainless steel nitrided lies in the removal of the passivation film, the passivation film is stainless steel to rust and the reason can not nitrided, so to make stainless steel nitrided, the key is the removal of the surface of the passivation film. The method of removal of the passivation film has a chemical and a mechanical method,
(1) sandblasting. Workpiece before nitriding with fine sand blast treatment under a pressure of 0.15-0.25MPa, until the surface was dark gray, clear immediately after the surface of dust into th e furnace.
(2) phosphide. Nitriding of the workpiece before the phosphating treatment can damage the metal surface of the oxide film, forming a porous loose phosphide layer, and is conducive to the infiltration of a nitrogen atom,
(3) chloride foam. Blasting or the finishing of the workpiece chloride foam or coating, can effectively remove the oxide film. Common the chlorides have TiCl2 and TiCl3.
The nitriding treatment usually ferritic, martensitic and austenitic stainless steel and heat-resistant steel.Pipe Fittings
The chemical method the workpiece is soaked in 50% (by volume) of hydrochloric acid (temperature 70 degrees), and then water cleaned.steel pipe fittings

2012年11月12日星期一

Stamping elbow Cautions


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Stamping elbow has some corrosion the (oxidizing acids, organic acids, cavitation), heat and abrasion resistance. Typically used in power plants, chemical, oil, and other equipment and materials. Chromium stainless steel stamping elbow welded p oor, should pay attention to the welding process, heat treatment conditions and the appropriate choice of welding electrodes. Stamping elbow drug skin titanium calcium type low hydrogen type. Titanium calcium type can be used for AC-DC and AC welding penetration shallow, and at the same time easy to redness, it is stainless steel stamping elbow as much as possible using a DC power supply.
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Steps / methods stamping elbow sclerosing larger cracks easily use different welding electrodes for welding, to ensure the quality of t he welding stamping elbow after welding. Using the same type of chromium stamping elbow welding electrodes must be carried out about 300 ° C above the preheating and post weld 700 ° C slow cooling treatment. Weldment can not post-weld heat treatment should be used chrome-nickel stamping elbow. In use, the different types of electrodes have different properties and characteristics, in use, in accordance with the corresponding need for selection, and to protect the quality of the welding stamping elbow.

Stamping elbow should be kept dry, titanium calcium type should be dried at 150 ℃ for 1 hour, low hydrogen type should be dried by 200-250 ℃ for one hour (not repeated drying or drug skin prone to cracking peeling) prevent the stainless steel stamping elbow drug skin sticky oil and dirt, to avoid causing increased carbon content and impact of the weldment quality stainless steel stamping elbow weld.Stainless steel elbow

To improve the corrosion resistance and weldability of the stamping elbow, the appropriate increase in the production of moderate stability elements Ti, Nb, mo, weldability than chromium stamping elbow. Preheat and post-weld above 200 ℃ and 800 ℃ tempered, using the same type of chromium stainless steel stamping elbow. Weldment is not heat-treated, you should use the chrome-nickel stainless steel stamping elbow.

Welding stamping elbow after heating will release carbide, carbide precipitation by repeated heating, carbide released stamping elbow will affect the performance and reduce the corrosion resistance and mechanical properties. The above is the need to pay attention to stamping elbow, you need to use, in accordance with the methods and matters to ensure good use of value and performance.sanitary pump

Stamping elbow with good corrosion resistance and oxidation resistance, and good to promote its use in different areas and promotion, widely used in chemical, fertilizer, petroleum, medical machinery manufacturing.

Stamping elbow is an elbow, widely used in different fields and industries and promote the app lication and popularization of varying degrees. Stamping elbow with plates of the same material of the pipe with a stamping die stamping into half a ring elbow, then two half-ring elbow group forming welding, stamping elbow welding in accordance with certain processes of production and processing . Below explain the precautions and methods of stamping elbow, in use strict attention, to ensure the quality and performance of the stamping elbow, it has a good life.

 

The clamp fittings connected conducive to construction safety


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    Stainless steel clamp pipe connection clamp pipe connection technology, the site only need cutting machine, roll groove machine and tight button snails

Bolt with wrench and construction organizations.Stainless steel reducer
 
The use of welded and flanged connections, in case of need to be equipped with a the complex power cable, cutting machines, welding machines and oxygen and acetylene

Cylinders, etc., which were brought to the construction organization complexity, and also there is the risk of leakage and fire hazards.

Welding slag generated by welding and gas cutting, unavoidable names fall into the inside of the pipe, piping valves and fittings and even prone to us e

Clogging to the device, but also pollute the water quality tube.stainless steel tee

In addition, welding and flange connection can not be high-intensity aerial work takes a long time to avoid name also prone to production safety
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Accident.

Clamp operation


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 Stainless steel clamps, the application process is how to do? Next we come to the given description:

Pipe cutting machine steel pipe cutting desired length of incisions sectional level meter to check, to ensure that the incisio n pipe cross section and

Perpendicular to the axis. Incision if there are glitches, applications grinder sanded smooth.steel pipe fittings

2. Clamp will be machined grooved steel pipe mounted in the tail rack roller slot machine and roll groove machine, level Level copied, the steel pipe

Is in a horizontal position.clamp ferrule

3. Clamp the steel processing end section close to the roll groove machine, vertical steel pipe in the axis of the wheel surface.

4. Slowly depressed. Jack, on snapping steel pipe, pressure roller and start rolling slot machine, the wheel one rotation, then attention view

Observe whether the steel pipe cross-section still snapping roll groove machine, if not snapping, adjust the tube to the horizontal. If snapping, slowly
Stainless steel flange
Depressed jack, the upper pressure roller evenly rolled steel to a predetermined groove depth.

Clamp down, check the groove depth and width with a vernier caliper, and found to comply with the requirements of the standard, the jack unloading

Dutch, remove the pipe.

Clamp application process, the grasp of the Notes must be prepared and used to pay attention to maintenance, to prolong its life.

2012年11月8日星期四

The bathroom waterproof decoration nine to create the perfect space for details


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Now, for the renovation of toilets and bathrooms, how to reflect its comfort and safety, became a focus of the renovation. Reporters learned in an interview with the home improvement industry insiders, many bathroom renovation details involved in home decoration. If not handled properly, will not only directly affect the quality of home life in the future, it will affect the mood. Bathroom renovation should pay attention to the following points:
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Bathroom waterproof decoration details, ceiling:
Heavier because of water vapor in the bathroom, so, to select those with a waterproof, anti-corrosion, anti-rust characteristics of the material.
Details of sanitary waterproof decoration 2, the ground:
Be sure to do before the floor tile, waterproof;, to ensure that the tile surface with a draining slope (generally 1 or so), the slope towards the floor drain in the tiled; closed water test must be done after the ground finished laying tile, time to ensure that at least 24 hours; laying floor tiles and wall tiles slit aligned to ensure the overall sense of the whole bathroom to avoid visual clutter impression.
Stainless steel flange
Bathroom waterproof decoration details, wall:
Proof and waterproof wall tiles to do well, and to ensure smooth tiling and tiles slit, aligned to the overall sense of the wall and the ground; encountered the feed line export tiles cut smaller, appropriate, convenient flange cover to cover in the water supply on the incision, making a perfect appearance.

Bathroom waterproof decoration details, doors and windows:
Best bathroom windows for ventilation; If there is no window, with particular attention to the details of the door. If the sliding doors to prevent water to leak out, the door sector is slightly higher than the inside of bathroom; gap of the bathroom door and the ground to stay bigger, in order to facilitate the return air; bathroom, but also in the sliding door and between the bathroom tiles to do a layer of waterproofing.
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The bathroom waterproof renovation laying detail 5, circuit:
Wire joints in the bathroom must be linked to tin, and to have to wrap waterproof tape and insulating tape, to ensure the safety; wire body must put on the flame tube; All switches and sockets must be moisture-proof box, and the location is also depending on electrical size and location may be, in order to ensure a reasonable convenience in use. This article from the Asia-Pacific sanitary www.ytwy360.com

Bathroom waterproof decoration details, water reform:
Water supply and drainage lines in the bathroom is best not to do too much change, if you want changes, according to the specific circumstances, such as the washing mac hine models, up and down the location of the water will be different.

Bathroom waterproof decoration details sanitary installation:
Best in renovation before launching Pitch remember well, selected by size bathtub, bath room, toilet, wash basin, sanitary ware, to avoid in the decoration of the wrong size; Toilet installation first potty mud seal use expansion screws or plastic glass fixed, so easy to repair when the toilet is clogged.

Details of sanitary waterproof decoration 8, ventilation:
Must have a bathroom exhaust fan and exhaust fan must be safe to have retrograde gate to prevent the polluted air back.

Details of sanitary waterproof decoration 9, Green:
Add angry. The toilet should not be forgotten is the green corner. The renovation can choose shade-tolerant, hygrophilous potted plants placed in the bathroom, so kind of angry and freshness.

Ceramic sanitary radiation hazards that you know how much?


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Radon have a high affinity for the human body fat, which affects the nervous system, people listlessness, drowsiness; vitro radiation mainly refers to the natural stone radiator direct exposure to the human body produces a biological effect, be the human body s blood-forming organs, nervous system, reproductive system, and digestive system damage.

A, β, γ-ray will destroy the body s lymphocytes, reduced immunity peoplesteel pipe fittings

Tile vitro radiation comes mainly from raw materials containing chemical elements, such as radium and thorium decay γ, β-ray.

2.β rays shorter range children, however, because its penetration is relativel y weak, a book you can block the penetration.

3.γ ray penetration is very strong. Penetrate the human body and in vivo cell collision will disrupt the body s lymphocytes which then lead to reduced immunity.
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Second, tiles consumer radiation has two main aspects: radiation in vitro and in vivo radiation.

Body radiation refers radon radiation on the human body, Radon is a natural radioactive substances, colorless and tasteless, with easy-proliferation, soluble in water, and easily the characteristics of t he fat-soluble.

2 tiles in radon emanating primarily derived from a chemical substance called radium, such substances are contained by the raw materials of the tile, such as slag, as an emulsifier, zircon sand (which main the role is to improve the tile finish and wearable) contain radium.stainless steel pipe fittings

The major role of welded flange


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 Welded flange is a disk-shaped parts, the most common in the pipeline project, flanges are used in pairs. In the pipeline project, the flange is mainly used for the connection of the pipeline. N eed to connect pipes, various mounting a flange, low-pressure pipe can be used silk flange, the use of more than 4 kg pressure welding flanges. Plus sealing point between the two flanges, and then secured with bolts. Different pressure welded flange thickness and use different bolt. Pumps and valves, and pipe connections, facilities and equipment of the local, but also made a corresponding flange shape, also called a flange connection. All in two planes used in the surrounding bolted closed simultaneously connected parts, generally known as the "flange", such as ventilation pipe connections, this type of parts can be called a "flange parts. But this connection is only local device, such as flange connections and pumps, it is not good to pump called the "flange parts. Relatively small, such as valves, can be called "flange parts.Pipe Fittings
The welded flange role:
1, connecting piping and to keep the duct sealing performancestainless steel clamps;
2, to facilitate the replacement of a certain pipeline;
Easy to open the inspection line;
4, to facilitate certain conduit clo sed.stainless steel tee

What are the methods of identification of shoddy steel pipe?


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The shoddy steel pipe identification methods
     Shoddy steel pipe prone to folding. Folding steel pipe formed on the surface of various polyline, this defect is often longitudinall y throughout the entire product. Generate a folded reason is the the shoddy manufacturers to pursue high efficiency, the amount of reduction is too large, resulting in the ears, generated under a rolling folding, the folded products after bending will crack, a large decline in the strength of steel.
     2. The shoddy steel pipe appearance often pockmarked face. Ma surface is due to the steel surface irregularities uneven groove wear and tear caused by serious defects. Since the shoddy steel pipe manufacturers to the pursuit of profit, often the most excessive groove rolling. 3. The shoddy steel pipe surface is easy to produce scarring. There are two reasons: (1). Uneven the shoddy steel pipe material impurities. (2). Shabby, shoddy material manufacturers to guide and guard the equipment easy to stick easy to produce steel, of these impurities bite roll scarring.stainless steel clamps
     4. The inferior surface of the sheet is easy to produce cracks, because it dough adobe adobe many pores, the adobe due to thermal stress in the cooling process, resulting in cracks, after after rolling there crack.
     5. The shoddy steel pipe easily scratched due to shoddy steel pipe equipment is very easy to produce glitch scratch the surface of steel. The depth of scratches reduces the strength of steel.
     6. Shoddy steel pipe without metallic luster, pale red or similar color of the pig iron, because there are two two it blank is adobe. 2, non-standard the shoddy rolling temperature, the temperature of the steel is by visual observation, so that can not be carried out according to the provisions of the austenitic region of rolling steel performance standards naturally not.
     7. Thin and low, the shoddy steel pipe cross ribs often sufficient dissatisfaction with the phenomenon, because the manufacturers for large negative tolerance, finished the previous lane reduction is too large, iron-type small, pass sufficient dissatisfaction.Stainl ess steel flange
     8. The shoddy oval cross section of the steel pipe, because manufacturers in order to save material, finished roll two reduction is too large, the strength of this steel is greatly decreased, and does not conform to the standard of rebar Dimensions. 9. Uniform composition of the high-quality steel, cold shear tonnage, smooth and neat end face of the cutting head, shoddy material material difference, the end face of the cutting head, there are often off the meat of the phenomenon that is uneven and non-metallic luster. And because of shoddy materials manufacturers cutting head, the head and tail big ears.
     10. Shoddy steel material containing impurities, the density of steel is too small, and the size serious ultra-poor, so in the case of without a vernier caliper, were weighed it checked. For example, the rebar 20, the national standards set forth maximum negative tolerance of 5% Le ngth 9M single theoretical weight of 120 kg minimum weight should be: 120 X (l-5%) = 114 kilograms of weighing out the actual weight of more than 114 kg single small, shoddy steel because it is more than 5% negative tolerance. In general, the whole proportionate amount would be better, mainly taking into account the cumulative error probability theory this problem.
     11. The shoddy steel pipe diameter size fluctuations because; l, steel temperature instability of yin and yang face. 2, the composition of the steel is uneven. 3, poorly equipped, low-foundation strength, mill bouncing. Appear larger changes in the same week, reinforced Unevenness of fracture.steel pipe fittings

The large caliber elbow Profile push the system


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Large diameter elbow to push the system push the system, the wall thickness should not change under normal circumstances, but if because Tools reason, some places will be less w all phenomenon occurs, it is generally mentioned material, wall thickness to add some margin, such as the elbow is the wall thickness of 8.18mm, generally mentioned tube of about 8.5mm, to prevent the push the system, due to the local less thick ultra-poor. Whole good shape after elbow outside diameter, wall thickness dimensions are required. The following finishing process, after shot peening, the the elbow both inside and outside surface of the iron oxide skin removed, both ends of the groove processing to facilitate welding. Checked, after the process of playing steel word, spray paint, packaging, ready for shipping. Above 24 〃 seamless steel pipe elbow production methods as a raw material, after more than 24 〃 more than 600mm, maximum elbow between 2.032 m to 2.80 m, with a steel plate to do.stainless steel reduce
Large diameter elbow push the system has some differences with other production and processing of the elbow, need to be produced according to certain criteria, to ensure that the production of the push system elbow to show good use of the value in use. Elbow push the system molding process and production processes need to be in a certain space and venue production, production to comply with certain processes and process stainless steel pipe fittingsstandards. The elbow fittings has a different production technology and processes, processing, production and processing under certain circumstances, elbow fittings of the different nature of processing need to take certain precautions. To push the system elbow down, push the system to do long radius elbow first to the first selected steel pipe specifications proposed pipe material, the choice of quality steel production. Elbow push the system to certain expansion ratio, by theoretical calculations, and general expansion ratio between 33% -35%, pushing down the back. Short radius 219mm Usually the enlarged diameter was 50%. After selecting the raw material, the press push system elbow Specifications feed, and then consider the radius of curvature, for example, 90 ° elbow, through its curvature can be calculated Multi long material can be processed to a 90 ° elbow. By theoretical calculation can be calculated, then the length is cut to length for cutting. Finally, the material thermal push the system.Sanitary pipe fittings

2012年11月5日星期一

The Groove Tube advantages of three: the system is stable and easy maintenance


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        The groove pipe connection has a unique flexible characteristics, so that pipe having anti-vibration, anti-shrinkage and expansion of capacity, compared with the welding and the flange connection, the increase in the stability of the pipeline system, and more suitable for changes in temperature, thereby protecting the pipeline valve member and also reduces the of pipeline stress on the destruction of the structural member.
 Stainless steel elbow

        The groove pipe connection has a unique flexible characteristics, so that pipe having anti-vibration, anti-shrinkage and expansion of capacity, compared with the welding and the flange connection, the increase in the stability of the pipeline system, and m ore suitable for changes in temperature, thereby protecting the pipeline valve member and also reduces the of pipeline stress on the destruction of the structural member.

        Groove Tube connected simple operation, the required operating space smaller, many convenient conditions for future repairs. When the pipes in need of repair and replacement, simply loosen the two clamps to any replacement, rotate, modify the section of pipe. Without damage to the surrounding wall, reducing maintenance time and maintenance costs.steel pipe fittings< /a>

What is slipknot elbow


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Slipknot elbow and general elbow is a common connection pipe installation fittings, connect two nominal diameter is the same or different pipe, the pipe do a certain angle turn.

The slipknot elbow Material 304,316 L two, inside and outside the high-end polishing equipment for treatment, to reach the surface precision requirements.Stainless steel elbow

It applies to the stainless steel pipeline system for the dairy, food, beer, beverage, pharmaceutical, cosmetics and other industrial fields.

Curvature radius 52-130 (mm)
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Nominal diameter 15-100 (mm)

Seamless elbow forming process of the heat pushing, stamping, extrusion, etc..