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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. 2. The characteristics of the stainless steel elbow, stainless steel elbow strength higher than that of carbon steel elbow, toughness is better than carbon steel elbow, stainless steel elbow corrosion resistance is strong. So in the chemical industry, papermaking and places of strong corrosive must use the stainless steel elbow, instead of using the carbon steel elbow. Due to the nature of the stainless steel elbow, the cost is also high in use. As aviation, aerospace, petroleum, chemical industry, metallurgy and food industry of booming development, such as stainless steel materials has been widely used, and the stainless steel stamping elbow materials because of the great toughness, high strength, low thermal conductivity, heat cutting large plastic deformation, the strain hardening, cutting heat, heat dissipation problem more severe, causing elbow high cutting temperature, cutting blade severe adhesion, easy to produce the devolop tumor, exacerbating the stainless steel stamping elbow wear and tear, and the processing surface coarse degree. Stainless steel stamping elbow the geometric Angle of cutting department, for the stainless steel stamping elbow machining yield rate, cutting tool costs, processed surface coarse degree, cutting force and work hardening etc all have great influence, reasonable choice and improve the efficiency of cutting tool geometry parameter is to guarantee the processing quality and progress, the effective ways to reduce capital. The choice of cutting tool materials Accurate selection of cutting tool materials is to ensure efficient processing of stainless steel stamping elbow determinants. According to characteristics of the cutting of the stainless steel stamping elbow, cutting tool material should have sufficient strength, high toughness, high hardness and wear resistance and stainless steel stamping elbow adhesion. Commonly used cutting tool materials have cemented carbide and high-speed steel two kinds big, complex shape of the cutter adopts high speed steel material. Because of the high speed steel cutting stainless steel stamping elbow when cutting speed cannot too tall, thus affect the progress of the production efficiency. For a simple tool cutting tool, cutting tool material should choose high strength, good thermal conductivity carbide, because of its hardness, wear resistance function is better than that of hot pressing elbow. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

To ensure the quality of stainless steel welded pipe, stainless steel welded pipe before delivery should be carried out with a number of strict quality testing. Specific detection is as below: 1. visual inspection. Trough the surface inspection found that there are many weld surface defects and deviations on sizes. 2. physical test. Further testing on the stainless steel welded pipe by ultrasonic, radiographic, and magnetic permeability and so on. 3. strength test. Through pressure test to check whether weld seam under pressure is tight enough to ensure the strength of stainless steel welded pipe. 4. density test. By kerosene test, load test and flush water test and other test to check whether there is no-dense spiral pipe defect when storing liquid or gas, such as penetrating cracks, pores, slag, incomplete penetration and loose organization. 5. hydrostatic testing. By hydrostatic test to check for each pipe to ensure leakage does not occur in the larger internal pressure situation. Is through these five strict and tight quality technical detection technology, it ensures the stainless steel welded pipe factory in the long-term performance and stability.

Three-roll rolling tube technology is the most advanced seamless steel tube rolling technology in the world today, firstly developed in Italy’s Innse company in the 1990 s. Its main characteristic is the fast production, large range of rolling steel tube specifications, products of high quality. But the technology equipment is complex, difficult to control, high positioning accuracy. The production of seamless steel tube is mainly used in the oil drilling, high pressure boiler tube, and many other fields.180 mm three-roll rolling unit is a key equipment to produce the diameter of 60 mm ~ 180 mm high quality seamless steel tube.  For a long time, the equipment can only rely on import in our country, the core technology and equipment is possessed by the international well-known machinery manufacturers SMS Meer (Innse) and Danieli. Due to various reasons, and form a complete set of electric control system is provided by international famous electric business for a long time. In recent years, along with the domestic technology level, the improvement of mechanical design and manufacturing, and electrical control, through research and development design, manufacturing and debugging operation, not only the development of localization of equipment with completely independent intellectual property rights, but also possess the complete sets of production capacity, break the foreign technology monopoly and fill the domestic blank.

When selecting stainless steel welded pipe in the corrosive environment, in addition to deal with the working conditions of stainless steel welded pipe has a detailed understanding, also need to consider the main factors are: stainless steel welded pipe corrosion resistance, and strength, toughness and physical properties, processing, formability, resources, price and obtain easily. 1. The corrosion resistance of the standard is for sure, both to admit it, use it, and cannot be bound by it, according to the specific requirements to determine whether the specific standard of corrosion. On the corrosion resistance of stainless steel welded pipe is used more 10 standard, choose which level as the requirement of corrosion resistance, want to consider equipment, part a (its thickness, size). The characteristics of using lifespan, product quality (such as impurities, color, purity) and so on request, generally speaking, in the process of using smooth mirror or size precision instrument equipment and components, can choose 1 ~ 3 grade standard; Work closely with the requirements. 2. The corrosion resistance is relative and conditional, often say stainless of stainless steel welded pipe, the corrosion resistance of point relative to the rust and corrosion resistant, is refers to under certain conditions (medium, concentration, temperature, impurities, pressure, flow velocity, etc) must be. So far, has not been in any corrosive environment are not rust resistance, corrosion resistance of stainless steel welded pipe, so option material researchers must according to the specific conditions of use to choose, stainless steel welded pipe type is selected, use the department have to choose the correct use of the characteristics of the stainless steel welded pipe is reasonable material selection and correct use of to achieve has the objective of does not rust or corrosion. 3. Choose the stainless steel welded pipe should not only consider the general corrosion resistance, also want to consider the performance of its resistance to local corrosion, and in some water chemical medium, which need more attention, this is because, typically more material attaches great importance to the general corrosion resistance of stainless steel welded pipe, and under the conditions of use, they are for local corrosion, such as sensitivity to the stress corrosion pitting corrosion and so on how to consider less; Stainless steel welded pipe more than in the general corrosion resistance good local corrosion occurred in corrosion environment, local corrosion often result in stainless steel welded pipe equipment, the sudden destruction of parts, the harm is far greater than the general corrosion. 4. The application of various kinds of manual data on the corrosion resistance of stainless steel welded pipe. 4. Under the condition of some use, will also meet this kind of situation, when the work in the media or in the production of industrial products, some or even contained the metal ions in the stainless steel welded pipe, it will affect the quality of the chemical process industry industrial products (including the luster, color, purity, etc.). This kind of situation in the nuclear fuel pharmaceutical and dye industries are the most common, often choose at this time does not contain an element of stainless steel welded pipe or appropriate chooses stainless steel welded pipe corrosion resistance level, so that the reduced to allow the limits of metal ions. 5. Stainless steel welding control device, if parts failure due to corrosion, should carry out the analysis of the corrosion damage reason, find out the reason after take measures, and should not be a throw it. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

For seawater desalination technology, energy conservation and the development of practical method is to use an evaporative enrichment equipment – VVCC (that is, the vacuum and evaporation, condensation, aggregation). The device adopts the heat pump, stainless steel welded pipe can use evaporation and transform it into heat energy supply system, so as to realize the energy conservation. And if cooperate with various technologies from concentrate recovery of valuable materials, and coagulation shrink as the pure water available. Such a system is indispensable to circular society, and stainless steel in every part of the device has played an important role. Cr formation of passive film of stainless steel welded pipe for nitric acid (HN03) show a significant that oxidizing acid corrosion resistance, but the sulfuric acid (- H2SO4) and hydrochloric acid (HC1) that non oxidizing acid, its poor corrosion resistance. So the joining of 8% or more Ni to improve on non oxidizing acid corrosion resistance. Stainless steel welded pipe can also adapt to outdoor and damp environment, processing is suitable for the production of various liquid concentration plant. Stainless steel have been used in the standard concentration device, used in the evaporation tank, the pipe, heat pump and other stainless steel material to occupy more than half. Required features, the first is to maximize its corrosion resistance, stainless steel welded pipe, especially the pipe, heat pump, such as corrosion, will cause a sharp negative impacts. Therefore, choose carefully before the material to the practical solution corrosion test is necessary. SUS304 steel should be used in general, the evaporation tank, while the pipe using SUS316L steel. In short, the use of the heat-pump principle VVCC evaporation concentration device, can greatly reduce the flow of the seawater desalination cost. Stainless steel welded pipe using the steam enrichment process, but also can significantly reduce CO2 emissions. In this, has played an important role in the use of stainless steel. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

China’s carbon steel flange industry prospects, but there are still some unfavorable factors to limit its further development. 1. As the main material of steel flanges, carbon steel due to the current pressure to increase the urgent need to transform. The steel industry may be in danger of underproduction. Reduced production will lead to a rise in steel prices in a short time, so the cost of steel flanges will also increase. Therefore, the price of steel flange will fluctuate, steel flange industry will be more affected. 2. In recent years, the rapid development of China’s steel industry, not only greatly improve the level of production, but also greatly increased production. However, the embarrassing situation is that SMEs and private enterprises to grow rapidly in the market to occupy a relatively large part; the contrary, large enterprises less competitive. From the current development situation, the carbon steel flange industry is also facing the risk of being eliminated. 3. Under the influence of the financial crisis, steel, construction, upstream and downstream industries of the market decline, the carbon steel flange industry is undoubtedly a fatal impact. To a certain extent, the financial crisis on the domestic steel industry had a negative impact, but the internal defects have been revealed. In the market economy system, the situation has greatly improved. 4. China’s carbon steel flange industry has a vast domestic market, but the export market is narrow. “Twelfth Five-Year Plan” will help achieve the new road of industrial development, building a resource-saving society and environment-friendly society under the guidance of. As the financial crisis, the domestic order declining, rising prices, the survival of the fittest to promote industrial reform; some of the backward production capacity is excluded, for the further development of carbon steel flange industry provides a better space.

With the development of flange industry, a lot more new flanges have already been become available. Also, flange has become put on wider industry areas, such as the petrochemical industry, oil refining industry, nuclear power industry, thermal power industry and the like. Bigger industrial applications mean more new requirements on flange quality and technology. And we have found the flange prospect in numerous industries. 1. Nuclear power industry: because the nuclear power infrastructure equipment, carbon steel flange, stainless flange, threaded flange, carbon steel elbow, stainless steel elbow and stainless steel tee occupy part of proportion with this industry. So, they need to continually introduce new items and equipment in this field in order to meet market demand. Petrochemical industry: there have invariably been intense competition and stringent requirements in this industry. 2. Petrochemical industry: there have invariably been intense competition and stringent requirements in this industry. Flange down the road will be coordinated with industrial automation to improve the general degree of flange equipment also to develop petrochemical flange equipment with multi-function, top quality and occasional consumption. Annual output worth of China’s petrochemical enterprises is at billions yearly, which demonstrates China features a great flange market. Therefore, we ought to move from the viewpoint of market changes to make certain steady development. 3. Oil industry: with some policy measures, the output and production of China’s oil refining industry continued to grow and structural adjustment gradually push forward. All these things maintained an excellent momentum of development so we is able to see there’s a huge market space for flange application in China’s oil refining industry. Additionally, the building industry and also other special industries furthermore have a huge requirement for flange. The effective use of flange is extremely extensive, which fully shows the rapid development and good prospect of flange industry.

The high pressure flange is suitable for pipelines on the conditions that PN10.0～25.0Mpa, working temperature —29℃～600℃, such as the petroleum, chemic, thermal power station to cut off or associated with the medium. Underhand flange connecting steel gate valve is acceptable for media like water, oil and steam.The operating methods are: manual drive, gear drive, electric drive, etc.. Flange industry has developed for over a decade, in those times, outside domestic Chinese policies and financial situation provided a great condition to build up the flange industry. What’s more, the raised space which very huge. Flange industry is expected to have a more substantial upgrade in the next few years. At the moment, China’s petrochemical industry is able to the direction of big-scale and international. Over the following five years, it continually maintain sustainable development. Dozens teams of ten millions-a great deal of oil refining unit and million-a great deal of ethylene plant is going to be built and expensed, which uncovers a perse niche for the Petrochemical valve and flange. Moreover, the various types of pumps running in domestic refineries have aged, which needs updating and remodeling. Next five years, the growth direction of utilizing flange trends to large scale, mechanical and electrical integration, in addition to Standardization and handle set. Specifically in high temperature and high pressure flange, low temperature flange and cryogenic flange, stainless steel flange, conveying sticky medium and the production technology of solid granules medium stainless steel flange develop rapidly, the demand will greatly increase. The price of flange companies are relatively stable, but with a slight rise and fall yearly, the magnitude is incredibly small, hence the flange marketplace is still bright.

Oil refining device of stainless steel welded pipe, generally exist in the process of using the following questions: (1) the stress corrosion cracking, transgranular fracture (mainly chloride), intergranular stress corrosion cracking (mainly sulfide). (2) the pitting corrosion, intergranular corrosion, (3) the naphthenic acid corrosion, mouth (4) the carburizing embrittlement. Corrosive factors mostly in oil refining crude oil into the together, the main for organic sulphur compounds (crude oil contains 0.01 5%) and inorganic salts (a few parts per million – 200 parts per million (PPM). Heating when they break down, may produce active substances, such as H2S and hydrochloric acid in the crude oil also contain so-called naphthenic acid organic acid, are too many content will cause the material corrosion, in addition to the crude oil into the corrosion factors, in order to improve the effect of refining, in addition to water, hydrogen, also using sulfuric acid and caustic alkali, ammonia, etc. Therefore, according to the different corrosion of oil refining device with different materials. Such as high temperature sulfur system considering Al and Cr sulfur corrosion resistance and high temperature strength, use the Cr5 – Mo above materials; High temperature H2S – H2 system using 13 cr – Al, 18-8 ni steel; Cr – Mo steel is used in the high temperature and high pressure H2 system or surfacing 18 Cr – ni – Nb steel; Low-temperature H2S – H2O system chooses 00 cr18ni10, 00 cr17ni14mo2 or monel alloy lining, H2S – HCl – H2O system selects more than 00 cr18ni5mo3si pitting corrosion resistance, resistance to stress corrosion of stainless steel welded pipe; Naphthenic acid system, chooses 00 cr17ni14mo2 can low velocity case, high velocity it needs further research; Low temperature CO2 corrosion system, generally at about 200 ℃ can use 00 cr18ni10; Response H2 equipment modification in the furnace tube, high temperature heating furnace of steel tube and various fluid of hanger, stents can choose 25 cr – ni, 20 Incone alloy 800, etc. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

In recent years, the broad market at home and abroad and the development of the growing demand led to the current Chinese stainless steel flange industry, especially the elastic stainless steel flange is very popular. This phenomenon has two reasons: First, using the continuous improvement of China’s economic status along with the continuous continuing development of China’s stainless steel flange industry, stainless flange products, increasingly more stainless steel flange products are exported to europe. Overseas requirements have directly stimulated chinese people manufacturers of stainless flange products and production. Second, the high quality of the victory. Domestic stainless steel flange product quality improvement can be an important cause of its growing demand. At the moment, China’s stainless steel flange market is booming. Only to develop technology so that you can try to occupy the industry of high-tech technology and science independent research and development and employ rights to build up stainless flange industry to give a solid cause of market, the answer to the creation of metal flange industry. In recent times, china government has promulgated some policies to compliment the domestic metal flange manufacturing industry, such as the metal flange project administrative review, China implemented the “open” services for example simplified procedures and reduced processes. For enterprises with stainless-steel flanges that meet the industrial policy, particularly in circular economy, safe production, environmental clean production and energy saving, tax reduction will slow up the burden on enterprises and promote the roll-out of enterprises Furthermore, the Government with the Regional financial structure to carry out macro-control, additionally, government entities encourages and props up the local stainless flange financing and loans. Simply these policies, China’s stainless steel flange industry will be in a quickly changing market environment to have stable and long-term development.

In recent years, china’s steel pipe industry has made great progress, but it still faces five major challenges. 1. Overcapacity led by the repeated investment and construction. China’s steel pipe industry in the last two years, not only a large number of production units, but also high-end equipment. In particular, seamless steel pipe has more than 10 production lines, and 10 units. Based on the highest production of 6.15 million tons per month in June last year, China ‘s steel production capacity has reached 74 million tons. In addition, some non-iron and steel enterprises are also investing in the steel pipe industry to expand overcapacity, not only increased the risk of investment, increased market competition, but also affect the stability of steel prices. This is why the price of Chinese steel pipe is unreasonable for a long time. 2. Increase costs, reduce profits. Iron ore and other raw material prices, continue to rise sharply so the cost of steel pipe is also increasing, and profits dropped significantly. Last year, from January to August, the average CIF price of iron ore was US $ 164.36 per ton, up 37.5% from a year earlier. Other raw material prices are also soaring, such as iron ore, coke, scrap, billet, steel and so on. At the same time, the domestic market has shown that the situation of excess supply did not improve the price of steel pipe, only less than 5% increase compared to the beginning of this year. Due to a substantial increase in the price of raw materials, steel pipe business profits continued to decline. It is estimated that the main sales profit margin is only 1%, lower than the steel pipe industry average sales profit margin. 3. International trade protectionism has intensified. China has become a net exporter of steel pipe, since 2005 than exports increased significantly year by year, causing concern of international counterparts. Double Negative Surveys Since 2009, global trade protectionism has grown stronger, with the exception of Europe and the United States, Russia, India, Brazil, Mexico, Canada, Argentina and other countries have taken sanctions against Chinese steel exporters, including anti-dumping and setting investigations Tax, which will further limit the export of Chinese steel pipe. This view held by wilsonpipeline Pipe Industry Co., Limited should control the export volume and develop a stable long-term market rather than focusing on immediate profits. 4. End products can not meet the needs of consumers. In some cases, the specific requirements of consumers in the specifications and quality of steel pipes, however, the domestic products can not meet their requirements due to unstable production, quantity shortage and other reasons, so they have to choose foreign products in a relatively High price. Last year, from January to August, China imported 54,100 tons of oil pipeline and 54,000 tons of heat pipe, accounting for 30.84% ​​of total imports and 30.78% of the seamless steel pipe and pipe. The development of oil well pipes should focus on high-end products such as hydrogen sulfide and CO2-corrosion resistant piping and alloy pipe seals and special threaded joints. 5. Elimination of backward production capacity is a difficult task. The leading technology in the China’s steel pipe industry produces seamless and welded steel pipes, as well as backward galvanized welded steel pipe for the production process. The latter one is still using low-end equipment and is environmentally friendly and should be improved or eliminated in the future. The face of complex circumstances, steel pipe enterprises should take some measurements. First, improve the ability of quality control, the establishment of a scientific regulatory system of production and staff. Second, deepen internal management, improve efficiency and profits. Third, adjust the product structure, expand the market. Finally, strengthen the industry self-discipline, to avoid vicious competition and safeguard common interests.

Pipe cap is probably the indispensable pipe products, plays an important role in the pipeline, it ends the prime-pressure pipe cap, threaded cap, metal cap and so on. Pipe cap may be the pipeline protection safety line, supplies a barrier for the pipeline, so that harmful substances won’t spread for construction workers and personnel to offer the best and many effective protection. When transporting hazardous substances, there should be multiple baffles to prevent leakage. In other words, it’s desirable to own multiple caps to ensure safety. To have, due to the negligence of construction workers, they often times forget to hide the pipe cap, that can cause much more severe consequences. Toxic, flammable and harmful substances will spread along the pipeline, pose a threat to the protection of human life. When dealing with it, we have to be cautious in the construction process, and make certain that after effectiveness from the work, all removed the hat returning to its original location. Inside the daily inspection, the pipe cap needs to be carefully checked for just about any damage or missing, if found to own problems, we’ve got to be resolved immediately to be sure the safety from the pipeline. Additionally, we should instead pay special attention to at risk of leakage problems. Raise the double protection or increase the quantity of cover to further improve the separation effect.