The corrosion resistances of enamel-coated steel pipe in 3.5 wt% NaCl solution was evaluated and compared with those of epoxy-coated pipe using open-circuit potential, linear po- larization resistance, and electrochemical impedance spectros- copy tests. T-001c enamel slurry and GP2118 enamel powder were sprayed to steel pipe in wet and electrostatic processes, respectively. The phase composition and microstructures of the two enamels were characterized with x-ray diffraction and scanning electron microscopy (SEM). The surface roughness of enamels and their bond strength with steel substrates were quantified to understand coating quality. SEM images revealed that both types of enamel coatings have a solid structure with isolated bubbles. Electrochemical tests showed a high corrosion resistance of the enamel coatings as verified in visual inspection on the tested samples. In particular, the GP2118 enamel-coated samples consistently outperformed the epoxy-coated samples.

Stainless steel welded pipe needs to be protected by nitrogen when welding. What is the principle of nitrogen-protected stainless steel welded pipe ?

Stainless steel welded pipes will have some defects in the welding process. The defects of stainless steel welded pipes will lead to stress concentration, reduce bearing capacity, shorten service life and even cause brittle fracture. General technical regulations stipulate that cracks, incomplete penetration, unfused and surface slag are not allowed; defects such as undercut, internal slag and pores cannot exceed certain allowable values, and must be thoroughly removed and welded for excessive defects. Make up. The causes, hazards and preventive measures of welding defects of common stainless steel welded pipes are briefly described below.

Stainless steel welded pipe is characterized by high temperature resistance and corrosion resistance. What is the reason for the high temperature resistance of stainless steel welded pipe ?

With the popularization of stainless steel welded pipe applications, the performance of stainless steel welded pipes has attracted more and more attention. Corrosion occurs when stainless steel welded pipes are used for a long time. What causes corrosion of stainless steel welded pipes?

Compared with carbon steel, 　　high temperature stainless steel welded pipe has a slightly higher density than ferrite and martensitic stainless steel, and slightly lower than high temperature resistant stainless steel; resistivity is carbon steel, ferrite type, martensite type and austenitic The order of the stainless steel is increasing; the order of the coefficient of linear expansion is similar, the austenitic stainless steel is the highest and the carbon steel is the smallest; the carbon steel, ferritic and martensitic stainless steel are magnetic, and the austenitic stainless steel is non-magnetic, but its When cold work hardening forms a phase transformation, it will generate magnetism, and the martensite structure can be removed by heat treatment to restore its non-magnetic properties.

Stainless steel decorative pipe elbows often have problems in the processing process. If you are not paying attention, the angle may be too large or broken. For this, Wuxi Silver Coral Stainless Steel Co., Ltd. summarizes some of the stainless steel decorative pipe elbows. Note, for your reference only:

Many people don't understand the difference between stainless steel decorative tubes and product tubes. Why is the same specification, the price is so different? Now Rongxingyuan Xiaobian will let you know the difference between decorative tubes and product tubes.

The stainless steel decorative pipe is a stainless steel pipe made by welding a steel plate or a steel belt through a unit and a die. Let's take a look at the process flow of the stainless steel decorative tube with the small series.

Commonly used stainless steel decorative tubes on the market are polished tubes with a surface that is bright. So what factors affect the polishing of the stainless steel decorative tube surface?

Stainless steel decorative tubes , in general terms, are steel that is not easily rusted. The stainless steel tube has both rust and corrosion resistance due to the formation of a chromium-rich oxide film (passivation film) on its surface. This rust and corrosion resistance are relative. The test shows that the corrosion resistance of steel in the weak medium such as atmosphere and water and oxidizing medium such as nitric acid increases with the increase of chromium content in steel. When the chromium content reaches a certain percentage, the corrosion resistance of steel is abrupt. From rust to rust, from corrosion resistance to corrosion resistance.

What is LSAW pipe means LSAW (Longitudinal double submerge arc welding) carbon steel pipe is a type of SAW pipe made of steel plates that were hot rolled by JCOE or UOE forming technology. JCOE technology represents the shaping and forming processes involved during manufacturing as well as the inner and outer welding and cold expansion carried out after welding.

Always in pipeline systems we met the material with NACE MR0175/ISO 15156 pipe or fittings, so do you really know what is the major differences between NACE carbon pipe and normal carbon steel pipe? And how is the cost for nace material?

Steel pipe pile is a type of steel piling material. It is usually referred to the carbon steel pipe manufactured in seamless or welded (SSAW or LSAW), used for supporting and stabilizing the foundation of a building. So a pipe pile is a structural construction material.

Fire sprinkler pipe and related fittings are generally made of carbon steel or ductile iron material and used to carry water or other liquid to connect firefighting equipment. It is also called fire protection pipe and fittings. According to the corresponding rules and standards, the fire pipeline need to be red painted, (or with red anti corrosion epoxy coating), the point is to separately with other pipeline system. Since the fire sprinkler pipe usually installed in a static position, it requires a high level and restrict quality control.

As we know ASTM A106 Grade B pipe is one of the most popular seamless steel pipes applied in different industries. Not only in pipeline systems like oil and gas, water, mineral slurry transmission, but also for boiler, construction, structural purposes.

Polyurethane direct buried seamless insulation pipe has become a mature advanced technology in developed countries. China's heating engineering technicians have passed this research to promote this technology to promote the development of domestic pipe network technology to a higher level. Polyurethane direct-buried insulation tube is made of high-performance polyether polyol composition and multiple methyl polyphenyl polyisocyanate as raw materials, and then chemically foamed. It is widely used in indoor and outdoor pipelines and central heating. Pipe, chemical, pharmaceutical industry pipelines and other insulation, cold preservation projects. Polyurethane polyurethane direct buried seamless insulation pipeshould pay attention to the installation and explanation:

Insulation steel pipe high-density polyethylene polyurethane insulation pipe, polyurethane direct-buried insulation pipe is widely used in liquid and gas transportation pipe network, chemical pipeline insulation engineering petroleum, chemical, centralized heating and heating network, central air-conditioning ventilation pipe, municipal engineering. The high temperature prefabricated direct buried thermal insulation pipe is a direct buried prefabricated thermal insulation pipe with good thermal insulation performance, safe and reliable, and low engineering cost. It effectively solves the problem of insulation, sliding lubrication and waterproofing of exposed pipe ends of 13O °C-6OO °C high temperature heat transfer prefabricated direct buried insulation pipe in urban central heating.

The prefabricated polyurethane direct buried thermal insulation pipe not only has the advanced technology and practical performance which are difficult to compare with the traditional trench and overhead laying pipeline, but also has significant social and economic benefits, and is also a powerful measure for heating energy saving. The adoption of direct buried heating pipeline technology indicates that the development of China's heating pipeline technology has entered a new starting point. With the further improvement and development of this advanced technology, it is imperative to directly replace the trench and overhead of the heating pipeline.

On November 12, the European Commission made a preliminary ruling on anti-dumping investigations on seamless steel pipe products originating in China, and decided to implement a six-month temporary anti-dumping measure. The head of the Trade Relief and Investigation Bureau of the Ministry of Commerce made a statement on this.

　　The proper selection and use of the electrode directly affects the chemical composition and performance of the weld, which is an important part of the preparation of large-diameter seamless steel pipe welding. Choosing the right electrode requires a comprehensive consideration of various factors, and sometimes it needs to be tested and verified before it can be finalized. The aspects to be considered are as follows: the performance requirements of the weld metal , the shape of the electrode, the rigidity and the position of the weld, the crack resistance of the weld metal, the processability, equipment and construction conditions, and economic rationality.