Small diameter welded pipe, also known as small diameter welded steel pipe, is a steel pipe welded by steel plate or strip steel after crimping. The production process of small-diameter welded pipe is simple, the production efficiency is high, the varietie ...

The process of hot galvanizing of flange is acid pickling assisted plating drying hot dip galvanizing separation cooling passivation. Customers who purchase flange will be galvanized according to the requirements of the use of the flange. Hot dip galvanizi ...

The cast flange has the advantages of accurate blank shape and size, small processing capacity and low cost, but it has casting defects (porosity, cracks and inclusions); the streamline of internal structure of casting is poor (even worse if it is a cuttin ...

Stainless steel pipes are usually divided into two categories: seamless pipes and seam welded pipes. In the production process, the required equipment is also different. The difference can be seen from the production process flow chart of the two: In the p ...

Anti-corrosive steel pipe lined with cement mortar refers to the anti-corrosive and wear-resistant treatment of cement mortar inside the pipe body. As the steel pipe lined with cement mortar is filled with concrete, it can absorb a lot of heat energy. Ther ...

Long-distance pipeline need some welding methods,the process as follows: First, manual welding (1) Arc welding of electrodes is sensitive and cumbersome, and has strong conformability. At the same time, due to the continuous improvement of electrode perfor ...

Slotted drain pipe is a practical, aesthetically pleasing drainage inlet product for the efficient removal of surface water and sheet flow on streets and highways. Slotted Drain Pipe is fabricated by welding a narrow section of grating in a continuous slot ...

Recently,some client feel query and ask “is there any PWHT requirement?” for some prefabrication.What’s post weld heat treatment (PWHT)? Broadly speaking, post weld heat treatment is the heat treatment of the welded area or welded compone ...

There are the cooling methods of common forgings after forming: In order to prevent the surface cracking of high carbon steel and high alloy steel, it is necessary to stack cooling, furnace cooling, sand embedding cooling or baking slow cooling in front of ...

Oxidation and decarburization When steel is heated, there is a layer of brittle iron scale on the surface is called oxidation; decarburization refers to the phenomenon that the carbon content on the surface decreases. Oxidation and decarburization will red ...

Forging heat treatment process regulations (process cards) and heat treatment forging schedules are necessary process documents for guiding heat treatment production. In addition, there should be temporary process notices, heat treatment process codes, hea ...

Why should we have heat treatment on steel pipes? What are the main types of steel pipes’ heat treatment process? Heat treatment is one of the important processes in the production process of steel pipes. It plays an important role in exploring poten ...

Normalizing is a heat treatment process in which steel parts are heated to 30-50 ℃ above the critical temperature and cooled in static air after holding for appropriate time. The main purpose of normalizing is to refine the microstructure, improve the prop ...

The purpose of heat treatment of forgings after forging is to adjust the hardness of the forgings and improve the cutting performance; eliminate the internal stress after forging; refine and uniform the coarse grains during the forging process to prepare t ...

In China,3PE anticorrosive steel pipes have been applied in oil and gas systems,nearly 4,000 kilometers of the national key project West-East Gas Pipeline have used 3PE anti-corrosion steel pipes. We have also exported a lot of 3PE coated steel pipes to ma ...

For the steel water transmission pipes and fittings,the coatings are necessary to use in order to prolong the service life of products.The often used standard is AWWA standard.There are several coating types for steel pipes and fittings under this standard ...

Sometimes clients ask for the coal tar enamel coating or lining for the pipeline.We all know that coating or lining could protect the pipeline from corrosion and expand the service life.But how does it works? The coal tar pitch, which forms the basis for t ...

Global trends in pipeline technology and pipeline coatings are in part dictated by where the oil and gas reserves are located. These reserves are becoming increasingly difficult to find. Producers are looking further afield and often find the reserves are ...

Corrosion of pipe fittings refers to the degradation and destruction of metal materials caused by the chemical and electrochemical action between the metal material surface and the environmental medium. In petroleum pipelines, common corrosion is mainly ca ...

Butt weld fittings general A pipe fitting is defined as a part used in a piping system, for changing direction, branching or for change of pipe diameter, and which is mechanically joined to the system. There are many different types of fittings and they ar ...