The classification of heat-supply pipelines According to the different flow media in the pipe, it can be divided into steam pipes and hot water pipes. According to the different working pressure, the heat-supply pipeline can be divided into three types: low pressure, medium pressure and high pressure pipelines. According...

Welded steel pipes, also known as seamed steel pipes, are generally made by coil weld with steel plates or band steel. Classification according to the surface treatment of pipes Welded steel pipes can be divided into galvanized and non-galvanized steel pipes. The galvanized surface of the...

The seamless steel pipe can be divided into the following five categories. 1. Seamless carbon steel pipe Commonly used manufacturing materials are 10, 20, 16Mn steel. The specification of the pipe is as follows: Hot rolling outer diameter: φ32-630mm. Cold drawing outer diameter: φ6-200mm. Single pipe...

23Mn (Q345B) steel pipe is a low-alloy high-strength structural steel with carbon content of 0.1%-0.25%, and main alloying elements such as manganese, silicon, vanadium, niobium and titanium are added. Its total alloy content is less than 3%. Grade A and B steels are usually called 16Mn16mn steel pipes....

There are several inspection methods: Tensile test On the tensile testing machine, the following results can be obtained by stretching the sample: Yield point (yield strength): Under the force of the tensile machine, the specimen is stretched. At the beginning, the elongation of the specimen is proportional to the...

Seamless steel pipe is a steel pipe without welding seam manufactured by hot processing methods such as perforated hot rolling. If necessary, the hot-processed tube can be further cold-processed to the required shape, size and performance. At present, seamless steel pipes (DN15 - DN600) are the most widely used pipes in...

The development of steel pipe technology began with the rise of bicycle manufacturing. It strongly promotes the development of steel pipe industry in terms of variety, output and quality due to the development of oil in the early 19th century, the manufacture of ships, boilers and planes during two world wars, including...

According to the use and pipe materials, the commonly used connection methods for building pipeline are: ① threaded connection, ② flange connection, ③ welded connection, ④ groove connection (hoop connection), ⑤ cartridge connection, ⑥ hot melt connection, ⑦ socket connection. This article explains in detail the standard...

How to connect the whole valve with the pipeline or equipment, this problem can not be ignored, because the running, bubbling, dripping and leaking of the valve mostly occur in connection parts. 1. Flange connection Flange connections are the most used form of connection between valves and piping or equipment. It refers...

When the chromium-nickel austenitic stainless steel is heated to a temperature range of 450-800 °C, corrosion along the grain boundary often occurs, which is called intergranular corrosion. Generally speaking, intergranular corrosion is actually caused by the precipitation of carbon from the saturated austenitic metallurgical...