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...

Pure chromium ferritic stainless steel has no significant increase in hardness after quenching. During the forging process, work hardening will occur and the hardening degree varies with temperature and shape variables. This kind of steel has no rigorous requirement for the cooling temperature after forging. Ferritic stainless...

Stainless steel is widely used in chemical industry, petroleum industry, power plant, etc., and many products require not only corrosion resistance, but also high strength, so most stainless steels are used after forging. Compared with carbon steel, stainless steel has characteristics such as low thermal conductivity,...

Overheating If steel materials stay for too long in the high-temperature furnace, their grain will gradually grow and become coarse crystal. This phenomenon is called overheating. Overheating is related to heating temperature and heating time. The higher the heating temperature, the longer the time, the coarser the crystal...