Engineering structure welded steel pipe is suitable for the construction of boilers, pressure vessels, ships, Bridges, factory buildings, geological oil drilling, laying oil and gas pipelines and other projects of structural steel pipe, including seamless steel pipe for engineering structure, and alloy steel pipe. Most of these steels have to be welded, so it is generally low carbon steel with a carbon content of less than 0.25%, and it is mostly used in hot rolled or normalized state, and only part of the alloy steel is used after heat treatment. Commonly used engineering structure welded steel pipes are general engineering carbon structure steel plate, steel strip, steel pipe, steel pipe, boiler and pressure vessel with seamless steel pipe, and alloy steel plate, steel strip steel pipe, reinforced concrete with non-alloy steel, wire and rebar, bridge plate, steel, shipbuilding with seamless steel pipe, and alloy steel plate, steel pipe, etc.

Welded steel pipe for engineering structure

What is the mechanical structure steel pipe and its main use?

Mechanical structure steel pipe is suitable for the manufacture of machinery and mechanical parts of the steel pipe. This kind of steel usually needs to be used after tempering treatment and surface hardening treatment, mainly including tempered structural steel. Surface hardened structural steel, cold plastic forming steel, spring steel, etc., in short, including all non-alloy steel and alloy steel for mechanical construction. Commonly used steel for mechanical structure are carbon structural steel bar, steel plate, steel strip, steel pipe, alloy structural steel bar, steel plate, steel pipe, steel wire non-alloy and alloy spring steel bar, steel plate, steel strip, steel wire, cold heading and cold top forging steel bar, steel wire, as well as aviation, aerospace, weapons, automobiles and other special mechanical structure steel.

Alloy structural steel welded steel pipe and what are its types?

Welded steel pipe Welded steel pipe refers to the alloy steel used to manufacture machine and mechanical structure parts, is on the basis of high-quality carbon steel, appropriate to add one or several alloying elements made of these elements are mainly used to improve the strength of steel, toughness and hardenability. The carbon content of welded steel pipes is generally 0.08%~0.55%, and the alloying elements often added are manganese, silicon, chromium, vanadium, titanium, nickel, molybdenum, tungsten, aluminum and so on. According to the basic composition of chemical composition series can be divided into Mn series steel, SiMn series steel, Cr series steel, CrMn series steel, CrNiMo series steel, Ni series steel B series steel and so on. Alloy structural steel welded steel pipe can be divided into tempered steel, surface hardening steel (carburizing steel, nitriding steel, surface high-frequency hardening steel, etc.) cold plastic forming steel (cold forging steel, cold extrusion steel, etc.) according to the different heat treatment process and use.