Germany has developed a technique called thermomechanical treatment (TMT) that imparts excellent fine-grained microstructure on low alloy steels. This technique decreases the number of microstructural defects resulting in stronger and tougher pipes. The process of tempering and quenching steels makes them stronger while reducing brittleness. This process enables manufacturers to produce a variety of steel pipes, with excellent properties and in wide range of sizes. Steel grade is a designation given to different steel grades according to their chemical composition and mechanical properties. There are different steel grades available for steel pipes such as stainless steel, alloy steel and carbon steel.
S355J2 is one such grade of steel that is known to have excellent quenching and tempering properties. S355J2 is a low alloy steel with a fine grain structure and it is suitable for producing welded pipes at high temperatures. It is widely used in the production of pipes for pressure vessels, construction and mining applications as well as in automotive and aircraft parts.
This grade of steel is used in the production of seamless steel pipes in Germany. Seamless steel pipes are produced by rolling the hot steel over a mandrel in a series of rollers until the desired diameter is achieved. The circular shape and thin wall of the pipe make it ideal for pipe transport, as they are very hard to bend and require little space for storage. The seamless steel pipes produced with S355J2 steel grade have excellent mechanical properties, excellent weldability and great corrosion resistance.
The material used in the manufacture of seamless steel pipes is tested rigorously for any defects, including defects caused due to microstructure. This is done with mechanical testing and chemical analysis of the steel. The tensile strength, yield strength and hardness of the pipes are tested. The chemical composition of the steel is also analyzed to ensure that it conforms to the requirements of the particular application it is meant for, like pressure vessels, boilers, construction, etc. The tests also ensure that the pipes are able to withstand extreme temperatures and dynamic pressures.
The S355J2 steel grade has high strength, ductility and excellent weldability features. It is known for its ability to resist corrosion and for being highly resistant to cracking at elevated temperatures. The combination of strength and ductility enables it to be used in the production of various types of seamless steel pipes. The seamless steel pipes produced with this grade of steel are predominantly used in marine, oil and gas, as well as industrial applications.
Germany is one of the leading countries in the production of seamless steel pipes, and S355J2 is one of the major grades of steel used in the production of these pipes. The steel grade has excellent properties including strength, toughness, weldability and hardenability, making it an ideal choice for the production of a wide variety of seamless steel pipes.
