What happens to the hardness of the seamless steel pipe after annealing? Increase or decrease?

The impact toughness of high-pressure seamless pipe reflects the resistance of metal to external impact load, generally expressed by impact work (Ak), and its unit is J (Joule).

There are many ways to connect two seamless steel pipes together, but generally speaking, there are two major ways: one is detachable connection, the other is non detachable connection.

The selection of seamless pipe welding method should be based on the material and wall thickness of the seamless pipe. Because different welding methods have different arc heat and arc force, different welding methods have different characteristics.

In the processing of cold-drawn precision steel pipes, there are cold hard bottoming and hydrogen embrittlement conditions, which are the key reasons for the cracking of cold-drawn seamless steel pipes.

Generally, the technical requirements for seamless steel pipes for national standard fluids mainly include chemical composition, geometric dimensional accuracy, surface quality, physical and chemical properties, etc.