The annealed state is a kind of seamless steel pipe delivery state, that is, the steel pipe is annealed and heat-treated before leaving the factory. A metal heat treatment process in which the metal is slowly heated to a certain temperature, maintained for a sufficient time, and then cooled at an appropriate rate (usually slow cooling, sometimes controlled cooling).

Seamless steel pipes have a hollow cross-section and are widely used as pipes for transporting fluids, such as pipes for transporting oil, natural gas, gas, water, and certain solid materials. After the seamless steel pipe is put into use, because external factors will cause the steel pipe to block and produce stains, it is necessary to maintain and clean the steel pipe

The surface heat treatment of seamless steel pipe is a metal heat treatment process that changes the mechanical properties of the surface layer by heating and cooling the surface of the steel pipe. Surface quenching is the main content of surface heat treatment, and its purpose is to obtain a high-hardness surface layer and favorable internal stress distribution to improve the wear resistance and fatigue resistance of steel pipes.

The annealing of seamless steel pipe is a metal heat treatment process, which refers to slowly heating the metal to a certain temperature, keeping it for a sufficient time, and then cooling it at an appropriate speed.

Stainless steel seamless steel pipes are widely used in high-pressure, low-temperature and corrosion-resistant environment piping systems. Mechanical properties, process properties and corrosion resistance are three important indicators to measure the quality of steel pipes, and are also important guarantees for safe navigation of ships. So how to avoid surface quality problems?

The insulation pipe is mainly composed of three layers, one layer is a protective shell made of high-density polyethylene or fiberglass, one layer is an insulation layer made of rigid polyurethane foam, and a layer of working steel pipes, which can be transported according to the medium. Welded steel pipes, seamless steel pipes, and double-sided submerged arc spiral steel pipes are used for different requirements.