With the continuous development of China's economy, the country vigorously develops the energy industry. Long-distance oil and gas pipelines are an important way of energy security. In the process of anti-corrosion construction of oil (gas) pipelines, the surface treatment of steel pipes is the key factor determining the service life of pipelines. First, it is the premise of whether the anti-corrosion layer and the steel pipe can be firmly combined. According to the research institute's verification, the life of the anti-corrosion layer depends on the coating type, coating quality and construction environment. The surface treatment of the steel pipe affects the life of the anti-corrosion layer by about 50%. Therefore, it should be strictly in accordance with the anti-corrosion layer specification. The requirements of the surface of the steel pipe are continuously explored and summarized, and the surface treatment method of the steel pipe is continuously improved.

Stainless steel pipes of United Steel Industry Co., Ltd. are divided into ordinary carbon steel pipes, high-quality carbon structural steel pipes, alloy structural pipes, alloy steel pipes, bearing steel pipes, stainless steel pipes, and bimetallic composite pipes for saving precious metals and meeting special requirements. Plating and coating tubes, etc. Stainless steel tubes are available in a wide variety of applications, with different technical requirements and different production methods. The outer diameter of the currently produced steel pipe ranges from 0.1 to 4500 mm and the wall thickness ranges from 0.01 to 250 mm. In order to distinguish the characteristics, the steel pipes are usually classified as follows.

The main cause of corrosion in large diameter welded pipes

High-precision steel pipes In the conventional quenching method, the cold wind speed is not as fast as oil cooling, and is also lower than the isothermal and graded quenching molten salt. Therefore, increasing the pressure in the refrigerating chamber, increasing the flow rate, and applying the molar mass ratio of nitrogen to argon gas and hydrogen are common developments in vacuum absorption technology today. The vacuum carbonization temperature is generally higher than that of conventional gas carbonization. Usually, the penetration and diffusion of 920~1040 °C can be shown in two stages. It can also be used for pulse ventilation, heat preservation and multi-phase dispersion dispersion. The effect is better due to high temperature, especially surface. The clean, active, and vacuum carbonized layer formation rate is faster than conventional gas, liquid, and rapid carbonization. This is a reinforcing material, especially the use of heat treatment to strengthen the material, which is a more important means. Second, the cold deformation enhancement contributes to the uniformity of the metal deformation, because the deformed portion of the precision steel tube is hardened, and the portion where the deformation or deformation is small continues to develop. Third, the cold deformation strength can improve the safety of the member during use, and when the member is overloaded, plastic deformation occurs, thereby preventing the member from suddenly breaking due to strength.

Always in pipeline systems we met the material with NACE MR0175/ISO 15156 pipe or fittings, so do you really know what is the major differences between NACE carbon pipe and normal carbon steel pipe? And how is the cost for nace material?