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The heat treatment of carbon steel pipe

Carbon steel pipe as a product must have a certain performance to meet the needs of the usage conditions.

Improving the performance of the steel is two ways, First, adjusting the chemical composition of the steel alloying; the other is the heat treatment, heat treatment and shaping deformation combination of approaches. In the field of modern industrial technology, heat treatment to improve the performance of the steel still occupy a dominant position. A wide range of steel pipe, and the appropriate standard for handling, the use of steel vary, sometimes according to their own needs but also to add additional conditions. In the standard, as one of the terms of delivery performance must meet the requirements. The performance of the steel pipes mainly refers to the mechanical properties, physical properties, the use of performance and process performance. Heat treatment by heating, insulation and cooling the steel to obtain the microstructure and corresponding to a variety of performance to meet product standards and requirements of users.

Heat treatment of carbon steel pipe can be divided into three categories, the final heat treatment processes in order to meet the performance requirements, the heat treatment that the user required to heat treatment delivery, and steel manufacturing process (heat treatment). With other products, product standards and technical conditions required to the steel pipe commonly used in heat treatment process of hardening, tempering, normalizing and annealing. Such as: oil pipe in the casing, tubing, drill pipe, line pipe, etc., according to the level of the steel grade, it is correspondingly normalizing, normalizing plus tempering, quenching and tempering process; high-pressure boiler tubes, high pressure chemical fertilizer pipeline often used normalizing, normalizing plus tempering, quenching and tempering (thick-walled tubes) and solution treatment of austenitic stainless steel; bearing steel pipe ball annealing. Some higher alloy content steel pipe, in order to prevent the user to cracking, deformation, etc., users and standards typically require the production plant to heat treatment delivery, production plants are required, such as annealing, normalizing heat treatment. Between the heat treatment process for cold-rolled, cold drawn steel pipe production process, usually the recrystallization annealing, softening annealing. The aim is to eliminate the cold work hardening effect, reduce hardness and improve toughness in order to facilitate further cooling the deformation process to be implemented.


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