We Super Steel Manufacturing Co.,Ltd(SMC) are amongst the top manufacturers and suppliers for the seamless steel pipe, welded steel pipe, OCTG products and fittings from China. We have been manufacturing and supplying these products to the industry since 1993, and received repeat orders and appreciation from our valued customers.
High quality piping products from approved manufacturers.
In order to continuously improve our offerings to our clients, we have consistently improved and upgraded our manufacturing facility and can hence offer material with stringent requirements.
Over the years, Super Steel Manufacturing Co.,Ltd(SMC) has developed an enviable reputation for project management for the Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical and other heavy industries.
The many years of experience that we have means that there is always someone who has the ability to carry a project forward.
Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
To ensure the structural integrity and performance of LSAW (Longitudinal Submerged Arc Welding) steel pipes, a carefully designed heat treatment process is essential. Proper heat treatment reduces internal stresses, minimizes deformation, and enhances the overall durability of the pipes. The following steps outline a recommended approach for the heat treatment of LSAW steel pipes.
Material Selection:
Choose a high-quality, low-deformation material suitable for LSAW steel pipes. For steel with severe carbide segregation, it is essential to perform an appropriate heat treatment to mitigate this issue. For larger or complex LSAW pipes that are challenging to heat treat uniformly, solution treatment and refinement processes may be necessary. Controlling the heating temperature and rate, especially by preheating slowly, helps reduce deformation during the heat treatment process.
Proper Heat Treatment Process and Operations:
Following a precise heat treatment procedure is critical to minimize distortion in LSAW pipe joints. The causes of deformation can be complex, but by understanding the factors contributing to it, the appropriate methods can be applied to avoid unusual deformations. Correct process control enables effective management of distortion.
Stress Relief Pre-Heat Treatment:
Pre-heat treatment helps relieve residual stress accumulated during machining. Where feasible, cryogenic vacuum heat treatment or quenching after cryogenic treatment can be applied to LSAW steel pipes. When hardness requirements permit, graded quenching or austempering is recommended to control cooling and reduce deformation.
Design Considerations:
LSAW steel pipes should be designed with balanced thickness and symmetrical shapes to reduce deformation. For complex or high-precision LSAW steel pipe components, pre-heat treatment, aging, quenching, and nitriding can enhance dimensional stability. Small, precise repair techniques like cold welding are advisable for fixing defects such as porosity or wear, as they minimize the heat-affected zone and reduce deformation risks.
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