Molybdenum mandrel plug for piercing seamless steel pipe

The production of molybdenum mandrel plugs typically involves a combination of machining, metal forming and finishing processes. The following are typical steps involved in the production method:

Raw material selection: Select high-quality molybdenum rods or rods as raw materials for the production of mandrel plugs. Molybdenum was chosen for its high melting point, strength and corrosion resistance, making it suitable for applications requiring high temperatures and mechanical properties. Machining: The molybdenum rod is machined to form the initial shape of the mandrel plug. This may involve turning, milling or drilling operations to obtain the required dimensions and surface properties.  CNC (computer numerical control) machining allows for precise shaping and cutting. Metal Forming: A machined molybdenum blank is then subjected to a metal forming process such as bending, swaging or extrusion to create the specific features and contours of the mandrel plug. For example, if a tapered or conical shape is required for a mandrel plug, metal forming techniques are used to achieve the desired geometry. Heat treatment: After forming and shaping, the molybdenum mandrel plug can undergo a heat treatment process to enhance its mechanical properties such as strength and hardness. High temperature annealing or sintering can be used to optimize the microstructure and eliminate residual stresses. FINISHING: Molybdenum mandrel plugs undergo a finishing operation to ensure dimensional accuracy, surface smoothness and eliminate any defects. This may include polishing, grinding or other surface preparation methods to achieve the required surface finish and geometric tolerances. Quality Control: Throughout the entire production process, quality control measures are implemented to inspect and verify the dimensional accuracy, material integrity and overall quality of the molybdenum mandrel plugs. Non-destructive testing methods, dimensional metrology and visual inspection may be used to ensure compliance with specifications. By following these production steps, manufacturers can produce molybdenum mandrel plugs with the characteristics and performance attributes required for their intended application. 

Molybdenum mandrel plugs are commonly used in the seamless pipe and pipe manufacturing industry. These plugs are inserted into hollow workpieces (tubes or pipes) during the manufacturing process to ensure dimensional accuracy and prevent defects such as ovality or waviness. The molybdenum material was chosen for its high strength at high temperatures, resistance to corrosion, and ability to withstand the high temperatures and pressures involved in the pipe manufacturing process. Specific applications for molybdenum mandrel plugs include: Seamless pipe production: Molybdenum mandrel plugs are used in the production of seamless pipes as forming tools to maintain the inner diameter and surface quality of the workpiece. These mandrel plugs are critical to guide and support the workpiece to achieve the desired dimensions and surface finish as it undergoes the thermal piercing, stretching and rolling processes. Hot rolling and piercing: During the hot rolling and piercing process, molybdenum mandrel plugs are used to prevent the formation of wrinkles, eccentricity and surface defects in seamless pipes. By providing internal support and shaping, mandrel plugs help ensure the production of high-quality, uniform products with consistent dimensions. High Temperature Environments: Using molybdenum mandrel plugs is particularly beneficial in high temperature manufacturing environments, where the material’s high melting point and excellent thermal properties allow it to withstand the extreme conditions encountered during pipe production.

Overall, molybdenum mandrel plugs play a key role in ensuring the dimensional accuracy, surface quality and integrity of seamless tubing, ultimately helping to produce high performance for various industries such as automotive, aerospace, oil and gas, etc. product department.

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