Automatic Steel Pipe Induction Annealing Machine

In recent years, with the upgrading of high-precision steel pipe processing and green manufacturing standards worldwide, induction annealing technology has become the core process for eliminating internal stress, optimizing metallographic structure, and improving the toughness and plasticity of seamless and welded steel pipes. The melting power supply, as the core energy component of steel pipe induction annealing machines, directly determines heating uniformity, production efficiency and energy consumption indicators. Facing widespread technical confusion in on-site equipment selection, commissioning and operation in the industry, professional technical teams have sorted out core technical Q&As to solve practical production pain points.

A: Industrial-grade steel pipe annealing is mainly matched with induction medium frequency heating power supply with a frequency range of 1kHz–20kHz. Different from high-frequency power supplies that focus on surface rapid heating, medium-frequency power supplies utilize the thermal penetration effect of alternating magnetic fields to achieve uniform internal and external heating of steel pipes. It thoroughly eliminates residual stress generated during rolling and welding, avoids surface overheating and internal under-heating defects, and adapts to continuous annealing production of steel pipes with diameters from 2mm to 762mm and wall thicknesses of 0.2mm to 50mm.

A: Traditional IGBT and silicon MOSFET power supplies have limitations in high-temperature resistance and power density. The upgraded SiC-MOSFET melting power supply features outstanding performance: its theoretical operating temperature reaches 600℃, four times that of traditional devices, adapting to harsh high-temperature workshop environments. With higher thermal conductivity and power density, it simplifies the heat dissipation system, realizing equipment miniaturization and lightweight design. Meanwhile, the power conversion efficiency is increased by 8%–12%, effectively reducing production energy consumption and meeting global green production requirements.

A: The mainstream industrial melting power supply adopts modular integrated design, with independent protection functions for over-current, over-voltage and overheating. The simplified circuit structure reduces failure points, and modular components support quick replacement, greatly shortening maintenance time. For long-term continuous annealing production lines, regular inspection of capacitor banks, cooling systems and induction coil matching status can ensure stable long-term operation of the equipment and extend the service life of the power supply.