Yuantuo Delivers a Large-Diameter Seamless Pipe Induction Heat-Treatment Line to Support Customers in Enhancing Product Performance and Production Efficiency

Hebei Yuantuo Electromechanical Equipment Manufacturing Co., Ltd. has successfully completed the manufacturing, assembly, testing, and delivery of a large-diameter seamless pipe induction quench and temper (Q&T) production line.
The system is designed for oil casing, structural pipes, pressure-bearing pipes, and other applications requiring stable mechanical performance and uniform metallurgical properties.

Project Background: A Comprehensive Solution for Heat Treatment of Large-Diameter Seamless Pipes

Large-diameter pipes used in extreme environments must meet strict requirements for hardness, toughness, wall-thickness uniformity, microstructure stability, and dimensional straightness.
Traditional heat-treatment methods often face issues such as uneven heating, deformation, overburning, and poor process consistency.

To address these challenges for pipes with diameters Ø320–Ø1000 mm, Yuantuo has developed a complete induction heat-treatment solution featuring high-power medium-frequency heating, self-rotation control, multi-zone closed-loop temperature control, and a fully traceable process management system.

Key Technologies and System Highlights

1. Medium-Frequency Induction Heating System

• Quenching power range: 750–3500 kW (0.5–4 kHz)

• Multi-zone induction coils ensure uniform inner and outer wall heating

• Real-time temperature feedback via IR pyrometers + PLC closed-loop control

2. Self-Rotating Roller Drive for Enhanced Uniformity

The specially designed double-roller system enables the pipe to rotate continuously during heating, preventing bending, localized overheating, and structural distortion.

3. Inner & Outer Wall Spray Quenching

• Ring-shaped multi-channel spray quenching

• Controlled and adjustable hardening depth

• Stable and uniform cooling for various steel grades

4. Tempering System for Stress Relief and Structural Stability

• Tempering power range: 400–1600 kW

• Provides stable microstructure and improved toughness

5. Intelligent Automation & Recipe Management

The system integrates an industrial PC with a Siemens PLC to achieve:

• Automatic recipe calling by steel grade, diameter, and wall thickness

• Closed-loop control of temperature, power, and line speed

• Real-time status monitoring and production data recording

High Throughput Capacity: 2–10 Tons per Hour

With optimized induction heating and conveyor design, the production line supports continuous Q&T processing for large-diameter pipes, achieving up to 2–10 t/h depending on pipe size and steel grade.

Customer Feedback: Stable Operation and Improved Energy Efficiency

During trial production, customers reported significant improvements in:

• Heating consistency

• Uniform hardness and toughness

• Reduced deformation

• Lower energy consumption

• Enhanced process repeatability

These results demonstrate Yuantuo’s engineering capability in providing reliable and energy-efficient induction heat-treatment equipment.

About Yuantuo Electromechanical

Hebei Yuantuo specializes in the design and manufacture of induction heating and heat-treatment systems for steel pipes, bars, plates, billets, and other metal products.
With strong in-house engineering, manufacturing, testing, and service capabilities, Yuantuo’s equipment is widely used in China and exported to Russia, Turkey, India, the Middle East, Southeast Asia, and other regions.

For more information, please visit:
www.yuantuoinduction.com (example)