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Online heat treatment enhances the mechanical properties and performance of ERW pipes. At Shijiazhuang Faith Machinery Co., Ltd, we evaluate the need for this feature based on material grades and application requirements.
When to Consider Online Heat Treatment
High-Strength Steels: API 5L X60 and above require normalizing to achieve toughness and uniform microstructure.
Stainless Steels: Annealing restores corrosion resistance after welding.
Thick-Wall Pipes: Thicknesses exceeding 8 mm benefit from stress relief to prevent cracking.
Heat Treatment Methods
Induction Heating: Precise, energy-efficient heating with temperatures ranging from 700°C to 950°C.
Cooling Systems: Air or water mist cooling controls transformation rates.
Quality Verification
Hardness testing and microstructure analysis ensure treated pipes meet standards like API 5L or ASTM A53.
While adding initial cost, online heat treatment reduces downstream processing and improves product value for critical applications.
ERW pipe production may encounter defects affecting quality and performance. Shijiazhuang Faith Machinery Co., Ltd addresses these through process optimization and preventive measures.
Frequent Defects and Solutions
Cold Welds: Insufficient heat input causes weak bonds. Solution: Increase power and reduce speed.
Ovality: Improper sizing roll adjustment. Solution: Calibrate rolls and check wear.
Weld Cracks: Rapid cooling or contamination. Solution: Implement post-weld heat treatment and improve strip cleaning.
Surface Scratches: Damaged forming rolls. Solution: Polish or replace rolls regularly.
Preventive Measures
Regular maintenance of rolls and electrodes.
Operator training on parameter adjustment and troubleshooting.
Our mills incorporate real-time monitoring and automated controls to minimize defects, ensuring high yield and compliance with international standards
