Seamless Steel Pipe Quality Control Guidelines: Key Points to Avoid in Three Critical Stages

I. Raw Material Selection: The Foundation of Quality

 

Chemical Composition: Strictly control harmful elements such as As, Sn, and Sb (within national standard limits)

Surface Inspection: Magnetic particle testing to detect folds and cracks (subsurface bubbles ≤ 0.5 mm)

Process Optimization: Electroslag remelting process to enhance material purity

 

 

2. Production Control: Solutions for Common Defects

Folding Defects

Characteristics: Straight/spiral-shaped continuous patterns

Countermeasures: 100% billet grinding inspection

 

Crack Issues

Main Causes: Subsurface bubbles or cold drawing marks

Solutions: Install online eddy current testing equipment

 

Surface Scratches

Root cause: Mold adhesion

Improvement: Use HRC62+ tungsten steel molds

 

3. Quality Inspection: Modern Testing Methods

 

Dimension control: Laser diameter gauge (±0.01mm) + ultrasonic thickness measurement

Surface inspection: Machine vision system (detects defects as small as 0.1mm²)

Performance verification: Metallographic analysis + low-temperature impact testing

Industry case: A certain factory reduced mold wear by 40% and defect rates by 60% through infrared temperature control (±15°C) and new lubricants.

 

(Interactive) What steel pipe quality issues have you encountered? Feel free to leave a comment and share your experiences!

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