English
русскийCommonly used inspection methods for stainless steel seamless pipes mainly include the following:
Chemical Composition Analysis:
Infrared C-S Analyzer: Used for analyzing C and S elements in ferroalloys, raw materials for steelmaking, and steel.
Direct Reading Spectrometer: Analyzes various elements in bulk samples, such as C, Si, Mn, P, S, Cr, Mo, Ni, etc.
N-O Analyzer: Used for analyzing gas content, such as N and O.
Geometric Dimensions and Shape Inspection of Steel Pipes:
Steel Pipe Wall Thickness Inspection: Tools such as micrometers and ultrasonic thickness gauges are used to measure and record at no fewer than eight points at both ends.
Steel Pipe Outer Diameter and Ovality Inspection: Maximum and minimum points are measured using calipers, vernier calipers, and ring gauges.
Steel Pipe Length Inspection: A steel tape measure is used, and measurements can be taken manually or automatically.
Steel Pipe Bend Inspection: A straight ruler, spirit level (1m), feeler gauge, and fine line are used to measure the bend per meter and the total bend.
Steel Pipe End Bevel Angle and Blunt Edge Inspection: Tools like protractors and templates are used for this inspection.
Surface Quality Inspection of Steel Pipes:
Manual Visual Inspection: Inspections are carried out under good lighting conditions according to standards and experience.
Nondestructive Testing:
Ultrasonic Testing (UT): Sensitive to surface and internal cracks in materials, following the GB/T5777-1996 standard, level C5.
Eddy Current Testing (ET): Based on electromagnetic induction, mainly detects point (hole-shaped) defects, adhering to the GB/T7735-2004 standard, level B.
Magnetic Particle Testing (MT) and Magnetic Flux Leakage Testing: Suitable for detecting surface and near-surface defects in ferromagnetic materials, following the GB/T12606-1999 standard, level C4.
Electromagnetic Ultrasonic Testing: Does not require coupling media, suitable for high-temperature, high-speed, and rough steel pipe surface testing.
Penetrant Testing: Uses fluorescent or color methods to detect surface defects on steel pipes.
Mechanical and Physical Performance Testing of Steel Pipes:
Tensile Test: Measures stress and deformation to determine the material's strength and plasticity indicators.
Impact Test: Assesses the material's performance under impact loads.
Hardness Test: Measures the material's hardness, such as Brinell hardness, Rockwell hardness, and Vickers hardness.
Hydraulic Test: Tests the performance of the steel pipe under pressure.
Process Performance Testing of Steel Pipes:
Flattening Test: Evaluates the deformation capacity of the steel pipe under compressive load.
Ring Tensile Test: Tests the ring tensile performance of the steel pipe.
Flaring and Flanging Tests: Simulate the flaring and flanging process of the stainless steel seamless pipes in actual use.
Bending Test: Assesses the performance of the steel pipe under bending load.
Other Specific Testing:
Salt Spray Test: Simulates marine or other corrosive environments to test the corrosion resistance of stainless steel seamless pipes.
Air Tightness Testing: Checks the airtightness of the steel pipe to ensure it does not leak air.
These inspection methods provide comprehensive means for quality control of stainless steel seamless pipes, ensuring that the products meet relevant standards and requirements during manufacturing and use.
