Ultrasonic Testing (UT) Technology For Steel Pipe & Steel Plate Quality Inspection

Ultrasonic Testing (UT) is one of the most important, efficient, and widely used non-destructive testing (NDT) methods in the steel industry. It is applied to inspect internal integrity of steel plates and steel pipes, ensuring raw material consistency, structural safety, and compliance with international project standards.

Unlike destructive testing, UT inspection does not damage the finished products. It allows 100% full-volume detection before shipment to eliminate internal defects that cannot be observed by visual inspection. Below is a clear and professional introduction to our ultrasonic testing process, principles, standards and technical advantages for your reference and incoming quality verification.

1. Testing Principle of Ultrasonic Inspection

Ultrasonic Testing uses high-frequency sound waves to penetrate steel materials. When ultrasonic waves propagate inside the steel body, they reflect echoes once encountering internal defects such as cracks, inclusions, pores, or delamination.

Our professional UT equipment receives and analyzes the reflected signals to accurately judge the position, size, depth and type of internal defects. This technology realizes high-precision internal quality detection and ensures the compactness and uniformity of steel microstructure.

2. Applicable Products & Inspection Scope

Our factory applies strict ultrasonic testing for all exported steel plates and steel pipes, especially for products used in high-pressure, petrochemical, pipeline, structural and marine engineering scenarios.

Main inspection scope includes:

Internal lamination and layered defects in steel plates

Internal cracks, porosity and shrinkage cavities in steel pipe bodies

Non-metallic inclusions and material unevenness

Hidden internal defects after rolling and forming

Full body detection of seamless steel pipes and welded steel pipes

3. Executive International Standards

All ultrasonic testing procedures are strictly implemented in accordance with internationally recognized standards to ensure consistency with global engineering acceptance requirements:

ASTM A388 / A388M (Standard Practice for Ultrasonic Examination of Steel Forgings and Plates)

ASTM E165 (Standard Practice for Ultrasonic Testing)

EN 10160 (Ultrasonic testing of steel plate flat products)

API 5L (UT inspection standard for line pipes)

ISO 16810 / ISO 16811 (General principles and sensitivity levels for ultrasonic testing)

We can fully match the standard grade and sensitivity level required by your project and provide corresponding official test reports.

4. Our UT Inspection Process

To ensure stable and reliable product quality, we implement standardized and repeatable ultrasonic testing procedures:

Step 1: Surface Preparation Clean the steel surface to remove rust, dust, oil and burrs to ensure stable ultrasonic coupling effect and accurate signal transmission.

Step 2: Instrument Calibration Professional UT inspectors calibrate the testing instrument with standard test blocks before each batch inspection to guarantee detection accuracy and sensitivity.

Step 3: Full Scanning Detection Carry out full coverage scanning on steel plate surface and steel pipe body, including longitudinal and transverse scanning, to avoid missing any potential defects.

Step 4: Defect Evaluation & Recording Echo signals are analyzed in real time. If any unqualified defect exceeding the standard tolerance is found, the product will be marked, isolated and rejected immediately.

Step 5: Report Issuance Complete inspection records and issue official ultrasonic testing reports for each batch of qualified goods, which can be used for customer customs clearance, project acceptance and third-party audit.

5. Technical Advantages of Our Ultrasonic Testing

High Precision: Able to detect tiny internal defects with high resolution, ensuring material internal compactness.

Full Volume Detection: Realize overall inspection instead of random sampling, greatly reducing quality risk.

Safe & Non-Destructive: No damage to products, no radiation, safe for operators and environment.

Real & Traceable Data: All testing data and waveforms are recorded completely, supporting full quality traceability.

Third-Party Recognizable: Our UT inspection standards and reports are fully compatible with SGS, BV and other international third-party inspections.

6. Quality Commitment

All steel plates and steel pipes delivered by our factory have passed strict ultrasonic testing. We strictly control internal material defects to ensure that every batch of products meets international industry standards and customer technical requirements.

We support customer on-site inspection and third-party NDT verification before shipment. If you have special requirements for ultrasonic testing sensitivity, scanning method or testing range, we can fully customize the inspection scheme according to your project standard.