NDT Test Block
YUSHI Instruments:Leading Innovation in NDT instruments
Yushi Instruments is a high-tech R&D-centered enterprise dedicated to providing high-quality ultrasonic testing (UT) equipment to the world. The company was founded in 1985 (formerly known as Shenyang Flaw Detection Machine Factory) and officially established in 2011. After more than a decade of dedicated innovation, we have grown to become a leader in China's non-destructive testing (NDT) industry. Our award-winning, multi-patented products such as the 2024 PM5 Gen2 and 2025 PM5 Gen3 Ultrasonic Thickness Gauge have received national patents and international certifications, fully reflecting our commitment to excellence.
YUSHI now has developed 8 categories of NDT products:
| Ultrasonic Thickness Gauge | Ultrasonic Flaw Detector |
| Ultrasonic Pulse Generator and Receiver | Coating Thickness Gauge |
| LEEB Hardness Tester | Industrial LED Film Viewer |
| Black and White Densitometer | UV NDT Lamp |
Why Choose YUSHI?
We offer a variety of precise testing instruments
Keep Technical Innovation
Rich experience of R&D and strong abilities drive the development of ultrasonic thickness solutions like the PM5 Gen2 and PM5 Gen3.
Customer's Requirement Oriented
We listen the real requirements from our all customers, from end users to distributors,treating every need with equal importance.
Customized Solution
We offer customized instruments and accessories based on our clients' specific needs.
Throughtful Service
Our commitment extends far beyond delivery, encompassing vital after-sales services including maintenance, calibration, and software updates.
Comprehensive Overview: YUSHI Ultrasonic Calibration Test Blocks
Key Advantages of YUSHI Test Block
YUSHI ultrasonic test blocks provides outstanding advantages that help users to keep high accuracy for the material inspection. These characteristics ensure reliable performance and accurate calibration results for various ultrasonic testing.
High Precision
YUSHI manufactures the calibration blocks with strict standard. That brings the blocks with low tolerance. For step blocks, the step thickness tolerance is ±0.001in.
01
Factory Certificate
Every YUSHI test block comes out with certificate, which can provide reliability and confidence for the users.
02
Support Customization
YUSHI supports the customization of test blocks. Users can customize the material, height, number of steps, diameter of holes and other specifications for step blocks and calibration blocks.
03
Compliance with Standard
Normal blocks are in accordance with ISO,AWS ,ASTM standard.For special test blocks like IIW2, they conform to ISO 7963, while other blocks meet other standards including British standard BS2704,German standard DIN54-120,Australian standard AS2083.
04
Test Blocks Model Range
Step Test Block
4-Step Test Block
5-Step Test Block
6-Step Test Block
7-Step Test Block
8-Step Test Block
10-Step Test Block
Curved 5-Step Test Block
Double 4-Step Test Block
Cylindrical Test Block
NDT Calibration Block
IIW Type 1 Block
IIW Type 2 Block
IIW2/V2/A4 Block
DSC Block
IOW Block
DC Block
Test Block Material Selection
YUSHI provides test blocks in various material to match different usage requirements.
1. Carbon Steel(1018 Steel): This is the standard material for most of YUSHI test blocks, which is known for its standard acoustic characteristics and durability. Carbon steel test blocks are most widely used in Ultrasonic testing and inspection.
2.Stainless Steel(304 Stainless Steel): This kind of material provides excellence corrosion resistance, making the stainless steel an ideal material for harsh environment or applications with high demand of rust prevention.
3.Aluminum Alloys(6063 and 7075):Test blocks made of Alluminum alloys have great acoustic transmission and have lighter weight than the steel test blocks.
4.Special Alloys:Special alloys such as 6AL4V Titanium can be used in specific applications. These special alloys combine high strength with corrosion resistence.
Choosing the right block material is crucial, as acoustic properties (including sound velocity and attenuation characteristics) vary with the material. Proper material matching ensures calibration accuracy when testing components made of specific materials. YUSHI supports users in customizing test blocks with special materials to meet different usage environments and specific requirements.
Critical Importance of Selecting Proper Test Block
Instrument Calibration:Ultrasonic thickness gauges and flaw detectors need to be calibrated rely on the standard test blocks. Without accurate calibration as reference, the measuring error will occur.
Sound Velocity Calibration: Different materials possess distinct acoustic propagation characteristics. Using test blocks that match the acoustic properties of the material being measured ensures accurate sound velocity calibration of the instrument, which is crucial for thickness measurement or flaw detection.
Industry Standard Compliance: Numerous industries adhere to strict quality standards, requiring regular calibration of instruments using certified reference blocks. The test blocks produced by YUSHI comply with internationally recognized standards such as ISO, ASTM, and AWS, assisting enterprises in meeting these compliance requirements.
Establishment of reference sensitivity: This is one of the most critical functions of the test block. Reference sensitivity is the baseline gain level set using a specific artificial reflector (such as a flat bottomed hole or side drilled hole) in the test block to standardize the detection capability of the ultrasonic flaw detector.
DAC/TCG Curve Generation: Test blocks with multiple reflectors at different depths are essential for creating distance amplitude correction (DAC) or time correction gain (TCG) curves. These curves compensate for the natural attenuation of sound waves over distance, ensuring that defects of the same size can produce similar signal amplitudes regardless of their depth within the material.
Defect Sizing Verification: For some applications, the block comparison method is still a reliable and code approved technique for evaluating defect size, especially for defects in the near-field.
We're well-known as one of the leading ndt test block manufacturers and suppliers in China. Please feel free to buy high quality ndt test block for sale here from our factory. Contact us for more details.
Ultrasonic RC Resolution Calibration AWS block ISO CE, Type A Phased Array Block, Type DSC Block