ADDITIONAL MECHANICAL TESTING

BEND TEST, JOMINY END QUENCH TEST, HYDROGEN EMBRITTLEMENT & MORE

At Zhejiang Guojian Testing Technology Co., Ltd (CCT) , we offer comprehensive mechanical testing services, which include destructive testing and test specimen machining. Our state-of-the-art facility located in China provides a complete range of mechanical testing services to help you evaluate and confirm the properties and traits of your materials.

Apart from the services mentioned on other pages of our website such as tensile testing, stress rupture, fatigue, impact, hardness and fracture toughness, we also offer additional mechanical testing for metal materials, including the following:

· Bend Test

· Tube Testing – Flattening / Flanging Test, Flaring

· Proof Load Testing

· Shear Testing

· Compression

· Hydrogen Embrittlement Testing / Stress Durability Test

· Jominy Test / Jominy End Quench Test

More services required for Fastener Testing and Welder and Procedure Qualification are also available.

TEST SPECIMENS FOR MECHANICAL TESTING

Our full-service mechanical testing lab offers services to fully assess the mechanical properties of your metallic materials, including strength, hardness, ductility, impact resistance, fracture toughness, elongation and stress. To ensure quick and convenient testing, our highly trained and skilled machinists can prepare your specimens for all types of mechanical testing, in accordance with ASTM standards A370, E8, E23 and customer specifications. Zhejiang Guojian Testing Technology Co., Ltd (CCT) is also PRI/Nadcap accredited for specimen preparation, ensuring the highest level of quality and accuracy in all our testing services.

TEST METHODS/SPECIFICATIONS

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THE TEST PROCESSES

Bend Test
The ductility of a material can be evaluated by performing a bend test, which involves bending the specimen over a certain radius. Some material specifications require the specimen to be bent to a specific inside diameter. This type of test is typically carried out on plates, pipes, and other component products. When assessing welds using the bend test, the results are expressed in terms of fiber elongation. Flaring, flattening, and cone strip testing are additional methods used to assess strength and ductility under varying conditions.

Proof Load Testing

Proof load testing is a method used to determine the strength of materials, and is often synonymous with yield strength. During this test, tension or load is applied to the test specimen to observe whether any deformation occurs. Test standards may include tension or compression testing methods. Proof load testing is commonly performed on bolts, nuts, components, assembled products and other load-bearing materials. We offer a range of other mechanical testing services for fasteners as well.

Hydrogen Embrittlement / Stress Durability

Hydrogen embrittlement occurs when hydrogen is trapped within a material during physical or chemical changes like corrosion or treatments, causing a reduction in ductility and potential cracking or breaking. To test for hydrogen embrittlement, a specific load or torque is applied to a specimen or fastener, which is then left for a specified time. Afterward, the test piece is retightened, and if any breakage occurs before or during retightening, hydrogen embrittlement is present. 

Stress durability testing is used to evaluate the durability of parts that have undergone any processing operation or treatment that could potentially cause embrittlement. The parts are loaded to a value greater than the expected service load and held at that load for a specific duration. After removing the load, the specimen or fastener is examined for any cracking or breakage.

Jominy End Quench Test

To determine the hardenability of an alloy, a Jominy End Quench Test, also known as a Jominy Hardenability Test, is conducted. This test measures the alloy's ability to harden to a certain depth under specific conditions. The results of the test provide crucial information for selecting the right combination of alloy steel and heat treatment for the production of components of varying sizes, with the goal of minimizing thermal stresses and distortion. The Jominy End Quench Test involves heating the specimen, quenching it, grinding a flat surface, and then taking hardness measurements at different points along the sample.