Charpy V-Notch Impact Test (CVN)
Engineering definition, metallurgical mechanisms, standard testing specifications, and manufacturing guidelines for closed-die forgings up to 50 kg.
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A standardized dynamic test that measures the kinetic energy absorbed by a notched 10x10mm specimen when fractured by a swinging pendulum hammer at specified temperatures.
Technical Explanation & Metallurgical Principles
The Charpy V-notch test evaluates a metal's resistance to brittle catastrophic fracture under rapid dynamic loading. It is critical for cryogenic and low-temperature service materials (like ASTM A350 LF2 and Duplex 2205), identifying the exact ductile-to-brittle transition temperature (DBTT).
Key Engineering Specifications & Parameters
| Technical Parameter / Metric | Engineering Benchmark / Value |
|---|---|
| Specimen Size | 10mm x 10mm x 55mm with 2mm deep 45° V-notch |
| Test Temperatures | Ambient, -20°C, -46°C, or -196°C (liquid nitrogen) |
| Result Metric | Joules (J) or Foot-Pounds (ft-lbf) + % shear area |
Application at Jayesh Forge (Rajkot Plant)
Executed in our Rajkot laboratory down to -46°C for ASTM A350 LF2 and Duplex 2205 forgings with certified MTC reporting.
Related Materials, Standards & Products
Applicable Material Grades
Engineered Product Lines
Related Metallurgical & Testing Terms
Ductile-to-Brittle Transition Temperature (DBTT)
The critical temperature threshold below which a body-centered cubic (BCC) metal loses its plastic ductility and fractures in a sudden, brittle cleavage manner.
Tensile Strength (Ultimate Tensile Strength / UTS / Rm)
The maximum tensile engineering stress that a material can withstand while being stretched or pulled before necking and fracture occur.
Brinell Hardness Testing (HBW)
A standardized hardness test that presses a 10mm tungsten carbide ball indenter into the metal surface under a 3000 kgf load to measure indentation diameter.
Questions Regarding Charpy V-Notch Impact Test (CVN)
ASTM A350 LF2 Class 1 requires an average of at least 20 Joules (15 ft-lbf) across three specimens at -46°C (-50°F), with no individual specimen below 16 Joules.
Request a Forging Quote with Charpy V-Notch Impact Test (CVN) Compliance
Our Rajkot metallurgy desk is ready to review your technical drawings, testing protocols, and delivery schedules for custom closed-die forgings strictly up to 50 kg.