Impact Testing Laboratory in India

Charpy Impact Testing of Metals, Steel, Alloys and Engineering Materials

Subodh Material Technologists provides Charpy impact testing and Charpy V-Notch (CVN) impact testing for metallic materials, steels, alloys, welded materials and engineering applications.

Impact testing evaluates the behaviour of a material when subjected to a rapidly applied load and determines the energy absorbed by a notched specimen during fracture.

Our laboratory provides applicable Charpy impact testing as per ASTM E23 and ISO 148, including testing at ambient and applicable low temperatures.

Subodh Material Technologists has 300 J and 400 J impact testing machines for applicable metallic material impact-testing requirements.

Key Testing Capabilities

• Charpy Impact Testing

• Charpy V-Notch (CVN) Testing

• ASTM E23 Impact Testing

• ISO 148 Impact Testing

• Applicable Low-Temperature Impact Testing

• Sub-Zero Impact Testing

• Testing of Steel, Alloys and Other Metallic Materials

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ASTM E23 Charpy Impact Testing

ASTM E23 is a widely used standard for notched-bar impact testing of metallic materials. Charpy testing according to ASTM E23 is commonly specified for steels and other engineering materials where resistance to impact loading is an important consideration.

The applicable specimen dimensions, notch configuration, test temperature and reporting requirements should be established from the relevant material specification, product standard or project requirement.

ISO 148 Charpy Impact Testing

ISO 148 is an international standard associated with Charpy pendulum impact testing of metallic materials.

Subodh Material Technologists provides applicable Charpy impact testing according to the relevant testing requirements and customer specification.

Commonly Requested Impact Testing Requirements

• ASTM E23 Charpy impact testing

• ISO 148 Charpy impact testing

• Charpy V-Notch (CVN) testing

• Ambient-temperature impact testing

• Low-temperature impact testing

• Sub-zero Charpy impact testing

• Testing of steel and metallic materials

Charpy V-Notch (CVN) Testing of Metallic Materials

Charpy V-Notch testing is a widely used method for evaluating the impact behaviour of metallic materials. The test uses a notched specimen that is fractured by a pendulum impact, with the energy absorbed during fracture being determined.

At Subodh Material Technologists, applicable Charpy V-Notch impact testing can be performed according to the relevant testing standard, material specification and customer requirement.

What Can Be Evaluated?

Depending on the applicable specification, Charpy impact testing may include:

• Impact energy absorbed during fracture

• Test temperature

• Specimen orientation

• Specimen dimensions

• Notch configuration

• Individual impact values

• Average impact value, where applicable

• Fracture appearance, where specified

• Shear fracture information, where specified

Charpy V-Notch Testing Applications

CVN testing is commonly specified for materials used in applications where resistance to impact loading and low-temperature fracture behaviour are important considerations.

Typical applications include:

• Pressure vessels

• Pipelines and piping components

• Oil & Gas equipment

• Petrochemical equipment

• Power generation equipment

• Structural steels

• Heavy engineering components

• Welded components

• Low-temperature service materials

Sub-Zero Charpy Impact Testing

The impact behaviour of metallic materials can change significantly as temperature decreases. For materials intended for low-temperature service, Charpy impact testing at the specified temperature can therefore be an important part of material qualification and quality evaluation.

Subodh Material Technologists provides applicable low-temperature and sub-zero Charpy impact testing, with testing capability extending to approximately −196°C, subject to the applicable test method, specimen requirements and laboratory capability.

Typical Applications

Low-temperature Charpy impact testing may be relevant to:

• LNG and cryogenic applications

• Oil & Gas equipment

• Petrochemical facilities

• Pressure vessels

• Pipelines and piping systems

• Power generation

• Heavy engineering

• Low-temperature structural applications

The required impact test temperature should always be established from the applicable material specification, product standard, project specification or customer requirement.

Charpy Impact Testing of Steel and Metallic Materials

Subodh Material Technologists provides applicable Charpy impact testing for a range of metallic materials where impact properties are specified by the relevant material or product standard.

Typical Materials

Impact testing may be applicable to:

• Carbon steel

• Structural steel

• Alloy steel

• Low-alloy steel

• Stainless steel

• Duplex and super-duplex stainless steel

• Welded materials

• Plates

• Pipes and tubes

• Forgings

• Other metallic materials subject to the applicable testing requirements

The suitability of a particular specimen for testing depends on the material specification, specimen dimensions, notch configuration, orientation, test temperature and applicable test standard.

Customers are encouraged to provide the material specification and testing requirement so that the laboratory can review the requirement before testing.

Charpy Impact Test Results and Test Reports

A Charpy impact test report typically records the relevant specimen, material, testing conditions and measured impact results according to the applicable test method and specification.

Depending on the applicable requirement, the report may include:

• Material identification

• Specimen identification

• Specimen orientation

• Notch configuration

• Test temperature

• Individual impact energy values

• Average impact energy, where applicable

• Fracture-related observations, where specified

• Applicable testing standard

• Relevant acceptance criteria, where provided by the customer or specification

Impact Energy

The principal measured result in a Charpy impact test is the energy absorbed by the specimen during fracture, generally expressed in Joules (J).

The interpretation of whether a result satisfies a particular acceptance requirement should be made against the applicable material specification, product standard, purchase specification or project requirement.

Customer Requirements

Customers can provide the applicable material specification, drawing, purchase specification or project requirement along with the specimens so that the testing requirements can be reviewed before testing.

Charpy Impact Testing for Engineering Applications

Charpy impact testing is used across industries where the impact behaviour and fracture resistance of metallic materials are important considerations.

Subodh Material Technologists supports applicable impact-testing requirements for materials used in:

• Oil & Gas and pipeline applications

• Petrochemical and process industries

• Pressure vessels and pressure equipment

• Power generation

• Heavy engineering

• Automotive applications

• Structural engineering

• Research and development

• Material qualification and quality control

Impact Testing for Oil & Gas and Energy Applications

Impact testing is frequently specified for materials used in demanding energy-sector applications, particularly where materials may experience low temperatures or sudden loading conditions.

For project-specific requirements, customers can provide the applicable project specification, material standard, purchase specification or inspection requirement for technical review before testing.

Frequently Asked Questions About Charpy Impact Testing

What is the difference between Charpy impact testing and Charpy V-Notch testing?

Charpy impact testing is the broader test category. Charpy V-Notch (CVN) refers to the specified specimen configuration with a V-shaped notch used for the applicable test.

What standard is used for Charpy impact testing?

Common standards include ASTM E23 and ISO 148. The applicable standard should be selected according to the material specification, product standard or project requirement.

What is impact energy?

Impact energy is the energy absorbed by the specimen during the impact fracture. It is generally reported in Joules (J).

Can Charpy impact testing be performed at low temperatures?

Yes, where the required low-temperature capability, specimen configuration and applicable test requirements are available. The required test temperature should be specified by the relevant material or project requirement.

Can Subodh Material Technologists test welded specimens?

Applicable impact testing of welded materials can be considered where the required specimen geometry, orientation and testing requirements are suitable. Customers should provide the applicable welding or material specification for review.

What information should I provide when requesting a Charpy test?

Ideally provide the material grade, material specification, specimen dimensions, test standard, test temperature, specimen orientation and any project or acceptance requirement.

Where is Subodh Material Technologists located?

Subodh Material Technologists is a materials and metallurgical testing laboratory based in Navi Mumbai, Maharashtra, India.