Creep, Creep-Rupture & Stress-Rupture Testing Laboratory in India

ASTM E139 | ASTM E292 | ISO 204 | High-Temperature | Long-Duration Testing

Subodh Material Technologists Private Limited (Subodh Labs) provides specialised Creep Testing, Creep-Rupture Testing and Stress-Rupture Testing of metallic materials at elevated temperatures.

Our laboratory has 11 dedicated creep and stress-rupture testing frames, providing the capability to conduct multiple long-duration tests simultaneously for material qualification, research and development, product evaluation and high-temperature engineering applications.

We support testing requirements for Power Generation, Oil & Gas, Nuclear, Aerospace, Defence, Automotive, Heavy Engineering, Pressure Equipment and R&D organisations.

Our creep and stress-rupture testing services are performed according to applicable requirements of international standards such as ASTM E139, ASTM E292 and ISO 204, subject to the material, specimen configuration, test conditions and agreed test programme.

Creep, Creep-Rupture & Stress-Rupture Testing Services

Subodh Labs provides specialised high-temperature testing services including:

• Creep Testing
• Creep-Rupture Testing
• Stress-Rupture Testing
• Stress Rupture Testing
• High-Temperature Creep Testing
• High-Temperature Stress-Rupture Testing
• Long-Duration Creep Testing
• Long-Duration Stress-Rupture Testing
• Constant-Load Creep Testing
• Constant-Stress Testing
• Time-to-Rupture Testing
• Creep Strain Measurement
• Creep Rate Determination
• Rupture Time Determination
• Elongation After Rupture
• Reduction in Area
• Post-Test Specimen Examination
• Creep Curve Evaluation

The appropriate test method is selected based on the material grade, specimen geometry, test temperature, applied stress/load, required duration and applicable standard or customer specification.

ASTM E139 Creep, Creep-Rupture and Stress-Rupture Testing

ASTM E139 is the principal ASTM standard for conducting creep, creep-rupture and stress-rupture tests of metallic materials.

ASTM E139 covers testing used to determine deformation as a function of time during creep testing and the time to rupture under specified tensile loading and temperature conditions.

Subodh Labs provides testing according to applicable requirements of ASTM E139, subject to the agreed test programme and laboratory capability.

ASTM E139 testing may include:

• Creep testing
• Creep-rupture testing
• Stress-rupture testing
• Elevated-temperature testing
• Constant-load testing
• Measurement of creep strain
• Measurement of creep rate
• Determination of time to rupture
• Measurement of elongation
• Measurement of reduction in area
• Post-test examination

Customers requiring ASTM E139 creep testing, ASTM E139 creep-rupture testing or ASTM E139 stress-rupture testing can provide their material specification and test requirements for technical review.

ASTM E139 Stress-Rupture Testing Laboratory

Subodh Labs provides ASTM E139 Stress-Rupture Testing for metallic materials subjected to sustained tensile loading at elevated temperature.

Stress-rupture testing determines the time required for a material specimen to rupture under a specified stress and temperature.

Stress-rupture testing is particularly relevant for materials intended for prolonged service under simultaneous mechanical loading and elevated temperature.

Typical ASTM E139 stress-rupture requirements include:

• Material grade and specification
• Test temperature
• Applied stress or load
• Specimen configuration
• Number of specimens
• Required test duration
• Rupture time
• Elongation after rupture
• Reduction in area
• Post-test examination

Stress-rupture testing can provide valuable information for material comparison, material qualification, alloy development, research and development and high-temperature service evaluation.

What is Stress-Rupture Testing?

Stress-rupture testing is a high-temperature mechanical test used to determine how long a metallic material can withstand a specified tensile stress at a specified elevated temperature before rupture.

Unlike a conventional tensile test, which normally produces failure within a relatively short period, a stress-rupture test may continue for hundreds or thousands of hours, depending on the material, stress and temperature.

The principal result is generally the time to rupture under the specified test conditions.

Additional post-test properties may include:

• Total elongation
• Reduction in area
• Rupture location
• Fracture appearance
• Specimen dimensions
• Test temperature
• Applied stress
• Test duration

Creep Testing

Creep testing evaluates the time-dependent deformation of a metallic material subjected to sustained mechanical loading at elevated temperature.

During a creep test, a specified load or stress is applied to the specimen while the temperature is controlled at the specified test temperature.

The resulting strain is measured as a function of time.

A typical creep curve consists of three stages.

Primary Creep

The creep rate decreases with time during the initial stage of deformation.

Secondary Creep

The material exhibits a relatively stable or minimum creep rate. This region is important for evaluating long-term creep behaviour.

Tertiary Creep

The creep rate increases as the specimen approaches failure and ultimately ruptures.

Creep testing therefore provides information about the time-dependent deformation behaviour of metallic materials at elevated temperatures.

Creep-Rupture Testing

Creep-rupture testing evaluates the time-dependent deformation and eventual rupture of a metallic material under sustained elevated-temperature loading.

Creep-rupture testing can be used to determine:

• Creep strain
• Creep rate
• Time to rupture
• Elongation after rupture
• Reduction in area
• Rupture characteristics

Creep-rupture testing is particularly useful for materials intended for long-term service under elevated temperature and sustained mechanical loading.

Stress-Rupture Testing vs Creep Testing vs Creep-Rupture Testing

Although these terms are closely related, the primary purpose of each test is different.

Creep Testing

Primarily evaluates time-dependent deformation of the material. Typical results include creep strain, creep rate and creep curves.

Creep-Rupture Testing

Evaluates time-dependent deformation and eventual rupture of the specimen under sustained elevated-temperature loading.

Stress-Rupture Testing

Primarily evaluates the time required for rupture under a specified stress and temperature.

The appropriate test should be selected according to the customer's material specification, design requirement and applicable standard.

ASTM E292 Notch Stress-Rupture Testing

Subodh Labs also supports applicable requirements related to ASTM E292 – Time-for-Rupture Notch Tension Tests of Materials.

ASTM E292 is used for determining the time for rupture of notched specimens under specified force and temperature conditions.

Notched stress-rupture testing can be useful when evaluating material behaviour in the presence of a deliberate stress concentration.

ASTM E292 testing may involve:

• Notched tensile specimens
• Controlled elevated temperature
• Constant applied force
• Time-to-rupture measurement
• Post-test dimensional examination
• Rupture evaluation

Customers requiring ASTM E292 notch stress-rupture testing should provide the applicable specimen drawing, material grade, test temperature, applied load/stress and required test duration for technical review.

ISO 204 Creep Testing

ISO 204 – Metallic materials — Uniaxial creep testing in tension provides requirements for determining the creep behaviour of metallic materials under tensile loading at elevated temperature.

Subodh Labs supports applicable ISO 204 creep testing requirements, subject to the agreed test conditions and laboratory capability.

ISO 204 creep testing can be used to evaluate:

• Creep strain
• Creep rate
• Time-dependent deformation
• Material behaviour at specified stress
• Material behaviour at specified temperature
• Long-duration performance

11 Creep and Stress-Rupture Testing Frames

A major capability of Subodh Labs is its dedicated infrastructure for long-duration creep and stress-rupture testing.

Our laboratory has 11 creep and stress-rupture testing frames, allowing multiple test programmes to be conducted simultaneously.

This is particularly useful where a material qualification programme requires testing at different combinations of:

Material + Temperature + Stress + Duration

Multiple testing frames allow different test conditions to be evaluated as part of a larger testing programme.

Our infrastructure supports:

• Multiple simultaneous creep tests
• Stress-rupture tests
• Creep-rupture tests
• Long-duration testing
• Elevated-temperature testing
• Controlled loading
• Temperature monitoring
• Strain measurement
• Test data recording
• Post-test specimen examination

Long-Duration Stress-Rupture Testing

Stress-rupture testing is frequently used for long-duration evaluation of materials intended for elevated-temperature service.

Depending on the customer's requirement, testing may continue for hundreds or thousands of hours.

Long-duration testing can be used to evaluate material performance under sustained:

Temperature + Stress + Time

This type of testing is relevant to high-temperature materials used in power generation, oil & gas, aerospace, defence, nuclear and heavy engineering applications.

The actual test duration depends on the specified material, stress, temperature, acceptance criteria and customer requirement.

Materials for Creep and Stress-Rupture Testing

Subject to applicable test requirements, Subodh Labs can support creep and stress-rupture testing of various metallic materials.

Typical materials include:

• Carbon steels
• Low-alloy steels
• Alloy steels
• Stainless steels
• Cr-Mo steels
• Heat-resistant steels
• High-temperature alloys
• Nickel-based alloys
• Nickel-based superalloys
• Engineering alloys
• Power-generation materials
• Pressure-equipment materials

The test programme should always be established according to the specific material grade and applicable specification.

Applications of Creep and Stress-Rupture Testing

Power Generation

Creep and stress-rupture testing is relevant to materials used in high-temperature power-generation equipment.

Applications may include:

• Boiler tubes
• Superheater tubes
• Reheater tubes
• Headers
• High-temperature piping
• Turbine components
• Pressure-containing components
• High-temperature structural materials

Oil & Gas

Stress-rupture and creep testing can be used for evaluation of materials exposed to prolonged elevated-temperature service.

Applications may include:

• High-temperature piping
• Pressure-containing equipment
• Process equipment
• Refinery equipment
• Petrochemical equipment
• High-temperature alloys

Aerospace and Defence

High-temperature metallic materials and nickel-based superalloys may require long-duration mechanical evaluation.

Applications may include:

• High-temperature alloys
• Nickel-based superalloys
• Heat-resistant materials
• Engine-related materials
• Research and development materials

Nuclear

Creep and stress-rupture testing can form part of material qualification and research programmes involving long-duration elevated-temperature service.

Testing requirements are established according to the applicable material specification and project requirement.

Automotive

High-temperature material evaluation may be relevant to:

• Exhaust components
• Turbocharger materials
• High-temperature engine components
• Heat-resistant alloys
• Automotive R&D

Heavy Engineering

Applications may include:

• Pressure vessels
• Heat exchangers
• Boilers
• High-temperature piping
• Industrial furnace components
• High-temperature structural components
• Engineering alloys

Typical Creep and Stress-Rupture Test Requirements

The following information is normally required before starting a test programme:

• Material grade
• Material specification
• Heat number, where applicable
• Heat-treatment condition
• Test standard
• Test type
• Test temperature
• Applied stress
• Applied load, where applicable
• Specimen dimensions
• Specimen configuration
• Number of specimens
• Required test duration
• Acceptance criteria, where applicable
• Customer/project specification

For ASTM E139 Stress-Rupture Testing, providing the required stress and temperature is particularly important for establishing the test programme.

What Information Is Required for a Stress-Rupture Test?

To enable our technical team to review and quote the requirement efficiently, customers should provide:

1. Material grade

2. Material specification

3. Heat-treatment condition

4. Test standard

5. Test temperature

6. Applied stress or load

7. Required test duration

8. Specimen dimensions

9. Specimen drawing, if available

10. Number of specimens

11. Acceptance criteria

12. Customer/project specification

For technical enquiries, our team can review the requirement and confirm the appropriate test configuration.

High-Temperature Mechanical Testing at Subodh Labs

Creep and stress-rupture testing is supported by our broader material testing capabilities.

High-Temperature Tensile Testing

High-temperature tensile testing for evaluation of tensile properties at specified elevated temperatures.

Tensile Testing

Mechanical testing of metallic materials at ambient and specified temperatures.

Hardness Testing

Rockwell, Brinell and Vickers hardness testing according to applicable requirements.

Metallography

Microstructural examination and metallographic evaluation of metallic materials.

Chemical Analysis

Chemical composition and elemental analysis of metals and alloys.

Fatigue Testing

High-cycle and low-cycle fatigue testing of metallic materials.

Fracture Mechanics Testing

Fracture toughness, CTOD, K1C, J1C and fatigue crack growth testing, subject to applicable requirements.

Corrosion Testing

Laboratory corrosion testing according to applicable ASTM, ISO and NACE standards.

Integrated Material Testing Laboratory

One advantage of conducting creep and stress-rupture testing at a comprehensive materials laboratory is the ability to combine different material evaluation techniques.

A material qualification programme may require:

Chemical Analysis → Mechanical Testing → Creep Testing → Stress-Rupture Testing → Metallography → Hardness Testing

Subodh Labs provides a range of these material testing and characterisation services under one laboratory infrastructure, subject to applicable scope and test requirements.

Creep & Stress-Rupture Testing Laboratory in Navi Mumbai

Subodh Material Technologists Private Limited is located in Navi Mumbai, Maharashtra, India.

We provide material testing services to customers across India and support industrial, engineering, manufacturing and research organisations.

Customers outside Mumbai can coordinate sample submission with our laboratory after technical review of the test requirement.

Why Choose Subodh Labs for Creep and Stress-Rupture Testing?

11 Dedicated Testing Frames

Our 11 creep and stress-rupture testing frames provide capacity for conducting multiple long-duration tests.

Long-Duration Testing Capability

Testing can be undertaken for extended periods depending on the specified material, temperature, stress and test duration.

High-Temperature Testing Infrastructure

Dedicated infrastructure for elevated-temperature mechanical testing.

Integrated Material Testing Facility

Creep and stress-rupture testing can be supported by metallography, chemical analysis, hardness, tensile, fatigue and fracture mechanics testing.

Specimen Preparation

Specimen preparation and machining can be coordinated according to applicable testing requirements.

Technical Review

Our technical team reviews the material, standard, specimen configuration and test parameters before finalising the test programme.

Creep Testing Laboratory in India

Customers searching for a creep testing laboratory in India, creep testing lab in Mumbai, creep rupture testing laboratory, stress rupture testing laboratory, ASTM E139 testing laboratory or high-temperature stress-rupture testing laboratory can contact Subodh Labs with their technical requirement.

Our testing team can review the requirement and advise on:

• Applicable test standard
• Specimen requirements
• Test temperature
• Applied stress/load
• Test duration
• Number of specimens
• Reporting requirements
• Estimated testing schedule

Stress-Rupture Testing Enquiry

For a quotation, please provide:

Material:
Material Grade:
Material Specification:
Test Standard:
Test Type: Creep / Creep-Rupture / Stress-Rupture
Test Temperature:
Applied Stress/Load:
Test Duration:
Specimen Dimensions:
Number of Specimens:
Customer Specification:

Our technical team will review the requirement and provide the appropriate testing proposal.

Frequently Asked Questions

What is stress-rupture testing?

Stress-rupture testing determines the time required for a metallic material to rupture under a specified stress and elevated temperature.

What is stress rupture testing?

Stress rupture testing is another commonly used form of the term stress-rupture testing. It refers to testing the time-to-failure of a material under specified stress and temperature conditions.

What is ASTM E139?

ASTM E139 covers methods for conducting creep, creep-rupture and stress-rupture tests of metallic materials.

Does Subodh Labs provide ASTM E139 stress-rupture testing?

Yes. Subodh Labs provides applicable ASTM E139 stress-rupture testing subject to the material, specimen configuration, test conditions and agreed test programme.

What is the difference between creep and stress rupture?

Creep testing primarily evaluates time-dependent deformation, whereas stress-rupture testing primarily evaluates the time required for rupture under specified stress and temperature.

What is creep-rupture testing?

Creep-rupture testing evaluates the deformation behaviour of a material under sustained elevated-temperature loading and its eventual rupture.

What is ASTM E292?

ASTM E292 covers time-for-rupture notch tension testing of materials and is relevant to notched stress-rupture testing.

Does Subodh Labs provide ASTM E292 testing?

Applicable ASTM E292 notch stress-rupture testing requirements can be reviewed based on the customer's material, specimen and test conditions.

Does Subodh Labs provide ISO 204 creep testing?

Subodh Labs supports applicable ISO 204 creep testing requirements subject to the agreed test conditions and laboratory capability.

How long does a stress-rupture test take?

The duration depends on the material, temperature, applied stress and customer requirement. Long-duration tests may continue for hundreds or thousands of hours.

Which materials can be tested?

Various metallic materials can be evaluated, including steels, stainless steels, alloy steels, high-temperature alloys and nickel-based alloys, subject to the applicable test requirements.

Can multiple creep and stress-rupture tests be conducted simultaneously?

Yes. Subodh Labs has 11 creep and stress-rupture testing frames, allowing multiple tests to be conducted simultaneously.

Where is Subodh Labs located?

Subodh Material Technologists is located in Navi Mumbai, Maharashtra, India.

Can samples be sent from outside Mumbai?

Yes. Customers can coordinate sample submission with the laboratory after technical review of the testing requirement.

Related Testing Services

Explore our other material testing capabilities:

High-Temperature Tensile Testing

Creep Testing

Stress-Rupture Testing

Creep-Rupture Testing

Fatigue Testing

Fracture Mechanics Testing

Metallography

Chemical Analysis

Hardness Testing

Corrosion Testing

NABL Accreditation

Subodh Material Technologists Private Limited operates a laboratory accredited by NABL to ISO/IEC 17025:2017 under accreditation number TC-8225.

NABL accreditation applies only to the tests, standards and parameters included within the laboratory's current accredited scope.

Customers should refer to the current NABL scope or contact Subodh Labs to confirm whether a particular test, material, standard and parameter is included within the accredited scope.

Testing services outside the accredited scope, where offered, are identified accordingly.

Contact Subodh Labs

Subodh Material Technologists Private Limited

Creep Testing | Creep-Rupture Testing | Stress-Rupture Testing | High-Temperature Mechanical Testing

Navi Mumbai, Maharashtra, India

For enquiries related to ASTM E139, ASTM E292, ISO 204, creep testing, creep-rupture testing, stress-rupture testing or long-duration high-temperature testing, contact our technical team with your material specification and test requirements.