ASTM A268 Specification for Seamless and Welded Ferritic and Martensitic Stainless-Steel Tubing for General Service
ASTM A268 is a standard specification for manufacturing, chemical composition, mechanical properties, dimensional, and inspection requirements of ferritic and martensitic stainless-steel tubing. Compliance with ASTM A268 is verified through chemical analysis, mechanical testing, dimensional inspection, hydrostatic or nondestructive electric testing, and visual inspection as specified by the standard. ASTM A268 is widely used in power generation, chemical processing, oil and gas, food processing, heat exchangers, boilers, and industrial equipment manufacturing where durable, corrosion-resistant stainless-steel tubing is required for long-term service.
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What is ASTM A268?
ASTM A268 is a standard specification for manufacturing and quality requirements for seamless and welded ferritic and martensitic stainless-steel tubing for general service in industrial applications. ASTM A268 (Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless-Steel Tubing for General Service) includes specifications for material grades, chemical composition limits, mechanical property requirements, manufacturing methods, heat treatment conditions, dimensional tolerances, workmanship, and inspection procedures to assure material uniformity and consistent product quality. Manufacturers routinely inspect and test the tubing to verify compliance with the specified mechanical properties, dimensional tolerances, and inspection requirements before product acceptance.
Get Certified ASTM A268 Testing for Uncompromising Quality and Project Success
Stainless steel tubing is widely used in industrial systems that require corrosion resistance, mechanical strength, and reliable performance at elevated temperatures. ASTM A268 establishes standardized manufacturing, testing, and inspection requirements for seamless and welded ferritic and martensitic stainless steel tubing. Professional laboratory testing confirms compliance with chemical composition, mechanical properties, dimensional tolerances, and inspection requirements, thereby reducing the risk of material failure during service.
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ASTM A268 Equipment and Sample Preparation Guide
Sample and specimen details
Representative seamless or welded ferritic and martensitic stainless steel tubing is selected from the production lot for testing.
Specimen dimensions and Preparation
Specimen size is dependent on the size of tubing, wall thickness, and testing requirements.The analyst prepares test specimens from finished tubing per the applicable ASTM mechanical test methods while avoiding damage that could affect the test results.
Universal Testing Machine (UTM)
This apparatus clamps a machined specimen from the tubing and applies a tensile load to determine tensile strength, yield strength, and elongation.
Inspection Equipment
Inspection equipment includes hydrostatic testing machines, eddy current testing equipment, dimensional measuring instruments, and visual inspection tools.
Testing Procedures and Requirements
The ASTM A268 specification includes standardized mechanical testing and inspection criteria that manufacturers use to validate the quality of tubing. Representative tubing samples are selected after manufacturing and heat treatment to verify compliance with the specified material, mechanical property, and dimensional tolerance requirements before final acceptance.
Other ASTM standards mentioned in this specification include ASTM A480/A480M, A763, A1016/A1016M, E213, A763, A789, A790, A941, and E273.
Chemical Composition
Verifies the chemical composition of stainless steel tubing to the requirements of the appropriate grade.
Mechanical Property Testing
Carries out tensile testing, hardness testing, flaring/flange testing, reverse flattening, and intergranular corrosion testing (as applicable).
Hydrostatic and Nondestructive Examination
Performs hydrostatic pressure tests or nondestructive electric tests together with dimensional and visual inspections to verify compliance with the specification.
ASTM A268 Seamless and Welded Ferritic Stainless-Steel Tubing
What is the Scope of ASTM A268 Test Standard?
ASTM A268 covers seamless and welded ferritic and martensitic stainless steel tubing intended for general service and elevated temperature applications. The specification establishes uniform requirements for manufacturing, material properties, dimensions, heat treatment, and inspection to verify compliance with ASTM A268.
Applies to seamless and welded ferritic and martensitic general service stainless steel tubing.
Defines specifications for the chemical composition of specific grades of stainless steel.
Sets mechanical property specifications, such as tensile strength and elongation.
Specifies manufacturing processes, heat treatment, dimensional tolerances, and workmanship.
Establishes manufacturing testing, inspection, and acceptance requirements for ferritic and martensitic stainless steel tubing.
What are the Uses of ASTM A268?
ASTM A268 tubing is widely used in industries requiring corrosion-resistant stainless steel tubing with reliable mechanical performance. The specification covers multiple ferritic and martensitic stainless steel grades with properties that vary depending on the specific grade and intended service conditions.
Produce stainless steel tubes that are resistant to corrosion for industrial use.
Manufacture tubing for heat exchangers, condensers, and boiler systems.
Provide stainless steel tubes to chemical processing plants.
Install piping systems in power generation plants.
Produce tubes for food and beverage processing machines.
Support oil and gas processing applications.
Conduct quality control in the process of stainless-steel tube production.
Check compliance prior to installation in industrial piping systems.
Which materials are used for the ASTM A268 test?
ASTM A268 specifies seamless and welded ferritic and martensitic stainless steel tubing for general corrosion-resistant and high-temperature applications. The standard covers several grades of ferritic and martensitic stainless steel tubing used in heat exchangers, boilers, condensers, power generation equipment, petrochemical plants, and industrial process systems.
Why is ASTM A268 Important for High-Temperature Service?
ASTM A268 is significant because it provides specification requirements for the manufacturing, mechanical properties, corrosion resistance, and inspection of ferritic and martensitic stainless steel tubing. ASTM A268 specifies manufacturing material testing and inspection requirements that help verify compliance with the specification for ferritic and martensitic stainless steel tubing.
Common Challenges and Troubleshooting
Some common challenges include maintaining a consistent chemical composition, achieving proper heat treatment, controlling dimensional tolerances, preventing weld imperfections, and ensuring compliance with mechanical property requirements. Technicians should regularly calibrate testing equipment, properly prepare representative specimens, complete all required dimensional inspections, and perform all evaluations in accordance with the referenced ASTM test methods.
ASTM A268 Testing Process and Data Collection
Representative tubing samples are selected from the production lot for inspection and testing. Dimensional measurements are typically performed before tensile hardness, flaring flange reverse flattening, hydrostatic or nondestructive electrical testing, and visual examination as applicable. Heat treatment records are also checked as required. Chemical composition, tensile strength, yield strength, elongation, hardness values, dimensions, hydrostatic or nondestructive examination results, visual inspection results, and final acceptance are typical data collected.
ASTM A268 Analysis Results and Interpretation
Results are commonly reported in MPa or psi for tensile and yield strength, % for elongation, HBW or HRC for hardness (where applicable), and mm or inches for dimensional measurements.
Most results from hydrostatic or nondestructive electrical examinations are reported according to the specification’s acceptance criteria. If all specified acceptance criteria are met, the material is considered to comply with ASTM A268 and may be accepted in accordance with the specification.
What are the Factors to Consider for ASTM A268 Testing?
The following can be considered while choosing a lab for this testing.
Speed: The efficient inspection and testing procedures allow manufacturers to ensure tubing quality without delaying deliveries and production schedules.
Expertise: The use of experienced metallurgical professionals will ensure that accurate specimens are prepared, mechanical testing is carried out with great care and reliability, and the results of inspection are interpreted.
Cost: Early quality verification reduces material failures, lowers maintenance costs, and improves the long-term reliability of stainless-steel tubing operating in demanding industrial environments.
Malhar Khole is a Material Testing Associate at MaTestLab Inc. and holds a postgraduate degree in Material Science and Technology from IIT...
FAQ's
Where can I get the astm a268 tested?
You can share your astm a268 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm a268 test to various testing techniques.
How much do I need to pay for the astm a268 test?
Please contact us for a detailed quote for your astm a268 testing needs. Cost incurred to carry out different astm a268 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.
How many samples are required for astm a268?
The required number of samples or specimens should comply with the procedure given in the astm a268 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
How much discount can I get on the astm a268 test?
MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.
How many days will it take to complete the astm a268 test?
The turnaround time for astm a268 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.
Where can I get the astm a268 tested?
You can share your astm a268 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm a268 test to various testing techniques.
MaTestLab Inc. offers accessible, quick, and affordable material testing, product testing, and failure analysis services. We support your on-demand testing and expert consultation needs with the help of our extensive network of material testing laboratories situated in the US and other parts of the world.
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