MaTestLab > Test Standards > ASTM G48 Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels
Last updated 25th February 2025
ASTM G48 Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels
ASTM G48 test methods determine the resistance of stainless steels and similar alloys to pitting and crevice corrosion. The pitting and crevice corrosion test is done by exposing samples to oxidizing chloride conditions. This test helps determine whether a material is suitable for a particular application, considering localized corrosion is risky. It does this by measuring the material's susceptibility to corrosion. The test outcomes can be utilized to rank alloys according to their increasing resistance to pitting and crevice corrosion and other corrosion characteristics like depth, extent, and morphology. Sometimes corrosion rates are reported in mm/year or equivalent units for accuracy and consistency.
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ASTM G48 Introduction
The ASTM G48 test methods are specifically designed for laboratory testing to compare the resistance of stainless steels and similar alloys against pitting and crevice corrosion. The results of these tests are helpful in evaluating alloys in increasing order based on their resistance to pitting and crevice corrosion. This ranking enables a comparative comparison of various alloys’ performance in certain situations. This test method is extensively used in the metal industry to assess the corrosion resistance of raw materials and finished products. MaTestLab is a leading material testing service in the United States, with an extensive network of testing laboratories.
ASTM G48 Test Procedure
Specimen Selection
Specimens are chosen carefully to accurately represent the intended stainless steels or alloys for testing, ensuring consistency and accuracy. They are thoroughly cleaned, polished, and decontaminated to establish standardized testing conditions before testing.
Test Setup and Execution
Following the test parameters, the specimens are submerged in a ferric chloride solution at elevated temperatures. Continuous observation is conducted to detect pitting or crevice corrosion, which is usually identified visually or through measurement techniques. The alloy’s resistance to these localized corrosion forms is assessed through vigilant recording throughout the test duration.
G48 Equipment and Sample Preparation
Specimen Details
G48 can accommodate different specimen shapes. Maintaining uniform dimensions is crucial, and end-grain surface proportions should be minimized due to corrosion susceptibility. Deformed specimens should be removed before testing.
Specimen Dimensions
ASTM G48 testing recommends a standard size of 25 by 50 mm (1 by 2 in.). Consistency in dimensions is crucial for comparative evaluations. Minimizing end-grain surface proportion is advised, except for pitting. Sheared specimens should be removed from deformed material before testing, unless corrosion resistance is a focus.
G48 Test Results and Interpretation
ASTM G48 testing involves observing pitting and crevice corrosion on stainless steels and alloys and assessing corrosion characteristics like depth, extent, and morphology. Results may include measurements of corrosion rates over specified timeframes. Measurements are conducted in millimeters, degrees Celsius, hours, and micrometers, with corrosion rates often reported in mm/year or equivalent units for accuracy and consistency.
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Tests Related to ASTM G48
ASTM G48-related tests include ASTM A262 for detecting susceptibility to intergranular attack in austenitic stainless steels, the ASTM D1193 specification for reagent water, and the ASTM G46 guide for examining and evaluating pitting corrosion.
Use of ASTM G48 in Various Industries
The test is significant in applications such as oil and gas, chemical processing, and marine for assessing the resistance of materials in some extreme environments, like downhole tubing and pipelines, and selecting resistant materials when exposed to reactors and storage tanks.
Materials Commonly Tested with ASTM G48
In the case of high-performance alloys such as duplex, super duplex, and austenitic stainless steels, this standard is adopted to measure corrosion resistance properties in chloride-rich environments, which are critical applications in seawater or industrial chemicals.
Common Challenges and Troubleshooting in ASTM G48 Testing
This test requires consistent temperature and solution concentration for the precise results. Sample preparation that is inconsistent or where the temperature does not meet the required criteria produces erratic data. Laboratories only have the best equipment with procedure controls in place to ensure test reliability.
Safety and Best Practices in ASTM G48 Testing
Safety must be maintained during testing due to strong corrosive solutions being utilised, such as ferric chloride. Best practices include the use of PPE, such as gloves, goggles, and lab coats, with well-ventilated areas designed for testing and kept open during the process. Emergency spill kits need to be on hand at all times.
Importance of ASTM G48
This standard is an invaluable method that calculates the anticorrosive resistance of stainless steels in corrosive applications. It allows industries to determine whether materials are suitable, thus preventing costly failures and ensuring that critical infrastructures are safe and durable because they can withstand operational stresses in their intended environments.
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FAQ's
Where can I get the astm g48 tested?
You can share your astm g48 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 g48 test to various testing techniques.
How much do I need to pay for the astm g48 test?
Please contact us for a detailed quote for your astm g48 testing needs. Cost incurred to carry out different astm g48 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 g48?
The required number of samples or specimens should comply with the procedure given in the astm g48 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 g48 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 g48 test?
The turnaround time for astm g48 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 g48 tested?
You can share your astm g48 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 g48 test to various testing techniques.
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