Standard Specification of Interganular Corrosion Test
In addition to ASTM A262, several international and national standards are used to evaluate intergranular corrosion (IGC) in stainless steels, often tailored to specific alloy types such as ferritic or duplex steels.
1. International Standards (ISO)
- ISO 3651-1: Specifies the Huey test (boiling nitric acid) for austenitic and ferritic-austenitic (duplex) stainless steels.
- ISO 3651-2: Includes the Monypenny-Strauss test (Method A), a 35% sulfuric acid/copper sulfate test (Method B), and a 40% sulfuric acid/ferric sulfate test (Method C). It is equivalent in principle to ASTM A262 Method E but differs in test duration (typically 20 hours vs. 15 hours).
- ISO 3651-3: A specialized test for low-chromium ferritic stainless steels (under 16% Cr) using a 0.5% sulfuric acid/copper sulfate boiling solution.
- ISO 4212: Specifies a method for oxalic acid etching to screen for IGC in austenitic stainless steels, similar to ASTM A262 Practice A.
2. ASTM Standards
- ASTM G28: Used for nickel-rich and wrought nickel-chromium alloys (e.g., Alloys 625, 825, C-276). It includes Method A (ferric sulfate-sulfuric acid) and Method B (copper-copper sulfate-sulfuric acid).
- ASTM A262 ASTM A262 is an American Society for Testing and Materials standard detailing practices for evaluating the susceptibility of austenitic stainless steel to intergranular corrosion
- ASTM A763: Specifically designed for detecting susceptibility to intergranular attack in ferritic stainless steel.
- ASTM G108: A standard test method for Electrochemical Reactivation (EPR), a non-destructive or quantitative electrochemical technique used to detect sensitization in Type 304 and 304L stainless steels.
- ASTM A923: While primarily for detecting detrimental intermetallic phases (like sigma phase) in duplex stainless steel tubes, it uses similar corrosive media and is often grouped with IGC testing.
3. Regional and National Standards
- GB/T 4334 (China): A comprehensive standard covering methods A through G, closely aligned with both ASTM A262 and ISO 3651 series for austenitic and duplex stainless steels.
- SEP 1877 (Germany): A common European standard for testing nickel-based alloys and stainless steels, often called up in large infrastructure projects.
- IS 10461 (India): Divided into parts for different testing practices to determine IGC susceptibility.
- JIS G0571 – G0580 (Japan): A series of standards covering oxalic acid etching (G0571), ferric sulfate (G0572), nitric acid (G0573), and copper sulfate (G0575) tests.
Metallographic Test – Metallography Testing
Metallographic Test Report
Stress Corrosion Cracking (SCC)
Chloride Stress Corrosion Cracking
Stainless Steel Corrosion
Corrosion of Piping
Corrosion Process
Surface Coatings for Corrosion
Corrosion Resistant Material
Bi- Metallic Corrosion.Galvanic Corrosion
Intergranular Corrosion
Intergranular Corrosion of Stainless Steel Tubes
Corrosion Resistant Stainless Steel Tube
Corrosion Resistance of Stainless Steel Tubes
Seawater Resistance of Stainless Steel Tubes
Corrosion Mechanism in Stainless Steel Tube
ASTM A262 Intergranular Corrosion Test IGC
ASTM E112 Standard Test Methods for Determining Average Grain Size
Methods of minimizing chloride stress corrosion cracking
