🧲 Ferrite Testing in NDT: Strengthening Stainless Steel Welds
Ferrite testing, a critical branch of non-destructive testing (NDT), ensures that stainless steel welds and components are structurally sound, corrosion-resistant, and meet strict industry standards.
At Inspection Technic, we specialize in on-site and lab-based ferrite testing using advanced Feritscope (magnetic induction method) for fast and reliable results—without damaging your components.
📘 What is Ferrite Testing?
Ferrite testing measures the ferrite content (δ-ferrite) in austenitic and duplex stainless steels, especially in weld zones.
Why it matters:
Too low ferrite leads to cracking and poor weld stability.
Too high ferrite results in brittleness and loss of corrosion resistance.
So, maintaining the correct ferrite balance is essential to ensure optimal mechanical strength, weld integrity, and corrosion protection—especially in pressure-critical environments.
🔍 Where is Ferrite Testing Used?
Ferrite testing is commonly applied in:
Welded joints of stainless steel piping
Pressure vessels in power plants
Duplex/Super duplex steel pipelines
Petrochemical and refinery equipment
Heat exchangers and boiler components
At Inspection Technic, we work across industries like:
Oil & Gas
Power & Energy
Chemical Plants
Shipbuilding
Pharmaceutical Manufacturing
Fabrication Shops
🛠️ Methods We Use: Magnetic Induction with Feritscope
We use advanced portable Feritscope® instruments that provide:
Quick, accurate on-site ferrite readings
Digital output with automatic average and max values
Calibration with certified reference blocks
Range: 0–100 FN (Ferrite Number)
✅ Benefits of Ferrite Testing
🧪 Assures Weld Quality – Prevents cracking or corrosion
📊 Process Control – Detects dilution during welding
⚙️ Conformance with Codes – Meets ASME, ISO, and EN standards
🔍 Prevents Failure – Early detection of improper heat treatment
💡 No Damage – Entirely non-destructive and repeatable
📏 Ferrite Testing Standards We Follow
ASME Section VIII
AWS A4.2
ISO 8249
EN ISO 17655
🔬 Ferrite Content Requirements (Typical)
| Material Type | Ideal Ferrite Number (FN) |
|---|---|
| Austenitic SS Welds | 3–10 FN |
| Duplex SS Welds | 25–65 FN |
| Super Duplex SS | 30–60 FN |
Note: Exact limits may vary per industry/project specification.
🏆 Why Choose Inspection Technic?
At Inspection Technic, our ferrite testing services are trusted by EPCs, fabricators, and inspection agencies across India.
🔧 Portable On-Site Testing
🎓 Trained & Certified NDT Experts
📍 Pan India Execution Support by NDT Engineering Ltd.
🧾 Traceable Reports with FN Values and Remarks
⚙️ Calibration with Reference Blocks for Accuracy
🚀 Ensure Weld Quality with Expert Ferrite Testing
Ferrite testing is a must-have QA tool in stainless steel welding and duplex steel fabrication. With the help of Inspection Technic, your welds stay strong, safe, and standard-compliant.
📞 Contact Us Today
📍 Website: www.inspectiontechnic.com📲 Execution Support: NDT Engineering Ltd.