1. What is the chemical composition of Inconel 625 (N06625) pipes?
Answer:
Inconel 625 is a nickel-based alloy with excellent corrosion resistance. Its typical composition is:
Nickel (Ni): 58% min
Chromium (Cr): 20–23%
Molybdenum (Mo): 8–10%
Niobium + Tantalum (Nb+Ta): 3.15–4.15%
Iron (Fe): balance (~5%)
Small amounts of cobalt, titanium, aluminum, and manganese
This composition ensures resistance to pitting, crevice corrosion, and high-temperature oxidation, making it suitable for municipal water, sewage, and industrial applications.
2. What are the mechanical properties of Inconel 625 pipes?
Answer:
Tensile Strength: ~827–965 MPa
Yield Strength: ~414–552 MPa
Elongation: ≥30%
Hardness: ~180–240 HB
Excellent creep and fatigue resistance at elevated temperatures (up to 980°C)
These properties ensure the pipe can withstand high pressure, thermal cycling, and mechanical stress in municipal systems.
3. What are the key applications of Inconel 625 pipes in municipal engineering?
Answer:
High-pressure water distribution systems
Sewage treatment plants, including chemical-exposed pipelines
Industrial wastewater and drainage systems
Firefighting water networks
Pipelines exposed to chlorides or corrosive chemicals
Its corrosion and heat resistance make it highly durable in municipal environments with harsh conditions.
4. Are Inconel 625 pipes seamless or welded, and what sizes are available?
Answer:
Seamless pipes are most common for municipal engineering because they offer higher pressure resistance, durability, and leak prevention.
Welded pipes are available for larger diameters but are less common in high-pressure municipal applications.
Standard sizes: Outer diameter from 6 mm to 508 mm (custom sizes available) and wall thickness from 1 mm to 50 mm.
Lengths: Standard 6 m or cut-to-size as per project requirements.
5. How should Inconel 625 pipes be installed and maintained in municipal projects?
Answer:
Pipes should be handled carefully to avoid scratches and dents, which can initiate corrosion.
Flanges, joints, and fittings must match N06625 specifications to maintain system integrity.
Periodic inspections should check for corrosion, mechanical damage, or leaks.
In chemically aggressive water systems, passivation or protective coatings may extend pipe life.
Proper thermal expansion allowances must be included in long pipelines to avoid stress buildup.
