1. What is the primary composition and type of Inconel alloys like 600, 601, 738, 713, and 690?
Answer:
All these are nickel-chromium-based alloys with varying compositions for corrosion resistance and high-temperature strength.
| Alloy | Key Features / Composition |
|---|---|
| Inconel 600 | Ni 72%, Cr 14–17%, Fe 6–10%; excellent oxidation and corrosion resistance |
| Inconel 601 | Ni 58%, Cr 21–25%, Fe 12–14%, Al 1%; high-temperature oxidation resistance |
| Inconel 738 | Ni 60–63%, Cr 15–18%, Co 8–10%, Ti 2–3%; precipitation-hardened, high creep strength |
| Inconel 713 | Ni 60–63%, Cr 16–18%, Al/Ti added; cast alloy, high-temperature turbine applications |
| Inconel 690 | Ni 58%, Cr 28–33%, Fe 7–11%; excellent stress-corrosion cracking resistance |
2. What are the typical applications of these Inconel alloys?
Answer:
Inconel 600 & 601: Furnace components, heat exchangers, chemical processing equipment
Inconel 690: Steam generator tubing in nuclear power plants, high-temperature chemical plants
Inconel 738 & 713: Gas turbine blades, aeroengine components, high-temperature castings
All are used where high-temperature corrosion, oxidation, and mechanical strength are required.
3. What temperature ranges can these alloys operate in?
Answer:
Inconel 600: Up to 1,100°F (593°C) continuous
Inconel 601: Up to 2,000°F (1,093°C)
Inconel 690: Up to 1,800°F (982°C)
Inconel 738 & 713: 1,800–2,200°F (982–1,204°C), depending on heat treatment
High-temperature creep and stress-rupture resistance are key features.
4. What mechanical properties can be expected?
Answer:
Inconel 600: Tensile 515 MPa, Yield 205 MPa, Elongation 40%
Inconel 601: Tensile 760 MPa, Yield 310 MPa, Elongation 30%
Inconel 690: Tensile 690–860 MPa, Yield 310–520 MPa
Inconel 738 & 713: High-strength, precipitation-hardened alloys, tensile 1,200–1,400 MPa, excellent creep resistance
5. How resistant are these alloys to corrosion and oxidation?
Answer:
Inconel 600 & 601: Excellent resistance to oxidation and aqueous corrosion
Inconel 690: Exceptional resistance to stress-corrosion cracking in chloride and acidic environments
Inconel 738 & 713: Resistant to high-temperature oxidation and corrosion in turbine and chemical environments
These alloys outperform stainless steels in high-temperature and aggressive chemical environments.
