DIN 2.4642 Alloy Seamless Tube Inconel 690™ ASME SB163 / SB167 / SB829
Super alloys have good creep and oxidation resistance. They are also known as high performance alloys, and can be formed in different shapes. Work hardening, precipitation hardening, and solid-solution hardening are performed for strengthening the super alloys. These alloys have the capcity to function at very high temperatures and severe mechanical stress, and also where high surface stability is required.
Inconel 690™ is a nickel-chromium alloy. It has high resistance to hot gases or oxidizing chemicals due to the presence of high chromium content. The following datasheet gives an overview of Inconel 690™.
Chemical Composition
The chemical composition of Inconel 690™ is outlined in the following table.
| Element |
Content (%) |
| Chromium, Cr |
27-31 |
| Iron, Fe |
7-11 |
| Silicon, Si |
0.5 max |
| Manganese, Mn |
0.5 max |
| Copper, Cu |
0.5 max |
| Silicon, Si |
0.5 max |
| Carbon, C |
0.05 max |
| Sulfur, S |
0.015 max |
| Nickel, Ni |
Remainder |
Physical Properties
The physical properties of Inconel 690 ™ are given in the following table.
| Properties |
Metric |
Imperial |
| Density |
8.19 g/cm³ |
0.296 lb/in³ |
| Melting point |
1343-1377°C |
2450-2510°F |
Mechanical Properties
The mechanical properties of Inconel 690™ are displayed in the following table.
| Properties |
Metric |
Imperial |
| Poisson's ratio |
0.29 |
0.29 |
| Hardness |
85 |
85 |
Thermal Properties
The following table shows the thermal properties of Inconel 690™.
| Properties |
Metric |
Imperial |
| Thermal conductivity |
12.1 W/mK |
84 BTU in/hr.ft².°F |
Other Designations
Other designations that are equivalent to Inconel 690™ include:
- ASTM B167 / SB163 / SB829
- DIN 2.4642
Fabrication and Heat Treatment
Machinability
Inconel 690™ can be machined using conventional machining methods which are used for iron-based alloys. Machining operations are performed using commercial coolants. High-speed operations such as grinding, milling or turning, are performed using water-base coolants.
Forming
Inconel 690™ can be formed using all conventional techniques.
Welding
Inconel 690™ is welded using gas-tungsten arc welding, shielded metal-arc welding, gas metal-arc welding, and submerged-arc welding methods.
Heat Treatment
Inconel 690™ does not react to heat treatment.
Forging
Inconel 690™ is forged at 1038 to 1233°C (1900 to 2250°F).
Hot Working
Inconel 690™ is hot worked at 872 to 1205°C (1600 to 2200°F).
Cold Working
Inconel 690™ is cold worked using standard tooling.
Annealing
Inconel 690™ is annealed at 1038°C (1900°F) followed by cooling.
Aging
Inconel 690™ does not react to aging thermal treatment.
Hardening
Inconel 690™ is hardened by cold working.
Applications
Inconel 690™ is used in the following applications:
- Duct work
- High temperature burners
- Furnaces
- Petrochemical heaters
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