1. Introduce
– Alloy developed to provide optimum high temperature oxidation resistance for wrought austenitic materials while still allowing for conventional forming and joining
– Primarily designed for use at temperatures above 955°C
– Oxidation resistance exceeds traditional heat-resistant forging alloys
→ Forms oxide scale, a mixture of Cr and Al oxides, at temperatures below 955°C
→ Excellent oxidation resistance due to the formation of a protective oxide scale of the Al₂O₃ type
– UNS N07214
* Al₂O₃ scale
- Provides oxidation resistance
- Provides good resistance to carbonization, nitriding and corrosion in chlorine-containing oxidizing environments
* UNS
- Abbreviation for Unified Numbering Systems for Metals and Alloys
- Unified unique numbering system for metals and alloys
- A representative number that is compatible with metals and alloys defined in many material-related codes such as ASTM, AISI, ASME, AWS, etc.
* N : Nickel and nickel alloys
* UNS N07214 : 07XXX : Chromium (Precipitation-hardenable alloy)
* Haynes
– Alloys designed for high temperature strength, thermal fatigue resistance, oxidation resistance, and corrosion resistance
– Alloys composed primarily of Ni, Cr, Co, with elements such as W, Mo, Fe, etc.
2. Property
– Suitable for use in relatively low stress, high temperature oxidizing environments
– Corrosion resistance, high temperature strength, thermal fatigue resistance
| Element | Impact |
|---|---|
| Ni | Provides corrosion resistance |
| Cr | Provides corrosion resistance, oxidation resistance |
| Al | Provides high temperature creep properties |
| Ti | Provides high temperature strength |
| Si | Provides localized corrosion resistance |
| Mn | Provides machinability, weldability → Prevents the formation of grain boundary deposits in the weld heat zone → Can be used in the as-welded condition for chemical process applications |
| Co | Provides strength, creep properties |
| Zr | Provide grain boundary strength |
[Haynes 214 Chemical Composition (%)]
| Ni | Cr | Fe | C | Al |
|---|---|---|---|---|
| 69.49~78.90 | 15.00 ~ 17.00 | 2.00 ~ 4.00 | Max. 0.05 | 4.10 ~ 5.00 |
| Ti | Si | Mn | Mo | S |
|---|---|---|---|---|
| Max. 0.50 | Max. 0.20 | Max. 0.50 | Max. 0.50 | Max. 0.02 |
| Co | Nb | W | Zr | P |
|---|---|---|---|---|
| Max. 2.00 | Max. 0.15 | Max. 0.50 | Max. 0.02 | Max. 0.02 |
| Y | Mg | |||
|---|---|---|---|---|
| Max. 0.04 | Max. 0.01 |
[Haynes 214 Mechanical Properties]
| Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation (%) |
|---|---|---|
| Min. 758 | Min. 438 | Min. 25 |
[Haynes 214 Physical Properties]
| Density (g/cm³) | Melting Range (℃) | Specific Heat (0-100℃), J/kg*℃ |
|---|---|---|
| 8.05 | 1355 ~ 1400 | 452 |
3. Standard & Specification
– Specification : UNS N07214
| Product Form | AMS | ASTM |
|---|---|---|
| Sheet, Strip, Plate | 5861 | – |
| Bar, Wire | 5732 | – |
| Wire, Coil | – | 582, B581 |
4. Available Form
– Rod, Bar : Round, Square, Rounds, Forged, Cold Drawn, Hot Rolled, Square, Hex, Flat
– Plate, Sheet
– Pipe
– Wire, Coil : round, flat, seam, roll
5. Application & Product
– Aerospace, Chemical, Power Generation
| Application | Product |
|---|---|
| Aerospace | Exhaust systems, Afterburners, Rocket motor cases |
| Chemical | Nuclear reactors, Piping systems, Heat exchangers |
| Power Generation | Steam turbine components, Boiler tubes |
(1) Exhaust system / (2) Motor case / (3) Heat exchanger / (4) Steam turbine parts (cylinders) / (5) Boiler tubes
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