1. Introduce
– Ni – Cr – Mo alloy with good resistance to stress corrosion cracking and high temperature oxidizing atmospheres
– Alloy with good resistance to hydrochloric acid, sulfuric acid, and chloride environments
– Reduced C, Si content and addition of stabilizing element Ti for improved intergranular corrosion resistance
– Low C, Si content: stable at 650 ~ 1040℃, improving intergranular corrosion resistance
– UNS N06455
* High C content → Increased amount of carbide precipitation in the grain boundary → Reduced corrosion resistance
* High C, Si content → two-phase formation during solidification → tensile deformation / stress action → high temperature cracking, poor weldability
* UNS
- Abbreviation of 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 N06455 : 06XXX : Chromium (Hastelloy, Inconel, some with additional element)
* Hastelloy
– Corrosion – resistant alloys with Ni as the main component
– Good machinability, weldability
* Hastelloy C
(1) Main composition
– Ni – Cr – Mo
(2) Characteristics
– Oxidation resistance alloy : Excellent oxidation resistance due to the large amount of Cr added
– Excellent corrosion resistance in oxidizing atmospheres such as nitric acid and chlorine due to the addition of a large amount of Cr
2. Property
– Excellent resistance to crevice corrosion and pitting corrosion in oxidizing and non-oxidizing environments
| Element | Impact |
|---|---|
| Ni | Provides corrosion resistance |
| Cr | Provides oxidation resistance |
| Mo | Provides sulfuric acid, hydrochloric acid, and hot oxidation corrosion resistance, hot hardness, weldability, and machinability |
[Hastelloy C4 Chemical Composition (%)]
| Ni | Cr | Fe | C |
|---|---|---|---|
| 58.17 ~ 72.00 | 14.00 ~ 18.00 | Max. 3.00 | Max. 0.01 |
| Ti | Si | Mn | Mo |
|---|---|---|---|
| Max. 0.07 | Max. 0.08 | Max. 1.00 | 14.00 ~ 17.00 |
| S | Co | P | |
|---|---|---|---|
| Max. 0.01 | Max. 2.00 | Max. 0.03 |
[Hastelloy C4 Mechanical properties]
| Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|
| Min. 690 | Min. 276 | Min. 40.00 |
[Hastelloy C4 Physical properties]
| Density (g/cm³) | Melting Range (℃) | Specific Heat (0~100℃) / J/kg*℃ |
|---|---|---|
| 8.64 | 1335 ~ 1380 | 427 |
3. Standard & Specification
– Specification : UNS N06455
| Product Form | ASTM |
|---|---|
| Plate, Sheet, Strip | B575 |
| Bar, Wire, Forgings | B574 |
| Welded Fittings | B366 |
| Pipe, Tube | B617, B622 |
4. Available Form
– Plate & Sheet & Strip
– Bar & Wire & Forging
– Pipe & Tube
5. Application & Product
– Environment, Chemical, Power generation
| Application | Product |
|---|---|
| Environment | Gas desulfurization plants, piping, absorbers, blowers, agitators, heat exchangers |
| Chemical | Heat exchangers, piping, measurement probes, centrifuges |
| Power generation | Piping, heat exchangers, gate valves, nuclear fuel handlers, reactor components, flue gas filters (sulfur smoke cleaning components) |
(1) Piping / (2) Blower / (3) Agitator / (4) Measurement Probe / (5) Centrifuge / (6) Gate Valve
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