Chemical constituents of Hastelloy C:
alloy | % | Ni | Cr | Mo | Fe | W | Co | C | Mn | Si | V | P | S |
hastelloy c | minimum | allowance | 14.5 | 15 | 4 | 3 | |||||||
maximum | 16.5 | 17 | 7 | 4.5 | 2.5 | 0.08 | 1 | 1 | 0.35 | 0.04 | 0.03 |
Physical properties of Hastelloy C:
density | 8.94 g/cm3 |
Melting point | 1350 ℃ |
Specific heat capacity | 0.385 103J/kg•K |
Thermal conductivity | 29.3 W(m•K) |
Modulus of elasticity | 210 103MPa |
Mechanical properties of Hastelloy C alloy at room temperature:
Alloy state | Tensile Strength | Yield Strength | ElongatSion |
Bar | 690 | 315 | 30 |
Hot rolled sheet | 690 | 315 | 30 |
Cold rolled plate | 690 | 285 | 40 |
Strip | 690 | 315 | 30 |
Corrosion Resistance of Hastelloy C
1. The corrosion resistance is about 0.1 mm/a in any concentration of sulphuric acid solution below 70 C.
2. At room temperature, the corrosion rate of hydrochloric acid of various concentrations is not higher than 0.1 mm/a; at 65 C, the corrosion rate of hydrochloric acid of various concentrations is also less than 0.5 mm/a.
3. In hydrofluoric acid, the corrosion rate is not more than 0.25 mm/a. Under the condition of 55% H3PO4 + 0.8% HF at boiling temperature, the corrosion rate is more than 0.75 mm/a.
4. In dilute nitric acid of all concentration or higher temperature at room temperature, the corrosion rate is about 0.1 mm/a. Chromic acid, organic acid and other mixed liquids of any concentration at 60-70 C have good corrosion resistance. The corrosion rate is less than 0.125 mm/a and 0.175 mm/a, respectively.
5. It is one of the few materials that can withstand the corrosion of dry and wet chlorine, and can be used under the condition of dry and wet chlorine exchange corrosion.
6. It can resist high temperature HF gas corrosion. The corrosion rate of HF gas below 550 C is 0.04 mm/a, and that of HF gas below 750 C is 0.16 mm/a.
Machinability of Hastelloy C
Hot Processing Technology
1. The hot working temperature ranges from 1200 ~950 C. The cooling mode is water cooling or rapid air cooling.
2. In order to ensure the best anticorrosive performance, heat treatment should be carried out after hot processing, and the workpiece should be directly added to the warmed-up temperature.
Heat treatment furnace.
Cold Processing Technology
1. The work hardening rate is higher than that of austenitic stainless steel, so it is necessary to select the processing equipment. The workpiece shall be in the state of solution heat treatment and shall be annealed in the middle during cold rolling.
2. If the cold rolling deformation is more than 15%, the workpiece needs to be treated by secondary solid solution treatment.
welding technology
Suitable for any traditional welding process, such as inert gas shielded tungsten electrode welding, plasma arc welding, manual sub-arc welding, metal inert gas shielded welding, molten inert gas shielded welding.
Applications of HastelloyC:
Nuclear Energy Industry
Chemical and Petroleum Industries
Vessel heat exchanger and plate cooler
Reactors for Acetic Acid and Acidic Products
High temperature structural parts