What is Hastelloy C-4?

Hastelloy C-4 (UNS N06455) is a nickel-based superalloy with excellent corrosion resistance and high temperature performance. This article will introduce in detail the chemical composition, production standards, corrosion resistance, high temperature resistance, typical application range, hot processing, cold processing, heat treatment, machining, welding, recommended welding materials, material specific gravity, melting point, hardness, Annealing temperature, recommended forging temperature range, turning tools, available product range.

##Hastelloy C-4 alloy chemical composition

The main chemical composition of C-4 alloy is as follows:

- Nickel (Ni): ≈65%
- Chromium (Cr): 14.0-17.0%
- Molybdenum (Mo): 14.0-17.0%
- Iron (Fe): ≤3.0%
- Silicon (Si): ≤0.08%
- Carbon (C): ≤0.01%
- Manganese (Mn): ≤1.0%
- Titanium (Ti): ≤0.7%
- Copper (Cu): ≤0.5%
- Cobalt (Co): ≤2.0%
- Aluminum (Al): ≤0.5%
- Boron (B): ≤0.006%
- Sulfur (S): ≤0.01%

## Hastelloy C-4 alloy production standards

The production standards of C-4 alloy mainly include ASTM B575, ASTM B619, ASTM B622, etc.

## Hastelloy C-4 alloy corrosion resistance

C-4 alloy has excellent corrosion resistance, especially in chloride environments. It performs well in many acidic environments such as sulfuric acid, nitric acid, hydrochloric acid and phosphoric acid. The corrosion resistance of the alloy is mainly due to its high content of chromium, rhenium and nickel. In addition, C-4 alloy also has good oxidation resistance.

## Hastelloy C-4 alloy high temperature resistance

Hastelloy C-4 alloy has good mechanical properties and stable chemical properties in high temperature environments. It can maintain high strength in high temperature environments, has a low thermal expansion coefficient and good thermal conductivity. This makes C-4 alloy an ideal material for many high temperature applications.

## Typical application range of Hastelloy C-4 alloy

C-4 alloy is widely used in chemical industry, petroleum, seawater treatment, aviation, nuclear industry and other fields. Typical applications include:

- Chemical process equipment
- Petroleum refining equipment
- Seawater treatment equipment
- heat exchanger
- Acid making equipment
- High temperature furnace equipment
- Gas turbine components

## Hastelloy C-4 alloy hot processing

C-4 alloy has good hot workability. The recommended forging temperature range is 1150-950℃. During the forging process, low forging temperatures should be avoided to prevent cracks in the alloy.

## Hastelloy C-4 alloy cold processing

C-4 alloy has good cold working properties and can be processed by conventional cold working methods, such as cold rolling, cold drawing, cold forging, etc. Cold working can improve the strength and hardness of the alloy, but it should be noted that the cold-worked alloy may need to be annealed to restore its plasticity.

## Hastelloy C-4 alloy heat treatment

The heat treatment of C-4 alloy mainly includes solution treatment and annealing treatment. The solution treatment temperature range is 1050-1100℃, the holding time is 1-3 hours, and then quickly cooled. The annealing temperature range is 950-1050°C, the holding time is 1-3 hours, and then gradually cooled.

## Hastelloy C-4 Alloy Machining

C-4 alloy has good machining properties and can be used for conventional machining operations such as turning, milling, drilling, grinding, etc. During the machining process, appropriate cutting speeds, feed rates, and cutting fluids need to be used to ensure machining quality and tool life.

## Hastelloy C-4 alloy welding

C-4 alloy has good welding properties and can be welded by gas tungsten arc welding (GTAW), gas metal arc welding (GMAW), manual arc welding (SMAW) and other welding methods. The recommended filler material is ERNiCrMo-3, which provides similar weld properties to C-4 alloy.

## Hastelloy C-4 alloy physical properties

The physical properties of C-4 alloy are as follows:

- Material specific gravity: 8.64g/cm³
- Melting point: 1350-1400℃
- Hardness: about 200-220HV
- Annealing temperature: 950-1050℃
- Recommended forging temperature range: 1150-950℃

## Turning tools

When turning C-4 alloy, it is recommended to use carbide tools, which have high wear resistance and wear resistance. At the same time, the use of cutting fluid is crucial to improve machining results and extend tool life.

## Hastelloy C-4 alloy product range available

The product range of C-4 alloy includes: plates, bars, pipes, wires, forgings, etc.

Tianjin Anton Metal Manufacture Co., Ltd. is a company specializing in the production of various nickel-based alloys, Hastelloy alloys and high-temperature alloy materials. The company was established in 1989 with a registered capital of 10.0 million, specializing in the production and sales of alloy materials. Anton Metal’s products are widely used in aerospace, chemical industry, electric power, automobile, nuclear energy and other fields, and can also provide customized alloy material solutions according to customer needs. If you need to know the price consultation of alloy materials or provide customized alloy material solutions, please feel free to contact the sales staff.

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