Hastelloy C UNSN10002/W.Nr. 2.4819 /ASTM B622

Overview

Hastelloy C is a corrosion resistant alloy with many excellent properties which are very resistant to oxidizing and medium reducing corrosion. It has excellent resistance to stress corrosion cracking and good local clothing ability, and has satisfactory corrosion resistance in many chemical process media, including strong corrosion of inorganic acid solution, chlorine and chlorides, dry chlorine, formic acid and acetic acid, sea water and salt water.

Limiting Chemical Composition, %

Nickel (plus Cobalt)...............................................................................................................Balance.

Molybdenum......................................................................................................................15.0-17.0

Chromium...........................................................................................................................14.5-16.5 

Iron......................................................................................................................................4.00-7.00

Tungsten..................................................................................................................................3.0-4.5

Cobalt....................................................................................................................................2.5 max.

Manganese: ........................................................................................................................1.00 max.

Silicon....................................................................................................................................1.0 max.

Vanadium.............................................................................................................................0.35 min.

Copper.................................................................................................................................0.08 max.

Phosphorus.........................................................................................................................0.04 max.

Sulfur:..................................................................................................................................0.03 max.

Physical Constants

Mechanical properties

Corrosion Resistance

Hastelloy C is a high-performance nickel-based alloy material with excellent corrosion resistance. This alloy has good resistance to oxidizing and moderately reducing corrosion, and shows satisfactory corrosion resistance in a variety of chemical process media. Specifically, it has a very high resistance to corrosive media such as strong acid, strong alkali, salt water, and at the same time can maintain stable performance under high temperature and high pressure oxidation environment.

In addition, Hastelloy C also has excellent stress corrosion cracking resistance and good local covering ability, and excellent resistance to moderate sulfuric acid and many non-oxidizing acids, which makes it excellent in the treatment of media including highly etched inorganic acid solutions, chlorine and various media containing chlorides, dry chlorine, formic and acetic acid, seawater and salt water.

This alloy has an extremely low carbon and silicon content, which helps to reduce the precipitation of carbon and other impurity phases in the welding heat affected zone, thereby maintaining the corrosion resistance of the weld. At the same time, by controlling the content of iron and chromium, the formation of β-phase Ni4Mo can be prevented, further enhancing its corrosion resistance.

Therefore, Hastelloy C has been widely used in chemical industry, petrochemical industry, nuclear industry, aerospace, automobile manufacturing, Marine engineering, biomedicine and other fields. In these fields, it is often used in the manufacture of containers, heat exchangers, plate coolers, reactors for acetic and acid products, and high-temperature structural parts.

Heat Treatment

Solution treatment:

Hastelloy C is heated to a solution temperature, usually between 980°C and 1100°C.

It is kept for some time and then cooled rapidly, usually by water quenching or air cooling.

This process can eliminate the precipitated phase in the alloy and improve the plasticity and toughness of the material.

The control of cooling rate is crucial for material properties, too fast cooling may lead to increased brittleness of the material, while too slow cooling may lead to grain growth and phase separation, reducing the strength and toughness of the material.

Aging treatment:

After solution treatment, Hastelloy C is heated to the appropriate temperature and maintained for a period of time.

Then let it cool properly.

This process can further adjust the microstructure and properties of the alloy to improve creep resistance and strength.

Annealing treatment:

Hastelloy C is heated to the appropriate temperature, held for a period of time, and then cooled slowly.

Annealing treatment can eliminate stress and improve the deformation capacity of the material.

Available Forms

We provide you with a variety of product forms, including but not limited to

● Bar & Rod

● Pipe &Tube

● Coil & Strip

● Plate & Sheet/Circle

● Wire & Welding

● Fitting (Flange, Bolts ,Elbow, Tee...)

● Customize