Nickel Calcium

Alloy Description:

No ImageNickel calcium alloy is the alloy of nickel and Calcium produced in form of lumps or granules. which is used as deoxidizer in low alloy steel, stainless steel and nickel based alloy. The chemical composition and physical properties of the alloy is given bellow:

Chemical composition:

Elements Composition (%)
Calcium 9 - 11
Carbon 0.05 max
Iron 0.30 max
Silicon 0.15 max
Lead 0.001
Sulphur 0.001
Nickel Balance

Physical properties:

Specific Gravity 7.3 – 7.6 gm/cm3
Melting point -1190°C
Avpearance Silver Gray

Application & Addition:

Calcium is a universally deoxidizer and desulphurizer. Nickel Calcium alloy facilitate the addition of Calcium to molten bath during production of low alloy steels, stainless steel & heat resistant alloy, and Nickel base alloy. It is used in case where very high demands ore made on the degree of purity and surface quality of the steel or nickel base alloys.

Calcium is not only scavenger for deleterious elements but, when presents as a residual, it can improve ambient and high temperature properties of both ferrous and nickel base alloy.

The effectiveness and usefulness of are both largely influenced by the manner in which the alloy is added in the ladle, it most be done evenly through out the tapping time, and the ladle, by tapping stream. The addition rate of Nickel Calcium alloy is determined by oxygen, sulphur present in the melt and required residual Ca in alloy. Generally the required residual Ca in Austenitic stainless steel is 8 - 10 ppm for good surface finish and castebility.

The advantages to be gained by adding calcium to a wide variety of cast and wrought alloy includes:

  • Effective deoxidation and desulphurization to consistent low level.
  • Sulphide shape control ; improve hot workability in high alloy steel;
  • Improve ingot surface quality for reduced billet grinding
  • Improve mechanical properties and machinability for low alloy steels
  • Increased consistency in resistance wire alloys

The deoxidation and desulphurization is brought by the calcium, while the alloyed nickel act as carrier element. Nickel reduces the vapor pressure of pure Ca at steel melting temperature and dissolved in steel. Nickel Calcium alloy have high melting point (see phase diagram) and density than pure Ca, go deep into the melt and reacts effectively leads to high recovery of Ca.