The Consequence of Element Alloying

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The Consequence of Element Alloying
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Introduction

• There are many alloying elements that are used
  to produce different and precise effects on the
  features that are present in stainless steel
  castings.
• For determining the various grades of steel that
  is available in the market, the study of the
  outcome of the alloying on combing them, heat
  treating and in some cases, impurities present in
  the steel must be conducted.
• The study of these grades gives us an idea about
  what steel is of a better quality and help us
  determine the durability of the product as well.

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Chromium or Cr

• This element is crucial to make the steel
  corrosion resistant. This is why stainless steel
  is called stainless.
• A minimum of 10 percent Chromium content is
  present in all stainless steel.
• Addition of Cr increases the resistance to
  corrosion of the steal.
• The presence of chromium helps in resisting the
  effects of oxidation at higher temperature.
• Chromium also helps in promoting a ferrite
  microstructure.

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Nickel or Ni

• The austenitic microstructure that is present
  in steel is present due to the addition of
  nickel.
• Steel is considered to be highly ductile and
  tough. This quality is imparted to steel due to
  the addition of nickel.
• Adding nickel helps in reducing the rate of
  corrosion of steel in an active state, causing
  steel to become durable in acidic environment.

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• The Nickel is used to create the inter-metallic
  compounds in steel in cases of precipitation
  hardening. This adds immense toughness to the
  steel.
• Addition of nickel and reduction of carbon
  content helps in creating a grade of steel called
  martensitic. This grade of steel is immensely
  helpful in improving the welding ability of the
  steel.

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Molybdenum or Mo

• Adding Molybdenum makes it more resistant to
  localized as well as uniform corrosion.
• When it comes to increasing the mechanical
  strength, Mo increases it slight by adding
  stability.
• Mo creates a ferric microstructure in steel,
  essentially dividing it into grades.
• On the other hand, Mo risks the secondary phase
  formations in austenitic, duplex and ferrite
  steels.

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• However, in martensitic steels, this element
  helps in increasing the hardness of the steel at
  tempering temperatures that are very high. This
  happens as a carbide precipitation effect.

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Copper or Cu

• Cu promotes resistance to corrosion in cases of
  certain acids.
• It helps in promoting an austenitic
  microstructure.
• Cu is generally added for improving the
  machinability.
• Cu also helps in improving formability.

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Manganese or Mn

• Manganese is usually added to improve the hot
  ductility.
• The effect of Manganese on the balance of
  ferrite or austenite differs greatly with the
  rise and fall in temperature.
• At a low temperature, manganese stabilizes
  austenite, and at a high temperature it helps in
  stabilizing ferrite.
• It helps in increasing nitrogens solubility
  power.
• Can also be used to replace nickel.

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Conclusion

• For stainless steel casting, it is important to
  remember the compositions of these elements that
  need to be added.
• With the proper additions quality stainless
  steel can be achieved.
• These all Information may help to any Steel
  Casting Exporters or Manufacturers.

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