Alloy steels, Mechanical Engineering

Alloy Steels:

Carbon steels in their commercial forms all times comprise specific amounts of other elements. A lot of of these elements enter the steel from the ores and it is complex to remove them during the procedure of steel making. Each commercial steels comprise varying amounts of Mn, Si, S and P and frequently varying amounts of that type of elements in Chromium, Nickel, Mo and V. If alloying elements other than carbon is here only in minute amounts as foe illustration: Mn upto 0.8 percent, Si upto 0.3 percent then the steel is commonly called as low alloy steel or plain carbon steel. Sulphur and phosphorus while more than 0.05 percent of also is there, tend to make steel brittle, hence during steel making these elements are decreased to at least such value. Si has slight effect on strength and ductility if less than 0.2 percent is there. As the content is raised to 0.4 percent the strength is raised with no effecting ductility, but above 0.4 percent Si, the ductility is impaired. Si is added as deoxidizer and that part that does not make silicon dioxide keeps in steel like impurity.

Mn is another alloying element such is there in most steels. Whether this exists in solid solution in the ferrite this has a strengthening effect. This may also exist in forms of Mn3C that forms part of the pearlite of MnS. Upto 1 percent of Mn has strengthening effects on steel and Mns presence in excess of 1.5 percent provokes brittleness in steel. Excess Mn is added to melt within steel making to bring its level to desired value. This acts also as a deoxidizer.

Intentional addition of a lot of other elements modifies the structure of steel and thus enhances its properties. Steels to such that intentional additions have been made as comprising those steel that have Mn in excess of 1 percent or Si in excess of 0.3 percent are termed as alloy steels. One exacting effect of alloying is which this enables martensite to be produced with low rates of cooling and permits larger sections to be hardened than is possible with plain carbon steel.

The significant elements that are utilizd to alloy along with steel in varying quantities are Nickel, Cr, Mo, W, Mn and Si. The bcc metals as Chromium, W and Mo while alloyed along with steel tend to form carbides that reduce the proportion of Fe3C in the structure. Conversely the fcc elements as Nickel, Al, Cu and Zr do not form carbides. Mn that has three allotropic difficult structures forms carbide also.

Various advantages in terms of enhanced mechanical properties and corrosion resistance are acquired by adding one or various alloying elements.

Posted Date: 2/26/2013 6:22:25 AM | Location : United States







Related Discussions:- Alloy steels, Assignment Help, Ask Question on Alloy steels, Get Answer, Expert's Help, Alloy steels Discussions

Write discussion on Alloy steels
Your posts are moderated
Related Questions
With the assistance of the airplane information and the Dutch roll approximation values shown in Table Q3: Table Q3 (a)  Determine the Dutch roll eigenvalues. (b)  Dete

Q. Explain about Ducts and Flues in steam generators? All air ducts and gas flues connecting the forced draft fan, fan intake silencer, preheater, and transition piece at the g

Q.   For an electromagnetic system, show that the energy stored in a magnetic field is equal to the area enclosed b/w magnetization curves for open and closed position of the armat

function of helium shielding gas

Give a generalized definition of factor of safety. Illustrate the factors responsible for Un-certainities in design necessitating a suitable factor of safety. How is ‘factor of saf

A sign of uniform density weighs 270 lb and is supported by a ball-andsocket joint at A and by two cables. Determine the tension in each cable and the reaction at A.

Stores for hazardous substances shall be segregated from, and located at a safe distance from accommodation spaces and control room. Indoor storage areas require access from an ope

A tensile test on a specimen having an initial diameter of 13.11 mm and an initial gauge length of 200.0 mm, gave the following data:

Performance criterion of a steam power plant: Sol. :   The design of power plant can be determined largely by the consideration of capital cost and operating cost; the forme

Q. Skid assemblies and modular structures? This specification describes parameters for the design, fabrication, materials and installation of the structural steel part of skid