Heat treatment of stainless steels, Mechanical Engineering

Heat Treatment of Stainless Steels:

Stainless steels, as other steels, react to heat treatments over broad range. They are subjected to one or more of the given heat treatments.

Stress Relief

This relieving treatment eliminates undesirable residual tensile stresses such are induced in the material like consequence of mechanical working.

Stainless steels stress relieving is carried out via heating it to 370oC and after that cooling at a low rate. This treatment also decreases susceptibility to corrosion. Though, resistance against corrosion cracking is enhanced by stress relieving at 770oC.

Annealing

As ferritic stainless steels are prone to form patches of transformation products mostly after welding this is subjected to annealing treatment. The treatment is carried out via heating ferritic steel to 770oC and then cooling it in furnace or air. Such treatment will stress relieve and homogenized the structure.

Solution Annealing

Such treatment is illustrates to austenitic stainless steel. Whilst this steel is heated to 1000oC to 1120oC the austenite proceeds as a powerful solvent for chromium carbide and makes a homogenous structure. Homogenous structure is retained via quenching heated steel in water, air or oil depending upon the thickness of the section. Air is suitable quenching media for thin sections. The procedure is also concerns to as quench annealing.

Hardening and Tempering

Such treatment extremely same to one for plain carbon steel but simply meant as martensitic stainless steel. The steel is heated to a temperature of 950 to 1050oC and quenched in oil or air resulting in hard marteniste formation. The quenched steel is tempered in between 100 and 700oC depending on the needed hardness.

Stabilizing Treatment

This is individual treatment for austenitic steel's stabilized grade. The steel is heated to 870 to 900oC and held for 2 to 4 hours. This is after that quenched in, oil or air water that causes precipitation of columbium or titanium carbide. These carbides do not allow precipitation of chromium carbide during service life.

Post Weld Treatment

The welding induces unneeded residual stresses and decrease corrosion resistance. Stress annealing, solution or relieving annealing are the treatments recommended for weldments before putting them to utilize. Weld decay is a usual welding defect in stainless steel such is reasoned by precipitation of carbide of chromium in the weld area and HAZ. The consequence of this precipitation is great susceptibility to intercrystalline cracking while a corrosive media comes in contacts.

Posted Date: 2/26/2013 6:43:32 AM | Location : United States







Related Discussions:- Heat treatment of stainless steels, Assignment Help, Ask Question on Heat treatment of stainless steels, Get Answer, Expert's Help, Heat treatment of stainless steels Discussions

Write discussion on Heat treatment of stainless steels
Your posts are moderated
Related Questions
It is estimated that the average number of surface defects in 20 square meter of paper produced by process is 3.what is probability of finding number more than 2 defects in 40 squa

Determine Strain energy stored in coiled helical spring: For a close coiled helical spring subjected to an axial load of 200 N with 10 coils of wire of diameter 18 mm and buil

how to make a vapour absorber?

Q. Can you explain Investment casting? -Investment casting produces very high surface quality and dimensional accuracy. -Investment casting is commonly used for precision eq

Find out ratio of  upper end area to lower end area  of bar of uniform strength Sol : The figure given to us shows a bar subjected to external tensile load P. If bar had be

Screw Conveyors: Screw conveyors are used principally for transmitting materials in the form of powder or paste with the application of rotating screw. For example feedin

Mechanical failure is one of the most important factors causing component/structure/product no longer fit for its intended purpose. Use examples to explain at least three modes o

Ideal Speed Circuit ( 36 to 40 kmph ) : Motorcycle is brought into this condition by raising the throttle valve and an incorporated jet needle. The air enters through the main pa

What are the factors responsible for the development of newer tool materials. Explain several materials used for cutting tools. List four kinds of tool wear.

Q. Explain about Napthenic Acid Corrosion? Some crude oils contain napthenic acids, which, at elevated temperatures, may contribute to more active corrosion with or without the