Material selection by temperature range, Mechanical Engineering

Assignment Help:

Q. Material selection by temperature range 750° to 1100°F (400° to 600°C) ?

Plain carbon steels are usually limited to a maximum operating temperature of 750°F (400°C).  There are some instances where carbon steels can be used for elevated temperatures, however graphitization may occur over long periods of time.

Low-alloy ferritic steels are commonly used in this slightly higher temperature range.  Alloy additions increase creep and corrosion resistance. Cr-Mo and Cr-Mo-V steels may be used up to 930°F (500°C).  These alloys and C-½Mo steels have higher elevated temperature strengths than the carbon steels of similar content.

For medium and high-pressure turbine rotors, 0.2C-1Cr-1Mo-¼-V steel is commonly used.  For high-pressure steam or where resistance to hydrogen attack is necessary, 2 ¼Cr-1Mo steel and Class II Super 12% Cr steels (high strength), are often used.  The Class I super 12% Cr steels are regularly used as pressure vessel linings having operating temperatures of 500° - 900°F (260° - 480°C).

The stainless steels are used frequently in this temperature range.  The 400 series (ferritic) stainless steels may be subject to 885°F (475°C) embrittlement, if the chromium content exceeds 13%.  Type 410 is used up to 1000°F (540°C) and has moderate strength and good corrosion resistance.  Type 403 is used for steam turbine rotor and gas turbine compressor blades up to 900°F (480°C).  Tempering at 1100°F (595°C) removes the possibility of 885°F (475°C) embrittlement.


Related Discussions:- Material selection by temperature range

Newton''s law of motion - first law, Newton's law of motion. Sol.: T...

Newton's law of motion. Sol.: The entire system of Dynamics is based on the three laws of motion that are basis assumptions, and were initially formulated by Newton. Fir

Resultant of concurrent force system, Resultant of Concurrent Force System:...

Resultant of Concurrent Force System: The resolution of forces helps in finding out the resultant of a number of forces working on a body as it decrease vectorial addition to

Distribution of circumferential stress intensity, A thick cylinder 125 mm i...

A thick cylinder 125 mm inside diameter and 250 mm outside diameter is subjected to an internal fluid pressure of 50N/mm 2 . Determine the maximum and minimum intensities of circum

Som, What is the tesisting force

What is the tesisting force

Varignon theorem - mechanics, Varignon theorem: State Varignon's theo...

Varignon theorem: State Varignon's theorem. How it helps in determining of the moments? In which type of condition is it used? Sol.: Varignon's theorem also called Law

FEM ANSYS Assignment, have assignment in FEM calculation and ANSYS are you ...

have assignment in FEM calculation and ANSYS are you able to solve this kind of assignment

Geometric defects-undercut-excess reinforcement-distortion, Geometric Defec...

Geometric Defects   Undercut Undercut represents a depression into the base metal adjacent to the toe of the weld and if it forms a notch, it is a potential danger for th

Explain parts of the machine of radial drilling, Major parts of the machine...

Major parts of the machine of Radial drilling machine Column The column is cylindrical in shape and built rugged and solid. The column supports the head and the sleeve or

A damped single degree mass-spring system, the spring k2 is attached to a b...

the spring k2 is attached to a base that is moving vertically with displacement y=yo sin(wt).assume x>y.derive the equation of motion .find the natural frequency and derive the ste

Maximum efficiency, A jet strikes tangentially a smooth curved vane moving ...

A jet strikes tangentially a smooth curved vane moving in the similar direction as the jet, and the jet gets reversed in the direction. Prove that the maximum efficiency is slightl

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd