General corrosion rates of castings, Mechanical Engineering

Assignment Help:

Q. General corrosion rates of castings?

Austenitic stainless steels (300 series) are very resistant to caustic in concentrations up to 50% and temperatures below 200oF (95oC). Type 316 L shows improved overall performance over type 304 because of increased resistance to pitting and sensitization.

In caustic service, corrosion is due primarily to caustic stress corrosion cracking (caustic embrittlement) and occurs in the area above the SCC boundary curve. Care must be taken to avoid service conditions within this caustic SCC region. In neutral and acidic services, chloride induced SCC is of major concern. The effect of chlorides is not generally a concern in caustic service where the solution is sufficiently alkaline (e.g. a solution of 0.5 g/L NaOH with a pH of 12).

Cast stainless pumps and valves have performed very well in caustic service and tend to be more resistant to caustic SCC than their wrought equivalents. Minimization of SCC is due to the nature of the cast product. General corrosion rates of castings are similar to those of wrought products.


Related Discussions:- General corrosion rates of castings

Refrigeration, In a steam jet refrigeration system, the ejector extracts 3....

In a steam jet refrigeration system, the ejector extracts 3.3 m3/s of saturated water vapor at a temperature of 7.2 °C from the flash chamber. The return water from the cooling coi

Question.., Two concentric perforared plates are seperated by a 200mm laund...

Two concentric perforared plates are seperated by a 200mm launder and form the flow exit for a clarifier (figure 1). The inlet water flow of 1200 mcubed/hour into the clarifier is

What is metal working processes, Q.What is Metal working processes? Met...

Q.What is Metal working processes? Metal working processes are processes used to produce wrought products. These product include angles, channels, I-beams, round, squar

Hardness of water, hardness of bore well water is less than sea water .ju...

hardness of bore well water is less than sea water .justify

Matter, Matter, particle and body: Matter is anything which occupies s...

Matter, particle and body: Matter is anything which occupies space, possesses mass provides resistance to any stress, example Iron, air, stone, Water. A body of negligible

Supply chain management, Supply Chain Management: In this unit, you ha...

Supply Chain Management: In this unit, you have learned that the supply chain is the network of autonomous and semi-autonomous business entities, which are include through ups

Project, project on solid work 2012 The Final Project is to design a mechan...

project on solid work 2012 The Final Project is to design a mechanical assembly in Solidworks. The design must consist of a minimum of 60 parts, 30 of which must be unique. A uniqu

Computational fluid dynamics package , Cooling of storage tanks: A res...

Cooling of storage tanks: A research involving using a bench top scale wind tunnel to investigate heat losses from storage tanks. A series of small scale model tanks have bee

Define application of drilling machine, Application of Drilling machine ...

Application of Drilling machine Drilling machines of dissimilar capacity and configuration are basically used for originating cylindrical holes and occasionally for enlarging t

Inventor claims in adiabatic system - mechanics, Inventor claims in adiabat...

Inventor claims in adiabatic system: On e inventor claims that 2 kg of air supplied to magic tube at 4 bar and 20°C and the two equal mass streams at 1 bar are produced, one

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