Cast vs Forged vs Bar 1

[nickypaliwal]

We regularly receive request from our vendors to accept one product form for other.

Say plate/sheet machined flanges for forged flanges, cast for forged body etc.

How to judge whether we can accept one form in place of other.

I understand a few concepts such as forged is better than cast etc.

Is there any code or any document which can help me to understand this more precisely ?

 

[FennLane]

There isn't really a straightforward answer as the 'duty' of the parts you are considering will have a significant impact on any decision you make.

It the parts are very lightly loaded and cost is the most important criteria the decision could be easy to make.

If you need high integrity parts with good fracture toughness and fatigue resistance then you may come to a different conclusion.

I don't think one size fits all and making the correct decision needs a detailed evaluation.

 

[nickypaliwal]

I understand that there is no thumb rule for such type of conclusions but can i get some article or something which can at least tell me difference between properties of these product forms. this will help me to make a more confident decision.

 

[arunmrao]

Refer to ASM volume 1 Properties and Selection Iron and Steels.

I'm just one step away from being rich, all I need now is money.
( read somewhere on the internet)

 

[metengr]

The easy answer to this is to review/obtain the various ASME standards; ASME B16.34 for valve bodies, ASME B16.5 for flanges, B16.11 for fittings, etc. These ASME standards have material groupings and referenced material specifications for bar, forgings and castings. All you need to do is obtain the above standards and you have the option for wrought product form to use for a particular material grouping.

 

[tbuelna]

The answer as to which raw material form is acceptable for your particular application should be based on the requirements defined in your contract. If the flange is being used in a fracture critical application, then a cast flange or a flange machined from plate or bar would not likely be acceptable. Only a flange made from a forging would normally be acceptable.

 

[racookpe1978]

What is your background and degree of experience?

You appear to be in fabrication industry - Are you reading and interpreting the specifications already written (like a purchasing or QA division) for a separate fabrication group or company, or are you "building" parts designed by others and by other companies to meet their standards, or are you just starting and are doing the designing yourself?