C Channel flange question!

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the topic above remind a question i had about channel!anyone here can tell me if the angle that you have on a lot a channel flange is like a standard in the industry and they all have the same angle ? if yes anyone know which angle is supposed to be ? i think its around 15° but im sure someone here can answer me!we had for a job 1 month ago 3 lenght of 40 feets of a really big channel for where i work, it was 18'' large with almost 4 inches flange and half inch web thick (don't remember the right thing)those channel had flange with no angle, it was the same thickness flange for all the 4 inches, almost like a bend plates, is there a reason for this ?if you guys don't understand be gentle and i'll ty to figure a better english or a sketch  haha!Calculator > Bevel Square
Reply:I think you're talking about hot rolled vs cold rolled. The hot rolled, with the thick corners and inside taper on the flange, is made and marketed on a standard web width/flange width and also a 'pound per foot' basis which also equates to some pseudo nominal dimensions when comparing two (let's say) 4 inch channels from different sources. So that taper on the inside if the flange will vary will vary on a given dimensional size depending on the 'pounds per foot'.  Of course don't expect two same sized hot rolled channels to measure identically if made during different time periods (runs) by the same plant or if made by two different plants. Dies get worn, the flanges tend to lean in or out, so-on."The things that will destroy America are prosperity at any price, peace at any price, safety first instead of duty first, the love of soft living and the get rich quick theory of life." -Theodore Roosevelt
Reply:Here maybe this will help.   Link  For Aluminum...  And for steel... LinkMillermatic 251Miller Bobcat 225Lincoln 135Victor Oxy/FuelOlder Thermal Dynamics 50 amp (paid $700 with 10 sets of consumables)
Reply:i found a little information about what im searching for, those 2 type of flange are called ''paralell flange'' for the equal thickness flange and ''non-paralell flange'' for the one with a small angle!still searching for REASON why there is 2 different!Calculator > Bevel Square
Reply:In the designation of HR Channels, a letter or letters precedes the size and weight per foot, ie: C3 x 4.1# is the AISI designation for a channel 3" wide at its base and 4.1 pounds weight per foot standard structural channel. "C" shapes are channels produced in accordance with dimensional standards adopted in 1896 by the Association of American Steel Manufacturers for American Standard channels. The essential part of these standards is that the inside flange surfaces of American Standard channels have approximately a 16-2/3% slope. "MC" shapes are channels that cannot be classified as "C" shapes.    Copied from here http://www.speedymetals.com/information/Material67.html
Reply:so i was almost right with my 15°, thats the accurate answer i wanted, thanks for this!!!Calculator > Bevel Square
Reply:Originally Posted by LayoutMani found a little information about what im searching for, those 2 type of flange are called ''paralell flange'' for the equal thickness flange and ''non-paralell flange'' for the one with a small angle!still searching for REASON why there is 2 different!
Reply:These things are from a rolling mill coming through the final pass at a red heat.  There is not a great deal of accuracy.  There are washers for such flanges.http://www.grainger.com/Grainger/Squ...d-Washer-2DE66Standard channels are much easier to roll to shape than heavier ship channels.  In the same way a standard I beam section with tapered flanges is not as complex to make as a modern wide flange beam that does not have tapered flanges.
Reply:Originally Posted by lotechman. . .There are washers for such flanges. . . .
Reply:if im understand right, the 16 - 2/3% of slope = 16 - 2/3% divided by 100 = (1/6) 2nd fonction TAN = 9.46°i did the math for fun on the washer that you gave the link Lotechman and had about a deg of 9.86° (wich is really similar) so i think i have my answer!Calculator > Bevel Square