Modern Steel Products (2014) - Structural Steel and Rail: lecture 25


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Modern Steel Products (2014) - Structural Steel and Rail: lecture 25
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25 (2014)
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Cooman, Bruno C. de
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University of Cambridge
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Professor de Cooman takes the topic of long product manufacture, including rails. Both the production and metallurgy of the alloys is described. This is a part of a course of lectures given at the Graduate Institute of Ferrous Technology, POSTECH, Republic of Korea.
The Graduate Institute of Ferrous Technology (GIFT)
Guard rail Mining
Typesetting Computer animation Ship class Continuous track Cartridge (firearms) Guard rail Spare part Rolling (metalworking) Wire Ship of the line Steel Material Handle (grip)
Semi-finished casting products Trimmen Bloomery Casting defect Angle of attack Angle of attack Computer animation Surface mining Spare part Continuous casting Molding (process) Ship of the line Sheet metal Photographic plate Boeing 747
Angle of attack Semi-finished casting products Sonic boom Computer animation Surface mining Trimmen Binoculars Bloomery Casting defect Photographic plate
Angle of attack Kopfstütze Computer animation Screw Steel
Angle of attack Kopfstütze Computer animation Screw Dashboard Guard rail Engine Locher Steel
Angle of attack Kopfstütze Computer animation Tau Guard rail Steel
Typesetting Outsourcing Computer animation Cartridge (firearms) Wear Guard rail
cultural steals in rail and hopefully I can wrap this up to die in about an hour and then on on Tuesday
I will will talk about the place products and in particular the flanked by the so line by being very important nowadays steel industry it might be of entrust to you to 1 you definitely attend tried to attend the classes and even tho there you know there will be no queers related to the material of choosing so what are these the so-called long products basically we're talking about structural beams and
rails but what will see 2 days talk about male designs for beans and rails we'll see sorry get very characteristic for the type of product that is being made here In contrast to what happens to bar and wire products they producer of rail and the structural beams makes the end product that is ready for use In an application for residence is in the grip of the railroad tracks and so will talk about shape rolling that's Porter a part of the process here of producing struggle beams and rails entered and so will end and will underline the fact that for structural strength is important that's the main thing but in the case of rails there is an additional requirement actually a more important requirement then just strength that its hardness look at what would be tied to the products look like that we are talking about what you
are all familiar with IBM's widely used in the and seen on construction sites piles sheets knows if you want to make some kind of wall the 2 walls supporter walls make harbor fronts etc and he's piled sheets of this very it into important detail here this the curved apart that allows them to that allows you to walk them together channels and angles and industry things are very common thank you see you'll of construction slump sites right so these beings channels piled and angles L start
their production in continuous annealing at a continuous injury continuous casting their lines where you produce blooms yes and I nowadays but you also produced being able acts and you can see the advantage of producing a being blanked you already have a part of the general shape of the product in the casting him and so on how how how a Donald simply you the the continuous casting mold has the shape of this it's
called dog bone shapes and you know what comes out is is basically already free shaped Bloomberg no good it's a the but a basically could also use slabs most of the time I use billets
or blooms Audi's that being blacks and and eat their roles in a special merits in specially Mills specially designed males and of course and you have to have a specially designed role passes will talk about this and so let's have a look at the some general things
about what kind of steel grades do we use for these long products well
basically they're not very complicated products in terms of the metallurgical and so if you look at you here is our age
beings channels bungles and a typical
grades that you would be using so let's have a look at how the European versions of the standards because they will give you information about what typical strengths we're talking about and yield strength 235 335 this are not extremely high-strength steels yes although Els who and will close with that today but there is definitely a trend to increase strength also in structural steels for for a long product rails for rails we have different notes set went into the hole rail road rail industry has its own standards for steals yes and so you have for instance costs in France European Union you have the European normalization yes that is just the same as you have structural steels in in the U.S. that refer to as a rematch which stands for American Railway Engineering and Maintenance of Way Association again this professional engineering organization that's dealing with rail
road and infrastructure equipment and so let's have a look at these rails steel properties L it's
important specifications yeah railroads are depend on
geographically very different from the you have very dense railroad networks in Europe the used for transport but also for a friend yes and so you have in North America railroads are used mainly for freight yeah so you have a very very heavy loads on the on the rails and the very heavy so you basically hauling a lot of stuff over the railroads and the passenger type of railroads much much less important in In in North America and so and and because of historic reasons but you know these European and standardize Asians are important there is 1 that's famous it's to you the UIC which stands for in your international edition meant affair that's the all the international body DEC has standards for the rails and then there's an European normalization standard also were so what do we see here yes In a few use look at these this European standard degrade named yes this is this salary as in Europe Europe so that starts with the letter that was referring to the application so if you if it starts with an art refers to rail against and very often the number that follows this denomination this great name is a number usually In these European of standards it's refers to yield strength source strength and my property in this case it doesn't it refers to harden its it refers to hardness and bring now hardest on the Brunell hardness scale right and I am there and the reason is because of our our rails are very heavily subjected to wear that's where 1 and fatigue that wear and fatigue at center OK so what do we know the it sea as a strength levels again not nothing very excessive yen and it depends also on what


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