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http://site2.wikianswers.com/templates/images/saveBtn_enable.gif?v=48569 The color of mill scale after it is hot rolled is bluish black.
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Many people died of pompeii died of suffocation at the eruption of mt. vesuvius.what cause their suffocation?
To put it simply, it was the cloud of super hot gasses that rolled down on the area, instantly killing anything in its path.To put it simply, it was the cloud of super hot gasses that rolled down on the area, instantly killing anything in its path.To put it simply, it was the cloud of super hot gasses that rolled down on the area, instantly killing anything in its path.To put it simply, it was the cloud of super hot gasses that rolled down on the area, instantly killing anything in its path.To put it simply, it was the cloud of super hot gasses that rolled down on the area, instantly killing anything in its path.To put it simply, it was the cloud of super hot gasses that rolled down on the area, instantly killing anything in its path.To put it simply, it was the cloud of super hot gasses that rolled down on the area, instantly killing anything in its path.To put it simply, it was the cloud of super hot gasses that rolled down on the area, instantly killing anything in its path.To put it simply, it was the cloud of super hot gasses that rolled down on the area, instantly killing anything in its path.
What is HRP stand for in in steel indyustry?
hot-rolled steel plate
How do they make tin foil?
Aluminum foil is made by passing aluminum through a rolling mill. Manufacturers start with a large block several inches thick and several feet wide and long. This block is passed through a rolling mill and is repeatedly hot rolled until it is thin enough for the aluminum to be rolled. The roll is then passed along to another rolling mill and is cold rolled repeatedly until the desired thickness of foil is achieved. In the cold rolling process, two rolls of aluminum are rolled simultaneously to avoid any tearing that might result if a single thickness of aluminum was passed through the rollers. (That's why the foil we see has a "shiny" side and a "dull" side.) Following all this rolling, the aluminum is trimmed and cut to size, and then comes out in the form of the foil we know. Use the link below to see a short video of the process. It's worth the look.
Why does hot water take away the color of the gumball first than warm water?
hot water takes the color away from the gumball first because the hot water is warmer than the cold water
What wire color is hot or power lead?
red
What is process of making hot rolled structural steel?
Plate mill
What must be done to hot-rolled steel in the mill before it can be cold finished?
Hot rolled steel must be descaled by pickling in acid with a lime water rinsebefore it can be cold finished
What is the process called when metals are rolled into thin sheets like aluminum foil?
The process of rolling metals into sheets is called (no surprise) rolling. The metal is passed through a rolling mill and is reduced in size in steps. The metal might be hot rolled or cold rolled, and the choice of process depends on the metal and on what the finished product needs to be like. In the case of aluminum foil, a block of aluminum is first hot rolled, and the metal is passed through the rolling mill a number of times until it is thin enough to be rolled and moved to a cold rolling mill. In the cold rolling mill, it goes through a number of roller sets until the desired thickness is achieved.
What is mill scale?
Mill scale is formed on the outer surfaces of plates, sheets or profiles when they are being produced by rolling red hot iron or steel billets in rolling or steel mills. Mill scale is composed of iron oxides mostly ferric and is bluish black in color. It is usually less than a millimetre thick and initially adheres to the steel surface and protects it from atmospheric corrosion provided no break occurs in this coating. Because it is electro-chemically cathodic to steel, any break in the mill scale coating will cause accelerated corrosion of steel exposed at the break. Mill scale is thus a boon for a while until its coating breaks due to handling of the steel product or due to any other mechanical cause. It is a nuisance when the steel is to be processed. Any paint applied over it is wasted since it will come off with the scale as moisture laden air get under it. Thus mill scale has to be removed from steel surfaces by flame heating, acid pickling or grit/sand blasting. All tedious operations wasteful of energy. This is why shipbuilders used to leave steel delivered freshly rolled from mills out in the open to allow it to 'weather' till most of the scale fell off due to atmospheric action. Now a days most steels mills can supply their produce with mill scale removed and steel coated with shop primers over which welding can be done safely.
Weight difference in hot rolled and cold rolled?
The weight of the two is not much different, generally speaking, cold-rolled sheet is thinner than hot-rolled sheet, if you want to buy cold-rolled sheet or hot-rolled sheet, you can go to the official website of Changzheng, Changzheng's products are of high quality and are the choice of the public. If you want to buy cold rolled sheet or hot rolled sheet, you can go to the official website of Changzeng.
What is the difference between mill scale iron ore fines?
mill scale fines are generated during hot rolling of cast ingot and it can be removed by pickling operation. iron ore fines are naturally available on iron ore and genetared during loading and grinding
What is ST 37 hot rolled or cold rolled steel?
(t)rolled
Difference between Black mild steel and bright mild steel?
from what i can gather, which isn't alot:Cold Rolled Steel Strip is produced, as the term suggests by the further rolling of strip produced by the hot strip mills.Prior to cold rolling, the mill scale has to be removed, normally by the Pickling Process which uses mechanical manipulation (around small diameter rolls) and acid to dissolve the surface scale. The surface is then washed to remove the acid and a light oil added to prevent rusting.Mild steel sheet is manufactured generally in two grades, cold rolled and hot rolled.Hot rolled mild steel sheet is the initial product produced by the steel mill as a downstream process prior to further processing such as cold rolling.Hot rolled mild steel sheet has a mill scale which is usually black in colour. Hence the common name Black Mild Steel Sheet. Black mild steel sheet is commonly used in fabrication shops, it is more economical than cold rolled mild steel sheet.Black mild steel sheet will usually require more preparation work prior to any finishing system being applied.Cold rolling is done to:Reduce the thicknessImprove the surface finishImprove the thickness tolerancesTo offer a range of "tempers"As a preparation for surface coating
Why does hot rolled steel have mill scale?
Hot roll steel has a oxidised mil scale on the surface of the steel as it forms in the upper heat ranges from mixing with oxygen at a steel mill. Upon slow cooling, scale oxides will form a scale mainly of a type of iron oxide(s) usually of 3 distinct layers. This mil scale has a ability to be somewhat porous and can retain some moisture and is more noble in galvanic charges and at some times will potentially cause the underlying steel to corrode. The scale is not uniform in nature and can be loose in some areas and tighter in other areas and can pose a problem for people that want to paint or coat over it. The scale should be removed prior to any painting or TIG welding. Scale can be removed with various acid pickling type applications, flame treating, and mechanical blast or abrasion methods and then the freshly exposed cleaned surface of the reactive steel surface should be then protected from forming a fast acting blush rust.
Is cold rolled harder than hot rolled steel?
They are two different things. Zinc plated means it's coated in zinc. Cold rolled means it's "smashed" into shape without added heat. So you could have something that's cold rolled AND zinc plated!
Explain how color indicates the temperature of a star?
If the star is a bright blue-whit color then the star is hot....but if its red, or a color that's close top red then the it isn't hot, but its not cold either....its just not as hot as the blue-white star is. You can also find this information and more in the Kelvin Scale below.
What does hot rolled and cold worked mean?
hot rolled is a process in which iron alloy heated above recrystallisation temperature to induce desired mechanical , electrical properties like hardness ,toughness , tensile strength, etc..,some hot rolled process are.extruding.,annealing
