CH6-Mills-gpoe

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What is the primary purpose of cooling the rolls in the rolling process?

To reduce the roll force

To prevent overheating and damage to the rolls (correct)

To enhance the material properties of the rolled product

To increase the roll gap

What is the significance of maintaining the desired temperature during the rolling process?

To enhance the metal grain structure

To increase the rolling speed

To reduce the roll force required

To achieve the desired product properties and dimensional tolerances (correct)

What is the primary difference between primary and secondary mills in the rolling of long products?

Primary mills use cold rolling, while secondary mills use hot rolling

Primary mills produce finished products, while secondary mills produce semis

Primary mills produce semis, while secondary mills produce finished products (correct)

Primary mills use hot rolling, while secondary mills use cold rolling

What is the purpose of the coilers in the rolling process?

To coil the strips into a compact form Signup and view all the answers

What is the primary reason for hot rolling long products?

To facilitate the large reduction in passes Signup and view all the answers

What type of defects are induced during the rolling process?

Rolling defects Signup and view all the answers

Which type of testing equipment is used to detect inside defects in a finished product?

Ultrasonic testing machine Signup and view all the answers

What is the primary purpose of auxiliaries such as cranes, roll tables, and material handling equipment in a mill?

To facilitate the integrated functioning of the mill Signup and view all the answers

What type of steels are produced using both continuous casting and ingot teeming processes?

Special steels including Alloy and Stainless Signup and view all the answers

What is the primary purpose of soaking pits in the hot rolling process?

To heat the ingots to a high temperature before rolling Signup and view all the answers

What is the primary purpose of reheating furnaces in primary long product mills?

To heat the ingots to a temperature above their recrystallization temperature Signup and view all the answers

What is the main difference between the furnaces used in primary long product mills and those used in finishing mills?

The type of furnaces used, batch type or continuous Signup and view all the answers

What is the term used to describe the machines used to straighten metal products?

Roller straightening machines Signup and view all the answers

What is the purpose of inspection in the metal production process?

To ensure that no defective products are sent to customers Signup and view all the answers

What is the primary mode of transportation used to dispatch metal products?

Rail Signup and view all the answers

What is the primary reason for soaking the ingots and continuous cast slab or blooms in soaking pit furnaces?

To achieve uniform temperature and microstructure Signup and view all the answers

What is the purpose of scarfing the bloom in the bloom shear?

To remove hot top and bottom end Signup and view all the answers

What is the significance of the walking beam furnace in the production of stainless steel slabs?

To heat the stainless steel slabs uniformly Signup and view all the answers

What is the primary purpose of using ultrasonic flaw detectors in the inspection of Rail & pipes?

To inspect the internal microstructure of the material Signup and view all the answers

What is the significance of grinding, pickling, or shot blasting in the inspection of rolled bars, billets, and blooms?

To remove surface defects and expose the underlying material Signup and view all the answers

What is the primary purpose of testing samples collected from rolled products?

To evaluate the physical and chemical properties of the material Signup and view all the answers

What is the significance of the cogging mill in the hot rolling process?

To shape the material into the desired form Signup and view all the answers

What is the primary purpose of using 4 high roughing mills in the hot rolling process?

To achieve the required T-Bar thickness Signup and view all the answers

What is the significance of the steckel mill in the hot rolling process of stainless steel slabs?

To shape the stainless steel slabs into the desired form Signup and view all the answers

What is the primary purpose of disposing rolled bars, billets, and blooms based on their grades and final property requirements?

To ensure that the material meets the required specifications Signup and view all the answers

What is the primary purpose of the On-Line Oxidation Furnace in the Sendzimir type Continuous Hot Dip Galvanizing facilities?

Removing oil and grease Signup and view all the answers

What is the main cause of the Orange Peel effect in Cold Rolled products?

Grain structure irregularities Signup and view all the answers

What is the primary function of the Jet Coating system in the Continuous Hot Dip Galvanizing facilities?

Improving zinc coating thickness control Signup and view all the answers

Which of the following defects is most likely caused by incorrect rolling temperature?

Scale Pits/Scabs Signup and view all the answers

What is the primary purpose of the Chemical Treatment in the Continuous Hot Dip Galvanizing facilities?

Preventing atmospheric corrosion Signup and view all the answers

What is the term for the difference in height or thickness of the material before and after rolling?

Draft Signup and view all the answers

What is the term for the ratio of the area before rolling to the area after rolling?

Coefficient of Reduction Signup and view all the answers

What is the principle that states the volume of material remains the same before and after rolling?

Rolling Constant Principle Signup and view all the answers

What is the term for the increase in length of the material after rolling?

Elongation Signup and view all the answers

What is the term for the difference in width of the material before and after rolling?

Spread Signup and view all the answers

What is the primary purpose of cold rolling?

To reduce the thickness of the material Signup and view all the answers

What type of steel plates are produced at the Special Plate Plant (SPP)?

Quenched and tempered special steel plates Signup and view all the answers

What is the purpose of heat treatment in the finished stage of processing?

To achieve desired mechanical properties Signup and view all the answers

What is the purpose of input hot rolled coils testing?

To check for internal defects Signup and view all the answers

What type of rolling mill is used to reduce the thickness of the material in multiple passes?

Reversing mill Signup and view all the answers

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