Melt Shop
The size and composition of a furnace charge in an Integrated Mill Basic Oxygen Furnace.
250 tons, 50% molten iron from blast furnace and 50% scrap
One of the following is NOT a function of the tunnel furnace.
a) Act as a buffer for slab pacing to the hot strip mill
b) Provide adequate soak time for alloy elements to find equilibrium
c) Remove scale from the slab surface
d) Assure proper temperature distribution in the slab
What is c) Remove scale from the slab surface.
There are six of these at BRS.
What are mill stands.
This is why its advantageous to combine the pickle and cold mill processes
a) Reduced opportunity for pickled bands to rust during storage
b) Almost all pickled product is subsequently cold reduced
c) Both lines run at the same speeds
d) All of the above
What is a) reduced opportunity for pickled bands to rust during storage
This method of heat application is employed during in-line anneal at CGL:
a) Radiant tube heat
b) Radiant tube soak
c) Direct fire
d) All of the above
What is d) All of the above
The size and composition of a furnace charge in a BRS Electric Arc Furnace?
What is 150 tons; What is 100% scrap
This is the main function of the caster mold:
a) Cool the skin of the slab so the slab walls freeze
b) Final chance to remove inclusions in the molten steel
c) as a buffer of material to facilitate changing heat vessels
d) Finalize heat chemistry
What is a) Cool the skin of the slab so the slab walls freeze.
This major process function of an Integrated Hot Strip Mill is not required at BRS
What is the Roughing Mill
What is an advantage of cold rolling over hot rolling:
a) Improved surface
b) Requires less energy to reduce thickness
c) Improved microstructure
d) All of the above
What is a) Improved surface
This is the correct sequence for the CGL:
a) Anneal – chem treatment – coating – tension levelling – temper rolling
b) Coating – anneal – tension levelling – chem treatment – temper rolling
c) Anneal – coating – temper rolling – tension levelling – chem treatment
d) Coating – temper rolling – tension levelling – anneal – chem treatment
What is c) Anneal – coating – temper rolling – tension levelling – chem treatment
These two metallic elements are present in scrap can not be removed from a heat in a Ladle Metallurgy Furnace.
Chromium and Copper
This is iron oxides which attach to the surface of the slab.
What is scale.
This is laminar cooling.
What is a Hot Mill system to drench the strip top and bottom with curtains of water.
The term CRFH describes:
a) Cold rolled material that is prime to ship
b) Cold rolled material with minimal gauge reduction
c) Coil products directly after cold mill reduction
What are c) Coil products directly after cold mill reduction
It is advantageous to combine anneal and coating processes because:
a) Batch anneal is restricted to select grades
b) Residual heat of anneal heats the strip before coating
c) “Dead soft” material is a required input at CGL
d) All of the above
What is b) Residual heat of anneal heats the strip before coating
These elements are removed during the RH degassing process.
What are Carbon and Gases (oxygen and nitrogen)
This is the significance of the “peritectic” region in the phase diagram.
a) It is the point at which all three steel phases are present
b) The shrinkage rate of molten steel doubles making it difficult to cast
c) It is the distinction point between iron and steel
d) It is the only region in which steel is stable at room temperature
What is b) the shrinkage rate of molten steel doubles making it difficult to cast
This Hot Mill temperature control (finishing and coiling) does not affect:
a) Gauge control
b) Metallurgical microstructure
c) Mechanical properties
d) Strip shape
What is gauge control
This is a method of shifting rolls side-to-side to affect crown
What is CVC (Continuous Variable Crown)?
This is a characteristic of the zinc pot:
a) A submerged roll is required for effective coating
b) Heat of the zinc in the pot removes any surface contaminates on the strip
c) Coating weight is determined by line speed
d) All of the above
What is a) A submerged roll is required for effective coating
This is NOT a function of the Ladle Met station.
Which is not a function of the Ladle Met station?
a) Add alloying agents to the heat
b) Remove Sulfur from the heat
c) Remove Hydrogen from the heat
d) Maintain required heat temperature
What is c) Remove hydrogen from the heat.
This is the slab thickness range produced in an Integrated Mill compared to the slab thickness range at BRS.
What is 8 – 10 inches for Integrated Mills; What is 55 – 85 mm (2.2 – 3.3 inches) for BRS.
This is an advantage of hot rolling over cold rolling?
a) Improved surface
b) Promotes larger grain growth
c) Lower working force allows larger gauge reduction
d) All of the above
What is c) lower working force allows larger gauge reduction.
What is a major difference between cold rolling and hot rolling?
a) CVC is used on cold rolling only
b) Strip tension is required in cold rolling
c) Cold working does not require back-up rolls
d) Larger gauge reductions can be made in cold rolling
What is b) Strip tension is required in cold rolling
These are the three in-line post coating treatments available on BRS CGL.
What are:
a) temper rolling
b) tension levelling
c) chem treatment