MMET 207 EXAM I QUESTIONS AND ANSWERS
austenite - Answers :face-centered cubic iron
cementite - Answers :iron carbide (Fe3C) as a phase in steel
ferrite - Answers :body-centered cubic iron
pearlite - Answers :a phase in steel composed of alternating layers of Fe3C (cementite)
and ferrite
eutectic - Answers :a phase with a single melting temperature
(liquidus and solidus lines meet-not at the axis)
eutectoid - Answers :a solid phase with a single transition temperature to another solid
allotropic - Answers :material has the ability to change crystal structure
rimmed steel - Answers :slightly deoxidized steels that solidify with an outer shell on the
ingot which is low in impurities and very sound; can retain a good finish, even after
severe deforming because of the surface cleanliness
killed steel - Answers :strongly deoxidized, usually by chemical additions to the melt
galvanized - Answers :zinc-coated steel products; the zinc is applied by hot dipping
sheet - Answers :rolled steel primarily in the thickness range of 0.010 to 0.25 in and with
a width of 24 in or more
bar - Answers :hot- or cold-rolled rounds, squares, hexes, rectangles and small shapes;
round bars can be as small as 0.25 in; flats can have a minimum thickness of .203 in;
shapes have a maximum dimension less than 3 in
coil - Answers :rolled steel in the thickness range of sheet or strip
flat wire - Answers :small hot- or cold-rolled rectanges,often by cold-reducing rounds to
rectangular shape
wire - Answers :hot- or cold-drawn coiled rounds in varying diameters, usually not
exceeding 0.25
shapes - Answers :hot-rolled I-beams, channels, angles, wide-flange beams, and other
structural shapes;at least one dimension of the cross section is greater than 3 in
, tin plate - Answers :cold-rolled steel with a usual thickness range of 0.005 to 0.014 in; it
may or may not be tin-coated
strip - Answers :rolled steel primarial in the thickness range of 0.010 to 0.25 in and with
a width of less than 24 in
plate - Answers :steel shapes over 0.18 in thick, over 24 in wide and over 0.230 in thick
over 6 in wide, in addition to weight requirements
free machining - Answers :steels with additions of sulfur, lead, selenium, or other
elements in sufficient quantity that they machine more easily than untreated grades
drawing quality - Answers :hot- or cold-rolled steel, specially produced or selected to
satisfy the elongation requirements of deep drawing operations
merchant quality - Answers :steels with an M suffix on the designation intended for non-
structural applications; low quality material
commercial quality - Answers :steels produced from standard rimmed, capped, concast
or semikilled steel. These steels may have significant segregation and variation in
composition, and the are not made to guaranteed mechanical property requirements;
most widely used grade
H Steel - Answers :Steels identified by an H suffix on the designation and made to a
guaranteed ability to harden to a certain depth in heat treatment
B Steels - Answers :Steels with small Boron additions as a hardening agent, there are
identified by a B inserted between the first two and last two digits in the four-digit
identification number (xx B xx)
Pickling - Answers :use of acids to remove oxides and scale on hot-worked steels
Temper Rolling - Answers :Many steels will exhibit objectionable strain lines when
drawn or formed. Temper rolling involves a small amount of roll reduction as a final
p=operation on annealed material to eliminate stretcher strains. This process
sometimes is used to improve the surface finish on a steel product
Temper - Answers :the amount of cold reduction in a rolled sheet and strip
E steels - Answers :Steels with an E prefix on the designation are melted by electric
furnace
nonmetallic inclusions - Answers :oxides, silicates, sulfides, or aluminas that form during
conventional melting and refining
ingot - Answers :a cast shape that will undergo further finishing
austenite - Answers :face-centered cubic iron
cementite - Answers :iron carbide (Fe3C) as a phase in steel
ferrite - Answers :body-centered cubic iron
pearlite - Answers :a phase in steel composed of alternating layers of Fe3C (cementite)
and ferrite
eutectic - Answers :a phase with a single melting temperature
(liquidus and solidus lines meet-not at the axis)
eutectoid - Answers :a solid phase with a single transition temperature to another solid
allotropic - Answers :material has the ability to change crystal structure
rimmed steel - Answers :slightly deoxidized steels that solidify with an outer shell on the
ingot which is low in impurities and very sound; can retain a good finish, even after
severe deforming because of the surface cleanliness
killed steel - Answers :strongly deoxidized, usually by chemical additions to the melt
galvanized - Answers :zinc-coated steel products; the zinc is applied by hot dipping
sheet - Answers :rolled steel primarily in the thickness range of 0.010 to 0.25 in and with
a width of 24 in or more
bar - Answers :hot- or cold-rolled rounds, squares, hexes, rectangles and small shapes;
round bars can be as small as 0.25 in; flats can have a minimum thickness of .203 in;
shapes have a maximum dimension less than 3 in
coil - Answers :rolled steel in the thickness range of sheet or strip
flat wire - Answers :small hot- or cold-rolled rectanges,often by cold-reducing rounds to
rectangular shape
wire - Answers :hot- or cold-drawn coiled rounds in varying diameters, usually not
exceeding 0.25
shapes - Answers :hot-rolled I-beams, channels, angles, wide-flange beams, and other
structural shapes;at least one dimension of the cross section is greater than 3 in
, tin plate - Answers :cold-rolled steel with a usual thickness range of 0.005 to 0.014 in; it
may or may not be tin-coated
strip - Answers :rolled steel primarial in the thickness range of 0.010 to 0.25 in and with
a width of less than 24 in
plate - Answers :steel shapes over 0.18 in thick, over 24 in wide and over 0.230 in thick
over 6 in wide, in addition to weight requirements
free machining - Answers :steels with additions of sulfur, lead, selenium, or other
elements in sufficient quantity that they machine more easily than untreated grades
drawing quality - Answers :hot- or cold-rolled steel, specially produced or selected to
satisfy the elongation requirements of deep drawing operations
merchant quality - Answers :steels with an M suffix on the designation intended for non-
structural applications; low quality material
commercial quality - Answers :steels produced from standard rimmed, capped, concast
or semikilled steel. These steels may have significant segregation and variation in
composition, and the are not made to guaranteed mechanical property requirements;
most widely used grade
H Steel - Answers :Steels identified by an H suffix on the designation and made to a
guaranteed ability to harden to a certain depth in heat treatment
B Steels - Answers :Steels with small Boron additions as a hardening agent, there are
identified by a B inserted between the first two and last two digits in the four-digit
identification number (xx B xx)
Pickling - Answers :use of acids to remove oxides and scale on hot-worked steels
Temper Rolling - Answers :Many steels will exhibit objectionable strain lines when
drawn or formed. Temper rolling involves a small amount of roll reduction as a final
p=operation on annealed material to eliminate stretcher strains. This process
sometimes is used to improve the surface finish on a steel product
Temper - Answers :the amount of cold reduction in a rolled sheet and strip
E steels - Answers :Steels with an E prefix on the designation are melted by electric
furnace
nonmetallic inclusions - Answers :oxides, silicates, sulfides, or aluminas that form during
conventional melting and refining
ingot - Answers :a cast shape that will undergo further finishing
