austenite - Answer-face-centered cubic iron
cementite - Answer-iron carbide (Fe3C) as a phase in steel
ferrite - Answer-body-centered cubic iron
pearlite - Answer-a phase in steel composed of alternating layers of Fe3C (cementite) and ferrite
eutectic - Answer-a phase with a single melt...
MMET 207 Exam Questions with Correct
Answers
austenite - Answer-face-centered cubic iron
cementite - Answer-iron carbide (Fe3C) as a phase in steel
ferrite - Answer-body-centered cubic iron
pearlite - Answer-a phase in steel composed of alternating layers of Fe3C (cementite)
and ferrite
eutectic - Answer-a phase with a single melting temperature
(liquidus and solidus lines meet-not at the axis)
eutectoid - Answer-a solid phase with a single transition temperature to another solid
allotropic - Answer-material has the ability to change crystal structure
rimmed steel - Answer-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 - Answer-strongly deoxidized, usually by chemical additions to the melt
galvanized - Answer-zinc-coated steel products; the zinc is applied by hot dipping
sheet - Answer-rolled steel primarily in the thickness range of 0.010 to 0.25 in and with
a width of 24 in or more
bar - Answer-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 - Answer-rolled steel in the thickness range of sheet or strip
flat wire - Answer-small hot- or cold-rolled rectanges, often by cold-reducing rounds to
rectangular shape
wire - Answer-hot- or cold-drawn coiled rounds in varying diameters, usually not
exceeding 0.25
shapes - Answer-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 - Answer-cold-rolled steel with a usual thickness range of 0.005 to 0.014 in; it
may or may not be tin-coated
strip - Answer-rolled steel primarial in the thickness range of 0.010 to 0.25 in and with a
width of less than 24 in
plate - Answer-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 - Answer-steels with additions of sulfur, lead, selenium, or other
elements in sufficient quantity that they machine more easily than untreated grades
drawing quality - Answer-hot- or cold-rolled steel, specially produced or selected to
satisfy the elongation requirements of deep drawing operations
merchant quality - Answer-steels with an M suffix on the designation intended for non-
structural applications; low quality material
commercial quality - Answer-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 - Answer-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 - Answer-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 - Answer-use of acids to remove oxides and scale on hot-worked steels
Temper Rolling - Answer-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 - Answer-the amount of cold reduction in a rolled sheet and strip
E steels - Answer-Steels with an E prefix on the designation are melted by electric
furnace
nonmetallic inclusions - Answer-oxides, silicates, sulfides, or aluminas that form during
conventional melting and refining
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