API 571 Exam Questions and Answers
(Latest Update 2026)
a term that refers to a type of metallurgical structure (austenite)
normally found in 300
Series stainless steels and nickel base alloys. -
correct answer ✅Austenitic
the 300 Series stainless steels including Types 304, 304L, 304H,
309, 310, 316, 316L, 316H, 321, 321H, 347, and 347H. The "L" and
"H" suffixes refer to controlled ranges of
low and high carbon content, respectively. These alloys are
characterized by an austenitic structure. -
correct answer ✅Austenitic stainless steels
steels that do not have alloying elements intentionally added.
However, there may
be small amounts of elements permitted by specifications such as
SA516 and SA106, for example that can
affect corrosion resistance, hardness after welding, and toughness.
Elements which may be found in small
quantities include Cr, Ni, Mo, Cu, S, Si, P, Al, V and B. -
correct answer ✅Carbon steel
,API 571 Exam Questions and Answers
(Latest Update 2026)
used in amine treating to remove H2S and CO2 from hydrocarbon
streams. -
correct answer ✅Diethanolamine (DEA)
a family of stainless steels that contain a mixed austenitic-ferritic
structure
including Alloy 2205, 2304, and 2507. The welds of 300 series
stainless steels may also exhibit a duplex
structure. -
correct answer ✅Duplex stainless steel
a term that refers to a type of metallurgical structure (ferrite)
normally found in carbon and
low alloy steels and many 400 series stainless steels. -
correct answer ✅Ferritic
include Types 405, 409, 430, 442, and 446. -
correct answer ✅Ferritic stainless steels
the portion of the base metal adjacent to a weld which has not
been
,API 571 Exam Questions and Answers
(Latest Update 2026)
melted, but whose metallurgical microstructure and mechanical
properties have been changed by the heat of
welding, sometimes with undesirable effects. -
correct answer ✅Heat Affected Zone (HAZ)
describes stepwise internal cracks that connect adjacent
hydrogen blisters on different planes in the metal, or to the metal
surface. No externally applied stress is
needed for the formation of HIC. The development of internal
cracks (sometimes referred to as blister
cracks) tends to link with other cracks by a transgranular plastic
shear mechanism because of internal
pressure resulting from the accumulation of hydrogen. The link-up
of these cracks on different planes in
steels has been referred to as stepwise cracking to characterize the
nature of the crack appearance. -
correct answer ✅Hydrogen Induced Cracking (HIC)
a family of steels containing up to 9% chromium and other alloying
additions for
high temperature strength and creep resistance. The materials
include C-0.5Mo, Mn-0.5Mo, 1Cr-0.5Mo,
, API 571 Exam Questions and Answers
(Latest Update 2026)
1.25 Cr-0.5Mo, 2.25Cr-1.0Mo, 5Cr-0.5Mo, and 9Cr-1Mo. These are
considered ferritic steels. -
correct answer ✅Low alloy steel
term that refers to a type of metallurgical structure (martensite)
normally found in
some 400 series stainless steel. Heat treatment and or welding
followed by rapid cooling can produce this
structure in carbon and low alloy steels. -
correct answer ✅Martensitic
include Types 410, 410S, 416, 420, 440A, 440B, and 440C. -
correct answer ✅Martensitic stainless steel
used in amine treating to remove H2S and CO2 from hydrocarbon
streams. -
correct answer ✅Methyldiethanolamine (MDEA)
used in amine treating to remove H2S and CO2 from hydrocarbon
streams. -
correct answer ✅Monoethanolamine (MEA)
(Latest Update 2026)
a term that refers to a type of metallurgical structure (austenite)
normally found in 300
Series stainless steels and nickel base alloys. -
correct answer ✅Austenitic
the 300 Series stainless steels including Types 304, 304L, 304H,
309, 310, 316, 316L, 316H, 321, 321H, 347, and 347H. The "L" and
"H" suffixes refer to controlled ranges of
low and high carbon content, respectively. These alloys are
characterized by an austenitic structure. -
correct answer ✅Austenitic stainless steels
steels that do not have alloying elements intentionally added.
However, there may
be small amounts of elements permitted by specifications such as
SA516 and SA106, for example that can
affect corrosion resistance, hardness after welding, and toughness.
Elements which may be found in small
quantities include Cr, Ni, Mo, Cu, S, Si, P, Al, V and B. -
correct answer ✅Carbon steel
,API 571 Exam Questions and Answers
(Latest Update 2026)
used in amine treating to remove H2S and CO2 from hydrocarbon
streams. -
correct answer ✅Diethanolamine (DEA)
a family of stainless steels that contain a mixed austenitic-ferritic
structure
including Alloy 2205, 2304, and 2507. The welds of 300 series
stainless steels may also exhibit a duplex
structure. -
correct answer ✅Duplex stainless steel
a term that refers to a type of metallurgical structure (ferrite)
normally found in carbon and
low alloy steels and many 400 series stainless steels. -
correct answer ✅Ferritic
include Types 405, 409, 430, 442, and 446. -
correct answer ✅Ferritic stainless steels
the portion of the base metal adjacent to a weld which has not
been
,API 571 Exam Questions and Answers
(Latest Update 2026)
melted, but whose metallurgical microstructure and mechanical
properties have been changed by the heat of
welding, sometimes with undesirable effects. -
correct answer ✅Heat Affected Zone (HAZ)
describes stepwise internal cracks that connect adjacent
hydrogen blisters on different planes in the metal, or to the metal
surface. No externally applied stress is
needed for the formation of HIC. The development of internal
cracks (sometimes referred to as blister
cracks) tends to link with other cracks by a transgranular plastic
shear mechanism because of internal
pressure resulting from the accumulation of hydrogen. The link-up
of these cracks on different planes in
steels has been referred to as stepwise cracking to characterize the
nature of the crack appearance. -
correct answer ✅Hydrogen Induced Cracking (HIC)
a family of steels containing up to 9% chromium and other alloying
additions for
high temperature strength and creep resistance. The materials
include C-0.5Mo, Mn-0.5Mo, 1Cr-0.5Mo,
, API 571 Exam Questions and Answers
(Latest Update 2026)
1.25 Cr-0.5Mo, 2.25Cr-1.0Mo, 5Cr-0.5Mo, and 9Cr-1Mo. These are
considered ferritic steels. -
correct answer ✅Low alloy steel
term that refers to a type of metallurgical structure (martensite)
normally found in
some 400 series stainless steel. Heat treatment and or welding
followed by rapid cooling can produce this
structure in carbon and low alloy steels. -
correct answer ✅Martensitic
include Types 410, 410S, 416, 420, 440A, 440B, and 440C. -
correct answer ✅Martensitic stainless steel
used in amine treating to remove H2S and CO2 from hydrocarbon
streams. -
correct answer ✅Methyldiethanolamine (MDEA)
used in amine treating to remove H2S and CO2 from hydrocarbon
streams. -
correct answer ✅Monoethanolamine (MEA)
