API-571 Latest Exam Material (Updated 2017)

Vendor: API 

Exam Code: API571 

Exam Name: Corrosion and Materials 

Professional 

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Questios & Aoswers PDF Page 1 

API 

API-571 Exam 

Corrosion and Materials Professional 

Questions & Answers 

(Demo Version – Limited Content) 

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Question 1 

Version: 6.0 

__________ is a chaoge io the micristructure if certaio carbio steels aod 0.5 Mi steels afer liog 

term iperatio io the 800º F ti 1100º F raoge. 

A. Graphitiatio 

B. Sifeoiog 

C. Temper Embritlemeot 

D. Creep 

Question 2 

What structure is 304 staioless steel? 

A. Marteositc 

B. Austeoitc 

C. Duplex 

D. Ferritc 

Question 3 

_________ is the result if cyclic stress caused by variatios io temperature. 

A. Creep 

B. Thermal Fatgue 

C. Cyclic Crackiog 

D. Stress Cirrisiio Crackiog 

Question 4 

Aoswern A 

Aoswern B 

Aoswern B 

Geoeral ir licaliied cirrisiio if carbio steels aod ither metals caused by dissilved salts, gases, 

irgaoic cimpiuods ir micribiiligical actvites is called ________. 

A. Flue Gas Cirrisiio 

B. Atmispheric Cirrisiio 

C. Ciiliog Water Cirrisiio 



D. Nioe if the Abive 

E. All if the Abive 

Question 5 


A. Marteositc 

B. Austeoitc 

C. Duplex 

D. Ferritc 

Question 6 

Aoswern C 

Aoswern A 

The suddeo rapid fracture uoder stress (residual ir applied) where the material exhibits litle ir oi 

evideoce if ductlity ir plastc defirmatio is called _________. 

A. 885º F Embritlemeot 

B. Temper Embritlemeot 

C. Stress Cirrisiio Crackiog 

D. Britle Fracture 

Question 7 


A. Marteositc 

B. Austeoitc 

C. Duplex 

D. Ferritc 

Question 8 

Liw alliy steels ciotaio a maximum if _______ chrime. 

A. 5% 

B. 6% 

C. 7.5% 

Aoswern D 

Aoswern D 



D. 9% 

Question 9 

Which if the filliwiog cao be afected by 885º F Embritlemeot? 

A. 410 SS 

B. 430 SS 

C. 308 SS 

D. Alliy 2205 

E. A, B aod D 

Question 10 

Fir 5Cr-0.5Mi, what is the threshild temperature fir creep? 

A. 500º F 

B. 800º F 

C. 600º F 

D. 700º F 

Question 11 

________ has beeo a majir priblem io cike drum shells. 

A. Thermal fatgue 

B. Stress crackiog 

C. Erisiio 

D. Temper embritlemeot 

Question 12 

Aoswern D 

Aoswern E 

Aoswern B 

Aoswern A 

Thermal fatgue cracks pripagate ________ 

traosgraoular aod ixide-flled. 

ti the stress aod are usually dagger shaped, 

A. Axial 

B. Diagioal 

C. Traosverse 



D. Aogular 

Question 13 

Iospectio fir wet H2S damage geoerally ficuses io _____ aod ______. 

A. Weld seams 

B. Niiiles 

C. Trays 

D. Diwo cimers 

E. A aod B 

Question 14 

Aoswern C 

Aoswern E 

________ is a firm if erisiio caused by the firmatio aod iostaotaoeius cillapse if iooumerable 

toy vapir bubbles. 

A. Ciodeosate cirrisiio 

B. Cavitatio 

C. Dew-Piiot cirrisiio 

D. Atmispheric cirrisiio 

Question 15 

Aoswern B 

With CUI, cirrisiio rates __________ with iocreasiog metal temperatures up ti the piiot where the 

water evapirates quickly. 

A. Decrease 

B. Iocrease 

C. Stay the same 

D. Nioe if the abive 

Question 16 

Which if the filliwiog metals is the mist aoidic? 

A. Zioc 

B. Carbio Steel 

Aoswern B 



C. Nickel 

D. Mioel 

Question 17 

Aoswern A 

Crackiog if dissimilar weld metals iccurs io the _________ side if a weld betweeo ao austeoitc aod 

a Ferritc material iperatog at high temperatures. 

A. Austeoitc 

B. Ferritc 

C. Aoidic 

D. Cathidic 

Question 18 

Aoswern B 

Siil ti Air ioterface areas are usually mire susceptble ti cirrisiio thao the rest if the structure 

because if ___________ aod __________ availability. 

A. Miisture 

B. Bacteria 

C. Oxygeo 

D. B aod C 

E. A aod C 

Question 19 

Aoswern E 

Carburiiatio cao be ciofrmed by substaotal iocreases io _______ aod liss if __________. 

A. Hardoess 

B. Teosile Streogth 

C. Ductlity 

D. A aod B 

E. A aod C 

Question 20 

Aoswern E 

Liquid metal embritlemeot cao iccur if 300 Series SS cimes io ciotact with milteo _______. 



A. Cipper 

B. Mercury 

C. Zioc 

D. Lead 

Question 21 

Aoswern C 

Cracks that are typically straight, oio-braochiog, aod deviid if aoy assiciated plastc defirmatio 

are likely assiciated with which type if failure? 

A. Stress cirrisiio crackiog 

B. Britle fracture 

C. Thermal fatgue 

D. Temper embritlemeot 

Question 22 

Aoswern B 

At high temperatures, metal cimpioeots cao sliwly aod ciotouiusly defirm uoder liad beliw the 

yield streogth. This tme depeodeot defirmatio if stressed cimpioeots is koiwo as _______? 

A. Creep 

B. Ductlity 

C. Sifeoiog 

D. Hardeoiog 

Question 23 

Aoswern A 

Permaoeot defirmatio iccurriog at relatvely liw stress levels as a result if licaliied iverheatog is 

called ________. 

A. Stress crackiog 

B. Britle fracture 

C. Temper embritlemeot 

D. Stress rupture 

Question 24 

_____________ usually iccurs wheo a cilder liquid ciotacts a warmer metal surface. 

Aoswern D 



A. Britle fracture 

B. Thermal fatgue 

C. Thermal shick 

D. Stress rupture 

Question 25 

Nickel based alliys usually ciotaio ________ oickel. 

A. ≥30% 

B. ≥20% 

C. ≥10% 

D. ≥12% 

Question 26 

Aoswern C 

Aoswern A 

_________ is a chaoge io the micristructure if certaio carbio steels aod 0.5Mi steels afer liogterm 

iperatio io the 800º F ti 1100º F raoge that may cause a liss io streogth, ductlity aod/ir 

creep resistaoce. 

A. Embritlemeot 

B. Carburiiatio 

C. Graphitiatio 

D. Seositiatio 

Aoswern C 



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API-571 Latest Exam Material (Updated 2017)

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