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  • Total Questions: 151
  • Updated on: Oct 21, 2026
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API API-571 Exam Overview:

Certification Vendor:American Petroleum Institute (API)
Exam Name:Corrosion and Materials Professional Certification Exam
Exam Number:API-571
Real Exam Qty:110 (100 scored, 10 unscored pretest)
Certificate Validity Period:3 years
Passing Score:70% / Scaled score determined by API
Related Certifications:API 510 Pressure Vessel Inspector
API 570 Piping Inspector
API 653 Aboveground Storage Tank Inspector
Exam Format:Multiple-choice questions, Closed-book exam, Computer-based test
Exam Price:$440 USD
Available Languages:English
Exam Duration:195 minutes
Recommended Training:API RP 571 Damage Mechanisms Standard
Exam Registration:API ICP Portal
Prometric Scheduling
Sample Questions: DOWNLOAD DEMO
Exam Way:Computer-based testing (CBT) at Prometric test centers; online proctored option available
Pre Condition:Hold current API 510, 570 or 653 certification; or meet education + experience requirements: BS/BS in engineering/tech + 1 year, 2-year degree + 2 years, high school + 3 years industry experience (past 10 years)
Official Syllabus URL:https://www.api.org/products-and-services/individual-certification-programs/certifications/api571

API API-571 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Uniform or Localized Loss of Thickness25%- Corrosion Under Insulation (CUI)
- Hydrochloric Acid Corrosion
- Ammonium Bisulfide Corrosion
- Oxidation and Scaling
- Sulfidation
Topic 2: Terms, Definitions, and Acronyms5%
Topic 3: Environmentally Assisted Cracking25%- Chloride Stress Corrosion Cracking
- Hydrogen Embrittlement
- Caustic Stress Corrosion Cracking
- Sulfide Stress Cracking
Topic 4: Mechanical and Metallurgical Failure Mechanisms15%- Creep and Stress Rupture
- Mechanical Fatigue
- Thermal Fatigue
- Brittle Fracture
Topic 5: High-Temperature Corrosion and Degradation15%- Decarburization
- Metal Dusting
- Carburization
- Graphitization
Topic 6: Other Damage Mechanisms15%- Microbiologically Influenced Corrosion
- Liquid Metal Embrittlement
- Erosion and Erosion-Corrosion
- Cavitation Damage

API-571 Exam: Frequently Asked Questions

API lists these recommended training resources for the API Corrosion and Materials Professional exam:

Official training plus consistent self-testing is a proven combination — the 151 practice questions from ExamPrepAway handle the second half.

ExamPrepAway issues a full refund if you take the API Corrosion and Materials Professional exam within 60 days of purchase and do not pass. The policy does not apply if the exam is taken within 3 days of purchase, if the exam was never actually taken, or to free materials or expired orders, and the candidate name must match the payer name. Claims require a scan of your enrollment slip and the official Score Report PDF, submitted within 2 days of the exam, and are processed within 7 days. As an alternative, you can exchange for two free exam products of equal value while keeping your original update service. Orders arrive by email within 1 minute — contact support if nothing shows up within 2 hours.

The API Corrosion and Materials Professional exam presents 110 (100 scored, 10 unscored pretest) with 195 minutes to complete them. Practicing under the same clock in the ExamPrepAway Desktop Test Engine makes the real pacing feel routine.

Computer-based testing (CBT) at Prometric test centers; online proctored option available Registration for the API Corrosion and Materials Professional exam goes through these official channels:

After booking, the ExamPrepAway practice questions reach your inbox within 1 minute — preparation can start the same day.

The official API Corrosion and Materials Professional outline defines 6 domains. The leading three are Environmentally Assisted Cracking (25%), Other Damage Mechanisms (15%), and Mechanical and Metallurgical Failure Mechanisms (15%). See the complete list in the topics section above — the 151 practice questions at ExamPrepAway cover every domain.

The API-571 exam is a API certification exam built on the API Corrosion and Materials Professional syllabus shown above. It contributes to these credential paths: API 510 Pressure Vessel Inspector, API 570 Piping Inspector, API 653 Aboveground Storage Tank Inspector. As information technology keeps reshaping how industries operate, certified skills remain one of the most portable proofs of capability in 2026. ExamPrepAway prepares you with 151 practice questions in PDF, Desktop Test Engine, and Online Test Engine formats.

Passing the API Corrosion and Materials Professional exam requires 70% / Scaled score determined by API, and the registration fee is $440 USD. A retake costs the same amount again — a practical reason to verify your readiness with the ExamPrepAway engines before booking.

The full API Corrosion and Materials Professional preparation set at an affordable, small-profits price: 151 practice questions in three formats — a printable, expert-prepared PDF with instant download; a Desktop Test Engine for Windows that simulates the real exam with two practice modes and works offline; and an Online Test Engine for any browser on Windows, Mac, Android, and iOS with test history and performance review. A free demo is available anytime, updates are free for 365 days, renewal afterward is 50% off, installations are unlimited, and checkout is McAfee-secured with automatic encryption of your personal information.

Hold current API 510, 570 or 653 certification; or meet education + experience requirements: BS/BS in engineering/tech + 1 year, 2-year degree + 2 years, high school + 3 years industry experience (past 10 years) Policies change over time, so confirm the current rules on the official API exam page before scheduling.

API Corrosion and Materials Professional Sample Questions:

Phosphoric acid corrosion in polymerization units is usually found under what circumstances?

  • A. When the acid dries out
  • B. Two-phase flow
  • C. Low velocity areas
  • D. Turbulent flows
Reveal Solution  Discussion  0

Correct Answer: A  🗳️

Explanation: Only visible for ExamPrepAway members. You can sign-up / login (it's free).

Corrosion rates of carbon steel pipe in sulfuric acid service increase significantly:

  • A. In stagnant conditions
  • B. At acid concentrations below 65%
  • C. At acid concentrations above 95%
  • D. At acid concentrations above 65%
Reveal Solution  Discussion  0

Correct Answer: B  🗳️

Explanation: Only visible for ExamPrepAway members. You can sign-up / login (it's free).

Proactive and retroactive positive material identification programs are especially useful for services exposed to:

  • A. Ammonia stress corrosion cracking
  • B. Sour water
  • C. Caustic embrittlement
  • D. Sulfidation
Reveal Solution  Discussion  0

Correct Answer: D  🗳️

Explanation: Only visible for ExamPrepAway members. You can sign-up / login (it's free).

A nickel-based buttering layer is often used when welding austenitic stainless steels to carbon steels to avoid dissimilar weld metal cracking because:

  • A. You can avoid the need for post weld heat treatment to lower hardness.
  • B. Austenitic stainless steels are susceptible to chloride cracking.
  • C. Nickel base alloys are much softer than austenitic stainless steels.
  • D. The coefficient of thermal expansion is better suited to avoid cracking.
Reveal Solution  Discussion  0

Correct Answer: D  🗳️

Explanation: Only visible for ExamPrepAway members. You can sign-up / login (it's free).

(Which damage mechanism occurs primarily as a result of exposure of interior vessel surfaces to air and moisture conditions during shutdown?)

  • A. Sour water stress corrosion cracking
  • B. Wet hydrogen sulfide cracking
  • C. Polythionic acid stress corrosion cracking
  • D. Carbonate stress corrosion cracking
Reveal Solution  Discussion  0

Correct Answer: C  🗳️

Explanation: Only visible for ExamPrepAway members. You can sign-up / login (it's free).

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