The API Corrosion and Materials Professional exam has a reputation for tripping up even experienced candidates. Working through 151 realistic practice questions from ActualCollection exposes your weak spots before exam day does.
API API-571 Exam Overview:
| Certification Vendor: | American Petroleum Institute (API) |
|---|---|
| Exam Name: | Corrosion and Materials Professional Certification Exam |
| Exam Number: | API-571 |
| Passing Score: | 70% / Scaled score determined by API |
| Certificate Validity Period: | 3 years |
| Available Languages: | English |
| Exam Format: | Multiple-choice questions, Computer-based test, Closed-book exam |
| Exam Duration: | 195 minutes |
| Exam Price: | $440 USD |
| Related Certifications: | API 570 Piping Inspector API 510 Pressure Vessel Inspector API 653 Aboveground Storage Tank Inspector |
| Real Exam Qty: | 110 (100 scored, 10 unscored pretest) |
| Recommended Training: | API RP 571 Damage Mechanisms Standard |
| Exam Registration: | Prometric Scheduling API ICP Portal |
| Sample Questions: | ![]() |
| 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:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Other Damage Mechanisms | 15% | - Liquid Metal Embrittlement - Cavitation Damage - Microbiologically Influenced Corrosion - Erosion and Erosion-Corrosion |
| Topic 2: High-Temperature Corrosion and Degradation | 15% | - Graphitization - Carburization - Decarburization - Metal Dusting |
| Topic 3: Uniform or Localized Loss of Thickness | 25% | - Oxidation and Scaling - Ammonium Bisulfide Corrosion - Hydrochloric Acid Corrosion - Sulfidation - Corrosion Under Insulation (CUI) |
| Topic 4: Mechanical and Metallurgical Failure Mechanisms | 15% | - Creep and Stress Rupture - Mechanical Fatigue - Brittle Fracture - Thermal Fatigue |
| Topic 5: Environmentally Assisted Cracking | 25% | - Caustic Stress Corrosion Cracking - Hydrogen Embrittlement - Chloride Stress Corrosion Cracking - Sulfide Stress Cracking |
| Topic 6: Terms, Definitions, and Acronyms | 5% |
Answers Every API-571 Candidate Should Read First
The API Corrosion and Materials Professional exam is the official American Petroleum Institute (API) test registered under exam code API-571. Passing it earns you the Corrosion and Materials Professional certification, a credential at the Professional level. It is also linked to the related certifications: API 510 Pressure Vessel Inspector, API 570 Piping Inspector, API 653 Aboveground Storage Tank Inspector. American Petroleum Institute (API) exams are valued because they test job-ready skills, so a passing score here carries real weight on a resume.
The API Corrosion and Materials Professional exam includes 110 (100 scored, 10 unscored pretest) questions to be completed within 195 minutes. Do the pacing math before exam day: with that many items on the clock, you need a steady rhythm and the discipline to flag a hard question and move on instead of stalling. Two or three full timed sessions with the ActualCollection test engine will show you exactly what that pace feels like, so time pressure stops being a factor on the real day.
To pass the API Corrosion and Materials Professional exam you need 70% / Scaled score determined by API, and the official registration fee is $440 USD. A retake is not discounted: a failed attempt means paying the full $440 USD again, so treat your first sitting as the expensive one. A sensible rule is to book your seat only after you are scoring comfortably above the passing mark on the ActualCollection practice tests, not just squeaking past it once.
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)
Eligibility rules do change from time to time, so confirm the current requirements before you register on the official exam page.
Registration for the API Corrosion and Materials Professional exam goes through the official channels below.
As for the delivery format, the exam is taken Computer-based testing (CBT) at Prometric test centers; online proctored option available.
American Petroleum Institute (API) points candidates toward the following training options for API Corrosion and Materials Professional.
Course work builds the foundation; question practice makes it stick. The 151 practice questions in the ActualCollection API-571 package let you rehearse each topic under exam-style pressure before the real thing.
Yes. ActualCollection offers a free PDF demo of the API Corrosion and Materials Professional material so you can judge the question quality and format before spending anything. After purchase, your license includes 365 days of free updates, and if you want to keep receiving updates after that period, renewals are available at a 50% discount.
If you take the API Corrosion and Materials Professional exam within 60 days of your purchase and do not pass, ActualCollection backs you with a 100% money-back guarantee. The claim must match the exam your product covers: attempts taken within 3 days of purchase are not eligible (that is too little preparation time), and neither are downloaded-but-unused products, free materials, or expired orders. The candidate name must match the payer name, and you need to submit a scanned enrollment slip plus the official Score Report PDF within 2 days of the exam; claims are processed within 7 days. Prefer not to refund? You can swap instead and receive two other exam products of equal value for free while keeping the update service on your original purchase.
Delivery itself is instant: your files are downloadable right away and emailed to you within one minute of payment. If nothing arrives within 2 hours, contact customer service. There is no limit on how many computers you may install the software on.
The official API Corrosion and Materials Professional syllabus is organized into 6 domains. Key areas include Environmentally Assisted Cracking (25%), Uniform or Localized Loss of Thickness (25%), and Other Damage Mechanisms (15%). The complete, up-to-date topic list appears in the exam topics section above; work through it line by line and flag anything you cannot yet explain in your own words.
API Corrosion and Materials Professional Sample Questions:
At what minimum level of nickel content does an alloy become nearly immune to chloride stress corrosion cracking?
- A. 20%
- B. 45%
- C. 12%
- D. 35%
Correct Answer: D 🗳️
Explanation: Only visible for ActualCollection members. You can sign-up / login (it's free).
Blistering and hydrogen-induced cracking (HIC) damage are most affected by what aspect of steels?
- A. Inclusions
- B. Hardness
- C. Permeability
- D. Residual Stress
Correct Answer: A 🗳️
Explanation: Only visible for ActualCollection members. You can sign-up / login (it's free).
Erosion and erosion-corrosion metal loss is characterized by:
- A. smooth pits.
- B. linear striations.
- C. rough pits and pock marks.
- D. grooves and gullies.
Correct Answer: D 🗳️
Explanation: Only visible for ActualCollection members. You can sign-up / login (it's free).
Which of the following statements about high-temperature hydrogen attack is most accurate?
- A. High-temperature hydrogen attack will most often be associated with the formation of surface blisters.
- B. 300 series stainless steels are also susceptible to high-temperature hydrogen attack at conditions normally seen in refinery units.
- C. High-temperature hydrogen attack damage is most often limited to welds and heat-affected zones.
- D. Acoustic emission testing is not a proven method for the detection of high-temperature hydrogen attack damage.
Correct Answer: D 🗳️
Explanation: Only visible for ActualCollection members. You can sign-up / login (it's free).
Aggressive ammonium chloride corrosion often occurs:
- A. When the salts precipitate from high-temperature streams as they cool.
- B. In the absence of a free water phase.
- C. When dry salts are exposed to a small amount of free water.
- D. When excess water washing dissolves too much ammonium chloride.
Correct Answer: C 🗳️
Explanation: Only visible for ActualCollection members. You can sign-up / login (it's free).






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