- Exam Code: API-571
- Exam Name: Corrosion and Materials Professional
- Updated: Sep 08, 2026
- Q & A: 151 Questions and Answers
The API Corrosion and Materials Professional has a reputation for tripping up even experienced professionals. Actual4Dumps built its API-571 practice questions for 2026 to mirror that difficulty, so nothing on exam day catches you off guard.
| 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 |
| Exam Format: | Closed-book exam, Multiple-choice questions, Computer-based test |
| Real Exam Qty: | 110 (100 scored, 10 unscored pretest) |
| Related Certifications: | API 510 Pressure Vessel Inspector API 570 Piping Inspector API 653 Aboveground Storage Tank Inspector |
| Exam Price: | $440 USD |
| Exam Duration: | 195 minutes |
| Certificate Validity Period: | 3 years |
| Available Languages: | English |
| Recommended Training: | API RP 571 Damage Mechanisms Standard |
| Exam Registration: | API ICP Portal Prometric Scheduling |
| 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 |
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Environmentally Assisted Cracking | 25% | - Hydrogen Embrittlement - Chloride Stress Corrosion Cracking - Caustic Stress Corrosion Cracking - Sulfide Stress Cracking |
| Topic 2: Mechanical and Metallurgical Failure Mechanisms | 15% | - Creep and Stress Rupture - Brittle Fracture - Mechanical Fatigue - Thermal Fatigue |
| Topic 3: Uniform or Localized Loss of Thickness | 25% | - Ammonium Bisulfide Corrosion - Hydrochloric Acid Corrosion - Oxidation and Scaling - Corrosion Under Insulation (CUI) - Sulfidation |
| Topic 4: Terms, Definitions, and Acronyms | 5% | |
| Topic 5: High-Temperature Corrosion and Degradation | 15% | - Carburization - Decarburization - Graphitization - Metal Dusting |
| Topic 6: Other Damage Mechanisms | 15% | - Microbiologically Influenced Corrosion - Cavitation Damage - Erosion and Erosion-Corrosion - Liquid Metal Embrittlement |
The API Corrosion and Materials Professional is the official API exam that leads to the Corrosion and Materials Professional certification at the Professional level. Passing it validates your skills against API standards and proves your qualification to current and future employers. The credential is also connected with related certifications such as API 510 Pressure Vessel Inspector, API 570 Piping Inspector, API 653 Aboveground Storage Tank Inspector, so it can serve as a solid step in a broader certification path.
The API-571 exam has 110 (100 scored, 10 unscored pretest) questions in total and must be completed within 195 minutes. That leaves only a narrow time budget per item, so train yourself to flag a difficult question, move on, and circle back later instead of getting stuck. A week or two before your test date, run at least one full timed mock exam in the Actual4Dumps desktop or online test engine under the same 195 minutes limit, and repeat until you can finish with a few minutes left for review.
The passing score for the API-571 exam is 70% / Scaled score determined by API, and the official registration fee is $440 USD. Keep in mind that a failed attempt is not discounted — retaking the exam means paying the full fee again — so it is wise not to book your seat until your practice scores sit comfortably above the passing mark. Working through the 151 questions at Actual4Dumps in timed mode is a reliable way to judge when you are truly ready.
API sets the following requirement for the API-571 exam: 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 can change from time to time, so always confirm the current prerequisites on the official exam page at https://www.api.org/products-and-services/individual-certification-programs/certifications/api571 before you register.
You can register for the API Corrosion and Materials Professional through the following official channels:
The API-571 exam is delivered as Computer-based testing (CBT) at Prometric test centers; online proctored option available, so review the technical and check-in requirements for that format when you schedule your appointment.
API recommends the following official training options for the API Corrosion and Materials Professional:
Official courses build the theory, and pairing them with the 151 practice questions from Actual4Dumps turns that knowledge into exam-ready answers.
Yes. Actual4Dumps offers a free PDF demo for the API Corrosion and Materials Professional, so you can review real sample questions and judge the quality before paying anything. After your purchase, you receive 365 days of free updates — whenever the question pool changes, you get the latest version at no cost. Once that period expires, you can extend your update service at a 50% discount from your member zone.
If you take the API-571 exam within 60 days of your purchase and do not pass, you can apply for a full refund under our 100% Money Back Guarantee. To qualify, submit a scanned copy of your exam enrollment slip together with your official Score Report (PDF) within 2 days after the exam date, and your claim will be processed within 7 days. Note that the guarantee applies only to the corresponding exam: attempts taken within 3 days of purchase, downloaded-but-unused materials, free resources, and expired orders are not eligible, and the candidate name must match the purchaser name. If you would rather not refund, you can exchange the product for two free exam products of equal value while keeping the update service on your original purchase.
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The API Corrosion and Materials Professional is organized into 6 domains. Among the first ones are Mechanical and Metallurgical Failure Mechanisms (15%), Other Damage Mechanisms (15%), Uniform or Localized Loss of Thickness (25%), and the remaining domains cover the rest of the official objectives. For the complete topic breakdown with every subtopic, see the full API-571 exam outline above on this page.
At which of the following temperatures would the highest atmospheric corrosion rates be expected?
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(Refractory materials can suffer what forms of degradation in service?)
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(Which damage mechanism occurs primarily as a result of exposure of interior vessel surfaces to air and moisture conditions during shutdown?)
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The most effective mitigation for amine stress corrosion cracking is:
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To avoid cooling water scaling, process side inlet temperatures should be below:
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