In 2026, the smartest preparation follows the official syllabus rather than guessing at it. Real4Prep plans every round of the API Corrosion and Materials Professional question bank against the exam objectives, giving you 151 practice questions with deliberate coverage.
API API-571 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Damage Mechanisms | - High-Temperature Hydrogen Attack (HTHA)
|
API-571 Study Material: Answers
The API Corrosion and Materials Professional exam requires a score of Minimum passing score determined by API using the modified Angoff method (typically around 70%) to pass, and the official registration fee is $900 USD (exam fee through API). Knowing these numbers in advance keeps your planning honest.
Each round of the API-571 question bank starts from the official exam objectives: experts map the syllabus, draft questions to cover it with precision, and review the result before release. When new exam points appear, the bank is updated accordingly — deliberate coverage, not guesswork.
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The API Corrosion and Materials Professional exam contains 100 questions, and you will have 3.5 hours (210 minutes) minutes to complete them. Practicing under the same constraints makes exam-day pacing feel rehearsed.
Candidates must hold a current API 510, 570, or 653 certification to automatically qualify. Otherwise, qualification is based on education and a minimum of 1-5 years of experience in the petrochemical industry acquired within the last 10 years.
You can confirm the current eligibility requirements on the official API-571 exam page before you register.
This package includes 151 practice questions for the API Corrosion and Materials Professional exam. Every answer is verified by an experienced team of experts, so you can trust what you study.
The API Corrosion and Materials Professional practice questions are organized around the official exam objectives. Key topics include:
- Damage Mechanisms ()
Syllabus-driven coverage means no wasted practice on irrelevant material.
API Corrosion and Materials Professional Sample Questions:
Which of the following is most susceptible to chloride stress corrosion cracking?
- A. Non-postweld heat-treated carbon steel
- B. Non-stress-relieved 304 stainless steel
- C. Non-stress-relieved admiralty brass U-bends
- D. Inadequately heat-treated 1.25 Cr-0.5 Mo low-alloy steel
Correct Answer: B 🗳️
Explanation: Only visible for Real4Prep 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%
Correct Answer: B 🗳️
Explanation: Only visible for Real4Prep members. You can sign-up / login (it's free).
300 series austenitic stainless steels susceptible to polythionic acid stress corrosion cracking (PTA SCC) can become sensitized when heated in the range of:
- A. 1200°F to 1650°F (622°C to 900°C)
- B. 1650°F to 1725°F (899°C to 941°C)
- C. 750°F to 1500°F (400°C to 815°C)
- D. 400°F to 675°F (204°C to 357°C)
Correct Answer: C 🗳️
Explanation: Only visible for Real4Prep members. You can sign-up / login (it's free).
Which of the following is the lowest threshold temperature at which creep damage is a concern in carbon steel with tensile strength > 60ksi (414 MPa)?
- A. 800°F (427°C)
- B. 700°F (371°C)
- C. 900°F (482°C)
- D. 600°F (316°C)
Correct Answer: B 🗳️
Explanation: Only visible for Real4Prep members. You can sign-up / login (it's free).
Sulfidation of iron-based alloys usually:
- A. Occurs at metal temperatures above 500°F (260°C)
- B. Occurs in equipment handling sour water
- C. Occurs only when moisture contacts the surface scale
- D. Causes wet hydrogen sulfide cracking of hard welds
Correct Answer: A 🗳️
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