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[General] New New API-571 Test Braindumps | High-quality API-571 Official Cert Guide: Corr

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【General】 New New API-571 Test Braindumps | High-quality API-571 Official Cert Guide: Corr

Posted at yesterday 09:35      View：12 | Replies：0        Print      Only Author   [Copy Link] 1#
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API Corrosion and Materials Professional Sample Questions (Q29-Q34):NEW QUESTION # 29
Which of the following generally manifests itself as a subsurface damage mechanism?
  • A. Amine Stress Corrosion Cracking
  • B. Caustic Cracking
  • C. Stress-Oriented Hydrogen-Induced Cracking (SOHIC)
  • D. Sulfide Stress Corrosion Cracking (SCC)
Answer: C
Explanation:
As defined in API RP 571, under Hydrogen Blistering and HIC/SOHIC:
"SOHIC typically manifests as subsurface stepwise cracking, generally oriented perpendicular to the direction of stress."
"This mechanism initiates below the surface, typically in weld heat-affected zones, and requires metallographic or advanced ultrasonic methods to detect." By contrast, SSC, caustic cracking, and amine SCC are primarily surface-initiated, stress-related cracking mechanisms.
Thus, SOHIC is the subsurface mechanism in this list, making option D correct.

NEW QUESTION # 30
Weld heat affected zone graphitization is most frequently found in the heat affected zone adjacent to welds in a narrow band, corresponding to the low temperature edge of the heat affected zone. In multi-pass welded butt joints, these zones overlap each other covering the entire cross section. Because of its appearance, this type of graphitization is called________.
  • A. Radii
  • B. None of the above
  • C. Eyebrow
  • D. Half-moon
Answer: C

NEW QUESTION # 31
Temper embrittlement is a metallurgical change that is:
  • A. Not readily apparent but can be confirmed through tension testing
  • B. Readily apparent and can be confirmed through metallography
  • C. Not readily apparent but can be confirmed through impact testing
  • D. Readily apparent and can be confirmed through impact testing
Answer: C
Explanation:
API RP 571 describes temper embrittlement as a subtle metallurgical change that reduces impact toughness without obvious macrostructural change:
"Temper embrittlement is not readily apparent by visual or standard tensile testing. It is confirmed by Charpy impact testing which measures toughness at low temperatures."
"It typically affects Cr-Mo steels exposed to intermediate temperatures (650°F to 1100°F) for extended times." (Reference: API RP 571, Section 4.2.1.4 - Temper Embrittlement) Thus, the condition is not visually or physically apparent, but is confirmed through impact testing, making option D correct.

NEW QUESTION # 32
Oxidation of carbon steel begins to become significant above _________.
  • A. 800(o) F
  • B. 1000(o) F
  • C. 1100(o) F
  • D. 900(o) F
Answer: B

NEW QUESTION # 33
Which of the following is a critical factor for chloride stress corrosion cracking?
  • A. Presence of oxygen
  • B. Use in an alkaline pH region
  • C. Presence of nickel content less than 8%
  • D. Presence of nickel content higher than 35%
Answer: A
Explanation:
According to API RP 571, in the section on "Chloride Stress Corrosion Cracking (Cl-SCC)", several critical factors are outlined that contribute to the initiation and propagation of this mechanism. The document states:
"Critical factors include the presence of chlorides (even at ppm levels), oxygen, elevated temperatures, tensile stress, and susceptible materials such as austenitic stainless steels and some nickel alloys."
"Oxygen is an accelerant and promotes pitting that can lead to SCC initiation." (Reference: API RP 571, 3rd Edition, Section 4.2.2.2) Therefore, the presence of oxygen is a well-documented critical factor in Cl-SCC. It acts in conjunction with chlorides to initiate localized pitting, which then progresses into cracking. Hence, option B is the correct choice.

NEW QUESTION # 34
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