The phosphorus content (as determined by melting analysis; the same applies hereafter) in steel dedicated for pressure vessels should not exceed 0.03%, and the sulfur content should not exceed 0.02%
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Here is a true or false question for everyone: The phosphorus content in steel specifically designed for pressure vessels (as determined by melting analysis; the same applies here) should not exceed 0.03%, and the sulfur content should not exceed 0.02%. Is this correct or incorrect? It often appears in past exam questions, thank you. I have doubts about the so-called standard answers
Why the doubt? Isn’t it listed in the fixed capacity specifications?
See TSG21-2016 2.2.1.2.2
Actually, that’s what I wanted to say too. Looking at the questions from previous years, whether they are judgmental, multiple-choice, or fill-in-the-blank types, the terms \"carbon steel\" and \"low-alloy steel\" are never mentioned. If I really encounter them in an exam, multiple-choice or fill-in-the-blank questions are fine, but for true/false questions, I hesitate to answer them.
The question is not precise; the key point lies in determining whether carbon steel or low-alloy steel is involved. After all, the P content in stainless steel is always greater than 0.03%. Therefore, when faced with such a question, it should be clearly marked as incorrect