【Daily Question】 【AC Version for Static Equipment...Question 25】 January 25, 2019 – True/False Question...Wish you good luck

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bg4.png【Daily Question】 【AC Version for Static Equipment...Question 25】 January 25, 2019 True/False multiple-choice question...Wish you good luck. Please fill in the answers (multiple choice, single choice, single choice) in order. Reward rules: 1 wealth for participation, 3 wealth for each correct answer, up to a maximum of 10 wealth. This topic is valid for two days; no score will be given if it exceeds two days by 48 hours. You understand all these requirements; I needn’t go into detail about the many detours involved, hehe—valuable contribution of information. https://bbs.hcbbs.com/thread-2268245-1-1.html --------------------- Voting is underway for the final candidates for Haichuan’s 2018 “Top Ten Outstanding Members”... https://bbs.hcbbs.com/thread-2273209-1-1.html---------------------1. For pressure vessels with a design temperature of 600°C, the possible steel grades for their shells are (). A. 06Cr19Ni10(S30408) ； B. 06Cr17Ni12Mo2(S31608) ； C. 022Cr17Ni12Mo2(S31603) ； ---------------------2. For pressure vessels designed for a temperature of -50°C, the allowable steel grade for the vessel shell is (). A. 16MnDRB. 15MnNiDRC. 09MnNiDR ---------------------3. When the radius of curvature of the bellows waves is doubled, the radial bending stress caused by internal pressure is reduced by about two times, but there is no significant effect on the circumferential stress. ( ) A. Correct B. Incorrect --------------------- Answers: 1. A B 2. C 3. A 1. Comment: For austenitic stainless steels, when the temperature exceeds 525°C, the carbon content must be at least 0.04%; ultra-low carbon stainless steels cannot be used in such situations. This question is designed to test this concept; refer to Table 13 in the new stainless steel standard GB/T24511-2017. 2. Comments: As can be seen, these materials are the most commonly used low-temperature materials for pressure vessels, and their appropriate application ranges should be firmly remembered. It is not required to memorize all the technical parameters of all the materials. 3. Comments: Basic concepts of bellows. When calculating bellows, understanding the impact of parameters on stress facilitates parameter adjustment and selection.