One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； Question 319
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Fill-in-the-blank: In pressure pipelines, martensitic stainless steels are commonly used as the material for the stem and valve core of ( ) and ( ) valves; the two most common grades are 1Cr13 and 3Cr13. Answer: carbon steel, chromium-molybdenum steel
Ball valve,,,,, check the answer
In pressure pipelines, martensitic stainless steel is commonly used as the material for the valve stems and valve cores of (carbon steel) and (chromium-molybdenum steel) valves; the two most commonly used grades are 1Cr13 and 3Cr13
Ball valves and gate valves? I’m just participating out of interest; please don’t blame me if I get it wrong!
Carbon steel------Chromium-molybdenum steel------------------
Corrosion resistance and high temperature resistance. . . . . . . . . . . . . .
Carbon steel and chromium-molybdenum steel!!!!!!
In pressure pipelines, martensitic stainless steel is commonly used as the material for the valve stems and valve cores of (gate valves) and (ball valves); the two most common grades are 1Cr13 and 3Cr13.