What materials can meet the requirements?
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The outer wall temperature reaches a maximum of 700°C, and the design pressure is 35Mpa. It is initially planned to use INconel 625 high-temperature alloy steel, which is widely used internationally. However, after research, the price of this alloy steel is between 400,000 and 500,000/ton. Therefore, we now hope to find relatively cheap alloy steel with similar high-temperature strength. I wonder if there is any domestic alloy steel that can meet the requirements.
Corrosion resistance of industrial pure titanium in various media TOP Medium concentration (mass fraction) (%) Temperature/℃ Corrosion rate/mm/a (year) Corrosion resistance grade inorganic hydrochloric acid 1 Room temperature/boiling 0.000/0.345 Excellent/good 5 Room temperature/boiling 0.000/6.530 Excellent/poor 10 Room temperature/boiling 0.175/40.87 Good/poor 20 Room temperature/— 1.340/— Poor/— 35 Room temperature/— 6.660/— Poor/— Sulfuric acid 5 Room temperature/boiling 0.000/13.01 Good/Poor 10 Room temperature/— 0.230/— Good/— 60 Room temperature/— 0.277/— Good/— Poor 80 Room temperature/— 32.660/— Poor/— 95 Room temperature/— 1.400/- poor/- nitric acid 37 room temperature/boiling 0.000/
• Ni-Cr alloys often contain some iron • Inconel alloys with lower iron content, • Incoloy alloys with higher iron content. • The Cr content is similar to that of stainless steel, • The Ni content is much higher than that of stainless steel, • Therefore, it has better resistance to alkali corrosion and high temperature corrosion. 800℃~1000℃, and the use temperature of nickel-based alloy is 600℃~800℃, then austenitic steel can be used.
How about stainless steel heat-resistant steel, such as 310S. But your pressure is so high and the temperature is so high, it’s really troublesome