2205 c276,904l,xm-17,f55,f44,2507,2202,254smo,dc53,4cr13h,skd11

 　　Today we will talk about the brand of Hastelloy C alloy of nickel chromium molybdenum alloy, which has as much content as Hastelloy B alloy.

　　When it comes to Hastelloy C alloy, let me first talk about the relevant knowledge of nickel chromium molybdenum alloy (nickel chromium, nickel molybdenum). Ni-Cr corrosion-resistant alloys have good corrosion resistance in oxidizing media. Taking into account the advantages of nickel molybdenum and nickel chromium binary corrosion-resistant alloys, the developed Ni-Cr-Mo corrosion-resistant alloys have excellent corrosion resistance when they contain a large amount of chromium, molybdenum, and other elements at the same time, mainly manifested in good corrosion resistance not only in some oxidizing media, but also in some reducing media, especially in the presence of F In the oxidizing acid of Cl plasma, in the reducing acid in the presence of oxygen or oxidants, in the mixed acid of oxidizing acid and reducing acid, and in the aqueous solution of wet chlorine and chlorine gas, all have unique corrosion resistance properties that cannot be compared to other corrosion resistant alloys.

　　The corrosion resistance of nickel chromium and nickel molybdenum alloys in oxidizing media is still very strong, so let's talk about Hastelloy C alloy!

　　This alloy is the first Ni Cr Mo type corrosion-resistant alloy in the Hastelloy C series introduced in the 1930s.

　　What are the structural characteristics of Hastelloy C alloy?

　　This alloy is mainly resistant to corrosion by wet chlorine, various oxide chlorides, chloride salt solutions, mixtures of sulfuric acid and oxidizing salts, sulfite, various concentrations of organic acids at boiling temperature, as well as pitting corrosion by chlorides and seawater.

　　What is the corrosion resistance of Hastelloy C alloy?

　　In seawater, Hastelloy C alloy was immersed in seawater, and after 10 years of inspection, its corrosion rate was ≤ 0.025mm/a, and no pitting corrosion occurred.

　　In sulfuric acid, Hastelloy C alloy exhibits good corrosion resistance in various concentrations of H2SO4 at room temperature, and the addition of air has no effect on its corrosion resistance.

　　In hydrochloric acid, although Hastelloy C alloy has lower resistance to hydrochloric acid corrosion than nickel molybdenum alloy, the corrosion rate is not higher than 0.1mm/a in various concentrations of room temperature hydrochloric acid; In hydrochloric acid at 65 ℃, the corrosion rate is also ≤ 0.5mm/a; When air is filled into hydrochloric acid, the corrosion resistance only slightly decreases in hydrochloric acid above room temperature. The sensitivity of this alloy to oxygen is much lower than that of nickel molybdenum alloy. When there are oxidizing salts such as FeCl Å and CaCl ₂ in the acid, the overall corrosion resistance of this alloy slightly decreases.

　　In hydrofluoric acid, the corrosion resistance of Hastelloy C alloy decreases with increasing temperature in HF acid. The constant boiling point concentration of HF acid is about 36%, and the boiling point is 112 ℃. Higher concentrations of HF acid can only be obtained by dissolving anhydrous HF in water.

　　There is a lot of content on the corrosion resistance of Hastelloy C alloy. What other media are there?

　　Yes, there was a lot of content mentioned at the beginning. Today, I will tell you a part. In phosphoric acid, the corrosiveness of phosphoric acid is closely related to the production method of phosphoric acid. Generally, wet process phosphoric acid has greater corrosiveness than ordinary phosphoric acid. This is because wet process phosphoric acid contains free F ł, Cl ł ions and SO4 ² ¯。 Hastelloy C alloy exhibits excellent corrosion resistance in wet process phosphoric acid.

　　In sulfite, the oxidizability of sulfite is higher than that of H2SO4. Therefore, Hastelloy C alloy with Cr ≥ 15% is corrosion resistant in this medium at any concentration and temperature.

　　In nitric acid, although Hastelloy C alloy can withstand all concentrations of HNO Å at room temperature or low concentrations of HNO Å at higher temperatures, many stainless steels are resistant to the corrosion of this acid and are much cheaper than Hastelloy C alloy. Therefore, Hastelloy C alloy is generally not used in HNO Å resistant materials. I have to go to work now. Let's talk about the rest tomorrow.

　　Today we will talk about the brand of Hastelloy C alloy of nickel chromium molybdenum alloy, which has as much content as Hastelloy B alloy.

　　When it comes to Hastelloy C alloy, let me first talk about the relevant knowledge of nickel chromium molybdenum alloy (nickel chromium, nickel molybdenum). Ni-Cr corrosion-resistant alloys have good corrosion resistance in oxidizing media. Taking into account the advantages of nickel molybdenum and nickel chromium binary corrosion-resistant alloys, the developed Ni-Cr-Mo corrosion-resistant alloys have excellent corrosion resistance when they contain a large amount of chromium, molybdenum, and other elements at the same time, mainly manifested in good corrosion resistance not only in some oxidizing media, but also in some reducing media, especially in the presence of F In the oxidizing acid of Cl plasma, in the reducing acid in the presence of oxygen or oxidants, in the mixed acid of oxidizing acid and reducing acid, and in the aqueous solution of wet chlorine and chlorine gas, all have unique corrosion resistance properties that cannot be compared to other corrosion resistant alloys.

　　The corrosion resistance of nickel chromium and nickel molybdenum alloys in oxidizing media is still very strong, so let's talk about Hastelloy C alloy!

　　This alloy is the first Ni Cr Mo type corrosion-resistant alloy in the Hastelloy C series introduced in the 1930s.

　　What are the structural characteristics of Hastelloy C alloy?

　　This alloy is mainly resistant to corrosion by wet chlorine, various oxide chlorides, chloride salt solutions, mixtures of sulfuric acid and oxidizing salts, sulfite, various concentrations of organic acids at boiling temperature, as well as pitting corrosion by chlorides and seawater.

　　What is the corrosion resistance of Hastelloy C alloy?

　　In seawater, Hastelloy C alloy was immersed in seawater, and after 10 years of inspection, its corrosion rate was ≤ 0.025mm/a, and no pitting corrosion occurred.

　　In sulfuric acid, Hastelloy C alloy exhibits good corrosion resistance in various concentrations of H2SO4 at room temperature, and the addition of air has no effect on its corrosion resistance.

　　In hydrochloric acid, although Hastelloy C alloy has lower resistance to hydrochloric acid corrosion than nickel molybdenum alloy, the corrosion rate is not higher than 0.1mm/a in various concentrations of room temperature hydrochloric acid; In hydrochloric acid at 65 ℃, the corrosion rate is also ≤ 0.5mm/a; When air is filled into hydrochloric acid, the corrosion resistance only slightly decreases in hydrochloric acid above room temperature. The sensitivity of this alloy to oxygen is much lower than that of nickel molybdenum alloy. When there are oxidizing salts such as FeCl Å and CaCl ₂ in the acid, the overall corrosion resistance of this alloy slightly decreases.

　　In hydrofluoric acid, the corrosion resistance of Hastelloy C alloy decreases with increasing temperature in HF acid. The constant boiling point concentration of HF acid is about 36%, and the boiling point is 112 ℃. Higher concentrations of HF acid can only be obtained by dissolving anhydrous HF in water.

　　There is a lot of content on the corrosion resistance of Hastelloy C alloy. What other media are there?

　　Yes, there was a lot of content mentioned at the beginning. Today, I will tell you a part. In phosphoric acid, the corrosiveness of phosphoric acid is closely related to the production method of phosphoric acid. Generally, wet process phosphoric acid has greater corrosiveness than ordinary phosphoric acid. This is because wet process phosphoric acid contains free F ł, Cl ł ions and SO4 ² ¯。 Hastelloy C alloy exhibits excellent corrosion resistance in wet process phosphoric acid.

　　In sulfite, the oxidizability of sulfite is higher than that of H2SO4. Therefore, Hastelloy C alloy with Cr ≥ 15% is corrosion resistant in this medium at any concentration and temperature.

　　In nitric acid, although Hastelloy C alloy can withstand all concentrations of HNO Å at room temperature or low concentrations of HNO Å at higher temperatures, many stainless steels are resistant to the corrosion of this acid and are much cheaper than Hastelloy C alloy. Therefore, Hastelloy C alloy is generally not used in HNO Å resistant materials. I have to go to work now. Let's talk about the rest tomorrow.