Research and Technology Group
Technical Services Typically Asked Questions and Answers |
Aqueous Corrosion Question: My company is a leading manufacturer of pharmaceuticals. At this moment we are in the process of producing a new drug that involves the washing of the final product in 15% hydrochloric acid (HCl) solution at 175F (79C). My company has already two different reactors that we would like to use, one of the reactors is made of HASTELLOY B-2 alloy and the other of C-22 alloy. Is it possible for us to use any one of these reactors? 000 Answer: Yes, for the reducing acidic conditions mentioned above, the recommended alloy would be HASTELLOY B-2 or B-3 alloys. It is expected that the corrosion rate of these alloys would be below 10 mpy (0.25 mm/year). On the other hand, in the same conditions, C-22 alloy may experience corrosion rates in the order of 75 mpy (1.9 mm/year). |
High Temperature Question: I have an application for a high temperature alloy where the operating temperature is usually 1800°F. Does HAYNES International make an alloy that would perform satisfactorily in this environment? Answer: Yes, we probably do, however, because certain alloys were designed for use in specific types of environments and the criteria for adequate performance in one environment is typically unique to that environment, we need to know more about your application in order to suggest the best alloy. For example, the 230® alloy is one of the best alloys for use in high temperature oxidizing environments, however this does not mean that it will perform satisfactorily in a reducing sulfidizing atmosphere. In fact, the opposite is true. Therefore, information related to the following questions will allow us to make an appropriate alloy recommendation. First, what is the process where this material will be used? If it involves the conversion of a feedstock to an end-product, what is the feedstock you are using? What is the end-product? What are the impurities (e.g. Cl, S, Na, Pb, etc.) in your feedstock? Do you know the concentration of the impurities in your feedstock? If you are using an external fuel to heat this process, what type of fuel are you using (e.g. fuel oil, natural gas, coal, etc.)? What is the feedstock for your process? Are the temperatures you gave the actual metal temperatures or the temperature of a gas stream, the feedstock, etc.? In summary, the more detail you can give on your process, the better the alloy recommendation we can provide. |
Fabrication Question: Our company has received a contract to manufacture a pressure vessel made out of "HASTELLOY". What filler metal should I use? Answer: This is really a two part question, first, "HASTELLOY®" is a trademark for a family of high performance nickel-base alloys produced only by Haynes International. You must first be specific about which alloy, within that family of alloys, you are dealing with. Those alloys might include C-276, C-4, C-22®, C-2000®, G-3, G-30®, B-2, B-3® or X. Once the precise alloy has been identified, then a welding filler metal can be selected. As a general statement, there are matching filler materials for each of the base materials manufactured by Haynes Intenational. The matching filler material is always the first choice, when welding any of the HASTELLOY family of alloys. Many of the filler metals have American Welding Society designations and can be ordered to the particular AWS classification. If you are unsure about the AWS classification, the alloy can be ordered from Haynes Interntional using the base metal alloy name. |
