Metallurgy/Questions Answered by Expert Alexandre Guimarães Botelho
| Subject | Date Asked |
| ASTM standards-latest version | 4/29/2009 |
| Q: Can you please provide some information about latest versions of the following ASTM standards ... A: Unfortunately I have no experience with this structural steel, specially under brittish standards ... | |
| metallurgy | 3/1/2009 |
| Q: I have an antique piece of 'silverware'assayed a long time ago as being 85% silver 15% lead. Does ... A: I have done a little research on my material and in some specialized sites and could not find any ... | |
| Commonly used Metals | 1/11/2009 |
| Q: I'm doing a science project and I need to know which metals are most commonly used in construction. ... A: That will depend on the segment. For oil&gas, we use mostly low and medium carbon steel, and ... | |
| metallurgy | 1/8/2009 |
| Q: what is or what characterize the thermodynamic state of metal (structure of metal)? Thank You, Janez A: In the solid state, metals have a cristalline structure made of metal atoms which are drawn together ... | |
| Heat Treatment | 1/5/2009 |
| Q: When we do cardonitriding or casehardening operation for a plain carbon steel the casedepth,hardenss ... A: Usually that will depend on the time and temperature, as well as chemical composition of the furnace ... | |
| steel cabling | 7/22/2008 |
| Q: I am trying to find out how a blacksmith circa the year 1200AD would be able to make steel cables, ... A: Dan, I don't think it was possible due to steel not being mass produced at that time. The cost ... | |
| Stainless steel corrosion in sulfuric acid | 7/8/2008 |
| Q: I work with sintering of metal powders and I have been trying to find an additive alloy powder for ... A: I am still far from being a doctor, but thanks, anyway. For H2SO4 corrosion resistance at 80C it is ... | |
| Railroad Footeres | 7/8/2008 |
| Q: .. I'm interested in knowing what type of metal railroad footers are made of; and if I can cook on ... A: I have been done some research on railroad steel slabs, since it is not my field of expertise. ... | |
| Copper fasteners | 7/2/2008 |
| Q: Is there any specific benefit to using copper or bronze fasteners as opposed to the more commonly ... A: I need more information to answer this question. Are these fasteners to be used in some special ... | |
| Corrosion on 316 ss cables | 7/1/2008 |
| Q: I recently erected a balistrade near the sea using grade 316 stainless steel cables. Within a few ... A: Although SS 316 is one of the best common stailess steels for corrosion resistance, it still suffers ... | |
| metallurgy | 6/27/2008 |
| Q: what is carbida? ANSWER: Hello, I did not find anything about carbida, except for the information ... A: The epsilon carbide is a transition carbide of between Fe2C and Fe3C composition, with hexagonal ... | |
| Corrosion resistance | 5/22/2008 |
| Q: I have a customer who wants to place a unit we manufacture in an atmosphere containing 35% hydrogen ... A: In fact there won't be any residue. What will happen is that the hydrogen peroxide decomposes into ... | |
| marbelizing copper | 5/22/2008 |
| Q: Last year we built a house and used 1/8” thick copper inserts with a cut-out design in our stair ... A: I have pondered a while over this situation but could not find a procedure to help you. You guessed ... | |
| White rust on galvanized sheets | 5/16/2008 |
| Q: We recently unloaded a large/heavy order of galvanized sheets during a driving rain and water got ... A: Leonard, I am sorry for the lateness of this response. I was away and did not set my status as ... | |
| Corrosion resistance | 5/15/2008 |
| Q: I have a customer who wants to place a unit we manufacture in an atmosphere containing 35% hydrogen ... A: Easley, I am very sorry for the lateness of the response, but I was travelling in the period and ... | |
| Chemical effects on sintered steel | 5/2/2008 |
| Q: We use an electroplating process on several kinds of steel bearing liners that adds a layer of ... A: That will depend on the time, temperature and composition of the chemicals used, as well as on the ... | |
| melting lead | 4/30/2008 |
| Q: i am casting lead bullets for military surplas rifles. is there any substance that i can add to the ... A: Good morning, Bill, I have never heard of coloured bullets before, so i was pondering on the ... | |
| Brass | 4/29/2008 |
| Q: what are the compositions of brass, how can this metal be heat treated, what is the melting point of ... A: Good afternoon, There it goes: Melting temperature is around 930-950ºC (1706-1742 F), due to ... | |
| grinding of 316L SST | 4/26/2008 |
| Q: i was wondering if you could tell me about surfacing grinding 316L SST. I run a Kent Surface ... A: Mike, Since austenitic stainless steels area usually more resilient than ferritic ones, you may ... | |
| Corrosion | 4/25/2008 |
| Q: Corrosion resistance I am looking for material with corrosion resistance against HF(g) and HCl(g) ... A: Tomas, This is a very tough question! There are many variables playing important roles in the ... | |
| Brass | 4/24/2008 |
| Q: what are the compositions of brass, how can this metal be heat treated, what is the melting point of ... A: Brass is an alloy of copper and zinc, with varying degrees of mixing. It is a substitutional alloy, ... | |
| Normalising temperature | 4/23/2008 |
| Q: My question is regarding the normalising temperature & soaking time for the materials. How do you ... A: Sorry for the lateness in the response, I have studied with an excellent russian book translated to ... | |
| Lincoln A/C 225 | 4/19/2008 |
| Q: Is it better to leave welder on all the time, while preparing another part, or constantly turn it ... A: Good evening, Bob, This question is, in fact, a life cycle cost question, and the answer varies ... | |
| Normalising temperature | 4/18/2008 |
| Q: My question is regarding the normalising temperature & soaking time for the materials. How do you ... A: Good morning Ajay, Normalization is a special annealing process intended to reduce the effects ... | |
Alexandre Guimarães Botelho
Top Expert on this page
Expertise
General questions about metallurgy. Metals, fabrication processes, physical metallurgy, chemical composition and physical properties. As my area of expertise is corrosion, fracture and extractive metallurgy, I may not respond quickly to more in-depth questions outside those fields.
Experience
Up to the moment (2008) I have five years of experience in maintenance and inspection of industrial equipment, integrity assessment, reliability and failure analysis. I also have previous experience in iron mine processing unit and pelletizing process units.
Organizations
PETROBRAS-Brazilian energy enterprise
Publications
9th COTEQ - Conferência sobre tecnologia de Equipamentos, 6 SIC - Simpósio Internacional de Confiabilidade, 2nd CIM - Seminário de Confiabilidade, Inspeção e Manutenção da PETROBRAS.
Education/Credentials
I have technical degree in mechanics and graduation as a Metallurgical Engineer. I am also specialized in industrial equipment, maintenance and inspection, and currently specializing in Quality Engineering and Reliability Engineering.
©2012 About.com, a part of The New York Times Company. All rights reserved.