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  • Users: CdotS
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  1. CdotS

    Bolt head marking

    I have received a couple of bolts with a rather unique markings for failure analysis. It has two lines on its head. There is no such markings in the standards. I attach a photo of one of the bolts. If you know any info on this bolt, please let me know. Thanks.
  2. CdotS

    Why does steel plate move during flame cutting?

    We use flame cutting on low alloy steel plates to make 6 to 12 inch wide strips. The plate moves around 0.5 inch and therefore the strips are not parallel. Did any one experience this type of movement? Any comments on how to stop this movement?
  3. CdotS

    Induction versus gas fired furnace heat treatment

    Does any one have any insight into the steel microstructure (say low carbon low alloy type) that forms after quenching and tempering in a induction heat treatment line as compared to a gas fired furnace system? I am specifically interested in the influence of soaking time (more in gas fired...
  4. CdotS

    Low alloy steel cracking after HT

    How do I differentiate fracture surfaces of low alloy steel plates (15B30) that failed after heat treatment to achieve 48HRC (austenitize at 1550F, water quench, temper at 850F,& straighten in a press to remove distortion, water quench to room temperature)? In others, how do I know whether the...
  5. CdotS

    Spark spectrometer selection

    I am in the process of selecting a spark spectrometer for analyzing various kinds of steel products ranging from carbon steel to low alloy steel with boron. Based on your experience, any comments on various spectrometers available in terms of performance (accuracy, speed,range of elements)...
  6. CdotS

    Energy consumption in steel heat treatment

    Is there any reference available to compare energy consumption in the austenitizing and tempering treatment of steel (Q+T) plates? I am interested in comparing the energy efficiency of my gas fired furnaces to other gas furnaces used for similar purposes. I have searched the Internet and found...
  7. CdotS

    Steel hardenability Calculator

    I am trying to predict hardenability of different steels using 3 formulas published in ASM Handbook Vol 4: Heat Treating - page 28. They predict steel hardness at different depths of the Jominy specimen from its chemical composition. Is there any better way of predicting hardenability of steel?
  8. CdotS

    Steel melting - Arc vs Induction

    Can any one throw some light on the main differences in properties of steel castings made from an arc furnace compared to the castings from an induction furnace?
  9. CdotS

    Books for Basic Materisls Eng. Course

    Any recommendations on the books for basic materials engineeirng course? I would like to consider DVD/Video to supplement the book/s. The audience will be manufacturing staff in a medium size, metal-based industry dealing with steels and other materials. Thanks.
  10. CdotS

    Laser drilling of square hole in countersinks

    I am trying to make square holes after drilling countersinks in a carbon steel plate. Plate thickness = 5/8 inch Counter sink hole depth = 0.310 inch Depth of laser drilling = 0.315 inch Hole size = 0.562 inch with corner radius of 0.125 inch The laser cutting company I have contacted says...
  11. CdotS

    Carbide size control in steels

    Can any one help me? I would like to control the size of iron carbide particles in 0.8% carbon steel. Can I adjust the austenitizing temperature and soaking time to control carbide size? Will the same technique be useful for low alloy steels where other carbides (e.g. chromium) also present.
  12. CdotS

    Why hard material wear when slid aginst soft one?

    When cotton fibre runs against steel, steel components wear out, e.g. steel or plastic components used in the textile industry. My question is " Why does a hard surface such as hardened steel wear when a soft material such as cotton fiber runs on it?" I think cotton fiber is not abrasive. It is...
  13. CdotS

    Minimum Cl for pitting of 316 stainless steel?

    What is the minimum chlorine or chloride ion content in ppm in solution to make 316 stainless steel to corrode (especially by pitting) at around 100degree C? Where can I get such information? Thanks in advance.
  14. CdotS

    MIC - Microbiologically induced corrosion

    This is realted to corroded samples taken from oil and gas pipelines. It was reported that they corroded due to MIC -microbiologically induced corrosion. My question to the experts are as follows: 1. How can I determine from the surface features the mechanism of corrosion? I can get...
  15. CdotS

    How to remove copper from carbon steel substrate?

    What is the best solution (acid or otherwise) to remove copper deposits a mild steel without affecting the substrate underneath?
  16. CdotS

    Oxidizing or reducing atmosphere?

    I have come across many papers which talk about Material A is good for oxidizing situations whereas Materila B is good for reducing atmospheres. What is the simplest method to identify/catagorize a corrosive environment - either oxidizing or reducing? Is it based on what happens to the metal...
  17. CdotS

    ASTM 28B Corrosion Testing

    I am currently testsing some nickel alloy samples in ASTM 28B (H2SO4, HCl, CuCl2, FeCl3)solution. After one test it turned dark green. I kept using the same solution to see whether it has still corrosivity to corrode samples. I have done 3 tests but still it seems to give some results. The...

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