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  1. kenvlach

    4140 processing

    Go to http://www.matweb.com and search for 4140 steel. 32 results. Note the wide range of tempering temperatures. A lower tempering T will give greater strength but less ductility (elongation at break). Click on any listing to see the properties and specifications (ASTM, BS (UK), DIN, JIS, SAE...
  2. kenvlach

    Silver Plate Corrosion

    This seems to be an environment requiring precious metal plating, e.g., hard gold, platinum, rhodium or an alloy thereof (Ir,Pt, Rh). An intermediate layer of nickel may be needed as a diffusion barrier (between copper & gold).
  3. kenvlach

    Electroless Nickel Plating or Coating?

    You can also get the superseded standard, MIL-C-26074E COATINGS, ELECTROLESS NICKEL REQUIREMENTS FOR "This specification covers the requirements for electroless (autocatalytic chemical reduction) deposition of nickel-phosphorous alloy coatings on metal and composite surfaces." (still used by...
  4. kenvlach

    Appleby's Illustrated Handbook of Machinery (ca. 1901) available,free!

    Google Books has available online Appleby's Illustrated Handbook of Machinery published 1897-1903. The 5 (6?) volumes available are I. Prime Movers (1897, 1901 & 1903 editions available), http://books.google.com/books?as_brr=1&q=Appleby%27s+Illustrated+Handbook+Prime+Movers&btnG=Search+Books...
  5. kenvlach

    Cold Spray Aluminimum - experiences? Answer to CUI?

    robsalv, I figured you knew the difference, but others might not. Note Intertherm qualifies the term with apostrophes: 'cold spray' applied coating. Some other, under insulation paints with similar corrosion and heat resistance: http://alvinproducts.com/Dampney/...
  6. kenvlach

    RoHS compliant plating queries - take two!

    (1), (2): Metallic chromium plating is RoHS-compliant (no Cr+6). (3), (4): Possible problems. A common black chrome formula [MIL-C-14538C & newer version MIL-DTL-14538D Chromium Plating, Black (Electrodeposited)] is considered to produce hex-Cr. I believe it may actually produces Cr+5 in the...
  7. kenvlach

    Cold Spray Aluminimum - experiences? Answer to CUI?

    Cold spray Aluminium (CSA) isn't paint. CSA is aluminum particles applied in a supersonic inert gas stream such that cold welding to the substrate occurs. A one-paragraph intro: http://www.sandia.gov/materials/sciences/factsheets/SprayCoating.html Mechanical and Microstructural Effects of...
  8. kenvlach

    PH and ORP Control Strategy for H2S Removal in a Packed Bed Scrubber

    As concentrated (50%) hydrogen peroxide is very acidic [pH of 1-3 per MSDS from FMC], try neutralizing the make-up solution. Although this will increase the volume of peroxide solution added, the amount of NaOH solution will ~proportionally decrease. Also, you'll get finer ORP control (e.g...
  9. kenvlach

    yield & allow. stress about chinese standard materials

    The composition is merely that; it says nothing about the processing.* For example, 30CrMo ~ AISI 4130. Properties vary depending upon annealed, normalized, quenched, quenched + tempered, cold worked, hot worked, etc. conditions. Depending upon application, an ASTM or ASME standard and grade...
  10. kenvlach

    SR319 properties ???

    The strontium isn't reinforcement but rather, a grain refiner. It gives a finer grained solidification microstructure. This gives some improvement in mechanical properties: http://www.meloon.com/design.phtml#Aluminum%20Alloys The finer microstructure, particularly the smaller silicon grain...
  11. kenvlach

    Questions about coatings via CVD Vacuum Chamber

    You probably want to stay away from CVD, which often involves streams of toxic expensive gases which (generally) thermally decompose upon the heated substrate part. TiN is most commonly deposited via reactive PVD; the titanium is evaporated or sputtered from a metal source in a vacuum...
  12. kenvlach

    airflow through sawdust to make it burn.

    From link given by 25362, some wood pellet-burning stoves are "exempt from 1988 NSPS due to an air-to-fuel ratio > 35:1." Makes a lot more sense than '35:1 fuel to air'
  13. kenvlach

    "celebrities" in engineering?

    The American general public probably doesn't know any engineers (Edison & Ford being inventors) except perhaps for the famous locomotive engineer Casy Jones: http://en.wikipedia.org/wiki/Casey_Jones
  14. kenvlach

    6061-T6 anodized fatigue issues

    For so few cycles, the effect of anodizing on fatigue is nearly irrelevant. For high cycle fatigue (106), hard anodizing greatly reduces the fatigue strength of 6061-T6: from 15,000 down to 6,000 psi. -- Materials and Methods, vol. 32, p. 62-64 (1950). Hard anodizing is usually only used where...
  15. kenvlach

    airflow through sawdust to make it burn.

    Re 'What is a 35:1 fuel to air mixture ratio mean?' Are the ratio units weight or volume? Dry wood is about C6H10O4 (atomic). The combustion reaction is C6H10O4 + 6.5 O2 = 6 CO2 + 5 H2O The weight of O2 is 1.42x the weight of dry wood. If the wood is 25% moisture, can reduce the O2 for...
  16. kenvlach

    Pickled and Oiled pipe

    Pickling is using an acid solution to remove oxide (mill scale, welding & heat treatment scale, rust). Usually done in either hot sulfuric or slightly heated hydrochloric acid solutions containing inhibitor. Easier than mechanical methods if both inside & outside of pipe must be cleaned. Oiling...
  17. kenvlach

    OM Energy

    "In the UK, scientists have developed a new technology, said to be the first of its kind, where vehicles would use water as the main fuel supply and need only a small amount of petrol. The vehicle would have a generator that extracts hydrogen from tap water to mix it with a normal petrol...
  18. kenvlach

    Galvanised Carbon steel internal material

    I'd guess the galvanizing layer to last 3-6 months in flowing seawater, less if very high flow rates.
  19. kenvlach

    Chrome Plating Die Cast

    Zinc alloy is easier to plate and costs less to die cast (lower melting temperature) than aluminum alloy. See FAQ about Die Casting http://www.diecasting.org/faq/#Proper
  20. kenvlach

    Stainless Steel to Stainless Steel Friction Factors

    From Carpenter Stainless Steels, page 329: Threshold Galling Stresses, self mated, unlubricated ground finish Annealed 304 (their Project 70): 8.0 ksi [55 MPa] Cold drawn 304 (their Project 70): 2.5 ksi [17 MPa]

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