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  1. MOB1

    CASE 1298 FBX Steel properties

    We are dealing with a road tanker for compressed gas and the documentation indicates it was manufcatured in Texas in 1966. The material used was steel noted as "Case 1298 FBX". I understand that the FBX is firebox steel but does anyone know what the material properties are (tensile and...
  2. MOB1

    Induction Hardening - Barberpoling effect

    I am interested in the so-called "barberpoling" effect produced on items which have been induction hardened. I understand that it is produced either by poor inductor design, non rotation of the part during hardening or quenching inadequacies. My question relates to the effect on fatigue...
  3. MOB1

    Fluorine Compounds ans Stainless Steel

    Does anyone have references which detail the problems of austenitic stainless steels and fluorine compounds? I have an aluminum smelter client who was attempting to change from carbon steel to austenitic stainless for a gas scrubber from the anode bake ovens. The gas contains all sorts of...
  4. MOB1

    Wrought Iron Bridge Tie Bars

    I am examining wrought iron road bridge components. The tie rods (joining top and bottom timber chords) have been upset forged at the threaded end to increase the thread root diameter above the shank diameter. Was this standard practice 120 years ago? Was it for fatigue resistance? I assume...
  5. MOB1

    Induction Hardened Steel Surface Etch Pattern

    I have seen two applications where the induction hardened surface of an alloy steel part of round cross section has a distinct circumferential pattern when polished and etched with Nital. One of these applications was a press brake roll which I observed some years ago. The etched surface...
  6. MOB1

    Growth of Ni-Resist Iron

    A recent example of growth of Ni-Resist type SG iron was experienced. The material was used as a bush and was frozen in liquid nitrogen for installation purposes. Is this just a martensite transformation issue? Any information?
  7. MOB1

    Heater Tube Wastage

    Carbon steel heater tubes for a wood drying kiln are experiencing selective corrosion/erosion at the 12 o'clock position from the steam side (bore). The tubes have aluminium fins. The steam is supplied from a boiler using correct chemical treatment (supposedly) and is at a temperature of 180C...

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