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  1. TVP

    4340 crs vs hrs quench and temper

    Just to add to what MagBen said, it is impossible to obtain round steel bars as Cold Rolled. Round steel bars can be Cold Drawn through a die, but not rolled. So specifying CRS will only lead to confusion. Cold drawing is very common in sizes below 2" in diameter. Very uncommon in sizes above this.
  2. TVP

    cast Aluminum S-N curves

    A356 with T6 heat treatment (solution treat + artificial aging) is the standard high strength alloy for sand and permanent mold casting. Here are some links with data on fatigue properties including S-N curves: https://tel.archives-ouvertes.fr/file/index/docid/661622/filename/Angeloni2011.pdf...
  3. TVP

    ASTM B918

    AEKen, For the solution heat treatment time, did you consult Table 3 of ASTM B918? The time depends on the thickness of the part. Regarding T73 precipitation treatment, this is a 2-stage process that must be performed in the correct order: 1st precipitation treatment is 215-235 F for 6 to 8...
  4. TVP

    Retained Austenite on 20MnCr5 material

    olds, Sorry for the delay in responding, regular work has been busy the past week. Anyway, if I understand you correctly, you are saying that this part has a cross-section that is a maximum of 1.3 mm? That is extremely small for a carburized part. Most carburized parts are shafts or gears with...
  5. TVP

    Retained Austenite on 20MnCr5 material

    In my experience, the automotive industry routinely carburizes 20MnCr5 to achieve surface hardness > 58 HRC with less than 25% RA (usually much less than this) without using a sub-zero/freezing step. Surface carbon is usually in the range of 0.7 to 0.9%. One critical factor is the geometry of...
  6. TVP

    steel strength

    petar, Automotive shafts for driveline and transmission applications are either surface hardened by induction heat treatment, or by case carburizing. Typical surface hardness is 59 HRC minimum, which means that a surface bending stress under maximum load should be less than ~ 2200 MPa. The...
  7. TVP

    identifying steel grade from chemistry

    If this is made in Europe or Asia, it is quite likely that this is a standard grade of steel with a small Cr addition for increased hardenability, as metengr noted. 27MnCrB5-2 according to EN 10083-3 fits your stated composition if you include B in the range of 0.0008 to 0.005.
  8. TVP

    Blistering during Heat Treatment of AA 6061

    480 C (900 F) is the maximum recommended forging temperature for 6061 (ASM HANDBOOK Volume 4). It is possible that the high temperature is contributing to the blisters. Grain growth can occur at temperatures above 400 C, especially if there is any prior cold working of the surface, and this...
  9. TVP

    Is EN353 cold forgeable as much as SCM420

    The addition of > 1.5% Ni increases the flow stress of the steel, making cold forging more difficult. The higher flow stress increases forces and hence stresses on the tools, which makes it more difficult to achieve adequate tool life. Most net-shape gears using EN353, SAE 4320, or similar...
  10. TVP

    Corrosion resistant paint on Brass

    Does the environment also have a component of exposure to ultraviolet radiation? If not, then I agree with suggestion of epoxy coating. If so, then you will need to evaluate some different coatings, because epoxies are degraded by UV.
  11. TVP

    Aluminum Diecast (A360) & Aluminum Extrusion (6061 T6)

    I'm just getting back to reading this thread. High pressure die cast alloy 360 is NOT suitable for service near an ocean or other environment with continuous exposure to mist/spray/splash of saltwater. This alloy has very poor corrosion resistance. The pre-treatment for the coating will need to...
  12. TVP

    Aluminum Diecast (A360) & Aluminum Extrusion (6061 T6)

    Can you provide some additional information: - What type of welding process was used (GMAW, GTAW, LBW, etc.)? - Was filler metal used? If so, which alloy? - Corrosion in what environment? In general, high pressure die castings do not have very good corrosion resistance, and welds will be even...
  13. TVP

    HV=220 of steel 37 sheet , does full annealing work and make the hardness reach to 140 ?

    Yes, full annealing of this low carbon steel grade should reduce the hardness from 220 HV to approximately 140 HV.
  14. TVP

    Alodine 1200

    If the aluminum is not in contact with steel, stainless steel, or another metal that is galvanically more noble, then this alloy and coating combination should be ok for 5-6 years. A general urban environment is not very aggressive for even bare aluminum. Things like acid rain, animal waste...
  15. TVP

    ASTM code to evaluate J-integral

    ASTM E1820
  16. TVP

    use of polyhedrons (tensile strength)

    Don't take this the wrong way, but I have no idea what you are describing. I don't understand what the purpose of the polyhedrons is, nor why this would add wear and tear to the machines. Can you add some details to clarify?
  17. TVP

    Measuring surface roughness of skinny plastic part

    This sounds like a good candidate for non-contact surface measurement using an optical or laser-based method. There are many different manufacturers of this equipment and service providers that use it. Here is one link for more information: http://www.azom.com/materials-equipment.aspx?cat=206
  18. TVP

    locating cone material

    Flame hardened 1045 or 4140 will not have the same wear resistance as A2 through hardened to 56-58 HRC. I would use a proper tool steel rather than experiment with something "cheaper".
  19. TVP

    AISI 1008 steel mechanical properties

    It costs $100 or less to have a certified lab perform tensile testing. According to ISO 18265, 68 HRB is equivalent to an approximate tensile strength of 400 MPa (58 ksi). Yield strength probably would be 310-350 MPa, based on my quick review of SAE J2392 and EN 10139.
  20. TVP

    Hard Chrome Alternative

    Ferritic nitrocarburize + oxidation (ONC black, Kolene QPQ, Arcor, etc) should be cheaper. This process can be and is routinely performed on tubular components for hydraulic cylinders. What is the diameter and wall thickness of these tubes?

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