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  1. bovs7

    Quench Water Properties on Steel Hardening

    Hi all, Is anyone able to point me in the direction of any good references relating to properties of quench water employed to harden steels? Obviously there's a few bits and pieces on temperature, but we're looking more for anything relating to water cleanliness or salt concentration (not as...
  2. bovs7

    Help Identifying Alloy Steel Grade

    Hi just for the sake of those who responded, the steel grade has been identified - it's Japanese grade SNCM (nickel-chrome-moly steel) 630.
  3. bovs7

    Help Identifying Alloy Steel Grade

    Hi arunmrao, The sample is from a type of bolt... our initial guess was the material has been selected for some form of creep resistance. Sample was spectroanalysed... I've suggested re-testing. We wanted to be able to specify a grade of steel but since I've not found anything to date that...
  4. bovs7

    Help Identifying Alloy Steel Grade

    Hi all, I've got a steel chemistry that I can't seem to link to any standard steel grade - it may not be standard but if it is can anyone help with an identification for the following: C 0.27 Mn 0.5 Si 0.3 Ni 2.9 Cr 2.8 Mo 0.5 Any help appreciated!
  5. bovs7

    Holding Temperature Between Martensite-Start and Martensite Finish

    Hi metengr, My understanding of martempering is to rapidly cool to something above the Ms temperature so that a uniform, lower temperature austenite phase can be transformed to martensite with less stress while also avoiding any pearlite or bainite formation. I guess by extension then, my...
  6. bovs7

    Holding Temperature Between Martensite-Start and Martensite Finish

    Hi all, I have a question on the fundamentals of the martensite start and finish temperatures, so perhaps if someone can just point me to a good reference that'd be great! I understand that the amount of undercooling below the Ms temperature affects the ratio of martensite to austenite and...
  7. bovs7

    DI Calculations for Higher C Steel

    Hi metengr thanks for the reference! I have finally traced it down and it's very helpful. I do have one question still though. The article talks about the prior normalisation or quench temperature as determining the hardenability factors. I haven't quite understood however if this is...
  8. bovs7

    DI Calculations for Higher C Steel

    Thanks for the interesting link. The reason I am using Grossman calculations is that I am trying to assess theoretical hardness profiles for given chemistries. In particular, I am trying to demonstrate that a potential material for our part will, even at its minimum chemistry, give us a...
  9. bovs7

    DI Calculations for Higher C Steel

    Hi, I've been trying to use ASTM A255 to try and calculate DI values and ultimately theoretical hardness profile for a new trial steel grade we are sourcing to make parts of up to 125 mm diameter. Problem is the new steel grade is 1% C. ASTM only designates for up to 0.7% C... I've tried...

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