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  • Users: jwhit
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  1. jwhit

    welding different grades of steel?

    Before designing with the referenced materials, I would suggest doing a little research into the weldability of them and what is required to make a safe sound weld in the field. Hint, these aren't materials you just start welding away at. The advice to get a welding expert involved is a good one.
  2. jwhit

    Welding certs

    Pipewelder, thank you for sharing! I think there are a lot of us who have issues with getting the people around us (at all levels of the business) to comprehend what qualification is about, other than a little window dressing.
  3. jwhit

    Weldability

    Often the Material Specification or the Construction Specification will give you the formula to use. For ASTM materials it may be listed in the Supplementary requirements. If building a NACE compliant component their formula will be found within the specification. Regardless, the formula that...
  4. jwhit

    Fit, Form and Function

    I appreciate the responses. The logic that we run into sometimes is incredible,at least in my opinion. Every day, I'm glad that my time dealing with this stuff is dwindling. Retirement or semi-retirement can't come soon enough.
  5. jwhit

    Fit, Form and Function

    Every now and then I run across someone using the term Fit,Form and Function, which to me is established in the engineering stage and verified in the inspection stage. The issue I have is when they attempt to extend that terminology to inspection for material discontinuities. To my way of...
  6. jwhit

    LCB heat treatment for reduced UTS

    When they have it in metal, you have to work with what you've got. Going forward, you may suggest they take a look at this post or some of the others on LCB/LCC and let them figure out on their own that they can in fact help themselves out by juggling composition a little.
  7. jwhit

    Cast steel or forged body valve.

    Visually, it looks more like a forging than a casting. If it was a casting the markings would be CF3M rather than 316L.
  8. jwhit

    LCB heat treatment for reduced UTS

    arun, Thank you for the compliment, the recognition is appreciated, esp. since in the work environment I get the "are you nuts" kind of looks for these things. The price for having mainly OJT knowledge and no degree,I guess.
  9. jwhit

    LCB heat treatment for reduced UTS

    With the heat treatment you are using, I wouldn't expect the problem to be heat treat specific. Your temps look good. Usually when there is an issue with excess tensile strength in LCB it is related to running the carbon to the high side of the spec. Where notch toughness is concerned, it is...
  10. jwhit

    Mill MTR charpy standard

    This is twice today that I'm on the same page as Redpicker. Normally, you do not have to include the testing spec. on the MTR. If you are working to ASTM or ASME it is at the least implied that the testing will be done to A370/E23 unless otherwise specified by your customer, in which case it...
  11. jwhit

    What type of steel is this?

    I agree with Redpicker about the residuals, it is the one's that aren't reported that are of concern. I don't see rock candy in the fractures, but would also take a good look at your aluminum content in case you are dealing with some aluminum nitride. Also considering the bridge material...
  12. jwhit

    Steel for -60°C

    Take a look at ASTM A352 Grades LC2 and up. I think one of them may get you where you need to go.
  13. jwhit

    Can CF8M cast valve disc be magnetic

    CF8M castings will usually have a small degree of magnetism, the ferrite content is usually controlled to fall in a range of about 5 to as high as 20% with ~8-15% being preferred. The ferrite is slightly magnetic. In castings the presence of ferrite helps to prevent weld cracking due to hot...
  14. jwhit

    Pull rods for creep test

    You might also check with Instron, I believe their Satec division is still building creep machines and pull rods.
  15. jwhit

    Liquid Penetrant Examination

    LF2 is a ferromagnetic material, therefore, MPI can be performed. The advantage to MPI is that surface and near surface defects may be located depending on method and technique used. As a rule, if the material is strongly magnetic, use MPI. If non-magnetic use LPI.
  16. jwhit

    WCB NT & QT tensile fail...

    You should not be having issues with a carbon of 0.21% and a CE of 0.40. This would fall within the requirements for NACE material, if it is for oilfield useage. Fracture appearance of the failed test bars would be good to see. What is your aluminum content? You don't want to exceed about 0.07...
  17. jwhit

    WCB NT & QT tensile fail...

    I just looked at your additional posts, take a good hard look at your raw materials and also how much revert goes into your furnace charge.
  18. jwhit

    WCB NT & QT tensile fail...

    Can you list the composition for some of the failed heats? Your temperatures look like they should work without problem, so I suspect a chem issue, or possibly a raw materials issue. Is there any evidence of defects in the broken test bar halves, for instance gas or shrinkage? Rough looking...
  19. jwhit

    Localized Heat Treatment for 17-4

    Before you do anything else, determine whether or not you can give up the strength you will lose by heating it to a point where it is ductile enough to bend readily. Is it something you can put into a furnace at the solution treating temperature, pull out, then bend hot? After bending, allow it...
  20. jwhit

    low temperature magnetic material

    Magben, That is a good question and one I have pondered at times. The same holds true for A216 Gr.WCB and WCC, which are for use at warmer temperatures,that is, above -20F and have the same composition requirements. I had occasion to look at some LCC impact test results today and they ranged...

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