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  • Users: Jap1
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  1. Jap1

    Forged 6"thick 4340 steel bars

    If I choose either one, I would say the machining contractor. In this case we purchased these bars.
  2. Jap1

    Hydrogen embrittlement

    Thank you for you insight. I'll look into the procedure.
  3. Jap1

    Hydrogen embrittlement

    Thank you for you valuable feedback. I was told that stainless steel pipes were not available from a vendor, so we received A 519, 4140 QT 110 pipes, and some of pipes are over-sized due to the availability. I was reviewing the MTRs this Monday, and I had a thought that I should be concerned...
  4. Jap1

    Hydrogen embrittlement

    My company is going to make cylinders that made of 4140 Q&T steel pipe. Chrome plating is applied to cylinder surface after final machining. Tensile strength is around 145 ksi with HRC 32 based on the MTR. Do we need to worry about hydrogen embrittlement? Or do you suggest hydrogen baking...
  5. Jap1

    Forged 6"thick 4340 steel bars

    I need to look into hardenability data of 4340 steel. One bar is about 4000 lbs, and at least 3000lbs of steel is removed.
  6. Jap1

    Forged 6"thick 4340 steel bars

    Thank you for your insight. Perhaps normalized condition may be better for rough maching.? I was thinking about alternative options for bulk machining, since the final machined surface is likely to have lower hardness values due to the amount of machining. Perhaps we should get a forged ring...
  7. Jap1

    Forged 6"thick 4340 steel bars

    I have seen forged approx. 6"thick x 3feet width x 10 feet long forged 4340 steel bars at work The bar has been quenched, tempered, and stress relief to surface hardness HRC 40 bases on the MTR. Massive amount of bars, probably 80% of the bar is machined to make a semi circular shape. My...
  8. Jap1

    E 309L welding with/without preheating

    I don't want to disclose the detail, but it's a melting furnace shell. I'm not concerned about a code and I would rather know about any cracking issues for this particular welding. I'm asking here because I think that hydrogen dissolves in austenitic weld metal and does not diffuse into the...
  9. Jap1

    E 309L welding with/without preheating

    I should have mentioned this earlier, but this is T joint that requires 3/8" fillet weld. The 304L chamber is reinforced with 2" mild steels. If anyone thinks that preheating is not necessary, I would like to hear your thoughts.
  10. Jap1

    E 309L welding with/without preheating

    Thank you for your valuable advice. I'll keep it in mind that preheating is needed. As I cheched carbon content of A36, it's quite high. We are located outside of US, but we build it for the US customer,so I'm not sure which code is applied. It's not a pressure vessel, as welders don't need...
  11. Jap1

    E 309L welding with/without preheating

    We have joints that need to be welded with E 309L Flux cored arc welding. One of the base metal is 2" thick mild steel (A36), and the other is 0.5-1" thick 304L. My question is whether pre-heating for the mild steel is required or not because of the weld metal of 309L. I believe that hydrogen...

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