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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...- Jap1
- Thread
- Replies: 6
- Forum: Material engineering general discussion
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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...- Jap1
- Thread
- Replies: 10
- Forum: Machines & Machining engineering
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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...- Jap1
- Thread
- Replies: 9
- Forum: Welding, Bonding & Fastener engineering
