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Longest,widest chips with machining parameters.
Longest chips would be from the machines that make steel wool - it's machined from wire drawn across fixed knives. -
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Corrosion Resistance of these Steels
Corten - See the USSteel building in Pittsburgh -
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Hard Bar Ends in HR 1045 ???
When the bars are cut too cold with a hot saw the ends harden. The ends might be 60 HRC, but in my experience only a 1/2 inch would be that hard. Nucor sizes top out at around 6-1/2 inches, so larger bars were from other mills. -
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A36 Scale thickness
My experience for bar stock is 1% weight loss, so 0.040" on a 4" plate would be in the same range. -
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Music wire tensile strength chart help
Still looking for your chart? Try: https://www.coursehero.com/file/64031929/Wire-Gauge-Chart-242707pdf/ Or search "music wire ksi" -
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ironmaking in 18th century
Phos comes from the ore and requires an acid (silicon) slag to remove. Sulfur comes from the coal and requires a basic (calcium) slag for removing. Most modern steelmaking utilizes basic slags -
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Very Rare Spark Testing Book
In the mills I worked the stuff out of the blast furnace was "hot metal". Iron saturated with carbon with some Si and Mn. If you solidified it in molds it was then "pig iron". Modern pneumatic steelmaking converts the hot metal to near pure iron with oxygen and then adds the carbon/alloys to... -
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Alloy choice to match grade 8 bolts
Can't help you with a source. I evaluated some construction screws ~10 years ago. The supplier escapes me. Look up Mechanical Galvanizing and you'll find suppliers. The coating looked like flame spray in cross-section. Main advantage was avoiding the softening from hot dipping or the... -
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Alloy choice to match grade 8 bolts
Mechanical deposition by tumbling in zinc powder is one way. There are thermo-mechanical methods like - GreenKote which tumbles the parts at elevated temperatures. -
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Alloy choice to match grade 8 bolts
Best option was given early in the thread - 17-4 ph to appropriate temper. When 4140/4340/4330V don't have the strength the next alloy is 17-4. -
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Oxy welding bells
The melting point lowers with increasing tin, but don't over do it. There's a phase change at ~75/25. Go past the phase change and all bets are off for solidification behavior.- Dave G.
- Post #17
- Forum: Fabrication: CNC Laser, Waterjet, Plasma, Welding
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Machining Hardened 17-4 Rings
Passivation is to remove any surface iron contamination from machining and handling. A smear of iron on the surface can cause breakdown of the passive film and result in pitting. -
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Material for corrosive liquid heat exchanger
Ti will work, but make sure the fluid has some dissolved oxygen. Deoxidized acid with chlorine will eat Ti. 300 series stainless will pit/crack. -
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Glass half full
The glass is full, some settling has occurred in shipping - Frido-Lay Engineer -
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XRF results, confusion in the form of Excell spreadsheet, Help ID this material.
So - Last guess is that this is a 10B22 grade. XRF would not see boron and would not be calibrated for a Ti addition, so a 0.03% Ti might be read as 0.12%. Trouble is a boron addition on a non-alloy bar at 8" dia. would be pointless. Unless the mill was getting rid of surplus as no-grade... -
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XRF results, confusion in the form of Excell spreadsheet, Help ID this material.
Can you spark test it to get the approximate carbon? Otherwise drill it and send the chips for LECO C/S. Mn is right for 1018 or similar grades, 0.737 Mn. Ni, Cr, & Mo are all at residual levels. Cu is a little high, but that could be from the precision of the XRF. The Ti is a head... -
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Surface grinding a Rockwell test block back to new condition?
I don't see why you couldn't regrind the hard block for non-certified work. Just a couple of points - On regrind you need to remove all traces of the work hardening from the first set of indents. It might be as much as 8X the original penetration depth - which is not that deep on the HRC 46... -
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Bead blasting aluminum for a work hardening effect?
Shot blasting won't improve the fatigue properties because there in no endurance limit for aluminum alloys. For steel, if you keep the load below a limit, the part will in theory last an infinite number of cycles. Aluminum does not have that same property, no matter how little the load - the... -
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Tool material question for striking wrench
Isn't 300M VIM-VAR (Vacuum Induction Melted then Vacuum Arc Remelted)? Very clean - much lower chance of fatigue failure. The added alloy allow the yield strength to reach over 200 ksi in large sections. Both very desirable. -
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Slightly OT: Would a parting tool make a good knife?
What grade is the parting tool? M2 tool steel? If it's M2 it will be brittle enough that the first time you try and pry with it it's going to break. Second question - how are you going to drill holes in it to attach a handle? Hope you have carbide drill bits.- Dave G.
- Post #2
- Forum: Fabrication: CNC Laser, Waterjet, Plasma, Welding