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Recent content by Dave G.
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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...