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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#41
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New steel I don't recognize
On Fri, 09 Oct 2015 08:11:25 -0500
"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote: Well... got out to the shop this a.m. to find something different. Last night, I sparked out a piece, and it looked for all the world like just ordinary structural steel. A piece of A36 next to it made the same sparks... BUT... for a long time (a couple of seconds of grinding...) no sparks. So today, I took it back in the shop, mic'd a flange, then ground lightly just until I saw the first sparks, and mic'd it again. There's darned- near 15 mils of zinc on this stuff! Further, I had treated a cut end last night with potassium nitrate/water slurry. This a.m. there WAS some visible rust on the cut surface. The untreated cutoffs I left out in the dew, now, for two nights are still pristine. So, even though these flanges are about 3/8" thick, I guess I'll have to go with Ed's surmise that the 'galvanic cell' process is keeping the cut edges from rusting, unless otherwise accelerated to do so. Huh! I guess I just got a lesson in how good at its job GOOD galvanizing can be! LLoyd Maybe try stripping all the galvanize off a test piece and then see how fast/much that rusts? -- Leon Fisk Grand Rapids MI/Zone 5b Remove no.spam for email |
#42
Posted to rec.crafts.metalworking
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New steel I don't recognize
Leon Fisk fired this volley in news:mv8v2m$pn$1
@dont-email.me: Maybe try stripping all the galvanize off a test piece and then see how fast/much that rusts? Heh! Not worth the trouble! All I needed was a couple of heavy mount brackets for a pyrotechnic mold, and was surprised by the behavior of this piece. I think it's solved. Lloyd |
#43
Posted to rec.crafts.metalworking
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New steel I don't recognize
My bet is the zinc is acting like an anode and absorbing all of the
oxygen that would do the rusting. Just like an anode on your boat to keep it from melting away. It melts away. Martin On 10/9/2015 8:11 AM, Lloyd E. Sponenburgh wrote: Well... got out to the shop this a.m. to find something different. Last night, I sparked out a piece, and it looked for all the world like just ordinary structural steel. A piece of A36 next to it made the same sparks... BUT... for a long time (a couple of seconds of grinding...) no sparks. So today, I took it back in the shop, mic'd a flange, then ground lightly just until I saw the first sparks, and mic'd it again. There's darned- near 15 mils of zinc on this stuff! Further, I had treated a cut end last night with potassium nitrate/water slurry. This a.m. there WAS some visible rust on the cut surface. The untreated cutoffs I left out in the dew, now, for two nights are still pristine. So, even though these flanges are about 3/8" thick, I guess I'll have to go with Ed's surmise that the 'galvanic cell' process is keeping the cut edges from rusting, unless otherwise accelerated to do so. Huh! I guess I just got a lesson in how good at its job GOOD galvanizing can be! LLoyd |
#44
Posted to rec.crafts.metalworking
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New steel I don't recognize
On Fri, 09 Oct 2015 07:19:51 -0500, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote: " fired this volley in : So if the fresh cut ends do not rust, why did they bother to galvanize it? Umm.... If I knew that, then I'd not have asked! I'm going to do another 'wet' experiment, this time with salt in the wound. It could be this stuff was prepared for a marine environment, although I don't recall the use of gavanizing from when I was in the Navy. Lloyd To me it sounds like racking for switchgear or high voltage transmission towers. The crossbeams that hold the insulators are generally heavily hot dip galvanized . |
#45
Posted to rec.crafts.metalworking
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New steel I don't recognize
On Friday, October 9, 2015 at 4:10:50 AM UTC-7, slow eddy failed:
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#46
Posted to rec.crafts.metalworking
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New steel I don't recognize
On Friday, October 9, 2015 at 4:09:36 AM UTC-7, slow eddy lied:
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