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#11
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degrees of screw stainless steel
John B. wrote:
Galvanizing is the coating of steel (usually) with zinc. Two common methods are by "hot dip", immersing the object in a vat of molten zinc, and plating which is an electrical-chemical method of depositing zinc onto a part. Generally speaking, hot-dip results in the thickest coating. Amazing, so galvanizing is zinc as well! Perhaps "galvanized" is the hot dip, "electro-galvanized" is the electro-chemical method, and "zinc plated" is the zinc spray can only it is done by a robot? So all these methods are coating which makes then inferior to S/S as that is the entire material (?), and it even has a "chromium oxide layer" to protect it even more! -- underground experts united http://user.it.uu.se/~embe8573 |
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#12
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degrees of screw stainless steel
On 6/9/2017 9:01 PM, wrote:
Silver tarnishes ? For bicycle use go with grade 5 5 is hard strong steel somewhat rust resistant.. Coat with thinned linseed Hardware store SS maybe grade 2.5. Go to the industrial era. Incorrect... in this instance. The SAE system is only used in the US, and it is only used for carbon (non-stainless) bolts and nuts. http://www.engineeringtoolbox.com/st...es-d_1426.html Who is SAE https://en.wikipedia.org/wiki/SAE_International Stainless bolts usually only have one-half to one-third the tensile strength of "regular-steel" bolts, by the by. The stainless is tougher though (it can take repeated flexing better). ~~~ There's a bunch of screw thread standards too. Pick any one you want https://en.wikipedia.org/wiki/Screw_...andard_threads |
#13
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degrees of screw stainless steel
On Sat, 10 Jun 2017 07:04:11 +0200, Emanuel Berg
wrote: John B. wrote: Galvanizing is the coating of steel (usually) with zinc. Two common methods are by "hot dip", immersing the object in a vat of molten zinc, and plating which is an electrical-chemical method of depositing zinc onto a part. Generally speaking, hot-dip results in the thickest coating. Amazing, so galvanizing is zinc as well! Perhaps "galvanized" is the hot dip, "electro-galvanized" is the electro-chemical method, and "zinc plated" is the zinc spray can only it is done by a robot? I believe that "plated" refers only to the electro-chemical coating of zinc on whatever the base metal is. There is a process called "cold galvanizing" which is simply a zinc rich paint. "Zinc-rich paints contain 65-95% metallic zinc in dry film, with 92-95% being common". Zinc plated directly onto steel provides a certain amount of cathodic protection while the zinc rich paints often provide a lesser amount protection.. So all these methods are coating which makes then inferior to S/S as that is the entire material (?), and it even has a "chromium oxide layer" to protect it even more! Not necessarily inferior. Hot dip galvanizing is quite often used in heavy duty exterior constructions as it is long lived and much cheaper then a stainless part. Re Chromium oxide. The chromium oxide that forms on the surface of a "stainless" steel item is what makes it non corrosive. https://en.wikipedia.org/wiki/Stainl...eel#Properties "The chromium forms a passivation layer of chromium(III) oxide (Cr2O3) when exposed to oxygen. The layer is too thin to be visible, and the metal remains lustrous and smooth. The layer is impervious to water and air, protecting the metal beneath, and this layer quickly reforms when the surface is scratched." -- Cheers, John B. |
#14
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degrees of screw stainless steel
John B. wrote:
Emanuel Berg wrote: John B. wrote: Galvanizing is the coating of steel (usually) with zinc. Two common methods are by "hot dip", immersing the object in a vat of molten zinc, and plating which is an electrical-chemical method of depositing zinc onto a part. Generally speaking, hot-dip results in the thickest coating. Amazing, so galvanizing is zinc as well! Perhaps "galvanized" is the hot dip, "electro-galvanized" is the electro-chemical method, and "zinc plated" is the zinc spray can only it is done by a robot? I believe that "plated" refers only to the electro-chemical coating of zinc on whatever the base metal is. There is a process called "cold galvanizing" which is simply a zinc rich paint. "Zinc-rich paints contain 65-95% metallic zinc in dry film, with 92-95% being common". Zinc plated directly onto steel provides a certain amount of cathodic protection while the zinc rich paints often provide a lesser amount protection.. So all these methods are coating which makes then inferior to S/S as that is the entire material (?), and it even has a "chromium oxide layer" to protect it even more! Not necessarily inferior. Hot dip galvanizing is quite often used in heavy duty exterior constructions as it is long lived and much cheaper then a stainless part. Re Chromium oxide. The chromium oxide that forms on the surface of a "stainless" steel item is what makes it non corrosive. https://en.wikipedia.org/wiki/Stainl...eel#Properties "The chromium forms a passivation layer of chromium(III) oxide (Cr2O3) when exposed to oxygen. The layer is too thin to be visible, and the metal remains lustrous and smooth. The layer is impervious to water and air, protecting the metal beneath, and this layer quickly reforms when the surface is scratched." The irony of needing to school an ignorant "physics expert" Swede about steel! Have the femi-socialist librarians removed all the climate-destroying, male-dominated metals and engineering books? Or just too scared to ask some of the supposed blue-collar zombies at the hardware store's nuts and bolts isle? |
#15
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degrees of screw stainless steel
On 6/9/2017 9:04 PM, Emanuel Berg wrote:
Emanuel Berg wrote: The socket screws are DIN 912 / ISO 4762 Socket Cap Screw A2/A4Â Stainless Steel and the washers are DIN 125 / ISO 7089, 7090 Flat Washer A2/A4Â Stainless I have a German Heyco double ended spanner (10 and 13 mm) which is DIN 895. Wow, what does it all mean? Some German system of standardization... I own some specialty Heyco wrenches. Nice quality. Yes, DIN = German Industrial Standard, which has become more successful than the French format SI. SI is called Standard Internationale because no one else uses it. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
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degrees of screw stainless steel
On 6/10/2017 3:11 AM, Sepp Ruf wrote:
John B. wrote: Emanuel Berg wrote: John B. wrote: Galvanizing is the coating of steel (usually) with zinc. Two common methods are by "hot dip", immersing the object in a vat of molten zinc, and plating which is an electrical-chemical method of depositing zinc onto a part. Generally speaking, hot-dip results in the thickest coating. Amazing, so galvanizing is zinc as well! Perhaps "galvanized" is the hot dip, "electro-galvanized" is the electro-chemical method, and "zinc plated" is the zinc spray can only it is done by a robot? I believe that "plated" refers only to the electro-chemical coating of zinc on whatever the base metal is. There is a process called "cold galvanizing" which is simply a zinc rich paint. "Zinc-rich paints contain 65-95% metallic zinc in dry film, with 92-95% being common". Zinc plated directly onto steel provides a certain amount of cathodic protection while the zinc rich paints often provide a lesser amount protection.. So all these methods are coating which makes then inferior to S/S as that is the entire material (?), and it even has a "chromium oxide layer" to protect it even more! Not necessarily inferior. Hot dip galvanizing is quite often used in heavy duty exterior constructions as it is long lived and much cheaper then a stainless part. Re Chromium oxide. The chromium oxide that forms on the surface of a "stainless" steel item is what makes it non corrosive. https://en.wikipedia.org/wiki/Stainl...eel#Properties "The chromium forms a passivation layer of chromium(III) oxide (Cr2O3) when exposed to oxygen. The layer is too thin to be visible, and the metal remains lustrous and smooth. The layer is impervious to water and air, protecting the metal beneath, and this layer quickly reforms when the surface is scratched." The irony of needing to school an ignorant "physics expert" Swede about steel! Have the femi-socialist librarians removed all the climate-destroying, male-dominated metals and engineering books? Or just too scared to ask some of the supposed blue-collar zombies at the hardware store's nuts and bolts isle? I also wondered at that, as the world's first modern crucible steels were made with Svensk materials. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#17
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degrees of screw stainless steel
Sepp Ruf writes:
The irony of needing to school an ignorant "physics expert" ? Swede about steel! Have the femi-socialist librarians removed all the climate-destroying, male-dominated metals and engineering books? Or just too scared to ask some of the supposed blue-collar zombies at the hardware store's nuts and bolts isle? Tough on the net, huh? Would you dare say that to me face to face? Yeah, that comment about the blue-collars really hurt you, didn't it? Maybe because you know it is actually THEY who by now hardly read any books, let alone engineering books, and it is THEY who take no interest in nuts and bolts whatsoever but only care for tasteless cars and MCs they know nothing about, and sports they themselves do not practice? -- underground experts united http://user.it.uu.se/~embe8573 |
#18
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degrees of screw stainless steel
AMuzi writes:
I also wondered at that, as the world's first modern crucible steels were made with Svensk materials. Oh, yeah? And I suppose you are a great exterminator of Native Americans? Isn't that American history 101? Sweden was very industrialized but that's long gone just like it is in Belgium, France, Italy ... Here, the working class grew bigger until ~1980 but a lot of those businesses stopped earlier, like from the mid-60s or so. As for the working class it was a different matter because they worked in huge facilities, not the total fragmentation of today with two carpenters in a van going at 135 km/h between jobs... There was also a big social-political movement to it with sports, education, culture, all of that equally gone. So no, I didn't learn anything about steel in school and at the university computers so again no steel. -- underground experts united http://user.it.uu.se/~embe8573 |
#19
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degrees of screw stainless steel
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#20
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degrees of screw stainless steel
John B. wrote:
I believe that "plated" refers only to the electro-chemical coating of zinc on whatever the base metal is. There is a process called "cold galvanizing" which is simply a zinc rich paint. "Zinc-rich paints contain 65-95% metallic zinc in dry film, with 92-95% being common". On a closer look, the bolts are from two different brands! The first brand is either "stainless steel A4", "electro-galvanized", or "galvanized". The second brand is "zinc plated". Because electro-galvanized and galvanized in effect amount to zinc plated, I suppose the one brand focuses on the method in their markings, and the second on the result, so perhaps the "zinc plated" are also galvanized? Or are there yet additional methods to achieve zinc plating except for galvanization? Because as you described it IIUC just applying zinc spray or paint does not qualify as plating? -- underground experts united http://user.it.uu.se/~embe8573 |
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