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degrees of screw stainless steel



 
 
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  #11  
Old June 10th 17, 06:04 AM posted to rec.bicycles.tech
Emanuel Berg[_2_]
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Posts: 1,035
Default 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  
Old June 10th 17, 06:34 AM posted to rec.bicycles.tech
DougC
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Posts: 1,276
Default 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  
Old June 10th 17, 06:53 AM posted to rec.bicycles.tech
John B.[_3_]
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Posts: 5,697
Default 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  
Old June 10th 17, 09:11 AM posted to rec.bicycles.tech
Sepp Ruf
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Posts: 454
Default 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  
Old June 10th 17, 01:26 PM posted to rec.bicycles.tech
AMuzi
external usenet poster
 
Posts: 13,447
Default 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


  #16  
Old June 10th 17, 01:35 PM posted to rec.bicycles.tech
AMuzi
external usenet poster
 
Posts: 13,447
Default 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  
Old June 10th 17, 02:43 PM posted to rec.bicycles.tech
Emanuel Berg[_2_]
external usenet poster
 
Posts: 1,035
Default 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  
Old June 10th 17, 02:55 PM posted to rec.bicycles.tech
Emanuel Berg[_2_]
external usenet poster
 
Posts: 1,035
Default 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  
Old June 10th 17, 04:34 PM posted to rec.bicycles.tech
[email protected]
external usenet poster
 
Posts: 6,374
Default degrees of screw stainless steel

You missed JB ...

Read Mcmaster Carr

https://www.google.com/search?site=&...GdsFhHQj _Ak6
  #20  
Old June 11th 17, 12:00 AM posted to rec.bicycles.tech
Emanuel Berg[_2_]
external usenet poster
 
Posts: 1,035
Default 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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