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Member

Join Date: Mar 2008
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Can hardened tool steel be plated like...

04/16/2008 1:31 AM

Can any one thriough a light on whether hardened tool steel can be zinc plated and electoless nickel plated. if yes what is the range of rockwell hardness and its peel of strength?

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#1

Re: Can hardened tool steel be plated like...

04/16/2008 10:53 PM

Yes it can plated, but (to my knowledge) the plating will only be as hard as it would be on soft, unhardened steel. As far as peel strength-that might depend on the type of tool steel chosen as certain types might have less "tack" depending on the alloying agents. The content of Chromium comes to mind here.

What I would be concerned about would be embrittlement of the parent steel just below the layer of plating. And I realize this may not be an issue at all. It is typically only an issue when the hardened steel must possess a sharp edge such as for a punch or die application.

Unfortunately, I do not have the experience with plating as I do with heat treatment. I too am interested to see what is posted here.

Best Regards,

Ing. Robert Forbus

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#2

Re: Can hardened tool steel be plated like...

04/16/2008 11:05 PM

Tool steel is hardened by transformation of microstructure to martensite.

Alloy steel fasteners achieve their properties as well by quenching and tempering to form martensite.

Many/most alloy high strength fasteners are plated by various materials including zinc and nickel, as well as a host of chromates. (well used to be ahost of chromates, thats another story.)

Issue with electroplating hardened steels is the problem of hydrogen accumulation,leading to embrittlement. Most fastener specs call out for a baking process for a prescribed time and temperature to allow the hydrogen to diffuse.

Can't give you data on hardness of coatings, nor adhesion. but the idea of using a rockwell test for a very thin plated coating is abit of a miss. I believe that a superficial hardness test would be the way to go. But neither Zinc nor nickel are applied for the achievement of "hardness" per se.

Your question needs better explained before we can help you with the platings 'attributes.'

milo

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#3
In reply to #2

Re: Can hardened tool steel be plated like...

04/17/2008 12:15 AM

Hi, thanks for your reply. your answer is convincing me. But Rc Hardness level that I have mentioned here is about parent material that is subjected to plating. Secondly the materials could be case hardened steel, HcHcr, OHNS, EN8 En19, EN 24, En 32B, EN36, EN45, etc as we use this tool steels under different hardness with heat treatment like Toughning, case hardening, full hardening etc., considering the appliction like sliding part, cutting and forming Punches and also to give corrosion resistance and easthetics to jig-fixtures parts. Now I hope I have put my question in detail and hope for the best knowledge sharing from you. Regards- rvdhara

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#5
In reply to #3

Re: Can hardened tool steel be plated like...

04/17/2008 3:18 AM

One more thing to take into consideration is the part service conditions (application). I think there are differences in a fastener, from which you expect tensile strength and maybe toughness, and an sliding part, from which you expect abrasion resistance.

For sliding part I don't see the need to use a hardened steel and make a zinc plating. Zinc is much softer than steel and will disappear quickly.

For a fastener, the mechanical strength is given by the hardened steel but you can give it a plating treatment to improve corrosion resistance, it's a quite common practice.

Best regards

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#6
In reply to #3

Re: Can hardened tool steel be plated like...

04/17/2008 7:28 AM

Your questions seem to be answered.

However, dont forget about the range of other surface coatings (Titanium Nitride, Chromium Plating, Titanium Carbonitride) and other stainless tool steels you could use.

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#8
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Re: Can hardened tool steel be plated like...

04/17/2008 11:06 AM

I believe that Kwetz and others have provided you good insight as to what the plating would or would not contribute to the parts in use (sliding punching etc) where the plating would interfere and quickly be removed. The idea of using other coatings like TiN etc sounds like a possibly better approach for the "working surfaces."

milo

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#4

Re: Can hardened tool steel be plated like...

04/17/2008 12:34 AM

For your application, on jigs/fixtures, i suggest you try black oxidation . It gives very good corrosion resistance & aesthetics .It holds good on OHNS , case hardened,hardened steels..

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#7

Re: Can hardened tool steel be plated like...

04/17/2008 10:48 AM

I got into an issue about heat treated B-7 studs being galvanized many years ago. As best as I remember at the time you lost some of the strength rating when the studs were galvanized. I think it was due to the heat from the galvanizing affected the heat treatment of the studs. We started using the teflon coated heat treated studs and they are very nice. You can get them in many different colors and they don't rust as long as someone doesn't use a pair of channel locks or vise grip pliers to tighten them. http://www.texasbolt.com/ is where we get ours and the prices are very good. It is a very good selling point on the piping skids we build when all the studs are the same color and no rust trails running down the painted flanges after a couple of rains. I am sure that other types of steel could be teflon coated without damaging their hardness if studs can. Might be worth checking into.

pipewelder

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Users who posted comments:

Ing. Robert Forbus (1), Jonny5 (1), Kwetz (1), Milo (2), pipewelder (1), raghava.kn (1), rvdhara (1)

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