Laboratory Testing & General Mineral Processing Engineering

Laboratory Testing & General Mineral Processing Engineering

  • To participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN
  • Use Add New Topic to ask a New Question/Discussion about Mineral Processing or Laboratory Work.
  • OR Select a Topic that Interests you.
  • Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent).
    Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.
  • Use Add Comment = to comment on someone else’s Reply in an already active Topic/Discussion.

R&D (7 replies and 5 comments)

C
Johnsonwt
4 years ago
Johnsonwt 4 years ago
  Hi there, I have been going through much R&D to with a product to find one that is strong enough and rust proof. The latest is carbon steel with a zinc coating.. though salt water seems to penetrate it and cause blackening and some build up of salt maybe?

I am desperate for some advice as to what I should use, something strong enough as an allen key (similar use) And does not rust! Please if you have any advice for me it would be much appreciated.

Chris
Mike
4 years ago
Mike 4 years ago
Like
1 like by Johnsonwt

Most 300 grade stainless steels should work.

C
Johnsonwt
4 years ago

Thank you kindly smartdog. Perhaps 304?

What about chrome vanadium steel.. I believe it is just as strong and wouldn't rust too quickly?

Thank you for your time,

Mike
4 years ago
Mike 4 years ago
Like

Depending on temperature and other unlisted values, 304, 304L, 316, or 316L should be satisfactory. 

As for chrome-vanadium steels (6000 series) they are mainly used for their hardness.  If you are looking for a tool steel (for working on lathes) yes, if for just corrosion resistance, 3034 or 316 will work (depending on temperature).

C
Johnsonwt
4 years ago

Okay Brilliant, thank you very much !

C
Johnsonwt
4 years ago
Johnsonwt 4 years ago
Like
So for my problem, the company recommended the following advice.. remembering needs to be very strong and fairly rust proof. Any thoughts or recommendations on what they said?

Sus 304, 316  with  N2 treatment.  

SUS 630, SUS 4140 could be heat treated.

Mike
4 years ago

The 304/316 will be lower cost. The 630 (17-4) is similar to 304, but generally more expensive. The 4140 is also good, generally used for equipment frames (think bicycles) and other tubing applications. All would work, depends on how much you need, how long you plan to use it, and how much stress you plan to put it under.

C
Johnsonwt
4 years ago
Johnsonwt 4 years ago
Like

Okay understood, it will be intended to use on a sailboat so it needs to be rust resistant and similar torque to screwing in a screw nice and tight..
With this in mind, I am assuming 304/316 would not be strong enough.. even with N2 treatment? Which means heated 4140 or heated 630 I assume would be the winner?

Thank again for your expertise, I have been battling this for over a year! 

Mike
4 years ago

Actually the most common material for sailboats (if carbon fiber is out) would be 316, often called marine stainless). But again it depends on your particular application. For railings, deck fittings, and often mast components 316 is the most commonly used material. Life expectancy (with proper care - periodic washing) would be 10 to 15 years before any major degradation. Carbon fiber laminates even longer. This would even go for axillary shafting.

C
Johnsonwt
4 years ago
Johnsonwt 4 years ago
Like

Right, understood, but if it's a tool and has to handle a good amount of then torque I imagine 4140 may be better? And that is rust proof too correct?

Mike
4 years ago

yes

C
Johnsonwt
4 years ago
Johnsonwt 4 years ago
Like

great thank you!

C
Johnsonwt
4 years ago
Johnsonwt 4 years ago
Like

Hi Smartdog, one last question for you, would Martensitic stainless steel be a good fit as well?

Please join and login to participate and leave a comment.