SS as a wear resistant lining 2

[odie5070]

I have a customer that hauls light weight aggregate materials to construction sites across the midwest. This aggregate develops a Ph of 14+ when wet. We would normally use Hardox from SSAB to line haulers. I do not believe that Hardox will stand up to the Ph levels. He asked me if building a SS tilt bed would alleviate his problem. I know that SS will not wear like a traditional wear resistant material. A complete SS bed is roughly $80K for this type hauler. I have 3-possible solutions as I see them:

1--SS bed (I am not sure which type to use)
2--SS or Aluminum lining with Teflon/Kynar/Halar coating on contact surfaces.
3--Teflon coated wear plate.

I was wondering if anyone in this forum might be able to offer suggestions or expertise to this problem.

Regards Timothy C. Odom, CEO
Odom Industries, LLC
Phone: 513-777-3773
Fax: 513-777-7223

 

[TVP]

The former Armco Steel, now AK Steel, developed a stainless steel alloy called Nitronic 30 (UNS S20400) that should be ideally suited for this application. It has very good mechanical properties (from cold working, not heat treating) and good corrosion resistance. It is also cheaper than typical austenitic alloys because the Ni content is very low-- austenitic stabilization is provided by Mn and N. You can find more information at the following website:

http://www.aksteel.com/markets/pdf/Nitronic_30_Data_Bulletin.pdf

Comparing the options that you listed, I would definitely go with the SS (Nitronic 30) option. I suspect there would be some challenges in maintaining a durable lining if you used aluminum and coatings. Same with coated wear plate.

I may be able to assist you further regarding this project. Feel free to email me at tpadfield1@comcast.net if you would like to discuss the application in more detail.

 

[CoryPad]

TVP gave good advice, I just want to mention that aluminium oxide is soluble under basic conditions, so even with coatings, I think aluminium alloys are inappropriate for this application.

 

[odie5070]

TVP

Thanks for the info...funny thing is that I have done so much work for AK Steel Middletown and Ashland plants that you would think that I would have immediately thought of Nitronic 30. It totally slipped my mind...As a matter of fact I have convinced many of their maintenance eng. to move from Nitronic 30 to Hardox in many of their non-caustic app's within the plant. You are correct Nitronic 30 would be an excellent solution to this dilemma.

Many thanks. Timothy C. Odom, CEO
Odom Industries, LLC
Phone: 513-777-3773
Fax: 513-777-7223

 

[mcguire]

Nitronic 30 is a good material but you needn't buy a proprietary alloy. Aisi 201, requested with low nickel, will get you more competitive bids.
Don't neglect that this can be bought in high strength versions ( via cold work).

 

[Mandrake22]

ODIE,

I believe you will find that the high ph material will, if anything, PROTECT the carbon steel surface. Only things on the acid side of the scale will eat away at the surface.