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10 Reasons Why Nickel Silver is Superior for Elevator Sills

10 Reasons Why Nickel Silver is Superior for Elevator Sills

Nickel Silver is the Primary Option for Elevator Sills. We answer why.The Mac Metals team is often asked why nickel silver is preferred over stainless steel for elevator sill applications and have compiled the following reasons why nickel silver (Alloy C77600) is superior to stainless steel (304).

Here are 10 reasons why Nickel Silver is the Best Option for Elevator Sills:

 

Reasons Nickel Silver is Superior to Stainless Steel in Elevator Sills

 For reference, stainless steel is to be referred to as S304

  1. Nickel silver exhibits a distinctive soft silver hue, color tone, especially when polished closely resembles that of sterling silver.  S304 exhibits a harsher gray tone.
  2. Nickel silver is extremely close to S304 in tensile (91ksi, 629MPa) and superior in yield strength (47ksi, 322Mpa @ .2%offset) compared to S304 (Tensile 90 ksi, 621 Mpa) (Yield 290MPa, 42 ksi @ .2% offset) yet are much more workable, facilitating manufacturing processes.

  3. The mechanical properties of nickel silver are sufficient for loads commonly associated with this application.  This is substantiated by the excellent real-world performance of this alloy supplemented by the fact that alloys of even lower yield and tensile strength of alloy C38500 (architectural bronze).

  4. Rockwell Hardness of nickel silver on the B scale is 83 vs. 82 for S304.

  5. Nickel Silver is easier to extrude and can thus be extruded in thinner sections.  As a result, although the density of nickel silver is slightly higher, less material is used in each section, resulting in a lighter component.

  6. To enhance the ability of nickel silver to be extruded are the alloying elements of zinc and (to a much lesser quantity) lead.  Both have lubricity properties and enhance extrusion.

  7. The superior lubricity of nickel silver can provide lower wear on associated components (nibs, gibs, wheels, etc.).

  8. S304 contains chromium as an alloying element for high temperature oxides that are abrasive.  This causes increased tool wear and resistance to extrusion.

  9. Nickel silver is easily joined at a lower temperature.

  10. Nickel silver is easier to polish to a high gloss.

Thanks to Larry Peters and Jim Michel from CDA (Copper Development Association) for their help in the article.

About Mac Metals

Mac Metals Inc. is a “specialty brass mill” providing custom architectural metals to architects, general contractors, original equipment manufacturers, machine shops and architectural and ornamental metal fabricators that require custom extrusions made of brass, bronze and nickel silver. They can be contacted at 800-631-9510, or www.macmetals.com.


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