What is Naval Brass?

Naval Brass refers to a copper alloy of around 59% Copper 40% Zinc and 1% Tin with a trace amount of Lead.  This alloy falls into the subfamily for Brasses known as Alpha Beta or Duplex Brasses.  These Alpha Beta Brasses are generally harder and stronger than other non-Alpha Beta Brasses.

As its name implies, Naval Brass was originally developed for sea water service applications.  Tin in included in the alloy composition in order to improve the corrosion resistance of Naval Brass.  The presence of lead in Naval Brass assists in the machinability of the metal.  C464 Naval Brass Rod has a fair machinability with about 35% of Free Machining Brass.

C46400 Naval Brass464 Naval Brass

 

The addition of Tin also gives Naval Brass a high resistance to dezincification.  Dezincification is a type of dealloying in which one of the constitutes of an alloy is removed by corrosion. Dezincification was first recognized as a serious problem in brass tubes used for ship condensers around 1920.  At the time this problem was referred to as “Condenseritis”.   Since then various alloys have been formulated to stop this process, one of which being Naval Brass.

Naval Brass is used extensively in marine hardware applications, but the uses don’t stop there.  Its higher tensile strength and resistance to wear make it applicable in bushings and wear strip as well as fastener and valve stem applications.

C464 Naval Brass

National Bronze Mfg. supplies C46400 Naval Brass in Round Rod, Plate, and Hex form.  Review the below specification chart to determine is C464 Naval Brass is right for your application.  Click Here to request a quote for C46400 Naval Brass Today.

C46400 Naval Brass Page

C464 Naval Brass

Manganese Bronze Performs Where Other Alloys Fail

If your application demands a bearing material able to withstand heavy loads, C86300 Manganese Bronze may be your alloy of choice.  Also known as SAE430B, or just 430B for short, C863 is tough and corrosion resistant. This alloy is ideal for low speed applications that require outstanding wear characteristics.  Keep in mind that this alloy requires reliable lubrication and is not heat-treatable.

Manganese Bronze

Manganese Bronze is made up of a Copper and Zinc blend, which technically makes it a brass.  The Manganese is added for strength and rust resistance.  While C86300 is called Manganese Bronze, there is very little Manganese in its composition – generally between 2.5% and 5%.  Even with that small of a percentage, the addition of Manganese yields outstanding results.  C863 boasts a tensile strength of 110 ksi and yield strength of 62 ksi, making this alloy ideal for high-strength bushings, large valve stems, gears, and wear rings. Manganese Bronze is utilized in a number of industries including Earth Moving Equipment, Wood Pulp Processing Equipment, Steel Mill Equipment, and Marine Applications.

Heavy DutyManganese Bronze Bushings

 

National Bronze Mfg. Co. offers raw bar stock in various shapes, as well as complete machined parts manufactured from Manganese Bronze.  Take a look below at the C86300 Specification Chart.  If you think this alloy is ideal for your application, Click Here to receive a detailed quotation from one of our experienced Sales Engineers.

C86300 SAE430B Manganese Bronze Page

C86300 Manganese Bronze

High Tin Bronze Alloys for Gear Applications

The Bronze Alloy of choice for worm gears is C90700 (SAE65) High Tin Bronze.  This has been the predominant bronze alloy for gear manufacturing throughout the 20th century, and continues to prevail today.  But what is it that makes C907 such a superior alloy for this application? To develop a clearer understanding of this trend, we should examine a specific group of bronze alloys known as the High Tin Bronze Alloy Family.

Bronze Gear

 

High Tin Bronze Alloys are typically found in gear and high-strength bushing and bearing applications – especially where high strengths, low speeds, and heavy loads are present.  This alloy family includes the following:

  • C90300
  • C90500
  • C90700
  • C90810
  • C91000
  • C91100
  • C91300
  • C91600
  • C91700

High Tin Bronze Alloys include those which contain at least 6% tin.  The addition of tin to these alloys is designed to strengthen the bronze.

You may be asking yourself: what makes C907 so special?  After all, there are other bronze alloys with greater strength.

In gear applications, bronze parts act as sacrificial components.  Generally you are dealing with a bronze-to-steel mating application, where the bronze component is sacrificed to protect the more valuable steel component.  In these cases, the steel surfaces must always be harder than the bronze surfaces.  This principal can also be seen in bronze sleeve bearing applications which are designed to protect a steel shaft.

Over the years, Metallurgists have developed specific alloys to minimize wear of the bronze part, while at the same time still providing the benefits of the steel-to-bronze application.  These alloys have the strength to withstand the high loads of these applications and also yield a low coefficient of friction against steel.

Bronze Gear

In addition to the High Tin Bronze Alloys, it is common to see Aluminum Bronze Alloys and Manganese Bronze Alloys used in a similar fashion.  All of these alloys, once worn in, develop a low friction deposit of bronze on the mating steel parts.

The deposits from the Tin Bronze Alloys are more beneficial than deposits from either the Aluminum Bronzes or Manganese Bronzes.  The Aluminum Bronze deposits will eventually trigger aluminum oxide content on the steel parts. Manganese Bronze deposits, on the other hand, contain both aluminum and zinc.  Zinc oxide is highly abrasive, and can promote galling when mated with steel.

This is what separates the High Tin Bronze Alloys, particularly C90700, from the other bronze alloys in this application.  In fact, the deposits of High Tin Bronze asperities on the mating steel part actually decrease wear and friction forces over time.

National Bronze Mfg. Co. has been supplying gear manufacturers with C90700 (SAE65) and other “Gear Bronze Alloys” for over 100 years.  These alloys include C954, C863, C903, C905, as well as the C907 alloy.

What separates National Bronze Mfg. Co. from other metal service centers is our technical expertise of the bronze alloys, as well as our full production capabilities.  While we are a leading distributor of bronze and other copper-based alloys, we have also been producing quality bronze parts through the production machining division of our company.

Gear Manufacturers have been taking advantage of our diverse product lines and capabilities in various ways.  An exceptionally beneficial component is our bronze gear blank product line.  We will machine various bronze alloys into slightly over sized blanks, allowing you to spend your time on the more complex machining processes associated with gears.  This not only frees up valuable machine time, but lowers material scrap and overall production costs.

bronze gear blank

Let us configure a specific combination of products and services to help make your company more efficient and competitive.  Follow the link below to contact an experienced Sales Engineer from National Bronze Mfg. Co. so we can start developing customized bronze gear solutions for you today.

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