Trusted Oilless Bearings services

Trusted & reliable Bronze Oilless Parts services

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A manufacturing consultant and engineer, supplies a broad range of standard bronze oilless parts and self-lubricating bushing, wear plates for for dry applications

Types of Bronze Bearing Material & Specification:

SAE 660:

SAE 660 bronze or c932 / c93200 bearing bronze as known as high-leaded tin, this type of bronze is commonly used for bearings or Bushing widely applications in many industries.

SAE 841:

SAE 841 bronze is sintered bronze sleeve bearing or oil-impregnated bronze bearings and phosphor bronze bearings this type of bronze is designed for self-lubricating bushing.

SAE 863:

SAE 863 bronze is oil-impregnated bearings and mostly used for self-lubricating powdered metal bearing that is typically harder, higher strength

SAE 954:

954 Aluminum Bronze also called manganese bronze is the alloy that offers excellent performance in grooved bushing and bearings and more applications.

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Silicon bronze

Some other types of bronze for you to choose the best bronze for bearings or bushing, like silicon bronze is a metal alloy made from copper and silicon, with the addition of phosphorus. It is used in bearings because it has a very low coefficient of friction.

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Phosphor bronze

Phosphor bronze is also an alloy, but it has copper as its main metal. The copper in the molten alloy reacts with the phosphorus to form a layer on its surface. This layer prevents phosphor bronze from reacting with its environment, so it lasts longer than other types of alloys. Phosphor-bronze can also have additives that are not available for silicon bronze, which makes it more expensive than silicon bronze.

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Advantages Of Custom Bronze Bushings

Custom bronze bushings are one of the best options of bushings on the market. Buying custom bronze bushings is a wise investment, because the advantages of bronze as a material in bushing manufacturing are profound.

Made-To-Order Custom Bronze Bushing

Firstly, bronze is a very low-friction metal, which means the life of the bushing and the parts around it will naturally be longer. The reduced friction reduces the wear and increases efficiency, extending the life of the machine as a whole.

Secondly, bronze is extremely resistant to harmful environments. If your application involves materials like sand, dust, dirt, or other corrosive elements, bronze is one of the best materials you can choose to resist natural damage.

Thirdly, bronze requires less lubrication than other common materials, like steel, which means you will need to do less maintenance and supply less lubrication. Bronze can even be used to make self-lubricating bushings, which almost completely reduces the need to apply lubrication.

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For us, quality is service, fair price and high customer benefit. That is why we are of course also ISO certified: We define the quality of our service according to DIN EN ISO 9001 : 2015. Read here about the Viiplus corporate principles and the Viiplus quality promise.

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Bronze Bearing Design

Good bearing design involves three fundamental elements: understanding the service environment, designing for proper lubrication, and selecting the best bearing material for the job. Accurately assessing expected service conditions cannot be overemphasized; it is the basis for all subsequent decisions. Creating or at least identifying the lubrication mode in which the bearing will operate is equally important. Sometimes the mode can be established through design; other times it is simply dictated by operating conditions.

Finally, the bearing material selected must suit both the service environment and the operating mode. The wide array of properties offered by the bearing bronzes simplifies the material selection process and helps ensure that the alloy chosen will provide optimum bearing performance.

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We can custom make any order according to your own designs. For more information about pricing and delivery times, don’t hesitate to reach out to our dedicated sales team!

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Why use Bronze Bushings?

Bronze is a versatile and commonly used material for bushings because it comes in many alloys and compositions.

Bronze sleeve bushings or bronze bearings are hard and strong, as opposed to brass bushings, which are softer and more easily deform. Thus, bronze bushings have longer lifespans than brass bushing sleeves. They resist shock and impact, wear, and corrosion.

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Bronze Bushing Applications

They are more often used in low-speed, high-load and severe-duty industrial applications and machinery for iron and steel manufacturing, food processing, injection molding, automotive machines, earthmoving machinery, pumps, and other industries.

Two common bronze bushing materials and their uses include:

Oilite: Oil impregnated bronze bushings formed using powder metallurgy. Applications depend on the type of oil used and may accommodate high and low speed machinery, high and low temperature machinery, and food-grade applications.
Copper: Most often an alloy of bronze with tin, aluminum or silicon, these alloys have high corrosive resistance, making them ideal for marine applications.

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What Is Bronze?

Bronze is a copper alloy with Sn, Al, Be, Si, Mn, Cr, Cd, Zr, Ag, Fe, Mg, Te, etc. as the main alloy elements. It can be divided into two categories: processed bronze and cast bronze. According to the name of alloying elements, bronze can be subdivided into tin bronze, aluminum bronze, etc. In the sliding bearing, it is not only used as the main base material but also used as the anti-friction layer to cover the friction surface of the bearing.

flange sleeve bushing

Additional metal alloys that make up the bronze

Tin bronze

In addition to the main alloying elements, industrial tin bronze also contains a certain amount of P, Zn, Pb, Ni, etc. Tin bronze has strong corrosion resistance and wears resistance, and its mechanical properties and process properties are quite good.

1) In the liquid state, Sn is easy to form SnO with O, which is a hard and brittle compound. Therefore, due to sufficient deoxidation, the formation of SnO2 can reduce the mechanical properties of the alloy.
2) The tin bronze will produce serious dendrite segregation during solidification, and it must be homogenized annealing before pressure processing. However, due to the slow diffusion of Sn in Cu, this segregation can be completely eliminated after multiple homogenization annealing.
3) bronze is not sensitive to superheated gas and has good weldability
4) in bronze non-magnetic, no low-temperature brittleness, high wear resistance and corrosion resistance, no sparks when impacted.
Effects of alloying elements and impurities on the properties of tin bronze:
Pb and P in tin bronze may be either alloying elements or impurity elements, Zn is an alloying element, and Sb, Si, Al, S, Fe, Bi, etc. are impurity elements.

  • Influence of phosphorus: Phosphorus is an effective deoxidizer for copper alloys and improves the fluidity of tin bronze. The disadvantage is that it increases the reverse segregation of ingots. The phosphorus content of processed tin phosphor bronze is generally not more than 0.45% because when the phosphorus content is greater than 0.5%, a eutectic-peritectic reaction will occur at about 637 ° C, which is easy to cause hot embrittlement. When the phosphorus content of the alloy is greater than 0.3%, the eutectic composed of copper and copper phosphide (Cu3P) will appear in the structure. (For example QSn6.5-0.1 in GB/T 2040).
  • Influence of zinc: It is difficult to dissolve zinc in the α-phase solid solution of tin bronze. Therefore, the processing of Cu-Sn-Zn is a single-phase α solid solution, and Zn improves the fluidity of the alloy, narrows the crystallization temperature range, and reduces reverse segregation, but has no great influence on the structure and properties. The content of Zn in the processed tin bronze is generally not more than 5% (for example ZCuSn5Pb5Zn5 in GB/T 1176).
  • Influence of lead: The content of Pb in tin bronze does not exceed 5%. It is not a solid solution and α phase, exists in a free state, and is distributed among dendrites as black particles, but the distribution is uneven. As a soft phase, Pb can reduce the friction coefficient of tin bronze and improve the wear resistance (the wear-reducing layer of bimetallic bearings is generally made of the lead-containing tin bronze layer), and improve the machinability, but it will make the mechanical properties of the alloy. decline.
  • Influence of iron: Fe is an impurity of bronze, and its maximum content is 0.05%. It can refine grains, delay the process of recrystallization, and improve strength and hardness. However, the content should not exceed the limit value, otherwise too much iron-rich phase will be formed, which will reduce the corrosion resistance and process performance of the alloy.
  • Influence of manganese: Manganese and silicon are some of the harmful impurities in tin bronze, and their content should be strictly controlled, not more than 0.002%. Manganese is easily oxidized to form oxides, which reduces the melt fluidity of the alloy. After solidification, it is distributed on the grain boundary, weakening the intergranular bond and reducing its strength.

Chemical properties: Tin bronze is very stable in seawater and atmospheric environment, and its corrosion resistance to seawater is much stronger than that of copper and brass. Tin bronze containing 7%~9%Sn, 0.7%~1.3%Al, and 0.1%~0.2%Si can be used in polluted seawater. Sn can significantly improve the corrosion resistance of tin bronze, Ni also has an improved effect, but Pb has a negative effect.

Aluminum Bronze

The main alloying element of aluminum bronze is Al, which can be divided into simple aluminum bronze (both binary alloys) and complex aluminum bronzes (three or more alloys). Aluminum bronze is characterized by high mechanical properties, strong corrosion-resistance, and wear resistance. The aluminum content in aluminum bronze generally does not exceed 13%.

  • Influence of iron: A small amount of Fe can be a solid solution with the α solid solution of Cu-Al, if it is excessive, acicular FeAl3 will be formed, which will reduce the mechanical properties and corrosion resistance of the alloy. Therefore, the Fe content of the alloy should not exceed 5%. If the content of Ni, Mn, and Al in the alloy increases, the solubility of Fe in solid solution will be further reduced. (eg: ZCuAl10Fe3Mn2)
  • Influence of nickel: Ni can significantly improve the strength, hardness, thermal stability, and corrosion resistance of aluminum bronze. The Cu-Al-Ni-Fe alloy containing a certain amount of NI does not require additional solution treatment and quenching after hot working. immediate effect. The optimum content ratio of Ni to Fe is 0.9~1.1, such as ZCuAl8Mn13Fe3Ni2
  • Influence of manganese: Manganese has a very stable performance, aluminum bronze containing manganese has good processing and forming properties, and the cracking tendency of hot rolling can be significantly reduced.
  • Effects of Tin and Chromium: These two elements improve the resistance of alloys to stress corrosion cracking in steam and slightly acidic atmospheres.
    Chromium can improve the mechanical properties of binary alloys, inhibit the growth of grains in annealed alloys, and improve the hardness of annealed materials.
  • It should be noted that phosphorus, sulfur, arsenic, antimony, and bismuth are all harmful impurities in aluminum bronze, which will reduce the mechanical properties, process properties, and other properties of the alloy.

Lead Bronze

Lead bronze is based on Pb, Zn, and Sn as the basic alloy components, and the lead content is generally more than 8%. The composition of Pb in bronze can enhance the fatigue strength, thermal conductivity, and wear resistance of the body, as well as the excellent quality that cracks will not occur under the working conditions of impact load. The load-bearing performance of lead bronze is lower than that of aluminum bronze, but the wear reduction and fatigue resistance are much higher. It is generally used in high-speed applications.

  • Influence of zinc: The melting points of lead, zinc, and copper in bronze are quite different, so lead is not actually dissolved in the copper-tin alloy, and it is distributed among dendrites as single-phase black inclusions. Zn improves the fluidity of the alloy, narrows the crystallization temperature range, and reduces reverse segregation.
  • The effect of tin: Sn is very ductile at room temperature and its chemical properties are very stable. It can increase the heat dissipation performance of the product and make the product easy to process. The hardness of bronze containing Sn is also relatively high.

The additional metal alloys that make up the bronze impart beneficial characteristics to the resulting material.

Oil is infused into the alloy via powder metallurgy. Depending on its composition, SAE841 can accommodate a wide range of speeds and temperature ranges. It is often used in food-grade applications.
Aluminum, tin, and silicone. Marine manufacturers value the high corrosion resistance of copper but must alloy the copper with other materials to improve its strength. Copper alloyed with aluminum, tin, or silicone creates a bronze that enables manufacturers to create water-tight vessels without excessive weight.
Speak to your bearing provider for personalized bronze bushing guidance based on your specifications.

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