Tin Bronzes

Tin bronze is a mixture of tin and copper. Typically, the tin ratio ranges between 10% and 20%, and the remaining portion is copper. The name of this alloy is derived from the bronze-like color that tin imparts. Bronzes containing 10-12% tin are considered ideal concerning mechanical properties.

• 5% tin, 95% copper tin bronzes
• 10% tin, 90% copper tin bronzes
• 15% tin, 85% copper tin bronzes

Copper-tin alloys with specific tin ratios fall within certain limits and constitute the most important bronzes industrially. Similar to brass, the addition of tin to copper forms a series of solid solutions.

Lead-containing tin bronzes contain up to 20% lead. They are preferred for the beds of untreated mills due to their low inherent hardness, causing minimal damage to the mill. Another characteristic is that in situations with minimal or no lubrication, the lubricating property of lead comes into play.

Tin bronzes are commonly preferred in cast parts. Cast bronzes contain tin, lead, phosphorus, and nickel. Tin bronzes with a hardness of 300 HB or lower, such as Cuptin 2, Cuptin 3, and Cuptin 4, are preferable for certain applications.

There are also zinc-containing varieties of lead-containing tin bronzes. Examples include Cuptin 1A and Cuptin 1B. Both alloys are suitable for use in low and high-speed mills.