Czy cena za kilogram materiału to faktyczny koszt Twojego detalu? Mosiądz w przemyśle samochodowym

Its popularity in the automotive market comes from an excellent combination of properties: good machinability, corrosion resistance, adequate mechanical strength, and the ability to produce precise surfaces, threads, and seats for seals. However, in series production, functionality of the finished part isn't the only thing that matters. Equally important from a business standpoint is how the material behaves during machining and what the real cost is of producing one compliant part.

A Cheap Material Can Mean an Expensive Process

In high-volume production, even small differences in the machining time of a single part can significantly affect total cost. That's why a profitability analysis shouldn't stop at the price of a bar or forging. Just as much — sometimes more — the financial outcome is shaped by:

• cycle time

• tool life and replacement frequency

• process stability

• chip formation and evacuation

• surface quality achieved

• amount of material removed during machining

• number of technological operations required

In practice, this means a material that costs more to buy can end up being the better choice if it shortens cycle time or reduces production problems. This is exactly why one of the best evaluation criteria isn't the price per kilogram of material, but the total cost of producing one compliant part.

CuZn40Pb2: Performance Hidden in a Stable Material

One of the most widely used brass alloys for automotive components is CuZn40Pb2 (CW617N). Its major advantage is the combination of very good machinability with good hot-forging workability. Thanks to these properties, the material can be used both as bar stock and as forgings for further CNC machining.

From a process-engineering standpoint, the lead content is key during cutting. It promotes the formation of short, brittle chips that are much easier to evacuate from the cutting zone. In an automated environment, this matters enormously, since any chip-related issues can lead to machine stoppages, tool damage, or a significant deterioration in surface quality.

This alloy performs excellently in turning, drilling, thread-making, and machining surfaces intended for sealing elements. It is used to manufacture parts such as:

• pneumatic fitting bodies

• elbows and tees

• connectors and couplings

• sleeves and nuts

• threaded components

• seats and surfaces mating with O-ring seals

For parts with more complex geometry, the ability to use forgings is a major technological advantage. Parts like elbows or tees can first be shaped by forging and then machined only where high precision is absolutely required. This is an excellent example of optimization — it directly reduces the amount of material removed, shortens machining time, and improves the efficiency of the entire process.

New Challenges: How to Implement Lead-Free Brass

Changing regulations mean that, alongside classic leaded alloys, lead-free brasses are becoming increasingly important. A prime example is silicon brass CuZn21Si3P (CW724R). Although it's used on a smaller scale compared to CuZn40Pb2, its importance is steadily growing in applications where lead content must be reduced or eliminated entirely.

Many manufacturers overlook one thing, however: switching from a leaded to a lead-free brass isn't just a matter of changing the grade on technical documentation. The complete absence of lead directly affects how the material behaves during machining. Compared to CuZn40Pb2, chip control and breaking can be considerably more difficult. What does this mean for a plant? Tool geometry, cutting parameters, feed rate, cooling, and chip evacuation all become significantly more important.

For this reason, implementing a lead-free material often requires a thorough re-optimization of the machining process. This doesn't mean the lead-free material is worse — it's simply different technologically, and should always be evaluated both for the properties of the finished product and for its impact on the entire production process.

Value for the End Customer

Machinability has a major impact on optimization at the manufacturer's end, but from the end user's perspective, functionality of the part remains paramount. For components used in pneumatic systems, sealing performance, corrosion resistance, mechanical strength, and dimensional stability are critical.

Precise machining of surfaces for O-rings, threads, and sealing seats directly affects the long-term reliability of such a connection. The finished part must retain all of its properties over years of service, continuously withstanding temperature fluctuations, vibration, moisture, and the many other stresses found in the demanding automotive environment.

The Optimal Compromise at the Heart of Production

There's no single ideal brass grade — the optimal material always depends on the specific application. CuZn40Pb2 remains an excellent solution wherever high machining performance, effective chip control, and the flexibility of using both bars and forgings are paramount. Lead-free alloys, such as CuZn21Si3P, are becoming an increasingly important alternative each year wherever lead-content reduction is dictated by hard material or environmental requirements.

In engineering practice, choosing the right alloy is always a compromise — balancing machinability, mechanical properties, functionality of the finished part, customer requirements, and total production process cost. This balanced combination of properties is what keeps brass one of the fundamental materials used to manufacture precision components for the automotive industry.

Jako Production Manager w naszej firmie, Piotr Szymonowicz wnosi imponujące doświadczenie w zarządzaniu procesami produkcyjnymi oraz zespołami technicznymi. Jego historia w MB Pneumatyka to dowód na to, że prawdziwi specjaliści nieustannie szukają przestrzeni do rozwoju – swoją karierę u nas zaczynał jeszcze w czasach studenckich, przechodząc drogę od praktykanta do starszego technologa. Doskonale zna trzon i technologie naszej firmy, a jego codzienna praca obejmuje dziś kompleksowe zarządzanie produkcją w obliczu jej rosnącej skali oraz dbanie o najwyższe standardy jakości.