Materials guide: How to choose the right metal for your specific application

Metals are fundamental materials of construction in industry, process, chemical and food technology. Each metal - and each alloy variant - has its own unique properties in terms of corrosion resistance, mechanical strength, temperature resistance and machinability. Therefore, the right choice of material is crucial to ensure reliability, longevity and functionality in demanding applications.

This guide provides an overview of some of the most common metallic materials, such as stainless steel, acid-resistant steel, aluminum and brass - and how their properties differ. These materials are used in environments where requirements can vary from high corrosion resistance to good weldability, light weight or excellent formability.

NB: This guide provides general guidelines for metal selection. The right choice of material always depends on your specific application and its requirements. Do not hesitate to contact us at Colly Flowtech for support - we are happy to help you find the most optimal solution for your processes.

What are the properties of 304/304L stainless steel?

Stainless steel 304/304L (SS 2333) is a versatile material with good corrosion resistance, especially to slightly acidic and slightly chloride environments.

The 304L variant contains lower carbon content, which improves weldability and minimizes the risk of grain boundary corrosion after welding.
In the food and pharmaceutical industries, 304L is often used in components where cleanliness and hygiene are important, such as SMS nuts, TC clamps, clamping sleeves and other fluid handling parts.

What are the properties of 316 stainless steel?

Acid-resistant steel 316 (SS 2343) offers very high corrosion resistance to salts, acids and more aggressive chemical environments than the 304 series can handle. The material also has good weldability without the need for subsequent heat treatment.

It is common in process environments such as the sulfite, cellulose and bleaching industries, where both chemical exposure and reliability place high demands on the material.

What are the properties of 316L acid-proof steel?

316L (SS 2348) is a low carbon variant of 316 and has the same excellent corrosion resistance, but with even better weldability and reduced risk of sensitization.

The material is particularly popular in the pharmaceutical and food industries, where it is used in pumps, piping systems and hose connections that require high purity, good resistance and long life.

What are the properties of aluminum?

Aluminum is a lightweight and malleable material with very good thermal and electrical conductivity. It also has good corrosion resistance in atmospheric environments thanks to its natural oxide film.Its low weight combined with ease of machining makes it suitable in applications such as pump parts, structural elements, pipework and clamping jaws.

What are the properties of brass?

Brass is an alloy of copper and zinc that is easy to both hot and cold form, depending on the zinc content. The material is durable, corrosion resistant and easy to machine, making it well-suited for components such as pump housings, coupling parts and plain bearings.

Thanks to its good mechanical and tribological properties, brass is widely used in both industrial and technical applications.