How To Choose between Stainless Steel And Aluminium

Stainless steel & Aluminium 

When it comes to choosing between stainless steel and aluminum, there are several factors to consider. In this article, we will explore the key aspects that can help you make an informed decision.

Stainless steel characterstics

Aluminium characterstics

Stainless steel VS Aluminium

Comparison Items	Density	Strength	Corrosion Resistance	Thermal & Electrical Conductivity	Plasticity	Weight	Heat Resistance	Magnetism	Cost	Weldability
Stainless steel	High	High	Strong	Poor	Low	Heavy.	Moderate	Some have	High	Difficult.
Aluminium	Low	Low	Good	Good	high	Light.	Low	Not have	Low	difficult but achievable.

How to choose between stainless steel and aluminium in different scenarios

1. Architectural area

Building facade 

Stainless steel case:

in the facade of some large commercial buildings or landmarks, such as the Chrysler Building in New York. Its spire part is made of stainless steel for decoration and protection of the building structure. The high strength and corrosion resistance of stainless steel can resist the erosion of wind and rain, ultraviolet rays and atmospheric pollution, while its bright surface can reflect the sunlight and produce dazzling visual effects, enhancing the overall aesthetics of the building. Moreover, the hardness of stainless steel can ensure that the decorative part of the facade will not be easily deformed under long-term wind and sunshine.

Aluminium case:

For some buildings pursuing modern minimalist style, such as some new science and technology park buildings. The facade is made of anodized aluminium panels. This material can be anodized to obtain rich colours, such as silver grey, champagne, etc., which can blend with the surrounding environment. Moreover, the low density of aluminium makes the installation process more convenient and reduces the overall weight of the building, requiring relatively low loads on the building structure.

Structural supports for buildings

Stainless steel case:

in the seaside trestle or offshore oil platform support structure, due to the long-term in the high humidity, high salinity of the marine environment, need to resist the corrosion of sea water and the impact of the waves. 316L stainless steel (a kind of stainless steel resistant to sea water corrosion) is the ideal choice. It contains molybdenum, which enhances corrosion resistance in chloride-containing environments, ensuring the structural safety of the trestle or platform for decades.

Aluminium case:

In some lightweight building structures, such as the frame structures of temporary exhibition venues, aluminium alloy frames are used in order to facilitate rapid erection and dismantling, and to take into account the flexible division of space inside the venues. Aluminium alloy frames can be made into various shapes of profiles through the extrusion process, which are easy to assemble and lightweight, making it easy for transportation and on-site construction.

2. Industrial manufacturing areas

Mechanical Processing

Stainless steel case:

in food processing machinery, such as meat cutting equipment. Since the equipment requires frequent contact with meat, grease and water, and to meet food hygiene standards, 304 stainless steel is a commonly used material. It has good corrosion resistance and will not be corroded by acidic or alkaline components in food, while the smooth surface is easy to clean and can prevent bacterial growth. And stainless steel is strong enough to withstand the mechanical stresses of the cutting process.

Aluminium Case:

The high thermal conductivity of aluminium plays a key role in the manufacture of computer CPU coolers. The heat sink conducts the heat generated by the CPU quickly through aluminium's good thermal conductivity, and then radiates it into the air through the cooling fins. Moreover, the low density of aluminium makes the overall weight of the heat sink lighter and does not put excessive pressure on the CPU, while making it easy to install and remove.

Chemical Equipment

Stainless steel case:

In the chlor-alkali industry, duplex stainless steel (e.g. 2205 stainless steel) is usually used in reactors for the production of chlorine and caustic soda. Because the reaction process will produce a large number of corrosive media containing chloride ions, duplex stainless steel in the austenite and ferrite two-phase organisation synergistically, so that it has excellent resistance to chloride ion stress corrosion cracking performance, can ensure that the reaction kettle in harsh chemical environments in the long term stable operation.

Aluminium case:

In some storage tanks for the production of organic chemicals (such as ethanol, ethyl acetate, etc.), aluminium alloy is used to make storage tanks due to the relatively weak corrosiveness of these chemicals to aluminium and in consideration of the lower cost of aluminium and easy processing and forming. Aluminium alloy storage tanks can be made into various sizes by rolling or welding processes to meet different storage needs.

3. Daily necessities field

Kitchenware

Stainless steel case:

Stainless steel knives are common tools in the kitchen. For example, the stainless steel knives of the German brand Dual Lifestyle are made of high-carbon stainless steel, which undergoes a precision forging and heat treatment process to give them a very high degree of hardness and sharpness. The knives are able to keep their edges sharp during use and resist corrosion from salt and acid in food as well as water vapour in the kitchen environment for a long service life.

Aluminium cases:

In some bakeware, such as aluminium baking trays. The good thermal conductivity of aluminium enables the baking tray to heat up quickly and evenly in the oven, ensuring that the food is baked. Moreover, aluminium baking trays are relatively light, easy to handle and affordable.

Electronics

Stainless steel cases:

Stainless steel is used in the centre frame part of some high-end smartphones. For example, stainless steel is used in the centre frame of some Apple iPhone models. The high strength of stainless steel can protect the electronic components inside the mobile phone from external impacts, while its metallic texture and luster enhance the appearance of the mobile phone. And the electromagnetic shielding performance of stainless steel also helps to reduce the impact of external electromagnetic interference on mobile phone signals.

Aluminium Cases:

Aluminium materials are widely used in the manufacture of tablet PC cases. For example, most of the iPad's cases are made of aluminium alloy, whose lightweight feature makes the tablet PC easy to carry, and at the same time, through anodic oxidation and other surface treatment processes, the cases can be made with different colours and textures to meet consumers' demand for personalization.