· Aluminum is lightweight, strong, and easy to process, making it suitable for various applications such as aerospace and automotive parts. Its corrosion resistance also enhances its appeal in outdoor projects and structural components.

· Copper has high conductivity and malleability, making it the preferred choice for wires and pipes. Its natural antibacterial properties make it ideal for medical applications, while its aesthetic qualities suit decorative items and artworks.

· Bronze is an alloy of copper and tin, known for its durability and corrosion resistance. Its high strength and ability to withstand harsh environments make it widely used in marine applications, sculptures, and bearings.

· Steel is a strong and versatile material used extensively in construction and manufacturing. Its high tensile strength makes it suitable for structural components, and various subtypes enhance its performance for specific applications like tools and machinery.

· Stainless steel is ideal for kitchenware and medical devices due to its rust and stain resistance. Its strength and aesthetic appeal also make it a popular choice in architectural design and automotive parts.

· Magnesium is lightweight yet strong, commonly used in aerospace and automotive sectors where weight reduction is crucial. Its machinability allows for complex shapes, and it is also used in various electronic devices due to its excellent conductivity.

· Titanium is a strong and lightweight metal, ideal for aerospace and medical implants. Its corrosion resistance and biocompatibility make it promising for harsh environments, and its high strength-to-weight ratio suits various industrial applications.

· Tool steel is a high-hardness, wear-resistant, and high-heat-strength alloy steel specially used for manufacturing tools. It is widely applied in molds, cutting tools, stamping dies, and precision mechanical parts. Tool steel can be categorized into cold work, hot work, and high-speed tool steels based on its application.

· Alloy steel is made by adding one or more alloying elements (such as chromium, nickel, molybdenum) to carbon steel to enhance its strength, toughness, wear resistance, and corrosion resistance. It is widely used in structural components, machinery parts, gears, and high-strength bolts, suitable for high loads and harsh environments.