KUROTANI

Established an integrated technology from the collection of
metal materials to manufacturing and
processing. Providing high-quality foundational materials
for various industries.

OUR BUSINESS

Manufacturing and Sales of Copper Alloy Ingots

Supply of ship propeller material,securing the top share domestically in the supply of ship propeller materials is a testament to our high technological capabilities.

The copper alloy ingot manufacturing business blends and melts copper recycling raw materials and copper alloy recycling raw materials collected from various countries worldwide and Japan. We then produce and sell products with shapes and weights tailored to the needs and applications of our various clients.

These copper alloy ingots find applications in a wide range of industries, serving as materials for ship propellers, faucets, valves, and various industrial machinery components.

For instance, our manufactured "Aluminum Bronze" is extensively used as the material for propellers (screws) in luxury cruise ships like "Asuka" and "Crystal Harmony" and ships navigating the world's oceans. Our share in this market is the largest globally.

While you may not directly manufacture the things you handle or see in your daily life, our technology plays a part in creating components of items that are close to you.

Advanced Analytical Technology and Robust Research Infrastructure

We strive for continuous improvement in quality and efficiency through our advanced analytical technology and well-established research system, ensuring that we can meet various customer demands. Meeting the diverse and ever-growing requests from our customers is our most crucial challenge, aiming to supply high-quality products at fair prices consistently.

The essential components for achieving this goal are advanced technology and continuous research and development, supported by excellent analytical capabilities. In our commitment to quality, we rigorously adhere to precise analysis based on the International Organization for Standardization's ISO9001 international standard. Additionally, we have set our own advanced in-house standards, prioritizing customer satisfaction in our pursuit of high-quality products.

We have also introduced cutting-edge analytical equipment, facilities, and quality management systems, actively engaging in efforts to enhance production efficiency and achieve even higher levels of quality.

Main Varieties

Aluminum Bronze Ingot

(Product Name: CACIn703, etc.)

Aluminum bronze is an alloy of copper with added aluminum, iron, nickel, and manganese. It boasts excellent strength, corrosion resistance, and is suitable for large castings, making it suitable for ship propellers, among other applications. While the term "bronze" originally refers to an alloy of copper and tin, in this context, "bronze" is used as a synonym for copper alloys in general.

Bronze Ingot

(Product Name: CACIn406, etc.)

Bronze refers to an alloy of copper and tin, with additional zinc, lead, etc., depending on the application. Bronze generally exhibits superior pressure resistance and corrosion resistance compared to copper and other non-ferrous metals. It is easily processed, making it widely used in applications such as residential and industrial valves, including stopcocks.

Lead-Free Bronze Ingot

(Product Name: CACIn902, etc.)

Lead-free bronze ingots have mechanical properties equivalent to bronze ingots, with almost no leaching of lead. They are used in applications such as water supply equipment and water facility appliances.

Brass Ingot

(Product Name: CACIn203, etc.)

Brass refers to an alloy of copper and zinc and is also known as yellow brass. The zinc content is typically 35-40%, but it may vary depending on the application. The alloy is versatile, possessing moderate strength, ductility, and workability. It finds use in a wide range of industrial applications and is also widely used in decorative items and art and craft products due to its beautiful golden luster.