1. Brass is a copper alloy with zinc as the main alloying element. According to the chemical composition, brass is divided into special brass and ordinary copper.

(1) Special brass

In order to obtain higher strength, corrosion resistance and good casting performance, aluminum, silicon, manganese, lead, tin and other elements are added to the copper-zinc alloy to form special brass. Such as lead brass, tin brass, aluminum brass, silicon brass, manganese brass, etc.

Lead brass has excellent cutting performance and good wear resistance, and is widely used in the manufacture of watch parts, and is cast to make bearing bushes and bushings; tin brass has good corrosion resistance and is widely used in the manufacture of sea-going ship parts; aluminum brass Aluminum can improve the strength and hardness of brass and improve its corrosion resistance in the atmosphere. Aluminum brass is used to manufacture corrosion-resistant parts; silicon in silicon brass can improve the mechanical properties, wear resistance and corrosion resistance of copper , Silicon brass is mainly used in the manufacture of sea-going ship parts and chemical machinery parts.

(2) Ordinary brass

Ordinary brass is a binary alloy of copper and zinc. Due to its good plasticity, it is suitable for manufacturing plates, rods, wires, pipes and deep-drawing parts, such as condensation pipes, heat dissipation pipes, mechanical and electrical parts, etc. Brass with an average copper content of 62% and 59% can also be cast, known as cast brass.

2. Bronze originally refers to copper-tin alloys, but it is customary in industry to call copper alloys containing aluminum, silicon, lead, beryllium, manganese, etc. also bronze, so bronze actually includes tin bronze, aluminum bronze, aluminum bronze, beryllium bronze, Silicon bronze, lead bronze, etc.

(1) Aluminum bronze

Copper-based alloys with aluminum as the main alloying element are called aluminum bronze. Aluminum bronze has higher mechanical properties than brass and tin bronze. Jinan Amico Valve tells you that the aluminum content of the aluminum bronze used in practice is between 5% and 12%, and the aluminum bronze with an aluminum content of 5% to 7% has good plasticity and is suitable for cold processing. When the aluminum content is greater than 7% to 8%, the strength increases, but the plasticity drops sharply, so it is mostly used in the cast state or after thermal processing.

The wear resistance of aluminum bronze and the corrosion resistance in the atmosphere, seawater, seawater carbonic acid and most organic acids are higher than those of brass and tin bronze. Aluminum bronze can be used to manufacture high-strength wear-resistant parts such as gears, bushings, and worm gears, as well as high-corrosion-resistant elastic elements.

(2) Tin bronze

Copper-based alloys with tin as the main alloying element are called tin bronze. Most tin bronzes used in industry have a tin content between 3% and 14%. Tin bronze with a tin content of less than 5% is suitable for cold processing; tin bronze with a tin content of 5% to 7% is suitable for hot processing; tin bronze with a tin content of more than 10% is suitable for casting.

Tin bronze is widely used in shipbuilding, chemical industry, machinery, instrumentation and other industries. It is mainly used to manufacture wear-resistant parts such as bearings and bushings, elastic components such as springs, and anti-corrosion and anti-magnetic parts.

(3) Beryllium bronze

The copper alloy with beryllium as the basic element is called beryllium bronze. The beryllium content of beryllium bronze is 1.7% to 2.5%. Beryllium bronze has high elasticity and fatigue, excellent wear resistance and corrosion resistance, good electrical and thermal conductivity, non-magnetic properties, and no sparks when impacted.

Beryllium bronze is mainly used to make important springs of instruments, clock gears, bearings and bushes working under high speed and high pressure, electrodes of electric welding machines, explosion-proof tools, nautical compass and other important parts.