C17200 copper strip and copper coil production process and product advantages:

1. Production process

Alloy smelting and casting

Using copper as the matrix, elements such as beryllium (1.8-2.15%), cobalt (0.35-0.65%), and nickel (0.2-0.25%) are added, and the composition uniformity is ensured by vacuum smelting. Subsequently, a semi-continuous casting process is used to form an ingot, and the cooling rate is controlled to avoid segregation.

Hot working forming

The ingot is initially formed by hot rolling, hot extrusion or forging. The hot working temperature needs to be precisely controlled (such as 930℃ softening temperature) to ensure the hot formability of the material. It is pointed out that adding trace amounts of cobalt can refine the grains and improve the properties of the alloy.

Cold working treatment

Further processing to the target thickness (0.01-3.0mm) through cold rolling, stamping, bending and other processes to meet the needs of ultra-thin strips. The material after cold working is in a semi-hard state (such as 1/2H), and the tensile strength can reach 630-920MPa.

Heat treatment strengthening

The key steps include:

Solution treatment: heating to about 800℃ and then cooling rapidly to make the alloy elements uniformly dissolved in the copper matrix.

Aging hardening: aging at 300-320℃ for 1.5-2 hours to precipitate the γ' strengthening phase, significantly improving the strength (tensile strength of 1260-1590MPa, hardness HRC39-45). Studies have shown that after aging, the grains of C17200 are finer, the density of the strengthening phase is higher, and the performance is better than that of the domestic QBe2.0 alloy.

Surface treatment and finishing

The oxide layer is removed by pickling, and the mirror effect is achieved by polishing process to meet the high-precision requirements of molds.

2. Product advantages

Excellent mechanical properties

High strength and high elasticity: After aging, the tensile strength can reach 1400MPa, the hardness HRC45, the elastic modulus 128GPa, and the fatigue limit is excellent. It is known as the "king of non-ferrous metal elasticity".

Wear resistance: The wear resistance is 7 times that of tin bronze, suitable for high-load friction parts such as copper sleeves and punches.

Excellent physical and chemical properties

Electrical and thermal conductivity: The electrical conductivity is 18-22% IACS, and the thermal conductivity is 105W/m·k (2-3 times higher than steel), which can quickly dissipate heat and shorten the injection molding cycle.

Corrosion resistance: It has excellent corrosion resistance in the atmosphere, fresh water and seawater, but it should be used with caution in ammonia and strong acid environments.

Non-magnetic and explosion-proof: Impact does not produce sparks, suitable for explosion-proof tools and sensitive electronic equipment.

Wide processing adaptability

Flexible molding: It supports a variety of processing methods such as hot extrusion, cold rolling, and spinning, and can be made into complex shapes.

Good welding performance: Compatible with brazing, laser welding, electron beam welding, etc., to meet high-demand welding scenarios such as aerospace.

Diversified application fields

Mold manufacturing: Used for injection molds and blow mold inserts, it has both high hardness and rapid cooling characteristics to extend mold life.

Electronics and electrical appliances: elastic components such as spring sheets, relays, connectors, etc., to ensure high reliability and long life.

Aerospace and military industry: used in navigation instruments, high-reliability connectors, and can withstand extreme environments.