Red copper: refers to pure copper, the main varieties are oxygen-free copper, red copper, phosphorus deoxidized copper, and silver copper. Brass: refers to an alloy based on copper and zinc, which can be subdivided into simple brass and complex brass. In complex brass, the third component is named nickel brass, silicon brass, etc. Bronze: refers to copper-based alloys other than copper-nickel and copper-zinc alloys. The main varieties are tin bronze, aluminum bronze, and special bronze. Cupronickel: refers to a copper-nickel alloy.
The standardization of copper and copper alloys in my country is progressing rapidly. The national standards related to copper are divided into four categories. One is the basic standard, of which GB5231-2001 specifies the chemical composition and product shape of processed copper and copper alloys; the other is the chemical analysis method standard. The chemical analysis methods for the main components and impurity elements in copper and alloys are specified; the third is the physical and chemical performance test methods, including electrical resistivity, ultrasonic testing, eddy current testing, residual stress, dezincification corrosion, oxygen content of oxygen-free copper, fracture , Grain size and other prescribed methods; fourth is product standards, including copper cathode, copper wire ingots for electrical engineering, cast brass ingots, cast bronze ingots, blister copper, copper sulfate, copper beryllium master alloy, copper master alloy, copper fine Standards for ore and copper and alloy processing materials.
In addition to national standards, my country also has industry standards and corporate standards. In order to meet the needs of product development, both the supplier and the demander can also negotiate special technical conditions. Copper and copper alloy products from all over the world are included in national standards, such as American ASTM standards, Japanese JIS standards, British BS standards, German DIN standards, French NF standards, Russian ΓOCT standards, international standards ISO, EU BSEN standards, etc. Standardization work is extremely important to the development of the national economy, and it is also a summary of copper production, research, and application. Therefore, copper and copper alloy standards around the world are constantly being revised and improved.
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