Cold Rolling of Magnetic Retardation Alloy Strips(GB/T14988-1994)
Cold rolling is one of the most important technology in the production of metal strip. GB/T14988-1994 is an general technical requirements for cold rolling of magnetic retardation alloy strips issued by the Ministry of Metallurgical Industry of People’s Republic of China. This paper presents an overview of the cold rolling of magnetic retardation alloy strips, with a particular focus on the requirements outlined in the standard of GB/T 14988-1994.
The magnetic retardation alloy strip refers to an metal strip that is produced by cold rolling of a strip of magnetic material that is rich in iron. This metal strip exhibits good magnetic retardation performance and can be used in fields like protection of magnet circuit, electric spark and insulation protection of high voltage electric spark. The metal strip also has good tensile strength and elongation as well as a certain degree of ductility and corrosion resistance. By cold rolling, the metal strip can be further improved with respect to these characters.
The cold rolling of magnetic retardation alloy strip is a complicated production process that involves a series of equal rolling, multiple rolling, spot welding and grinding, etc. According to GB/T 14988-1994, the production process should meet with the stricter technical requirements for alloys, mechanical properties and technology indexes of cold rolling. These requirements include the chemical contents of the alloy, mechanical properties such as yield strength, tensile strength, and elongation, as well as straightness and flatness of the metal strip.
The requirements for straightness of the metal strip states that the straightness deviation of the entire length of the metal strip should not be more than 8mm over 2000mm and the flatness of the metal strip should be not more than 4mm/m. It is also specified that the yield strength of the metal strip should be not worse than the minimum value of the guarantee product.
In addition to the above-mentioned requirements, the standard of GB/T 14988-1994 also outlines the other requirements for the cold rolling of magnetic retardation alloy strips. These includes requirements for the smoothness of the metal strip surface, the shape of the sheeting section and the width tolerance, etc. The tolerance of the width should not exceed ±0.3mm and the deviation of the sheeting section should meet with the requirements.
In conclusion, the cold rolling of magnetic retardation alloy strip is a complex production process. In order to ensure the quality of the metal strip, it is important to pay close attention to the requirements laid out by the GB/T 14988-1994. Strict adherence to the requirements will help the production process to produce high-quality metal stripes with excellent performance.
