01. Different properties:

Oriented silicon steel: Oriented silicon steel, also known as cold-rolled transformer steel, is an important ferrosilicon alloy used in the transformer (iron core) manufacturing industry.

Non oriented silicon steel: Non oriented silicon steel is a silicon iron alloy with very low carbon content, and its grains are irregularly oriented in the steel plate after deformation and annealing.

02. Different characteristics:

Oriented silicon steel: The magnetic properties of oriented silicon steel have strong directionality, with the lowest iron loss value, highest magnetic permeability, and high magnetic induction value in the rolling direction under a certain magnetization field. The silicon content of oriented silicon steel is about 3%, and it requires a low content of oxide inclusions in the steel, as well as the presence of certain inhibitors (MnS, A1N).

Non oriented silicon steel: Non oriented silicon steel is a silicon iron alloy with a silicon content of 0.8% -4.8%, which is hot and cold rolled into silicon steel sheets with a thickness of less than 1mm. Adding silicon can increase the resistivity and maximum magnetic permeability of iron, reduce coercivity, core loss (iron loss), and magnetic aging.

03. Different production processes:

Oriented silicon steel: The oriented silicon steel is melted in an oxygen converter, and the steel billet is hot-rolled, normalized, cold-rolled, annealed in the middle, and cold-rolled twice to form a finished thickness. Then, it undergoes decarburization annealing and high-temperature annealing, and finally coated with an insulation layer.

Non oriented silicon steel: hot metal pre desulfurization, secondary desulfurization by adding Ca0+CaF: flux or rare earth elements and calcium during converter blowing. Boiling molten steel is decarburized by vacuum treatment before further desulfurization. Select ferrosilicon with low titanium and zirconium content for alloying.

Cold-rolled silicon steel sheet: Grain oriented and non oriented steel strips.

Grain oriented cold rolled strips are commonly used as iron cores for motors or welding transformers; The grain oriented cold rolled strip is used as an iron core for power transformers, pulse transformers, and magnetic amplifiers. Cold rolled oriented thin silicon steel strip is made from 0.30 or 0.35mm thick oriented silicon steel strip, which is then pickled, cold rolled, and annealed.

Cold rolled non oriented silicon steel sheets are rolled into coils with a thickness of approximately 2.3mm from steel billets or continuous casting billets. Cold rolled electrical steel strip has the characteristics of flat surface, uniform thickness, high stacking coefficient, good punching performance, and higher magnetic induction and lower iron loss compared to hot rolled electrical steel strip.

Using cold strips instead of hot rolled strips to manufacture motors or transformers can reduce their weight and volume by 0% -25%. If cold-rolled oriented strip is used, the performance is better. Using it instead of hot-rolled strip or low-grade cold-rolled strip can reduce the electrical energy consumption of the transformer by 45% -50%, and the working performance of the transformer is more reliable.

Definition of non oriented silicon steel sheets:

Non oriented silicon steel sheet is a silicon steel sheet that forms a non oriented deformation texture crystalline structure according to a certain production process.

Oriented silicon steel sheet:

In the early 1920s, Williams conducted research on single crystals in ferrosilicon and found that um=140000 in the {100} direction of the easy magnetization axis. He believed that in multi grain plates, excellent performance should also be achieved in the {100} axis.

In 1926, Japanese scholar Bendo Mao discovered that the crystallization direction of iron is the most easily magnetized, or the direction of the grain cube edges is the most easily magnetized direction.

In 1934, N.P. Goss, an American, successfully developed oriented silicon steel sheets in a laboratory. He used a combination of cold rolling and high-temperature heat treatment to arrange the grains in the silicon steel sheets in an orderly manner along the rolling direction, possessing excellent magnetism.

In 1935, Goss published an article in TransAmer. Soc. Metals, introducing his research findings, and applied for a British patent (No. 442211).

In the same year, Armco Company in the United States began industrial production of cold-rolled oriented silicon steel sheets. In the 1940s, both Armco and Allegheny produced high-quality oriented silicon steel sheets for transformers. The brand name of Armco is Tran-cor (referred to as Hipersil by Westinghouse); Allegeny's brand is Silicon (referred to as Corosil by GE).

In 1953, Japan produced cold-rolled oriented silicon steel sheets.

In 1958, Japan introduced the patented technology of Armco Company and began the industrial production of cold-rolled oriented silicon steel sheets. Based on this, continuous improvement was made, bringing the performance of cold-rolled silicon steel sheets in Japan to the world's highest level.

Single oriented silicon steel sheets have low magnetic conductivity perpendicular to the rolling direction. To overcome this disadvantage, the German vacuum melting company invented double oriented silicon steel sheets in the 1940s.

In 1957, GE and Westinghouse in the United States almost simultaneously produced dual oriented silicon steel sheets, and in the 1960s, the Kawasaki and Yamagata factories in Japan also successfully developed dual oriented silicon steel sheets. Its magnetic properties in the rolling direction and vertical direction are similar to those in the rolling direction of single oriented silicon steel sheets. The grains of this silicon steel sheet exhibit a cubic structure. (ID of Steel Rolling House: zhangzhija)

In 1968, the Nippon Steel factory in Japan began industrial production of high magnetic density oriented silicon steel sheets. Its commercial name is "OrientcoreHi-B", abbreviated as "Hi-B"; In 1972, a large lattice high conductivity oriented silicon steel sheet was developed; In 1981, a small lattice high conductivity oriented silicon steel sheet was further developed; In 1982, Japan began producing high conductivity oriented silicon steel sheets treated with surface laser irradiation (ZDKH), further reducing iron loss.

In 1988, Japan developed a highly magnetic oriented silicon steel sheet using mechanical methods to form micro stress method (ADMH). The development of oriented silicon steel sheets by Nippon Steel Company in Japan. In the 1950s, several countries evaluated the performance of single oriented silicon steel sheets· The quality changes of oriented and non oriented silicon steel sheets in Japan between 1955 and 1975. The decline curve of iron core and steel sheet iron loss between 1880 and 1970.