How to fill in the composition table of silicon steel sheet, and what is the national standard for t

Silicon steel Silicon steel is a ferrosilicon alloy with a silicon content of about 3 and other mainly iron. It is an indispensable and important soft magnetic alloy for the electrical, electronic and military industries, and is also the most produced metal functional material, mainly used as the core of various motors, generators and transformers. Its production process is complex, the manufacturing technology is strict, and the foreign production technology is protected in the form of patents, which is regarded as the life of the enterprise.

The manufacturing technology and product quality of electrical steel plate is one of the important indicators to measure the level of special steel production and scientific and technological development of a country.

At present, the quantity, quality, specifications and grades of cold-rolled electrical steel in China cannot meet the needs of the development of energy (electric power) industry, and there is a large gap between Japan in terms of production technology, equipment, management and scientific research.

Silicon steel classification: hot-rolled silicon steel sheet:

Hot-rolled silicon steel sheet is made by melting fe-Si alloy with an open-hearth furnace or electric furnace, repeatedly hot rolling into thin plates, and finally annealing at 800-850. Hot-rolled silicon steel sheet is mainly used in the manufacture of generators, so it is also known as hot-rolled motor silicon steel sheet, but its utilization rate is low, energy loss is large, and the relevant departments have forced it to be eliminated in recent years.

Cold-rolled non-oriented silicon steel sheet:

The main use of cold-rolled non-oriented silicon steel sheet is for generator manufacturing, so it is also known as cold-rolled motor silicon steel. Its silicon content is cold-rolled to the thickness of the finished product, and the ** state is mostly thick steel strip. The BS of cold-rolled non-oriented silicon steel is higher than that of oriented silicon steel; Compared with hot-rolled silicon steel, its thickness is uniform, the dimensional accuracy is high, and the surface is smooth and flat, which improves the filling coefficient and the magnetic properties of the material.

Cold Rolled Oriented Silicon Steel Sheet:

The main use of cold-rolled oriented silicon steel strip is for transformer manufacturing, so it is also called cold-rolled transformer silicon steel. Compared with cold-rolled non-oriented silicon steel, the magnetic properties of oriented silicon steel have strong directionality; It has superior high permeability and low loss characteristics in the rolling direction of easy magnetization. The iron loss of the oriented steel strip in the rolling direction is only 1 3 transversely, and the ratio of permeability is 6:

1, its iron loss is about 1 2 of the hot-rolled strip, and the permeability is a multiple of the latter.

High magnetic inductance cold-rolled oriented silicon steel sheet:

High magnetic inductance cold-rolled silicon steel strips are all single-oriented steel strips, which are mainly used in the manufacture of various transformers, chokes and other electromagnetic components in the telecommunications and instrument industries. There are two main characteristics of its application, one is that under the condition of small current, that is, weak magnetic field, the material is required to have high magnetic properties in the weak magnetic field range, that is, high 0 value and high b value; The second feature is the high frequency of use, usually above 400Hz, or even up to 2MHz. In order to reduce eddy current losses and effective permeability under alternating magnetic fields, thin bands are generally used.

Silicon (Si), manganese (Mn), carbon (C), phosphorus (P), sulfur (S) and, of course, most importantly, iron (Fe).

Silicon (Si), manganese (Mn), carbon (C), phosphorus (P), sulfur (S) and, of course, most importantly, iron (Fe).

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According to its different silicon content, silicon steel sheet can be divided into two types: low reed bond silicon and high silicon. The low silicon wafer contains less than silicon, it has a certain mechanical strength, and is mainly used to manufacture motors, commonly known as motor silicon steel sheets; The high silicon content of silicon wafers is that it has good magnetic properties but is brittle, and is mainly used to manufacture transformer cores, commonly known as transformer silicon steel sheets.

They all have a carbon content between wc.

The specified nominal thickness, whether hot-rolled or cold-rolled silicon steel sheets usually haveThere are four kinds of 65mm, and there are special requirements00mm and other specifications.

Silicon steel sheet (belt) is generally used as the ultimate finished product, which only involves physical properties, and does not do chemical test and teasing test, except for special circumstances.

At first glance, this is a newcomer who has just come into contact with silicon steel, and the grade of silicon steel is not distinguished by chemical composition, in other words, you can also produce different grades of products with the same chemical composition of molten steel. Silicon steel grades are divided according to the characteristics required by the electrical industry, such as magnetic loss, iron loss, etc.

Chinese Representation Method:

1) Cold-rolled non-oriented silicon steel strip (sheet).

Representation: DW + iron loss value (iron loss value per unit weight when the frequency is 50Hz and the magnetic inductance peak value of the waveform is sinusoidal.) ) 100 times + 100 times the thickness value.

For example, DW470-50 indicates that the iron loss value is cold-rolled non-oriented silicon steel with a thickness of 50W470.

2) Cold-rolled oriented silicon steel strip (sheet).

Representation: DQ + iron loss value (iron loss value per unit weight at a frequency of 50Hz and a sinusoidal waveform with a magnetic inductance peak.) ) 100 times + 100 times the thickness value.

Sometimes adding g after the iron loss value indicates high magnetic inductance. For example, DQ133-30 indicates that the iron loss value is cold-rolled oriented silicon steel strip (sheet) with a thickness of 30Q133.

3) Hot rolled silicon steel plate.

Hot-rolled silicon steel plate is represented by DR, which is divided into low silicon steel (silicon content) and high silicon steel (silicon content) according to the amount of silicon content.

Expression: 100 times the DR + iron loss value (the iron loss value per unit weight when the maximum value of the magnetic induction intensity is repeated at 50 Hz and changed in a sinusoidal shape) + 100 times the thickness value. For example, DR510-50 represents a hot-rolled silicon steel plate with an iron loss value and a thickness of .

The grade of hot-rolled silicon steel sheet for household appliances is expressed by JDR + iron loss value + thickness value, such as JDR540-50.

Other notations:

1.Oriented American M-4, M-5, M-6 UK 28M4, 30M5, 30M6 Japan 27Z130(Z9), 30Z140(Z10), 35Z155(Z11) China Q09(,Q09(,Q10(

2.Non-oriented type US M-15, M-19, M-22, M-36 UK G250, G265, G315, G335 Japan H9, H10, H12, H14 China W09, W10, W12, W14

3.In addition to the distinction of the above two specifications, there is also the distinction between A (stewed) and N (not stewed), and there are also black and white slices.

4.Thickness oriented type, non-oriented type 29ga), 26ga) silicon steel sheet, also known as electrical steel plate, is the most widely used and largest amount of soft magnetic material in the power and electronics industry. It has a high magnetic induction value (BS=about 2T), low iron loss, no precious elements, **low, and many performance grades.

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