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Manufacturing method of 500Mpa-grade cold-rolled magnetic steel

A manufacturing method and technology of magnetic pole steel, which are applied in the direction of manufacturing tools, temperature control, furnace type, etc., can solve the problem of inability to meet the safety requirements of hydraulic generators, improper selection of raw material slab components, and insufficient yield strength of cold-rolled magnetic pole steel. Advanced problems, to achieve uniform product performance, solve the effect of magnetic performance and strength, and small difference between head and tail performance

Active Publication Date: 2011-11-23
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The Chinese Invention Patent CN100419108C with the announcement date of September 17, 2008, the Chinese Invention Patent CN100392133C with the announcement date of June 4, 2008, and the Chinese Invention Patent CN100392134C with the announcement date of June 4, 2008 respectively disclosed 250MPa class , 350MPa grade and 450MPa grade cold-rolled magnetic pole steel production methods, due to the inappropriate selection of the components of the raw material slab, the yield strength of the produced cold-rolled magnetic pole steel is not high, the maximum is only 450MPa, which cannot meet the needs of hydroelectric power generation. machine use safety
Moreover, due to the bell annealing method, there are still many disadvantages such as long production cycle, low unit capacity, uneven magnetic properties, high energy consumption and large labor capacity.

Method used

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  • Manufacturing method of 500Mpa-grade cold-rolled magnetic steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) The slab corresponding to Table 1 is heated to 1260°C, and the heated slab is rough-rolled and finish-rolled by a 7-stand continuous rolling mill, and the slab is rolled into a thin steel plate of 2mm gauge. The final rolling temperature The temperature is 890℃, and then it is cooled to 600℃ by laminar cooling for coiling;

[0044] (2) Cooling by air cooling, and pickling when cooled to 80°C;

[0045] (3) Cold rolling, in which the cold rolling reduction rate is 45%;

[0046] (4) Continuous annealing step: the temperature of the soaking section of the annealing furnace is controlled at 740℃, the speed of the annealing process section is controlled at 120 m / min, and the soaking section time is controlled at 239s.

[0047] (5) Use 0.2% flattening elongation for flattening to produce 500MPa grade cold-rolled magnetic pole steel according to Example 1 of the present invention.

Embodiment 2

[0049] (1) The slab corresponding to Table 1 is heated to 1200°C, and the heated slab is rough-rolled and finish-rolled by a 7-stand tandem mill, and the slab is rolled into a 4mm thin steel plate. The final rolling temperature It is 830℃, and then it is cooled to 550℃ by laminar cooling method for coiling;

[0050] (2) Air cooling is adopted, and pickling is carried out when cooled to 60°C;

[0051] (3) Cold rolling, in which the cold rolling reduction rate is 55%;

[0052] (4) Continuous annealing step: the temperature of the soaking section of the annealing furnace is controlled at 760℃, the speed of the annealing process section is controlled at 125 m / min, and the soaking section time is controlled at 230s.

[0053] (5) Flattening is carried out with a flattening elongation of 0.8%, and the 500MPa grade cold-rolled magnetic pole steel of Example 2 of the present invention is made.

Embodiment 3

[0055] (1) The slab corresponding to Table 1 is heated to 1230°C, the heated slab is rough-rolled and finish-rolled by a 7-stand continuous rolling mill, and the slab is rolled into a 3mm thin steel plate. The final rolling temperature It is 860℃, and then it is cooled to 570℃ by laminar cooling method for coiling;

[0056] (2) Cooling by air cooling, and pickling when cooled to 70°C;

[0057] (3) Cold rolling, in which the cold rolling reduction rate is 52%;

[0058] (4) Continuous annealing step: the temperature of the soaking section of the annealing furnace is controlled at 755°C, the speed of the annealing process section is controlled at 122 m / min, and the soaking section time is controlled at 234s.

[0059] (5) Use 0.5% flattening elongation for flattening to produce 500MPa grade cold-rolled magnetic pole steel according to Example 3 of the present invention.

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Abstract

The invention discloses a manufacturing method of 500MPa-grade cold-rolled magnetic steel, which comprises the following steps that: (1) heating a slat to 1200 to 1260 DEG C, then rolling the slab into a steel sheet, the final rolling temperature is 830 to 890 DEG C, and adopting a laminar flow cooling way to cool the steel sheet to 550 to 600 DEG C to be rolled; (2) cooling the steel sheet in anair cooling way, and acid-washing the steel sheet; (3) cold rolling; (4) continuous annealing: the temperature of a uniformly-heated section of an annealing furnace is controlled within the range of 740 to 760 DEG C, the speed of the annealing process section is controlled at the range of 120 to 125 meter per minutes, and the time of the uniformly-heated section is controlled within the range of 230 to 239 s; (5) flattening. The cold-rolled magnetic steel produced with the method has high yield strength which can reach more than 570 MPa, uniform performance, small performance difference, favorable match between the magnetic sensing strength and the strength of the steel plate, favorable shape, high size precision, good surface quality and high yield.

Description

Technical field [0001] The invention relates to a method for manufacturing cold-rolled magnetic pole steel, in particular to a method for manufacturing cold-rolled magnetic pole steel with a yield strength greater than 500MPa. Background technique [0002] In order to solve the problem of energy shortage, all countries have increased investment in hydropower projects, and hydropower facilities under construction, expansion and reconstruction have increased significantly. In large hydropower units, the magnetic poles are the key components of the rotor body of the hydropower units. It can ensure the balance and stability of the unit's high-speed operation, and the demand for pole steel used in the rotor body of the generator unit has also increased significantly. [0003] The pole steel plate of the generator set rotor must have sufficient strength to meet the safety of the hydro-generator; in order to reduce the eddy current loss of the unit, the pole steel plate must have a better...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C38/12C21D8/12C21D1/26C21D9/52B21B37/74
Inventor 黄望芽甘青松陈浩刘飞张明
Owner BAOSHAN IRON & STEEL CO LTD
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