Manufacturing method for high-magnetic induction low-cost 250 MPa cold-rolled magnetic pole steel

A manufacturing method and low-cost technology, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve the problems of further improvement of magnetic properties and high manufacturing costs, and achieve good quality control, low production costs, and improved cooling. The effect of rolling reduction

Active Publication Date: 2012-08-29
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent application number 200610019771.0 provides a production method for 250MPa grade cold-rolled magnetic pole steel. The manufacturing cost of the above-mentioned patent is relatively high, and bell furnace annealing is adopted, and its magnetic properties need to be further improved.

Method used

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  • Manufacturing method for high-magnetic induction low-cost 250 MPa cold-rolled magnetic pole steel
  • Manufacturing method for high-magnetic induction low-cost 250 MPa cold-rolled magnetic pole steel

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Embodiment Construction

[0036] Embodiments A-D of the manufacturing method of 250MPa grade cold-rolled magnetic pole steel of the present invention, the specific steps are:

[0037] 1) The slab is heated, the heating temperature is 1200-1260°C, and the heat preservation is about 1 hour.

[0038] 2) Hot rolling steps: the final rolling temperature is 850-900°C; the deformation is rolled in 7 passes, and the steel billet is finally rolled from 30mm into a thin steel plate with a size of 2-4mm. After rolling, it is cooled to 550-630°C by water cooling Do coiling.

[0039] 3) Cool the hot-rolled steel coil to 60-80°C for pickling.

[0040] 4) The step of cold rolling: the cold rolling reduction rate is 50-75%, and the thin steel plate of 1-2mm specification is cold rolled.

[0041] 5) Carry out continuous annealing at a temperature of 720-780° C. in a continuous annealing furnace.

[0042] 6) Use 0.8-1.4% leveling elongation for leveling to make 250MPa grade cold-rolled magnetic pole steel.

[0043] ...

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Abstract

The invention discloses a manufacturing method for high-magnetic induction low-cost 250 MPa cold-rolled magnetic pole steel. The manufacturing method comprises the steps as follows: heating a plate blank to be 1200-1260 DEG C and insulating; hotly rolling, wherein the final rolling temperature is 850-900 DEG C, the coiling temperature is 550-630 DEG C and a jet water cooling way is adopted as a cooling way; cooling to be 60-80 DEG C for acid washing, wherein an air cooling way is adopted as the cooling way; coldly rolling, wherein the cold rolling reduction rate is 50-75%; continuously annealing, wherein the temperature of an uniform heating section is 720-780 DEG C and the uniform heating time is 60-200 s; and flattening by a flattening elongation rate of 0.8-1.4% to prepare the 250 MPa cold-rolled magnetic pole steel. The produced magnetic pole steel has lower yield strength ReL of more than 250 MPa and magnetic induction strength B50 of more than 1.70 T, and is suitable for manufacturing a magnetic pole iron core of a rotor body of a large water-wheel generator.

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 of 250MPa. Background technique [0002] Hydropower is an important part of my country's electric energy. In recent years, hydropower facilities have increased significantly. The magnetic pole is a key component of the hydro-generator rotor, and the magnetic pole steel plate is the key material. Each large-scale hydro-generator has hundreds of magnetic poles. Tons of thin steel plates are stacked, and its weight accounts for about 1 / 10 of the total weight of the motor. In order to ensure the balance and stability of the high-speed operation of the unit, the magnetic poles are required to have high dimensional accuracy and sufficient strength. In order to reduce the eddy current loss of the unit, the magnetic pole steel plate Must have excellent magnetic induction. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C21D8/12B21B37/00
Inventor 张钦钊甘青松陈光林长青
Owner BAOSHAN IRON & STEEL CO LTD
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