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Production method of 250 MPa grade cold rolled magnetic pole steel

A production method and magnetic pole steel technology, which is applied in the field of cold-rolled magnetic pole steel, can solve the problem of unreasonable coordination of cold-rolled magnetic pole steel plate strength and magnetic induction intensity, strict requirements for rolling equipment and process control, and unsatisfactory comprehensive quality of cold-rolled magnetic pole steel and other problems, to achieve excellent comprehensive performance, good coordination, and solve the effects of magnetic properties and strength

Inactive Publication Date: 2007-01-31
WUHAN IRON & STEEL (GROUP) CORP
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Problems solved by technology

The production methods (including composition and process) of the cold-rolled magnetic pole steel disclosed in these articles have the following deficiencies: 1. The steel plate strength and magnetic induction intensity of the cold-rolled magnetic pole steel are unreasonable, and the overall quality of the cold-rolled magnetic pole steel is not ideal; 2. Strict requirements for rolling equipment and process control, high production costs

Method used

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Embodiment Construction

[0034] The production method of the steel of the present invention mainly includes several stages such as hot rolling, cold rolling and annealing.

[0035] Embodiment 1-4 of the production method of 250MPa grade cold-rolled magnetic pole steel of the present invention, the specific steps are:

[0036] (1) The slab is heated before hot rolling, the heating temperature is 1160-1230°C, and the heating and holding time is 1 hour.

[0037] (2) The step of hot rolling; the starting rolling temperature is 1050-1100°C, and the final rolling temperature is 840-880°C; the deformation process is 7 passes, and the deformation time interval of each pass is less than 0.3s, and the final billet thickness is rolled from 30mm Thin steel plates with specifications of 2.5-4.5mm are rolled and cooled to 640-700°C by jet-type, uniform and moderate water cooling after rolling.

[0038] (3) Air-cooling is used for cooling, and pickling is carried out when the hot-rolled steel coil is cooled below 7...

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Abstract

This invention relates to a process of producing 250MPa cold rolled steel magnet. It includes steps as follows: (1)to heat plate body to 1160-1230DEG C;(2)hot rolling steps: the start rolling temperature 1050-1100DEG C,end rolling temperature 840-880DEG C,cooling to 640-700DEG C for coiling. (3)cooling to 70DEG C below for acid picking. (4)cold rolling steps; (5) bell furnace anneal; controlling temperature 660-680DEG C (6) temper rolling, then the products. Account to weight the main chemical composition is: C 0.03-0.09%,Si 0.10-0.30%,Mn 0.30-0.70%,Nb 0.015-0.025 %,Als 0.01-0.07%,P <=0.025%,S <=0.010%, Fe the rest.

Description

technical field [0001] The invention relates to a cold-rolled magnetic pole steel, especially a production method of a cold-rolled magnetic pole steel with a yield strength of 250MPa. Background technique [0002] In order to solve the problem of energy shortage in our country, the country has increased investment in hydropower projects, and the number of hydropower facilities under construction, expansion and reconstruction has increased significantly. Among the special key new materials for large hydropower units, the magnetic pole steel plates used in the rotors of generator sets Demand has also increased significantly. [0003] The magnetic pole steel plate of the rotor of the generator set must have sufficient strength to meet the safety of the hydro-generator; in order to reduce the eddy current loss of the unit, the magnetic pole steel plate must have better magnetic flux than the yoke steel plate; the magnetic pole is made of laminated steel plates, In order to ensu...

Claims

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Application Information

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IPC IPC(8): C22C38/12C21D8/12C21D11/00B21B37/00
Inventor 孙方义刘浩刘家宁钟定忠胡吟萍欧阳金明余晓静饶克伟白春雷柳志敏黎静
Owner WUHAN IRON & STEEL (GROUP) CORP
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