OREANDA-NEWS. November 07, 2012. WISCO provides high-quality products to equip with the important energy constructive projects in China. It was recently reported by WISCO that a famous large-scale Chinese motor plant ordered high-grade magnetic yoke steel to use in the hydraulic-turbine power unit with the world largest single-unit installed capacity—Xiangjiaba hydropower station with 800 thousand kilowatts giant hydraulic-turbine power unit, reported the press-centre of WISCO.  

Xiangjiaba hydropower station is the last plant of Jinsha River downstream cascade hydropower station which is developed by the Three Gorges Group headquarters. It is installed with four units of 800 thousands kilowatts on both banks and it is the third largest hydropower station in China as its total installed scale is only smaller than the Three Gorges and Xiluodu hydropower station. Its single-unit installed capacity is “top of the world”.

Magnetic yoke steel is an important part of the motor rotor and it can produce rotary inertia and hanging pole. Therefore its material should have high-strength and high-magnetic property and there is a high requirement for its surface quality and dimension accuracy. Journalist got the information from the relevant principal of the Hot Rolling Plant of WISCO that the magnetic yoke steel is the product to create the most profits in the hot-rolled products market, but customers have very strict requirement for its quality and dimension accuracy, and the single plate weight difference should be 20 grams for a grade after processing. Meanwhile, customers require the yoke steel internal stress should be as small as possible and the shape waviness should in the range of 3mm per meter to meet the requirement of laser cutting.

For years, the magnetic yoke steel used for the yoke of rotor in the hydraulic-turbine power unit has been mostly imported. Based on the independent innovation and making the technical breakthrough in terms of production process and quality control, Hot Rolling Plant of WISCO, through repeated trials, has explored laws of this steel grade during production. WISCO, therefore, is the first steel company in China which begun the R&D on magnetic yoke steel.

Currently, higher requirements have been put on the magnetic yoke steel in the construction of heavy duty water conservancy facility in China. Targeted on this market, WISCO developed the WDER750 magnetic yoke steel with the yield strength of 750 Mpa. WISCO is capable of producing a full range of grade and specification for magnetic yoke steel. It satisfied the requirements of China's electromechanical industry and boosted the nationalization of electromechanical steel.

According to the feedback of users, the magnetic yoke steel of WISCO has high magnetic induction, flat profile and high lamination factor. The overall quality has reached the level of or is even superior to the similar products introduced from abroad. Currently, the market share of high grade magnetic yoke steel of WISCO has reached 70% in the domestic heavy duty motor manufacturers. It is the priority to replace the imported magnetic yoke steel for users.