1000MPa-grade high-toughness and high-magnetism hot-rolled magnetic yoke steel and production method thereof

Abstract

The invention discloses 1000MPa-grade high-toughness and high-magnetism hot-rolled magnetic yoke steel and a production method thereof. The 1000MPa-grade high-toughness and high-magnetism hot-rolled magnetic yoke steel is prepared from the following components in percentage by weight: 0.20 to 0.50 percent of C, 0.2 to 1.0 percent of Si, 0.5 to 1.5 percent of Mn, less than or equal to 0.015 percentof P, less than or equal to 0.005 percent of S, less than or equal to 0.06 percent of Ti, less than or equal to 0.05 percent of Nb, 0.20 to 1.0 percent of Mo, 0.20 to 1.20 percent of Cr, 0.20 to 0.60percent of Ni, 0.03 to 0.15 percent of V, 0.0005 to 0.003 percent of B, 0.015 to 0.10 percent of Al, less than or equal to 0.010 percent of N, less than or equal to 0.0080 percent of O, and the balance of Fe and other unavoidable impurities; and meanwhile Cr+Mo+Ni is larger than or equal to 0.80 percent; Nb+V+Ti is larger than or equal to 0.06 percent; carbon equivalent CEV is larger than or equal to 0.50 percent. The yield strength of the hot-rolled magnetic yoke steel is larger than or equal to 1000MPa, the tensile strength is larger than or equal to 1050MPa; the impact power KV<2> is larger than or equal to 40J at the temperature of 20 DEG C below zero; the magnetic induction performance B<50> is larger than or equal to 1.58T; B<100> is larger than or equal to 1.73T; B<200> is larger than or equal to 1.90T; and B<300> is larger than or equal to 1.93T. The 1000MPa-grade high-toughness and high-magnetism hot-rolled magnetic yoke steel meets relevant requirements of the hydropower industry on rotor magnetic yoke steel.

Description

technical field [0001] The invention relates to a steel for a generator rotor yoke and a production method thereof, in particular to a 1000MPa level high-toughness and high-magnetism hot-rolled yoke steel and a production method thereof. Background technique [0002] The rotor yoke is a key component of a hydro-generator, and the yoke of a large-scale hydro-generator is usually made of stacked steel plates. Reasonable selection of yoke material and manufacturing process is of great significance to ensure the installation quality and operation performance of the hydro-generator, and to effectively control the manufacturing cost of the hydro-generator. The performance requirements of the hydropower unit for the yoke steel plate mainly include high tensile properties: the yoke steel plate must bear huge centrifugal force and electromagnetic force. Excellent dimensional accuracy: The surface of the yoke steel plate should be smooth, flat, and uniform in thickness to ensure a hi...

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Problems solved by technology

[0009] Chinese patent application No. 201610867421.3 discloses "a CSP process to produce 1000MPa hot-rolled martensite and its production method". Although the tensile strength of the invented steel can reach more than 1000MPa, its yield strength is only 800MPa, and the invented steel The magnetic properties cannot meet the requirements of yoke steel for hydropower

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