Hot rolled steel in C-Mn-Ti series with high intensity magnetic induction performance

Abstract

This invention relates to a method for producing C-Mn-Ti hot-rolled steel with high strength and high magnetic induction. This invention solves the problems of high cost and serious damage to rolling equipment faced by present techniques. The hot-rolled steel is composed of: C 0.03-0.15 wt.%, Si less than or equal to 0.15 wt.%, Mn 0.50-1.40 wt.%, P less than or equal to 0.025 wt.%, S less than or equal to 0.015 wt.%, Ti 0.05-0.15 wt.%, Al 0.02-0.10 wt.%, N less than or equal to 0.010 wt.%, and Fe. The method comprises: desulfurizing molten iron, smelting in a converter, treating by blowing Ar, casting into raw plates, heating the raw plates to 1230-1280 deg.C primarily hot-rolling (end temperature is greater than or equal to 1100 deg.C), then finely hot-rolling (end temperature is 850-930 deg.C), cooling, and curling at 580-650 deg.C to obtain hot-rolled and curled plates.

Description

technical field [0001] The invention relates to the field of micro-alloyed steel manufacturing, in particular to a steel with high strength (ReL≥600MPa) and high magnetic induction performance required by the rotor yoke of a large hydraulic generator and a manufacturing method thereof. Background technique [0002] With the increasingly prominent contradiction between power supply and demand, clean, pollution-free and renewable hydropower has become an important measure to solve energy problems in our country. With the deepening of my country's western development, a large number of large-scale and giant hydropower projects of the Three Gorges level will start construction in the next few decades. These large-scale and giant hydropower projects all require large-scale hydropower generation with a single-unit capacity of 700,000 to 800,000 kilowatts. The unit, which puts forward the requirements of high strength and high magnetic induction performance for the steel used in the...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of higher cost and greater damage to rolling and coiling equipment in the prior art, the present invention provides a yoke that can meet the requirements of the yoke in the rotor of a large hydroelectric generator with a high unit capacity. Yield strength ReL≥600MPa, magnetic induction performance B50≥1.5T C-Mn-Ti system high strength and high magnetic induction performance steel and its manufacturing method