Steel for wind power yaw gear ring and manufacturing method thereof

Abstract

The invention relates to steel for a wind power yaw gear ring and a preparation method thereof. The steel for the wind power yaw gear ring comprises the following components: 0.37-0.45 percent of C, 0.17-0.37 percent of Si, 0.60-0.90 percent of Mn, smaller than or equal to 0.015 percent of P, smaller than or equal to 0.005 percent of S, 0.90-1.20 percent of Cr, 0.20-0.30 percent of Mo, 0.30-0.80 percent of Ni, smaller than or equal to 0.20 percent of Cu, 0.015-0.040 percent of Alt, smaller than or equal to 0.005 percent of Ti, smaller than or equal to 0.020 percent of As, smaller than or equal to 0.020 percent of Sn, smaller than or equal to 0.0025 percent of Pb, smaller than or equal to 0.025 percent of Sb, smaller than or equal to 0.005 percent of Bi, smaller than or equal to 20 ppm of [O], smaller than or equal to 70 ppm of [N], smaller than or equal to 1.5 ppm of [H] and the balance of Fe and inevitable impurities. A prepared round billet is forged into the wind power yaw gear ring, the hardenability performance is stable and the low-temperature performance is good, the ultrasonic flaw detection result meets the standard requirement, and the use requirement under the marine environmental condition (60 DEG C below 0) at high-latitude extremely cold areas can be met.

Description

technical field [0001] The invention belongs to the technical field of alloy structural steel, and in particular relates to a steel for a wind power yaw ring gear and a manufacturing method thereof. Background technique [0002] In recent years, the development of wind power has continuously exceeded its expected development speed, and has maintained the fastest growing position in the development of new energy. By the end of 2011, the global cumulative installed wind power capacity reached 239GW (gigawatts), a year-on-year increase of 21.5%, meeting 3% of the world's electricity demand. In 2015, the newly installed wind power capacity in the world will reach 60.5GW, which will be a significant increase compared with 35.8GW in 2010. The main components of the wind turbine are tower, nacelle base, tower flange and door frame, wind turbine, main shaft, bearings, gears and blades, etc., the yaw and pitch system of the wind turbine, and the main components of the yaw system. T...

AI Technical Summary

Problems solved by technology

Although the steel can meet the workpiece requirements in the -40°C low temperature environment, the low temperature performance of the steel cannot safely meet the use requirements for the -60°C low temperature environment at sea in high latitude and extremely cold regions

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