STEEL FOR WIND TURBINE MAIN SHAFT BEARING AND PRODUCTION METHOD THEREFOR

WIPO Patent Application WO/2020/073576

A1

Steel for a wind turbine main shaft bearing and a production method therefor. The steel comprises the following chemical compositions: C: 0.10-0.30%; Si: 0.10-0.50%; Mn: 0.30-0.80%; Cr: 1.30-1.60%: S: less than or equal to 0.025%; P: less than or equal to 0.025%; Ni: 3.25-3.75%; Cu: less than or equal to 0.30%; Mo: 0.15-0.25%; Al: 0.005-0.05%; N: 0.005-0.015%; Ca: less than or equal to 0.0010%; Ti: less than or equal to 0.003%; O: less than or equal to 0.0015%; As: less than or equal to 0.04%; Sn: less than or equal to 0.03%; Sb: less than or equal to 0.005%; Pb: less than or equal to 0.002%; and the balance of Fe and inevitable impurities. The production method comprises liquid steel smelting, large cross-section continuously casting large billets using a CCM, continuous rolling and finishing, and slow cooling and softening annealing the continuously casting billets. Steel is high in purity, shows tissue uniformity and compact density, can replace electroslag steel, and meets the requirements of steel for wind turbine main shaft bearings.

CHEN MIN (CN)
LI FENG (CN)
XU XIAOHONG (CN)
GENG KE (CN)
BAI YUN (CN)
HUANG ZHEN (CN)
YIN QING (CN)
ZHAI JIAOLONG (CN)

PCT/CN2019/075851

April 16, 2020

February 22, 2019

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JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD (CN)

C21D1/32; C21D8/06; C22C38/02; C22C38/04; C22C38/06; C22C38/42; C22C38/44; C22C38/50; C22C38/60

US20150023626A1	2015-01-22
US20150023626A1	2015-01-22
JPS57126957A	1982-08-06
JPS57126957A	1982-08-06
CN107904498A	2018-04-13
CN107904498A	2018-04-13
CN109182901A	2019-01-11
CN109161658A	2019-01-08

See also references of EP 3865595A4

BEIJING WITAL PATENT AGENCY LTD (CN)

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