Steel for wind power shaft parts and manufacturing method thereof

• Main Authors: MU CHANGZHENG, ZHANG WENTAO, LIU BING, LU FENG, LIANG NA, LIU JINLING, GE WENYING, ZHAO GUANFU, MA CHUANQING
• Format: Patent
• Language: Chinese; English
• Published: 02.07.2024
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; METALLURGY OF IRON; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention belongs to the technical field of metallurgy, and particularly relates to steel for wind power shaft parts and a manufacturing method thereof.The steel for the wind power shaft parts comprises, by mass, 0.39-0.44% of C, 0.20-0.30% of Si, 0.75-0.85% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.005% of S, 0.015-0.030% of Al, smaller than or equal to 0.005% of Ti, smaller than or equal to 0.0010% of Ca, 1.10-1.30% of Cr, 0.20-0.35% of Mo, smaller than or equal to 0.10% of Ni, smaller than or equal to 0.10% of Cu, smaller than or equal to 70 * 10 <-4 >% of [N], smaller than or equal to 13 * 10 <-4 >% of [O], smaller than or equal to 1.2 And the C grade difference + Mn grade difference + Cr grade difference of the cross section of the steel billet is less than or equal to 0.09%. The prepared steel billet is forged and pressed into a wind power shaft part, the tensile strength, the yield strength, the impact energy and other performance of the forged part are excellent, and