METHOD FOR PRODUCING NICKEL-BASED STEEL FROM HIGH PHOSPHORUS MOLTEN IRON

WIPO Patent Application WO/2021/212581

A1

Disclosed is a method for producing a nickel-based steel from a high phosphorus molten iron, the method comprising using converter smelting, wherein the P content of the molten iron used is 0.130-0.150%; a process involving slag retention in the early stages and slag doubling in the later stages is used; the final smelting temperature is 1580-1620ºC; the bottom stirring flow is 350-400 NL/min in the middle and later periods of smelting; the basicity of the final slag is 4.0; the control amount of the final slag is 10-12 tons; a decarburization rate of ≥99% and a dephosphorization rate ≥96% in the converter are achieved; LF refining, a RH vacuum treatment, and arc continuous casting machine pouring are performed; TMCP rolling is used; the temperature is cooled to 300±20ºC by means of ACC water cooling and then to room temperature by means of air cooling; and a steel plate is heated to 550±10ºC, tempered for 3×h minutes, with h being the thickness of the plate, and is then air cooled to room temperature.

ZHAI DONGYU (CN)
WU JUNPING (CN)
FANG LEI (CN)

PCT/CN2020/090749

October 28, 2021

May 18, 2020

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NANJING IRON & STEEL CO LTD (CN)

C21C7/06; C21C7/10; C21D1/02; C22C38/08

CN103602888A	2014-02-26
CN104878153A	2015-09-02
CN101864537A	2010-10-20
JP2011214098A	2011-10-27
CN108624735A	2018-10-09
CN102978332A	2013-03-20
JPS60181227A	1985-09-14
JP2002012951A	2002-01-15

NANJING LI&FENG INTELLECTUAL PROPERTY AGENCY (SPECIAL CENERAL PARTNERSHIP) (CN)

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