METHOD FOR PRODUCING AUSTENITE STAINLESS STEEL SLAB

Title:

METHOD FOR PRODUCING AUSTENITE STAINLESS STEEL SLAB

Document Type and Number:

WIPO Patent Application WO/2018/173888

Kind Code:

A1

Abstract:

[Problem] To provide a continuous casting technique for stably and significantly suppressing surface defects generated in the longitudinal direction (the casting direction) of an austenite stainless steel continuous cast slab. [Solution] A method for producing an austenite stainless steel slab, wherein, in continuous casting of an austenite stainless steel, electromagnetic stirring (EMS) is performed by applying electric power at least to molten steel in a depth region where the solidified shell thickness is 5-10 mm at the center position in the long-side direction, the electric power being applied so that long-side direction streams flowing in opposite directions along both long sides are generated, and the casting condition is controlled so that the expression 10 <ΔT < 50 × FEMS + 10 is satisfied. In the expression, ΔT denotes a difference between the average molten steel temperature (°C) and the solidification starting temperature (°C) of the molten steel, and FEMS denotes a stirring strength index represented by a function of the flow rate of the molten steel in the long-side direction caused by electromagnetic stirring, and a casting speed.

Inventors:

EHARA YASUHIRO (JP)
SAITO SHUN (JP)
MORITA KAZUNARI (JP)
MORIKAWA HIROSHI (JP)

Application Number:

PCT/JP2018/009989

Publication Date:

September 27, 2018

Filing Date:

March 14, 2018

Export Citation:

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Assignee:

NISSHIN STEEL CO LTD (JP)

International Classes:

B22D11/00; B22D11/115; B22D11/20; C22C38/00; C22C38/58

Domestic Patent References:

WO2015147216A1

2015-10-01

Foreign References:

JP2010052026A	2010-03-11
JP2010024522A	2010-02-04
JPH06190507A	1994-07-12
JP2004098082A	2004-04-02
JPH10166120A	1998-06-23
JP2005297001A	2005-10-27
JP2017024078A	2017-02-02

Other References: