Casting steel strip
AssigneesIsahikawajima-Harima Heavy Industries Co., Ltd., BHP Steel (JLA) Pty Ltd.
InventorsJohn Freeman, Lazar Strezov, Rama Ballav Mahapatra
Life of this patent
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Abstract
Method of continuously casting metal strip from a casting pool of molten metal supported on chilled casting rolls such that metal solidifies onto moving casting surfaces of the rolls. The metal is austenitic stainless steel containing chromium and nickel in a ratio (Cr/Ni).sub.eq of less than 1.60 and the casting surface of each roll has an Arithmetical Mean Roughness Value (R.sub.a) of more than 2.5 microns. The heat transferring from the austenitic stainless steel solidifying on the textured surface of the moving casting surface to the casting surface at an initial peak heat transfer rate is more than 15 MW/m within the initial 20 ms of contact.
Claims8
In a method of casting steel strip comprising:
- forming a casting pool of molten steel in contact with a moving casting surface having a substrate consisting primarily of copper;
- moving said casting surface relative to said casting pool;
- solidifying steel from said casting pool on said moving casting surface;
- and taking solidified steel away from said moving casting surface;
- the improvement comprising:
- providing steel comprising austenitic stainless steel containing chromium and nickel in a ratio (Cr/Ni).sub.eq of less than 1.6 in said casting pool;
- contacting said austenitic stainless steel in said pool with said moving casting surface having a textured surface which has an Arithmetic Mean Roughness Value (R.sub.a) of more than 2.5 microns provided by applying a texture to the substrate;
- and
- transferring heat from said austenitic stainless steel solidifying on said textured surface of said moving casting surface to said casting surface at an initial peak heat transfer rate of more than 15 MW/m.sup.2 within the initial 20 ms of contact, said heat transfer rate being sufficiently high to enable the solidification of said steel on said surface without deleterious segregation and surface cracking.
Dependencies are inferred from the claim text.