TITANIUM SLAB FOR SURFACE MELTING TREATMENT AND TITANIUM MATERIAL FOR HOT ROLLING USING SAME

Title:

TITANIUM SLAB FOR SURFACE MELTING TREATMENT AND TITANIUM MATERIAL FOR HOT ROLLING USING SAME

Document Type and Number:

Japanese Patent JP2018083232

Kind Code:

A

Abstract:

PROBLEM TO BE SOLVED: To provide a titanium slab for surface melting treatment which is excellent in workability in cold rolling or cold molding after hot rolling.SOLUTION: A titanium slab for surface melting treatment is used in production of titanium material by forming a re-melted/solidified layer having depth of d1, through surface melting treatment, on a surface of a titanium slab in an as-cast state obtained by a DC slab casting method in a vacuum or in an inert gas atmosphere, and performing hot rolling using the surface as a rolling surface, where an increase amount C1 in average oxygen concentration in a first region (a region between the surface and a position at d1/2) is 0.20 mass% or less, and an increase amount C2 in average oxygen concentration in a second region (a region between the position at d1/2 and a position at d1) is 0.05 mass% or less, with respect to average oxygen concentration of base material for the titanium slab, in a thickness direction of the titanium slab, and Cd (= C1 - C2) is more than 0 and 0.15 mass% or less.SELECTED DRAWING: Figure 7

Inventors:

FUJII HIDEKI
KUNIEDA TOMONORI
TATSUZAWA YOSHITSUGU
TAKAHASHI KAZUHIRO
MORI KENICHI
MITO TAKESHI
MOROTOMI KEISUKE
INOUE YOSUKE

Application Number:

JP2017247133A

Publication Date:

May 31, 2018

Filing Date:

December 25, 2017

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP
TOHO TITANIUM CO LTD

International Classes:

B21B1/02; B21B3/00; B22D11/00; B22D11/041; B22D11/12; B22D29/00

Attorney, Agent or Firm:

Patents corporation Blitas

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