Titanium casting product for hot rolling and method for producing the same

Patent metadata

Field	Value
Publication number	US-2017282231-A1
Application number	US-201415513904-A
Country	US
Kind code	A1
Filing date	Sep 30, 2014
Priority date	Sep 30, 2014
Publication date	Oct 5, 2017
Grant date	—

Abstract

Provided is a titanium cast product made of commercially pure titanium, the titanium cast product being produced by electron-beam remelting or plasma arc melting, comprising: a melted and resolidified layer in a range of 1 mm or more in depth at a surface serving as a surface to be rolled, the melted and resolidified layer being obtained by adding one or more kinds of β stabilizer elements to the surface and melting and resolidifying the surface. An average value of β stabilizer element(s) concentration in a range of within 1 mm in depth is higher than β stabilizer element(s) concentration in a base material by, in mass %, equal to or more than 0.08 mass % and equal to or less than 1.50 mass %. As the material containing the β stabilizer element, powder, a chip, wire, or foil is used. As means for melting a surface layer, electron-beam heating and plasma arc heating are used.

First claim

1 .- 6 . (canceled)

7 . A titanium cast product made of commercially pure titanium, comprising:
a layer containing one or more kinds of β stabilizer elements in a range of 1 mm or more in depth at a surface serving as a surface to be rolled, wherein an average value of β stabilizer element concentration in a range of within 1 mm in depth is higher than β stabilizer element concentration in a base material by, in mass %, equal to or more than 0.08 mass % and equal to or less than 1.50 mass %.

8 . The titanium cast product according to claim 7 , wherein the β stabilizer element(s) is/are one or more of Fe, Ni, and Cr.

9 . The titanium cast product according to claim 7 , containing one or more kinds of a stabilizer elements or neutral elements together with the β stabilizer element(s).

10 . A method for producing a titanium casting cast product, comprising:
melting a surface serving as a surface to be rolled of a titanium cast product together with a material containing a β stabilizer element and then solidifying the surface to make an average value of β stabilizer element concentration in a range of within 1 mm in depth higher than β stabilizer element concentration in a base material by, in mass %, equal to or more than 0.08 mass % and equal to or less than 1.50 mass %, the titanium cast product being made of commercially pure titanium.

11 . The method for producing a titanium cast product according to claim 10 ,
wherein the material containing the β stabilizer element is in a form of any of powder, a chip, wire, and foil.

12 . The method for producing a titanium cast product according to claim 10 ,
wherein the surface serving as the surface to be rolled of the titanium cast product is melted by electron-beam heating or plasma heating, the titanium cast product being made of commercially pure titanium.

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• Tatsuzawa Yoshitsugu
• Kunieda Tomonori
• Mori Kenichi
• Fujii Hideki
• Takahashi Kazuhiro

Classifications

• B32B15/01

  all layers being exclusively metallic {(making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00)} · CPC title

• C22B9/16

  Remelting metals (liquating C22B9/02) · CPC title

• C22B9/225

  by microwaves · CPC title

• B21B2001/028

  Slabs · CPC title

• B21B1/22

  for rolling {plates, strips,} bands or sheets of indefinite length (B21B1/42 takes precedence) · CPC title