公开(公告)号：US20240318292A1

公开(公告)日：2024-09-26

申请号：US18574476

申请日：2022-06-29

Applicant: JFE STEEL CORPORATION ,  TOCALO CO., LTD.

Inventor： Tatsumichi YAMADA ,  Chihiro KONDO ,  Ichiro TANOKUCHI ,  Shinichi OKUNO ,  Masayasu UENO ,  Tatsuo SUIDZU ,  Kei YAMAGUCHI

IPC: C23C4/073 ,  C22C19/07 ,  C23C4/18

CPC classification number: C23C4/073 ,  C22C19/07 ,  C23C4/18

Abstract: A coating material and a surface coating method for an in-furnace structure, and an in-furnace structure that are excellent in resistance to corrosion by the sulfur group. The coating material for an in-furnace structure used in a high-temperature corrosive environment including a sulfur group element includes as component composition, by mass, Co: 45% to 72%, both inclusive, Mo: 20% to 35%, both inclusive, Cr: 8% to 25%, both inclusive, and Si: 0.1% to 5%, both inclusive, and substantially without Ni. In the surface coating method used in a high-temperature corrosive environment including a sulfur group element, a coating is formed on a surface of the in-furnace structure by overlay welding or thermal spraying of the above-described coating material. In the in-furnace structure used in a high-temperature corrosive environment including a sulfur group element, a coating using the above-described coating material is formed on a surface of the in-furnace structure.

公开(公告)号：US20240102125A1

公开(公告)日：2024-03-28

申请号：US18275243

申请日：2021-12-27

Applicant: JFE STEEL CORPORATION

Inventor： Masaki HIRAI ,  Yusuke OTA ,  Ichiro TANOKUCHI

IPC: C21D11/00 ,  C21D9/573

CPC classification number: C21D11/005 ,  C21D9/573

Abstract: A cooling water temperature control method, includes: calculating thickness of a water film remaining on a steel sheet; calculating a change in the thickness of the water film; calculating a change in temperature of the steel sheet; calculating a steel sheet temperature on an exit side of a draining roll at which a position where the thickness of the water film on the steel sheet becomes zero coincides with an exit side position of a drying equipment, and setting the calculated temperature to a lower limit value; calculating a steel sheet temperature on the exit side of the draining roll at which the steel sheet temperature on the entrance side of coating equipment coincides with a predetermined temperature and setting the calculated temperature to an upper limit value; and controlling the temperature of cooling water within a range of the lower limit value and the upper limit value.