US 11,898,216 B2
Seamless steel pipe heat-treatment-finishing-treatment continuous facility
Hiroki Kamitani, Tokyo (JP); Takanori Tanaka, Tokyo (JP); Atsushi Soma, Tokyo (JP); Keiichi Kondo, Tokyo (JP); Hideki Mitsunari, Tokyo (JP); Seiya Okada, Tokyo (JP); Takuya Matsumoto, Tokyo (JP); Shinji Yoshida, Tokyo (JP); and Yuji Arai, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 16/981,435
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Mar. 26, 2019, PCT No. PCT/JP2019/012820
§ 371(c)(1), (2) Date Sep. 16, 2020,
PCT Pub. No. WO2019/189158, PCT Pub. Date Oct. 3, 2019.
Claims priority of application No. 2018-062481 (JP), filed on Mar. 28, 2018.
Prior Publication US 2021/0025021 A1, Jan. 28, 2021
Int. Cl. C21D 9/08 (2006.01); B21D 41/04 (2006.01); C21D 8/10 (2006.01)
CPC C21D 9/085 (2013.01) [B21D 41/04 (2013.01); C21D 8/105 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A seamless steel pipe heat-treatment-finishing-treatment continuous facility comprising:
a heat treatment apparatus configured to allow a seamless steel pipe to be inserted therein, the heat treatment apparatus performing tempering on the seamless steel pipe inserted into the heat treatment apparatus;
a steel pipe inspection apparatus configured to perform a test for a surface defect and/or an inner defect of the seamless steel pipe discharged and transferred from the heat treatment apparatus, the steel pipe inspection apparatus being disposed downstream of the heat treatment apparatus;
a main transfer mechanism forming a main transfer path for transferring the seamless steel pipe, which is discharged from the heat treatment apparatus, to the steel pipe inspection apparatus disposed downstream of the heat treatment apparatus, the main transfer mechanism including a plurality of transfer members for transferring the seamless steel pipe; and
a first forced steel pipe-temperature reduction apparatus configured to forcibly reduce a temperature of the seamless steel pipe on the main transfer path, wherein the first forced steel pipe-temperature reduction apparatus reduces the temperature of the seamless steel pipe at a cooling rate higher than a cooling rate of cooling in air, the first forced steel pipe-temperature reduction apparatus being disposed on the main transfer path at a position downstream of the heat treatment apparatus, and upstream of the steel pipe inspection apparatus,
wherein the first forced steel pipe-temperature reduction apparatus is, via the main transfer mechanism, connected to the heat treatment apparatus disposed upstream of the first forced steel pipe-temperature reduction apparatus, and the first forced steel pipe-temperature reduction apparatus is, via the main transfer mechanism, also connected to the steel pipe inspection apparatus disposed downstream of the first forced steel pipe-temperature reduction apparatus.