公开(公告)号：US20190010569A1

公开(公告)日：2019-01-10

申请号：US16066156

申请日：2016-12-28

Applicant: Sandvik Intellectual Property AB

Inventor： Erik KÖNBERG ,  Daniel SVEDBERG

IPC: C21D9/08 ,  C21D8/10 ,  C21D6/00 ,  C22C38/44 ,  C22C38/42 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

Abstract: A process of producing a duplex stainless steel tube comprises the steps of: a) producing an ingot or a continuous casted billet of said duplex stainless steel; b) hot extruding the ingot or the billet obtained from step a) into a tube; and c) cold rolling the tube obtained from step b) to a final dimension thereof. The outer diameter D and the wall thickness t of the cold rolled tube is 50-250 mm respectively is 5-25 mm, and, for the cold rolling step, R and Q are set such that the following formula is satisfied: Rp0.2target=416.53+113.26·log Q+4.0479·R+2694.9·C %−82.750·(log Q)2−0.04279·R2−2.2601·log Q·R+16.9·Cr %+26.1·Mo %+83.6·N %+Z  (1) wherein Rp0.2target is targeted yield strength and is 800-1100 MPa and 0

公开(公告)号：US20190017134A1

公开(公告)日：2019-01-17

申请号：US16066721

申请日：2016-12-28

Applicant: Sandvik Intellectual Property AB

Inventor： Erik KÖNBERG ,  Daniel SVEDBERG

IPC: C21D8/10 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/44 ,  C22C38/42

Abstract: A process of producing an austenitic stainless steel tube comprises the steps of: a) producing an ingot or a continuous casted billet of the austenitic stainless steel, b) hot extruding the ingot or the billet obtained from step a) into a tube, c) cold rolling the tube obtained from step b) to a final dimension thereof. The outer diameter D of the cold rolled tube is 70-250 mm and the thickness t thereof is 6-25 mm, and the cold rolling step is performed such that the following formula is satisfied: (2.5×Rc+1.85×Rh−17.7×Q)=(Rp0.2target+49.3−1073×C−21Cr−7.17×Mo−833.3×N)±Z   (1) wherein Rp0.2target is targeted yield strength and is 750≤Rp0.2target≤1000 MPa, 30≤Rc≤75%, 50%≤Rh≤90%, 1≤Q≤3.6, and Z is 65.