ENDLESS MANUFACTURING METHOD OF FERRITIC STAINLESS STEEL WHICH IS APPLIED BY A HIGH SPEED ELECTROLYTIC ACID PICKLING PROCESS WHICH CREATES NO DAMAGE ON THE SURFACE OF ANNEALED AND HEAT-TREATED STAINLESS STEEL

摘要

PURPOSE: An endless manufacturing method of ferritic stainless steel is provided to control the current density and surface potential of ferritic stainless steel which is annealed and heat-treated after an endless cold rolling process; thereby removing generation of trans-granular corrosion, scale, and pitting; and maintaining brilliance of the cold-rolled stainless steel.;CONSTITUTION: An endless manufacturing method of ferritic stainless steel is composed of the following steps. Stainless steel is rolled by a tandem rolling mill which is equipped with two or more rolling mill stands. The continuously rolled stainless steel is rolled by a reversing rolling mill. The reversibly rolled stainless steel is annealed in an annealing furnace. The annealed and heat-treated stainless steel is acid-pickled in at least one electrolytic acid pickling tank at the rate of more than 100mpm to less than 150mpm.;COPYRIGHT KIPO 2013;[Reference numerals] (AA) Surface potential(V); (BB) Activated exudation; (CC,FF,GG) No residual scale exists; (DD) Residual scale exists; (EE) Residual scale