Patent ID: 11891675
Assignee: JFE STEEL CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 1:
2. A method of producing a duplex stainless clad steel plate in which a duplex stainless steel plate as a cladding metal is bonded or joined to one or both surfaces of a base steel plate, the method comprising:
preparing a clad slab by stacking a first blank plate to be the base steel plate and a second blank plate to be the duplex stainless steel plate as the cladding metal in a layered manner, the first blank plate comprising the first chemical composition as recited in claim 1, and the second blank plate comprising the second chemical composition as recited in claim 1 and a microstructure containing a ferrite phase in an area fraction of 35% to 65%;
heating the clad slab to 1050° C. to 1250° C.;
then hot rolling the clad slab with a rolling reduction ratio of 2.0 or more to obtain a rolled clad body in which the base steel plate and the duplex stainless steel plate are bonded or joined together;
allowing the rolled clad body to naturally cool;
then reheating the rolled clad body to 1000° C. to 1100° C.;
then cooling the rolled clad body such that the duplex stainless steel plate is cooled at a cooling rate of 0.8° C./s or higher and the base steel plate is cooled at a cooling rate of 1.0° C./s or higher; and
then tempering the rolled clad body at 700° C. or lower to produce the duplex stainless clad steel plate of claim 1.