# US 10,864,596 B2 · Metal laminate material and production method therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,864,596 B2 - Document ID: US10864596B2 - Status: Granted - Kind: B2 - Application number: 15/764,381 - Filed: 2016-09-30 - Published: 2018-10-04 - Granted: 2020-12-15 - Earliest claimed: 2015-09-30 - Assignees: Toyo Kohan Co., Ltd. - Applicants: Toyo Kohan Co., Ltd. - Inventors: Kouji Nanbu; Teppei Kurokawa; Takashi Koshiro; Hironao Okayama - Web page: https://patentgrep.com/patent/US10864596B2 ## CPC - B23K 20/04: by means of a rolling mill - B21B 1/22: for rolling {plates, strips,} bands or sheets of indefinite length (B21B1/42 takes precedence) - B32B 15/01: all layers being exclusively metallic {(making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00)} - B32B 15/012: {one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy} - C21D 6/00: Heat treatment of ferrous alloys - C21D 9/46: for sheet metals - C22C 38/06: containing aluminium - B23K 2103/20: Ferrous alloys and aluminium or alloys thereof - C21D 2251/02: Clad material - C22C 38/40: with nickel - C22C 38/44: with molybdenum or tungsten - Y10T 428/12757: Fe - B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM - B21B: ROLLING OF METAL (auxiliary operations used in connection with metal-working operations covered in B21, see B21C; bending by rolling B21D; manufacture of particular objects, e.g. screws, wheels, rings, barrels, balls, by rolling B21H; pressure welding by means of a rolling mill B23K20/04) - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B) - C22C: ALLOYS (treatment of alloys C21D, C22F) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract It is an objective of the present invention to provide a metal laminate material, which has sufficient strength as well as molding processability, lightweight properties, and radiation performance, which is a metal laminate material that has a two-layer structure of a stainless steel layer and an aluminum layer or a three-layer structure of a 1st stainless steel layer, an aluminum layer, and a 2nd stainless steel layer, wherein tensile strength TS is 200≤TS≤550 (MPa), elongation EL is not less than 15%, and a surface hardness Hv of the stainless steel layer is not more than 300 for the metal laminate material. ## Claims ### Claim 1 A metal laminate material, which has a two-layer structure of a SUS316L stainless steel layer and an aluminum layer or a three-layer structure of a 1st SUS316L stainless steel layer, an aluminum layer, and a 2nd SUS316L stainless steel layer, wherein tensile strength TS is 200≤TS≤550 (MPa), elongation EL is not less than 15%, and a surface hardness Hv of each SUS316L stainless steel layer is not more than 300 for the metal laminate material, and wherein each SUS316L stainless steel layer has an average crystal grain size of 1.5 μm to 10 μm, and the number of shear bands traversing a straight line having a length of 10 μm, the straight line extending along the normal direction (ND) in a sample coordinate system on a cross-sectional observation image viewed from the transverse direction (TD) in the sample coordinate system, is less than 5 for the SUS316L stainless steel layer. ### Claim 2 (depends on 1) The metal laminate material according to claim 1, which has a thickness of 50 μm to 500 μm. ### Claim 3 (depends on 1) The metal laminate material according to claim 1, which has a dome height in Erichsen cupping test (Erichsen value) of not less than 4.6 mm. ### Claim 4 (depends on 1) A method for producing the metal laminate material having the two-layer structure of the stainless steel layer and the aluminum layer according to claim 1, which comprises: a step of sputter-etching a stainless steel foil having a surface hardness Hv of not more than 300; a step of sputter-etching an aluminum foil having a surface hardness Hv of not less than 20; and a step of pressure-bonding a sputter-etched side of the stainless steel foil and a sputter-etched side of the aluminum foil at a reduction rate of not more than 10%, thereby obtaining the metal laminate material having the two-layer structure of the stainless steel layer and the aluminum layer. ### Claim 5 (depends on 1) A method for producing the metal laminate material having the three-layer structure of a 1st stainless steel layer, an aluminum layer, and a 2nd stainless steel layer according to claim 1, which comprises: a step of sputter-etching the 1st stainless steel foil having a surface hardness Hv of not more than 300; a step of sputter-etching the aluminum foil having a surface hardness Hv of not less than 20; and a step of pressure-bonding a sputter-etched side of the 1st stainless steel foil and a sputter-etched side of the aluminum foil at a reduction rate of not more than 10%, thereby obtaining a two-layer material of a 1st stainless steel layer and an aluminum layer; a step of sputter-etching the aluminum layer side of the two-layer material; a step of sputter-etching the 2nd stainless steel foil having a surface hardness Hv of not more than 300; and a step of pressure-bonding a sputter-etched side of the two-layer material and a sputter-etched side of the 2nd stainless steel foil at a reduction rate of not more than 10%, thereby obtaining the metal laminate material having the three-layer structure of the 1st stainless steel layer, the aluminum layer, and the 2nd stainless steel layer. ### Claim 6 (depends on 4) The method for producing the metal laminate material according to claim 4, which further comprises a step of heat-treating the obtained metal laminate material at 100° C. to 500° C. ### Claim 7 (depends on 5) The method for producing the metal laminate material according to claim 5, which further comprises a step of heat-treating the obtained metal laminate material at 100° C. to 500° C.