Abstract: A heat exchanger includes a core unit having a plurality of pipe members open at opposite ends and arranged in parallel, a pair of tanks joined to the core unit to sandwich the core unit from opposite sides in a longitudinal direction of the pipe members and communicating with the pipe members, and a partition plate for closing a cross-section of the tank intersecting with a pipe member arrangement direction. A pair of projections for sandwiching the partition plate from opposite sides in the pipe member arrangement direction is provided on an inner wall surface of the tank. The projections are formed by plastic working parts of the tank at opposite sides of a part to be held in contact with the partition plate in a direction at the pipe member arrangement direction from an outer side toward an inner side of the tank.

Abstract: A heat exchanger includes a core unit having a plurality of pipe members arranged in parallel, a pair of tanks joined to the core unit to sandwich the core unit from opposite sides in a longitudinal direction of the pipe members and communicating with the pipe members, and a partition plate for closing a cross-section of the tank. The partition plate includes a recess on an outer edge portion to be held in contact with an inner wall surface of the tank, the tank includes a projection to be engaged with the recess on the inner wall surface, and the projection and the recess are formed by plastic working a part of the tank in contact with the partition plate from an outer side toward an inner side of the tank in a state where the partition plate is arranged in the tank.

Abstract: A heat exchanger comprising a tube, a fin, and a header pipe, wherein the tube contains, in mass %, 0.15 to 0.45% of Mn, 0.20 to 0.50% of Si, and the balance of Al and unavoidable impurities, and is coated with a coating of brazing composition containing 1.0 to 5.0 g/m2 of Si powder, 4.0 to 10.0 g/m2 of KZnF3, and 0.5 to 3.0 g/m2 of binder; the fin contains, in mass %, 1.20 to 1.80% of Zn, 0.70 to 1.20% of Si, 0.30 to 0.80% of Fe, 0.90 to 1.50% of Mn, one or two or more selected from 0.05 to 0.20% of Zr, 0.01 to 0.10% of V, and 0.01 to 0.10% of Cr, and the balance of Al and unavoidable impurities; and the header pipe comprises a core material, outer sacrificial corrosion protection material, and an inner brazing material.