Plate type heat exchanger and method for manufacture thereof

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A plate type heat exchanger wherein contacting portions of laminated plural plates and fins or contacting portions of laminated plural plates are brazed to form a heat exchange area, characterized in that at least the surface of a plate or fin contacting with a fluid is covered with an alloy comprising in weight ratio 25 - 35 % of chromium, 5 - 7 % of phosphorus, 3 - 5 % of silicon, 0.001 - 0.1 % of at least one selected from the group consisting of aluminum, calcium, yttrium and mischmetal, and balance containing mainly nickel. The alloy may contain 15 % or less of iron and or 10 % or less of molybdenum. The plate type exchanger exhibits enhanced pressure resistance and is excellent in corrosion resistance.