Patent ID: 9513072
Filing Date: 2016-12-06
CPC Classification: B23K,C22C,F28F,Y10T

Claim Text:
1. A plate heat exchanger product comprising components made of an iron based plate material and brazed together with an iron-based brazing material, wherein the components are heat exchanger plates, the product being a plate heat exchanger configured for at least two heat exchanging media and comprising at least one plate package including several of the heat exchanger plates, wherein the heat exchanger plates are made of the iron based plate material which is 316 stainless steel comprising maximum 2.0 wt % Mn, 16.5-18 wt % Cr, 10.0-13.0 wt. % Ni, 2.0-2.5 wt % Mo, balance Fe and inevitable amounts of contaminating elements brazed together with the iron-based brazing material at the brazed joints having a metallurgical composition close to, and with a higher amount of Si than, the composition of the iron based plate material, the iron-based brazing material comprising braze filler alloy, which braze filler alloy consists of: from 9 wt % to 30 wt % Cr; from 5 wt % to 25 wt % Ni; from 0.5 wt % to 9 wt % Mo; from 1 wt % to 5 wt % Mn; from 0 wt % to 1 wt % N; from 6 wt % to 20 wt % Si; wherein B is present as a melting point lowering supplement to Si, and wherein B is from 0.1 wt % to 1.5 wt %; and contaminating elements as at least one of C, optionally the brazing alloy also consists of at least one micro-alloying element as V, Ti, W, Nb, or Ta, and the micro-alloying element is less than 1.5 wt % in the braze filler alloy; and wherein the alloy is balanced with Fe; wherein all values are stated in weight percent, wherein the Si and the B lowers the liquidus temperature, that is the temperature when the brazing material is completely melted, and B increases the wettability of the braze filler alloy.