Effect of Cr on Property of Stainless Steel Joint Brazed with Series Ni-P Filler Metal

The effects of brazing temperature on spreadability of series Ni-P filler metal and mechanical property of the stainless steel joint brazed with the filler metal were studied.The results show that the spreading area of series Ni-P filler metal increases with the increase of brazing temperature,and the spreading areas of Ni-P filler metal is larger than that of Ni-Cr-P filler metal;the shear strength of the brazed joint at room temperature increases with the increase of temperature from 925℃ to 1000℃,and the shear strength of the stainless steel joint brazed with Ni-P filler metal is superior to that with Ni-Cr-P filler metal by 30～40 MPa in the same brazing technology.The high temperature strength of Ni-P series brazed joints decreases with the increase of testing temperature,the strength of the joint brazed with Ni-P can be improved by 0～30 MPa through adding Cr at the same testing temperature above 500 ℃.