Pitting Corrosion of the Resistance Welding Joints of Stainless Steel Ventilation Grille Operated in Swimming Pool Environment

Table 1

Chemical composition of selected stainless steels according to EN 10088-1 standard [8].

Steel grade		Nominal chemical composition [% by mass]
Name	Number	C	N	Cr	Mo	Ni	Other
X8CrNi18-8	1.4301	≤0,070	≤0,11	17,5~19,5	-	8,0~10,5	-
X2CrNi18-9	1.4307	≤0,030	≤0,11	17,5~19,5	-	8,0~10,5	-
X5CrNiMo17-12-2	1.4401	≤0,070	≤0,11	16,5~18,5	2,0~2,5	10,0~13,0	-
X2CrNiMo17-12-2	1.4404	≤0,030	≤0,11	16,5~18,5	2,0~2,5	10,0~13,0	-
X1CrNiMoCu25-20-5	1.4539	≤0,020	≤0,15	19,0~21,0	4,0~5,0	24.0~26.0	Cu = 1,2~2,0
X1CrNiMoCuN20-18-7	1.4547	≤0,020	0,18~0,25	19,5~20,5	6,0~7,0	17,5~18,5	Cu = 0,5~1,0

Si ≤ 1,0; Mn ≤ 2,0; ; ≤ 0,015; ≤ 0,7; Mn ≤ 2,0; = 0,030; ≤ 0,010; ≤ 0,7; Mn ≤ 1,0; = 0,030; ≤ 0,010.