... STD ASTM A234 WPB Special design available. 1) Types: Seamless and butt-welded elbows2) Size: 3 1/2" DN15-DN12003) Wall Thickness: ... ; 16Mo3 10CrMo5-5, 13CrMo4-5, 10CrMo9-10 X11CrMo5 X11CrMo9-1 X10CrMoVNb9-1; X2CrNi18-9, X2CrNi19-11, X2CrNiN18-10, X5CrNi18-10, X6CrNiTi18 ... 2, X6CrNiMoTi17-12-2, X2CrNiMo 17-12-3, X2CrNiMoN17-13-3, X3CrNiMo17-13-3, X2CrNiMo18-14-3, X2CrNiMoN17-13-5, X2CrNiMo18-15-4, ...