BÖHLER Union S3 Si // UV 421 TT
S3 Si Union wire is normally used in structural steels welding, offshore industry and carbon steels with leak limit upper to 460 Mpa subject or no to a thermic treatment and post-welding tension relieve. UV 421TT flux is mainly constituted of 16% SiO2+TiO2; 34%CaO+MgO; 21% Al2O3+MnO and 26% CaF2, being classified as cluttered flux type basic fluorite with high basicity (3.3%Mol and 2.5% weight) and neutral metallurgical behavior. It possesses grain size between 0.3 and 2.0 mm. We recommended a 300 – 350ºC /2h redrying before its using. Excellent slag detaching, even in close bevels. It may be specially used in multipass welding of medium and high mechanical resistance steels. At low temperatures are obtained great tenacity values of welded metal. Tested and approved according to PETROBRAS N1859 regulation, including CTOD tests (0ºC).