… welding properties due to a increased manganese and silicon content. S3Si is best to be used with FL 155 high basic agglomerated flux to obtain neutral action on … ASTM Typical A 258 / A 516 A 662 / A 387 A 738 / A 612 A 299 - -   … S3Si … A 5.17: EH12K … 14171-A: S3Si …