• TIG Welding 4130 Chromoly Tubing TIG Welding 4130 Chromoly Tubing 4130 chromoly steel  has an excellent strength to weight ratio, is easily welded and is considerably stronger and harder than standard 1018 steel. The 4130 grade of chromoly or chrome-moly is a high-strength low-alloy (HSLA) steel that contains molybdenum (0.15 – 0.25 percent by weight)... Read more >>