6Al-6V-2Sn Titanium per MMS 1203
The MMS 1203 is a Boeing specification that covers 6Al-6V-2Sn Titanium Sheet & Plate
6-6-2 Alloy (UNS R56620) is a highly beta-stabilized, two-phase, alpha-beta titanium alloy which is a modification of the Ti6Al-4V system. Because of the higher Beta stabilizing elements (additional Vanadium + Fe and Cu), this alloy has a higher strength potential than Ti-6Al-4V, but at a sacrifice of weldability and toughness. In most cases, the welding of 6-6-2 alloy is not recommended. It can be used in the annealed or solution treated and aged conditions.
Why does your project call out MMS 1203?
DMS specifications originate from Boeing’s St. Louis facility under D1-4426 Approved Process Lists. MMS 1203 originated at the St. Louis facility, therefore it is widely used for Boeing’s aircraft manufacturing at multiple locations.
