Through an analysis of process requirements in specifications of titanium alloy castings （Ti-6Al-4V） which were selected from both at home and abroad

the differences and references among those specifications were investigated systematically. The vesults show that the domestic master heat can use revert materials as abroad to reduce cost. The differences among chemical components were focused on the elements of Al

H

Si. Especially the foreign specifications of aircraft engineering claimed more severe upper limit for Si and Y elements. After comparing mechanical properties

it is found that the ultimate tensile strength （UTS）

yield strength （YS） of domestic standards are 30 MPa

48

7

5 MPa higher than the requirements of Snecma and GE

respectively. The facts suggest domestic specification to reduce the strength requirements. The domestic applicable feature thickness range for ASTM E192 reference plate needed to conform to standards abroad. ASTM E1320 reference radiographs for titanium castings should be popularized to titanium castings as X-ray inspection standards.