Can a social security transfer order from Xi'an be used 3 months after it was issued?

It can be used. There is no time limit on the social security transfer voucher, as long as the original unit issued to you will be valid, so the social security transfer order in Xi'an can still be used after 3 months. Xi'an City, referred to as "Hao", the ancient name of Chang'an, Haojing, prefecture-level cities under the jurisdiction of Shaanxi Province, is the capital of Shaanxi Province, a sub-provincial city, a megacity, a national central city, Xi'an metropolitan area and the Guanzhong Plain urban agglomeration of core cities.