Do you mean if my past contribution is over the benefits threshold, I will be able to claim refund for social security tax when I leave US?
No. If you meet the "benefits threshold" (and possibly meet other criteria), you will be able to claim Social Security when you retire.
The only time that you can get a refund for FICA tax is if it is inappropriately withheld in the first place. However, that is a very specific set of circumstances that you probably don't meet. If you were temporarily a tax resident of the United States, you had to pay FICA. That's true even if you stopped being a tax resident. You'd only get a refund if you weren't supposed to be a tax resident and your employer withheld inappropriately.
Benefits threshold is not an official term. Officially, they talk about Social Security credits. Someone may need to have up to forty credits to be eligible, and only four credits can be earned per year. The forty credits would be the "benefits threshold" (unofficially, just as a thing to call it).