That was the case for me. I think its just like a 600, but you should double check. All I know is that I am terrible at English and I got credit for it through my terrible SAT score.
Enrolling students with SAT Writing scores between 600 and 800 and ACT writing scores of 26 or higher earn credit for freshman English (RHE 306) at UT Austin. Details about earning credit for RHE 306 and other credit through placement testing is available on the Student Testing Services web site.