I’ve pulled a lot of posts of all sorts with a chain and jackall. (High lift jack, like what you see Jeep drivers strap to their vehicle). It will even pull a steel post out of concrete, unless there is something protruding from the pipe to hold it. Sometimes I cut the pipe at about 3 feet from the ground and hit it a couple times hard straight down with a sledge hammer to break it free. Then pull with jack.