Based on your dimensions given and guessing the rest from the pictures. ( 10" x 3" flange?...plus if your web thickness is thicker than .125" then your weight and scrap value go up) I calculated 1560 cubic inches of metal, multiply by the density of .283 of steel. You have 441# per ibeam. Multiply that by what you would get at your yard. So, anything higher than your answer is better than taking it to a scrap yard. At 0.10 per pound, thats only 44 bucks per beam plus they probably would want you to cut it. Sell on craigslist for $100 a beam would be a steal for anyone.