Illinois No. 6, a high-volatile B coal of low fluidity, was blended with fluidized-bed char and coke breeze to improve the strength of the coke obtained from carbonizing this coal. Twenty-one tests, selected from those made in the small-scale hanson carbonizer, were carbonized in the bm-aga 13-inch-diameter, cylindrical retort, with a coal charge of about 90 pounds; the strength of the cokes was determined by the standard ASTM tumbler test. Using the same procedure, 10 tests were made with high splint, a high-volatile a coal from Harlan County, Kentucky. Carbonization of the blends produced larger and stronger cokes than did the Illinois No. 6 Coal singly. The optimum blend contained 6 percent each of char and coke breeze. Further improvement in coke strength was realized by either preheating this blend prior to carbonization or by adding a small proportion of a premium blending coal. The former method could possibly eliminate the use of premium coking coals in blends with Illinois No. 6 Coal to make an acceptable metallurgical coke. Except for no improvement in coke strength by preheating, results for high splint coal showed behavior similar to that of the Illinois No. 6 Coal.