Influence of the prime hard coking coal in stamp charge cokemaking: true or false Hari Prakash Tiwari, Vishwesh M. Shisani, Bhavendra Kumar Sahu, Rabindra Kumar Sabat and Damodar Mittal Metall. Res. Technol., 117 4 (2020) 412 Published online: 12 August 2020 DOI: 10.1051/metal/2020046