Semi GPC (SGPC) sitere na mkpuchi mkpuchi nke ọkụ acheson. The graphitization okpomọkụ dị na nso 1700-2500ºC. Ọ bụ nke ngwaahịa graphitization okpomọkụ. Ọ bụ recarburizer nke akụ na ụba nwere carbon dị elu, ọdịnaya sọlfọ dị ala, ọnụego mgbasa ngwa ngwa yana ọnụego nnabata dị elu.