copper clad flat steel 1, copper layer average thickness than 0.25mm; 2, tensile strength than ... , exothermic welding powder, grounding electrode, GEM and so on. copper clad flat steel 1, copper layer average thickness (conventional) ≥ 0.25mm; 2, tensile strength ... .5JB-BC6256×250.5JB-BC6506×500.5JB-BC8608×600.5 copper clad flat steel