Hexsteel grid 1 has passed ISO9001:2000 certificate. 2 ... Shell is also known as Hexsteel grill or Hexsteel grid, provides surface framework for reinforcement of the refractory ... in Reactor vessels, Ducts, Furnaces, Cyclones, Flue gas line, etc, can largely improve the heat erosion and ... in Reactor vessels, Ducts, Furnaces, Cyclones, Flue gas line, etc, can largely improve the heat erosion and abrasion ...