... diameter-1830mm,2750mm,3670mm,4600mm,5500mm,with half-ring,1-ring,2-ring,3-ring and different capacities from 3MT to 60MT ... domestic famous steel factories.All steel plates are passivation treated,with zn-coating thickness no less than 275 gram per square meter ... thickness range from 1.0mm to 3.0mm,fit for different thickness requirement.All steel plate joints are fixed by high ...