METAL WATER TANK, OIL TANK MATERIAL: Hot-Rolled Sheet Steel ISO 9001 APPROVED CUSTOM-MADE, OEM PRODUCT NAME: METAL water tankPRODUCT MATERIAL: Hot-Rolled Sheet Steel Our factory offers OEM service for all kind of TANKS. Our faory has large-scale stretcher, punching machine, pressing equipment, sheet metal equipment. We can even weld in many ways: argon arc welding, CO2 arc welding, seam welding, ...