By adopting self-developed welding equipments, Pourin offers high quality overlay composite tube which needed under special working conditions, such as cladding austenitic stainless steel, nickel base alloy and so on. The overlay composite tube has smooth surface and high flatness with a low out-of-roundness after the surface treatment, which are suitable for all kinds of boilers and equipment with high installation accuracy. The overlay composite tube can be mass produced or single customized which depends on client’s requirements. The material and specification of base metal as well as the material and thickness of cladding metal can be developed according to customer’s needs.