Methods to improve the wear resistance of stainless steel seamless pipe

To compensate not wear soft stainless steel, the friction coefficient of weakness, commonly used to improve the stainless steel plated with the drive shaft parts of the surface hardness and self-lubricating properties. Stainless steel is a surface easily passivated metal must be removed before the plating surface passivation film, stainless steel through to the oil, dipping, activation, and the pre-nickel plating processes, obtained chromium, zinc, copper, tin, precious metals, and other coatings. Studies show that the stainless steel base metal turbine, using the periodic inverted earth chrome plating, coating thickness of about 013mm, coating a metal matrix phase and a rare earth salt particles composed of a second phase, the hardness can reach 900 ~ 1000Hv, abrasion resistance of the coating the base material 25 to 28 times, than the original product life of stainless seamless steel pipe 2 to 6 times higher.

Thermal spraying is the use of certain heat the coating material is heated to a molten or semi-molten state, and by means of high velocity gas stream and the flame to be atomized and to promote the atomized spray particles to the substrate surface, depositing as having a function of the coating. Thermal spraying can provide surface wear and corrosion resistance, high temperature coating. Coating material usually present between the substrate and the combination of three ways: mechanical bonding, physical bonding, and a metallurgical bond. With the low pressure plasma spraying, high-energy, high velocity plasma spraying, HVOF technology, to further improve the performance of the coating. Porosity can be reduced to 015% to 1%; coating and the substrate bonding strength can reach 70 ~ 140MPa. Studies show that using HVOF (HVOF) and plasma spray technology (ASP) technology, respectively, in 0Cr13Ni5Mo prepared on stainless steel substrate iron-based amorphous alloy coating and iron. Based amorphous and nanocrystalline coatings studied two coating at room temperature friction and wear characteristics, the results showed that the two spraying iron-based coatings are prepared with high hardness and low porosity, dense and showed a typical layered structure, improve the coating wear layer.