Wear-resistant and corrosion-resistant stainless steel material for pump and preparation method thereof

Abstract

The invention provides a wear-resistant and corrosion-resistant stainless steel material for a pump. The wear-resistant and corrosion-resistant stainless steel material comprises the following chemical components including, by mass, less than or equal to 0.04% of C, 0.3%-0.5% of Si, 1.0%-1.5% of Mn, 24%-26% of Cr, 4.0%-5.0% of Ni, 2.0%-3.0% of Mo, 0.5%-1.0% of Co, 1.5%-2.5% of W, 1.0%-1.5% of Nb, less than or equal to 0.04% of P and S, 0.15%-0.25% of N and the balance Fe. A casting made of the stainless steel material is free of defects such as subsurface pores and cracks, good in casting performance, excellent in corrosion resistance and wear resistance and suitable for being used as a preparation material of a limestone (lime)-gypsum method desulfurization slurry pump which is large in operating condition change and has harsh wear resistance and corrosion resistance requirements, and the service life of a pump type product reaches two years or longer.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a wear-resistant and corrosion-resistant stainless steel material for pumps and a preparation method thereof. Background technique [0002] Limestone (lime)-gypsum desulfurization slurry pump, the actual working conditions vary greatly, in order to prevent the huge water hammer effect of the liquid, the pump body is required to be impact resistant; the conveying medium contains fine particles, and the wear resistance is high; the chloride ion in the medium is high , unstable temperature, and demanding corrosion resistance. General materials are difficult to meet the requirements of use. Some desulfurization pumps in the prior art use C4 steel, Cr30A, 2605N and other stainless steel materials, and the service life is only 5, 6 months, or even 2-3 months. [0003] Frequent replacement not only brings huge usage costs to customers, but also directly affects production effic...

AI Technical Summary

Problems solved by technology

General materials are difficult to meet the requirements of use. Some desulfurization pumps in the prior art use C4 steel, Cr30A, 2605N and other stainless steel materials, and the service life is only 5, 6 months, or even 2-3 months.

[0003] Frequent replacement not only brings huge cost to customers, but also directly affects production efficiency

[0004] Nitrogen element needs to be added to stainless steel materials in the prior art. Nitrogen element is a powerful element that promotes the formation of austenite, and its action force is about 30 times that of nickel, which can significantly increase corrosion resistance, strengthen material strength, and increase wear resistance However, because nitrogen is volatile, it is difficult to add, the control is not good, and it is easy to form casting defects such as subcutaneous pores and cracks

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