Changsha Zoomlian Pump Co., Ltd. 长沙中联泵业股份有限公司

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    How should the materials for the components be selected when purchasing a self-balancing multistage centrifugal pump?

    Publication Date:

    2025-09-29

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    In the salt chemical industry, media with high solid content pose particularly significant challenges in terms of pump wear, clogging, and corrosion. The self-balancing multistage centrifugal pump addresses these issues by eliminating the conventional Multi-stage pump The balance disc mechanism within, and employing symmetry Impeller The design achieves axial force self-balancing, making it particularly suitable for harsh operating conditions. At its core, the design concept focuses on "wear resistance, anti-clogging, corrosion resistance, and vibration reduction," ensuring reliable long-term operation even with media containing high solid content. In this article, we introduce Changsha, the manufacturer of chemical pumps. China United Pump Industry We will share how to select the materials for components when purchasing self-balancing multistage centrifugal pumps in the salt chemical industry.

     

    Self-balanced multistage pump

     

    The primary failure factors for high-solids media in the salt chemical industry include particle erosion wear and salt solution corrosion; therefore, selecting materials that simultaneously exhibit both abrasion resistance and corrosion resistance is crucial.

     

    High-chromium cast iron (such as Cr26 ): Chromium content exceeds 26% , forming a dense Cr ₂ O The oxide film exhibits excellent resistance to salt solution corrosion, with a hardness that can reach HRC60 Above, suitable for medium- to low-solid content (≤ 15% ) of salt slurry transportation.

    Duplex stainless steel (such as 2205 ） + Tungsten carbide coating: Suitable for high solids content (> 15% ) or high-flow scenarios, duplex steel (austenitic + Ferrite possesses excellent resistance to chloride ion corrosion and is surface-sprayed. 3-5mm Tungsten carbide (hardness HRC70 (Above), further enhancing wear resistance, making it suitable for brine transfer with a high concentration of salt crystallization particles.

    Hastelloy Alloy C276 : Designed for extreme operating conditions, such as environments containing fluorine-containing salt media, it offers excellent performance in highly corrosive settings, though at a higher cost.

    Shaft material: Selected 42CrMo Alloy quenched and tempered steel (with surface chrome plating or nitriding treatment), enhancing surface hardness to HV800 Above, enhancing scratch and abrasion resistance.

    Shaft sleeve material: Made of silicon carbide SiC ) or silicon nitride ceramics, which effectively reduce shaft wear caused by particle jamming due to their high hardness and low coefficient of friction.

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