Improved ductile iron material and its application in submersible electric pump structural components

Abstract

An improved ductile iron material is characterized in that, in addition to iron, it contains no more than 3.5 wt% carbon, 1-3 wt% silicon, 0.4-1.6 wt% manganese, 13-18 wt% nickel, 5-8 wt% copper, 1-3 wt% chromium, no more than 0.15 wt% sulfur, 0.01-0.09 wt% magnesium, and no more than 2 wt% other non-ferrous elements.

Claims

1. A modified ductile iron material for use in submersible electric pumps, characterized in that, in addition to iron, it contains not more than 3.5 wt% carbon, 1-3 wt% silicon, 0.4-1.6 wt% manganese, 13-18 wt% nickel, 5-8 wt% copper, 1-3 wt% chromium, not more than 0.15 wt% sulfur, 0.01-0.09 wt% magnesium, and not more than 2 wt% other non-ferrous elements; wherein, The improved ductile iron material is a cast iron material obtained after spheroidizing treatment. It consists of a vostigma matrix and a plurality of spheroidal graphite structures uniformly distributed in the vostigma matrix. Its tensile strength is ≥50 ksi, yield strength is ≥30 ksi, elongation is ≥4%, and Brinell hardness is between 130 and 205.

2. A submersible electric pump structural component, which is made of the modified ductile iron material as described in claim 1.

3. The submersible electric pump structure as described in claim 2, which is the housing of a submersible electric pump system.

4. The submersible electric pump structural component as described in claim 2, which is the rotor of a submersible electric pump system.

5. The submersible electric pump structure as described in claim 2, which is the stator of a submersible electric pump system.

6. The submersible electric pump structure as described in claim 2, which is a flow guide housing for a submersible electric pump system.

7. The submersible electric pump structural component as described in claim 2, which is a guide vane of a submersible electric pump system.

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