Method for processing spindly shaft by utilizing 17-4PH stainless steel

Abstract

The invention relates to a method for processing a spindly shaft by utilizing 17-4PH stainless steel, which comprises the following steps of: taking the 17-4PH stainless steel as a raw material; putting the raw material in a vacuum melting furnace so as to carry out vacuum melting; pouring the melted solution after vacuum melting furnace into a mould which is arranged in a vacuum chamber and is provided with a cylindrical cavity so as to form a ingot casting; forging; hot rolling; hot drawing; cold drawing and age-hardening. Due to the adoption of the technical scheme, the invention provides the method for processing the spindly shaft by utilizing the 17-4PH stainless steel, a metallographic structure of the 17-4PH stainless steel is still kept in an austenite state in a processing process, and the spindly shaft is processed through cold drawing and forming, so that the processed spindly shaft has high strength, high hardness and good deformability.

Description

technical field [0001] The invention relates to a method for processing a slender shaft with stainless steel, in particular to a method for processing a slender shaft with 17-4PH stainless steel. Background technique [0002] 17-4PH is a martensitic precipitation hardening stainless steel, its chemical composition mass percentage is: C≤0.07, Si≤1.0, Mn≤1.0, Cr: 15.5-17.5, Ni: 3.0-5.0, Cu: 2.6-4.6 , Nb: 0.15-0.45, S ≤ 0.03, P ≤ 0.035, this material is cheap, and it is generally used in components that bear heavy loads, such as wrenches, high-power shafts, etc. The usual molding method is to cast a blank, and then mechanically Processed to the size required by the design, the metallographic structure of the finished product is martensite, and its performance characteristics are high strength and high hardness. However, its deformation ability is poor. For the processing of slender shafts, this processing method is obviously impossible. Even if forging and rolling are added in...

AI Technical Summary

Problems solved by technology

[0002] 17-4PH is a martensitic precipitation hardening stainless steel, its chemical composition mass percentage is: C≤0.07, Si≤1.0, Mn≤1.0, Cr: 15.5-17.5, Ni: 3.0-5.0, Cu: 2.6-4.6 , Nb: 0.15-0.45, S ≤ 0.03, P ≤ 0.035, this material is cheap, and it is generally used in components that bear heavy loads, such as wrenches, high-power shafts, etc. The usual molding method is to cast a blank, and then mechanically Processed to the size required by the design, the metallographic structure of the finished product is martensite, and its performance characteristics are high strength and high hardness. However, its deformation ability is poor. For the processing of slender shafts, this processing method is obviously impossible. Even if forging and rolling are added in the middle, the final grinding cannot guarantee the accuracy of the shaft. Especially in oil well operations, the electric submersible pump is a multi-stage pump, and its shaft is generally slender. All sections of the shaft need to bear a certain radial load, which puts forward high requirements for the strength of the shaft, especially in today when the world's oil resources are seriously lacking, in order to obtain more oil, people have to use Oil is excavated deep in the earth's crust, which accelerates the depth of submerged oil, and thus puts forward higher and higher requirements for the length and strength of the shaft. In the past, people generally used monel K500 material to process the shaft, but this material is very expensive. , therefore, the method of machining slender shafts through 17-4PH stainless steel has become an urgent problem in the market

Images