Maraging steel, method for preparing maraging steel, and electronic device

Abstract

Embodiments of this application provide a maraging steel, a method for preparing a maraging steel, and an electronic device. The maraging steel includes the following alloy elements: Co, Mo, and Ti. By weight percentage, a content of Co ranges from 12 wt % to 17 wt %, a content of Mo ranges from 6 wt % to 8 wt %, and a content of Ti ranges from 0.4 wt % to 1.5 wt %. The maraging steel further includes the following alloy elements: Ni, Al, Fe, and an impurity element. By weight percentage, a content of Ni ranges from 15 wt % to 18 wt %, Al≤0.3 wt %, and the remainder is Fe and the impurity element. Embodiments of this application provide the maraging steel, the method for preparing a maraging steel, and the electronic device, so that the maraging steel can have both a high strength and high plasticity.

What is claimed is: 
     
         1 . A maraging steel, wherein the maraging steel comprises the following alloy elements: Co, Mo, and Ti; and by weight percentage, a content of Co ranges from 12 wt % to 17 wt %, a content of Mo ranges from 6 wt % to 8 wt %, and a content of Ti ranges from 0.4 wt % to 1.5 wt %. 
     
     
         2 . The maraging steel according to  claim 1 , wherein the maraging steel further comprises the following alloy elements: Ni, Al, Fe, and an impurity element; and by weight percentage, a content of Ni ranges from 15 wt % to 18 wt %, Al≤0.3 wt %, and the remainder is Fe and the impurity element. 
     
     
         3 . The maraging steel according to  claim 2 , wherein the impurity element comprises one or more of the following elements: C, Mn, O, S, N, and P; and by weight percentage, a content of the impurity element is: C≤0.01 wt %, Mn≤0.01 wt %, total oxygen T.O content≤0.0015 wt %, S≤0.0020 wt %, N≤0.0015 wt %, and P≤0.0050 wt %. 
     
     
         4 . The maraging steel according to  claim 1 , wherein a tensile strength of the maraging steel is greater than or equal to 2500 MPa, and a yield strength is greater than or equal to 2500 MPa. 
     
     
         5 . The maraging steel according to  claim 1 , wherein an elongation rate of the maraging steel is greater than or equal to 12%. 
     
     
         6 . The maraging steel according to  claim 1 , wherein a reduction of area of the maraging steel is greater than or equal to 60%. 
     
     
         7 . A preparation method for preparing a maraging steel, wherein the preparation method comprises:
 weighing, based on a designed composition, metallic single-element raw materials corresponding to alloy elements, and smelting and casting the metallic single-element raw materials;   performing a plurality of forgings on a steel ingot obtained through the casting, wherein an overall forging ratio obtained after the plurality of forgings is greater than or equal to 10; and   performing a deep cryogenic treatment and an aging treatment on the steel ingot obtained through the plurality of forgings.   
     
     
         8 . The preparation method according to  claim 7 , wherein a temperature of a last forging process in the plurality of forgings ranges from 750° C. to 1050° C. 
     
     
         9 . The preparation method according to  claim 7 , wherein a temperature of the deep cryogenic treatment is lower than −73° C., and is maintained for 1 h to 10 h. 
     
     
         10 . The preparation method according to  claim 7 , wherein a heating temperature of the aging treatment ranges from 450° C. to 530° C., and is maintained for 3 h to 10 h. 
     
     
         11 . The preparation method according to  claim 7 , wherein the smelting the metallic single-element raw materials comprises:
 smelting the metallic single-element raw materials in one or more of the following manners:   converter smelting, out-of-furnace refining, vacuum induction melting, vacuum arc remelting, and electro-slag remelting.   
     
     
         12 . The preparation method according to  claim 7 , wherein before the performing a plurality of forgings on a steel ingot obtained through the casting, the preparation method further comprises:
 performing a homogenization treatment on the steel ingot obtained through the casting, wherein a temperature of the homogenization treatment ranges from 1170° C. to 1230° C.   
     
     
         13 . An electronic device, comprising one or more parts made of a maraging steel, wherein the maraging steel comprises the following alloy elements: Co, Mo, and Ti; and by weight percentage, a content of Co ranges from 12 wt % to 17 wt %, a content of Mo ranges from 6 wt % to 8 wt %, and a content of Ti ranges from 0.4 wt % to 1.5 wt %. 
     
     
         14 . The electronic device according to  claim 13 , wherein the maraging steel further comprises the following alloy elements: Ni, Al, Fe, and an impurity element; and by weight percentage, a content of Ni ranges from 15 wt % to 18 wt %, Al≤0.3 wt %, and the remainder is Fe and the impurity element. 
     
     
         15 . The electronic device according to  claim 14 , wherein the impurity element comprises one or more of the following elements: C, Mn, O, S, N, and P; and by weight percentage, a content of the impurity element is: C≤0.01 wt %, Mn≤0.01 wt %, a total oxygen T.O content≤0.0015 wt %, S≤0.0020 wt %, N≤0.0015 wt %, and P≤0.0050 wt %. 
     
     
         16 . The electronic device according to  claim 13 , wherein a tensile strength of the maraging steel is greater than or equal to 2500 MPa, and a yield strength is greater than or equal to 2500 MPa. 
     
     
         17 . The electronic device according to  claim 13 , wherein an elongation rate of the maraging steel is greater than or equal to 12%. 
     
     
         18 . The electronic device according to  claim 13 , wherein a reduction of area of the maraging steel is greater than or equal to 60%. 
     
     
         19 . The electronic device according to  claim 14 , wherein a tensile strength of the maraging steel is greater than or equal to 2500 MPa, and a yield strength is greater than or equal to 2500 MPa. 
     
     
         20 . The electronic device according to  claim 15 , wherein an elongation rate of the maraging steel is greater than or equal to 12%.