阅读说明：本技术 高铬合金铸件的制备方法 (Preparation method of high-chromium alloy casting ) 是由 朱文星 朱万军 于 2018-07-26 设计创作，主要内容包括：本发明属于铸件制造领域,具体涉及一种高铬合金铸件的制备方法包括下述步骤：1)原料准备；2)原料熔炼,温度为1400-1500摄氏度；3)浇注,浇注温度为1100-1200摄氏度；浇注后铸件充分凝固25-35min；4)退火,冷却后的铸件进行打磨加工后加热到1000-1200℃,保温10-15min；5)淬火,将铸造件加热至780-830℃进行淬火；淬火时间为7-8h,之后自然冷却；6)回火,温度为260-280℃。本申请通过高铬合金的合理配比,得到的高铬合金铸件的硬度高,HPC能够达到70以上,同时,冲击韧性强,冲击值达到15J/cm2。(The invention belongs to the field of casting manufacturing, and particularly relates to a preparation method of a high-chromium alloy casting, which comprises the following steps: 1) preparing raw materials; 2) smelting raw materials at 1400 ℃ and 1500 ℃; 3) pouring, wherein the pouring temperature is 1100-; fully solidifying the cast for 25-35min after pouring; 4) annealing, polishing the cooled casting, heating to 1000-1200 ℃, and preserving heat for 10-15 min; 5) quenching, namely heating the casting to 780-830 ℃ for quenching; the quenching time is 7-8h, and then the steel plate is naturally cooled; 6) the tempering temperature is 260-280 ℃. This application is through the rational ratio of high chromium alloy, and the hardness of the high chromium alloy foundry goods that obtains is high, and HPC can reach more than 70, and simultaneously, impact toughness is strong, and the impact value reaches 15J/cm 2.)

1. The preparation method of the high-chromium alloy casting is characterized by comprising the following steps of:

1) preparing raw materials: 2.0 to 3.3 percent of C, 1.75 to 2.2 percent of Si, 1.3 to 2.6 percent of Mn, 10 to 13 percent of Cr, 0.3 to 1.0 percent of Mo, 0.25 to 0.5 percent of Cu, less than or equal to 0.1 percent of s, less than or equal to 0.1 percent of P, and the balance of Fe; 2) smelting raw materials at 1400 ℃ and 1500 ℃; 3) pouring, wherein the pouring temperature is 1100-; fully solidifying the cast for 25-35min after pouring; 4) annealing, polishing the cooled casting, heating to 1000-1200 ℃, and preserving heat for 10-15 min; 5) quenching, namely heating the casting to 780-830 ℃ for quenching; the quenching time is 7-8h, and then the steel plate is naturally cooled; 6) the tempering temperature is 260-280 ℃.

2. A method of producing a high chromium alloy casting according to claim 1, wherein the raw material of step 1) comprises the following components: 2.5 percent of C, 2.0 percent of Si, 2.1 percent of Mn, 11 percent of Cr, 0.8 percent of Mo, 0.4 percent of Cu, less than or equal to 0.1 percent of s, less than or equal to 0.1 percent of P, and the balance of Fe.

3. The method for preparing a high-chromium alloy casting according to claim 1, wherein in the step 2), vacuum melting is performed during melting, the vacuum pressure is 1.6-2.8Pa, and the melting time is 35-50 min.

Technical Field

The invention belongs to the field of casting manufacturing, and particularly relates to a preparation method of a high-chromium alloy casting.

Background

The wear-resistant material is reformed and opened for more than 30 years, vast scientific and technological workers in China are combined with production practice, and various novel wear-resistant materials are developed according to the specific working conditions and domestic resource conditions of equipment wear in China. Mainly divided into modified high manganese steel, medium manganese steel and ultrahigh manganese steel series; high, medium and low carbon wear resistant alloy steel series; chromium series wear-resistant white cast iron series; manganese series and boron series wear-resistant white cast iron and martensite and bainite wear-resistant nodular cast iron; bimetal composite wear-resistant materials produced by different methods; surface-treated wear-resistant materials, and the like.

Wherein, the high-chromium cast iron is a third-generation wear-resistant material developed after common white cast iron and nickel hard cast iron. Because of the characteristics of the self-organization of the high-chromium cast iron, the high-chromium cast iron has the performances of higher toughness, high-temperature strength, heat resistance, wear resistance and the like compared with the common cast iron. High-chromium cast iron has been honored as the most excellent wear-resistant material of the present generation and is increasingly widely used.

Disclosure of Invention

The invention aims to provide a preparation method of a high-chromium alloy casting.

In order to achieve the purpose, the invention adopts the following technical scheme:

a preparation method of a high-chromium alloy casting comprises the following steps:

1) preparing raw materials: 2.0 to 3.3 percent of C, 1.75 to 2.2 percent of Si, 1.3 to 2.6 percent of Mn, 10 to 13 percent of Cr, 0.3 to 1.0 percent of Mo0.3, 0.25 to 0.5 percent of Cu, less than or equal to 0.1 percent of s, less than or equal to 0.1 percent of P, and the balance of Fe; 2) smelting raw materials at 1400 ℃ and 1500 ℃; 3) pouring, wherein the pouring temperature is 1100-; fully solidifying the cast for 25-35min after pouring; 4) annealing, polishing the cooled casting, heating to 1000-1200 ℃, and preserving heat for 10-15 min; 5) quenching, namely heating the casting to 780-830 ℃ for quenching; the quenching time is 7-8h, and then the steel plate is naturally cooled; 6) the tempering temperature is 260-280 ℃.

Preferably, the raw material of the step 1) comprises the following components: 2.5 percent of C, 2.0 percent of Si, 2.1 percent of Mn, 11 percent of Cr, 0.8 percent of Mo0.8 percent of Cu, less than or equal to 0.1 percent of s, less than or equal to 0.1 percent of P, and the balance of Fe.

Preferably, vacuum melting is carried out in the melting process in the step 2), the vacuum pressure is 1.6-2.8Pa, and the melting time is 35-50 min.

Compared with the prior art, the invention has the beneficial effects that:

according to the high-chromium alloy, the content of the precious metal Mo is reduced and the cost is reduced through reasonable proportioning of the high-chromium alloy, meanwhile, the tensile strength and the impact toughness of the alloy are enhanced through increasing of Si, the quantity of martensite can be increased through increasing of the content of Mn, and the wear resistance of a casting is improved; the addition of Cu can separate out fine particles in the cooling process, and the strength of the casting is improved. In the preparation process of the application, the components are mixed more uniformly by vacuum mixing, and meanwhile, the tempering temperature is reduced, so that the transformation of carbides can be inhibited, the precipitation of the carbides is reduced, and the stability of the residual austenite is improved. The high-chromium alloy casting obtained by the method has high hardness, HPC can reach more than 70, and meanwhile, the high-chromium alloy casting has strong impact toughness and an impact value of 15J/cm 2.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the following preferred embodiments.