阅读说明：本技术 一种高强度耐磨型不锈钢铸件及其制备工艺 (High-strength wear-resistant stainless steel casting and preparation process thereof ) 是由 王洪年 于 2020-05-08 设计创作，主要内容包括：本发明属于合金钢铸造技术领域,具体地,涉及一种高强度耐磨型不锈钢铸件及其制备工艺。本发明提供的高强度耐磨型不锈钢铸件包括以下成分,Cr：16.30~24.50%、Ni：10.00~12.75%、Mo：2.00~3.35%、C：0.01~0.03%、Fe：余量。通过射蜡、组树、制壳、脱蜡、烧结成型、熔炼浇注等多个步骤进行铸造。本发明提供的高强度耐磨型不锈钢铸件,通过对组成和工艺的调控,综合性能稳定优异,兼具优异的力学性能和耐磨性能；本发明提供的高强度耐磨型不锈钢铸件的制备工艺,操作简单便捷,步骤合理紧凑,成本经济可控,实现了高强度耐磨型不锈钢铸件的高效生产。(The invention belongs to the technical field of alloy steel casting, and particularly relates to a high-strength wear-resistant stainless steel casting and a preparation process thereof. The high-strength wear-resistant stainless steel casting provided by the invention comprises the following components in parts by weight: 16.30 to 24.50%, Ni: 10.00-12.75%, Mo: 2.00-3.35%, C: 0.01-0.03%, Fe: and (4) the balance. The casting is carried out through a plurality of steps of wax injection, tree combination, shell making, dewaxing, sintering and forming, smelting and pouring and the like. The high-strength wear-resistant stainless steel casting provided by the invention has stable and excellent comprehensive performance, excellent mechanical property and wear resistance through regulation and control of composition and process; the preparation process of the high-strength wear-resistant stainless steel casting provided by the invention is simple and convenient to operate, reasonable and compact in steps, economic and controllable in cost, and realizes efficient production of the high-strength wear-resistant stainless steel casting.)

1. The utility model provides a wear-resisting type stainless steel foundry goods of high strength which characterized in that: comprises the following components:

Cr：16.30~24.50%；

Ni：10.00~12.75%；

Mo：2.00~3.35%；

C：0.01~0.03%；

fe: and (4) the balance.

2. The high strength, wear resistant stainless steel casting of claim 1, wherein: also comprises the following components:

Mn：0.05~0.40%；

Nb：0.15~0.25%；

Si：0.10~0.25%。

3. the high strength, wear resistant stainless steel casting of claim 1, wherein: the metallographic structure is a mixed phase of austenite and ferrite, and the austenite accounts for 72-85%.

4. A process for producing a high-strength wear-resistant stainless steel casting according to any one of claims 1 to 3, characterized in that: the method comprises the following steps:

s1 shooting wax: injecting wax materials into the mold box by using a wax injection machine to form a casting model, then demolding, and placing the cast model which is removed in water for cooling;

s2 group tree: melting and bonding the casting model and the gate stick by using an electrocautery sheet;

s3 shell making: putting the casting model into silicon melt adhesive for pre-wetting, coating slurry on the surface of the casting model, and wrapping a sand layer to prepare a shell;

s4 dewaxing: heating the shell by using steam to remove wax;

s5 sintering and forming: placing the dewaxed shell in a sintering furnace, and sintering and molding;

s6 smelting and pouring: and melting the remelting stainless steel finished product ingot, and pouring into a shell for molding.

5. The process for producing a high-strength wear-resistant stainless steel casting according to claim 4, wherein: in step S1, the wax pressure is set to be 2.5-3.0 atm, and the pressure maintaining time is set to be 8-12 min.

6. The process for producing a high-strength wear-resistant stainless steel casting according to claim 4, wherein: step S3, placing the casting model into silicon melt adhesive for pre-wetting, coating surface layer slurry on the surface of the casting model, adhering surface layer sand to ensure that the wax pattern is completely coated by the sand material, and then drying; putting the dried casting model into silicon melt adhesive for pre-wetting, then coating back layer slurry to enable sand powder to soak the surface, and airing; repeating the surface coating and drying for 3-4 times to prepare a shell;

the process for producing a high-strength wear-resistant stainless steel casting according to claim 4, wherein: in step S4, the steam temperature is 170 ℃.

7. The process for producing a high-strength wear-resistant stainless steel casting according to claim 4, wherein: in step S5, the sintering temperature is: the sintering time is 1000-1100 ℃, and is as follows: 1-1.5 h.

8. The process for producing a high-strength wear-resistant stainless steel casting according to claim 4, wherein: in step S6, the mold shell is preheated before casting, and the preheating temperature is 900-1000 ℃.

Technical Field

The invention belongs to the technical field of alloy steel casting, and particularly relates to a high-strength wear-resistant stainless steel casting and a preparation process thereof.

Background

Stainless steel has excellent weak corrosion resistance and mechanical properties, and is a type of steel widely used. A stainless steel casting is a part obtained by pouring a molten stainless steel into a cavity of a mold having a shape and a size suitable for the part, and cooling and solidifying the molten stainless steel. The method has wide applicability, can manufacture castings with complex shapes, particularly complex inner cavities, and is almost free from size limitation; meanwhile, waste machine parts and cuttings can be used as raw materials, so that the cost is low; in addition, the shape and the size of the casting are close to those of the parts, so that the workload of cutting processing can be reduced, and a large amount of raw materials can be saved.

In many usage scenarios, stainless steel castings are required to have both excellent mechanical properties and excellent wear resistance, and typical usage scenarios include centrifugal pump impellers and steam turbine impellers. The mechanical properties are mainly reflected in performance parameters of tensile strength, yield strength, elongation and the like of the casting, and the wear resistance is directly related to the hardness. The properties of stainless steel are mainly determined by the microscopic state of the steel, including composition, texture, etc., and the properties can be modulated by controlling the composition and processing technology. However, in practice, it has been found that there is some contradiction between mechanical properties and wear resistance, for example, hardness can be increased by increasing the carbon and nitrogen contents, and it is very cheap, but too much carbon and nitrogen content results in reduced ductility and may result in local chromium depletion, resulting in reduced corrosion resistance. How to overcome the above contradiction to achieve excellent overall performance is a significant challenge.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a high-strength wear-resistant stainless steel casting and a preparation process thereof. The high-strength wear-resistant stainless steel casting comprises the following components:

Cr：16.30~24.50%；

Ni：10.00~12.75%；

Mo：2.00~3.35%；

C：0.01~0.03%；

fe: and (4) the balance.

Further, the high-strength wear-resistant stainless steel casting also comprises the following components:

Mn：0.05~0.40%；

Nb：0.15~0.25%；

Si：0.10~0.25%。

furthermore, the metallographic structure of the high-strength wear-resistant stainless steel casting is a mixed phase of austenite and ferrite, wherein the austenite accounts for 72-5%.

Further, the preparation process of the high-strength wear-resistant stainless steel casting comprises the following steps:

s1 shooting wax: injecting wax materials into the mold box by using a wax injection machine to form a casting model, then demolding, and placing the cast model which is removed in water for cooling;

s2 group tree: melting and bonding the casting model and the gate stick by using an electrocautery sheet;

s3 shell making: putting the casting model into silicon melt adhesive for pre-wetting, coating slurry on the surface of the casting model, and wrapping a sand layer to prepare a shell;

s4 dewaxing: heating the shell by using steam to remove wax;

s5 sintering and forming: placing the dewaxed shell in a sintering furnace, and sintering and molding;

s6 smelting and pouring: and melting the remelting stainless steel finished product ingot, and pouring into a shell for molding.

Preferably, in the above preparation process of the high-strength wear-resistant stainless steel casting, in step S1, the wax pressure is set to be 2.5 to 3.0atm, and the pressure maintaining time is set to be 8 to 12 min.

Preferably, in the above process for preparing a high-strength wear-resistant stainless steel casting, in step S3, the casting model is pre-wetted in silica sol, surface slurry is coated on the surface of the casting model, surface sand is applied to the casting model to completely coat the wax pattern with the sand, and then the casting model is dried; putting the dried casting model into silicon melt adhesive for pre-wetting, then coating back layer slurry to enable sand powder to soak the surface, and airing; repeating the surface coating and drying for 3-4 times to prepare a shell;

preferably, in the process for preparing the high-strength wear-resistant stainless steel casting, the steam temperature is 170 ℃ in step S4.

Preferably, in the above process for preparing a high-strength wear-resistant stainless steel casting, in step S5, the sintering temperature is: the sintering time is 1000-1100 ℃, and is as follows: 1-1.5 h.

Preferably, in the above preparation process of the high-strength wear-resistant stainless steel casting, in step S6, the mold shell is preheated before casting, and the preheating temperature is 900-1000 ℃.

Has the advantages that: the high-strength wear-resistant stainless steel casting provided by the invention has stable and excellent comprehensive performance, excellent mechanical property and wear resistance through regulation and control of composition and process; the preparation process of the high-strength wear-resistant stainless steel casting provided by the invention is simple and convenient to operate, reasonable and compact in steps, economic and controllable in cost, and realizes efficient production of the high-strength wear-resistant stainless steel casting.

Detailed Description