阅读说明：本技术 耐油污不锈钢的渗氮处理系统及其处理方法 (Nitriding treatment system and nitriding treatment method for oil-stain-resistant stainless steel ) 是由 马大成 张震宇 陈金梁 肖亚楠 陈德财 于 2020-04-30 设计创作，主要内容包括：本发明揭示了一种耐油污不锈钢的渗氮处理系统及其处理方法,用于耐油污不锈钢的生产,包括与控制系统电连接、用于不锈钢渗氮处理的渗氮炉,渗氮炉的进料端与真空热处理炉相接、出料端与超声清洗机相接,真空热处理炉用于不锈钢的渗氮预热,超声清洗机用于不锈钢的渗氮后清洗,依序设置的真空热处理炉、渗氮炉与超声清洗机均受控制系统进行自动化控制。本发明结构紧凑,渗氮工艺简单,渗氮处理成本较低,实用性佳,可实现耐油污不锈钢的连续化、自动化生产；经本发明渗氮处理的不锈钢具有优良的耐磨性和耐腐蚀性的同时,兼具疏油、耐油污的特性,有利于推广应用,具有市场竞争力及使用价值。(The invention discloses a nitriding treatment system and a nitriding treatment method for oil-stain-resistant stainless steel, which are used for producing the oil-stain-resistant stainless steel and comprise a nitriding furnace which is electrically connected with a control system and used for nitriding the stainless steel, wherein the feeding end of the nitriding furnace is connected with a vacuum heat treatment furnace, the discharging end of the nitriding furnace is connected with an ultrasonic cleaning machine, the vacuum heat treatment furnace is used for preheating the nitriding of the stainless steel, the ultrasonic cleaning machine is used for cleaning the nitrided stainless steel, and the vacuum heat treatment furnace, the nitriding furnace and the ultrasonic cleaning machine which are sequentially arranged are all automatically controlled by the control system. The invention has compact structure, simple nitriding process, lower nitriding treatment cost and good practicability, and can realize continuous and automatic production of the oil-stain-resistant stainless steel; the stainless steel subjected to nitriding treatment has excellent wear resistance and corrosion resistance, has the characteristics of oleophobicity and oil stain resistance, is favorable for popularization and application, and has market competitiveness and use value.)

1. A nitriding treatment system of resistant oily stainless steel for resistant oily stainless steel's production, its characterized in that: the nitriding treatment system comprises a nitriding furnace which is electrically connected with a control system and is used for nitriding stainless steel, the feeding end of the nitriding furnace is connected with a vacuum heat treatment furnace, the discharging end of the nitriding furnace is connected with an ultrasonic cleaning machine, the vacuum heat treatment furnace is used for preheating the nitriding of the stainless steel, the ultrasonic cleaning machine is used for cleaning the nitrided stainless steel, and the vacuum heat treatment furnace, the nitriding furnace and the ultrasonic cleaning machine which are arranged in sequence are automatically controlled by the control system.

2. The salt bath nitriding system of claim 1, wherein the control system is an MES system, a P L C software system or an industrial control computer.

3. The salt bath nitriding system of claim 1, wherein: the stainless steel is martensitic, ferritic, austenitic-ferritic, or precipitation-hardened stainless steel.

4. A treatment method using a nitriding treatment system of the oil resistant stainless steel according to any one of claims 1 to 3, comprising the steps of:

step S1, nitrogen substitution: placing stainless steel in a nitriding furnace, introducing nitrogen into the nitriding furnace for 5-15 min, and displacing air in a pipeline in the nitriding furnace;

step S2, heating pre-nitriding: heating the nitriding furnace to 600-650 deg.C, the ammonia decomposition rate is 65-80%, and the ammonia introducing quantity is 3m³/h-5m³Treating the stainless steel for 6-10 h under the condition of the/h;

step S3, nitriding: the temperature in the nitriding furnace is maintained at 600-650 ℃, the ammonia decomposition rate is 75-85 percent, and the ammonia introducing amount is 1m³/h-4m³Treating the stainless steel for 1-3 h under the condition of/h;

step S4, nitrogen reduction treatment: the temperature in the nitriding furnace is 580-620 ℃, the ammonia decomposition rate is 85-90 percent, and the ammonia introducing amount is 1m³/h-2m³Treating the stainless steel for 1-2 h under the condition of/h;

step S5, cooling in nitrogen atmosphere: and cooling the temperature to 80-150 ℃ along with the nitriding furnace under the protection of nitrogen, coating an oleophobic coating, and taking out of the nitriding furnace for air cooling to finish nitriding and nitriding of the oil-stain-resistant stainless steel.

5. A nitriding treatment method of oil resistant stainless steel according to claim 3, characterized in that: the flow rate of nitrogen introduced in step S1 is not more than 5 m/S.

6. The method of claim 3The nitriding treatment method of the oil-stain resistant stainless steel is characterized by comprising the following steps: in step S2, the ammonia decomposition rate was 80% and the ammonia flow rate was 5m at 650 DEG C³The stainless steel is treated for 6h under the condition of/h.

7. A nitriding treatment method of oil resistant stainless steel according to claim 3, characterized in that: in step S3, the ammonia decomposition rate was 75% and the ammonia flow rate was 1m at 600 ℃³The stainless steel is treated for 3 hours under the condition of/h.

8. A nitriding treatment method of oil resistant stainless steel according to claim 3, characterized in that: in step S3, the ammonia decomposition rate was 85% and the ammonia flow rate was 4m at 650 DEG C³The stainless steel is treated for 1h under the condition of/h.

9. A nitriding treatment method of oil resistant stainless steel according to claim 3, characterized in that: at a temperature of 580 deg.C, an ammonia decomposition rate of 85% and an ammonia flow of 1m in step S4³The stainless steel is treated for 2 hours under the condition of/h.

10. A nitriding treatment method of oil resistant stainless steel according to claim 3, characterized in that: the rated power of the nitriding furnace is 35-80 kw.

Technical Field

The invention relates to a nitriding treatment system and a nitriding treatment method, in particular to a nitriding treatment system and a nitriding treatment method of oil-stain-resistant stainless steel, and belongs to the field of metal material processing.

Background

Nitriding treatment refers to a chemical heat treatment process for making nitrogen atoms permeate into the surface layer of a workpiece in a certain medium at a certain temperature, and common nitriding processes include gas nitriding, liquid nitriding and ion nitriding. The product after nitriding treatment has the characteristics of excellent wear resistance, fatigue resistance, corrosion resistance, high temperature resistance and oil stain resistance.

The stainless steel has good toughness, easy processing property, weldability and heat resistance, is widely applied, and is especially used in kitchen products, especially large kitchen kitchens. However, the kitchen is heavily polluted by oil, the service life of the stainless steel is shortened due to long-term oil corrosion, and the stainless steel has the defects of poor oil repellency, abrasion resistance and fatigue resistance, so the nitriding treatment of the stainless steel is an effective surface strengthening method. The conventional nitriding method is complex in process and high in treatment cost, and most importantly, the corrosion resistance of the stainless steel is damaged, because the stainless steel is easy to deform due to high-temperature treatment, chromium atoms in the austenitic stainless steel are easy to combine with nitrogen atoms to generate chromium nitride which is firstly precipitated on austenite grain boundaries of a nitriding layer to form a net shape, a compact oxidation film on the surface of the stainless steel is damaged, the rust prevention mechanism of the stainless steel is damaged, and the oil stain resistance of the stainless steel is further reduced. Therefore, how to design a nitriding treatment system and a nitriding treatment method thereof capable of preparing stainless steel with oil stain resistance, wear resistance and corrosion resistance based on the prior art becomes a technical problem to be solved by those skilled in the art.

Disclosure of Invention

Aiming at the defects or improvement requirements of the prior art, the invention provides a nitriding treatment system and a nitriding treatment method of oil-stain-resistant stainless steel, which have the advantages of compact structure, simple nitriding process, lower nitriding treatment cost and good practicability; the stainless steel treated by nitriding of the invention has good oleophobic property and oil stain resistance.

The purpose of the invention is realized by the following technical scheme:

according to one aspect of the invention, a nitriding treatment system of oil-stain-resistant stainless steel is provided and used for producing the oil-stain-resistant stainless steel, the nitriding treatment system comprises a nitriding furnace which is electrically connected with a control system and used for nitriding the stainless steel, the feeding end of the nitriding furnace is connected with a vacuum heat treatment furnace, the discharging end of the nitriding furnace is connected with an ultrasonic cleaning machine, the vacuum heat treatment furnace is used for preheating the nitriding of the stainless steel, the ultrasonic cleaning machine is used for cleaning the nitrided stainless steel, and the vacuum heat treatment furnace, the nitriding furnace and the ultrasonic cleaning machine which are sequentially arranged are automatically controlled by the control system.

Further, the control system is an MES system, a P L C software system or an industrial personal computer.

Further, the stainless steel is a martensitic steel, a ferritic steel, an austenitic-ferritic stainless steel, or a precipitation hardening stainless steel.

According to another aspect of the present invention, there is provided a treatment method of the nitriding treatment system of the above-mentioned oil-resistant stainless steel, comprising the steps of:

step S1, nitrogen substitution: placing stainless steel in a nitriding furnace, introducing nitrogen into the nitriding furnace for 5-15 min, and displacing air in a pipeline in the nitriding furnace;

step S2, heating pre-nitriding: heating the nitriding furnace to 600-650 deg.C, the ammonia decomposition rate is 65-80%, and the ammonia introducing quantity is 3m³/h-5m³Treating the stainless steel for 6-10 h under the condition of the/h;

step S3, nitriding: the temperature in the nitriding furnace is maintained at 600-650 ℃, the ammonia decomposition rate is 75-85 percent, and the ammonia introducing amount is 1m³/h-4m³Treating the stainless steel for 1-3 h under the condition of/h;

step S4, nitrogen reduction treatment: the temperature in the nitriding furnace is 580-620 ℃, the ammonia decomposition rate is 85-90 percent, and the ammonia introducing amount is 1m³/h-2m³Treating the stainless steel for 1-2 h under the condition of/h;

step S5, cooling in nitrogen atmosphere: and cooling the temperature to 80-150 ℃ along with the nitriding furnace under the protection of nitrogen, coating an oleophobic coating, and taking out of the nitriding furnace for air cooling to finish nitriding and nitriding of the oil-stain-resistant stainless steel.

Further, the flow rate of nitrogen introduced in step S1 is not more than 5 m/S.

Further, in step S2, the ammonia decomposition rate was 80% and the ammonia flow rate was 5m at 650 ℃³The stainless steel is treated for 6h under the condition of/h.

Further, in step S3, the ammonia decomposition rate was 75% and the ammonia flow rate was 1m at 600 ℃³The stainless steel is treated for 3 hours under the condition of/h.

Further, in step S3, the ammonia decomposition rate was 85% and the ammonia flow rate was 4m at 650 ℃³The stainless steel is treated for 1h under the condition of/h.

Further, in step S4, the ammonia decomposition rate was 85% and the ammonia amount was 1m at a temperature of 580 ℃³The stainless steel is treated for 2 hours under the condition of/h.

Furthermore, the rated power of the nitriding furnace is 35-80 kw.

Compared with the prior art, the technical scheme of the invention has the following advantages:

according to the nitriding treatment system and the nitriding treatment method for the oil-stain-resistant stainless steel, provided by the invention, the nitriding treatment system is compact in structure, convenient and fast to operate, simple in nitriding process, lower in nitriding treatment cost and good in practicability, and can realize continuous and automatic production of the oil-stain-resistant stainless steel; the stainless steel subjected to nitriding treatment has excellent wear resistance and corrosion resistance, has the characteristics of oleophobicity and oil stain resistance, is favorable for popularization and application, and has market competitiveness and use value.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the specific embodiments. The drawings are only for purposes of illustrating the particular embodiments and are not to be construed as limiting the invention. In the drawings:

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. Examples of the embodiments are illustrated in the accompanying drawings, and specific embodiments described in the following embodiments of the invention are provided as illustrative of the embodiments of the invention only and are not intended to be limiting of the invention.

The invention provides a nitriding treatment system of oil-stain-resistant stainless steel, which is used for producing the oil-stain-resistant stainless steel, and further, the stainless steel is martensitic steel, ferritic steel, austenitic-ferritic stainless steel or precipitation hardening stainless steel, the nitriding treatment system comprises a nitriding furnace which is electrically connected with a control system and is used for nitriding the stainless steel, the feeding end of the nitriding furnace can be connected with a vacuum heat treatment furnace or other preheating furnaces, the discharging end of the nitriding furnace can be connected with an ultrasonic cleaning machine or a continuous cleaning machine, the vacuum heat treatment furnace is used for nitriding and preheating the stainless steel, the ultrasonic cleaning machine is used for cleaning the stainless steel after nitriding, the vacuum heat treatment furnace, the nitriding furnace and the ultrasonic cleaning machine which are sequentially arranged are automatically controlled by the control system, and before nitriding treatment, all control parameters in the nitriding treatment process are input into the control system, and the control system can be an MES system or a P L C software system or an industrial control computer.

The nitriding treatment system is compact in structure, convenient and fast to operate, simple in nitriding process and low in nitriding treatment cost, can realize continuous and automatic production of the oil-stain-resistant stainless steel, improves nitriding treatment efficiency, reduces treatment cost of manpower and the like, and is good in practicability.

The invention also provides a nitriding treatment method of the nitriding treatment system of the oil-resistant stainless steel, which comprises the following steps: