阅读说明：本技术 一种合金无缝钢管的表面加工处理工艺 (Surface processing treatment process of alloy seamless steel pipe ) 是由 张培丽 陈强 曹勇 顾欢弟 于 2020-06-22 设计创作，主要内容包括：本发明属于合金钢管表面处理领域,具体公开了一种合金无缝钢管的表面加工处理工艺,包括如下步骤：对钢管外表面清洗处理,外表面清洗处理包括除油处理、氧化物处理与抛光处理；对清洗后的钢管进行一次防腐防锈处理,一次防腐防锈处理包括磷化处理与防锈涂覆处理；对一次防锈处理后的钢管进行二次防腐防锈处理,二次防腐防锈处理后进行烘干,烘干后完成表面处理工艺。本发明采用多种表面处理手段复合运用的方式,相比于现有机械或化学单一处理工艺,具有安全、环保、产品外观质量好、表面光洁度高、耐腐蚀性好等优点。(The invention belongs to the field of alloy steel pipe surface treatment, and particularly discloses a surface processing treatment process of an alloy seamless steel pipe, which comprises the following steps: cleaning the outer surface of the steel pipe, wherein the cleaning treatment of the outer surface comprises oil removal treatment, oxide treatment and polishing treatment; performing primary anticorrosion and antirust treatment on the cleaned steel pipe, wherein the primary anticorrosion and antirust treatment comprises phosphating treatment and antirust coating treatment; and (3) carrying out secondary anticorrosion and antirust treatment on the steel pipe subjected to the primary antirust treatment, drying the steel pipe after the secondary anticorrosion and antirust treatment, and finishing the surface treatment process after drying. The invention adopts a mode of composite application of a plurality of surface treatment means, and has the advantages of safety, environmental protection, good product appearance quality, high surface smoothness, good corrosion resistance and the like compared with the existing mechanical or chemical single treatment process.)

1. The surface processing treatment process of the alloy seamless steel pipe is characterized by comprising the following steps of:

s1: cleaning the outer surface of the steel pipe, wherein the cleaning treatment of the outer surface comprises oil removal treatment, oxide treatment and polishing treatment;

s2: performing primary anticorrosion and antirust treatment on the cleaned steel pipe, wherein the primary anticorrosion and antirust treatment comprises phosphating treatment and antirust coating treatment;

s3: and (3) carrying out secondary anticorrosion and antirust treatment on the steel pipe subjected to the primary antirust treatment, drying the steel pipe after the secondary anticorrosion and antirust treatment, and finishing the surface treatment process after drying.

2. The surface processing treatment process of the alloy seamless steel pipe as claimed in claim 1, wherein the outer surface cleaning treatment in the step S1 comprises the steps of: s11: preparing an oil removal treatment solution and a pickling solution; s12: immersing the steel pipe into a container containing an oil removal treatment solution, and cleaning oil stains on the surface of the steel pipe by using the oil removal treatment solution; s13: immersing the steel pipe in a container containing pickling solution, and treating the oxide film on the surface of the steel pipe by using the pickling solution; s14: soaking the steel pipe in a container containing chemical polishing solution for 5-20 min, soaking in clean water at normal temperature, and washing.

3. The surface processing technique of the alloy seamless steel tube according to the claim 2, characterized in that the chemical polishing solution in the S14 is prepared by phosphoric acid, hydrochloric acid, composite brightener and surfactant according to the proportion of 1-2: 2-4: 0.1-0.4: 0.2-0.3.

4. The surface processing process of an alloy seamless steel tube according to claim 2, wherein in step S13, before immersing the steel tube in a container containing pickling solution, an oxide film loosening process is further performed on the steel tube, in which mechanical stress is applied to the steel tube using a steel wire to crack the oxide film on the surface of the steel tube, the steel tube and water are placed in the container for ultrasonic oscillation, and the temperature is raised, added with a solvent, and lowered during the ultrasonic oscillation, so that the water temperature is maintained at 70-85 ℃ during the temperature raising process, the water temperature is maintained at 30-40 ℃ during the temperature lowering process, and the solvent is sodium phosphate and sulfate.

5. The surface processing treatment process of the alloy seamless steel pipe as claimed in claim 2, wherein the pickling solution comprises the following components in parts by weight: 30-45 parts of sulfuric acid, 40-63 parts of nitric acid, 20-35 parts of hydrofluoric acid, 5-10 parts of hydroxyethylidene diphosphonic acid, 30-56 parts of urea and 10-17 parts of sulfonated coal; the oil removing treatment liquid is a mixture containing sodium hydroxide, sodium silicate and a detergent.

6. The surface processing technology of an alloy seamless steel tube according to claim 1, wherein the step S2 specifically comprises: s21: putting the steel pipe into a phosphorization container for phosphorization, so that a phosphate film with compact and uniform crystals is generated in the phosphorization process of the steel pipe; s22: after the phosphorization is finished, coating the steel pipe with an antirust treatment liquid to form an antirust protective film with the thickness of 0.01-0.2mm on the steel pipe; s23: and drying the steel pipe coated with the antirust protective film to finish one-time anticorrosion and antirust treatment.

7. The surface processing treatment process of the alloy seamless steel tube according to claim 1, wherein the secondary anticorrosive and antirust treatment in S3 comprises spraying anticorrosive and antirust finish paint, and the anticorrosive and antirust finish paint comprises the following components in parts by weight: 10-17 parts of acrylic resin, 6-10 parts of modified resin, 3-9 parts of organic acid ammonia complex, 3-5 parts of kaolin, 2-4 parts of dimethylbenzene, 2-5 parts of graphite powder, 0.2-1 part of preservative and 1-3 parts of butyl acetate.

Technical Field

The invention relates to the field related to surface treatment of alloy steel pipes, in particular to a surface processing treatment process of an alloy seamless steel pipe.

Background

A seamless steel pipe is a steel pipe made of a single piece of metal and having no seam on the surface; according to the production method, the seamless pipe is divided into a hot rolled pipe, a cold drawn pipe, an extruded pipe, a pipe jacking and the like; the seamless steel pipe is divided into a round shape and a special shape according to the shape of a section, and the special-shaped pipe has various complex shapes such as a square shape, an oval shape, a triangular shape, a hexagonal shape, a melon seed shape, a star shape and a pipe with fins. The seamless steel pipe is mainly used as a petroleum geology drill pipe, a cracking pipe, a boiler pipe and a bearing pipe for petrochemical industry, and a high-precision structural steel pipe for automobiles, tractors and aviation, and has wide application range.

The seamless steel pipe is oxidized and corroded in the using process, so that huge loss is caused, and in order to avoid the oxidation and corrosion of the seamless steel pipe, the surface of the seamless steel pipe is treated before being put into use, so that the corrosion resistance of the seamless steel pipe is improved, and the service life of the seamless steel pipe is prolonged. The prior surface treatment for the seamless steel pipe is generally realized by means of spraying anticorrosive paint and the like, and the anti-oxidation and corrosion-resistant treatment for the seamless steel pipe cannot be realized essentially.

Disclosure of Invention

The invention aims to provide a surface processing treatment process of an alloy seamless steel pipe, which aims to solve the problems in the background technology.

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

a surface processing treatment process of an alloy seamless steel pipe comprises the following steps:

s1: cleaning the outer surface of the steel pipe, wherein the cleaning treatment of the outer surface comprises oil removal treatment, oxide treatment and polishing treatment;

s2: performing primary anticorrosion and antirust treatment on the cleaned steel pipe, wherein the primary anticorrosion and antirust treatment comprises phosphating treatment and antirust coating treatment;

s3: and (3) carrying out secondary anticorrosion and antirust treatment on the steel pipe subjected to the primary antirust treatment, drying the steel pipe after the secondary anticorrosion and antirust treatment, and finishing the surface treatment process after drying.

As a preferable technical solution of the present invention, the outer surface cleaning process in S1 includes the steps of: s11: preparing an oil removal treatment solution and a pickling solution; s12: immersing the steel pipe into a container containing an oil removal treatment solution, and cleaning oil stains on the surface of the steel pipe by using the oil removal treatment solution; s13: immersing the steel pipe in a container containing pickling solution, and treating the oxide film on the surface of the steel pipe by using the pickling solution; s14: soaking the steel pipe in a container containing chemical polishing solution for 5-20 min, soaking in clean water at normal temperature, and washing.

As a preferred technical scheme of the invention, the chemical polishing solution in S14 is prepared by phosphoric acid, hydrochloric acid, a composite brightener and a surfactant according to the proportion of 1-2: 2-4: 0.1-0.4: 0.2-0.3.

As a preferable embodiment of the present invention, in S13, before immersing the steel pipe in the container containing the pickling solution, an oxide film loosening process is further performed on the steel pipe, that is, mechanical stress is applied to the steel pipe using a steel wire to crack the oxide film on the surface of the steel pipe, the steel pipe and water are placed in the container to be subjected to ultrasonic oscillation, and temperature rise, solvent addition and temperature drop are performed during the ultrasonic oscillation, so that the water temperature is maintained at 70 to 85 ℃ during the temperature rise, the water temperature is maintained at 30 to 40 ℃ during the temperature drop, and the solvent is sodium phosphate and sulfate.

As a preferred technical scheme of the invention, the pickling solution comprises the following components in parts by weight: 30-45 parts of sulfuric acid, 40-63 parts of nitric acid, 20-35 parts of hydrofluoric acid, 5-10 parts of hydroxyethylidene diphosphonic acid, 30-56 parts of urea and 10-17 parts of sulfonated coal; the oil removing treatment liquid is a mixture containing sodium hydroxide, sodium silicate and a detergent.

As a preferred technical solution of the present invention, S2 specifically includes: s21: putting the steel pipe into a phosphorization container for phosphorization, so that a phosphate film with compact and uniform crystals is generated in the phosphorization process of the steel pipe; s22: after the phosphorization is finished, coating the steel pipe with an antirust treatment liquid to form an antirust protective film with the thickness of 0.01-0.2mm on the steel pipe; s23: and drying the steel pipe coated with the antirust protective film to finish one-time anticorrosion and antirust treatment.

As a preferable technical scheme, the secondary anticorrosive and antirust treatment in S3 comprises spraying anticorrosive and antirust finish paint, wherein the anticorrosive and antirust finish paint comprises the following components in parts by weight: 10-17 parts of acrylic resin, 6-10 parts of modified resin, 3-9 parts of organic acid ammonia complex, 3-5 parts of kaolin, 2-4 parts of dimethylbenzene, 2-5 parts of graphite powder, 0.2-1 part of preservative and 1-3 parts of butyl acetate.

As a preferred technical scheme of the invention, the sprayed anticorrosive and antirust finish paint is added with graphite powder and organic acid ammonia complex, and single-layer carbon atoms of the graphite powder are uniformly dispersed in the paint and can be filled into micropores formed by curing the paint, so that the infiltration effect of corrosive media is prevented.

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

the invention carries out the steps of cleaning treatment, primary anti-corrosion and anti-rust treatment, secondary anti-corrosion and anti-rust treatment and the like on the steel pipe, adopts a mode of compound application of a plurality of surface treatment means, and has the advantages of safety, environmental protection, good product appearance quality, high surface smoothness, good corrosion resistance and the like compared with the existing mechanical or chemical single treatment process.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.