阅读说明：本技术 一种热镀锌钢管及其制造方法 (Hot-dip galvanized steel pipe and manufacturing method thereof ) 是由 徐志茹 朱利新 沈阳 汪卫东 张琪 周锦进 柳东东 于 2019-11-13 设计创作，主要内容包括：一种热镀锌钢管及其制造方法,所述钢管的成分以质量百分比计：C：0.08-0.12％；Si：0.01-0.02％；Mn：0.5-1.0％：P＜0.020％；S＜0.020％；Ni：0.02-0.03％,余量为Fe以及不可避免的杂质。钢管的镀锌制造方法,包括预处理步骤、酸洗步骤、水洗步骤、浸助镀剂步骤、烘干预热步骤、热镀锌步骤以及钝化冷却步骤；所述热镀锌步骤中,采用的锌液温度为450-465℃,浸镀时间为3-5min；所述锌液中含有以质量百分比计0.05-0.12％的铝。本发明适用于单面300克每平方米钢管,其能够在合理的时间内取得比较好的镀锌效果。(A hot dip galvanized steel pipe and a manufacturing method thereof are disclosed, wherein the steel pipe comprises the following components in percentage by mass: c: 0.08-0.12%; si: 0.01 to 0.02 percent; mn: 0.5-1.0%: p is less than 0.020%; s is less than 0.020%; ni: 0.02-0.03%, and the balance of Fe and inevitable impurities. The steel pipe galvanizing manufacturing method comprises a pretreatment step, an acid washing step, a water washing step, a plating assistant agent dipping step, a drying and preheating step, a hot galvanizing step and a passivation cooling step; in the hot galvanizing step, the temperature of the adopted zinc liquid is 450-465 ℃, and the dip plating time is 3-5 min; the zinc liquid contains 0.05-0.12% of aluminum by mass percentage. The invention is suitable for a single-side 300 g steel pipe per square meter, and can obtain better galvanizing effect in reasonable time.)

1. A hot dip galvanized steel pipe comprises the following components in percentage by mass: c: 0.08-0.12%; si: 0.01 to 0.02 percent; mn: 0.5-1.0%: p is less than 0.020%; s is less than 0.020%; ni: 0.02-0.03%, and the balance of Fe and inevitable impurities.

2. A hot-dip galvanized steel pipe according to claim 1, characterized in that: c in the steel pipe is as follows by mass percent: 0.09-0.11 percent.

3. A hot-dip galvanized steel pipe according to claim 1, characterized in that: and the mass percentage of Si in the steel pipe is: 0.005-0.008%.

4. A hot-dip galvanized steel pipe according to claim 1, characterized in that: the mass percentage of Ni: 0.01-0.015%.

5. A method for manufacturing a hot-dip galvanized steel pipe comprises a pretreatment step, an acid washing step, a water washing step, a plating assistant agent dipping step, a drying and preheating step, a hot-dip galvanizing step and a passivation cooling step; the method is characterized in that:

in the hot galvanizing step, the temperature of the adopted zinc liquid is 450-465 ℃, and the dip plating time is 3-5 min; the zinc liquid contains 0.05-0.12% of aluminum by mass percentage.

6. A method for manufacturing a hot-dip galvanized steel pipe according to claim 5, characterized in that:

in the hot galvanizing step, the temperature of the adopted zinc liquid is 450-455 ℃, and the dip plating time is 3-4 min; the zinc liquid contains 0.1 mass percent of aluminum.

7. A method for manufacturing a hot-dip galvanized steel pipe according to claim 5 or 6, characterized in that:

in the hot galvanizing step, the temperature of the adopted zinc liquid is 450-455 ℃, and the dip plating time is 3 min; the zinc liquid contains 0.01% of Si by mass percent.

Technical Field

The invention relates to the technical field of steel pipes, in particular to a hot-dip galvanized steel pipe and a manufacturing method thereof, wherein the galvanizing quantity of the hot-dip galvanized steel pipe is 300 grams per square meter on one side.

Background

After the steel pipe is manufactured, it is necessary to galvanize the inner and outer surfaces of the steel pipe, and how to obtain a relatively good galvanization effect is a problem which is always searched for by a person skilled in the art, and a chinese patent application No. CN201910198792.0 discloses a hot-dip galvanizing process for the steel pipe, and for example, a chinese patent application No. CN201310171033.8 discloses a composition of a hot-dip galvanized steel sheet, and the chemical composition of the hot-dip galvanized high-strength steel sheet is as follows, C: 0.02 to 0.20%, Si: less than or equal to 0.03 percent, Mn: 0.10-0.60%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, and the balance is Fe and inevitable impurity elements, and the steel can be used for manufacturing galvanized steel pipes. However, the disclosed components and methods of the galvanized steel pipe and the galvanized steel sheet are widely applicable, and the specific galvanizing process has different galvanizing contents and greatly different components and manufacturing methods, and the invention aims to solve the problem of how to obtain an ideal galvanizing effect in an ideal time when the galvanizing content is 300 grams per square meter of the steel pipe on one side.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a hot-dip galvanized steel pipe and a manufacturing method thereof, which are only used for galvanizing the steel pipe with a single surface of 300 grams per square meter, solve the problems in the prior art, and have good galvanizing effect and bright surface.

The technical purpose of the invention is realized by the following technical scheme: a hot dip galvanized steel pipe comprises the following components in percentage by mass: c: 0.08-0.12%; si: 0.01 to 0.02 percent; mn: 0.5-1.0%: p is less than 0.020%; s is less than 0.020%; ni: 0.02-0.03%, and the balance of Fe and inevitable impurities.

As a further preferred embodiment of the present invention; c in the steel pipe is as follows by mass percent: 0.09-0.11 percent.

As a further preferred embodiment of the present invention; and the mass percentage of Si in the steel pipe is: 0.005-0.008%.

As a further preferred embodiment of the present invention; the mass percentage of Ni: 0.01-0.015%.

A method for manufacturing a hot-dip galvanized steel pipe comprises a pretreatment step, an acid washing step, a water washing step, a plating assistant agent dipping step, a drying and preheating step, a hot-dip galvanizing step and a passivation cooling step; the method is characterized in that:

in the hot galvanizing step, the temperature of the adopted zinc liquid is 450-465 ℃, and the dip plating time is 3-5 min; the zinc liquid contains 0.05-0.12% of aluminum by mass percentage.

As a further preferred embodiment of the present invention; in the hot galvanizing step, the temperature of the adopted zinc liquid is 450-455 ℃, and the dip plating time is 3-4 min; the zinc liquid contains 0.1 mass percent of aluminum.

As a further preferred embodiment of the present invention; in the hot galvanizing step, the temperature of the adopted zinc liquid is 450-455 ℃, and the dip plating time is 3 min; the zinc liquid contains 0.01% of Si by mass percent.

In conclusion, the invention has the following beneficial effects:

the invention is suitable for a single-side 300 g steel pipe per square meter, and can obtain better galvanizing effect in reasonable time.

Detailed Description