CN113416821A - Annealing process for Q235-W steel grade of spiral welded pipe - Google Patents
Annealing process for Q235-W steel grade of spiral welded pipe Download PDFInfo
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- CN113416821A CN113416821A CN202110705945.3A CN202110705945A CN113416821A CN 113416821 A CN113416821 A CN 113416821A CN 202110705945 A CN202110705945 A CN 202110705945A CN 113416821 A CN113416821 A CN 113416821A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/663—Bell-type furnaces
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses a Q235-W steel grade annealing process for a spiral welded pipe, which comprises the steps of annealing by using a full-nitrogen mode bell-type furnace, setting the recrystallization heat preservation temperature to 680 ℃, controlling the tapping temperature to 280 ℃, fully oxidizing a steel plate, and forming compact oxide films Fe with the width of 400 mm on two sides of strip steel3O4A thin oxide film is formed in the middle part to prevent the strip steel from being oxidized subsequently; the temperature curve is normally set according to the process curve; changing the time set value of the atmosphere curve into 0; changing the set value of the end temperature of the atmosphere curve into the tapping temperature of 280 ℃; changing the atmosphere types of the atmosphere curve into 0; and changing the atmosphere flow of the atmosphere curve to 0h/m for carrying out the high-speed thin film cultivation.
Description
Technical Field
The invention relates to an annealing process for a Q235-W steel grade of a spiral welded pipe.
Background
Low carbon steel has excellent weldability, good toughness and suitable strength characteristics, and is widely used in welded pipes. The steel for the Q235B carbon component can meet the structural requirements of common components and is economical and practical. The heating pipeline for town heating is a spiral steel pipe made of Q235B steel. When steel is rolled into steel pipe, there are gaps and welding is required. Due to uneven and large thickness (the maximum thickness fluctuation reaches 70 mu m), in the welding process of the common hot rolled plate, cold joint or welding line cracking occurs, and the welding quality and the service life are seriously influenced.
Disclosure of Invention
The invention aims to provide an annealing process for a Q235-W steel grade of a spiral welded pipe, which can further reduce the defect of uneven thickness, and ensure that the surface of strip steel is smooth and flat and the dimensional precision is improved.
The technical scheme adopted by the invention is as follows: an annealing process for a Q235-W steel grade of a spiral welded pipe comprises the steps of annealing by using a full-nitrogen mode bell-type furnace, setting the recrystallization heat preservation temperature to 680 ℃, controlling the tapping temperature to 280 ℃, fully oxidizing a steel plate, and forming compact oxide films Fe with the width of 400 mm on two sides of strip steel3O4A thin oxide film is formed in the middle part to prevent the strip steel from being oxidized subsequently; the temperature curve is normally set according to the process curve; changing the time set value of the atmosphere curve into 0; changing the set value of the end temperature of the atmosphere curve into the tapping temperature of 280 ℃; changing the atmosphere types of the atmosphere curve into 0; and changing the atmosphere flow of the atmosphere curve to 0h/m for carrying out the high-speed thin film cultivation.
The cold-rolled steel plate is used for replacing the steel plate, the thickness fluctuation is reduced to be less than 20 mu m, and meanwhile, the steel plate has the advantages of smooth and flat surface, high dimensional precision, good mechanical property and the like. Meanwhile, the common cold-rolled sheet is annealed in a hydrogen mode, and the corrosion speed is high when the surface of the steel sheet is not coated with oil, so that the welding quality and the surface quality are also influenced. Annealing in a full nitrogen mode bell-type furnace, setting the recrystallization heat preservation temperature to 680 ℃, controlling the tapping temperature to 280 ℃, fully oxidizing the steel plate, and forming compact oxide films (Fe) with the width of 400 mm on two sides of the strip steel3O4) And a thin oxide film is formed in the middle part to prevent the strip steel from being oxidized subsequently. The invention accelerates the welding speed by 1.5 times through the actual operation and use on site, and improves the welding quality to the highest value of history.
The specific implementation mode is as follows:
an annealing process for a Q235-W steel grade of a spiral welded pipe comprises the steps of annealing by using a full-nitrogen mode bell-type furnace, setting the recrystallization heat preservation temperature to 680 ℃, controlling the tapping temperature to 280 ℃, fully oxidizing a steel plate, and forming compact oxide films Fe with the width of 400 mm on two sides of strip steel3O4A thin oxide film is formed in the middle part to prevent the strip steel from being oxidized subsequently; the temperature curve is normally set according to the process curve;changing the time set value of the atmosphere curve into 0; changing the set value of the end temperature of the atmosphere curve into the tapping temperature of 280 ℃; changing the atmosphere types of the atmosphere curve into 0; and changing the atmosphere flow of the atmosphere curve to 0h/m for carrying out the high-speed thin film cultivation.
Claims (1)
1. The annealing process of the Q235-W steel grade of the spiral welded pipe is characterized in that a full-nitrogen mode bell-type furnace is used for annealing, the recrystallization heat preservation temperature is set to 680 ℃, the tapping temperature is controlled to 280 ℃, the steel plate is fully oxidized, and dense oxidation films Fe with the width of 400 mm per month are formed on two sides of the strip steel3O4A thin oxide film is formed in the middle part to prevent the strip steel from being oxidized subsequently; the temperature curve is normally set according to the process curve; changing the time set value of the atmosphere curve into 0; changing the set value of the end temperature of the atmosphere curve into the tapping temperature of 280 ℃; changing the atmosphere types of the atmosphere curve into 0; and changing the atmosphere flow of the atmosphere curve to 0h/m for carrying out the high-speed thin film cultivation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110705945.3A CN113416821A (en) | 2021-06-24 | 2021-06-24 | Annealing process for Q235-W steel grade of spiral welded pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110705945.3A CN113416821A (en) | 2021-06-24 | 2021-06-24 | Annealing process for Q235-W steel grade of spiral welded pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113416821A true CN113416821A (en) | 2021-09-21 |
Family
ID=77716786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110705945.3A Pending CN113416821A (en) | 2021-06-24 | 2021-06-24 | Annealing process for Q235-W steel grade of spiral welded pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113416821A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1341757A (en) * | 2001-08-13 | 2002-03-27 | 宁波宝新不锈钢有限公司 | Hot-rolled stainless steel annealing process under protection of full hydrogen gas |
| CN101634005A (en) * | 2008-07-25 | 2010-01-27 | 武钢集团昆明钢铁股份有限公司 | Titanium plate coil annealing process |
| CN102586580A (en) * | 2012-03-12 | 2012-07-18 | 溧阳市宏大机械设备有限公司 | Bell-type furnace annealing process for BSYE-N steel belt |
| CN103305680A (en) * | 2013-06-08 | 2013-09-18 | 首钢总公司 | Method for producing cold-rolled sheet by means of cover annealing blowing |
| CN104263901A (en) * | 2014-09-19 | 2015-01-07 | 北京首钢冷轧薄板有限公司 | Cold-rolled strip steel continuous annealing production system and method for refrigerated welded pipes as well as strip steel and welded pipes |
| US20170283903A1 (en) * | 2014-10-15 | 2017-10-05 | Sms Group Gmbh | Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process |
-
2021
- 2021-06-24 CN CN202110705945.3A patent/CN113416821A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1341757A (en) * | 2001-08-13 | 2002-03-27 | 宁波宝新不锈钢有限公司 | Hot-rolled stainless steel annealing process under protection of full hydrogen gas |
| CN101634005A (en) * | 2008-07-25 | 2010-01-27 | 武钢集团昆明钢铁股份有限公司 | Titanium plate coil annealing process |
| CN102586580A (en) * | 2012-03-12 | 2012-07-18 | 溧阳市宏大机械设备有限公司 | Bell-type furnace annealing process for BSYE-N steel belt |
| CN103305680A (en) * | 2013-06-08 | 2013-09-18 | 首钢总公司 | Method for producing cold-rolled sheet by means of cover annealing blowing |
| CN104263901A (en) * | 2014-09-19 | 2015-01-07 | 北京首钢冷轧薄板有限公司 | Cold-rolled strip steel continuous annealing production system and method for refrigerated welded pipes as well as strip steel and welded pipes |
| US20170283903A1 (en) * | 2014-10-15 | 2017-10-05 | Sms Group Gmbh | Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process |
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| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210921 |
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| WD01 | Invention patent application deemed withdrawn after publication |