CN112958930A - Welding method for high-carbon equivalent strip steel in continuous annealing - Google Patents
Welding method for high-carbon equivalent strip steel in continuous annealing Download PDFInfo
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- CN112958930A CN112958930A CN202110173934.5A CN202110173934A CN112958930A CN 112958930 A CN112958930 A CN 112958930A CN 202110173934 A CN202110173934 A CN 202110173934A CN 112958930 A CN112958930 A CN 112958930A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 84
- 239000010959 steel Substances 0.000 title claims abstract description 84
- 238000003466 welding Methods 0.000 title claims abstract description 61
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000000137 annealing Methods 0.000 title claims abstract description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 229910000760 Hardened steel Inorganic materials 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000005336 cracking Methods 0.000 abstract description 3
- 210000005067 joint tissue Anatomy 0.000 abstract description 2
- 239000011651 chromium Substances 0.000 description 6
- 229910000734 martensite Inorganic materials 0.000 description 5
- 229910001563 bainite Inorganic materials 0.000 description 4
- 239000002436 steel type Substances 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 229910001568 polygonal ferrite Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D9/56—Continuous furnaces for strip or wire
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention relates to a welding method of high-carbon equivalent strip steel in continuous annealing, which comprises the steps of continuously annealing the strip steel, welding a plurality of steel coils together end to end, and then continuously annealing, wherein the carbon equivalent of two adjacent steel coils to be welded are different and are respectively high-carbon equivalent strip steel and low-carbon equivalent strip steel. The method can effectively solve the problem that the high-carbon equivalent strip steel is difficult to weld during continuous annealing, avoids the risk of strip breakage caused by cracking in a weld joint tissue, and improves the stability of welding quality; the smooth production of the strip steel is ensured, the strip speed of the continuous annealing of the target steel grade and the stability of the furnace area process are improved, the coil-through stability of the product is optimized, and the productivity and the economic benefit of enterprises are improved.
Description
Technical Field
The invention belongs to the technical field of continuous annealing production of strip steel, and particularly relates to a welding method of high-carbon-equivalent strip steel in continuous annealing.
Background
In the continuous annealing process of the high-strength steel strip, welding is the first step of the continuous annealing production flow, and the strip steel is continuous through the head and the tail of the strip steel. Then the strip steel enters a furnace area to be produced according to a specific process, so that the continuous and stable welding quality is a precondition for ensuring smooth continuous annealing production. The quality of welding quality affects the strip speed stability of continuous annealing and the process of a furnace area, and further affects the coil-through stability of products.
The high carbon equivalent steel variety in the continuously annealed products is mainly concentrated on high-strength steel products, and the series of products are mainly rich in elements such as carbon, chromium, molybdenum and the like, so that the strength or hardenability is improved to ensure the strength of the steel. The high-strength steel product is rich in the elements, so that the carbon equivalent Ceq of the high-strength steel product is greatly improved. With the increase of the carbon equivalent of the strip steel, the welding difficulty is further increased. After welding, the strip steel enters a loop and a furnace area, and is subjected to the tension action of the loop in the process, so that the welding quality is poor, and the welding seam is subjected to tensile stress, so that the risk of cracking and breaking of the welding seam is very easy to occur. Therefore, a method for improving the stability of welding quality is urgently needed, and the occurrence of strip breakage of the strip steel is avoided or reduced.
Most of the existing strip steel welding adopts the method of welding the same steel type and optimizing the welding process so as to improve the welding quality of the strip steel, reduce the strip breakage accidents of the strip steel and ensure the stable operation of production. For example, patent application publication No. CN108296638A discloses "a method for improving welding quality of strip steel in a continuous galvanizing line", which improves or enhances the stability of super-cooled austenite and optimizes the stability of welding quality by controlling post-welding air cooling time, post-welding heating temperature and post-welding heating time. However, in the welding process of the high-carbon equivalent strip steel, the method adopted for welding the high-carbon equivalent strip steel with the steel type per se cannot obtain good welding quality. Because of the enrichment of carbon, chromium, molybdenum and other elements, the stability of the super-cooled austenite cannot be optimized by the method in the patent, and the welding structure contains more brittle phases such as martensite and bainite. The strip steel enters a loop and a furnace area in the follow-up process, the tension of the loop acts on the strip steel in the process, the welding seam is subjected to tensile stress, micro cracks are easy to appear in the presence of brittle and hard phases along with the existence of the stress, and the risk of strip breakage is further improved along with the further expansion of the micro cracks. Therefore, a welding method aiming at the high-carbon equivalent strip steel is urgently needed to realize the production stability of the strip steel.
Disclosure of Invention
The invention aims to solve the technical problem of providing a welding method of high-carbon equivalent strip steel in continuous annealing, improving the stability of welding quality and avoiding or reducing the strip breakage of the strip steel in the continuous annealing process.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for welding high-carbon-equivalent strip steel in continuous annealing is characterized in that a plurality of steel coils are welded together end to end in the continuous annealing process of the strip steel, and then continuous annealing is carried out.
Furthermore, two adjacent steel coils to be welded are respectively high-carbon equivalent strip steel and low-carbon equivalent strip steel.
Furthermore, the carbon equivalent of the high-carbon equivalent strip steel is more than 0.1 percent, the carbon equivalent of the low-carbon equivalent strip steel is less than or equal to 0.1 percent, and the carbon equivalent calculation formula is Ceq = [ C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15 ]. 100 percent, wherein C, Mn, Cr, Mo, V, Ni and Cu are the weight percentage content of corresponding elements in the steel.
Further, the strip steel for welding is cold-hard strip steel after acid rolling.
Furthermore, the welding mode is narrow lap welding.
Furthermore, the thickness of the strip steel is 0.7mm-2.0 mm.
The welding method adopts different steel types for welding, particularly adopts high-carbon equivalent different steel types for alternate welding, and in the welding process, the high-carbon equivalent steel and the low-carbon equivalent steel are welded, the weld joint structure at one side of the low-carbon equivalent steel is in the shape of polygonal ferrite, and one side of the high-carbon equivalent steel is mainly provided with ferrite and martensite and is accompanied with a small amount of bainite. The structure composition of the welding seam structure between soft and hard is adopted, so that the concentration of stress is avoided, meanwhile, in the cooling process after welding, the influence of heat conduction on one side of the welding structure of the high-carbon equivalent strip steel is avoided, the stability of super-cooled austenite is improved to some extent, more brittle and hard martensite phases are avoided being generated, the welding seam structure is softened, and the condition that the welding seam is easy to generate micro cracks under the action of the tension of the loop in the subsequent process of entering the loop and the furnace area is weakened.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the method can effectively solve the problem that the high-carbon equivalent strip steel is difficult to weld during continuous annealing, avoids the risk of strip breakage caused by cracking in a weld joint tissue, and improves the stability of welding quality; the smooth production of the strip steel is ensured, the strip speed of the continuous annealing of the target steel grade and the stability of the furnace area process are improved, the coil-through stability of the product is optimized, and the productivity and the economic benefit of enterprises are improved.
Drawings
FIG. 1 is a metallographic structure diagram (200 times) of a heat affected zone on the low carbon equivalent side of a weld part in example 1;
FIG. 2 metallographic structure of the weld at the weld site of example 1 (200 times);
FIG. 3 is a metallographic structure diagram (200 times) of a heat affected zone on the side with high carbon equivalent of a weld part in example 1;
figure 4 example 1 weld cupping test results.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to better illustrate the invention, the following examples are given by way of further illustration.
Examples 1 to 10
Welding a cold-hard strip steel coil at the inlet of a continuous annealing furnace, wherein the thickness of the strip steel is shown in table 2, the welding mode adopts narrow lap welding, a high-carbon equivalent steel coil A and a low-carbon equivalent steel coil B are welded in the welding process, the low-carbon equivalent steel coil B is welded with another high-carbon equivalent steel coil A, namely the high-carbon equivalent steel coil and the low-carbon equivalent steel coil are alternately welded according to the mode of A-B-A-B … …, the weight percentage contents of C, Mn, Cr, Mo, V, Ni and Cu of the high-carbon equivalent steel coil and the low-carbon equivalent steel coil are shown in table 1, the carbon equivalent is shown in table 2, and the calculation formula of the carbon equivalent is Ceq = [ C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu.
TABLE 1
TABLE 2
The microstructure of the welding seam part of the strip steel in the embodiment 1-10 is inspected, and the result of the inspection is that the metallographic structure of the heat affected zone on the low-carbon equivalent side of the welding part is mainly polygonal ferrite; the metallographic structure of the welding seam has an obvious interface, one side is ferrite, and the other side is ferrite, martensite and a small amount of bainite; the metallographic structure of the heat affected zone on one side with high carbon equivalent is mainly ferrite and martensite, and is accompanied by a small amount of bainite;
the weld performance of the strip steels of examples 1-10 was tested by a weld cup bulging test, and the test results were all perpendicular to the weld crack.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (6)
1. A method for welding high-carbon-equivalent strip steel in continuous annealing is characterized in that a plurality of steel coils are welded together end to end in the continuous annealing process of the strip steel, and then continuous annealing is carried out.
2. The welding method of the high carbon equivalent steel strip in the continuous annealing as claimed in claim 1, wherein the two adjacent steel coils to be welded are the high carbon equivalent steel strip and the low carbon equivalent steel strip respectively.
3. The welding method of claim 2, wherein the carbon equivalent of the high carbon equivalent strip steel is greater than 0.1%, the carbon equivalent of the low carbon equivalent strip steel is less than or equal to 0.1%, and the Ceq is calculated according to the formula Ceq = [ C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15 ]. 100%, wherein C, Mn, Cr, Mo, V, Ni, Cu are the weight percentages of the corresponding elements in the steel.
4. A welding method of a high carbon equivalent steel strip in a continuous annealing according to any one of claims 1 to 3, characterized in that the steel strip to be welded is a cold-hardened steel strip after acid rolling.
5. A welding method of high carbon equivalent steel strip in continuous annealing according to any one of claims 1 to 3, characterized in that the welding is narrow lap welding.
6. A welding method for a high carbon equivalent steel strip in a continuous annealing according to any one of claims 1 to 3, wherein said steel strip has a thickness of 0.7mm to 2.0 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110173934.5A CN112958930A (en) | 2021-02-06 | 2021-02-06 | Welding method for high-carbon equivalent strip steel in continuous annealing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110173934.5A CN112958930A (en) | 2021-02-06 | 2021-02-06 | Welding method for high-carbon equivalent strip steel in continuous annealing |
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| CN112958930A true CN112958930A (en) | 2021-06-15 |
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| CN202110173934.5A Pending CN112958930A (en) | 2021-02-06 | 2021-02-06 | Welding method for high-carbon equivalent strip steel in continuous annealing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113857241A (en) * | 2021-09-25 | 2021-12-31 | 新疆八一钢铁股份有限公司 | Cross welding and rolling production method for cold-rolled 25# steel and SPCC steel |
| CN115365296A (en) * | 2022-07-18 | 2022-11-22 | 新疆八一钢铁股份有限公司 | Cross welding and rolling production method for cold-rolled 25# steel and SPCC steel |
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Application publication date: 20210615 |