CN113083914A - Cooling method for controlling side bending deformation of marine L-shaped steel after rolling - Google Patents
Cooling method for controlling side bending deformation of marine L-shaped steel after rolling Download PDFInfo
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Abstract
The invention relates to a cooling method for controlling side bending deformation of a marine L-shaped steel after rolling, which belongs to the field of marine structural steel manufacturing, and the cooling method is characterized in that according to the section characteristics and the heat dissipation rule of the L-shaped steel, water cooling with different strengths is applied to each part of the L-shaped steel at the same time, so that the cooling strength of an R angle position is greater than that of two sides of a panel and that of two sides of a web, and the cooling strength of the two sides of the panel is greater than that of two sides of the web, thereby improving the uniformity of the cooling temperature of the L-shaped steel in the cooling process, eliminating or lightening the serious side bending of the L-shaped steel caused by uneven cooling, achieving the effects of improving the quality and the yield of steel, and improving; the bending amount is reduced from 0.1m or more to 0.01 to 0.05 m.
Description
Technical Field
The invention belongs to the field of manufacturing of marine structural steel, and particularly relates to a cooling method for controlling lateral bending deformation of marine L-shaped steel after rolling.
Background
The hot-rolled L-shaped steel is mainly used in the shipbuilding industry and is important steel for ship body structures. With the rapid development of the shipbuilding industry at home and abroad, the demand of the L-shaped steel is gradually increased, and the market prospect is increasingly wide. Compared with the production of domestic marine L-shaped steel, the production efficiency and the yield are low, and the yield is maintained at about 83% for a long time. L shaped steel belongs to the asymmetric section bar of flat class, and the heat-retaining of each position is different, and the cooling method of present domestic L shaped steel mainly is natural air cooling, and this has just caused L shaped steel refrigerated inhomogeneous, makes L shaped steel heat dissipation slow position and the great difference in temperature of heat dissipation fast position production. Uneven cooling can cause the L-shaped steel to generate larger internal stress and generate serious lateral bending deformation after the L-shaped steel is cooled on a cooling bed. When the lateral bending deformation is serious, the rolled piece can not pass through the straightening machine, or can pass through the straightening machine but can not be effectively straightened. It can be said that the unevenness of cooling of the L-section steel is an important factor affecting the yield of the L-section steel.
Stress generated by uneven section cooling of the asymmetrical section steel can cause the rolled piece to finally bend to the thick-wall side with slow cooling. The existing method for controlling the cold rear side bending deformation of the section steel mainly comprises cold bed pre-bending treatment and controlled cooling. The pre-bending treatment of the cooling bed is that the pre-bending function is added on the feeding device of the cooling bed according to the cooling rule of the section steel to pre-bend the rolled piece. When the pre-bending stroke is large, the edge of the web plate of the L-shaped steel is easy to generate wave bending and instability phenomena, so that the subsequent straightening and the yield are adversely affected. The problem that the flat profile steel with the seriously asymmetric section such as the L-shaped steel is bent too much in the lateral direction is difficult to fundamentally solve by singly relying on the pre-bending of the cooling bed. Regarding to the aspect of cooling control, the cooling mode of domestic L shaped steel is mainly natural air cooling at present, and enterprises also propose to adopt the mode of segmentation gas mist cooling to carry out forced cooling to the inside surface at L shaped steel wall thickness position, but gas mist cooling's cooling strength is lower, and to L shaped steel need the pertinence at cooling position not enough, to L shaped steel's section difference in temperature regulation and control ability relatively poor.
Disclosure of Invention
Aiming at the technical problems, the invention provides a cooling method for controlling the lateral bending deformation of a marine L-shaped steel after rolling, which is used for applying forced water cooling with different strengths and adjustable strengths to different parts of the L-shaped steel and improving the cooling uniformity of the L-shaped steel so as to solve the problem of serious lateral bending deformation of the L-shaped steel after the L-shaped steel is cooled to normal temperature on a cooling bed. The specific technical scheme is as follows:
a cooling method for controlling side bending deformation of a marine L-shaped steel after rolling comprises the following steps:
step 1: after finishing finish rolling of the unburnt marine L-shaped steel billet, obtaining final-rolled marine L-shaped steel, then carrying out rapid cooling treatment, and applying cooling with different strengths to three parts of the final-rolled marine L-shaped steel, wherein the cooling strength is as follows: the cooling strength of the R angular position > the cooling strength of the two side positions of the panel > the cooling strength of the two side positions of the web plate, the overall cooling speed of the marine L-shaped steel is 30-150 ℃/s, the cooling time is 3-15 s, and the final cooling temperature is 450-710 ℃ to obtain the marine L-shaped steel after final cooling;
step 2: and (3) returning the temperature of the finally cooled marine L-shaped steel to 530-820 ℃, then allowing the L-shaped steel to enter a cooling bed for air cooling and cooling to room temperature, wherein the bending amount of the marine L-shaped steel after air cooling by the cooling bed is 0.01-0.05 m.
The chemical components of the marine L-shaped steel are as follows by weight percent: 0.11 to 0.18%, Si: 0.27 to 0.5%, Mn: 0.5-1.5%, P: less than or equal to 0.03%, S: less than or equal to 0.03%, Cu: less than or equal to 0.35 percent, Cr: less than or equal to 0.25 percent, Ni: 0.24-0.4%, Nd: less than or equal to 0.05 percent, V: less than or equal to 0.09%, Ti: less than or equal to 0.02 percent, Mo: less than or equal to 0.08 percent, and the balance of Fe and inevitable impurities;
the marine L-shaped steel relates to general strength and high strength, and the grades of the steel specifically comprise A grade, B grade, D grade, AH 32-AH 40 grade and DH 32-DH 40 grade;
the temperature of the finally rolled marine L-shaped steel is 880-930 ℃;
the length of the marine L-shaped steel is 20-25 m;
the cooling is water cooling;
the cooling intensity is represented by a cooling speed, the cooling intensity of the R angular position is 30-150 ℃/s, the cooling intensity of the positions on two sides of the panel is 30-130 ℃/s, and the cooling intensity of the positions on two sides of the web is 30-110 ℃/s.
Compared with the prior art, the cooling method for controlling the lateral bending deformation of the marine L-shaped steel after rolling has the beneficial effects that:
on the premise of not influencing the continuous rolling operation rate and the rolling mill output, the forced water cooling step is added, the temperature of the section of the L-shaped steel after being returned to the temperature and the uniformity of subsequent air cooling are improved, the temperature difference of the section of the L-shaped steel in the cooling process is reduced, and the overall cooling speed is also improved, so that the production efficiency is improved.
According to the cross section characteristics and the heat dissipation rule of the L-shaped steel, water cooling with different strengths is applied to all parts of the L-shaped steel simultaneously, the cooling strength of the R-angle position is greater than the positions of two sides of the panel and the positions of two sides of the web, and the cooling strength of the positions of two sides of the panel is greater than the positions of two sides of the web, so that the uniformity of the cooling temperature after the L-shaped steel is cooled on a cooling bed is improved, the serious lateral bending caused by uneven cooling of the L-shaped steel is eliminated or reduced, the effect of improving the quality and yield of steel is achieved, and the yield can be improved to more than 95% from 83; the bending amount is reduced from 0.1m or more to 0.01 to 0.05 m.
And thirdly, the cooling method is simple to operate and has good realizability.
Drawings
FIG. 1 is a schematic cooling diagram of marine L-shaped steel after finish rolling in example 1 of the present invention, wherein: 1-I water tank, 2-II water tank, 3-III water tank, 4-IV water tank, 5-V water tank, and 6-final-rolled marine L-shaped steel.
Detailed Description
The invention will be further described with reference to the following description and the accompanying drawing 1, but the invention is not limited to these examples.
Example 1
A cooling method for controlling side bending deformation of a marine L-shaped steel after rolling comprises the following steps:
step 1: after the cogging marine L-shaped steel billet is finished and finish rolled, obtaining final-rolled marine L-shaped steel 6, then carrying out rapid cooling treatment, and applying different-strength cooling to three parts of the final-rolled marine L-shaped steel 6, as shown in figure 1, adopting nozzles of a No. I water tank 1 and a No. II water tank 2 to carry out water cooling on two side positions of a panel, adopting nozzles of a No. III water tank 3 and a No. IV water tank 4 to carry out water cooling on two side positions of a web plate, adopting a nozzle of a No. V water tank 5 to carry out water cooling on an R angle position, wherein the cooling strength is as follows: the cooling strength of the R angular position > the cooling strength of the positions on the two sides of the panel > the cooling strength of the positions on the two sides of the web plate, the integral cooling speed of the marine L-shaped steel is 62 ℃/s, the cooling time is 5s, and the final cooling temperature is 600 ℃, so that the marine L-shaped steel after final cooling is obtained;
step 2: and (3) returning the temperature of the finally cooled marine L-shaped steel to 679-685 ℃, and then allowing the L-shaped steel to enter a cooling bed for air cooling and cooling to room temperature.
The chemical components of the marine L-shaped steel are as follows by weight percent: 0.11 to 0.17%, Si: 0.42 to 0.5%, Mn: 0.5-1%, P: less than or equal to 0.035%, S: less than or equal to 0.03%, Cu: less than or equal to 0.35 percent, Cr: less than or equal to 0.25 percent, Ni: 0.24-0.3%, and the balance of Fe and inevitable impurities;
the marine L-shaped steel has the strength grade of A grade;
the temperature of the finally rolled L-shaped steel for the ship is 910 ℃;
the specification of the marine L-shaped steel is L250 multiplied by 90 multiplied by 12 multiplied by 16;
the cooling is water cooling;
the cooling intensity is represented by a cooling speed, the cooling intensity of the R angular position is 60-70 ℃/s, the cooling intensity of the positions on two sides of the panel is 57-66 ℃/s, and the cooling intensity of the positions on two sides of the web is 52-63 ℃/s.
The marine L-section steel cooled in this example was slightly bent by the naked eye to an extent of 0.01 m. Under the same other conditions, the marine L-section steel cooled in this example was directly cooled in the cooling bed, and after cooling to room temperature, the marine L-section steel was largely bent toward the panel side, and the bending amount was H0.13 m. It is demonstrated that the cooling effect of the present embodiment is better.
Example 2
A cooling method for controlling side bending deformation of a marine L-shaped steel after rolling comprises the following steps:
step 1: after the finish rolling of the unburnt marine L-shaped steel billet is completed, the final rolled marine L-shaped steel is obtained, then the rapid cooling treatment is carried out, and the cooling with different strengths is applied to three parts of the final rolled marine L-shaped steel, the cooling mode is the same as that of the example 1, and the cooling strength is as follows: the cooling strength of the R angular position > the cooling strength of the positions on the two sides of the panel > the cooling strength of the positions on the two sides of the web plate, the integral cooling speed of the marine L-shaped steel is 50 ℃/s, the cooling time is 6s, and the final cooling temperature is 620 ℃, so that the marine L-shaped steel after final cooling is obtained;
step 2: and (3) returning the temperature of the finally cooled marine L-shaped steel to 711-719 ℃, and then allowing the L-shaped steel to enter a cooling bed for air cooling and cooling to room temperature.
The chemical components of the marine L-shaped steel are as follows by weight percent: 0.11 to 0.18%, Si: 0.27 to 0.35%, Mn: 0.8-1%, P: less than or equal to 0.03%, S: less than or equal to 0.03%, Cu: less than or equal to 0.35 percent, Cr: less than or equal to 0.25 percent, Ni: 0.24-0.3%, and the balance of Fe and inevitable impurities;
the marine L-shaped steel has the strength grade of B grade;
the temperature of the finally rolled L-shaped steel for the ship is 920 ℃;
the specification of the marine L-shaped steel is L300 multiplied by 90 multiplied by 11 multiplied by 16;
the cooling is water cooling;
the cooling intensity is represented by a cooling speed, the cooling intensity at the R angular position is 49-60 ℃/s, the cooling intensity at the positions on two sides of the panel is 44-55 ℃/s, and the cooling intensity at the positions on two sides of the web is 43-51 ℃/s.
The marine L-shaped steel cooled in this example was only slightly bent, and the bending amount H was 0.03 m. Under the same other conditions, the marine L-section steel cooled in this example was directly cooled in the cooling bed, and after cooling to room temperature, the marine L-section steel was largely bent toward the panel side, and the bending amount was H0.17 m. It is demonstrated that the cooling effect of the present embodiment is better.
Example 3
A cooling method for controlling side bending deformation of a marine L-shaped steel after rolling comprises the following steps:
step 1: after the finish rolling of the unburnt marine L-shaped steel billet is completed, the final rolled marine L-shaped steel is obtained, then the rapid cooling treatment is carried out, and the cooling with different strengths is applied to three parts of the final rolled marine L-shaped steel, the cooling mode is the same as that of the example 1, and the cooling strength is as follows: the cooling strength of the R angular position > the cooling strength of the positions on the two sides of the panel > the cooling strength of the positions on the two sides of the web plate, the integral cooling speed of the marine L-shaped steel is 70 ℃/s, the cooling time is 3s, and the final cooling temperature is 670 ℃, so that the marine L-shaped steel after final cooling is obtained;
step 2: and (3) returning the temperature of the finally cooled marine L-shaped steel to 754-765 ℃, and then, allowing the L-shaped steel to enter a cooling bed for air cooling and cooling to room temperature.
The chemical components of the marine L-shaped steel are as follows by weight percent: 0.11 to 0.17%, Si: 0.29 to 0.34%, Mn: 0.6-1%, P: less than or equal to 0.03%, S: less than or equal to 0.03%, Cu: less than or equal to 0.35 percent, Cr: less than or equal to 0.25 percent, Ni: 0.24-0.3%, and the balance of Fe and inevitable impurities;
the strength grade of the marine L-shaped steel is D grade.
The temperature of the finally rolled L-shaped steel for the ship is 880 ℃;
the specification of the marine L-shaped steel is L350 multiplied by 100 multiplied by 12 multiplied by 17;
the cooling is water cooling;
the cooling intensity is represented by a cooling speed, the cooling intensity of the R angular position is 71-79 ℃/s, the cooling intensity of the positions on two sides of the panel is 65-75 ℃/s, and the cooling intensity of the positions on two sides of the web is 61-70 ℃/s.
The marine L-shaped steel cooled in this example was only slightly bent, and the bending amount H was 0.04 m. Under the same other conditions, the marine L-section steel cooled in this example was directly cooled in the cooling bed, and after cooling to room temperature, the marine L-section steel was largely bent toward the panel side, and the bending amount was H0.2 m. It is demonstrated that the cooling effect of the present embodiment is better.
Example 4
A cooling method for controlling side bending deformation of a marine L-shaped steel after rolling comprises the following steps:
step 1: after the finish rolling of the unburnt marine L-shaped steel billet is completed, the final rolled marine L-shaped steel is obtained, then the rapid cooling treatment is carried out, and the cooling with different strengths is applied to three parts of the final rolled marine L-shaped steel, the cooling mode is the same as that of the example 1, and the cooling strength is as follows: the cooling strength of the R angular position > the cooling strength of the positions on the two sides of the panel > the cooling strength of the positions on the two sides of the web plate, the integral cooling speed of the marine L-shaped steel is 89 ℃/s, the cooling time is 4s, and the final cooling temperature is 544 ℃, so that the marine L-shaped steel after final cooling is obtained;
step 2: and (3) returning the temperature of the finally cooled marine L-shaped steel to 625-637 ℃, and then, allowing the L-shaped steel to enter a cooling bed for air cooling and cooling to room temperature.
The chemical components of the marine L-shaped steel are as follows by weight percent: 0.11 to 0.18%, Si: 0.42 to 0.5%, Mn: 0.9-1.5%, P: less than or equal to 0.03%, S: less than or equal to 0.03%, Cu: less than or equal to 0.35 percent, Cr: less than or equal to 0.19 percent, Ni: 0.24-0.4%, Nd: 0.02-0.05%, V: 0.05-0.09%, Ti: less than or equal to 0.02 percent, Mo: less than or equal to 0.08 percent, and the balance of Fe and inevitable impurities;
the strength grade of the marine L-shaped steel is AH 36;
the temperature of the finally rolled marine L-shaped steel is 900 ℃;
the specification of the marine L-shaped steel is L400 multiplied by 100 multiplied by 11.5 multiplied by 16; .
The cooling is water cooling;
the cooling intensity is represented by a cooling speed, the cooling intensity of the R angular position is 88-97 ℃/s, the cooling intensity of the positions on two sides of the panel is 83-93 ℃/s, and the cooling intensity of the positions on two sides of the web is 79-91 ℃/s.
The marine L-shaped steel cooled in this example was only slightly bent, and the bending amount H was 0.05 m. Under the same other conditions, the marine L-section steel cooled in this example was directly cooled in the cooling bed, and after cooling to room temperature, the marine L-section steel was largely bent toward the panel side, and the bending amount was H0.14 m. It is demonstrated that the cooling effect of the present embodiment is better.
Example 5
A cooling method for controlling side bending deformation of a marine L-shaped steel after rolling comprises the following steps:
step 1: after the finish rolling of the unburnt marine L-shaped steel billet is completed, the final rolled marine L-shaped steel is obtained, then the rapid cooling treatment is carried out, and the cooling with different strengths is applied to three parts of the final rolled marine L-shaped steel, the cooling mode is the same as that of the example 1, and the cooling strength is as follows: the cooling strength of the R angular position > the cooling strength of the positions on the two sides of the panel > the cooling strength of the positions on the two sides of the web plate, the overall cooling speed of the marine L-shaped steel is 40.4 ℃/s, the cooling time is 10s, and the final cooling temperature is 512 ℃, so that the marine L-shaped steel after final cooling is obtained;
step 2: and (3) returning the temperature of the finally cooled marine L-shaped steel to 596-610 ℃, and then allowing the L-shaped steel to enter a cooling bed for air cooling and cooling to room temperature.
The chemical components of the marine L-shaped steel are as follows by weight percent: 0.12 to 0.18%, Si: 0.44-0.5%, Mn: 1.1-1.5%, P: less than or equal to 0.024%, S: less than or equal to 0.025%, Cu: less than or equal to 0.35 percent, Cr: less than or equal to 0.2 percent, Ni: 0.24-0.4%, Nd: 0.03-0.05%, V: 0.06-0.08%, Ti: less than or equal to 0.02 percent, Mo: less than or equal to 0.08 percent, and the balance of Fe and inevitable impurities;
the strength grade of the marine L-shaped steel is DH 32;
the temperature of the finally rolled marine L-shaped steel is 916 ℃;
the specification of the marine L-shaped steel is L400 multiplied by 100 multiplied by 13 multiplied by 18;
the cooling is water cooling;
the cooling intensity is represented by a cooling speed, the cooling intensity of the R angular position is 42-53 ℃/s, the cooling intensity of the positions on two sides of the panel is 39-49 ℃/s, and the cooling intensity of the positions on two sides of the web is 36-44 ℃/s.
The marine L-section steel cooled in this example was slightly bent by the naked eye to an extent of 0.01 m. Under the same other conditions, the marine L-section steel cooled in this example was directly cooled in the cooling bed, and after cooling to room temperature, the marine L-section steel was largely bent toward the panel side, and the bending amount was H0.14 m. It is demonstrated that the cooling effect of the present embodiment is better.
Claims (7)
1. A cooling method for controlling side bending deformation of a marine L-shaped steel after rolling is characterized by comprising the following steps:
step 1: after finishing finish rolling of the unburnt marine L-shaped steel billet, obtaining final-rolled marine L-shaped steel, then carrying out rapid cooling treatment, and applying cooling with different strengths to three parts of the final-rolled marine L-shaped steel, wherein the cooling strength is as follows: the cooling strength of the R angular position > the cooling strength of the two side positions of the panel > the cooling strength of the two side positions of the web plate, the overall cooling speed of the marine L-shaped steel is 30-150 ℃/s, the cooling time is 3-15 s, and the final cooling temperature is 450-710 ℃ to obtain the marine L-shaped steel after final cooling;
step 2: and (3) returning the temperature of the finally cooled marine L-shaped steel to 530-820 ℃, then allowing the L-shaped steel to enter a cooling bed for air cooling and cooling to room temperature, wherein the bending amount of the marine L-shaped steel after air cooling by the cooling bed is 0.01-0.05 m.
2. The cooling method for controlling the lateral bending deformation of the marine L-shaped steel after rolling according to claim 1, wherein the marine L-shaped steel comprises the following chemical components in percentage by weight: 0.11 to 0.18%, Si: 0.27 to 0.5%, Mn: 0.5-1.5%, P: less than or equal to 0.03%, S: less than or equal to 0.03%, Cu: less than or equal to 0.35 percent, Cr: less than or equal to 0.25 percent, Ni: 0.24-0.4%, Nd: less than or equal to 0.05 percent, V: less than or equal to 0.09%, Ti: less than or equal to 0.02 percent, Mo: less than or equal to 0.08 percent, and the balance of Fe and inevitable impurities.
3. The cooling method for controlling the lateral bending deformation of the rolled marine L-shaped steel according to claim 1, wherein the marine L-shaped steel relates to general strength and high strength, and the grades specifically comprise A grade, B grade, D grade, AH 32-AH 40 grade and DH 32-DH 40 grade.
4. The cooling method for controlling the lateral bending deformation of the rolled marine L-shaped steel according to claim 1, wherein the temperature of the finally rolled marine L-shaped steel is 880-930 ℃.
5. The cooling method for controlling the lateral bending deformation of the rolled marine L-shaped steel according to claim 1, wherein the length of the marine L-shaped steel is 20-25 m.
6. The cooling method for controlling the lateral bending deformation of the rolled L-shaped steel for the ship according to claim 1, wherein the cooling is water cooling.
7. The cooling method for controlling the lateral bending deformation of the marine L-shaped steel after rolling according to claim 1, wherein the cooling strength is represented by a cooling speed, the cooling strength at an R-angle position is 30-150 ℃/s, the cooling strength at positions on two sides of a panel is 30-130 ℃/s, and the cooling strength at positions on two sides of a web is 30-110 ℃/s.
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