CN115351094A - Production method of carbon structural steel for pipe making with low welding crack sensitivity - Google Patents
Production method of carbon structural steel for pipe making with low welding crack sensitivity Download PDFInfo
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- CN115351094A CN115351094A CN202210743748.5A CN202210743748A CN115351094A CN 115351094 A CN115351094 A CN 115351094A CN 202210743748 A CN202210743748 A CN 202210743748A CN 115351094 A CN115351094 A CN 115351094A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
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Abstract
The invention relates to a production method of carbon structural steel for manufacturing a pipe with low welding crack sensitivity, which comprises the following steps of slowly cooling a carbon structural steel billet in a cold charging furnace for more than 48 hours; heating the carbon structural steel billet after slow cooling by controlling the temperature in the heating furnace, wherein the heating time is ensured to be more than 120min, and the heating temperature reaches about 1100 ℃; the heated carbon structural steel is subjected to rough rolling through a rough rolling mill; accurately rolling the rough-rolled carbon structural steel by a finishing mill according to the required size, wherein the final rolling temperature is set to be 840-870 ℃ during the final accurate rolling; after finishing the finish rolling, the carbon structural steel is coiled by a coiler, the grain size refinement is ensured by adding Ti alloy according to a set reasonable temperature system, a deformation system and a cooling system, the cold bending property of the material is increased, better welding performance requirements can be obtained, and the strength is ensured to reach the standard.
Description
Technical Field
The invention relates to the technical field of production of carbon structural steel, in particular to a production method of carbon structural steel for manufacturing a pipe with low welding crack sensitivity.
Background
As is known, the carbon structural steel is structural steel with carbon content of about 0.05-0.70% and individually up to 0.90%, and can be divided into two types of common carbon structural steel and high-quality carbon structural steel, during the welding process of the carbon structural steel pipe, welding cracks are common welding process defects, the welding crack sensitivity index is an important index for judging the welding performance of the carbon structural steel, Q235B-Ti is a carbon structural steel base with carbon content Wc of 0.04-0.07%, and is finished by adding a small amount of Ti alloy elements, the toughness is higher than that of the common carbon structural steel, and meanwhile, the carbon structural steel has good welding performance and cold and hot pressure processing performance. Compared with carbon structural steel, the steel has the advantages of high strength, good comprehensive performance, long service life, wide application range, economy and the like, and the steel is rolled into a steel coil and widely applied to bridges, boilers, vehicles and important building structures.
The low-qualified alloy high-strength series produced by steel enterprises at present have large market demand, are widely applied to various steel structures such as engineering machinery, mine supports and the like, because the smelting and rolling processes are relatively simple, production enterprises strive for the market share of the products to the utmost extent, medium-carbon and medium-manganese component systems which are used for a long time are generally adopted at present, the steel structures are produced in a controlled rolling or controlled rolling and controlled cooling mode, mn (manganese) is basically used as a main alloy for strengthening, the microalloying technology is a novel metallurgical subject appearing in the 70 th century in 20 th, microalloying steel is a low-cost and high-technology steel product produced by adopting a modern metallurgical production process, the microalloying steel becomes an indispensable important steel material widely applied to wheels, machinery, engineering steel and the like, the microalloying technology is an important mark for converting the traditional steel production into the modern metallurgical production, carbon and nitride have dissolving and precipitation behaviors in steel heating, cooling and deformation processes by adding Ti, the steel has obvious influence on the physical, chemical properties and mechanical properties of steel, the carbon and nitride have prominent effect on improving the toughness and toughness of large-size pieces and medium-strength, and the titanium alloy, and the microalloying technology only plays a good role of adding Ti and is a low-titanium alloy with a low-titanium-1V alloy and low-titanium alloy price/low-1-V alloy.
At present, the single titanium microalloying is less in application, the main reason is that the chemical property of titanium is quite active and is easy to combine with impurity elements such as O, N, S in steel to form a compound with larger size, so that fluctuation of chemical components is caused by fluctuation of O, N, S mass fraction in steel, and finally product performance is fluctuated.
Disclosure of Invention
Technical scheme (I)
Based on the problems in the background art, the invention provides a production method of carbon structural steel for manufacturing a pipe with low welding crack sensitivity.
The invention provides a production method of carbon structural steel for manufacturing a pipe with low welding crack sensitivity, which comprises the following steps:
s1: firstly, placing carbon structural steel billets to be processed into a cold charging furnace, closing a furnace door of the cold charging furnace, starting the cold charging furnace to reduce the temperature of the cold charging furnace, realizing slow cooling of the carbon structural steel billets in the cold charging furnace, and keeping constant temperature and slow cooling for not less than 48 hours;
s2: secondly, moving the slowly cooled carbon structural steel to the inside of a control heating furnace, and heating the carbon structural steel billet by controlling the temperature in the heating furnace, so that the heating time is ensured to be 120-150 min, and the heating temperature is 1000-1150 ℃;
s3: further taking out the heated carbon structural steel, moving the heated carbon structural steel to a roughing mill, starting the coordination between the roughing mill and workers, and carrying out roughing rolling on the carbon structural steel, wherein in the rolling process, after the surface temperature of the carbon structural steel is reduced to be below 800 ℃, the carbon structural steel needs to be repeatedly heated through a heating furnace and is rolled for multiple times until the roughing rolling is finished;
s4: further moving the carbon structural steel after the rough rolling to a finishing mill, precisely rolling the carbon structural steel according to the size to be rolled, and in the rolling process, when the surface temperature of the carbon structural steel is reduced to be below 800 ℃, repeatedly heating the carbon structural steel by a heating furnace, and then rolling the carbon structural steel, wherein the key point is that the rolling finishing temperature of the carbon structural steel is set to be 840 ℃ to 870 ℃ during the last precise rolling;
s5: and in the last step, after the finishing mill rolls the carbon structural steel billet, the carbon structural steel is coiled by a coiling machine.
Preferably, the rolling reduction of the rough rolling mill in the average pass is 20% to 26%, and the reduction of at least one pass is not lower than 22%.
Furthermore, in the rolling process of the finishing mill, the accumulated deformation rate is not lower than 80%.
Further, the coiling machine adopts rear end cooling in the coiling process, and the coiling temperature during coiling is controlled at 620 +/-15 ℃.
(II) advantageous effects
Compared with the prior art, the invention provides a production method of carbon structural steel for pipe making with low welding crack sensitivity, which has the following beneficial effects:
according to the invention, according to the solid solution precipitation rule of titanium carbonitride in the heating and controlled rolling and controlled cooling processing process of the carbon structural steel, the cold bending property of the material is increased by increasing Ti alloy to ensure grain size refinement through the cooperation of a cold charging furnace, a roughing mill, a finishing mill and a coiling machine and according to the set reasonable temperature system, deformation system and cooling system, and better welding performance requirements can be obtained, the strength is ensured to reach the standard, and the aim of stabilizing the production rhythm basically the same as the SPHC steel is fulfilled.
Drawings
FIG. 1 is a schematic view of the process structure of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Examples
Referring to fig. 1, the invention provides a technical scheme of a production method of carbon structural steel for manufacturing a pipe with low welding crack sensitivity, which is characterized by comprising the following steps:
s1: firstly, placing carbon structural steel billets to be processed into a cold charging furnace, closing a furnace door of the cold charging furnace, starting the cold charging furnace to reduce the temperature of the cold charging furnace, realizing slow cooling of the carbon structural steel billets in the cold charging furnace, and keeping constant temperature and slow cooling for not less than 48 hours;
s2: secondly, moving the slowly cooled carbon structural steel to the inside of a control heating furnace, and heating the carbon structural steel billet by controlling the temperature in the heating furnace, so that the heating time is ensured to be 120-150 min, and the heating temperature is 1000-1150 ℃;
s3: further taking out the heated carbon structural steel, moving the heated carbon structural steel to a roughing mill, starting the coordination between the roughing mill and workers, and carrying out roughing rolling on the carbon structural steel, wherein in the rolling process, after the surface temperature of the carbon structural steel is reduced to be below 800 ℃, the carbon structural steel needs to be repeatedly heated through a heating furnace and is rolled for multiple times until the roughing rolling is finished;
s4: further moving the carbon structural steel after the rough rolling to a finishing mill, precisely rolling the carbon structural steel according to the size to be rolled, and in the rolling process, when the surface temperature of the carbon structural steel is reduced to be below 800 ℃, repeatedly heating the carbon structural steel by a heating furnace, and then rolling the carbon structural steel, wherein the key point is that the rolling finishing temperature of the carbon structural steel is set to be 840 ℃ to 870 ℃ during the last precise rolling;
s5: and in the last step, after the carbon structural steel billet is rolled by the finishing mill, the carbon structural steel is coiled by a coiling machine.
In this embodiment, specifically: in S1, when the carbon steel billet is slowly cooled, the carbon steel billet is set to be in 48 hours, so that the carbon steel billet is mainly and completely cooled, the temperature gradient of the surface layer of a casting blank is reduced, the phase change stress is not increased, the generation of microcracks on the surface of the casting blank is reduced, the probability of defects of the carbon structural steel billet during rolling is reduced, and the rolling effect is improved.
In this embodiment, specifically: in S2, when the carbon billet is heated before rolling, the heating time is set to be 120min to 150min, mainly according to different heating furnace powers, the heating time and the size of the carbon billet are properly adjusted, the carbon billet is heated to be 1000 ℃ to 1150 ℃, forging is carried out when the heating is less than 1000 ℃, the impurities in the carbon billet are not convenient to remove, the TiN particles in the carbon billet are slowly separated out due to too low temperature, the existence of the TiN particles in the carbon billet is the starting point of billet cracks, the particle size of TiN in the carbon billet when the carbon billet is heated to be 1000 ℃ to 1150 is generally 10-100nm, austenite deformation can be effectively promoted, when the heating temperature is higher than 1150 ℃, the impurities in the carbon billet can be removed, meanwhile, the TiN particles are separated out to form coarse particles, the coarse particles with the size of more than 500nm are generally particles, the TiN particles are easily formed in the carbon billet, and the performance of the product is influenced.
In this embodiment, specifically: in S3-S4, in the rolling process of a roughing mill, the rolling reduction of an average pass is controlled to be 20-26%, the pressing reduction of at least one pass is not lower than 22%, in the rolling process of a finishing mill, the accumulated deformation rate is not lower than 80%, after 0.10% of titanium is added into steel in the rolling process, the size of TiC precipitated particles and the average distance of the precipitated particles are reduced along with the increase of Mn content in a carbon steel billet, the structural uniformity of the carbon steel billet can be well improved and the cold bending forming performance of the steel is improved by setting the rolling requirement in the rolling process, when the pressing reduction and the deformation rate do not reach the standard in the rolling process, the structural uniformity of the carbon steel billet is poor, the quality of a produced product is poor, and when the pressing reduction and the deformation rate are too high in the rolling process, the working pressure of rolling equipment is greatly increased.
In this embodiment, specifically: in S5, the coiling machine adopts rear end cooling in the coiling process, the coiling temperature during coiling is controlled at 620 +/-15 ℃, and when the coiling temperature is controlled at 620 +/-15 ℃, more fine TiC in the carbon structural steel can be effectively separated out in the subsequent cooling and coiling processes, and the precipitation strengthening effect is better.
To sum up, the production method of the carbon structural steel for manufacturing the tube with low welding crack sensitivity is based on the research of the heating, rolling and cooling control process of the Ti steel in low Mn, sets a reasonable temperature system, a deformation system and a cooling system according to the solid solution precipitation rule of titanium carbonitride, and is in the core technology which is crucial to the structure performance of the product, mainly controls the precipitation form and size of steel TiN through the heating and rolling stages, develops the research of the inhibition effect of manganese on the austenite transformation induced TiC precipitation of titanium-containing micro-alloy steel, aims at improving the structure uniformity of a steel plate and the cold bending processing forming performance of the steel, and optimizes the rolling and cooling control process, and the main technology comprises the following steps: 1. a heating control technique using a TiN precipitation form as a control target; 2. controlled rolling and cooling technology with the aim of grain refinement and TiC precipitation strengthening; 3. the flexible rolling control technology with the aim of improving the organization form in the steel is characterized in that a cold charging furnace, a roughing mill, a finishing mill and a coiling machine are matched, and according to the set reasonable temperature system, deformation system and cooling system, ti alloy is added to ensure that the grain size is refined and the cold bending property of the material is increased, so that the better welding performance requirement can be obtained, the strength can reach the standard, the production rhythm relation basically the same as that of the SPHC steel can be met, and the aim of stabilizing the production rhythm is fulfilled.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A production method of carbon structural steel for manufacturing tubes with low welding crack sensitivity is characterized by comprising the following steps:
s1: firstly, placing carbon structure steel billets to be treated into a cold charging furnace, closing a furnace door of the cold charging furnace, starting the cold charging furnace to reduce the temperature of the cold charging furnace, realizing slow cooling of the carbon structure steel billets in the cold charging furnace, and keeping constant temperature and slow cooling for not less than 48 hours;
s2: secondly, moving the slowly cooled carbon structural steel to the inside of a control heating furnace, and heating the carbon structural steel billet by controlling the temperature in the heating furnace, so that the heating time is ensured to be 120-150 min, and the heating temperature is 1000-1150 ℃;
s3: further taking out the heated carbon structural steel, moving the heated carbon structural steel to a roughing mill, starting the coordination between the roughing mill and workers, and carrying out roughing rolling on the carbon structural steel, wherein in the rolling process, after the surface temperature of the carbon structural steel is reduced to be below 800 ℃, the carbon structural steel needs to be repeatedly heated by a heating furnace and is rolled for multiple times until the roughing rolling is finished;
s4: further moving the carbon structural steel after the rough rolling to a finishing mill, precisely rolling the carbon structural steel according to the size to be rolled, and in the rolling process, when the surface temperature of the carbon structural steel is reduced to be below 800 ℃, repeatedly heating the carbon structural steel through a heating furnace, and then rolling the carbon structural steel, wherein the key point is that the rolling finishing temperature of the carbon structural steel is set to be 840 ℃ to 870 ℃ during the last precise rolling;
s5: and in the last step, after the carbon structural steel billet is rolled by the finishing mill, the carbon structural steel is coiled by a coiling machine.
2. The method for producing carbon structural steel for pipe making with low weld crack sensitivity as claimed in claim 1, wherein the reduction rate of the average pass during the roughing rolling is 20% to 26%, and the reduction rate of the minimum pass is not less than 22%.
3. The method for producing a carbon structural steel for pipe making with low weld crack sensitivity as claimed in claim 1, wherein the cumulative deformation rate during the rolling of the finishing mill is not less than 80%.
4. The method for producing a carbon structural steel for pipe production with low weld crack sensitivity as claimed in claim 1, wherein the coiling temperature during coiling is controlled to 620 ± 15 ℃ by using back end cooling in the coiling process of the coiler.
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| CN202210743748.5A CN115351094A (en) | 2022-06-28 | 2022-06-28 | Production method of carbon structural steel for pipe making with low welding crack sensitivity |
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