CN113046653B - Pipeline steel with excellent high heat input welding performance and manufacturing method thereof - Google Patents
Pipeline steel with excellent high heat input welding performance and manufacturing method thereof Download PDFInfo
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- 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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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention discloses a pipeline steel with excellent high heat input welding performance and a manufacturing method thereof, relating to the technical field of steel production, wherein the pipeline steel comprises the following chemical components in percentage by mass: c: 0.030 to 0.060%, Si: 0.10-0.30%, Mn: 1.60-2.00%, P is less than or equal to 0.012%, S is less than or equal to 0.0020%, Ni: 0.10-0.30%, Cr: 0.10% -0.30%, Mo: 0.08-0.30%, Cu: 0.10-0.30%, Al: 0.003-0.012%, Nb: 0.040% -0.080%, Ti: 0.006-0.020%, Mg: 0.0010 to 0.0020 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities. The performance of the steel is improved, the adverse effect of large heat input welding on the material and the welding seam area is improved, and the service performance of the steel pipe is met.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to pipeline steel with excellent high heat input welding performance and a manufacturing method thereof.
Background
With the continuous development of economy, the national demand for energy is continuously promoted, wherein the proportion of petroleum and natural gas resources is higher and higher, the domestic petroleum resources in China are limited and can not meet the national economic development requirements, and therefore, the number of imported petroleum is increased day by day, and the long-distance severe natural environment becomes a normal state. The development of large-caliber thick-wall low-temperature toughness pipelines becomes a new development normal state, the thick-wall large-caliber pipeline steel needs larger current, voltage and welding machine speed in the welding process, and the steel for the large-linear energy welding pipeline has large heat efficiency exchange in a welding area, so that large grains are generated easily, and the damage to products is huge. The development of steel for high heat input welding meets the requirement of customers for high heat input welding, and becomes another important subject of pipeline steel development.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides pipeline steel with excellent high heat input welding performance, which comprises the following chemical components in percentage by mass: c: 0.030 to 0.060%, Si: 0.10-0.30%, Mn: 1.60-2.00%, P is less than or equal to 0.012%, S is less than or equal to 0.0020%, Ni: 0.10-0.30%, Cr: 0.10% -0.30%, Mo: 0.08-0.30%, Cu: 0.10-0.30%, Al: 0.003-0.012%, Nb: 0.040% -0.080%, Ti: 0.006-0.020%, Mg: 0.0010 to 0.0020 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities.
The technical scheme of the invention is further defined as follows:
the pipeline steel with excellent high heat input welding performance comprises the following chemical components in percentage by mass: c: 0.040% -0.060%, Si: 0.10-0.20%, Mn: 1.60-1.8%, P is less than or equal to 0.010%, S is less than or equal to 0.0020%, Ni: 0.10-0.20%, Cr: 0.10% -0.20%, Mo: 0.08-0.15%, Cu: 0.10-0.20%, Al: 0.003-0.010 percent, Nb: 0.040% -0.060%, Ti: 0.006-0.018%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities.
The pipeline steel with excellent high heat input welding performance comprises the following chemical components in percentage by mass: c: 0.035-0.055%, Si: 0.15-0.25%, Mn: 1.70-1.90%, P is less than or equal to 0.011%, S is less than or equal to 0.0020%, and Ni: 0.15-0.25%, Cr: 0.15% -0.25%, Mo: 0.15-0.25%, Cu: 0.15% -0.25%, Al: 0.005% -0.012%, Nb: 0.050% -0.070%, Ti: 0.008% -0.018%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities.
The pipeline steel with excellent high heat input welding performance comprises the following chemical components in percentage by mass: c: 0.030-0.050%, Si: 0.20-0.30%, Mn: 1.80-2.00%, P is less than or equal to 0.012%, S is less than or equal to 0.0020%, Ni: 0.20-0.30%, Cr: 0.20% -0.30%, Mo: 0.13-0.30%, Cu: 0.20-0.30%, Al: 0.003-0.010 percent, Nb: 0.060% -0.080% of Ti: 0.006-0.018%, Mg: 0.0012 to 0.0020 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities.
Another object of the present invention is to provide a method for manufacturing a steel for a line pipe having excellent high heat input weldability, comprising the steps of:
s1, performing desulfurization pretreatment on molten iron by a KR method, skimming slag, and blowing in a converter;
s2, blowing by adopting a top-bottom combined blowing mode, adding nickel, copper and molybdenum alloy into a converter along with scrap steel, and deoxidizing the steel discharged from the converter by adopting a strong deoxidation mode to ensure that the content of aluminum after the converter is 0.020-0.040% and the content of sulfur is less than or equal to 0.008%;
s3, after the molten steel reaches the LF furnace, adding lime and fluorite for slagging, performing desulfurization and alloying treatment after white slag of furnace slag, and hoisting the slag to an RH furnace for vacuum treatment when the components meet the requirements;
s4, carrying out vacuum treatment when the molten steel reaches RH, keeping the vacuum for 20min, carrying out oxygen determination on the molten steel after the vacuum is finished, ensuring that the oxygen content of the molten steel is less than or equal to 5ppm, feeding a magnesium-aluminum wire to a steel ladle at a wire feeding position for treatment, and keeping the static stirring time to be more than or equal to 15min after the magnesium treatment is finished;
s5, lifting the molten steel after static stirring to continuous casting for casting, adopting a gas-permeable nozzle to ensure smooth casting, adopting the processes of electromagnetic stirring and dynamic soft reduction, checking the surface quality of the blank after the blank is cooled in a heap for 48 hours, and processing to ensure that the surface quality meets the requirements;
s6, heating the blank at 1120 +/-10 ℃, calculating the heating time according to the thickness of the blank by 10-13 min/cm, and keeping the soaking time at least for 40min to ensure that elements in the alloy are fully dissolved;
s7, rolling by using a single-stand reversible rolling mill, wherein the initial rolling temperature of rough rolling is 1000-1050 ℃, the secondary rolling temperature is 770-820 ℃, and the final rolling temperature is 740-780 ℃;
s8, the temperature of the steel plate entering water is 730-760 ℃, the temperature of the steel plate returning red is 200-400 ℃, the speed of a cooling roller is 0.30-0.80 m/S, and the acceleration is 0.002-0.012 m/S2。
In the aforementioned method for manufacturing pipeline steel with excellent high heat input welding performance, in step S4, the magnesium content of the magnesium-aluminum wire is 10% to 15%, and the magnesium content after magnesium treatment is 0.0010% to 0.0020%.
The method for manufacturing the pipeline steel with excellent high heat input welding performance has the steel grade of X70-X120, the thickness specification of the product is 25mm or more, and the width specification of the product is 3500mm or more.
The invention has the beneficial effects that:
(1) the invention adopts ultra-low carbon design to increase the ferrite content in the structure, and acicular ferrite is obtained through ultra-fast cooling, thereby improving the low-temperature toughness of the product; the adoption of high manganese can play a role in solid solution strengthening and refine structure grains; nb can remarkably improve the austenite recrystallization temperature, increase the deformation of a non-recrystallization region and form the grain size of a niobium carbonitride refined tissue; the Ni, Cr, Mo and Cu improve the strength and hardenability, and improve the welding performance of the product; the low-aluminum design is adopted, the aluminum content of the steel grade is improved, the reaction rate of magnesium and aluminum inclusions in the steel can be promoted, calcium elements are not added, and the metallurgical effect of the magnesium is effectively improved; magnesium is adopted for treatment, the form of steel inclusions is effectively improved, magnesium reacts with sulfur to form magnesium sulfide, sulfide inclusions in steel are spheroidized, the magnesium activity is high, the magnesium can react with calcium aluminate inclusions to produce magnesium aluminate spinel inclusions, the inclusions are refined, the modified inclusions become austenite nuclear particles, the original austenite grain size can be effectively reduced, the formation of acicular ferrite is facilitated, and the product toughness and welding performance are improved;
(2) the KR desulfurization and converter smelting method is adopted, so that the harm of sulfur is effectively removed, the LF treatment pressure is reduced, and the number and the level of impurities are reduced;
(3) the alloy components in the invention meet the requirements of product strength and grain refinement, and simultaneously improve the hardenability and welding strength of thick-wall specification pipelines;
(4) according to the invention, the addition of calcium and the control of aluminum are cancelled, so that the metallurgical activity of magnesium in steel is improved, and the fine dispersion effect of inclusions is promoted;
(5) in the invention, because of the existence of magnesium inclusions and the existence of magnesium elements in the welding area, fine inclusion particles are easier to form, the aggregation and growth of secondary inclusions in the high-temperature inclusion process are avoided, the strength and the material cleanliness of the welding area are improved, the product quality is improved, and the economic benefit is greatly improved.
Drawings
FIG. 1 is a metallographic structure diagram of example 1 of the present invention.
Detailed Description
Example 1
The pipeline steel with excellent high heat input welding performance provided by the embodiment comprises the following chemical components in percentage by mass: c: 0.050%, Si: 0.22%, Mn: 1.65%, P: 0.008%, S: 0.0012%, Ni: 0.13%, Cr: 0.15%, Mo: 0.12%, Cu: 0.11%, Al: 0.009%, Nb: 0.058%, Ti: 0.012%, Mg: 0.0013%, N: 0.0036%, Ca is not added, and the balance is Fe and inevitable impurities.
The manufacturing method comprises the following steps:
s1, performing desulfurization pretreatment on molten iron by a KR method, skimming slag, and blowing in a converter;
s2, blowing by adopting a top-bottom combined blowing mode, adding nickel, copper and molybdenum alloy into a converter along with scrap steel, and deoxidizing the steel discharged from the converter by adopting a strong deoxidation mode, wherein the content of aluminum is 0.020% and the content of sulfur is 0.006% after the converter is discharged;
s3, after the molten steel reaches the LF furnace, adding lime and fluorite for slagging, performing desulfurization and alloying treatment after white slag of furnace slag, and hoisting the slag to an RH furnace for vacuum treatment when the components meet the requirements;
s4, carrying out vacuum treatment when the molten steel reaches RH, keeping the vacuum for 20min, carrying out oxygen determination on the molten steel after the vacuum is finished to ensure that the oxygen content of the molten steel is 3ppm, feeding a magnesium-aluminum wire to a steel ladle to carry out treatment when the steel ladle reaches a wire feeding position, and standing and stirring for 16min after the magnesium treatment is finished;
s5, lifting the molten steel after static stirring to continuous casting for casting, adopting a gas-permeable nozzle to ensure smooth casting, adopting the processes of electromagnetic stirring and dynamic soft reduction, checking the surface quality of the blank after the blank is cooled in a heap for 48 hours, and processing to ensure that the surface quality meets the requirements;
s6, heating the blank at 1119 ℃, wherein the heating time is calculated according to the thickness of the blank by 11min/cm, and the soaking time is 43min, so that the elements in the alloy are fully dissolved;
s7, rolling by adopting a single-stand reversible rolling mill, wherein the initial rolling temperature of rough rolling is 1030 ℃, the secondary starting temperature is 815 ℃, and the final rolling temperature is 778 ℃;
s8, 756 ℃ of steel plate water inlet temperature, 396 ℃ of red return temperature, 0.75m/S of cooling roller speed and 0.010m/S of acceleration2And by the rapid cooling process after rolling, the structure transformation is effectively promoted, and the formation of the acicular ferrite structure is fully ensured.
Example 2
The difference between the pipeline steel with excellent high heat input welding performance provided by the embodiment and the pipeline steel provided by the embodiment 1 is that the pipeline steel comprises the following chemical components in percentage by mass: c: 0.046%, Si: 0.21%, Mn: 1.73%, P: 0.011%, S: 0.0017%, Ni: 0.17%, Cr: 0.15%, Mo: 0.13%, Cu: 0.12%, Al: 0.012%, Nb: 0.057%, Ti: 0.011%, Mg: 0.0016%, N: 0.0041% of Ca, and the balance of Fe and inevitable impurities.
Example 3
The difference between the pipeline steel with excellent high heat input welding performance provided by the embodiment and the pipeline steel provided by the embodiment 1 is that the pipeline steel comprises the following chemical components in percentage by mass: c: 0.055%, Si: 0.28%, Mn: 1.93%, P: 0.010%, S: 0.0011%, Ni: 0.21%, Cr: 0.22%, Mo: 0.15%, Cu: 0.23%, Al: 0.010%, Nb: 0.075%, Ti: 0.018%, Mg: 0.0019%, N: 0.0033%, Ca is not added, and the balance is Fe and inevitable impurities.
The results of the mechanical property tests of the steel plates of example 1, example 2 and example 3 are shown in the following table:
in conclusion, the invention carries out the design of new components in a targeted manner, adopts the magnesium alloying technology, spheroidizes the manganese sulfide inclusion which harms the pipeline steel for a long time, refines the calcium aluminate inclusion, converts the inclusion from unstable large inclusion into fine magnesium oxide, and becomes the solidification nucleation core of austenite grains after the converted fine inclusion, thereby effectively reducing the original austenite grains, refining the structure grain size of the steel plate, preventing the grains from growing and deteriorating in the welding process of the matrix made of the magnesium material, effectively reducing the adverse effect of welding and improving the quality of the product.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. A pipeline steel with excellent high heat input welding performance is characterized in that: the chemical components and the mass percentage are as follows: c: 0.030 to 0.060%, Si: 0.10-0.30%, Mn: 1.60-2.00%, P is less than or equal to 0.012%, S is less than or equal to 0.0020%, Ni: 0.10-0.30%, Cr: 0.10% -0.30%, Mo: 0.08-0.30%, Cu: 0.10-0.30%, Al: 0.003-0.012%, Nb: 0.040% -0.080%, Ti: 0.006-0.020%, Mg: 0.0010 to 0.0020 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities;
the manufacturing method comprises the following steps:
s1, performing desulfurization pretreatment on molten iron by a KR method, skimming slag, and blowing in a converter;
s2, blowing by adopting a top-bottom combined blowing mode, adding nickel, copper and molybdenum alloy into a converter along with scrap steel, and deoxidizing the steel discharged from the converter by adopting a strong deoxidation mode to ensure that the content of aluminum after the converter is 0.020-0.040% and the content of sulfur is less than or equal to 0.008%;
s3, after the molten steel reaches the LF furnace, adding lime and fluorite for slagging, performing desulfurization and alloying treatment after white slag of furnace slag, and hoisting the slag to an RH furnace for vacuum treatment when the components meet the requirements;
s4, carrying out vacuum treatment when the molten steel reaches RH, keeping the vacuum for 20min, carrying out oxygen determination on the molten steel after the vacuum is finished, ensuring that the oxygen content of the molten steel is less than or equal to 5ppm, feeding a magnesium-aluminum wire to a steel ladle at a wire feeding position for treatment, and keeping the static stirring time to be more than or equal to 15min after the magnesium treatment is finished;
s5, lifting the molten steel after static stirring to continuous casting for casting, adopting a gas-permeable nozzle to ensure smooth casting, adopting the processes of electromagnetic stirring and dynamic soft reduction, checking the surface quality of the blank after the blank is cooled in a heap for 48 hours, and processing to ensure that the surface quality meets the requirements;
s6, heating the blank at 1120 +/-10 ℃, calculating the heating time according to the thickness of the blank by 10-13 min/cm, and keeping the soaking time at least for 40min to ensure that elements in the alloy are fully dissolved;
s7, rolling by using a single-stand reversible rolling mill, wherein the initial rolling temperature of rough rolling is 1000-1050 ℃, the secondary rolling temperature is 770-820 ℃, and the final rolling temperature is 740-780 ℃;
s8, the steel plate entry temperature is 730-760 ℃, the temperature of red returning is 200-400 ℃, the cooling roll speed is 0.30-0.80 m/S, and the acceleration is 0.002-0.012 m/S.
2. The steel for line pipe excellent in high heat input weldability according to claim 1, characterized in that: the chemical components and the mass percentage are as follows: c: 0.040% -0.060%, Si: 0.10-0.20%, Mn: 1.60-1.8%, P is less than or equal to 0.010%, S is less than or equal to 0.0020%, Ni: 0.10-0.20%, Cr: 0.10% -0.20%, Mo: 0.08-0.15%, Cu: 0.10-0.20%, Al: 0.003-0.010 percent, Nb: 0.040% -0.060%, Ti: 0.006-0.018%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities.
3. The steel for line pipe excellent in high heat input weldability according to claim 1, characterized in that: the chemical components and the mass percentage are as follows: c: 0.035-0.055%, Si: 0.15-0.25%, Mn: 1.70-1.90%, P is less than or equal to 0.011%, S is less than or equal to 0.0020%, and Ni: 0.15-0.25%, Cr: 0.15% -0.25%, Mo: 0.15-0.25%, Cu: 0.15% -0.25%, Al: 0.005% -0.012%, Nb: 0.050% -0.070%, Ti: 0.008% -0.018%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities.
4. The steel for line pipe excellent in high heat input weldability according to claim 1, characterized in that: the chemical components and the mass percentage are as follows: c: 0.030-0.050%, Si: 0.20-0.30%, Mn: 1.80-2.00%, P is less than or equal to 0.012%, S is less than or equal to 0.0020%, Ni: 0.20-0.30%, Cr: 0.20% -0.30%, Mo: 0.13-0.30%, Cu: 0.20-0.30%, Al: 0.003-0.010 percent, Nb: 0.060% -0.080% of Ti: 0.006-0.018%, Mg: 0.0012 to 0.0020 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities.
5. The steel for line pipe excellent in high heat input weldability according to claim 1, characterized in that: in the step S4, the magnesium content of the magnesium-aluminum wire is 10% -15%, and the magnesium content is 0.0010% -0.0020% after the magnesium treatment is finished.
6. The steel for line pipe excellent in high heat input weldability according to claim 1, characterized in that: the steel grade of the product is X70-X120 grade, the thickness specification of the product is 25mm or more, and the width specification of the product is 3500mm or more.
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| CN114182170A (en) * | 2021-11-22 | 2022-03-15 | 燕山大学 | X80-grade hot-bending elbow with excellent welding performance and manufacturing method thereof |
| CN116426831A (en) * | 2023-05-31 | 2023-07-14 | 南京钢铁股份有限公司 | Steel for thick-wall low-temperature deep sea pipeline and production method thereof |
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