CN115029635A - Large heat input welding high-strength storage tank steel plate and production method thereof - Google Patents

Large heat input welding high-strength storage tank steel plate and production method thereof Download PDF

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CN115029635A
CN115029635A CN202210699996.4A CN202210699996A CN115029635A CN 115029635 A CN115029635 A CN 115029635A CN 202210699996 A CN202210699996 A CN 202210699996A CN 115029635 A CN115029635 A CN 115029635A
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steel plate
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刘立彪
周文浩
史术华
张计谋
汪后明
徐琛
龙安辉
杜豪
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Hunan Valin Xiangtan Iron and Steel Co Ltd
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Hunan Valin Xiangtan Iron and Steel Co Ltd
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    • C21D2211/00—Microstructure comprising significant phases
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Abstract

The steel plate comprises the chemical components of, by mass, C = 0.07-0.09, Si = 0.15-0.25, Mn = 1.48-1.55, P is less than or equal to 0.012, S is less than or equal to 0.003, V = 0.042-0.045, Ni = 0.32-0.36, Mo = 0.10-0.14, Ti = 0.020-0.030, Nb is less than or equal to 0.005, Cr is less than or equal to 0.10, Cu is less than or equal to 0.05, B is less than or equal to 0.0005, Alt = 0.030-0.060, and the balance of Fe and inevitable impurities; the welding sensitivity coefficient Pcm is less than or equal to 0.21. The production process flow comprises converter smelting, LF refining, RH furnace treatment, continuous casting, slab heating, rolling, quenching and tempering heat treatment. The normal-temperature tensile ReL of the steel is more than or equal to 490MPa, Rm = 610-730 MPa, and A is more than or equal to 17%; -20 ℃ transverse impact AKV 2 The average value is more than or equal to 80J; the impact energy of a Heat Affected Zone (HAZ) of the steel plate after 400KJ/cm linear energy welding at the temperature of-20 ℃ is more than or equal to 60J, and the steel plate has good strength, toughness and large linear energy welding resistance.

Description

Large heat input welding high-strength storage tank steel plate and production method thereof
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a high heat input welding high-strength storage tank steel plate and a production method thereof.
Background
The large heat input welding technology can obviously improve the welding efficiency, reduce the manufacturing cost and save energy. However, as equipment is enlarged, the strength requirement of the steel plate is improved; with the increase of the strength of the steel plate, the impact toughness and the welding performance of the steel plate are reduced, and the welding crack sensitivity is increased. In particular, the weld line energy is increased, the structure of the weld heat affected zone of the conventional low alloy steel is significantly increased, the strength and toughness of the weld heat affected zone are significantly deteriorated, and weld cracks are easily generated. Meanwhile, as the strength and thickness of the steel sheet increase, the carbon equivalent thereof tends to increase, which is another cause of deterioration of the weld heat-affected properties and enhancement of weld crack sensitivity. The development of steel sheets suitable for high heat input welding, having high strength, high toughness and low weld crack sensitivity is an important topic of steel research worldwide. At present, steel for the oil storage tank is applied on a large scale, but a steel plate for a large-line energy welding storage tank for constructing a large storage tank with the length of 15 ten thousand cubic meters is weak.
In recent years, studies on high-strength high-heat-input steel sheets have been increasing, but these steel sheets have some disadvantages.
Chinese patent CN10128972B discloses a low yield ratio high-heat input welding high-strength high-toughness steel plate and a manufacturing method thereof, wherein the steel plate adopts a microalloy design of low carbon-high Mn and Nb + Ti, the ratio of Ti/N is 3.0-4.0, and the ratio of Ca/S is 0.8-3.0, and the main defects are that the ratio of Ti/N is difficult to control at 3.0-4.0 and the ratio of Ca/S is controlled at 0.8-3.0 during large-scale industrial production, and the main reasons are that the influence factors of the nitrogen content in molten steel are very many and the fluctuation is large. The stable control of the N content requires strict control from various aspects such as raw materials, processes and the like, so that the cost is higher and the smelting period is longer. Secondly, the content of Ca in molten steel is generally increased by feeding calcium lines, but the yield of Ca is extremely unstable and uncontrollable in the mode.
The steel plate suitable for welding with extra large heat input disclosed in Chinese patent CN109321817A and the manufacturing method thereof need to control the oxygen content in the steel seriously, and needs to add REM when the oxygen content is 90ppm, and add Mg, Ti and V when the oxygen content is 50ppm, so as to ensure that the inclusion in the steel is not 0.5-5 um.. In other patents of high-linear energy steel, the available oxide metallurgy methods of Ti, Mg, Zr, rare earth and the like need to accurately control the oxygen content and Ti/N, Ca/S, Ti/O in the refining and smelting process, and have the defects of high cost of using precious alloy, long smelting period, complex smelting process, difficult control and the like.
Therefore, the design, development and smelting process is simple, the manufacturing cost is low, and the method has great significance for large storage tank high-strength steel plates suitable for large heat input welding.
Disclosure of Invention
The invention aims to provide a production method for welding a high-strength storage tank steel plate by high heat input, which can adapt to the high heat input welding of 400 KJ/cm.
The technical scheme of the invention is as follows:
the large heat input welding high-strength storage tank steel plate comprises the production process flows of converter smelting, LF refining, RH furnace treatment, continuous casting, plate blank heating, rolling, quenching and tempering heat treatment, and the steel comprises the following chemical components in percentage by mass: c = 0.07-0.09, Si = 0.15-0.25, Mn = 1.48-1.55, P is less than or equal to 0.012, S is less than or equal to 0.003, V = 0.042-0.045, Ni = 0.32-0.36, Mo = 0.10-0.14, Ti = 0.020-0.030, Nb is less than or equal to 0.005, Cr is less than or equal to 0.10, Cu is less than or equal to 0.05, B is less than or equal to 0.0005, Alt = 0.030-0.060, and the balance of Fe and inevitable impurities; the welding sensitivity coefficient Pcm is less than or equal to 0.21; the mechanical properties of the steel plate are as follows: the normal-temperature stretching ReL is more than or equal to 490MPa, Rm = 610-730 MPa, and A is more than or equal to 17%; -20 ℃ transverse impact AKV 2 The average value is more than or equal to 80J; meanwhile, the requirement that the impact energy of the Heat Affected Zone (HAZ) -20 ℃ of the steel plate is more than or equal to 60J after the welding is carried out at the heat input of 400-500 KJ.
The production method of the large heat input welding storage tank steel plate comprises the key process steps of:
a. steel making: slag-stopping and tapping in the converter, wherein the tapping C is more than or equal to 0.04 percent, and the tapping P is less than or equal to 0.012 percent; LF refining: keeping the white slag for more than 15min, controlling S to be less than or equal to 0.005 percent, adding Ti to adjust the Ti content after oxygen is determined to be less than or equal to 5ppm, and feeding pure calcium line for calcium treatment of more than or equal to 200 meters before leaving the station; RH furnace treatment: the holding time is more than or equal to 15min under the condition that the vacuum degree is less than or equal to 0.5 tor; the soft argon blowing time is more than or equal to 15 min; TiO with particle diameter of 200nm is fed immediately after the soft blowing is finished 2 Nano powder cored wire200-250 m, the wire feeding speed is more than or equal to 200m/min, RH vacuum circulation is carried out for 8-10min after wire feeding is finished, bottom blowing argon is closed after the wire is broken, and the continuous casting and pouring are carried out;
b. rolling: the tapping temperature is 1180-1220 ℃, the first-stage initial rolling temperature is more than or equal to 1050 ℃, the first-stage final rolling temperature is more than 980 ℃, the final three-stage reduction rate is ensured to be more than 20%, the intermediate blank thickness is more than or equal to 2 times of the thickness of the finished product, the second-stage initial rolling temperature is less than or equal to 870 ℃, the final rolling temperature is 770-820 ℃, and the red return temperature is 670-720 ℃;
c. and (3) heat treatment: adopting a quenching and tempering heat treatment process, controlling the quenching temperature at 900-920 ℃, keeping the temperature for 10-20 min, and then quenching with water by using a quenching machine; tempering at 650-680 ℃, keeping the temperature for 30-60 min, and then air cooling.
The calculation formula of the welding sensitivity coefficient Pcm is as follows:
Pcm=C+Si/30+(Mn+Cr+Cu)/20+Ni/60+Mo/15+V/10+5B。
the invention has the beneficial effects that: through reasonable chemical composition design, the cleanliness of steel is ensured through LF refining and vacuum degassing treatment processes, and then nano TiO is fed 2 The special treatment of (2); by forming Ti-X-O fine and dispersed composite inclusion particles, coarsening of a welded structure can be inhibited under high-heat-input welding, and formation of acicular ferrite is promoted. Finally, the normal-temperature tensile ReL is more than or equal to 490MPa, Rm = 610-730 MPa, and A is more than or equal to 17%; -20 ℃ transverse impact AKV 2 The average value is more than or equal to 80J; and the impact energy of a Heat Affected Zone (HAZ) of the steel plate at the temperature of-20 ℃ is more than or equal to 60J after the welding with the heat input of 400KJ/cm, and the steel for the storage tank with the thickness of 10-50mm has good strength and toughness and large heat input welding resistance.
Drawings
FIG. 1 is a metallographic structure diagram of a steel plate according to example 2.
FIG. 2 is a metallographic structure diagram of a weld HAZ in example 2.
Detailed Description
The present invention will be described in further detail with reference to examples. The smelting components of each example are shown in the table 1, and the performance detection results are shown in the table 2.
Example 1
The production of the large heat input welding high-strength storage tank steel plate comprises the key process steps of:
a. steel making: converter tapping C =0.05%, and P = 0.010%. Keeping the LF refining white slag for 18min, keeping the LF refining white slag in an LF furnace S =0.0032%, when the oxygen content is determined to be 4ppm, adding a proper amount of Ti iron according to the residual Ti content of molten steel, and feeding a pure calcium line for 300m after 3 minutes; after the RH furnace enters a station, firstly keeping the RH furnace for more than or equal to 15min under the condition that the vacuum degree is less than or equal to 0.5tor, then carrying out soft argon blowing for 16min, then feeding a 200m nano TiO2 wire, immediately carrying out vacuum circulation for 8min, closing argon after breaking the air, and carrying out pouring on the upper stage;
b. rolling: the tapping temperature is 1190 ℃, the initial rolling temperature of the first stage is 1060 ℃, the reduction rates of the last three passes are respectively 21%, 21% and 20%, the final rolling temperature is 990 ℃, and the thickness of the rolled intermediate billet is 95 mm. The second stage is at the initial rolling temperature of 850 ℃, the accumulated reduction rate of 51 percent, the final rolling temperature of 790 ℃, the re-reddening temperature of 682 ℃ and the thickness of a rolled finished product of 32 mm;
c. and (3) heat treatment: heating the steel plate from room temperature to 910 ℃, preserving heat for 20 minutes, and then quenching the steel plate to room temperature by a quenching machine; tempering at 670 deg.C, holding for 35 min, and air cooling. And finally obtaining the steel plate, sampling the head and the tail of the steel plate to detect the performance, and taking the test plate to perform electrogas welding according to 400 KJ/cm.
Example 2:
the production of high heat input welding high strength steel plate for storage tank includes the following key steps:
a. steel making: and (3) converter tapping C =0.06%, and P = 0.008%. Keeping the LF refining white slag for 18min, keeping the LF furnace S =0.0024%, adding a proper amount of Ti-Fe according to the residual Ti content of molten steel when the oxygen content is 4ppm, and feeding a pure calcium line for 300m after 3 minutes; after the RH furnace enters the station, keeping the RH furnace at the vacuum degree of less than or equal to 0.5tor for more than or equal to 15min, then soft blowing argon for 17min, feeding a 220m nanometer TiO2 wire, immediately performing vacuum circulation for 8min, closing the argon after breaking the air, and performing top pouring;
b. rolling: the tapping temperature is 1192 ℃, the first-stage starting rolling temperature is 1060 ℃, the final three-pass reduction rates are 21%, 22% and 20%, the final rolling temperature is 1005 ℃, and the thickness of the rolled intermediate billet is 80 mm. The second stage is at the initial rolling temperature of 860 ℃, the cumulative reduction rate of 49 percent and the final rolling temperature of 810 ℃, and the thickness of a rolled product is 21.5 mm;
c. and (3) heat treatment: heating the steel plate from room temperature to 900 ℃, preserving heat for 13 minutes, and then quenching the steel plate to room temperature by a quenching machine; tempering at 680 ℃, preserving the heat for 30 minutes, and then air cooling; and finally obtaining the steel plate, sampling the head and the tail of the steel plate to detect the performance, and taking the test plate to perform electrogas welding according to 400 KJ/cm.
The metallographic structure of the steel plate is shown in figure 1, and the metallographic structure of the welded HAZ is shown in figure 2.
Table 1 chemical composition (wt.%) of the steels of the examples
Figure 143898DEST_PATH_IMAGE001
。
TABLE 2 Performance test results of the steels of the examples
Figure 468175DEST_PATH_IMAGE002
。
As shown in Table 1, the weld crack susceptibility Pcm of each example was less than 0.21%.
As shown in FIG. 1, the steel of the present invention has a stable tempered sorbite structure and a grain size of at least 8 grades.
As shown in FIG. 2, the HAZ structure of the steel of the present invention after welding at a heat input of 400KJ/cm was acicular ferrite.
As shown in Table 2, the room-temperature tensile ReL of each example is not less than 490MPa, Rm = 610-730 MPa, and A is not less than 17%; -20 ℃ transverse impact AKV 2 Average value is more than or equal to 80J, and AKV is impacted at-20 ℃ in a welding Heat Affected Zone (HAZ) after 400KJ/cm linear energy electrogas vertical welding 2 The average value is more than or equal to 60J. The steel has good strength and low-temperature toughness, good large heat input resistance (400 KJ/cm) weldability, meets various mechanical property requirements, has good internal and surface quality, and can be used for manufacturing large-scale oil storage tanks.

Claims (2)

1. The large linear energy high-strength welded storage tank steel plate is produced by the following processes of converter smelting, LF refining, RH furnace treatment, continuous casting, slab heating, rolling, quenching and tempering heat treatment, and is characterized in that: the steel comprises the following chemical components, by mass, C = 0.07-0.09, Si = 0.15-0.25, Mn = 1.48-1.55, P ≤ 0.012, S ≤ 0.003, V = 0.042-0.045, Ni = 0.32-0.36, Mo = 0.10-0.14, and Ti = 0.02-0.090-0.030, Nb is less than or equal to 0.005, Cr is less than or equal to 0.10, Cu is less than or equal to 0.05, B is less than or equal to 0.0005, Alt = 0.030-0.060, and the balance of Fe and inevitable impurities; the welding sensitivity coefficient Pcm is less than or equal to 0.21; the mechanical properties of the steel plate are as follows: the normal-temperature stretching ReL is more than or equal to 490MPa, Rm = 610-730 MPa, and A is more than or equal to 17%; -20 ℃ transverse impact AKV 2 The average value is more than or equal to 80J; meanwhile, the requirement that the impact energy of a Heat Affected Zone (HAZ) -20 ℃ of the steel plate is more than or equal to 60J after welding at the heat energy of 400-500KJ is met.
2. The method for producing the large heat input high strength welded storage tank steel plate according to claim 1, characterized by comprising the following key process steps:
a. steel making: slag-stopping and tapping in the converter, wherein the tapping C is more than or equal to 0.04 percent, and the tapping P is less than or equal to 0.012 percent; LF refining: keeping the white slag for more than 15min, controlling S to be less than or equal to 0.005 percent, adding Ti to adjust the Ti content after oxygen is determined to be less than or equal to 5ppm, and feeding pure calcium line for calcium treatment of more than or equal to 200 meters before leaving the station; RH furnace treatment: the holding time is more than or equal to 15min under the condition that the vacuum degree is less than or equal to 0.5 tor; the soft argon blowing time is more than or equal to 15 min; TiO with particle diameter of 200nm is fed immediately after the soft blowing is finished 2 200-250 m of nano powder cored wire, wherein the wire feeding speed is more than or equal to 200m/min, RH vacuum circulation is carried out for 8-10min after the wire feeding is finished, bottom blowing argon is closed after the wire feeding is broken, and the wire is hung to continuous casting and pouring;
b. rolling: the tapping temperature is 1180-1220 ℃, the initial rolling temperature of the first stage is more than or equal to 1050 ℃, the final rolling temperature of the first stage is more than 980 ℃, the final reduction rate of the three passes is more than 20%, the thickness of the intermediate blank is more than or equal to 2 times of the thickness of the finished product, the initial rolling temperature of the second stage is less than or equal to 870 ℃, the final rolling temperature is 770-820 ℃, and the red return temperature is 670-720 ℃;
c. and (3) heat treatment: adopting a quenching and tempering heat treatment process, controlling the quenching temperature at 900-920 ℃, keeping the temperature for 10-20 min, and then quenching with water by using a quenching machine; tempering temperature is 650-680 ℃, heat preservation time is 30-60 min, and then air cooling is carried out.
CN202210699996.4A 2022-06-21 2022-06-21 Large heat input welding high-strength storage tank steel plate and production method thereof Pending CN115029635A (en)

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CN115786820A (en) * 2022-11-29 2023-03-14 南京钢铁股份有限公司 Manufacturing method of P690QL2 marine storage tank steel
CN116574981A (en) * 2023-04-24 2023-08-11 舞阳钢铁有限责任公司 High-quality steel plate for low-temperature oil storage tank and production method thereof
CN117026093A (en) * 2023-09-16 2023-11-10 湖南华菱湘潭钢铁有限公司 Steel for low-surface-hardness spherical tank and production method thereof

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CN102277528A (en) * 2010-06-08 2011-12-14 宝山钢铁股份有限公司 High-strength quenched and tempered steel and its manufacturing method
CN107699659A (en) * 2017-10-19 2018-02-16 攀钢集团攀枝花钢铁研究院有限公司 A kind of denaturation method of Properties of Heavy Rail Steel Sulfide inclusion

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CN101818304A (en) * 2010-03-23 2010-09-01 武汉钢铁(集团)公司 Ultra-large linear energy input welding high-strength steel and production method thereof
CN102277528A (en) * 2010-06-08 2011-12-14 宝山钢铁股份有限公司 High-strength quenched and tempered steel and its manufacturing method
CN107699659A (en) * 2017-10-19 2018-02-16 攀钢集团攀枝花钢铁研究院有限公司 A kind of denaturation method of Properties of Heavy Rail Steel Sulfide inclusion

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CN115786820A (en) * 2022-11-29 2023-03-14 南京钢铁股份有限公司 Manufacturing method of P690QL2 marine storage tank steel
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CN116574981A (en) * 2023-04-24 2023-08-11 舞阳钢铁有限责任公司 High-quality steel plate for low-temperature oil storage tank and production method thereof
CN117026093A (en) * 2023-09-16 2023-11-10 湖南华菱湘潭钢铁有限公司 Steel for low-surface-hardness spherical tank and production method thereof

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