CN115747640A - Q500qFNH steel produced by TMCP process and production method thereof - Google Patents
Q500qFNH steel produced by TMCP process and production method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of wide and thick plate metallurgy, and particularly relates to Q500qFNH steel produced by a TMCP (thermal mechanical control processing) process and a production method thereof. In the component design of the steel plate, the low C design is adopted, so that the carbon equivalent and the welding crack sensitivity index are reduced; by controlling the reasonable Si content, the balance of weather resistance coefficient, pcm, non-recrystallization temperature and impact property is achieved; by introducing the Cr alloy with relatively low cost, the overall alloy cost is reduced on the basis of ensuring the performance; in the production process, the Q500qFNH steel plate is finally ensured to be reasonable in matrix structure combination by accurately controlling each temperature point of finished plates with different thicknesses in the finish rolling process, has higher strength, excellent low-temperature impact toughness, good welding performance and good atmospheric corrosion resistance, and meets the requirements of use and manufacture of large-scale bridge construction.
Description
Technical Field
The invention belongs to the technical field of wide and thick plate metallurgy, and particularly relates to Q500qFNH steel produced by a TMCP (thermal mechanical control processing) process and a production method thereof.
Background
With the rapid development of the economy of China, the construction of roads and railway bridges reaches a new height. At present, bridge construction is developed towards the directions of high speed, heavy load, large span and full welding, which also puts higher quality requirements on bridge structural steel.
The bridge steel plate not only needs to have high strength performance to achieve the purpose of light weight, but also needs to have excellent low-temperature impact toughness, easy weldability and atmospheric corrosion resistance. At present, the high-strength weather-resistant bridge steel in China is applied less, and the main problems of the high-strength weather-resistant bridge steel are as follows: along with the increase of the strength of the bridge steel, the impact toughness of the steel plate is obviously reduced, and the safety in extreme cold weather is difficult to ensure; and secondly, the high-strength weather resistance performance causes more expensive alloy elements such as V, ni and Mo to be added into the steel plate, so that the cost is increased, the carbon equivalent and the welding crack sensitivity index are increased, and the welding performance is difficult to ensure.
Chinese patent CN 106222560A proposes a crack-arresting extra-thick high-performance weather-resistant bridge steel Q500qFNH steel plate and a production method thereof, and the chemical components (wt%) of the steel plate are as follows: c:0.07 to 0.12, mn: 1.30-1.60, P: not more than 0.012, S: less than or equal to 0.005, ni:0.40 to 0.8%, cu:0.3 to 0.5; cr:0.2 to 0.35; mo:0.15 to 0.40; nb:0.015 to 0.060, als: 0.015-0.045, weather resistance index I is more than or equal to 6.0, and the others are Fe and residual elements. However, the scheme has extremely high contents of C, mn, ni, cu and Mo, and the steel plate is produced by die casting, so that the cost of the steel plate is extremely high, and the steel plate is difficult to widely popularize and use; and secondly, the carbon equivalent and the welding crack sensitivity index of the steel plate are also extremely high due to the higher alloy addition amount, so that the steel plate has no good processing and welding performance and has small use significance.
In view of the above, the development of the Q500qFNH steel plate which is low in cost and easy to weld and the production method thereof have great significance for bridge construction in China.
Disclosure of Invention
The invention aims to provide Q500qFNH steel produced by a TMCP process, the steel plate has the advantages of reasonable combination of all chemical components, low cost, low carbon equivalent and welding crack sensitivity index and excellent low-temperature impact toughness, the production method is convenient for production organization in the technical field of wide and thick plate metallurgy, and the steel plate obtained according to the scheme can meet the actual production, processing and use requirements.
The invention also aims to provide a production method for producing Q500qFNH steel by the TMCP process.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a low-cost easy-welding Q500qFNH steel plate produced by a TMCP process has a thickness of 10-30 mm and comprises the following chemical components in percentage by mass (unit, wt%): 0.05-0.09C, 0.10-0.25 Si, 1.30-1.50 Mn, 0.008-0.018P, less than or equal to 0.003S, 0.020-0.035A) S, 0.040-0.060 Nb, 0.30-0.35 Ni, 0.45-0.60 Cr, 0.25-0.30 Cu, less than or equal to 0.02 Ti and less than or equal to 0.0005B, the balance being Fe and residual elements;
weather resistance coefficient I =26.01Cu +3.88Ni +1.2Ct +1.49Si +17.28P-7.29CuNi-9.10NiP-33.39Cu 2 Not less than 6.0, carbon equivalent CEV = C + Mn/6+ (Cr + Mo + V)/5 + (Ni + Cu)/15 not more than 0.48%, and weld crack sensitivity index: pcm = C + Si/30+ Mn/20+ Cu/20+ Ni/60+ Cr/20+ Mo/15+ V/10+5B less than or equal to 0.22%, the total compression ratio of the steel plate is more than or equal to 10, the yield strength is more than or equal to 500MPa, the tensile strength is more than or equal to 630MPa, the elongation is more than or equal to 18%, and the longitudinal KV2 impact energy at-60 ℃ is more than or equal to 200J.
A production method for producing Q500qFNH steel by a TMCP process comprises the following steps: smelting, casting, heating, rolling and cooling control and stacking cooling;
the TMCP controlled rolling and controlled cooling process comprises the following steps: the initial rolling temperature of rough rolling is more than or equal to 1000 ℃, the pass reduction is more than or equal to 35mm except the pass of steel rolling and the last pass of rough rolling, the accumulated reduction rate is more than or equal to 70%, the thickness of air-dried steel is more than or equal to 2.5, the thickness of finished steel is more than or equal to 65%, and the corresponding initial rolling temperature, final rolling temperature, water inlet temperature and red returning temperature of finish rolling need to be controlled according to the thickness of the finished steel plate, and the specific table is as follows:
| thickness/mm of steel plate | The rolling start temperature/DEG C of finish rolling | Final Rolling temperature/. Degree.C | Temperature in water/. Degree.C | Temperature of re-reddening/. Degree.C |
| ≥8～10 | 980N 1020 | 790～830 | 720～730 | 590±10 |
| ≥11～15 | 910～940 | 780～820 | 725～735 | 560±10 |
| ≥16～22 | 820～860 | 780～820 | 730～740 | 550±10 |
| ≥22～30 | 790～830 | 780～810 | 740～750 | 530±10 |
The stacking cooling process requires that the steel plate is straightened and then placed into a slow cooling pit for stacking cooling, the stacking cooling temperature is more than or equal to 150-250 ℃, and the stacking cooling time is more than or equal to 24 hours.
The design concept of the components of the invention is to adopt the low-C component design to reduce CEV and Pcm and improve the impact toughness of the steel plate. However, in order to ensure the strength of the steel sheet, a relatively inexpensive Cr alloy is used instead of the Mo and V alloys. With the increase of the Cr content, the granular bainite in the steel plate structure is increased, and the strength is greatly improved; and secondly, cr has good hardenability and corrosion resistance, can improve the weather resistance coefficient, has the same effect as the noble Ni and Cu alloys, and further can reduce the use amount of Ni and Cu.
Meanwhile, the content of Si is required to be controlled, so that the aims of balancing weather resistance coefficient, pcm, non-recrystallization temperature and impact property are fulfilled. The higher the Si content, the higher the weather resistance, the better the corrosion resistance of the steel sheet, but the higher the Pcm of the steel sheet, and the worse the weldability. Secondly, the non-recrystallization temperature decreases with increasing Si content, which is disadvantageous for controlling the rolling. Further, as Si increases, the austenite grain size increases, and the structure is transformed from lath ferrite (LB) + Granular Bainite (GB) to granular bainite + Lath Bainite (LB) + martensite (M), eventually resulting in deterioration of impact toughness. The invention finds that the Si content is controlled to be 0.10-0.25, and the comprehensive performance of the weathering steel is the most excellent.
On the controlled rolling and controlled cooling (TMCP) process, the steel plate can be ensured to obtain fine grains and uniform tissues through a large compression ratio and large accumulated reduction rates of rough rolling and finish rolling; and secondly, by controlling the finish rolling start rolling temperature, the generation of a coarse bainite structure after the steel plate is finally cooled is avoided. In addition, by controlling the final cooling temperature, a certain proportion of Granular Bainite (GB) and Lath Bainite (LB) is obtained, and the toughness matching property of the steel plate is ensured.
The Q500qFNH steel produced by the TMCP process and the production method thereof have the beneficial effects that:
the Q500qFNH steel plate provided by the application has the advantages that the combination of all chemical components and matrix tissues is reasonable, the steel plate can have higher strength and excellent low-temperature impact toughness, the welding performance and the atmospheric corrosion resistance are good, and the use and manufacture of large-scale bridge construction are met.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The embodiment provides a Q500qFNH steel plate with the thickness of 10mm, which comprises the following chemical components in percentage by mass: 0.06 of C, 0.16 of Si, 1.40 of Mn1, 0.015 of P, 0.002 of S, 0.030 of Als0, 0.045 of Nb0, 0.32 of Ni0, 0.48 of Cr0, 0.26 of Cu0, 0.016 of Ti0, 0.0004 of B, and the balance of Fe and residual elements.
Weather resistance coefficient I =6.17, carbon equivalent CEV =0.44%, and weld crack sensitivity index Pcm =0.19.
A steel billet with the thickness of 240mm is adopted, the thickness of a finished steel plate is 10mm, and the compression ratio is 240/10=24.
The production method comprises the following steps:
smelting: after the molten iron is stirred and desulfurized by KR, the S content is 0.008 percent. The converter tapping C content is 0.03 percent, and the P content is 0.012 percent. The addition amount of the deoxidizer aluminum block is 120Kg, and the addition amount of the tapping lime is 300Kg. The thickness of the converter slag is 15mm, argon is blown by an argon station for 5min, and the flow is controlled at 300 NL/min. 1300Kg of LF refined lime is added, 350m of aluminum wire is added, and the white slag is kept for 25min. VD, the vacuum degree is 67Pa, the vacuum pressure maintaining time is 20min, and the [ H ] content is determined to be 0.8PPm.
Casting: the whole process adopts protective casting, the liquidus temperature of the molten steel is 1518 ℃, and the temperature of the tundish is controlled within the range of 1530-1535 ℃.
Heating: the first heating temperature of the billet steel is 960 ℃, the second heating temperature is 1210 ℃, the temperature of the soaking section is 1200 ℃, and the total heating time is 270 minutes.
Rolling and cooling control: the accumulated rough rolling reduction rate is 83.33 percent, and the steel airing thickness is 40mm; the initial rolling temperature of finish rolling is 1000 ℃, the final rolling temperature is 820 ℃, the cumulative reduction rate is 75%, the water inlet temperature is 730 ℃, and the red returning temperature is 585 ℃.
And (3) cooling in a stacking manner: the steel plate is cooled in pile at 165 deg.c for 25 hr.
Example 2
The embodiment provides a Q500qFNH steel plate with the thickness of 20mm, which comprises the following chemical components in percentage by mass: c0.07, si0.20, mn1.46, P0.014, S0.002, als0.028, nb0.055, ni0.33, cr0.52, cu0.27, ti0.013, B0.0004, and the balance Fe and residual elements.
Weather resistance coefficient I =6.34, carbon equivalent CEV =0.46, and weld crack sensitivity index Pcm =0.20.
A billet with the thickness of 300mm is adopted, the thickness of a finished steel plate is 20mm, and the compression ratio is 300/20=15.
The difference from example 1 is that: the content of P in converter tapping is 0.010 percent, and the thickness of converter slag is 16mm. VD, vacuum pressure maintaining time 23min, and determining [ H ] content to be 0.7PPm. The billet heating time is 330 minutes. The accumulated rough rolling reduction rate is 76.67%, the steel airing thickness is 70mm, the finish rolling starting temperature is 840 ℃, the finish rolling temperature is 790 ℃, the accumulated finish rolling reduction rate is 71.43%, the water inlet temperature is 735 ℃, and the red returning temperature is 545 ℃.
Example 3
The embodiment provides a Q500qFNH steel plate with the thickness of 30mm, which comprises the following chemical components in percentage by mass: c0.07, si0.20, mn1.48, P0.016, S0.002, als0.032, nb0.057, ni0.34, cr0.56, cu0.26, ti0.012, B0.0004, and the balance of Fe and residual elements.
Weather resistance coefficient I =6.38, carbon equivalent CEV =0.47, and weld crack sensitivity index Pcm =0.21.
A billet with the thickness of 300mm is adopted, the thickness of a finished steel plate is 30mm, and the compression ratio is 300/30=10.
The differences from the embodiments 1 and 2 are that: the P content of converter tapping is 0.013%, and the converter slag discharging thickness is 18mm. VD, vacuum pressure maintaining time 21min, and determining [ H ] content 0.7PPm. The accumulated rough rolling reduction rate is 70%, the airing thickness is 90mm, the finish rolling starting temperature is 790 ℃, the finish rolling temperature is 780 ℃, the accumulated reduction rate is 66.67%, the water entry temperature is 745 ℃, and the re-reddening temperature is 530 ℃.
Performance of Experimental examples
The Q500qFNH plate obtained in examples 1 to 3 was used as a sample to be tested, the chemical composition of the steel plate, the sampling position of the mechanical property test piece and the preparation of the sample were measured according to the GB/T2975 standard, the low-temperature impact toughness test was measured according to the GB/T229 standard, the tensile property test was measured according to the GB/T228 standard, and the bending property test was measured according to the GB/T232 standard. The results of the measurements are shown in Table 1 below.
TABLE 1 test results
As can be seen from Table 1, Q500qFNH steel sheets of various thicknesses, which are provided in examples 1 to 3 of the present application, have good strength properties, and low temperature impact properties. According to the CEV and Pcm values, the steel plate has good welding performance. According to the weather resistance coefficient I, the steel plate has good atmospheric corrosion resistance. The indexes all meet the requirements of bridge construction.
In addition, the Q500qFNH steel plate is subjected to surface and internal flaw detection, and the qualification rate reaches 100.00 percent.
In summary, the steel for the Q500qFNH steel plate has reasonable combination of chemical components, production process and internal structure, and can have better mechanical property and welding property. The production method meets the organizational production of the metallurgical industry, can achieve the quality of the Q500qFNH steel plate, and improves the service performance.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The Q500qFNH steel produced by the TMCP process is characterized by comprising the following chemical components in percentage by mass (unit, wt%): 0.05-0.09C, 0.10-0.25 Si, 1.30-1.50 Mn, 0.008-0.018P, less than or equal to 0.003S, 0.020-0.035 Als, 0.040-0.060 Nb, 0.30-0.35 Ni, 0.45-0.60 Cr, 0.25-0.30 Cu, less than or equal to 0.02 Ti and less than or equal to 0.0005B, the balance being Fe and residual elements;
the thickness of the steel plate is 10-30 mm, the weather resistance coefficient I is more than or equal to 6.0, the carbon equivalent CEV is less than or equal to 0.48, the welding crack sensitivity index Pcm is less than or equal to 0.22, the total compression ratio of the steel plate is more than or equal to 10, the yield strength is more than or equal to 500MPa, the tensile strength is more than or equal to 630MPa, the elongation is more than or equal to 18 percent, and the longitudinal KV2 impact energy at the temperature of minus 60 ℃ is more than or equal to 200J.
2. A method of producing Q500 qnfh steel by a TMCP process according to claim 1, comprising the steps of: smelting, casting, heating, controlled rolling and controlled cooling and stacking cooling, and is characterized in that:
the TMCP controlled rolling and controlled cooling process comprises the following steps: the initial rolling temperature of rough rolling is more than or equal to 1000 ℃, the rolling pass and the final rolling pass are removed, the pass rolling reduction is more than or equal to 35mm, the accumulated rolling reduction is more than or equal to 70%, the airing steel thickness is more than or equal to 2.5, the finished steel thickness is more than or equal to 65%, and the corresponding initial rolling temperature, the final rolling temperature, the water inlet temperature and the red returning temperature of finish rolling need to be controlled according to the thickness of the finished steel plate, wherein the specific table is as follows:
Wherein the stacking cooling process requires that the steel plate is straightened and then placed into a slow cooling pit for stacking cooling, the stacking cooling temperature is more than or equal to 150-250 ℃, and the stacking cooling time is more than or equal to 24 hours.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105779883A (en) * | 2016-05-06 | 2016-07-20 | 舞阳钢铁有限责任公司 | 485MPa level TMCP+ tempering weather-proof bridge steel plate and production method |
| CN107557668A (en) * | 2017-09-29 | 2018-01-09 | 舞阳钢铁有限责任公司 | TMCP types surrender 345MPa level Weather-resistance bridge steel plates and production method |
| US20210395849A1 (en) * | 2020-06-19 | 2021-12-23 | Central Iron & Steel Research Institute | High-Strenth Low-Carbon Bainitic Fire-Resistant Steel And Preparation Method Thereof |
| CN114150209A (en) * | 2021-11-16 | 2022-03-08 | 山东钢铁集团日照有限公司 | High-performance bridge steel with yield strength not less than 550MPa and preparation method and application thereof |
| CN114959460A (en) * | 2022-05-06 | 2022-08-30 | 鞍钢股份有限公司 | Low-yield-ratio easy-to-weld weather-resistant bridge steel and manufacturing method thereof |
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2022
- 2022-10-28 CN CN202211335486.5A patent/CN115747640A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105779883A (en) * | 2016-05-06 | 2016-07-20 | 舞阳钢铁有限责任公司 | 485MPa level TMCP+ tempering weather-proof bridge steel plate and production method |
| CN107557668A (en) * | 2017-09-29 | 2018-01-09 | 舞阳钢铁有限责任公司 | TMCP types surrender 345MPa level Weather-resistance bridge steel plates and production method |
| US20210395849A1 (en) * | 2020-06-19 | 2021-12-23 | Central Iron & Steel Research Institute | High-Strenth Low-Carbon Bainitic Fire-Resistant Steel And Preparation Method Thereof |
| CN114150209A (en) * | 2021-11-16 | 2022-03-08 | 山东钢铁集团日照有限公司 | High-performance bridge steel with yield strength not less than 550MPa and preparation method and application thereof |
| CN114959460A (en) * | 2022-05-06 | 2022-08-30 | 鞍钢股份有限公司 | Low-yield-ratio easy-to-weld weather-resistant bridge steel and manufacturing method thereof |
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