CN113249637A - Manufacturing method of 50-80 mm-thick medium-plate high-strength steel Q390D - Google Patents
Manufacturing method of 50-80 mm-thick medium-plate high-strength steel Q390D Download PDFInfo
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- CN113249637A CN113249637A CN202110536504.5A CN202110536504A CN113249637A CN 113249637 A CN113249637 A CN 113249637A CN 202110536504 A CN202110536504 A CN 202110536504A CN 113249637 A CN113249637 A CN 113249637A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 26
- 239000010959 steel Substances 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000005096 rolling process Methods 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 229910052742 iron Inorganic materials 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000005266 casting Methods 0.000 claims abstract description 8
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 8
- 230000023556 desulfurization Effects 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 238000005204 segregation Methods 0.000 claims abstract description 6
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 238000005516 engineering process Methods 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000007689 inspection Methods 0.000 claims abstract description 5
- 238000007670 refining Methods 0.000 claims abstract description 4
- 238000005070 sampling Methods 0.000 claims abstract description 4
- 238000007711 solidification Methods 0.000 claims abstract description 4
- 230000008023 solidification Effects 0.000 claims abstract description 4
- 239000002436 steel type Substances 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 241000124033 Salix Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a manufacturing method of middle-plate high-strength steel Q390D with the thickness of 50-80mm, which comprises the following chemical components in percentage by weight: 0.14-0.17% of C and 1.30-1.40% of Mn; 0.15 to 0.25 percent of Si, less than or equal to 0.010 percent of S, less than or equal to 0.018 percent of P, 0.020 to 0.04 percent of Als, 0.035 to 0.045 percent of Nb, and the balance of Fe and inevitable impurities; the thickness range of the plate is 50-80 mm; production flow of Q390D: KR molten iron pre-desulfurization treatment → 120t converter → LF + RH refining → 250mm slab → heating → controlled rolling → stacking cold → flaw detection → finishing → sampling inspection → identification → warehousing; in the production flow, the molten iron entering the furnace is subjected to KR molten iron pre-desulfurization treatment, and S is less than or equal to 0.003 percent; the final stage [ O ] of the converter smelting is less than or equal to 500ppm, and the heating process is carried out at the heating temperature of 1180-1220 ℃; rolling, wherein the initial rolling temperature of finish rolling is less than or equal to 880 ℃, and the final rolling temperature is 740-770 ℃; the heap cooling time is more than or equal to 24 hours; the slab is subjected to dynamic soft reduction in the whole process in the casting process by using a solidification tail end soft reduction technology, the reduction is 8mm, the superheat degree is low by 5-20 ℃, the casting is carried out in a stable state, the pulling speed fluctuation is less than or equal to 0.1M/min, and the low-power segregation result of the slab is within the German Mannesmann standard M2.5.
Description
Technical Field
The invention relates to a method for manufacturing high-strength steel Q390D of a middle plate with the thickness of 50-80mm, belonging to the technical field of ferrous metallurgy and metal material processing and forming.
Background
In recent years, steel structure buildings have been developed more rapidly than traditional buildings. The statistical data of the Chinese iron and steel society show that the use proportion of the Q345 steel in the steel structure shows a descending trend, and the use amount of the Q390 steel is gradually increased. Q390D is a steel plate for ships, boilers, pressure vessels, oil storage tanks, bridges, power plants, hoisting and transportation machinery and other high-load welded structural members. Due to the thickness specification of 50-80mmQ390D, the production is difficult to ensure the impact toughness and stability at the temperature of-20 ℃.
According to published articles of key word inquiry of Chinese knowledge network Q390D, there are development and trial production of Q390D steel (willow steel technology, No. 2 of 2001) and development of low-alloy high-strength structural steel Q390D (Shandong metallurgy, No. S1 of 2004), but the thickness of Q390D of related development is below 30 mm; the patent information comprehensive service platform 'Q390D' keyword inquiry publication patent comprises: the use thickness of Q390D related to low-cost and high-weldability Q390 medium-thick plate and short-process production method thereof (application publication No. CN 107287518A) is within 50 mm; the invention extends the thickness range of Q390D which is stably produced and supplied to the range of 50-80mm, and the updating of steel products are accelerated, thereby realizing the sustainable development of steel enterprises.
Disclosure of Invention
The invention aims to provide a method for manufacturing high-strength steel Q390D of a middle plate with the thickness of 50-80mm, expand the product variety and realize stable production.
In order to solve the technical problems, the invention adopts the technical scheme that: a manufacturing method of middle-plate high-strength steel Q390D with the thickness of 50-80mm comprises the following chemical components in percentage by weight: 0.14-0.17% of C and 1.30-1.40% of Mn; 0.15 to 0.25 percent of Si, less than or equal to 0.010 percent of S, less than or equal to 0.018 percent of P, 0.020 to 0.04 percent of Als, 0.035 to 0.045 percent of Nb, and the balance of Fe and inevitable impurities; the thickness range of the plate is 50-80 mm; production flow of Q390D: KR molten iron pre-desulfurization treatment → 120t converter → LF + RH refining → 250mm slab → heating → controlled rolling → stacking cold → flaw detection → finishing → sampling inspection → identification → warehousing; in the production flow, the molten iron entering the furnace is subjected to KR molten iron pre-desulfurization treatment, and S is less than or equal to 0.003 percent; the final stage [ O ] of the converter smelting is less than or equal to 500ppm, and the heating process is carried out at the heating temperature of 1180-1220 ℃; rolling, wherein the initial rolling temperature of finish rolling is less than or equal to 880 ℃, and the final rolling temperature is 740-770 ℃; the heap cooling time is more than or equal to 24 hours; the slab is subjected to dynamic soft reduction in the whole process in the casting process by using a solidification tail end soft reduction technology, the reduction is 8mm, the superheat degree is low by 5-20 ℃, the casting is carried out in a stable state, the pulling speed fluctuation is less than or equal to 0.1M/min, and the low-power segregation result of the slab is within the German Mannesmann standard M2.5.
The design idea of the invention is as follows: the method adopts the C-Mn-Nb design, reduces the addition of C, Mn, controls the carbon equivalent to be less than or equal to 0.36%, controls the center segregation level in the plate blank by adopting a dynamic light press and low superheat degree steady state pouring mode, and has high flaw detection qualification rate of the 50-80mm Q390D steel plate and high production efficiency.
Adopt above-mentioned technical scheme's beneficial effect to lie in: 1. the invention adopts the C-Mn-Nb design, reduces the addition of C, Mn, controls the carbon equivalent to be less than or equal to 0.34 percent and is easy to weld; meanwhile, Nb can improve the recrystallization temperature and inhibit the growth of crystal grains, and the Nb is adopted for rolling two phase regions of a recrystallization region and a non-recrystallization region so as to increase the effects of deformation zone and deformation induced precipitation and refine the crystal strengthening toughness; 2. the method controls the internal center segregation level of the plate blank in a dynamic soft reduction and low superheat degree steady-state pouring mode, and the flaw detection qualification rate of the 50-80mmQ390D steel plate is high; 3. by adopting the rolling process of controlled rolling, the straightening temperature of the straightening machine is low in load, and the finishing pass rate of the steel plate is high. 4. The steel plate has short cold piling time and high production efficiency;
the low-cost Q390 medium-thick plate has the inspection standard GB/T1591-2018 low-alloy high-strength structural steel, wherein the performance requirements of a steel plate with the thickness of 50-80mm are shown in Table 1.
Table 1: national standard requirement for steel plate with thickness of 50-80mm
| Thickness of | Yield strength/MPa | Tensile strength/MPa | Elongation/% (longitudinal) | Impact work at-20 ℃ J |
| 50~63mm | ≥360 | 490~650 | ≥20 | 34 |
| 63~80mm | ≥340 | 490~650 | ≥20 | 34 |
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
A manufacturing method of middle-plate high-strength steel Q390D with the thickness of 50-80mm comprises the following chemical components in percentage by weight: 0.14-0.17% of C and 1.30-1.40% of Mn; 0.15 to 0.25 percent of Si, less than or equal to 0.010 percent of S, less than or equal to 0.018 percent of P, 0.020 to 0.04 percent of Als, 0.035 to 0.045 percent of Nb, and the balance of Fe and inevitable impurities; the thickness range of the plate is 50-80 mm; production flow of Q390D: KR molten iron pre-desulfurization treatment → 120t converter → LF + RH refining → 250mm slab → heating → controlled rolling → stacking cold → flaw detection → finishing → sampling inspection → identification → warehousing; in the production flow, the molten iron entering the furnace is subjected to KR molten iron pre-desulfurization treatment, and S is less than or equal to 0.003 percent; the final stage [ O ] of the converter smelting is less than or equal to 500ppm, and the heating process is carried out at the heating temperature of 1180-1220 ℃; rolling, wherein the initial rolling temperature of finish rolling is less than or equal to 880 ℃, and the final rolling temperature is 740-770 ℃; the heap cooling time is more than or equal to 24 hours; the slab is subjected to dynamic soft reduction in the whole process in the casting process by using a solidification tail end soft reduction technology, the reduction is 8mm, the superheat degree is low by 5-20 ℃, the casting is carried out in a stable state, the pulling speed fluctuation is less than or equal to 0.1M/min, and the low-power segregation result of the slab is within the German Mannesmann standard M2.5.
Example (b): the manufacturing method of the 50-80mm medium plate high-strength steel Q390D adopts the following specific process.
(1) The middle-thick plate of the 50-80mm middle-plate high-strength steel Q390D is prepared by smelting, continuous casting, heating, rolling and cooling; a heating step, wherein the heating temperature is 1170-1210 ℃. Rolling, wherein the initial rolling temperature of finish rolling is less than or equal to 880 ℃, and the final rolling temperature is 740-770 ℃; the specific process parameters of each process are shown in Table 2.
Table 2: process parameters of the examples
（2）
(3) The chemical compositions of the Q390 medium plate obtained in each example are shown in Table 3, and the thickness and mechanical properties of the plate are shown in Table 4.
TABLE 3 chemical composition of the medium plate material (wt%) obtained in each example
| Examples | C | Si | Mn | Nb | S | P | Als |
| 1 | 0.14 | 0.18 | 1.30 | 0.035 | 0.005 | 0.018 | 0.020 |
| 2 | 0.16 | 0.15 | 1.38 | 0.045 | 0.007 | 0.012 | 0.022 |
| 3 | 0.17 | 0.20 | 1.40 | 0.038 | 0.010 | 0.013 | 0.025 |
In table 3, the balance of the chemical composition is Fe and inevitable impurities.
Table 4: thickness and Properties of the Thick plates in the examples
| Examples | Thickness/mm | Yield strength/MPa | Tensile strength/MPa | Elongation/percent | -20 ℃ impact work mean/J | Cold bend test |
| 1 | 60 | 420 | 551 | 25.3 | 170 | Qualified |
| 2 | 70 | 415 | 547 | 24.6 | 153 | Qualified |
| 3 | 80 | 409 | 532 | 23.4 | 136 | Qualified |
Claims (1)
1. A manufacturing method of middle-plate high-strength steel Q390D with the thickness of 50-80mm is characterized in that the steel type comprises the following chemical components in percentage by weight: 0.14-0.17% of C and 1.30-1.40% of Mn; 0.15 to 0.25 percent of Si, less than or equal to 0.010 percent of S, less than or equal to 0.018 percent of P, 0.020 to 0.04 percent of Als, 0.035 to 0.045 percent of Nb, and the balance of Fe and inevitable impurities; the thickness range of the plate is 50-80 mm; production flow of Q390D: KR molten iron pre-desulfurization treatment → 120t converter → LF + RH refining → 250mm slab → heating → controlled rolling → stacking cold → flaw detection → finishing → sampling inspection → identification → warehousing; in the production flow, the molten iron entering the furnace is subjected to KR molten iron pre-desulfurization treatment, and S is less than or equal to 0.003 percent; the final stage [ O ] of the converter smelting is less than or equal to 500ppm, and the heating process is carried out at the heating temperature of 1180-1220 ℃; rolling, wherein the initial rolling temperature of finish rolling is less than or equal to 880 ℃, and the final rolling temperature is 740-770 ℃; the heap cooling time is more than or equal to 24 hours; the slab is subjected to dynamic soft reduction in the whole process in the casting process by using a solidification tail end soft reduction technology, the reduction is 8mm, the superheat degree is low by 5-20 ℃, the casting is carried out in a stable state, the pulling speed fluctuation is less than or equal to 0.1M/min, and the low-power segregation result of the slab is within the German Mannesmann standard M2.5.
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| CN202110536504.5A CN113249637A (en) | 2021-05-17 | 2021-05-17 | Manufacturing method of 50-80 mm-thick medium-plate high-strength steel Q390D |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113718161A (en) * | 2021-09-01 | 2021-11-30 | 新疆八一钢铁股份有限公司 | Control method for preventing 20Ni2MoA gear steel from processing cracking |
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