CN102345059A - High strength low alloy structural normalizing A633GRD steel plate and production method thereof - Google Patents
High strength low alloy structural normalizing A633GRD steel plate and production method thereof Download PDFInfo
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Abstract
The invention discloses a high strength low alloy structural normalizing A633GRD steel plate, which comprises the following chemical constituents in percentage by weight (unit, wt%): C: 0.10-0.18, Si: 0.20-0.40, Mn: 1.30-1.60, P: less than or equal to 0.010, S: less than or equal to 0.005, microalloying element (V plus Nb plus Ti): less than or equal to 0.10, Als: less than or equal to 0.050, and balance Fe and residual elements. Through adopting a series of productive technologies of KR molten iron pretreatment, converter smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling, control cooling, slow-cooling and normalizing, the chemical composition design of low carbon, high manganese and microalloying element, and the LF plus VD technologies to ensure the cleanliness of the steel quality, the sum of levels of various impurities is not more than 3.0; the grain size of the steel reaches 8-9 levels through the control rolling, control cooling plus normalizing treatment; and through effectively carrying out the measures, the high strength low alloy structural normalizing A633GRD steel plate of 40-80mm is successfully produced.
Description
Technical field
The invention belongs to the steel plate production technical field, be specifically related to a kind of High-Strength Low-Alloy structure normalized steel plate A633GRD steel plate and working method thereof.
Background technology
A633GRD is the D level steel in the U.S. mark ASTM A633/A633M-01 standard, and this steel plate low-temperature performance is good, and the notch toughness that is suitable for the environmental requirement steel plate is superior to having other rolled sheet material of similar strength level.General iron and steel enterprise produces this steel plate thickness below 30mm, but this type of steel plate is because technology is limit more than the 30mm, and production seldom can't be met the need of market.
Summary of the invention
To the problems referred to above, the present invention provides a kind of low cost, High-Strength Low-Alloy structure normalized steel plate A633GRD steel plate and working method thereof convenient for production.
A kind of High-Strength Low-Alloy structure normalized steel plate A633GRD steel plate; Comprise following chemical components in mass percent (unit; Wt%): C:0.10～0.18, Si:0.20～0.40, Mn:1.30～1.60, P :≤0.010, S :≤0.005, micro alloying element (V+Nb+Ti) :≤0.10, Als :≤0.050, other is Fe and relict element.
The carbon equivalent of said chemical ingredients≤0.45.
The function analysis of above-mentioned chemical element is following:
C: be most basic strengthening element in the steel, improve intensity, but the welding property that C influence steel with influence toughness, take all factors into consideration, what the content of carbon was controlled as far as possible hangs down.
Si: be the solution strengthening element, favourable to the intensity that improves steel plate.
Mn: be the solution strengthening element, all favourable to intensity and the toughness that improves steel plate.
P: unfavorable to welding, and have certain cold shortness, and in this steel grade, belong to harmful element, that should control is low as far as possible.
S: be prone to form the MnS type impurity, have certain red brittleness, in this steel grade, belong to harmful element, that should control is low as far as possible.
V, Nb, Ti: in steel, can combine, form fine carbide or carbonitride, can play crystal grain thinning and dispersion-strengthened action, thereby reach the net effect of the obdurability of effective raising steel with C, N.
Al: can play the crystal grain thinning strengthening effect.
The thickness of said High-Strength Low-Alloy structure normalized steel plate A633GRD steel plate is 40-80mm.
For achieving the above object, the working method of said High-Strength Low-Alloy structure normalized steel plate A633GRD steel plate, it comprises the steps:
A, KR hot metal pretreatment: before the molten iron that arrives at a station must be taken off slag with take off the back slag, guarantee liquid level thickness of slag layer≤20mm, molten iron guarantees molten iron S≤0.005% after the KR stirring desulphurization, assurance desulfurization cycle≤21min, desulfurization temperature drop≤20 ℃;
B. converter smelting: tapping C is controlled at 0.03-0.05%, tapping P≤0.012%, and S≤0.010%, point blows number of times and must not avoid slag under the tapping process greater than 2 times;
C.LF refining: guarantee that the white slag hold-time is controlled in the 15min, stop the shoddye phenomenon, carry out the Argon operation, forbid blowing cruelly in strict accordance with the Argon standard;
The d.VD vacuum refinement: VD vacuum tightness must reach below the 67Pa, and the dwell time is necessary >=18min, soft blow 3-5min or do not blow behind the vacuum breaker, and molten steel must not expose;
E. continuous casting: 15 ± 5 ℃ of middle bag superheating temperature, pulling rate: 0.7m/min, specific water: 0.80L/ ㎏; Electricity stirs: 900A, 5Hz, 30s-3-30s; Continuous-casting steel pouring requires the whole process protection casting, unwraps greatly and waters necessary cover protective tube in the 1min of back, and steel pouring process is used the stopper Argon;
F. heating: the holding temperature of process furnace is controlled at 1200 ℃～1220 ℃;
G. rolling: 1050 ℃～1150 ℃ of start rolling temperatures; Adopt TMCP rolling, the 2-3 that cool steel thickness is finished product thickness doubly permeates for guaranteeing distortion; Rolling line speed is pressed≤1.5m/s control; One stage finishing temperature is at 950 ℃～1000 ℃, and the two-stage start rolling temperature is below 920 ℃, and finishing temperature is controlled at 780-860 ℃;
H. control cold: go into ACC after steel plate rolls and cool off fast, go into water temp＞760 ℃, return 600～750 ℃ of red temperature controls, cooling rate is controlled at 1～8 ℃/s, is sent to powerful straightener then and carries out hot straightening;
I. slow cooling: carry out slow cooling after steel plate rolls off the production line, go into burial pit temperature >=200 ℃, the cooling in heap time is not less than 24 hours;
J. normalizing: steel plate normalizing insulation is stablized 880-930 ℃, and soaking time is according to 1.8-2.4min/mm.
Since the present invention through KR hot metal pretreatment, converter smelting, LF refining, VD vacuum refinement, continuous casting, heating, rolling, control is cold, slow cooling, a series of production technique of normalizing; And through reasonably taking the chemical composition design of low-carbon (LC) Gao Meng ﹑ microalloy element; LF+VD technology guarantees the cleanliness factor of steel; Reach each type impurity rank summation and be no more than 3.0; Make the grain fineness number of steel reach 8～9 grades through controlled rolling and controlled cooling+normalizing treatment,, successfully produced the High-Strength Low-Alloy structure normalized steel plate A633GRD steel plate of 40-80mm through the above-mentioned effective enforcement that waits measure.To the whole process of hot metal pretreatment to the steel plate normalizing treatment; Worked out strict process point control standard; And strict the execution, the quality in kind of product has reached standard-required and the performance surplus capacity is bigger, wherein surrenders surplus capacity at 30～60Mpa; The tension surplus capacity is at 40～80Mpa, and the elongation surplus capacity is 3～6%.
Description of drawings
Below in conjunction with accompanying drawing, the present invention is done further elaboration.
Fig. 1 is the metallographic structure figure (100X) after the normalizing treatment of the present invention.
Embodiment
Low cost of the present invention, High-Strength Low-Alloy structure normalized steel plate A633GRD steel plate convenient for production comprise following chemical components in mass percent (unit; Wt%): C:0.10～0.18, Si:0.20～0.40, Mn:1.30～1.60, P :≤0.010, S :≤0.005, micro alloying element (V+Nb+Ti) :≤0.10, Als :≤0.050, other is Fe and relict element.
The working method that the present invention takes comprises: KR hot metal pretreatment, converter smelting, LF refining, VD vacuum refinement, continuous casting, heating, rolling, control is cold, slow cooling, normalizing; In said KR hot metal pretreatment; The molten iron that arrives at a station must be taken off preceding slag and take off the back slag; Guarantee liquid level thickness of slag layer≤20mm, molten iron guarantees molten iron S≤0.005% after the KR stirring desulphurization, assurance desulfurization cycle≤21min, desulfurization temperature drop≤20 ℃; In said converter smelting, control according to the Melting Process for Low Carbon Steel standard, tapping C is controlled at 0.03-0.05%, tapping P≤0.012%, S≤0.010%, point blows number of times and must not avoid slag under the tapping process greater than 2 times; In said LF refining, adopt big quantity of slag technology to carry out slag making operation, guarantee that the white slag hold-time is controlled in the 15min, stop the shoddye phenomenon, carry out the Argon operation in strict accordance with the Argon standard, forbid blowing cruelly; In said VD vacuum refinement, VD vacuum tightness must reach below the 67Pa, and the dwell time is necessary>=18min, soft blow 3-5min or do not blow behind the vacuum breaker, and molten steel must not expose; In said continuous casting, it is good to water the preceding assurance of steel casting machine status of equipment, 15 ± 5 ℃ of middle bag superheating temperature; Pulling rate: 0.7m/min, the specific water: 0.80L/ ㎏, electricity stirs: 900A, 5Hz, 30s-3-30s; Continuous-casting steel pouring requires the whole process protection casting, unwraps greatly and waters necessary cover protective tube in the 1min of back, must guarantee not show of molten steel face in the middle bag casting process; Rationally control stopper Argon amount in the steel pouring process, guarantee that liquid level fluctuation of crystallizer is slight; Pine in said adding, the holding temperature of process furnace is controlled at 1200 ℃～1220 ℃; Said rolling in, the rolling requirement of " high temperature, low speed, depress greatly ", 1050 ℃～1150 ℃ of start rolling temperatures are adhered in strictness; Adopt TMCP rolling, the 2-3 that cool steel thickness is finished product thickness doubly permeates for guaranteeing distortion; Rolling line speed is pressed≤1.5m/s control, and a stage finishing temperature is at 950 ℃～1000 ℃, and the two-stage start rolling temperature is below 920 ℃; Two-stage takes to depress for a short time rolling, and to guarantee original plate shape, finishing temperature is controlled at 780-860 ℃; In said control is cold, go into ACC after steel plate rolls and cool off fast, go into water temp＞760 ℃, return 600～750 ℃ of red temperature controls, cooling rate is controlled at 1～8 ℃/s, is sent to powerful straightener then and carries out hot straightening; In said slow cooling, after rolling off the production line, steel plate carries out slow cooling, go into burial pit temperature>=200 ℃, the cooling in heap time is not less than 24 hours; In said normalizing, steel plate normalizing insulation is stablized 880-930 ℃, and soaking time is according to 1.8-2.4min/mm.
Embodiment 1
Through KR hot metal pretreatment, converter smelting, LF refining, VD vacuum refinement, continuous casting, heating, rolling, control is cold, slow cooling, normalizing process; Acquisition is described in table 1 below the High-Strength Low-Alloy structure normalized steel plate A633GRD steel plate Finished Steel of chemical ingredients, and wherein said High-Strength Low-Alloy structure normalized steel plate A633GRD steel plate mechanical mechanics property is seen like following table 3.
The chemical ingredients of table 1 embodiment 1 steel
Embodiment 2
Through KR hot metal pretreatment, converter smelting, LF refining, VD vacuum refinement, continuous casting, heating, rolling, control is cold, slow cooling, normalizing process; Acquisition is described in table 2 below the High-Strength Low-Alloy structure normalized steel plate A633GRD steel plate Finished Steel of chemical ingredients, and wherein said High-Strength Low-Alloy structure normalized steel plate A633GRD steel plate mechanical mechanics property is seen like following table 3.
The chemical ingredients of table 2 embodiment 2 steel
Operational path of the present invention: KR hot metal pretreatment → converter smelting → LF refining → VD vacuum metling → continuous caster cast → steel billet slow cooling → strand heating → steel billet dephosphorization → TMCP is rolling → controlled chilling → steel plate aligning → stacking slow cooling → just obtain → surface inspection → finishing → flaw detection → service check → salable product warehouse-in.
Steel-making composition: because the demanding ys of this steel plate guarantees that ys, tensile strength and elongation, the ballistic work of steel plate is difficult point and emphasis, in the composition design, must take all factors into consideration, just can reach the unification of intensity and plasticity and toughness.Consider that the ferritic-pearlitic steel is difficult to reach other intensity of 550Mpa level and-40 ℃ impelling strength requirement on intensity; Therefore adopt low-carbon (LC), the high route that adds the composition design of multicomponent microalloyings such as V, Nb, Ti, Mo, B suddenly; Through in the strand operation of rolling to the control of controlled rolling and cooling control technology, thereby the intensity of efficiently solving and plasticity and toughness are taken into account unified problem.Good for guaranteeing the steel plate internal soundness, adopt the Clean Steel smelting technology simultaneously, [P], [S], [N], [H], [O] five big harmful constituent contents in the steel of keeping under strict control.
Chemical Composition: for guaranteeing good welding property and good plasticity and toughness, in composition design internal control scope, adopt low-carbon (LC) control, guaranteeing the high-intensity steel plate plasticity and toughness of taking into account simultaneously of steel plate, low carbon content has guaranteed that the steel plate welding property is excellent; Mn is one of crystal grain thinning element, in order to improve intensity, reduces the steel brittle transition temperature; Improve low-temperature impact toughness, but during the Mn too high levels, unfavorable to toughness and welding property; And cause the Mn segregation easily, flaw detection is had certain influence, so Mn content is controlled at about 1.45%.V, Nb element can suppress the ausforming recrystallize, stop austenite crystal to be grown up, and can also play the effect of precipitation strength simultaneously, and the compound add-on of Nb ﹑ V ﹑ Ti is controlled between the 0.01-0.05.P, S content are controlled in the lower scope, guarantee the clean inclusion-free of steel plate.Satisfy the composition design requirements of A633GRD slab.
Composition and mechanical mechanics property are pressed ASTM A633/A633M-01 and are carried out, and specifically see table 3
Table 3 High-Strength Low-Alloy structure normalized steel plate A633GRD steel plate mechanical mechanics property
This produces 30 batches of A633GRD steel plates altogether as a trial, 10 batches of the thick A633GRD steel plates of 40mm, 10 batches of the thick A633GRD steel plates of 60mm; 10 batches of the thick A633GRD steel plates of 80mm; Wherein: ys is controlled at 345～400 MPa, has on average reached 375MPa, than the rich 50MPa of standard; Tensile strength is controlled at 490～550 MPa, has on average reached 530 MPa, than the rich 80MPa of standard; Elongation is controlled at 21%-26%, on average reaches 24%, than standard rich 3%;-20 ℃ of V-type ballistic works are controlled at 120-260 J, have on average reached 180 J, and performance index have satisfied the development requires of A633GRD steel plate fully.
Outer inspection and flaw detection: the steel plate of being developed is examined outward, shows zero defect, and the percentage of A-class goods 100%, result of detection show the inner zero defect of steel plate, and the percentage of A-class goods 100% has reached desired result.
Metallographic examination: metallographic examination is carried out in the sampling of product thickness 1/4 place, and the result sees Fig. 1.
Table 4 product metallographic examination result
Associative list 4 and Fig. 1 analysis, steel plate inclusion summation roll the back steel plate and are organized as F+P less than 3.0, and grain fineness number reaches the 8.0-9.0 level.
Claims (4)
1. High-Strength Low-Alloy structure normalized steel plate A633GRD steel plate; It is characterized in that: comprise following chemical components in mass percent (unit; Wt%): C:0.10～0.18, Si:0.20～0.40, Mn:1.30～1.60, P :≤0.010, S :≤0.005, micro alloying element (V+Nb+Ti) :≤0.10, Als :≤0.050, other is Fe and relict element.
2. a kind of High-Strength Low-Alloy structure normalized steel plate A633GRD steel plate as claimed in claim 1 is characterized in that: the carbon equivalent of said chemical ingredients≤0.45.
3. a kind of High-Strength Low-Alloy structure normalized steel plate A633GRD steel plate as claimed in claim 1, it is characterized in that: the thickness of said High-Strength Low-Alloy structure normalized steel plate A633GRD steel plate is 40-80mm.
4. the working method of a kind of High-Strength Low-Alloy structure normalized steel plate A633GRD steel plate as claimed in claim 1 is characterized in that: comprise the steps:
A, KR hot metal pretreatment: before the molten iron that arrives at a station must be taken off slag with take off the back slag, guarantee liquid level thickness of slag layer≤20mm, molten iron guarantees molten iron S≤0.005% after the KR stirring desulphurization, assurance desulfurization cycle≤21min, desulfurization temperature drop≤20 ℃;
B. converter smelting: tapping C is controlled at 0.03-0.05%, tapping P≤0.012%, and S≤0.010%, point blows number of times and must not avoid slag under the tapping process greater than 2 times;
C.LF refining: guarantee that the white slag hold-time is controlled in the 15min, stop the shoddye phenomenon, carry out the Argon operation, forbid blowing cruelly in strict accordance with the Argon standard;
The d.VD vacuum refinement: VD vacuum tightness must reach below the 67Pa, and the dwell time is necessary >=18min, soft blow 3-5min or do not blow behind the vacuum breaker, and molten steel must not expose;
E. continuous casting: guarantee that the casting machine status of equipment is good before watering steel; 15 ± 5 ℃ of middle bag superheating temperature, pulling rate: 0.7m/min, specific water: 0.80L/ ㎏; Electricity stirs: 900A, 5Hz, 30s-3-30s; Continuous-casting steel pouring requires the whole process protection casting, unwraps greatly and waters necessary cover protective tube in the 1min of back, and steel pouring process is used the stopper Argon;
F. heating: the holding temperature of process furnace is controlled at 1200 ℃～1220 ℃;
G. rolling: 1050 ℃～1150 ℃ of start rolling temperatures; Adopt TMCP rolling, the 2-3 that cool steel thickness is finished product thickness doubly permeates for guaranteeing distortion; Rolling line speed is pressed≤1.5m/s control; One stage finishing temperature is at 950 ℃～1000 ℃, and the two-stage start rolling temperature is below 920 ℃, and finishing temperature is controlled at 780-860 ℃;
H. control cold: go into ACC after steel plate rolls and cool off fast, go into water temp＞760 ℃, return 600～750 ℃ of red temperature controls, cooling rate is controlled at 1～8 ℃/s, is sent to powerful straightener then and carries out hot straightening;
I. slow cooling: carry out slow cooling after steel plate rolls off the production line, go into burial pit temperature >=200 ℃, the cooling in heap time is not less than 24 hours;
J. normalizing: steel plate normalizing insulation is stablized 880-930 ℃, and soaking time is according to 1.8-2.4min/mm.
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| CN103484761A (en) * | 2013-09-06 | 2014-01-01 | 鞍钢股份有限公司 | Steel plate for tubular pile 40-60mm thick and production method thereof |
| CN103741024A (en) * | 2014-01-21 | 2014-04-23 | 莱芜钢铁集团有限公司 | Low-cost and high-performance steel plate for wind power and production method thereof |
| CN104561785A (en) * | 2014-12-31 | 2015-04-29 | 南阳汉冶特钢有限公司 | High-strength low-alloy structure A633GrD steel plate and production method thereof |
| CN105177416A (en) * | 2015-09-11 | 2015-12-23 | 山东钢铁股份有限公司 | Steel plate of thermal-pressure-resistant container used for furnace shell and manufacturing method of steel plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103484761A (en) * | 2013-09-06 | 2014-01-01 | 鞍钢股份有限公司 | Steel plate for tubular pile 40-60mm thick and production method thereof |
| CN103741024A (en) * | 2014-01-21 | 2014-04-23 | 莱芜钢铁集团有限公司 | Low-cost and high-performance steel plate for wind power and production method thereof |
| CN104561785A (en) * | 2014-12-31 | 2015-04-29 | 南阳汉冶特钢有限公司 | High-strength low-alloy structure A633GrD steel plate and production method thereof |
| CN105177416A (en) * | 2015-09-11 | 2015-12-23 | 山东钢铁股份有限公司 | Steel plate of thermal-pressure-resistant container used for furnace shell and manufacturing method of steel plate |
| CN109943775A (en) * | 2019-03-26 | 2019-06-28 | 舞阳钢铁有限责任公司 | A kind of structure 28MnB steel plate and its production method |
| CN110983187A (en) * | 2019-12-25 | 2020-04-10 | 南阳汉冶特钢有限公司 | Novel high-strength weather-resistant pipeline steel X80 steel plate and production method thereof |
| CN112662943A (en) * | 2020-11-30 | 2021-04-16 | 山东钢铁股份有限公司 | Low-alloy high-strength hot-rolled round steel Q460D and preparation method thereof |
| CN113106334A (en) * | 2021-03-11 | 2021-07-13 | 石家庄钢铁有限责任公司 | Steel for cycloidal gear of RV reducer and preparation method thereof |
| CN114150220A (en) * | 2021-11-26 | 2022-03-08 | 湖南华菱湘潭钢铁有限公司 | Production method of low-carbon equivalent normalizing container steel plate |
| CN115216711A (en) * | 2022-07-28 | 2022-10-21 | 湖南华菱湘潭钢铁有限公司 | Thick steel plate for normalizing Q345-grade pressure vessel and production method thereof |
| CN116145025A (en) * | 2022-11-28 | 2023-05-23 | 重庆钢铁股份有限公司 | Normalizing E steel plate for ship and manufacturing method thereof |
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Application publication date: 20120208 |