CN102094148B - Q460D steel for low-alloy high-strength structure of below 50mm and production method thereof - Google Patents
Q460D steel for low-alloy high-strength structure of below 50mm and production method thereof Download PDFInfo
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Abstract
The invention discloses Q460D steel for a low-alloy high-strength structure of below 50mm and a production method thereof. The steel comprises the following chemical components in percentage by weight: 0.14 to 0.17 percent of C, 0.25 to 0.40 percent of Si, 1.45 to 1.55 percent of Mn, less than or equal to 0.018 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.20 percent of micro-alloying elements (V, Nb and Ti), less than or equal to 0.035 percent of Als and the balance of Fe and residual elements, wherein carbon equivalent (Ceq) is controlled to be less than 0.43 percent; carbon and manganese are mainly used for improving the strength of a steel plate; the combined addition amount of the Nb, V and Ti is controlled to be between 0.085 and 0.11 percent, and the Nb, V and Ti are mainly used for refining crystal grains and improving the plasticity and toughness of the steel plate; and yield strength is controlled to be between 470 and 490MPa, tensile strength is controlled to be between 570 and 700MPa, elongation is controlled to be between 17 and 26 percent, impact work at the temperature of 0 DEG C is controlled to be between 140 and 160J, and the strength achieves the performance level of the Q460D steel.
Description
Technical field
The present invention relates to the steel production technical field, be specifically related to a kind of 50mm following low-alloy high-strength structural steel Q460D and production method thereof.
Background technology
Low-alloy high-strength structural steel Q460D is on the basis of common low-alloy Series Steel, in order to guarantee the mechanical property of steel plate, in steel, add Nb, V, Ti etc. and carry out microalloying, mainly be for crystal grain thinning, improved the toughness of steel plate, lower carbon equivalent has fully guaranteed the welding property of steel plate.Be mainly used in various heavy construction structures, coal machine profession and desired strength are high, load is large lightweight construction etc.In recent years, the application of Hi-Stren steel is more extensive, and domestic had a large amount of research to this, and low-cost and high-quality has become the core of market competition, how to carry out the performance of microalloying assurance steel plate in the production process, cancel follow-up thermal treatment process to reduce production costs.Under the prerequisite that guarantees steel mechanics performance, accomplish to reduce cost, optimization technological process, company has dropped into a large amount of manpower studies TMCP explained hereafter and has made low-alloy high-tensile structural steel, the thermal treatment process of cancellation steel plate.Rolling each time steel plate is carried out the sampling of piece piece carry out the mechanical property detection, grope rolling technology from follow-up results of property, and each block plate carried out composition, technique, tissue, performance analysis, expectation formed a cover from Composition Design, steel billet smelt, the systemic production technique of steel plate rolling.Technique can guarantee the requirement of final performance, has reduced again cost, for company has increased huge economic benefit.
Summary of the invention
Therefore, purpose of the present invention mainly is for a kind of requirement that can guarantee final performance is provided, and has reduced again cost, guaranteed cost, guarantor flaw detection, has increased 50mm following low-alloy high-strength structural steel Q460D and the production method thereof of huge economic benefit for company.
The following low-alloy high-strength structural steel of a kind of 50mm Q460D, chemical ingredients (the unit that comprises following mass percent, wt%): C:0.14~0.17, Si:0.25~0.40, Mn:1.45~1.55, P :≤0.018, S :≤0.005, micro alloying element (V+Nb+Ti) :≤0.20, Als :≤0.035, other is Fe and relict element.
The following low-alloy high-strength structural steel of above-mentioned 50mm Q460D, its carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] :≤0.42.
The Main Function of above-mentioned chemical element interalloy element is analyzed as follows: C: be most basic strengthening element in the steel, improve intensity, but C affects the welding property of steel and affects toughness.Consider, the content of carbon is hanging down of control as far as possible.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.V, Nb, Ti: in steel, can be combined with C, N, form fine carbide or carbonitride, can play crystal grain thinning and dispersion-strengthened action, thereby reach the net effect of the obdurability of Effective Raise steel.Al: can play the grain refining intensificatiom effect.
The production method of the following low-alloy high-strength structural steel of a kind of 50mm Q460D may further comprise the steps:
A. KR hot metal pretreatment: the molten iron that arrives at a station must carry out desulfurization, guarantees desulfurized molten iron S≤0.005%, and temperature is greater than 1280 ℃;
B. converter smelting: enter stove molten iron Si content below 0.60%, molten iron temperature 〉=1270 ℃, steel scrap strictly adopts the high-quality scrap stock, process rifle position is controlled between the 1.0-1.6m, adding model in strict accordance with lime adds, guarantee that finishing slag basicity is between 3.2-3.5, terminal point C content is controlled at more than 0.06%, P content is controlled at below 0.015%, adopt Si-Al-Ba-Ca to carry out pre-deoxidation in the tapping process, tapping the early stage adopts floating plug to carry out pushing off the slag, and the later stage adopts slag stop cone to carry out pushing off the slag, forbids lower slag in the tapping process, molten steel disposable adding aluminum steel behind the argon station, Als content is controlled between the 0.040-0.060% after guaranteeing argon, blows by force behind the 3min leaving from stationly, and temperature control leaving from station is more than 1580 ℃;
The c.LF refining: liquid steel refining takes the large quantity of slag to carry out slag making, and the white slag hold-time is controlled at more than the 10min; Reductor is take calcium carbide, aluminum shot, ferrosilicon powder, aluminum steel as main; Refining is guaranteed soft blow time 〉=20min after finishing, and stops cruelly to blow phenomenon and occurs; According to the upper steel temperature of practical situation control, guarantee that middle Baogang water superheating temperature is controlled within 15 ± 5 ℃;
D. 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, secondary cooling system adopts the 8# water meter, continuous-casting steel pouring requires the whole process protection casting, unwraps greatly to water in the rear 1min and must overlap protective tube, 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;
E. heating: the strand heating is undertaken by three stage steel heating processes, considers that there are certain temperature difference in actual furnace temperature of heating furnace and strand, and maximum heating temperature is 1240 ℃;
F. rolling: as strictly to adhere to the rolling requirement of " high temperature, low speed, depress greatly ", 1050 ℃~1150 ℃ of start rolling temperatures; Adopt TMCP rolling, cool steel thickness is 80-100mm, and for guaranteeing the distortion infiltration, working roll rolling line speed is pressed≤1.5m/s control, and the one-phase finishing temperature is at 950 ℃~1000 ℃; The two-stage start rolling temperature is below 920 ℃, the two-stage take little depress rolling, guaranteeing original plate shape, finishing temperature≤860 ℃;
G. control cold: enter water temp>760 ℃, 550~600 ℃ of red temperature controls, cooling rate is controlled at 10~15 ℃/s, then is sent to powerful straightener and carries out hot straightening;
H. slow cooling: carry out slow cooling after steel plate rolls off the production line, enter burial pit temperature 〉=300 ℃; The cooling in heap time was greater than 24 hours.
The present invention is for guaranteeing good welding property and good plasticity and toughness, should control carbon equivalent Ceq in 0.43%, carbon, manganese mainly are in order to improve the intensity of steel plate, the compound add-on of Nb ﹑ V ﹑ Ti is controlled between 0.085~0.11%, mainly be for crystal grain thinning, improve steel plate plasticity and toughness.Yield strength is controlled at 470~490MPa, and tensile strength is controlled at 570~700 MPa, and elongation is controlled at 17%-26%, and 0 ℃ of V-type ballistic work is controlled at 140~160J, and intensity all reaches the performance class that has reached Q460D.The steel plate of developing is examined outward, the percentage of A-class goods 100%; The flaw detection percentage of A-class goods 100%, wherein unification level rate is that 75%, three grade of qualification rate is 25%, has reached desired result.
Description of drawings:
Below in conjunction with accompanying drawing the present invention is described further:
Fig. 1 is the structure figure of the following low-alloy high-strength structural steel of 50mm of the present invention Q460D.
Embodiment
Embodiment one:
The following low-alloy high-strength structural steel of a kind of 50mm Q460D, chemical ingredients (the unit that comprises following mass percent, wt%): C:0.14, Si:0.40, Mn:1.45, P:0.016, S:0.005, micro alloying element (V+Nb+Ti) :≤0.18, Als:0.032, other is Fe and relict element.
The following low-alloy high-strength structural steel of above-mentioned 50mm Q460D, its carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] :≤0.40.
The Main Function of above-mentioned chemical element interalloy element is analyzed as follows: C: be most basic strengthening element in the steel, improve intensity, but C affects the welding property of steel and affects toughness.Consider, the content of carbon is hanging down of control as far as possible.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.V, Nb, Ti: in steel, can be combined with C, N, form fine carbide or carbonitride, can play crystal grain thinning and dispersion-strengthened action, thereby reach the net effect of the obdurability of Effective Raise steel.Al: can play the grain refining intensificatiom effect.
The production method of the following low-alloy high-strength structural steel of a kind of 50mm Q460D may further comprise the steps:
A. KR hot metal pretreatment technology: the molten iron that arrives at a station must carry out desulfurization, guarantees desulfurized molten iron S≤0.005%, and temperature is greater than 1280 ℃; B. converter smelting process: enter stove molten iron Si content below 0.60%, molten iron temperature 〉=1270 ℃, steel scrap strictly adopts the high-quality scrap stock, process rifle position is controlled between the 1.0-1.6m, adding model in strict accordance with lime adds, guarantee that finishing slag basicity is between 3.2-3.5, terminal point C content is controlled at more than 0.06%, P content is controlled at below 0.015%, adopt Si-Al-Ba-Ca to carry out pre-deoxidation in the tapping process, tapping the early stage adopts floating plug to carry out pushing off the slag, and the later stage adopts slag stop cone to carry out pushing off the slag, forbids lower slag in the tapping process, molten steel disposable adding aluminum steel behind the argon station, Als content is controlled between the 0.040-0.060% after guaranteeing argon, blows by force behind the 3min leaving from stationly, and temperature control leaving from station is more than 1580 ℃; The c.LF refinery practice: liquid steel refining takes the large quantity of slag to carry out slag making, and the white slag hold-time is controlled at more than the 10min; Reductor is take calcium carbide, aluminum shot, ferrosilicon powder, aluminum steel as main; Refining is guaranteed soft blow time 〉=20min after finishing, and stops cruelly to blow phenomenon and occurs; According to the upper steel temperature of practical situation control, guarantee that middle Baogang water superheating temperature is controlled within 15 ± 5 ℃; D. 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, secondary cooling system adopts the 8# water meter, continuous-casting steel pouring requires the whole process protection casting, unwraps greatly to water in the rear 1min and must overlap protective tube, 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; E. heating process point: the strand heating is undertaken by three stage steel heating processes, considers that there are certain temperature difference in actual furnace temperature of heating furnace and strand, and maximum heating temperature is 1240 ℃; F. rolling technology: strictly adhere to the rolling requirement of " high temperature, low speed, depress greatly ", 1050 ℃~1150 ℃ of start rolling temperatures; Adopt TMCP rolling, cool steel thickness is 80-100mm, and for guaranteeing the distortion infiltration, working roll rolling line speed is pressed≤1.5m/s control, and the one-phase finishing temperature is at 950 ℃~1000 ℃; The two-stage start rolling temperature is below 920 ℃, the two-stage take little depress rolling, guaranteeing original plate shape, finishing temperature≤860 ℃; G. cooling control technology: enter water temp>760 ℃, 550~600 ℃ of red temperature controls, cooling rate is controlled at 10~15 ℃/s, then is sent to powerful straightener and carries out hot straightening; H. retarded cooling process: carry out slow cooling after steel plate rolls off the production line, enter burial pit temperature 〉=300 ℃; The cooling in heap time was greater than 24 hours.
Embodiment two:
The following low-alloy high-strength structural steel of a kind of 50mm Q460D, chemical ingredients (the unit that comprises following mass percent, wt%): C:0.17, Si:0.25, Mn:1.55, P:0.01, S:0.002, micro alloying element (V+Nb+Ti): 0.10, Als:0.020, other is Fe and relict element.
Its carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15]: 0.30.
Production method such as embodiment one.
Embodiment three:
The following low-alloy high-strength structural steel of a kind of 50mm Q460D, chemical ingredients (the unit that comprises following mass percent, wt%): C:0.15, Si:0.32, Mn:1.50, P:0.014, S:0.004, micro alloying element (V+Nb+Ti): 0.15, Als:0.028, other is Fe and relict element.
Its carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15]: 0.36.
Production method such as embodiment one.
Steel plate machinery Performance Detection composition and mechanical mechanics property are pressed GB/T16270-2009 and are carried out, and specifically see Table 1.
[0021]Table 1 Q460D steel plate mechanical mechanics property
The metallographic detected result is as shown in table 2:
Table 2: metallographic detected result table
This produces 20 crowdes of the thick Q460D of 50mm altogether as a trial, yield strength is controlled at 470~490MPa, and tensile strength is controlled at 570~700 MPa, and elongation is controlled at 17%-26%, 0 ℃ of V-type ballistic work is controlled at 140~160J, and intensity has all reached the performance class of Q460D.
Outer inspection and carrying out flaw detection surface quality require to press the GB/T709-2008 strict implement;
Flaw detection is carried out GB/T2970-2004 III level non-destructive testing standard and is carried out;
The steel plate of developing is examined outward, the percentage of A-class goods 100%; The flaw detection percentage of A-class goods 100%, wherein unification level rate is that 75%, three grade of qualification rate is 25%, has reached desired result.
Claims (1)
1. the following low-alloy high-strength structural steel of 50mm Q460D, it is characterized in that: the chemical ingredients (unit that comprises following mass percent, wt%): C:0.14~0.17, Si:0.25~0.40, Mn:1.45~1.55, P :≤0.018, S :≤0.005, micro alloying element V+Nb+Ti :≤0.20, Als :≤0.035, other is Fe and relict element, its carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] :≤0.42, the production method of the following low-alloy high-strength structural steel of described 50mm Q460D may further comprise the steps:
A. KR hot metal pretreatment: the molten iron that arrives at a station must carry out desulfurization, guarantees desulfurized molten iron S≤0.005%, and temperature is greater than 1280 ℃;
B. converter smelting: enter stove molten iron Si content below 0.60%, molten iron temperature 〉=1270 ℃, steel scrap strictly adopts the high-quality scrap stock, process rifle position is controlled between the 1.0-1.6m, adding model in strict accordance with lime adds, guarantee that finishing slag basicity is between 3.2-3.5, terminal point C content is controlled at more than 0.06%, P content is controlled at below 0.015%, adopt Si-Al-Ba-Ca to carry out pre-deoxidation in the tapping process, tapping the early stage adopts floating plug to carry out pushing off the slag, and the later stage adopts slag stop cone to carry out pushing off the slag, forbids lower slag in the tapping process, molten steel disposable adding aluminum steel behind the argon station, Als content is controlled between the 0.040-0.060% after guaranteeing argon, blows by force behind the 3min leaving from stationly, and temperature control leaving from station is more than 1580 ℃;
The c.LF refining: liquid steel refining takes the large quantity of slag to carry out slag making, and the white slag hold-time is controlled at more than the 10min; Reductor is take calcium carbide, aluminum shot, ferrosilicon powder, aluminum steel as main; Refining is guaranteed soft blow time 〉=20min after finishing, and stops cruelly to blow phenomenon and occurs; According to the upper steel temperature of practical situation control, guarantee that middle Baogang water superheating temperature is controlled within 15 ± 5 ℃;
D. 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, secondary cooling system adopts the 8# water meter, continuous-casting steel pouring requires the whole process protection casting, unwraps greatly to water in the rear 1min and must overlap protective tube, 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;
E. heating: the strand heating is undertaken by three stage steel heating processes, considers that there are certain temperature difference in actual furnace temperature of heating furnace and strand, and maximum heating temperature is 1240 ℃;
F. rolling: as strictly to adhere to the rolling requirement of " high temperature, low speed, depress greatly ", 1050 ℃~1150 ℃ of start rolling temperatures; Adopt TMCP rolling, cool steel thickness is 80-100mm, and for guaranteeing the distortion infiltration, working roll rolling line speed is pressed≤1.5m/s control, and the one-phase finishing temperature is at 950 ℃~1000 ℃; The two-stage start rolling temperature is below 920 ℃, the two-stage take little depress rolling, guaranteeing original plate shape, finishing temperature≤860 ℃;
G. control cold: enter water temp>760 ℃, 550~600 ℃ of red temperature controls, cooling rate is controlled at 10~15 ℃/s, then is sent to powerful straightener and carries out hot straightening;
H. slow cooling: carry out slow cooling after steel plate rolls off the production line, enter burial pit temperature 〉=300 ℃; The cooling in heap time was greater than 24 hours.
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