CN102094148A - 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 industry and desired strength height, lightweight construction that load is big 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.Accomplish to reduce cost under the prerequisite that guarantees steel mechanics performance, optimize technical process, company has dropped into great amount of manpower research 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, technology, tissue, performance analysis, expectation formed a cover from composition design, steel billet smelt, the systemic production technique of steel plate rolling.Technology can guarantee final performance demands, has reduced cost again, for company has increased huge economic benefit.
Summary of the invention
Therefore, purpose of the present invention mainly is can guarantee final performance demands in order to provide a kind of, reduced cost, guaranteed cost, guarantor's flaw detection again, increased the 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, comprise following chemical components in mass percent (unit, 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 analysis of above-mentioned chemical element interalloy element is as follows: C: be most basic strengthening element in the steel, improve intensity, but C influences the welding property of steel and influences toughness.Take all factors into consideration, 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 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 production method of the following low-alloy high-strength structural steel of a kind of 50mm Q460D may further comprise the steps:
The 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: go into stove molten iron Si content below 0.60%, molten iron temperature 〉=1270 ℃, the strict high-quality scrap stock that adopt of steel scrap, 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 adopts floating plug to carry out pushing off the slag early stage, and the later stage adopts slag stop cone to carry out pushing off the slag, slag under forbidding 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 behind the 3min leaving from stationly by force, and temperature control leaving from station is more than 1580 ℃;
The c.LF refining: liquid steel refining takes the big quantity of slag to carry out slag making, and the white slag hold-time is controlled at more than the 10min; Reductor is based on calcium carbide, aluminum shot, ferrosilicon powder, aluminum steel etc.; Refining is guaranteed soft blow time 〉=20min after finishing, and stops to blow cruelly phenomenon and takes place; The steel temperature is gone up in control according to practical situation, and Baogang's water superheating temperature is controlled within 15 ± 5 ℃ in guaranteeing;
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 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;
E. heating: strand heating III group steel heating process carries out, and considers that there are certain temperature difference in actual furnace temperature of heating furnace and strand, and maximum heating temperature is 1240 ℃;
F. rolling: the rolling requirement of " high temperature, low speed, depress greatly ", 1050 ℃～1150 ℃ of start rolling temperatures are adhered in strictness; 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 a stage finishing temperature is at 950 ℃～1000 ℃; The two-stage start rolling temperature is below 920 ℃, and the two-stage takes to depress for a short time rolling, guaranteeing original plate shape, and finishing temperature≤860 ℃;
G. control cold: go into water temp＞760 ℃, return 550～600 ℃ of red temperature controls, cooling rate is controlled at 10～15 ℃/s, is sent to powerful straightener then and carries out hot straightening;
H. slow cooling: carry out slow cooling after steel plate rolls off the production line, go into 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 570～700MPa, 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 being developed 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, comprise following chemical components in mass percent (unit, 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 analysis of above-mentioned chemical element interalloy element is as follows: C: be most basic strengthening element in the steel, improve intensity, but C influences the welding property of steel and influences toughness.Take all factors into consideration, 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 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 production method of the following low-alloy high-strength structural steel of a kind of 50mm Q460D may further comprise the steps:
The 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: go into stove molten iron Si content below 0.60%, molten iron temperature 〉=1270 ℃, the strict high-quality scrap stock that adopt of steel scrap, 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 adopts floating plug to carry out pushing off the slag early stage, and the later stage adopts slag stop cone to carry out pushing off the slag, slag under forbidding 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 behind the 3min leaving from stationly by force, and temperature control leaving from station is more than 1580 ℃; The c.LF refinery practice: liquid steel refining takes the big quantity of slag to carry out slag making, and the white slag hold-time is controlled at more than the 10min; Reductor is based on calcium carbide, aluminum shot, ferrosilicon powder, aluminum steel etc.; Refining is guaranteed soft blow time 〉=20min after finishing, and stops to blow cruelly phenomenon and takes place; The steel temperature is gone up in control according to practical situation, and Baogang's water superheating temperature is controlled within 15 ± 5 ℃ in guaranteeing; 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 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; E. heating process point: strand heating III group steel heating process carries out, and 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: the rolling requirement of " high temperature, low speed, depress greatly ", 1050 ℃～1150 ℃ of start rolling temperatures are adhered in strictness; 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 a stage finishing temperature is at 950 ℃～1000 ℃; The two-stage start rolling temperature is below 920 ℃, and the two-stage takes to depress for a short time rolling, to guarantee original plate shape, 5860 ℃ of finishing temperatures; G. cooling control technology: go into water temp＞760 ℃, return 550～600 ℃ of red temperature controls, cooling rate is controlled at 10～15 ℃/s, is sent to powerful straightener then and carries out hot straightening; H. retarded cooling process: carry out slow cooling after steel plate rolls off the production line, go into 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, comprise following chemical components in mass percent (unit, 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, comprise following chemical components in mass percent (unit, 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.
The steel plate mechanical property detects composition and mechanical mechanics property is pressed the GB/T16270-2009 execution, specifically sees Table 1.
Table 1Q460D 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 570～700MPa, 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 strict execution of GB/T709-2008;
Flaw detection is carried out GB/T2970-2004III level non-destructive testing standard and is carried out;
The steel plate of being developed 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 (3)
1. the following low-alloy high-strength structural steel of 50mm Q460D, it is characterized in that: comprise following chemical components in mass percent (unit, 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.
2. the following low-alloy high-strength structural steel of 50mm as claimed in claim 1 Q460D is characterized in that: its carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] :≤0.42.
3. the production method of the following low-alloy high-strength structural steel of 50mm as claimed in claim 1 Q460D is characterized in that: may further comprise the steps:
The 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: go into stove molten iron Si content below 0.60%, molten iron temperature 〉=1270 ℃, the strict high-quality scrap stock that adopt of steel scrap, 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 adopts floating plug to carry out pushing off the slag early stage, and the later stage adopts slag stop cone to carry out pushing off the slag, slag under forbidding 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 behind the 3min leaving from stationly by force, and temperature control leaving from station is more than 1580 ℃;
The c.LF refining: liquid steel refining takes the big quantity of slag to carry out slag making, and the white slag hold-time is controlled at more than the 10min; Reductor is based on calcium carbide, aluminum shot, ferrosilicon powder, aluminum steel etc.; Refining is guaranteed soft blow time 〉=20min after finishing, and stops to blow cruelly phenomenon and takes place; The steel temperature is gone up in control according to practical situation, and Baogang's water superheating temperature is controlled within 15 ± 5 ℃ in guaranteeing;
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 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;
E. heating: strand heating III group steel heating process carries out, and considers that there are certain temperature difference in actual furnace temperature of heating furnace and strand, and maximum heating temperature is 1240 ℃;
F. rolling: the rolling requirement of " high temperature, low speed, depress greatly ", 1050 ℃～1150 ℃ of start rolling temperatures are adhered in strictness; 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 a stage finishing temperature is at 950 ℃～1000 ℃; The two-stage start rolling temperature is below 920 ℃, and the two-stage takes to depress for a short time rolling, guaranteeing original plate shape, and finishing temperature≤860 ℃;
G. control cold: go into water temp＞760 ℃, return 550～600 ℃ of red temperature controls, cooling rate is controlled at 10～15 ℃/s, is sent to powerful straightener then and carries out hot straightening;
H. slow cooling: carry out slow cooling after steel plate rolls off the production line, go into burial pit temperature 〉=300 ℃; The cooling in heap time was greater than 24 hours.
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| CN109706403A (en) * | 2019-02-28 | 2019-05-03 | 辽宁科技学院 | A kind of Q460E steel plate and its rolling mill practice |
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| CN114807768A (en) * | 2022-05-16 | 2022-07-29 | 承德建龙特殊钢有限公司 | Q420 low-alloy high-strength structural steel and production method thereof |
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| CN101705433A (en) * | 2009-09-29 | 2010-05-12 | 燕山大学 | 196 DEG C below zero ultralow-temperature quake-proof structural steel |
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| CN102345060A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | S355J2 boron steel plate without surface crack and production method thereof |
| CN102345060B (en) * | 2011-06-28 | 2014-07-30 | 南阳汉冶特钢有限公司 | S355J2 boron steel plate without surface crack and production method thereof |
| CN102345050A (en) * | 2011-07-08 | 2012-02-08 | 南阳汉冶特钢有限公司 | Method for producing flaw detection and performance guaranteed Q235B steel plate with 80-100mm in argon station |
| CN103045966A (en) * | 2012-12-30 | 2013-04-17 | 南阳汉冶特钢有限公司 | High-quality and high-yield strength structural steel S620QL1 steel plate and production method thereof |
| CN103243270A (en) * | 2012-12-30 | 2013-08-14 | 南阳汉冶特钢有限公司 | Novel low-cost, wear-resistant and high-strength Q460B steel plate and production method thereof |
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| CN103695599A (en) * | 2013-12-16 | 2014-04-02 | 江油市长祥特殊钢制造有限公司 | Low-alloy steel CBM20 microalloying method |
| CN104313468A (en) * | 2014-11-14 | 2015-01-28 | 武汉钢铁(集团)公司 | Steel plate for 460MPa grade low-alloy high-strength structure and production method of steel plate |
| CN104946975A (en) * | 2015-07-13 | 2015-09-30 | 攀钢集团成都钢钒有限公司 | Raw material steel of seamless steel pipe for drill pipe of rotary drilling rig and smelting method of raw material steel |
| CN105018836A (en) * | 2015-07-13 | 2015-11-04 | 攀钢集团成都钢钒有限公司 | Manufacturing method for precision seamless steel tube for drill rod of rotary drilling rig |
| CN109706403A (en) * | 2019-02-28 | 2019-05-03 | 辽宁科技学院 | A kind of Q460E steel plate and its rolling mill practice |
| CN112458375A (en) * | 2020-12-08 | 2021-03-09 | 本钢板材股份有限公司 | Special steel for ASTM A656 Gr70 support pipe and preparation method thereof |
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