CN102400041A - Extra-thick, low-alloy and high-strength Q390D-Z35 steel plate and production method thereof - Google Patents
Extra-thick, low-alloy and high-strength Q390D-Z35 steel plate and production method thereof Download PDFInfo
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Abstract
The invention discloses an extra-thick, low-alloy and high-strength Q390D-Z35 steel plate which comprises the following chemical components in percentage by weight: 0.10-0.16wt% of C, 0.20-0.40wt% of Si, 1.35-1.55wt% of Mn, less than or equal to 0.015wt% of P, less than or equal to 0.003wt% of S; less than or equal to 0.20wt% of micro-alloying elements (Nb+V+Ti+Ni), less than or equal to 0.040wt% of Als and the balance of Fe and residual elements, wherein the carbon equivalent [Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15] is less than or equal to 0.47. By virtue of a series of technical processes comprising convertor smelting, LF (ladle furnace) refining, vacuum refining, die casting and pouring, ingot heating, rolling, cold control, annealing and thermal treatment, and through reasonably adopting the chemical component design of multi-element composite microalloy elements and utilizing an LF+VD (vacuum degassing) process, the cleanliness of steel is ensured, and the summation of levels of various foreign substances is not more than 3.0; through rolling control and cold control+ normalizing treatment, the grain size of the steel reaches the level of 8.0-10.0; and through effectively implementing the measures, the extra-thick, low-alloy and high-strength Q390D-Z35 steel plate which has the thickness being not less than 140mm and is capable of protecting flaw detection and mechanical properties can be successfully produced.
Description
Technical field
The invention belongs to the steel plate production technical field, be specifically related to a kind of ultra-thick low-alloy high-strength Q390D-Z35 steel plate and working method thereof.
Background technology
Along with developing rapidly of Chinese national economy, the development of high-end equipment is also thick towards the spy, extra wide, high-performance direction develop.Q390D-Z35 has proposed higher requirement to steel plate obdurability, anti-lamellar tearing ability etc., the above steel plate of intensity rank more than 390MPa of present thickness 100mm, and fertile at home steel mill is also few.And the anti-lamellar tearing of the Q390D-Z35 of thickness more than 140mm is used steel, because of reasons such as its production difficulty is big, the tooling requirement is special can't be produced.
Summary of the invention
To the problems referred to above, ultra-thick low-alloy high-strength Q390D-Z35 steel plate and working method thereof that the present invention provides a kind of guaranteed cost, protects flaw detection, protects lamellar tearing.
A kind of ultra-thick low-alloy high-strength Q390D-Z35 steel plate; Comprise following chemical components in mass percent (unit; Wt%): C:0.10～0.16, Si:0.20～0.40, Mn:1.35～1.55, P :≤0.015, S :≤0.003, micro alloying element (Nb+V+Ti+Ni) :≤0. 20, Als :≤0.040, other is Fe and relict element.
The carbon equivalent of said chemical ingredients≤0.47.
The function analysis of above-mentioned chemical element is following:
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.
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.
Ni: an amount of adding can effectively improve the low-temperature impact toughness of steel plate.
Al: can play the crystal grain thinning strengthening effect.
Said ultra-thick low-alloy high-strength Q390D-Z35 steel plate thickness is more than 140mm.
For achieving the above object, the working method that the present invention takes comprises the steps:
Converter smelting: tapping carbon>=0.05%, tapping P≤0.012%, S≤0.005%, point blows number of times and must not avoid slag under the tapping process greater than 2 times;
LF refining: guarantee that the white slag hold-time is controlled at more than the 15min;
Vacuum refinement: the dwell time under≤67Pa is controlled by>=18min;
Heating: the holding temperature of dead soaking pit is controlled at 1200 ℃～1300 ℃;
Rolling: use two stage rolling, 1050 ℃～1150 ℃ of stage start rolling temperatures, two-stage start rolling temperature are at 800～870 ℃, and reduction in pass is 10～20mm, finishing temperature 780-850 ℃;
Control cold: return red temperature 600-690 ℃;
Slow cooling: go into burial pit temperature >=350 ℃, cooling in heap time >=28 hour;
Thermal treatment: 900 ± 20 ℃ of holding temperatures, during insulation 1.9-2.2mim/mm+1.5 hour, the steel plate back water-cooled 5-70S that comes out of the stove.
Through converter smelting, LF refining, vacuum refinement, die casting cast, steel ingot heating, rolling, control is cold, slow cooling, thermal treatment series of process flow process; And through reasonably taking the chemical composition design of polynary composite micro-alloyed 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 8.0～10.0 grades through controlled rolling and controlled cooling+normalizing treatment, through the above-mentioned effective enforcement that waits measure, successfully produced >=the special thick guarantor's flaw detection of 140 mm, protected the low-alloy high-strength Q390D-Z35 steel plate of mechanical property.
To whole thermal treatment whole process, worked out strict process point control standard from hot metal pretreatment, and strict the execution, the quality in kind of product has reached Q390D-Z35 level level.Its ys is controlled at 370～440MPa, and tensile strength is controlled at 510～570MPa; Elongation is controlled at 20%-25%;-20 ℃ of V-type ballistic works are controlled at 112～196J; Z is distributed between the 32-55 to performance, and all greater than 40%, performance index have satisfied the Q390D-Z35 development requires to 3 Z of individual sample fully to performance MV.
Description of drawings
Below in conjunction with accompanying drawing, the present invention is done further elaboration.
Fig. 1 is the metallographic structure figure (100X) of TMCP of the present invention after rolling.
Fig. 2 is the metallographic structure figure (100X) after the thermal treatment of the present invention.
Embodiment
The guaranteed cost of the thick degree of spy according to the invention more than 140mm, protect flaw detection, protect lamellar tearing ultra-thick low-alloy high-strength Q390D-Z35 steel plate and comprise following chemical components in mass percent (unit; Wt%): C:0.10～0.16, Si:0.20～0.40, Mn:1.35～1.55, P :≤0.015, S :≤0.003, micro alloying element (Nb+V+Ti+Ni) :≤0. 20, Als :≤0.040, other is Fe and relict element.
Carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] :≤0.47.
The working method that the present invention takes comprises: converter smelting, LF refining, vacuum refinement, die casting cast, steel ingot heating, rolling, control is cold, slow cooling, thermal treatment.In said converter smelting, tapping carbon>=0.05%, tapping P≤0.012%, S≤0.005%; Point blows number of times and must not avoid slag under the tapping process greater than 2 times; In said LF refining, take the big quantity of slag to carry out slag making, guarantee that the white slag hold-time is controlled at more than the 15min; In said vacuum refinement, the dwell time under≤67Pa is controlled by>=18min; Pine in said adding, the holding temperature of dead soaking pit is controlled at 1200 ℃～1300 ℃; Said rolling in, adopt two stage rolling, 1050 ℃～1150 ℃ of stage start rolling temperatures adopt high temperature low speed to depress rolling greatly; The two-stage start rolling temperature is at 800～870 ℃, and the two-stage takes to depress for a short time rolling, and reduction in pass is 10～20mm, finishing temperature 780-850 ℃; In said control is cold, return red temperature 600-690 ℃; In said slow cooling, go into burial pit temperature>=350 ℃; Cooling in heap time>=28 hour; In the said thermal treatment, 900 ± 20 ℃ of holding temperatures, during insulation 1.9-2.2mim/mm+1.5 hour, the steel plate back water-cooled 5-70S that comes out of the stove.
Embodiment 1
Through converter smelting, LF refining, vacuum refinement, die casting cast, steel ingot heating, rolling, control is cold, slow cooling, thermal treatment process; Acquisition is described in table 1 below the ultra-thick low-alloy high-strength Q390D-Z35 Finished Steel of chemical ingredients, and wherein casting process parameter and mechanical property are seen like following table 3,4.
The chemical ingredients of table 1 embodiment 1 steel
Embodiment 2
Through converter smelting, LF refining, vacuum refinement, die casting cast, steel ingot heating, rolling, control is cold, slow cooling, thermal treatment process; Acquisition is described in table 2 below the ultra-thick low-alloy high-strength Q390D-Z35 Finished Steel of chemical ingredients, and wherein casting process parameter and mechanical property are seen like following table 3,4.
The chemical ingredients of table 2 embodiment 2 steel
Operational path of the present invention: slow cooling → surface inspection → thermal treatment → finishing → flaw detection → detection → judgement → salable product warehouse-in is aligned → is rolled off the production line in the dark desulfurization → converter smelting of molten iron KR → LF refining → VD vacuum-treat → ingot casting cast → steel ingot heating → dephosphorization → controlled rolling → controlled chilling → control.
The steel-making part: the chemical composition design of steel plate of the present invention adopts low-carbon-equivalent, and Mn-Nb-V-Ni is ferritic+perlitic steel, and the strengthening mechanism of application is build up, refined crystalline strengthening, precipitation strength and solution strengthening.Main and other element formation carbide of C plays build up and precipitation strength effect, improves armor plate strength; Mn mainly plays solution strengthening and reduces transformation temperature, works to improve armor plate strength; Nb plays the refined crystalline strengthening effect, and during the steel ingot heating, the Nb of solid solution can stop austenite crystal to be grown up; Rolling through the two-stage, the C of V, Nization thing are separated out, and improve armor plate strength; The effect of Ni mainly is to increase austenitic condensate depression, plays the refined crystalline strengthening effect, can improve low-temperature impact toughness in addition.For guaranteeing flaw detection, take the Clean Steel smelting technology simultaneously, the steel grade of keeping under strict control [P], [S], [N], [H], [O] five big harmful constituent contents.
Ingot shape is selected: qualified for guaranteeing to detect a flaw, consider compression ratio at least >=5.Conventional ingot casting is selected 24T ﹑ 26T ﹑ 32T ﹑ 33T, and the water cooled mo(u)ld ingot is selected 36-40T, preferred 36T water cooled mo(u)ld, and this steel ingot thickness 780mm, ingot mould chassis and the cooling of water flowing all around, the insulation of cap mouth, compression ratio 5.57 can reach design requirements.
Converter smelting: control tapping carbon>=0.05%, tapping P≤0.012%, S≤0.005% by Clean Steel smelting technology standard; Point blows number of times and must not avoid slag under the tapping process greater than 2 times.
The LF refining: take the big quantity of slag to carry out slag making, really how the white slag hold-time is controlled at more than the 15min; Stop the rare phenomenon of slag; Carry out the Argon operation in strict accordance with the Argon standard, forbid blowing cruelly.
Vacuum refinement: the dwell time under≤67Pa is controlled by>=18min; Carry out Ca behind the vacuum breaker immediately and handle, inclusion is carried out modification, soft blow is hung steel after greater than 2min.
Cast: adhere to " high temperature is annotated slowly, and low temperature is annotated soon " principle.Concrete pouring technology will be asked for an interview to table 3.
Table 3 die casting casting process
Annotate: T
LlRepresent liquidus temperature, motor-car, raising one's hat and taking off the ingot time begins to calculate from having annotated.
The steel rolling heating: the steel ingot heating is undertaken by 36T water cooled mo(u)ld ingot casting low-alloy series heating process, fully grills thoroughly, burns evenly to guarantee steel; The holding temperature of dead soaking pit is according to 1200 ℃～1300 ℃ execution.
Rolling: adopt two stage rolling, 1050 ℃～1150 ℃ of stage start rolling temperatures, the rolling requirement of " high temperature, low speed, depress greatly " is adhered in strictness; For guaranteeing the distortion infiltration; When thickness of slab>=450mm, reduction in pass is by 60 ± 10mm control, and working roll rolling line speed is by≤1.5m/s control; Cool steel thickness is 300mm, and the two-stage start rolling temperature is at 800～870 ℃, and the two-stage takes to depress for a short time rolling, and reduction in pass is 15～20mm, finishing temperature 780-850 ℃.
Control cold: rolling back gets into a little less than twice of the ACC cold, reduces the surface and the inner temperature difference as far as possible, guarantees to return red temperature at 600-670 ℃, is sent to powerful straightener after the cooling and carries out hot straightening.
Slow cooling: carry out slow cooling after steel plate rolls off the production line, go into burial pit temperature >=350 ℃; Cooling in heap time >=24 hour.
Thermal treatment: carrying out technology is 900 ± 20 ℃ of holding temperatures, during insulation 1.9-2.2mim/mm+1.5 hour, and the steel plate back water-cooled 5-70S that comes out of the stove.
Chemical Composition
:Main and other element formation carbide of C plays build up and precipitation strength effect, improves armor plate strength; Mn mainly plays solution strengthening and reduces transformation temperature, works to improve armor plate strength; Nb plays the refined crystalline strengthening effect, and during the steel ingot heating, the Nb of solid solution can stop austenite crystal to be grown up; Rolling through the two-stage, the C of V, Nization thing are separated out, and improve armor plate strength; The effect of Ni mainly is to increase austenitic condensate depression, plays the refined crystalline strengthening effect, can improve low-temperature impact toughness in addition.P, S content are controlled in the lower scope, and in a word, whole Composition Control is more stable, satisfy the composition design requirements of the anti-lamellar tearing steel plate of Q390D-Z35.
Composition and mechanical mechanics property are pressed GB/T1591-2008 and are carried out, and specifically see table 4.
Table 4 Q390D-Z35 steel plate mechanical mechanics property
| Steel grade, specification | Requirement | Ys/Mpa | Tensile strength/Mpa | Elongation/% | Ballistic work/J (20 ℃) | Z is to performance |
| Q390D-Z35 | GB | ≥310 | 470～620 | ≥18 | ≥34 | ≥35 |
| 140 | Actual | 370～440 | 510～570 | 20～25 | 112-196 | 32-55 |
This produces 8 crowdes of thick Q390D-Z35 of 140mm altogether as a trial, and wherein: ys is controlled at 370～440MPa, and tensile strength is controlled at 510～570 MPa; Elongation is controlled at 20%-25%;-20 ℃ of V-type ballistic works are controlled at 112～196J; Z is distributed between the 32-55 to performance, and all greater than 40%, performance index have satisfied the Q390D-Z35 development requires to 3 Z of individual sample fully to performance MV.Simultaneously in order further to understand the in kind real performance level of this time experiment, the steel plate of this time experiment to be carried out-40 ℃ of V-type ballistic work indexs detect, its value is controlled at 86～102J.The result shows that the 140mm ultra-thick low-alloy high-strength steel plate Q390D-Z35 of this exploitation has reached the performance class of the thick Q390E of 140mm.
Outer inspection and flaw detection: the steel plate of being developed is examined outward, and the percentage of A-class goods 100% is detected a flaw by JB/T 2970-2004, and closing three grades of rates is 100%, has reached desired result.
Metallographic examination: 1/4 place has done the metallographic structure check respectively to the product thickness after controlled rolling and the normalizing, and the result sees Fig. 1, Fig. 2.
Metallographic structure after the control bundle of table 5 product and the normalizing
Associative list 5 and Fig. 1, Fig. 2 analysis, the steel plate after the controlled rolling is organized as ferritic and perlite, and grain fineness number reaches 8～9 grades.After the normalizing treatment, ferritic and pearlitic structure in the steel plate are more even, and grain refining reaches 8.0～10 grades.
Claims (4)
1. ultra-thick low-alloy high-strength Q390D-Z35 steel plate; It is characterized in that: it comprises following chemical components in mass percent (unit; Wt%): C:0.10～0.16, Si:0.20～0.40, Mn:1.35～1.55, P :≤0.015, S :≤0.003, micro alloying element (Nb+V+Ti+Ni) :≤0. 20, Als :≤0.040, other is Fe and relict element.
2. ultra-thick low-alloy high-strength Q390D-Z35 steel plate as claimed in claim 1 is characterized in that: the carbon equivalent of said chemical ingredients≤0.47.
3. ultra-thick low-alloy high-strength Q390D-Z35 steel plate as claimed in claim 1 is characterized in that: said ultra-thick low-alloy high-strength Q390D-Z35 steel plate thickness is more than 140mm.
4. the working method of ultra-thick low-alloy high-strength Q390D-Z35 steel plate as claimed in claim 1, it is characterized in that: it comprises the steps:
Converter smelting: tapping carbon>=0.05%, tapping P≤0.012%, S≤0.005%, point blows number of times and must not avoid slag under the tapping process greater than 2 times;
LF refining: guarantee that the white slag hold-time is controlled at more than the 15min;
Vacuum refinement: the dwell time under≤67Pa is controlled by>=18min;
Heating: the holding temperature of dead soaking pit is controlled at 1200 ℃～1300 ℃;
Rolling: use two stage rolling, 1050 ℃～1150 ℃ of stage start rolling temperatures, two-stage start rolling temperature are at 800～870 ℃, and reduction in pass is 10～20mm, finishing temperature 780-850 ℃;
Control cold: return red temperature 600-690 ℃;
Slow cooling: go into burial pit temperature >=350 ℃, cooling in heap time >=28 hour;
Thermal treatment: 900 ± 20 ℃ of holding temperatures, during insulation 1.9-2.2mim/mm+1.5 hour, the steel plate back water-cooled 5-70S that comes out of the stove.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103352172A (en) * | 2013-05-28 | 2013-10-16 | 武汉钢铁(集团)公司 | Sea platform steel having thickness of 150mm, and production method thereof |
| CN103397251A (en) * | 2013-08-05 | 2013-11-20 | 武汉钢铁(集团)公司 | 150-190 mm thick bridge steel produced by continuous casting slab and technology thereof |
| CN105603303A (en) * | 2015-12-25 | 2016-05-25 | 钢铁研究总院 | High-strength ultra-thick steel plate |
| WO2016112682A1 (en) * | 2015-01-12 | 2016-07-21 | 南京钢铁股份有限公司 | Normalized acid-resistant pressure vessel steel plate and manufacturing method thereof |
| CN107557690A (en) * | 2016-06-30 | 2018-01-09 | 鞍钢股份有限公司 | The super-thick steel plate and its manufacture method of a kind of low temperature resistant and anti-lamellar tearing |
| CN108149135A (en) * | 2017-12-08 | 2018-06-12 | 南阳汉冶特钢有限公司 | A kind of Q390E grades of molding steel plates of 420mm thickness low-temperature impact and its production method |
| CN115807194A (en) * | 2022-12-20 | 2023-03-17 | 南阳汉冶特钢有限公司 | Production method of Q345B steel plate with thickness of 150-250mm |
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| CN102041437A (en) * | 2010-12-22 | 2011-05-04 | 南阳汉冶特钢有限公司 | 160mm-thick Q345E-Z35 steel plate for high-rise buildings and production method thereof |
| CN102061424A (en) * | 2010-12-21 | 2011-05-18 | 南阳汉冶特钢有限公司 | Super-thick Q390GJC-Z35 steel plate for high-rise buildings and production method thereof |
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| CN102041437A (en) * | 2010-12-22 | 2011-05-04 | 南阳汉冶特钢有限公司 | 160mm-thick Q345E-Z35 steel plate for high-rise buildings and production method thereof |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103352172A (en) * | 2013-05-28 | 2013-10-16 | 武汉钢铁(集团)公司 | Sea platform steel having thickness of 150mm, and production method thereof |
| CN103397251A (en) * | 2013-08-05 | 2013-11-20 | 武汉钢铁(集团)公司 | 150-190 mm thick bridge steel produced by continuous casting slab and technology thereof |
| CN103397251B (en) * | 2013-08-05 | 2015-05-13 | 武汉钢铁(集团)公司 | 150-190 mm thick bridge steel produced by continuous casting slab and technology thereof |
| WO2016112682A1 (en) * | 2015-01-12 | 2016-07-21 | 南京钢铁股份有限公司 | Normalized acid-resistant pressure vessel steel plate and manufacturing method thereof |
| CN105603303A (en) * | 2015-12-25 | 2016-05-25 | 钢铁研究总院 | High-strength ultra-thick steel plate |
| CN105603303B (en) * | 2015-12-25 | 2017-06-23 | 钢铁研究总院 | A kind of high strength ultra-thick steel plates |
| CN107557690A (en) * | 2016-06-30 | 2018-01-09 | 鞍钢股份有限公司 | The super-thick steel plate and its manufacture method of a kind of low temperature resistant and anti-lamellar tearing |
| CN107557690B (en) * | 2016-06-30 | 2019-03-26 | 鞍钢股份有限公司 | The super-thick steel plate and its manufacturing method of a kind of low temperature resistant and anti-lamellar tearing |
| CN108149135A (en) * | 2017-12-08 | 2018-06-12 | 南阳汉冶特钢有限公司 | A kind of Q390E grades of molding steel plates of 420mm thickness low-temperature impact and its production method |
| CN108149135B (en) * | 2017-12-08 | 2019-12-03 | 南阳汉冶特钢有限公司 | A kind of Q390E grades of molding steel plates of 420mm thickness low-temperature impact and its production method |
| CN115807194A (en) * | 2022-12-20 | 2023-03-17 | 南阳汉冶特钢有限公司 | Production method of Q345B steel plate with thickness of 150-250mm |
| CN115807194B (en) * | 2022-12-20 | 2024-03-15 | 南阳汉冶特钢有限公司 | Production method of Q345B steel plate with thickness of more than 150mm and less than or equal to 250mm |
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Application publication date: 20120404 |