CN102041432A - Q420GJD-Z35 steel plate with thickness of less than or equal to 60 millimeters for high-rise building and production method thereof - Google Patents
Q420GJD-Z35 steel plate with thickness of less than or equal to 60 millimeters for high-rise building and production method thereof Download PDFInfo
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Abstract
The invention discloses a Q420GJD-Z35 steel plate with thickness of less than or equal to 60 millimeters for a high-rise building and a production method thereof. The steel plate comprises the following chemical components in percentage by mass: 0.10 to 0.17 percent of C, 0.20 to 0.50 percent of Si, 1.20 to 1.60 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.10 percent of microalloyed elements (Nb+V+Ti), less than or equal to 0.050 percent of Als and the balance of Fe and residual elements. The production method comprises the steps of performing converter smelting, ladle furnace (LF) refining, vacuum refining, continuous casting, heating, rolling, cooling control, slow cooling and heat treatment. Optimized components and a rolling process are controlled strictly, so that the material quality of the product reaches the Q420GJD-Z35 level, the yield strength is controlled to be between 400 and 480 MPa, the tensile strength is controlled to be between 540 and 630 MPa, the yield ratio is less than or equal to 0.80, the elongation ratio is controlled to be between 22 and 27 percent, V-type impact power at -20 DEG C is controlled to be between 153 and 280 J, the Z-direction performance is distributed between 32 and 57, the average value of three Z-direction performance of a single sample is over 40 percent, and the performance index completely meets the Q420GJD-Z35 development requirement.
Description
Technical field
The present invention relates to steel, be specifically related to a kind of≤60mm Highrise buildings Q420GJD-Z35 steel plate and production method thereof.
Background technology
Along with developing rapidly of Chinese national economy, Highrise buildings is also thick towards the spy with the development of steel, extra wide, high-performance direction develop.Highrise buildings has proposed higher requirement with steel to steel plate obdurability, yield tensile ratio, anti-lamellar tearing ability etc., since Highrise buildings with steel to existence requirement on the intensity, and require the yield tensile ratio index, the above steel plate for tall building of present D rank, usually adopt Alloying Treatment, alloy proportion is unreasonable easily to cause intensity to exceed standard, yield tensile ratio is unreasonable or Z is not up to standard to performance, and domestic fertile steel mill qualification rate is not high.
Summary of the invention
At the problems referred to above, the inventor has obtained a kind of thickness at the steel plate for tall building of detecting a flaw less than 60mm Highrise buildings Q420GJD-Z35 guaranteed cost, guarantor, thereby has finished the present invention through groping.
Therefore, the object of the present invention is to provide a kind of thickness≤60mm guaranteed cost, guarantor's flaw detection Highrise buildings Q420GJD-Z35 steel plate.
Another object of the present invention is to provide the production method of this this steel plate.
For reaching above-mentioned first purpose, the technical scheme that the present invention takes is this guaranteed cost, protect the flaw detection Highrise buildings with the Q420GJD-Z35 steel plate comprise following chemical components in mass percent (unit, wt%):
C:0.10～0.17, Si:0.20～0.50, Mn:1.20～1.60, P :≤0.015, S :≤0.005, micro alloying element (Nb+V+Ti)≤0. 10, Als :≤0.050, other is Fe and relict element.
The function analysis of above-mentioned chemical 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.
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: easily form the MnS type impurity, have certain red brittleness, belong to harmful element in this steel grade, that should control is low as far as possible.
, 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.
:Can play the crystal grain thinning strengthening effect.
Described guaranteed cost, the guarantor Highrise buildings steel plate Q420GJD-Z35 thickness≤60mm that detects a flaw.
For achieving the above object, the production method that the present invention takes comprises: converter smelting, LF refining, vacuum refinement, continuous casting, heating, rolling, control is cold, slow cooling, thermal treatment, in described converter smelting, in described converter smelting, tapping carbon 〉=0.06%, tapping P≤0.012%, S≤0.012%; Point blows number of times and must not avoid slag under the tapping process greater than 2 times; In described 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; By II group steel heating, two heating zone temperature are controlled at 1240～1280 ℃, and the soaking zone temperature is controlled at 1220～1260 ℃, heat-up time 9～12min/cm(soaking time＞30min); Described rolling in, start rolling temperature 1000-1150 ℃, adopt high temperature low speed to depress rolling mode greatly, reduction in pass is not less than 15mm, total draft is not less than 60%, stops rolling the steel that dries in the air when temperature is not less than 1000 ℃, the steel thickness that dries in the air is 100-120mm; It is rolling to begin subordinate phase when the rolled piece temperature is 840～880 ℃, and last three percentage pass reductions are 〉=15%, and the accumulative total draft is not less than 60%, finishing temperature: thickness≤50mm by 780～860 ℃ of controls, thickness＞50mm presses 760-840 ℃ of control; In described control is cold, return 620～700 ℃ of red temperature; In described slow cooling, go into burial pit temperature 〉=400 ℃; Cooling in heap time 〉=12 hour, 890～930 ℃ of normalizing temperatures, soaking time 1.6～2.2min/cm.
By 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 9.0～11.0 grades by controlled rolling and controlled cooling, by the above-mentioned effective enforcement that waits measure, successfully produced≤the thick guarantor's flaw detection of 60 mm, protected the Highrise buildings Q420GJD-Z35 steel plate of mechanical property.
Hot metal pretreatment to whole thermal treatment whole process, has been worked out strict process point control standard, and strict the execution, by composition after optimizing and rolling technology are carried out strictness control, make the quality in kind of product reach Q420GJD-Z35 level level.Its yield strength is controlled at 400～480 MPa, and tensile strength is controlled at 540～630 MPa, and yield tensile ratio all≤0.80; Elongation is controlled at 22%-27%;-20 ℃ of V-type ballistic works are controlled at 153～280 J; Z is distributed between 32～57 to performance, and all greater than 40%, performance index have satisfied the Q420GJD-Z35 development requires to 3 Z of individual sample fully to performance mean value.
Description of drawings
Below in conjunction with accompanying drawing, the present invention is further elaborated.
Fig. 1 is the metallographic structure figure (ferrite+perlite 100X) of TMCP of the present invention after rolling.
Embodiment
The guaranteed cost of thickness of the present invention below 60mm, protect the flaw detection Highrise buildings with the Q420GJD-Z35 steel plate comprise following weight percent chemical ingredients (unit, wt%):
C:0.10～0.17, Si:0.20～0.50, Mn:1.20～1.60, P :≤0.015, S :≤0.005, micro alloying element (Nb+V+Ti)≤0. 10, Als :≤0.050, other is Fe and relict element.
The production method that the present invention takes comprises: converter smelting, LF refining, vacuum refinement, continuous casting, heating, rolling, control is cold, slow cooling, thermal treatment, in described converter smelting, in described converter smelting, tapping carbon 〉=0.06%, tapping P≤0.012%, S≤0.012%; Point blows number of times and must not avoid slag under the tapping process greater than 2 times; In described 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; By II group steel heating, two heating zone temperature are controlled at 1240～1280 ℃, and the soaking zone temperature is controlled at 1220～1260 ℃, heat-up time 9～12min/cm(soaking time＞30min); Described rolling in, start rolling temperature 1000-1150 ℃, adopt high temperature low speed to depress rolling mode greatly, reduction in pass is not less than 15mm, total draft is not less than 60%, stops rolling the steel that dries in the air when temperature is not less than 1000 ℃, the steel thickness that dries in the air is 100-120mm; It is rolling to begin subordinate phase when the rolled piece temperature is 840～880 ℃, and last three percentage pass reductions are 〉=15%, and the accumulative total draft is not less than 60%, finishing temperature: thickness≤50mm presses 780-860 ℃ of control, and thickness＞50mm presses 760-840 ℃ of control; In described control is cold, return red temperature 620-700 ℃; In described slow cooling, go into burial pit temperature 〉=400 ℃; Cooling in heap time 〉=12 hour, 890～930 ℃ of normalizing temperatures, soaking time 1.6～2.2min/cm.
Embodiment 1
By converter smelting, LF refining, vacuum refinement, continuous casting, heating, rolling, cold, the slow cooling of control, the Q420GJD-Z35 finished product steel plate chemical ingredients that acquisition is described in table 1 below, wherein each processing parameter and mechanical property are seen as following table 4,5.
The chemical ingredients of table 1 embodiment 1 steel
Embodiment 2
By converter smelting, LF refining, vacuum refinement, cast, heating, rolling, control is cold, slow cooling, thermal treatment, obtains to be described in table 2 below Q420GJD-Z35 finished product steel plate chemical ingredients, wherein each processing parameter and mechanical property are seen as following table 4,5.
The chemical ingredients of table 2 embodiment 2 steel
Technical process of the present invention:
Slow cooling → thermal treatment → surface inspection → 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 → continuous casting → heating → dephosphorization → controlled rolling → controlled chilling → control.
1.1 steel-making part
1.1 .1 composition design
The chemical composition design of steel plate of the present invention adopts low-carbon-equivalent, and Mn-Nb-V-Ti is ferrite+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.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 element content.
1.1.3 converter smelting process point requirement
Control tapping carbon 〉=0.06%, tapping P≤0.012%, S≤0.012% by Clean Steel smelting technology standard; Point blows number of times and must not avoid slag under the tapping process greater than 2 times.
1.1.4 LF refinery practice point requirement
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.
1.1.5 vacuum refining process point requirement
Dwell time under≤67Pa is controlled by 〉=20min; Carry out Ca behind the vacuum breaker immediately and handle, inclusion is carried out modification, soft blow is hung steel after greater than 5min.
1.1.6 continuous casting process point requirement
Adopt the production of 250-300mm section, to guarantee compression ratio, the continuous casting superheating temperature is controlled at 10-20 ℃, adopts low pulling rate.
1.2 steel rolling process point control requirement
1.2.1 heating process point
Adopt the two-stage heating, heating zone temperature＜1000 ℃, two heating zone temperature are controlled at 1220～1260 ℃, and the soaking zone temperature is controlled at 1200～1240 ℃.
1.2.2 rolling technology
Adopt two stage rolling, 1000 ℃～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, working roll rolling line speed is by≤1.5m/s control; Cool steel thickness is 100-120mm, it is rolling to begin subordinate phase when the rolled piece temperature is 840～880 ℃, and last three percentage pass reductions are 〉=15%, and the accumulative total draft is not less than 60%, finishing temperature: thickness≤50mm presses 780-860 ℃ of control, and thickness＞50mm presses 760-840 ℃ of control; In described control is cold, return red temperature 620-700 ℃; In described slow cooling, go into burial pit temperature 〉=400 ℃; Cooling in heap time 〉=12 hour, 890～930 ℃ of normalizing temperatures, soaking time 1.6～2.2min/cm.
1.2.3 cooling control technology
It is weak cold to enter twice of ACC after rolling, reduces the surface and the inner temperature difference as far as possible, guarantees to return red temperature at 620-680 ℃, is sent to powerful straightener after the cooling and carries out hot straightening.
1.2.4 retarded cooling process
Carry out slow cooling after steel plate rolls off the production line, go into burial pit temperature 〉=400 ℃; Cooling in heap time 〉=12 hour.
1.2.5 thermal treatment
Execution technology is holding temperature: 890-930 ℃; Heat-up time: 1.6-2.2min/mm.
2.1 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; 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 Q420GJD-Z35 steel plate for tall building.
2.1.1 surface quality requires to press the strict execution of GB/T714-2008.
2.1.2 flaw detection is carried out JB/T2970-2004 II level non-destructive testing standard and is carried out.
2.1.3 composition and mechanical mechanics property are pressed GB/T19879-2008 and are carried out, and specifically see Table 4.
Table 4 Q420GJD-Z35 steel plate mechanical mechanics property
This produces totally 57 crowdes of the thick Q420GJD-Z35 of 60mm altogether as a trial, and wherein: yield strength is controlled at 420～530 MPa, and tensile strength is controlled at 540～680 MPa, and yield tensile ratio all≤0.82; Elongation is controlled at 21%-26%;-20 ℃ of V-type ballistic works are controlled at 153-280J; Z is distributed between the 32-57 to performance, and all greater than 40%, performance index have satisfied the Q420GJD-Z35 development requires to 3 Z of individual sample fully to performance mean value.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 136～220 J.The result shows that the thick Q420GJD-Z35 steel plate for tall building of the 60mm of this exploitation has reached the performance class of the thick Q420GJE-Z35 of 60mm.
2.3 examine outward and detect a flaw
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 unification level rate is 100%, has reached desired result.
2.4 metallographic examination
Table 5 metallographic structure
Associative list 5 and Fig. 2 analysis, the steel plate after rolling is organized as ferrite and perlite, and grain fineness number reaches 9.0～10.0 grades.
Claims (2)
1. one kind≤60mm Highrise buildings Q420GJD-Z35 steel plate, this steel plate comprise following chemical components in mass percent (unit, wt%):
C:0.10～0.17, Si:0.20～0.50, Mn:1.20～1.60, P :≤0.015, S :≤0.005, micro alloying element (Nb+V+Ti)≤0. 10, Als :≤0.050, other is Fe and relict element.
One kind according to claim 1≤the 60mm Highrise buildings is with the production method of Q420GJD-Z35 steel plate, this production method comprises: converter smelting, LF refining, vacuum refinement, continuous casting, heating, rolling, control is cold, slow cooling, thermal treatment, it is characterized in that in described converter smelting, in described converter smelting, tapping carbon 〉=0.06%, tapping P≤0.012%, S≤0.012%; Point blows number of times and must not avoid slag under the tapping process greater than 2 times; In described 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; By II group steel heating, two heating zone temperature are controlled at 1240～1280 ℃, and the soaking zone temperature is controlled at 1220～1260 ℃, heat-up time 9～12min/cm; Described rolling in, start rolling temperature 1000-1150 ℃, adopt high temperature low speed to depress rolling mode greatly, reduction in pass is not less than 15mm, total draft is not less than 60%, stops rolling the steel that dries in the air when temperature is not less than 1000 ℃, the steel thickness that dries in the air is 100-120mm; It is rolling to begin subordinate phase when the rolled piece temperature is 840～880 ℃, and last three percentage pass reductions are 〉=15%, and the accumulative total draft is not less than 60%, finishing temperature: thickness≤50mm by 780～860 ℃ of controls, thickness＞50mm presses 760-840 ℃ of control; In described control is cold, return 620～700 ℃ of red temperature; In described slow cooling, go into burial pit temperature 〉=400 ℃; Cooling in heap time 〉=12 hour, 890～930 ℃ of normalizing temperatures, soaking time 1.6～2.2min/cm.
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| CN110629002A (en) * | 2019-10-17 | 2019-12-31 | 山东钢铁集团日照有限公司 | Method for producing low-compression-ratio lamellar tearing-resistant extra-thick plate based on TMCP (thermal mechanical control processing) |
| CN112921248A (en) * | 2021-02-08 | 2021-06-08 | 新疆八一钢铁股份有限公司 | Production method of high-toughness anti-layer-tearing Z-direction steel with thickness of 50mm |
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Application publication date: 20110504 |