CN102051522A - Steel plate made of bainite structure high-strength toughness structural steel Q550D(E) and production method thereof - Google Patents
Steel plate made of bainite structure high-strength toughness structural steel Q550D(E) and production method thereof Download PDFInfo
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- 239000010959 steel Substances 0.000 title claims abstract description 79
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 229910001563 bainite Inorganic materials 0.000 title claims abstract description 7
- 229910000746 Structural steel Inorganic materials 0.000 title abstract description 10
- 238000005096 rolling process Methods 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000010583 slow cooling Methods 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 238000003723 Smelting Methods 0.000 claims abstract description 13
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- 238000007670 refining Methods 0.000 claims abstract description 12
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- 229910052751 metal Inorganic materials 0.000 claims description 9
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- 229910052698 phosphorus Inorganic materials 0.000 abstract description 2
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- 238000009847 ladle furnace Methods 0.000 abstract 2
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- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical group [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a steel plate made of bainite structure high-strength toughness structural steel Q550D(E) and a production method thereof. The steel plate comprises the following chemical ingredients in percentage by mass: 0.05-0.15 percent of C, 0.10-0.40 percent of Si, 1.40-1.65 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.30 percent of micro alloying element (V+Nb+Ti+Mo+B), less than or equal to 0.050 percent of Als and the balance of Fe and residual elements. The production method comprises the following steps of: pretreating molten iron; smelting in a converter; refining in an LF (Ladle Furnace); carrying out VD (Vacuum Degassing); carrying out continuous steel casting; heating; carrying out TMCP (Thermo Mechanical Control Process) rolling; controlling cold; and stacking for slow cooling. In the invention, in the rectifying and reforming processes from molten steel treatment to steel plate stacking for slow cooling and rectification, a strict process point control standard is formulated and executed, thus the mass quality of a product is good, and the margin performance is larger, wherein the yield margin is 50-100MPa, the tensile margin is 30-60MPa, the elongation margin is 2-4 percent, and the impact property reaches the level of -60 DEG C; and the TMCP process is adopted for producing qualified products at a time without quenching and tempering, thus the production cost is greatly reduced.
Description
Technical field
The present invention relates to steel, be specifically related to a kind of bainite structure high-strong toughness structure iron Q550D(E) steel plate and production method thereof.
Background technology
High Strength Structural Steel Q550D(E) be a kind of low-alloy high-tensile structural steel, it has characteristics such as intensity height, good toughness, excellent in low temperature toughness, processing characteristics and good welding performance.Be mainly used in fields such as engineering machinery, coal mine machinery, shipbuilding and steel construction.In recent years, the application of Hi-Stren steel is more extensive, and domestic had a large amount of research to this.But reason production costs such as high strength Q550D(E) steel plate is big with its production difficulty, the tooling requirement is special are high, the domestic part employing TMCP+RPC+T of steel mill produces, complex procedures, also have the part steel to deliver goods with quality adjustment condition, steel plate is through quenching and tempering twice heat treatment step, not only strict to Equipment for Heating Processing, increased manufacturing cycle and production cost especially.
Summary of the invention
At the problems referred to above, grope through the contriver, obtained a kind of employing TMCP explained hereafter and made low-alloy high-tensile structural steel Q550D(E) steel plate, thereby finished the present invention.
Therefore, the object of the present invention is to provide a kind of thickness at 12-40mm low-alloy high-tensile structural steel Q550D(E) steel plate.
Another object of the present invention is to provide the production method of this steel plate.
For achieving the above object, the technical scheme that the present invention takes is thickness at the guaranteed cost of 12-40mm, protects flaw detection High Strength Structural Steel Q550D(E) steel plate comprise following chemical components in mass percent (unit, wt%):
C:0.05～0.15, Si:0.10～0.40, Mn:1.40～1.65, P :≤0.010, S :≤0.005, micro alloying element (V+Nb+Ti+Mo+B) :≤0.30, Als :≤0.050, other is Fe and relict element.
Carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] :≤0.30.
The function analysis of above-mentioned chemical element is as follows:
C: be most basic strengthening element in the steel, can form compound with microalloy element Nb, V etc. and improve intensity, but C influence the welding property and the property of steel.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.
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.
Mo: the effect of solution strengthening is played in an amount of adding, can effectively reduce γ → α transformation rate, suppress polygonal ferrite and perlite forming core, promote the acicular ferrite or the microtexture ULCB forming core of high density dislocation substructure, guarantee the steel plate high-intensity high-tenacity.
Al: can play the crystal grain thinning strengthening effect.
B: form Nb(B) class precipitate with Nb in the steel, after thermal distortion, in austenite, on dislocation line, separate out by strain inducing, hinder recrystallize, improve recrystallization temperature, the B atom greatly hinders cenotype at crystal boundary place forming core in the inclined to one side party of crystal boundary, makes proeutectoid ferrite generate the district and obviously moves to right.
Described low-alloy high-tensile structural steel Q550D(E) steel plate thickness is at 12-40mm, Ceq＜0.42, Pcm＜0.21.
For achieving the above object, the production method that the present invention takes comprises: hot metal pretreatment, converter smelting, LF refining, VD vacuum refinement, continuous casting steel machine, heating, TMCP is rolling, control is cold, stacking slow cooling, in described converter smelting, tapping carbon 0.03～0.04%, 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 described LF refining, take the big quantity of slag to carry out slag making, guarantee that the white slag sludging time is controlled in the 15min, avoid the rare phenomenon of slag to take place; In described vacuum refinement, the dwell time under≤67Pa is controlled by 〉=20min; Pine in described adding, the holding temperature of process furnace is controlled at 1200 ℃～1220 ℃; Described rolling in, 1020 ℃～1120 ℃ of start rolling temperatures; One stage finishing temperature is at 950 ℃～1000 ℃, and the two-stage start rolling temperature is at 880～920 ℃, and the two-stage takes to depress for a short time rolling, to guarantee original plate shape, 800～860 ℃ of finishing temperatures; In described control is cold, return 560～600 ℃ of red temperature, cooling rate is controlled at 10～15 ℃/s; In described slow cooling, go into burial pit temperature 〉=300 ℃; Cooling in heap time 〉=24 hour.
By reasonably taking the chemical composition design of the composite micro-alloyed element of the low many units of manganese ﹑ of low carbon ﹑, 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 11～12 grades by controlled rolling and controlled cooling+normalizing treatment, by the above-mentioned effective enforcement that waits measure, successfully produced guaranteed cost, the guarantor's flaw detection High Strength Structural Steel Q550D(E of 12～40mm) steel plate.
Hot metal pretreatment is rectified and improved process to the steel plate stacking slow cooling, worked out strict process point control standard, and strict the execution, the quality in kind of product is good, the performance surplus capacity is bigger, wherein surrenders surplus capacity at 50～100Mpa, and the tension surplus capacity is at 30～60Mpa, the elongation surplus capacity is 2～4%, and impact property has reached-60 ℃ of levels.It is qualified to adopt TMCP technology once to produce, and need not carry out tempering or modifier treatment, has reduced production cost greatly.
Description of drawings
Below in conjunction with accompanying drawing, the present invention is further elaborated.
Fig. 1 is the metallographic structure figure (200X) of TMCP of the present invention after rolling.
Embodiment
Thickness of the present invention is at the low-alloy high-tensile structural steel Q550D(E of 12-40mm) steel plate comprise following chemical components in mass percent (unit, wt%):
C:0.05～0.15, Si:0.10～0.40, Mn:1.40～1.65, P :≤0.010, S :≤0.005, micro alloying element (V+Nb+Ti+Mo+B) :≤0.30, Als :≤0.050, other is Fe and relict element.
Carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] :≤0.30.
The production method that the present invention takes comprises: hot metal pretreatment, converter smelting, LF refining, VD vacuum refinement, continuous casting steel machine, heating, TMCP is rolling, control is cold, stacking slow cooling, in described converter smelting, tapping carbon 0.03～0.04%, 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 described LF refining, take the big quantity of slag to carry out slag making, guarantee that the white slag sludging time is controlled in the 15min, avoid the rare phenomenon of slag to take place; In described vacuum refinement, the dwell time under≤67Pa is controlled by 〉=20min; Pine in described adding, the holding temperature of process furnace is controlled at 1200 ℃～1220 ℃; Described rolling in, 1020 ℃～1120 ℃ of start rolling temperatures; One stage finishing temperature is at 950 ℃～1000 ℃, and the two-stage start rolling temperature is at 880～920 ℃, and the two-stage takes to depress for a short time rolling, to guarantee original plate shape, 800～860 ℃ of finishing temperatures; In described control is cold, return 560～600 ℃ of red temperature, cooling rate is controlled at 10～15 ℃/s; In described slow cooling, go into burial pit temperature 〉=300 ℃; Cooling in heap time 〉=24 hour.
Embodiment 1
By hot metal pretreatment, converter smelting, LF refining, VD vacuum refinement, continuous casting steel machine, heating, TMCP is rolling, control is cold, stacking slow cooling technology, obtain Q550D (E) the finished product steel plate of chemical ingredients as described in Table 1, wherein each processing parameter and mechanical property see the following form 4,5.
Table 1 embodiment 1 steel chemical composition
Embodiment 2
By hot metal pretreatment, converter smelting, LF refining, VD vacuum refinement, continuous casting steel machine, heating, TMCP is rolling, control is cold, stacking slow cooling technology, obtain Q550D (E) the finished product steel plate of chemical ingredients as described in Table 1, wherein each processing parameter and mechanical property see the following form 4,5.
The chemical ingredients of table 2 embodiment 2 steel
Embodiment 3
By hot metal pretreatment, converter smelting, LF refining, VD vacuum refinement, continuous casting steel machine, heating, TMCP is rolling, control is cold, stacking slow cooling technology, obtain Q550D (E) the finished product steel plate of chemical ingredients as described in Table 1, wherein each processing parameter and mechanical property see the following form 4,5.
The chemical ingredients of table 3 embodiment 3 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 → surface inspection → finishing → flaw detection → service check → salable product warehouse-in.
1.1 steel-making part
1.1.1 composition design
Because the demanding yield strength of this steel plate guarantees that yield strength, tensile strength and elongation, the ballistic work of steel plate is difficult point and emphasis, must take all factors into consideration in the composition design, just can reach the unification of intensity and plasticity and toughness.Consider that the ferritic-pearlitic steel is difficult to reach the impelling strength requirement of other intensity of 550Mpa level and-40 ℃ 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, by 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 element content in the steel of keeping under strict control.
1.1.2 KR hot metal pretreatment technology point requirement
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 ℃.
1.1.3 converter smelting process point requirement
Control according to the Melting Process for Low Carbon Steel standard, tapping C is controlled at 0.03-0.05%, and tapping P≤0.012% is avoided slag under the tapping process.
1.1.4 LF refinery practice point requirement
Adopt big quantity of slag technology to carry out slag making operation, guarantee that the white slag hold-time is controlled at more than the 18min, stop the shoddye phenomenon; Carry out the Argon operation in strict accordance with the Argon standard, forbid blowing cruelly.
1.1.5 VD vacuum refining process point requirement
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.
1.1.6 continuous casting process point requirement
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, 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.
1.1.7 strand management
Going into special-purpose burial pit after the strand cutting is rolled off the production line carries out more than the slow cooling 24h.
1.2 steel rolling process point control requirement
[0057] 1.2.1 heating process point requirement
The strand heating is controlled in strict accordance with III group steel heating process,, maximum heating temperature is 1240 ℃.
1.2.2 rolling technology point requirement
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, permeate for guaranteeing distortion,, 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 ℃.
1.2.3 cooling control technology point requirement
Go into ACC after steel plate rolls and cool off fast, 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.
1.2.4 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 is not less than 24 hours;
[2.1 chemical ingredientss
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 steel plate welding property excellence; 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 1.60%.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 0.10～0.15.It is stable austenite that the adding of Mo, B mainly acts on, and suppresses polygonal ferrite and compares with perlite, promotes bainite to compare, and add-on is controlled between 0.15～0.25.P, S content are controlled in the lower scope, guarantee the clean inclusion-free of steel plate.Satisfy the composition design requirements of Q550D ultra-thick plate.
2.1.1 surface quality requires to press the strict execution of GB/T709-2008;
2.1.2 flaw detection is carried out JB/T2970-2004 III level non-destructive testing standard and is carried out;
2.1.3 composition and mechanical mechanics property are pressed GB/T1591-2008 and are carried out, and specifically see Table 4.
Table 4 Q550D(E) steel plate mechanical mechanics property
This produces the thick Q550D(E of 25mm altogether as a trial) 30 batches, the thick Q550D(E of 30mm) 20 batches, 40mmQ550D(E) 10 batches wherein: yield strength is controlled at 540～680 MPa, has on average reached 600 MPa, than the rich 70MPa of standard; Tensile strength is controlled at 680～810 MPa, has on average reached 750 MPa, than the rich 80MPa of standard; Elongation is controlled at 17%-30%, on average reaches 18%, than standard affluence 2%;-20 ℃ of V-type ballistic works are controlled at 90～320 J, have on average reached 200 J, and performance index have satisfied Q550D(E fully) development requires.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 reaches 90～280 J, has on average reached 180 J.The result shows, the 25mm of this exploitation, 30mm, 40mm thickness Q550D(E) requirement of low-alloy high-strength plate conformance with standard.
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 60%, and closing three grades of rates is 100%, has reached desired result.
2.4 metallographic examination
Metallographic examination is carried out in the sampling of product thickness 1/4 place, be the results are shown in Figure 1.
Table 5 product metallographic examination result
Associative list 5 and Fig. 1 analysis, steel plate inclusion summation are rolled the back steel plate and are organized as B less than 2.5, and grain fineness number reaches 12～12.5 grades.
Claims (2)
1. steel plate bainite structure high-strong toughness structure iron Q550D(E), this steel plate comprise following chemical components in mass percent (unit, wt%):
C:0.05～0.15, Si:0.10～0.40, Mn:1.40～1.65, P :≤0.010, S :≤0.005, micro alloying element (V+Nb+Ti+Mo+B) :≤0.30, Als :≤0.050, other is Fe and relict element.
2. the production method of steel plate bainite structure high-strong toughness structure iron Q550D(E according to claim 1), this method comprises: hot metal pretreatment, converter smelting, LF refining, VD vacuum refinement, continuous casting steel machine, heating, TMCP is rolling, control is cold, stacking slow cooling; It is characterized in that in described converter smelting tapping carbon 0.03～0.04%, 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 described LF refining, take the big quantity of slag to carry out slag making, guarantee that the white slag sludging time is controlled in the 15min, avoid the rare phenomenon of slag to take place; In described vacuum refinement, the dwell time under≤67Pa is controlled by 〉=20min; Pine in described adding, the holding temperature of process furnace is controlled at 1200 ℃～1220 ℃; Described rolling in, 1020 ℃～1120 ℃ of start rolling temperatures; One stage finishing temperature is at 950 ℃～1000 ℃, and the two-stage start rolling temperature is at 880～920 ℃, and the two-stage takes to depress for a short time rolling, to guarantee original plate shape, 800～860 ℃ of finishing temperatures; In described control is cold, return 560～600 ℃ of red temperature, cooling rate is controlled at 10～15 ℃/s; In described slow cooling, go into burial pit temperature 〉=300 ℃; Cooling in heap time 〉=24 hour.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105976572A CN102051522A (en) | 2010-12-21 | 2010-12-21 | Steel plate made of bainite structure high-strength toughness structural steel Q550D(E) and production method thereof |
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| CN102345059A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | High strength low alloy structural normalizing A633GRD steel plate and production method thereof |
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| CN102345044A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | Q420GJE-Z35 steel plate used for high grade high-rise building and its production method |
| CN102367543A (en) * | 2011-06-28 | 2012-03-07 | 南阳汉冶特钢有限公司 | Boron steel ASTMA36-B medium and heavy plate and production process thereof |
| CN102367545A (en) * | 2011-06-28 | 2012-03-07 | 南阳汉冶特钢有限公司 | A572Gr50 boron-added-steel steel plate and production method thereof |
| CN102433498A (en) * | 2011-06-29 | 2012-05-02 | 南阳汉冶特钢有限公司 | Q550 D high-quality structural iron medium and heavy plate and production method thereof |
| CN102634727A (en) * | 2012-04-23 | 2012-08-15 | 武汉钢铁(集团)公司 | High-toughness steel for engineering machine and production method thereof by using TMCP (Thermal Mechanical Control Processing) |
| CN103725975A (en) * | 2013-12-30 | 2014-04-16 | 南阳汉冶特钢有限公司 | Novel low-cost high-strength Q500 series steel plate and production method thereof |
| CN103725857A (en) * | 2013-12-27 | 2014-04-16 | 内蒙古包钢钢联股份有限公司 | Method for improving strength of Q550D steel plate |
| CN104004892A (en) * | 2014-06-18 | 2014-08-27 | 济钢集团有限公司 | 70 kg-class TMCP type high-strength steel and method for manufacturing extend rate detection samples thereof |
| CN104313280A (en) * | 2014-07-21 | 2015-01-28 | 中北大学 | Preparation method for Mn-Ti low-carbon steel through TMCP production |
| CN108704951A (en) * | 2018-05-10 | 2018-10-26 | 舞阳钢铁有限责任公司 | A kind of production method of large-scale steel ingot rolling super thick ultra-wide steel plate |
| CN109706386A (en) * | 2018-11-06 | 2019-05-03 | 东北大学 | A kind of low compression ratio Q550D steel plate for construction machinery and its production method |
| CN110218956A (en) * | 2019-05-23 | 2019-09-10 | 江苏永钢集团有限公司 | One kind is directly cut with low-carbon bainite non-hardened and tempered steel and its production method |
| CN110846575A (en) * | 2019-11-15 | 2020-02-28 | 南京钢铁股份有限公司 | High-end passenger ship-crossing steel with thickness of less than 12mm and manufacturing method thereof |
| CN110983184A (en) * | 2019-12-17 | 2020-04-10 | 邯郸钢铁集团有限责任公司 | Low-carbon TMCP state ship plate steel and production method thereof |
| CN113604737A (en) * | 2021-07-30 | 2021-11-05 | 山东钢铁股份有限公司 | Q550D high-strength steel plate and preparation method thereof |
| WO2024120001A1 (en) * | 2022-12-06 | 2024-06-13 | 南阳汉冶特钢有限公司 | Low-cost q550d steel plate with mo replaced with v, and production method therefor |
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| CN102345061A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | Q690D quality structural medium steel plate and production method thereof |
| CN102345044A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | Q420GJE-Z35 steel plate used for high grade high-rise building and its production method |
| CN102367543A (en) * | 2011-06-28 | 2012-03-07 | 南阳汉冶特钢有限公司 | Boron steel ASTMA36-B medium and heavy plate and production process thereof |
| CN102367545A (en) * | 2011-06-28 | 2012-03-07 | 南阳汉冶特钢有限公司 | A572Gr50 boron-added-steel steel plate and production method thereof |
| CN102345059A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | High strength low alloy structural normalizing A633GRD steel plate and production method thereof |
| CN102433498B (en) * | 2011-06-29 | 2013-11-20 | 南阳汉冶特钢有限公司 | Q550 D high-quality structural iron medium and heavy plate and production method thereof |
| CN102433498A (en) * | 2011-06-29 | 2012-05-02 | 南阳汉冶特钢有限公司 | Q550 D high-quality structural iron medium and heavy plate and production method thereof |
| CN102634727B (en) * | 2012-04-23 | 2014-05-14 | 武汉钢铁(集团)公司 | High-toughness steel for engineering machine and production method thereof by using TMCP (Thermal Mechanical Control Processing) |
| CN102634727A (en) * | 2012-04-23 | 2012-08-15 | 武汉钢铁(集团)公司 | High-toughness steel for engineering machine and production method thereof by using TMCP (Thermal Mechanical Control Processing) |
| CN103725857A (en) * | 2013-12-27 | 2014-04-16 | 内蒙古包钢钢联股份有限公司 | Method for improving strength of Q550D steel plate |
| CN103725975A (en) * | 2013-12-30 | 2014-04-16 | 南阳汉冶特钢有限公司 | Novel low-cost high-strength Q500 series steel plate and production method thereof |
| CN104004892A (en) * | 2014-06-18 | 2014-08-27 | 济钢集团有限公司 | 70 kg-class TMCP type high-strength steel and method for manufacturing extend rate detection samples thereof |
| CN104313280A (en) * | 2014-07-21 | 2015-01-28 | 中北大学 | Preparation method for Mn-Ti low-carbon steel through TMCP production |
| CN108704951A (en) * | 2018-05-10 | 2018-10-26 | 舞阳钢铁有限责任公司 | A kind of production method of large-scale steel ingot rolling super thick ultra-wide steel plate |
| CN109706386A (en) * | 2018-11-06 | 2019-05-03 | 东北大学 | A kind of low compression ratio Q550D steel plate for construction machinery and its production method |
| CN110218956A (en) * | 2019-05-23 | 2019-09-10 | 江苏永钢集团有限公司 | One kind is directly cut with low-carbon bainite non-hardened and tempered steel and its production method |
| CN110846575A (en) * | 2019-11-15 | 2020-02-28 | 南京钢铁股份有限公司 | High-end passenger ship-crossing steel with thickness of less than 12mm and manufacturing method thereof |
| CN110983184A (en) * | 2019-12-17 | 2020-04-10 | 邯郸钢铁集团有限责任公司 | Low-carbon TMCP state ship plate steel and production method thereof |
| CN113604737A (en) * | 2021-07-30 | 2021-11-05 | 山东钢铁股份有限公司 | Q550D high-strength steel plate and preparation method thereof |
| WO2024120001A1 (en) * | 2022-12-06 | 2024-06-13 | 南阳汉冶特钢有限公司 | Low-cost q550d steel plate with mo replaced with v, and production method therefor |
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Application publication date: 20110511 |