CN102605241A - Normalizing type 16MnDR low temperature pressure vessel steel plate and manufacturing method thereof - Google Patents
Normalizing type 16MnDR low temperature pressure vessel steel plate and manufacturing method thereof Download PDFInfo
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- CN102605241A CN102605241A CN2011104620847A CN201110462084A CN102605241A CN 102605241 A CN102605241 A CN 102605241A CN 2011104620847 A CN2011104620847 A CN 2011104620847A CN 201110462084 A CN201110462084 A CN 201110462084A CN 102605241 A CN102605241 A CN 102605241A
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Abstract
The invention relates to a normalizing type 16MnDR low temperature pressure vessel steel plate and a manufacturing method thereof. The steel plate is composed of the following chemical components in percentage by weight: 0.15-0.17% of C, 0.25-0.40% of Si, 1.40-1.55% of Mn, P <= 0.015%, S <= 0.005%, 0.05-0.07% of V, 0.020-0.030% of Als, O <= 0.0040%, N <=0060%, and the balance of the steel plate is Fe and inevitable impurities. The manufacturing method comprises the following steps of: carrying out desulfuration pretreatment on molten iron and steel scrap for being used as raw materials, and carrying out smelting, continuous casting, heating, rolling and cooling, normalizing heat treatment processes and the like to obtain the normalizing type 16MnDR low temperature pressure vessel steel plate. The normalizing type 16MnDR low temperature pressure vessel steel plate provided by the invention has the advantages of favorable strength and plasticity matching, excellent low-temperature impact toughness, lower manufacturing cost, and controllable specification; and the steel plate is mainly used for the manufacture field of low temperature pressure vessel equipment.
Description
Technical field
The present invention relates to a kind of low-temperature pressure vessel steel of field of metallurgy, particularly a kind of normalizing type 16MnDR low-temperature pressure vessel steel plate and method of manufacture thereof.
Background technology
Pressurized vessel is widely used in departments such as chemical industry, oil, machinery, power, metallurgy, nuclear energy, Aeronautics and Astronautics, ocean.It is a requisite nucleus equipment in the Industrial processes, is the important symbol of country's equipment manufacture level.Steel plate of pressure vessel is one big type of special-purpose high technology content in the plate, high value added product.Be used to store, transport the steels for pressure vessel use of cryogenic liquids such as oxygen, LPG liquefied petroleum gas, natural gas liquids, not only require steel plate to have good strong plasticity ability, the special demands steel plate has good low-temperature impact toughness.
The domestic pressure container is following with steel and method of manufacture thereof at present:
Chinese patent CN102041448A discloses " a kind of little vanadium titanium Combined Processing boiler and steels for pressure vessel use and method of manufacture thereof ", and chemical ingredients is: C:0.12～0.20%, Si:0.20～0.50%; Mn:1.20～1.60%, P≤0.020%, S≤0.010%; Als:0.020～0.050%; V:0.010～0.025%, Ti:0.010～0.025%, all the other are Fe and unavoidable impurities.ME is: molten iron pretreatment desulfurizing, converter smelting, the refining of LF stove or the refining of CAS stove, continuous casting, slab heating, hot continuous rolling, open flat aligning.Advantage is; The Q345R that chemical ingredients that provides according to this invention and method of manufacture thereof are produced opens plain plate and compares with the rolling same specification Q345R steel plate of plate mill; Chemical composition stability, various performances are even, and metallurgical quality and surface quality are good; Plate shape and size control precision are high, and product percent of pass and lumber recovery are high.
Chinese patent CN102002630A discloses a kind of " anti-HIC steels for pressure vessel use Q345R-Z35 special heavy plate and working method thereof ", and the chemical ingredients mass percent is: C :≤0.20, Si :≤0.55, Mn:1.20～1.60, P :≤0.025, S :≤0.005, micro alloying element :≤0.10,
Als:>=0.015, other is Fe and relict element.Its working method of taking may further comprise the steps: technologies such as molten iron KR desulfurization, converter smelting, LF are concise, VD vacuum outgas, die casting cast, steel ingot heating, rolling, ACC cooling, aligning, steel plate cooling in heap, normalizing thermal treatment; This invention is through reasonable component design, Process Route; Developed special thick steel heavy plate for pressure vessels, detected result shows that one-level flaw detection qualification rate, performance initial test qualification rate all reach 100%; Anti-in addition lamellar tearing performance reaches the Z35 rank, and anti-hydrogen induced cracking detected result is excellent.
Chinese patent CN101787490A discloses " a kind of Q345R steel of microalloying ", and the Q345R steel of 170 and 210 sections adds Ti:0.018～0.035 by weight; The Q345R steel of 240 sections adds Ti:0.018～0.035 by weight, V:0.020～0.030, the Q345R steel plate of after above-mentioned microalloying is handled, producing; According to the requirement of GB713-2008 " Steel Plates For Boiler And Pressure Vessels ", final over-all properties qualification rate is 97.06%, and the unusual qualification rate of deduction fracture is 98.40%; The properties percent of pass of carrying out preceding 16MnR steel 99% with new national standard is approaching; Wherein, the hot rolling properties percent of pass is 95.91%, and the unusual qualification rate of deduction fracture is 98.06%; The normalizing properties percent of pass is 98.58%, all than the Q345R steel plate qualification rate that adopts prior art to produce remarkable lifting is arranged.
Chinese patent CN101082104A discloses " a kind of nickel-free micro-alloy low-temperature pressure vessel steel and method of manufacture thereof "; Composition quality per-cent is: C 0.04～0.08, Si＜0.6, Mn 1.0～1.6, Nb 0.010～0.030, Ti 0.005～0.030, V＜0.070%, Al 0.004～0.060, N＜0.008, P＜0.015, S＜0.010, all the other are Fe and inevitable impurity.Adopt the rolling method of TMCP to make the ys of steel plate reach more than the 360MPa, tensile strength surpasses 490MPa, and low-temperature impact toughness satisfies-60 ℃ requirement (ballistic work that promptly satisfies-60 ℃ is not less than 41J), and has good plasticity and weldableness.Because of not adding noble metal Ni, Mo, and adopt the rolling replacement modifier treatment of TMCP, can reduce production costs and shorten the manufacturing cycle.
Chinese patent CN101871077A discloses " a kind of normalizing type high-strength pressure vessel steel and method of manufacture thereof "; Chemical component weight per-cent is: C:0.12～0.18%, Si:0.15～0.40%, Mn:1.20～1.70%, P≤0.020%, S≤0.015%, Ni:0.10～0.40%, Nb:0.01～0.05%, Ti:0.01～0.03%, Als:0.015～0.050%; Include in V≤0.20%, Cu≤0.70% one or both simultaneously, all the other are Fe and unavoidable impurities.Utilize the specification of single roll process control steel plate, through after the controlled rolling, adopt 840～920 ℃ of normalizing temperatures, the normalizing process of soaking time 30～40min+t * 1min/mm has obtained uniform ferritic and pearlitic structure.Steel plate has good intensity, plasticity, toughness and welding property.
Chinese patent CN101713044A discloses " a kind of Q370R steels for pressure vessel use and preparation method thereof "; Chemical component weight per-cent is: C:0.14～0.18%, Si:0.25～0.50%, Mn:1.45～1.60%; P≤0.020%; S≤0.015%, Nd:0.28～0.45%, surplus is Fe and unavoidable impurities.A kind of preparation method of Q370R steels for pressure vessel use is also disclosed simultaneously.Q370R steels for pressure vessel use of the present invention has been optimized set of dispense ratio and thermal treatment process, on the basis of tensile strength and ys conformance with standard GB713-2008; Improved low-temperature impact toughness; Greater than 200J, reach as high as 304J at-27 ℃ of ballistic works, be higher than 7.5 times of national standard lower limits; And the performance parameter variations of tensile strength, ys, unit elongation and impelling strength after having carried out the simulation welding is little, has therefore improved the welding property of Q370R.
Summary of the invention
The purpose of this invention is to provide the good strong plasticity coupling of stipulating among a kind of GB3531-2008 of meeting " low-temperature pressure container is used Low Alloy Steel Plate " that has; Good low-temperature impact toughness; And production cost is lower; Normalizing type 16MnDR low-temperature pressure vessel steel plate and method of manufacture thereof that specification is controlled, this steel plate is mainly used in the manufacturing of low-temperature pressure container equipment.
Technical scheme of the present invention is:
The chemical ingredients of steel plate of the present invention is C:0.15～0.17%, Si:0.25～0.40%, Mn:1.40～1.55%, P by weight percentage: S≤0.015% :≤0.005%, V:0.05～0.07%, Als:0.020～0.030%; O: N≤0.0060%≤0.0040%,, surplus are Fe and unavoidable impurities.
Main alloy element and the effect of content in steel of the present invention thereof that the present invention selects are following:
Carbon (C): carbon produces remarkably influenced to intensity, low-temperature impact toughness, the welding property of steel.The every increase by 0.1% of carbon content, tensile strength approximately improves 90MPa, and ys approximately improves 40～50MPa.Carbon content is crossed the low NbC growing amount that can make and is reduced, and influences the controlled rolling effect, also can increase and smelt the control difficulty, and carbon content is too high, and the turnout of bainite in the steel process of cooling is reduced, and also the phenomenon of hardening can occur at welded heat affecting zone.When carbon content is in being not more than 0.18% scope in the steel, not only can improves the intensity of steel but also be fit to production operation, improve its suitability and feasibility in big production.Therefore, the best carbon content of the present invention's setting is 0.15～0.17%.
Silicon (Si): silicone content is controlled at 0.25～0.40% among the present invention, and Si can reduce the greying tendency of carbon in the steel, mainly improves the intensity of steel with the solution strengthening form, surpasses at 0.5% o'clock, can cause the toughness of steel to descend.
Manganese (Mn): manganese content is controlled at 1.40～1.55% among the present invention, manganese with low cost, and its solution strengthening effect meeting is risen the tensile strength of steel significantly, and the intensity that improves low-carbon (LC) and middle carbon perlitic steel is had significant effect.Contain 1% Mn and can improve tensile strength 100MPa approximately.In addition, Mn can also improve the solubleness in steel such as Nb, V.But Mn has the effect that promotes grain growth, to overheated responsive.
P and s (P, S): because P, S content in the steel must be controlled at lower scope, have only the smelting Clean Steel, could guarantee the performance of steel of the present invention.Steel P content of the present invention is controlled at below 0.015%, and S content is controlled at below 0.005%..
Vanadium (V): V is an intensive carbonitride forming element, and it stops austenite crystal to be grown up and crystal grain thinning through forming carbide, improves the normal temperature and the hot strength of steel.V can promote pearlitic formation, can also the refinement ferrite lath.In normalized steel, V often adds with Nb, Ti etc., and through adding the effect that Nb and Ti reach crystal grain thinning, and the deposition through V separates out and gains in strength.V can make the intensity of steel increase more than the 150MPa.But during the V too high levels, precipitate quantity increases, and size increases, thereby causes the toughness of steel to reduce.Steel V content of the present invention is controlled at 0.05～0.07%.
Als: i.e. aluminium is dissolved in acid, is meant and can be comprised AlN and solid solution aluminium by sour dissolved aluminium, and it can be used as the index of weighing aluminium content in the steel.In the steel-smelting production process in order to reduce the oxygen level in the steel; Deoxidation materials (or its composite alloy) such as aluminium commonly used, barium, calcium, silicon, manganese react into oxygen and float to the oxygen level in the aspect reduction steel on the molten steel on the oxide compound slag; Wherein aluminium is good reductor, and aluminium is prone to generate Al with the oxygen reaction
2O
3And the AlN of minute quantity, there is the solid solution of part pure aluminum to go into simultaneously and forms solid solution aluminium in the steel.Aluminium adds in the steel as deoxidation and crystal grain adjustment element, can combine with nitrogen, eliminates the harm of nitrogen, improves ballistic work, but and crystal grain thinning, the brittle transition temperature of reduction steel, the intensity of raising steel.Therefore, having certain Al in the steel is useful to the improved performance of steel.If but Als too high levels (being the aluminium too high levels) because AlN can separate out in a large number, produces Hot Working Crack on the one hand in hot procedure, on the other hand owing to adding the Al that aluminium too much forms
2O
3Can be trapped in and form inclusion in the steel, all can reduce the performance of steel, so steel Als content of the present invention is controlled at 0.020～0.030%.
Oxygen and nitrogen (O, N): the same as P, S, generally speaking, the O in the steel, N also should be controlled at lower level, guarantee the purity of steel, so the O of steel of the present invention, N content are controlled at 40ppm respectively and below the 60ppm.
Method of manufacture of the present invention, key step and processing parameter are following:
1, smelts
Adopting process pretreated molten iron of desulfurization and high-quality steel scrap as raw material, serves as to ensure to carry out the smelting production of converter Clean Steel with advanced production technologies such as efficient top and bottom complex blowing, the automatic analyses of furnace gas.Handle operation and soft blow technology through optimizing calcium, further come-up is got rid of the non-metallic inclusion in the steel.Adopt single slag technology to smelt, high carbon ferromanganese and silumin deoxidation alloying, the tapping pushing off the slag guarantees one time catch carbon, the converter tapping temperature is controlled at 1630～1650 ℃.The RH operation adopts the dark degasification technique of circulation; Guaranteeing significantly to reduce gas contents such as hydrogen, oxygen, nitrogen under the stable prerequisite of liquid steel temperature; Reduce the disadvantageous effect of obnoxious flavour to steel; Finally obtaining chemical component weight per-cent is C:0.15～0.17%, Si:0.25～0.40%, Mn:1.40～1.55%, P: S≤0.015% :≤0.005%, V:0.05～0.07%, Als:0.020～0.030%, O :≤0.0040%, N≤0.0060%, surplus are Fe and unavoidable impurities.
2, continuous casting
Continuous caster is straight curved type continuous caster, on adorn chain type dummy bar, multi-point bending continuous straightening technology, solidification end is dynamically gently depressed and dynamic two refrigeration techniques optimized, through constant temperature, permanent pulling rate technology, alleviates defectives such as continuously cast bloom center segregation and center porosity; Through tracking, improvement and the optimization of crystallizer protecting residue and the efficient application of mold thermal imager, reduce surface quality defects such as slab surface crack and oscillation mark.Thereby realize the high-quality strand.Detailed process and parameter are controlled as follows: use the medium carbon low alloy steel covering slag, bits will keep dry, and the liquid slag layer gauge control is at 10～15mm; Use carbon-free middle covering agent, be unkitted and forbid when long nozzle or long nozzle do not immerse the molten steel face to add insulating covering agent to middle bag impact zone; The coupling system of different casting section pulling rates and superheating temperature; Under the normal process situation, same heat pulling rate fluctuation does not allow to surpass ± 0.1m/min; The mold inflow temperature is controlled at 38 ± 1 ℃, and the secondary cooling water temperature is controlled at 22～25 ℃; The strand straightening temperature is controlled at 950～1000 ℃, and the temperature difference of strand broad ways must not be above 50 ℃; Carry out the protection cast, guard against secondary oxidation of steel and air-breathing nitrogen pick-up; Strand macroscopic examination result should satisfy category-B center segregation≤1.5 grade, middle crack≤1.5 grade, center porosity≤1.0 grade.
3, heating
Fully guarantee billet heating temperature and soaking time.Heating and temperature control is at 1210 ℃～1250 ℃, total time inside furnace >=200min, wherein soaking time >=30min.Guarantee the abundant solid solution of alloying element, board briquette is even.Furnace gas atmosphere adopts weak oxide or reducing atmosphere to burn steel, and micro-pressure operation avoids casting billet surface to generate excessive oxidation iron sheet and the difficult iron scale of removing.
4, rolling and cooling
Rolling employing roughing and finish rolling two stages controlled rolling, i.e. austenite recrystallization district controlled rolling (claiming rough rolling step usually) and austenite non-recrystallization zone controlled rolling (claiming the finish rolling stage usually).Strengthen pass deformation during roughing, start rolling temperature is 1200～1240 ℃, and the relative draft of single pass has at least twice time to be controlled at more than 18%.Strict each pass deformation of control during finish rolling, 920～950 ℃ of finish rolling start rolling temperatures have two passage draft＞15% at least, extreme trace time draft＞5%, 840～900 ℃ of finishing temperatures.Roll the back steel plate and adopt controlled chilling, 680～720 ℃ of final cooling temperatures obtain the tiny and uniform ferritic+pearlitic structure of crystal grain.
5, normalizing thermal treatment
Rule of thumb formula and combine situ production actual confirms that normalizing temperature is 840 ℃～910 ℃, and soaking time is 10min+t * 1.5min/mm, and wherein t is a steel plate thickness, and unit is mm.
Beneficial effect of the present invention is:
1, through rational designing chemical composition, do not contain noble metals such as Ni, Nb, and other alloying element content is few, has reduced cost of alloy.
2, through the rational chemical design; The good strong plasticity that has of taking above-mentioned technology can obtain stipulating among a kind of GB3531-2008 of meeting " low-temperature pressure container is used Low Alloy Steel Plate " is mated; Good low-temperature impact toughness; And production cost is lower, the normalizing type 16MnDR low-temperature pressure vessel steel plate that specification is controlled.
Description of drawings
Fig. 1 is the metallographic structure figure of the embodiment of the invention 5 steel plates.
Embodiment
Below with embodiment the present invention is made more detailed description.These embodiment only are the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
Embodiment 1
The dark desulfurization of raw material molten iron process molten iron, the converter top and bottom blowing, ladle argon-blown, the LF external refining, RH vacuum-treat and continuous casting process obtain the 250mm heavy slab of the per-cent of chemical component weight shown in the table 1.1240 ℃ of slab heating temperatures, total time inside furnace 314min, 1220 ℃ of fs start rolling temperatures; The relative draft of single pass has at least more than two passages and is controlled at more than 18%; When intermediate blank thickness is 106mm, on roller-way, treat temperature to 913 ℃, it is rolling to carry out subordinate phase subsequently; Finishing temperature is 887 ℃, and the Finished Steel plate thickness is 60mm.After the rolling end, steel plate gets into and quickens cooling (ACC) device, 710 ℃ of final cooling temperatures, and heat is rectified back cold bed cooling.Send into normalizing furnace behind the steel plate ball blast and handle, 880 ℃ of normalizing temperatures, soaking time are 10min+t * 1.5min/mm, and t is a steel plate thickness.Can obtain said steel plate at last.
Embodiment 2
Embodiment is with embodiment 1, and wherein Heating temperature is 1220 ℃, total time inside furnace 320min; Fs, rolling start rolling temperature was 1210 ℃, and the rolling start rolling temperature of subordinate phase is 921 ℃, and intermediate blank treats that temperature thickness is 97mm; Finishing temperature is 856 ℃, and the Finished Steel plate thickness is 44mm.After the rolling end, steel plate gets into and quickens cooling (ACC) device, 705 ℃ of final cooling temperatures, and heat is rectified back cold bed cooling.Send into normalizing furnace behind the steel plate ball blast and handle, 880 ℃ of normalizing temperatures, soaking time are 10min+t * 1.5min/mm, and t is a steel plate thickness.Can obtain said steel plate at last.
Embodiment 3
Embodiment is with embodiment 1, and wherein Heating temperature is 1238 ℃, total time inside furnace 342min; Fs, rolling start rolling temperature was 1228 ℃, and the rolling start rolling temperature of subordinate phase is 918 ℃, and intermediate blank treats that temperature thickness is 73mm; Finishing temperature is 832 ℃, and the Finished Steel plate thickness is 26mm.After the rolling end, steel plate gets into and quickens cooling (ACC) device, 708 ℃ of final cooling temperatures, and heat is rectified back cold bed cooling.Send into normalizing furnace behind the steel plate ball blast and handle, 880 ℃ of normalizing temperatures, soaking time are 10min+t * 1.5min/mm, and t is a steel plate thickness.Can obtain said steel plate at last.
Embodiment 4
Embodiment is with embodiment 1, and wherein Heating temperature is 1245 ℃, total time inside furnace 322min; Fs, rolling start rolling temperature was 1223 ℃, and the rolling start rolling temperature of subordinate phase is 921 ℃, and intermediate blank treats that temperature thickness is 91mm; Finishing temperature is 845 ℃, and the Finished Steel plate thickness is 32mm.After the rolling end, steel plate gets into and quickens cooling (ACC) device, 716 ℃ of final cooling temperatures, and heat is rectified back cold bed cooling.Send into normalizing furnace behind the steel plate ball blast and handle, 880 ℃ of normalizing temperatures, soaking time are 10min+t * 1.5min/mm, and t is a steel plate thickness.Can obtain said steel plate at last.
Embodiment 5
Embodiment is with embodiment 1, and wherein Heating temperature is 1235 ℃, total time inside furnace 319min; Fs, rolling start rolling temperature was 1223 ℃, and the rolling start rolling temperature of subordinate phase is 916 ℃, and intermediate blank treats that temperature thickness is 66mm; Finishing temperature is 822 ℃, and the Finished Steel plate thickness is 22mm.After the rolling end, steel plate gets into and quickens cooling (ACC) device, 710 ℃ of final cooling temperatures, and heat is rectified back cold bed cooling.Send into normalizing furnace behind the steel plate ball blast and handle, 880 ℃ of normalizing temperatures, soaking time are 10min+t * 1.5min/mm, and t is a steel plate thickness.Can obtain said steel plate at last.
Embodiment 6
Embodiment is with embodiment 1, and wherein Heating temperature is 1238 ℃, total time inside furnace 336min; Fs, rolling start rolling temperature was 1230 ℃, and the rolling start rolling temperature of subordinate phase is 922 ℃, and intermediate blank treats that temperature thickness is 100mm; Finishing temperature is 890 ℃, and the Finished Steel plate thickness is 50mm.After the rolling end, steel plate gets into and quickens cooling (ACC) device, 698 ℃ of final cooling temperatures, and heat is rectified back cold bed cooling.Send into normalizing furnace behind the steel plate ball blast and handle, 880 ℃ of normalizing temperatures, soaking time are 10min+t * 1.5min/mm, and t is a steel plate thickness.Can obtain said steel plate at last.
The chemical ingredients (wt%) of table 1 embodiment of the invention 1-6
| Embodiment | C | Si | Mn | P | S | V | Als | O(ppm) | N(ppm) |
| 1 | 0.15 | 0.27 | 1.46 | 0.010 | 0.001 | 0.056 | 0.023 | 18 | 35 |
| 2 | 0.16 | 0.28 | 1.44 | 0.009 | 0.002 | 0.053 | 0.025 | 22 | 38 |
| 3 | 0.17 | 0.29 | 1.44 | 0.011 | 0.002 | 0.058 | 0.025 | 25 | 40 |
| 4 | 0.16 | 0.27 | 1.48 | 0.011 | 0.001 | 0.055 | 0.026 | 20 | 44 |
| 5 | 0.16 | 0.30 | 1.44 | 0.014 | 0.003 | 0.060 | 0.022 | 23 | 42 |
| 6 | 0.16 | 0.28 | 1.43 | 0.008 | 0.001 | 0.055 | 0.028 | 24 | 47 |
Steel plate to embodiment of the invention 1-6 carries out mechanical property and-40 ℃ of transverse impact service checks, and the result sees table 2.
The mechanical property and the impact property of the steel plate of table 2 embodiment of the invention 1-6
Claims (2)
1. normalizing type 16MnDR low-temperature pressure vessel steel plate; It is characterized in that: the chemical ingredients of steel plate is C:0.15～0.17%, Si:0.25～0.40%, Mn:1.40～1.55%, P: S≤0.015% :≤0.005%, V:0.05～0.07%, Als:0.020～0.030% by weight percentage; O: N≤0.0060%≤0.0040%,, surplus are Fe and unavoidable impurities.
2. the method for manufacture of a normalizing type 16MnDR low-temperature pressure vessel steel plate according to claim 1; It is characterized in that: adopt process pretreated molten iron of desulfurization and steel scrap as raw material; Obtaining chemical component weight per-cent through smelting is C:0.15～0.17%, Si:0.25～0.40%, Mn:1.40～1.55%, P: S≤0.015% :≤0.005%, V:0.05～0.07%, Als:0.020～0.030%; O :≤0.0040%, N≤0.0060%, surplus are the steel of Fe and unavoidable impurities, on continuous caster, cast plate slab; To the plate slab heating, heating and temperature control is at 1180 ℃～1250 ℃ in process furnace, and total time inside furnace is controlled at 240～270min; Be rolled then, rolling employing roughing and finish rolling two stages controlled rolling, the roughing start rolling temperature is 1200～1240 ℃, the relative draft of single pass has at least twice time to be controlled at more than 18%; 920～950 ℃ of finish rolling start rolling temperatures have two passage draft＞15% at least, extreme trace time draft＞5%; 840～900 ℃ of finishing temperatures; Roll the back steel plate and adopt controlled chilling, 680～720 ℃ of final cooling temperatures obtain the steel plate that crystal grain is ferritic+pearlitic structure; At last steel plate is carried out normalizing thermal treatment, normalizing temperature is 840 ℃～910 ℃, and soaking time is 10min+t * 1.5min/mm, and wherein t is a steel plate thickness, and unit is mm.
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