CN102876999A - Steel plate for hardening and tempering type low temperature pressure vessel and method for producing steel plate - Google Patents
Steel plate for hardening and tempering type low temperature pressure vessel and method for producing steel plate Download PDFInfo
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Abstract
The invention discloses a steel plate for a hardening and tempering type low temperature pressure vessel with ultralimit thickness, low crack sensitivity and high strength and a method for producing the steel plate. The steel plate comprises the following chemical constituents according to percent by weight: 0.065-0.085% of C, 0.15-0.25% of Si, 1.30-1.50% of Mn, 0.40-0.45% of Ni, 0.15-0.25% of Cr, 0.20-0.25% of Mo, 0.035-0.045% of V, 0.030-0.045% of of Nb, 0.025-0.03% of Ti, 0.020-0.05% of Alt, 0.015% of P, 0.005% of S and the balance of Fe; and the method for preparing the steel plate comprises the steps that molten steel is smelted according to set constituents, the molten steel is cast into a casting blank, two stages of rolling, i.e. rough rolling and fine rolling are carried out after the heating, after quick cooling, a hardening and tempering technology is carried out for thermal treatment, matching of excellent strength, plasticity, cold bending and shock resistance can be achieved, and the requirement of the steel for the low temperature pressure vessel is satisfied.
Description
Technical field
The invention belongs to field of metallurgy, particularly a kind of steel heavy plate for pressure vessels, specifically low-crackle sensitive high strength quenching and tempering type steel plate for low temperature pressure container and the preparation method of a kind of ultralimit thickness (60mm).
Background technology
Pressurized vessel quenching and tempering, high plate owing to have low-welding crack Sensitivity Index characteristic (Crack-Free), also referred to as the CF steel, and is widely used in hydropower industry and spherical tank production.Along with pressure vessel and equipment to high-parameters, maximization future development, not only need to consider the problem of equipment enlarging, security also is problem needing to overcome at first, also being water power and spherical tank must guarantee the requirement of low temperature use properties with the CF steel, drops to current-30 ~-50 ℃ such as the design temperature of propylene and ethene storage tank by-20 ℃ ~-35 ℃ of the eighties in 20th century.
Before 1985, the whole dependence on import of China's pressurized vessel quenched and tempered high tensile strength plate are wherein take the modified high strength CF steel of Japanese low-crackle sensitive as many.1989, in GB GBl50-1989 at first listed domestic low temperature (20 ~-40 ℃) pressurized vessel with hardening high-strength steel in China; 2003, taken the lead to draft by Wuhan Iron and Steel Plant and formulated pressurized vessel with quenched and tempered high tensile strength plate standard GB19189-2003, at this moment, 07MnCrMoVR (CF-62) steel plate of Wuhan Iron and Steel Plant development with abroad compare, intensity, toughness, welding property all approach, even surpass the JISG3115 standard of Japanese SPV490.2011, still taken the lead by Wuhan Iron and Steel Plant, the associating old China hand is with mechanical engineering main office, metallurgical industry information standard research institute, Xinyu steel enterprise company limited, Hunan Hualing Xiangtan Iron ﹠ Steel Co., Ltd., Hefei General Machinery Institute, Nangang, Anshan iron and steel plant, Ji steel, Shoudu Iron and Steel Co and Chinese extraordinary test set research institute, GB19189-2003 is revised, implement new GB GB19189-2011 on February 1st, 2012, the new pressurized vessel quenched and tempered steel trade mark, i.e. a 07MnNiMoDR have been increased according to cold zone scope difference in the new national standard.It should be noted that the thickness of stipulating this steel in new national standard is 10 ~ 50mm ,-50 ℃ of ballistic work absorbed energies are not less than 80J.Consider at present under some special occasions, require steel plate to exceed the thickness limit of stipulating in the new national standard, even reach 60mm, also require simultaneously mechanics and processing performance requirement in the assurance new national standard, also do not develop the precedent of analogous products for manufacturing concern, this brings certain difficulty for manufacturing enterprise.
Summary of the invention
The low-crackle sensitive high strength quenching and tempering type steel plate for low temperature pressure container and the preparation method that the purpose of this invention is to provide a kind of ultralimit thickness (60mm).The present invention satisfies mechanical property and the processing performance requirement of this class steel by suitable alloying element design and hot rolling and heat treating method.
The objective of the invention is to be achieved through the following technical solutions:
A kind of quenching and tempering type steel plate for low temperature pressure container is characterized in that: this steel plate chemical ingredients is by weight percentage: C 0.065 ~ 0.085%; Si 0.15 ~ 0.25%; Mn 1.30 ~ 1.50%; Ni 0.40 ~ 0.45%, and Cr 0.15 ~ 0.25%, and Mo 0.20 ~ 0.25%, and V 0.035 ~ 0.045%; Nb 0.030 ~ 0.045%; Ti 0. 025 ~ 0.03%; Alt 0.020 ~ 0.05%; P ￡ 0.015%; S ￡ 0.005%; Surplus is Fe; It rolls the attitude metallographic structure is granular bainite and ferrite bainite, and the metallographic structure of quenching state is ferrite bainite, final tempering attitude be organized as tempered sorbite+bainite.
Ultralimit thickness of the present invention (60mm) low-crackle sensitive high strength quenching and tempering type steel plate for low temperature pressure container, room temperature yield strength 3600MPa, tensile strength 3650MPa, fracture elongation 320%,-50 ℃ of ballistic works are greater than 120 J (impact specimen is of a size of 55 mm * 10 mm * 10 mm), cold-bending property is qualified, welding cold cracking sensitivity coefficient P
Cm￡ 0.19 %.
A kind of preparation method of quenching and tempering type steel plate for low temperature pressure container is characterized in that the method may further comprise the steps:
1) by the chemical ingredients smelting molten steel of setting and cast the strand that thickness is 220 mm; The chemical ingredients of setting is by weight percentage: C 0.065 ~ 0.085%; Si 0.15 ~ 0.25%; Mn 1.30 ~ 1.50%; Ni 0.40 ~ 0.45%, and Cr 0.15 ~ 0.25%, and Mo 0.20 ~ 0.25%, and V 0.035 ~ 0.045%; Nb 0.030 ~ 0.045%; Ti 0. 025 ~ 0.03%; Alt 0.020 ~ 0.05%; P ￡ 0.015%; S ￡ 0.005%; Surplus is Fe;
2) strand is carried out roughing after according to two stepwise heating homogenizing, the fs is heated to 900 ℃, insulation 2h; Subordinate phase is heated to 1150～1200 ℃, is incubated 1 h; The roughing rolling pass is 3 passages, and the roughing start rolling temperature is 1050～1150 ℃, and finishing temperature is more than 1000 ℃; Every time draft is not less than 20%, and total reduction is 50 ~ 55%, and obtaining thickness is the intermediate blank of 110～100 mm; Wherein, the first percentage pass reduction of roughing is that 20%, the 2 percentage pass reduction is that the draft of 22.5%, the 3 passage is 26%;
3) with intermediate blank finish rolling 3 passages, front two passage drafts are not less than respectively 10%, and final percentage pass reduction is more than 20%, and total reduction is 40%; The finish rolling start rolling temperature is 900～920 ℃, and finishing temperature is more than 850 ℃; The thickness of steel plate is 60 mm after the finish rolling;
4) speed of the steel plate after the finish rolling with 15～60 ℃/s is cooled to below 600 ℃, carry out subsequently the modified thermal treatment of off-line, steel plate is reheated to 930 ℃, insulation 2h, and tempering process is (610 ~ 630) ℃ * 100min, tempering time begins to calculate to reach actual temperature, obtains the quenching and tempering type steel plate for low temperature pressure container.
What the present invention obtained is a kind of ultralimit thickness (60mm) low-crackle sensitive high strength quenching and tempering type steel plate for low temperature pressure container, Composition Design of the present invention be based on following some:
Although C has positive effect to the reinforcement of steel plate, but along with then can causing plasticity and impelling strength, the increase of C content reduces, the ductile-brittle transition temperature of steel is reduced, tendency to welded heat affecting zone sclerosis and embrittlement increases, produce easily welding cold cracking, totally unfavorable to plasticity, the welding property of steel; In the Composition Design of steel for low-temperature pressure container, have good welding property and low-temperature impact toughness preferably in order to make steel plate, the carbon content in the steel must be controlled in 0.065 ~ 0.085% lower scope.
Mn is the reinforced alloys element of steel, is to enlarge the austenitic area element.The increase of Mn content can improve stabilization of austenite, reduce critical cooling velocity, reinforced ferrite significantly improves hardening capacity, can make simultaneously in the rear drawing process of quenching to organize the decomposition velocity of transformation to slow down, improve tempered structure stability, but too high levels will make steel at high temperature cause grain coarsening, and increase the temper brittleness tendency of steel, with the increase of Mn/C, the brittle transition temperature of steel significantly reduces, and Mn/C is controlled at 18 ~ 19 and is advisable; In addition, Mn is too high, and the carbon equivalent that makes improves, and is also unfavorable to weldability.Mn too high levels in the steel also can be given and be smelted and the rolling difficulty of bringing, and is also unfavorable to the toughness of steel.Therefore, Mn content is controlled in 1.30 ~ 1.50% scopes.
The Si element can improve sosoloid hardness and intensity in the steel, not only can increase the hardening capacity of steel, but also can increase the temper resistance of hardened steel, makes the steel can be in tempering under the comparatively high temps, thereby improves toughness and the resistance for delayed fracture of steel; Si can significantly improve elastic limit, yield strength and the yield tensile ratio of steel.Si content Gao Shihui makes steel produce free carbon and greying, and the plasticity of steel and welding property are reduced; In addition, the Si too high levels can make the thermal conductivity variation of steel, and steel ingot, billet surface are prone to cracking or crack defect.Therefore, the content of Si is controlled at about 0.20%.
Al is reductor commonly used in the steel.Add a small amount of Al in the steel, but crystal grain thinning improves impelling strength, aluminium also has certain antioxygen and erosion resistance, but the aluminium too high levels will affect hot workability, welding property and the machinability of steel, therefore be controlled in 0.02 ~ 0.05 % scope;
With the raising of Mo content, yield strength, the tensile strength of steel all increase, and the increase rate of tensile strength will be higher than yield strength, and yield tensile ratio reduces with the adding of Mo.With regard to quenched and tempered steel, increase with Mo content, its intensity, plasticity and low-temperature impact toughness all improve a lot.Because the Mo solid solution is when ferrite and austenite, the C curve of steel is moved to right, strengthen the stability of supercooled austenite, thereby significantly improve the hardening capacity of steel, and Mo can significantly improve the recrystallization temperature of steel, improve temper resistance, can obtain the compact grained sorbite after modified, obdurability is improved.When forming the carbide of Mo, can play dispersion-strengthened action.When Mo content is low (＜0.30%), mainly take solution strengthening, raising hardening capacity and temper resistance as main.Consider that the steel plate among the present invention belongs to ultralimit thickness, is controlled at 0.20 ~ 0.25% with Mo content and is advisable.
Ni belongs to the element of whole solid solutions in steel, have the effect of obvious reduction Cold Brittleness Transition Temperature, and the low-temperature impact toughness that improves steel is played an important role.Its mechanism of action is: Ni and Fe can be present in a and the g iron phase with the form of dissolving each other, and by its adsorption refinement ferrite crystal grain in crystal grain, improve the impelling strength of steel.But Ni enlarges the austenitic area element, reduces austenitic transition temperature, thereby can affect the velocity of diffusion of carbon and alloying element, stop austenite to perlitic transformation, reduce the critical cooling rate of steel, can improve the hardening capacity of steel, easily make to occur bainite and martensite in the steel.Therefore, controlling suitable Ni content is the key of improving impelling strength, and the Ni content of this steel grade design is 0.40 ~ 0.45%.
In steel for low-temperature pressure container, Cr content generally is no more than 0.3%, and its effect mainly contains three aspects: 1) Formed compound, intensity, hardness and the erosion resistance of raising steel; 2) the CCT curve is moved to right, increase the hardening capacity of steel; 3) refinement martensite and perlite lamella size.In order to keep the stability of high temperature austenite tissue, usually add a small amount of chromium, this mainly is because the carbide (M of most of chromium
7C
3) surrounded by austenitic matrix or its conversion product, be in the carbide state and be dissolved among the austenitic matrix.The Cr constituent content has certain influence to pearlitic fineness and hardness, this is because after adding microalloy element Cr, improved the hardening capacity of steel, the CCT curve of steel is moved right, thereby suppressed separating out of proeutectoid ferrite, in the constant situation of certain speed of cooling, perlite and martensite plate interlamellar spacing obtain refinement, thereby have improved the intensity of quenching and tempering type container panel and do not reduce its plasticity.In steel heavy plate for pressure vessels 07MnCrMoVDR, the lifting of intensity and hardening capacity is seemed extremely important, the content range of this steel grade Cr when design is 0.15 ~ 0.25%.
Also usually adding titanium elements in steel, mainly is to utilize Ti and C, N that good affinity is arranged, and forms TiC, TiN to remove C, plasticity or the toughness of N interstitial atom to improve steel in the matrix.Simultaneously, titanium also can produce the precipitation strength effect.Along with the titaniferous amount increases, the effect of precipitation strength increases.If it is enough high to add the per-cent of titanium, it is favourable to the shape of control sulfide.After in micro-alloyed steel, adding a small amount of titanium (massfraction is less than 0.02%), even at high temperature also can demonstrate a kind of effect of strongly inhibited Austenite Grain Growth.Suppress Austenite Grain Growth and be since exist in the steel very tiny TiN particulate (＜20nm), it can still keep relative stability in whole following process process (heating, course of hot rolling and welding processing).Therefore, even under higher finishing temperature, also can obtain to have the product of good obdurability equilibrium.Because Ti is carbide, and N, O, C are had extremely strong avidity, the avidity of Ti and S can reduce the probability that generates iron sulphide greater than the avidity of Fe and S, reduces the red brittleness of steel.The carbide bonding force that Ti and C form is extremely strong, stabilizer pole, be difficult for decomposing, and only has when Heating temperature reaches more than 1000 ℃, just begins to dissolve in lentamente in the sosoloid, is enriched in the grain boundaries of steel before not dissolving in, and the TiC particulate has the effect of prevention grain growth.Ti can dissolve in g and a mutually in, form sosoloid, produce and strengthen.The compound TiN of Ti and N, even 1250 ℃ also can stop AUSTENITE GRAIN COARSENING, utilize this characteristic, can stop in the welding process austenite at high temperature too thick, thereby improve the container panel weldability, the add-on of Ti should be greater than 0.02% in the general steel, and the Ti content in this steel grade designs according to ￡ 0.03%Ti.
Micro alloying element V increases its amount that is solidly soluted in the austenite with the raising of quenching temperature to some extent, and the solubleness of V in ferrite is than little many of the solubleness in austenite.Carrying out along with phase transformation, under certain thermodynamics and kinetics condition, V main form with carbonitride in low-carbon micro steel-alloy is present on matrix and the crystal boundary, increase the temper resistance after steel quenches, tempered structure easily produces the secondary hardening phenomenon, and the effect of crystal grain thinning and precipitation strength is arranged.The effect of V is by forming V (C, N) affect tissue and the performance of steel, main in the ferrite of austenite grain boundary Precipitation, in the operation of rolling, can suppress austenitic recrystallize, and prevention grain growth, thereby play perlite and bainite grain-size under the non-quality adjustment condition of refinement, thereby improve intensity and the toughness of steel.V has material impact to the hardening capacity of steel, and when steel was heated to critical temperature, V was dissolved in the austenite high-carbon regions of initial formation, thereby has increased the hardening capacity of steel, is producing martensitic stucture in the process of cooling fast.In the design of this steel grade, V content span of control is 0.035 ~ 0.045%.
Nb is the same with elements such as V, Ti, also is micro alloying element the most frequently used in the low alloy steel.Their effects in steel are mainly manifested in two aspects: 1) in hot procedure, suppress austenitic Deformation recrystallization and stop growing up of its crystal grain; 2) separate out the precipitation strength effect of performance Nb, V, Ti by the strain inducing of its carboritride.Nb has the strongest grain refining strengthening effect in steel, V has the strongest precipitation strength effect in steel, and Ti then between Nb and V between the two.Nb content is ten thousand/several will bringing about tangible results, and when the content of Nb surpassed 0.05% (massfraction), strengthening effect reached capacity and do not play adjection.Microalloy element Nb also has the vital role of grain refining in microalloyed steel.Wherein, the carbonitride that early solidification is separated out is conducive to form the axle casting such as comparatively tiny and makes tissue; This tiny original austenite grains can suppress growing up of austenite crystal in heat-processed, improve austenitic recrystallization temperature; At cold zone, precipitation and the strain inducing of Nb are separated out behavior, can promote the enrichment of γ-a phase transformation to give birth to nuclear; In a district, suppress ferrite crystal grain and grow up.Therefore, should make Nb as far as possible with form disperse educt in steel of compound.The superheated susceptivity of Nb energy crystal grain thinning and reduction steel improves intensity, and the NbC that separates out can stop grain growth, crystal grain thinning.Especially in the situation that the Mo element exists, its precipitate small and dispersed distributes, and the precipitation strength effect is more obvious.The Nb of trace and Cu, B interact, and the Bainite Phases of Some temperature is reduced, and obtain tiny lath of bainite after the phase transformation.Nb can improve anti-hydrogen under weather-resistant and the high temperature, nitrogen, ammonia corrosion ability simultaneously.But the content height can make plasticity and toughness descend to some extent.Therefore, Nb content is controlled at about 0.05 % in this steel.
Control about P and S: the P in the steel, S process as harmful element, and wish to be reduced to minimum level.The increase of P content can make intercrystalline cracking stress reduce in the steel, and brittle transition temperature raises, and causes cold shortly, is unfavorable for cold working and welding, and easily segregation, reduces that P content is the key link of smelting in the steel.S forms low melting point FeS eutectic in steel, cause hot-short; Simultaneously, S and some other element form compound, exist with the sulfide inclusion form, easily form stratified segregation, and the impelling strength of steel is brought totally unfavorable impact; When S＜0.010%, the toughness of steel is improved rapidly.Improve the low-temperature flexibility of steel plate, must reduce as far as possible the content of P, S.Here, the content span of control that provides P and S is: P ￡ 0.015%, S ￡ 0.005%.
Controlled rolling and controlled cooling and modified heat treated foundation that the preparation method of ultralimit thickness of the present invention (60mm) low-crackle sensitive high strength quenching and tempering type steel plate for low temperature pressure container adopts are:
Operation of rolling employing high temperature austenite recrystallization zone and non-recrystallization district two-stage control are rolling, cool off fast subsequently.It is rolling to carry out the multi-pass gross distortion in the high temperature recrystallization zone, makes austenite crystal obtain abundant refinement by dynamic recrystallization; The non-recrystallization district carries out multi-pass, and to accumulate continuously gross distortion rolling, austenite crystal is crushed, increases the austenite crystal interfacial area, cause a large amount of subgrain boundary segregation band, deformation bands, high density dislocation district, bainite transformation forming core when impelling cooling suppresses growing up of bainite ferrite.Austenite grain boundary, the subgrain boundary segregation band that flattens can effectively stop lath of bainite development growth, makes lath of bainite obtain refinement.
Modified thermal treatment is to obtain needed intensity and toughness for the steel plate after guaranteeing to roll.Reheat to the austenitic area, austenitic transformation will occur in the tissue after rolling, and in quenching process subsequently bainite+martensitic transformation will occur, and drawing process will further obtain needed tempered sorbite and ferrite bainite tissue.
The present invention starts with from the Composition Design of steel grade, develops the manufacturing process of a kind of ultralimit thickness (60mm) low-crackle sensitive high strength quenching and tempering type steel plate for low temperature pressure container.Advantage of the present invention is:
(1) consider intensity, plasticity, toughness and the welding property of low-temperature pressure container and the requirement of cold-bending property, optimization design the chemical ingredients of steel, adopt rational rolling technology and thermal treatment process, obtain desirable microtexture, guarantee its performance requriements.
(2) utilize the present invention, can obtain the steel plate for low temperature pressure container of ultralimit thickness (60mm), especially-50 ℃ ballistic work is greater than 120 J, head and shoulders above set quota in the new national standard.
Description of drawings
Fig. 1 is the metallographic structure figure of the technique contrast 1 in the embodiment of the invention;
Fig. 2 is the metallographic structure figure of the technique contrast 2 in the embodiment of the invention;
Fig. 3 is the metallographic structure figure of the technique contrast 3 in the embodiment of the invention;
Fig. 4 is the metallographic structure figure of the technique contrast 4 in the embodiment of the invention;
Fig. 5 is the metallographic structure figure of the technique contrast 5 in the embodiment of the invention;
Fig. 6 is the metallographic structure figure of the technique contrast 6 in the embodiment of the invention.
Embodiment
The embodiment of the invention is observed the metallographic structure of steel plate for low temperature pressure container and is adopted LEICA Q550 IW type opticmicroscope.
Room temperature tensile ,-50 ℃ of shock tests are carried out at CMT5105-SANS microcomputer controlled electronic universal testing machine, and 180 ° of pliability tests (D=3a) are carried out at 100 ton of four column pressure trier.
The room temperature tensile sample is made square-section standard tensile sample by GB/T228-2002 " metallic substance tensile test at room temperature method ";-50 ℃ of impact experiments carry out according to GB/T229-2007 " the metallic substance summer is than pendulum impact test method ", and equipment is Instron 9250HV drop hammer impact testing machine, and impact specimen is of a size of 55mm * 10mm * 8mm; Crooked experiment then carries out according to GB/T 232-1999 " bend test of metal materials method ".
Embodiment
Here provide one group of experimental result as embodiment, the composition of steel is consistent, steel-making, continuous casting, forging stock heating and rolling technology are consistent, and difference is follow-up quenching-and-tempering process system, provides some modifier treatment techniques, Performance Detection and metallographic structure as a comparison case.
1) steel-making: smelted one heat steel, its actual chemical ingredients (weight percent %) is C:0.0686 %, Si:0.232%, Mn:1.454%, Al:0.05 %, Cr:0.256%, Ni:0.452%, Mo:0.22%, Nb:0.04 %, V:0.043%, Ti:0.03%, Cu:0.0151%, S:0.001%, P:0.0042%, N:0.0039%, O:0.0028%, surplus is Fe, Cu content is low to be residual.Be cast into the continuously cast bloom that specification is 220mm ' 2280mm ' 2100mm; Blank through heat inspection, cooling in heap 48h, enter the check of stokehold blank surface, the blank surface quality is better, without the reconditioning base.
(2) strand heating and rolling: strand is carried out roughing after according to two stepwise heating homogenizing, and the fs is heated to 900 ℃, is incubated 2h; Subordinate phase is heated to 1150 ~ 1200 ℃, insulation 1h.The roughing rolling pass is 3 passages, and the roughing start rolling temperature is 1050 ~ 1150 ℃, and finishing temperature is more than 1000 ℃; The first percentage pass reduction of roughing is 20%, and this moment, steel billet thickness was 176mm, and the 2nd percentage pass reduction is 22.5%, and corresponding steel billet thickness is 136mm, and the draft of the 3rd passage is 26%, and obtaining thickness is the intermediate blank of 100mm; Also be that every time draft need be not less than 20%, this moment, total reduction was 55%, and workpiece thickness is 100 mm.Subsequently, be that 900 ~ 920 ℃, finishing temperature are to carry out 3 passage finish rolling under the condition more than 850 ℃ with intermediate blank at start rolling temperature, front two passage drafts are not less than respectively 10%, and final percentage pass reduction is more than 20%, and total reduction is 40%; The thickness of steel plate is 60 mm after the finish rolling.The speed of steel plate after the finish rolling with 15 ~ 60 ℃/s is cooled to below 600 ℃, carries out subsequently the modified thermal treatment of off-line.
(3) off-line quenching-and-tempering process and equipment: steel plate is reheated to 930 ℃, quench behind the insulation 2h; Tempering process is got respectively following 6 kinds: 610 ℃ * 120min (Comparative Examples 1), 630 ℃ * 60min (Comparative Examples 2), 630 ℃ * 80min (Comparative Examples 3), 630 ℃ * 100min (Comparative Examples 4), 630 ℃ * 120min (Comparative Examples 5) and 640 ℃ * 80min (Comparative Examples 6), and tempering time begins to calculate to reach actual temperature; Off-line modifier treatment equipment can carry out at quenching press.
Its metallographic structure is tempered sorbite and ferrite bainite as shown in drawings.
The mechanical property detected result is:
Technique comparative study result from the above embodiments as can be known, the quenching and tempering process system that obtains the steel for low-temperature pressure container of excellent mechanical performances is: 930 ℃/120min+ (610 ~ 630) ℃/100min.The mechanical property result of this moment is: normal temperature tensile yield strength 3600MPa, tensile strength 3670MPa, elongation after fracture 320 %;-50 ℃ of ballistic works absorb energy 3120J; 180 ° of pliability tests (D=3a) are intact, and cold-bending property is qualified, welding cold cracking Sensitivity Index P
Cm=0.19%.
Claims (3)
1. quenching and tempering type steel plate for low temperature pressure container, it is characterized in that: this steel plate chemical ingredients is by weight percentage: C 0.065 ~ 0.085%; Si 0.15 ~ 0.25%; Mn 1.30 ~ 1.50%; Ni 0.40 ~ 0.45%, and Cr 0.15 ~ 0.25%, and Mo 0.20 ~ 0.25%, and V 0.035 ~ 0.045%; Nb 0.030 ~ 0.045%; Ti 0. 025 ~ 0.03%; Alt 0.020 ~ 0.05%; P ￡ 0.015%; S ￡ 0.005%; Surplus is Fe; It rolls the attitude metallographic structure is granular bainite and ferrite bainite, and the metallographic structure of quenching state is ferrite bainite, final tempering attitude be organized as tempered sorbite+bainite.
2. the preparation method of a quenching and tempering type steel plate for low temperature pressure container claimed in claim 1 is characterized in that the method may further comprise the steps:
1) by the chemical ingredients smelting molten steel of setting and cast the strand that thickness is 220 mm; The chemical ingredients of setting is by weight percentage: C 0.065 ~ 0.085%; Si 0.15 ~ 0.25%; Mn 1.30 ~ 1.50%; Ni 0.40 ~ 0.45%, and Cr 0.15 ~ 0.25%, and Mo 0.20 ~ 0.25%, and V 0.035 ~ 0.045%; Nb 0.030 ~ 0.045%; Ti 0. 025 ~ 0.03%; Alt 0.020 ~ 0.05%; P ￡ 0.015%; S ￡ 0.005%; Surplus is Fe;
2) strand is carried out roughing after according to two stepwise heating homogenizing, the fs is heated to 900 ℃, insulation 2h; Subordinate phase is heated to 1150～1200 ℃, is incubated 1 h; The roughing rolling pass is 3 passages, and the roughing start rolling temperature is 1050～1150 ℃, and finishing temperature is more than 1000 ℃; Every time draft is not less than 20%, and this moment, total reduction was 50 ~ 55%, and workpiece thickness is 110 ~ 100 mm;
3) with intermediate blank finish rolling 3 passages, front two passage drafts are not less than respectively 10%, and final percentage pass reduction is more than 20%, and total reduction is 40%; The finish rolling start rolling temperature is 900～920 ℃, and finishing temperature is more than 850 ℃; The thickness of steel plate is 60 mm after the finish rolling;
4) speed of the steel plate after the finish rolling with 15～60 ℃/s is cooled to below 600 ℃, carry out subsequently the modified thermal treatment of off-line, steel plate is reheated to 930 ℃, insulation 2h, and tempering process is (610 ~ 630) ℃ * 100min, tempering time begins to calculate to reach actual temperature, obtains the quenching and tempering type steel plate for low temperature pressure container.
3. the preparation method of quenching and tempering type steel plate for low temperature pressure container according to claim 1 is characterized in that: step 2) in, the first percentage pass reduction of roughing is that 20%, the 2 percentage pass reduction is that the draft of 22.5%, the 3 passage is 26%.
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| CN103343298A (en) * | 2013-07-12 | 2013-10-09 | 鞍钢股份有限公司 | Production method of 07MnNiMoDR steel for low-temperature container |
| CN104018081A (en) * | 2014-06-25 | 2014-09-03 | 武汉钢铁(集团)公司 | Low-temperature resistant special steel bar and production method thereof |
| CN104726787A (en) * | 2013-12-23 | 2015-06-24 | 鞍钢股份有限公司 | High-strength pressure vessel thick plate with good low-temperature toughness and production method |
| CN105177452A (en) * | 2015-09-08 | 2015-12-23 | 山东钢铁股份有限公司 | Alloy steel plate for pressure container and preparation method thereof |
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| CN111004978B (en) * | 2020-01-02 | 2021-04-27 | 鞍钢股份有限公司 | Low-alloy high-temperature-resistant pressure vessel steel plate and production method thereof |
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