CN102618799A - High-performance quenched and tempered steel plate with 80 kg carbon equivalent and manufacturing method of high-performance quenched and tempered steel plate - Google Patents
High-performance quenched and tempered steel plate with 80 kg carbon equivalent and manufacturing method of high-performance quenched and tempered steel plate Download PDFInfo
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Abstract
The invention provides a high-performance quenched and tempered steel plate with 80 kg carbon equivalent and a manufacturing method of the high-performance quenched and tempered steel plate. The high-performance quenched and tempered steel plate comprises the following ingredients by weight percent: 0.05 to 0.12 percent of C, 0 to 0.20 percent of Si, 1.20 to 1.60 percent of Mn, 0 to 0.013 percent of P, 0 to 0.003 percent of S, 0.10 to 0.30 percent of Cu, 0.10 to 0.40 percent of Ni, 0.10 to 0.30 percent of Cr, 0.05 to 0.30 percent of Mo, 0.035 to 0.065 percent of Als, 0.005 to 0.011 percent of Ti, 0.015 to 0.045 percent of V, 0 to 0.0060 percent of N, 0.001 to 0.004 percent of Ca, 0.0006 to 0.0013 percent of B, and Fe in balancing amount. By adopting a low-C low-Si high-Mn low-N-(Ti+N+B) microalloyed steel ingredient system as the foundation, and optimizing recrystallization rolling control, quenching and tempering process, the invention has the advantages that the microstructure of the steel plate is tiny tempered martensite or tempered lower bainite; the average size of colonies is lower than 25 Mum; the yield strength is larger than or equal to 690MPa; the tensile strength is larger than or equal to 780 MPa; the Charpy impact power (single value) at -40 DEG C is equal to or larger than 100 J; moreover, the Charpy impact power (single value) of a welding heat affected zone (HAZ) at -40 DEG C is equal to or larger than 47 J, and the stretch rate Delta 5 thereof is equal to or larger than 15 percent.
Description
Technical field
The present invention relates to the method for manufacture of hardened and tempered steel plate; Being particularly related to low-carbon-equivalent 80 feather weight high-performance hardened and tempered steel plates and method of manufacture thereof arrives; Hardened and tempered steel plate ys>=690MPa, tensile strength>=780MPa ,-40 ℃ Charpy ballistic work (single value)>=100J; Superior weldability is Charpy ballistic work (single value)>=47J of-40 ℃ of welded heat affecting zone (HAZ), extensibility δ
5>=15%, the microstructure of hardened and tempered steel plate is tiny tempered martensite+tempering lower bainite.
Background technology
As everyone knows; Low-carbon (LC) (HS) low alloy steel is one of most important structural timber, is widely used among petroleum natural gas pipeline, ocean platform, shipbuilding, bridge structure, boiler vessel, building structure, automotive industry, transportation by railroad and the machinofacture.Low-carbon (LC) (HS) low alloy steel performance depends on the process system of its chemical ingredients, manufacturing processed; Wherein intensity, toughness and weldableness are the most important performances of low-carbon (LC) (HS) low alloy steel, and its final decision is in the chemical ingredients and the microstructure of finished steel.Along with science and technology constantly advances; People propose higher requirement to the obdurability of high-strength steel, strong plasticity coupling; Promptly when keeping lower manufacturing cost, improve the comprehensive mechanical performance and the use properties of steel plate significantly; Consumption to reduce steel is practiced thrift cost, the own wt, stability and the security that alleviate steelwork, and what is more important is further to improve steelwork security and stability and cold and hot working property.
Started the research climax that develops high-performance steel iron material of new generation in the Japan and Korea S European Union scope at present; Try hard to establish optimization meter and the better coupling of organizing of innovation manufacturing process technology acquisition through alloy combination; When making high-strength steel obtain better obdurability, strong plasticity coupling and weldableness; Realize stable batch, the low-cost manufacturing, improve product market competitiveness.
Traditional tensile strength mainly adds tempering (DQT or QT) through quenching greater than the hardened and tempered steel plate of 780MPa; Be that so-called hardening and tempering method is produced; This just requires steel plate necessity to have sufficiently high hardening capacity, i.e. hardenability index DI>=2 * Finished Steel plate thickness " DI=0.367C
0.5(1+0.7Si) (1+3.33Mn) (1+0.35Cu) (1+0.36Ni) (1+2.16Cr) (1+3Mo) (1+1.75V) (1+1.77Al) * 25.4 (mm) "; with guarantee steel plate have sufficiently high intensity, good low-temperature flexibility and along the microstructure of steel plate thickness direction and performance evenly; therefore in steel, add alloying elements such as a large amount of Cr, Mo, Ni, Cu inevitably; in this type steel plate alloying element contents such as Mo, Ni generally to be controlled at>=0.50%; carbon equivalent Ceq is also up to more than 0.50%, in addition noble element Ni content to be controlled at>=1.00% or more (clear 59-129724, put down 1-219121).So; Not only the alloy content of steel plate is higher, and carbon equivalent Ceq and welding cold cracking Sensitivity Index Pcm are also higher, and this brings bigger difficulty to site welding; Need preheating, postwelding to need thermal treatment before the weldering, welding cost raises, welding efficiency reduces, welding work on the spot environmental degradation; And the also rising significantly of steel plate manufacturing cost, influence the steel plate market competitiveness and promote the use of.Though this hardening and tempering process is produced the requirement that the technical indicators such as intensity, low-temperature flexibility and unit elongation of steel plate can satisfy the user; But the steel plate manufacturing cost is high, the welding processing cost of manufacture high; Except that engineerings such as the flow pipe of high request and volute, low-temperature high-strength container, ocean platform are used; Be difficult to promote to industries such as the engineering machinery that has a large capacity and a wide range, bridge structure, automotive industry and transportation by railroads, the use range of product receives bigger restriction.
Existing a large amount of patent documentations are just explained intensity and the low-temperature flexibility that how to realize the mother metal steel plate; Just improve steel plate welding ability property; It is less to obtain good welded heat affecting zone HAZ low-temperature flexibility explanation; Do not relate to how when improving steel plate tensile strength yet; Improve the tension unit elongation of steel plate; More do not relate to the manufacturing cost and the welding processing cost of manufacture that stably reduce steel plate how in batches, referring to the clear 63-93845 of Japanese Patent, clear 63-79921, clear 60-258410, special flat 4-285119, special flat 4-308035, flat 3-264614, flat 2-250917, flat 4-143246 and U.S. Pat Patent4855106, US Patent5183198, US Patent4137104, US Patent4790885, US Patent4988393, US Patent5798004, European patent EP 0867520A2, the EP 0288054A2 etc. of opening of opening.
Summary of the invention
The purpose of this invention is to provide a kind of low-carbon-equivalent 80 feather weight high-performance hardened and tempered steel plate and method of manufacture thereof; Unitized design through the steel plate alloying element combines with special hardening and tempering process (RCR+QT), is obtaining excellent low-temperature flexibility, HS (tensile strength>=780MPa), unit elongation δ
5In the time of>=15%, steel plate has ultralow carbon equivalent Ceq, and good weldableness the more important thing is and realized the low-cost manufacturing of quenching and tempering, high plate, low welding processing cost of manufacture; And the over-all properties that has successfully solved high-strength hardened and tempered steel plate is conflicted in composition design, technological design with manufacturing cost, welding processing cost of manufacture each other, the very difficult problem that is in harmonious proportion; Promptly when improving quenching and tempering, high plate over-all properties, will cause the rising of manufacturing cost, welding processing cost; Otherwise, when reducing quenching and tempering, high plate manufacturing cost, welding processing cost, will cause the rapid decline of steel plate over-all properties; When how to obtain the excellent over-all properties of quenching and tempering, high plate, user's use properties simultaneously, the mother metal steel plate has cheap manufacturing cost.
For achieving the above object, technical scheme of the present invention is:
The present invention adopts the composition system of low N-(Ti+V+B) micro-alloyed steel of the low high Mn-of Si-of low C-as the basis, suitably improves the molten Als content of acid and Als>=12 * [(%N in the steel
Total)-0.292 (%Ti)], control Mn/C>=12, Ceq≤0.43%, (%Si) * (%C)≤0.012, Mo equivalent>=0.30%, Cr equivalent>=0.40%, Ni/Cu>=0.50, (Cu+Ni+Mo+Cr) alloying, Ca handle; And Ca/S is than between 1.00～3.00, (%Ca) * (%S)
0.18≤2.5 * 10
-3, control F * DI index>=metallurgical technology control devices such as 1.2 * Finished Steel plate thickness; Optimize recrystallize controlled rolling+hardening and tempering process (Q+T); The microstructure that makes the finished product steel plate is tiny tempered martensite+tempering lower bainite, and average colony size obtains evenly good obdurability below 25 μ m.
Concrete, low-carbon-equivalent 80 feather weight high-performance hardened and tempered steel plates of the present invention, its composition weight percent is: C:0.05%～0.12%, Si :≤0.20%; Mn:1.20%～1.60%, P :≤0.013%, S :≤0.003%, Cu:0.10%～0.30%; Ni:0.10%～0.40%, Cr:0.10%～0.30%, Mo:0.05%～0.30%, Als:0.035%～0.065%; Ti:0.005%～0.011%, V:0.015%～0.045%, N :≤0.0060%; Ca:0.001%～0.004%, B:0.0006%～0.0013%, all the other are Fe and unavoidable impurities; And above-mentioned constituent content must satisfy following relation simultaneously:
Mn/C >=12 guarantee steel plate Charpy bar fracture fiber rate >=50% under-40 ℃ of conditions;
Als>=12 * [(%N
Total)-0.292 (%Ti)], to guarantee having enough solid solution Als in the steel, prevent that N from combining with B; Form BN, solid solution [B] in the protection steel, and suppress AlN and separate out at the thick chain of original austenite crystal prevention; Promote that AlN separates out at intracrystalline and crystal boundary with the small and dispersed state, improve steel plate low-temperature flexibility, weldableness;
Control Ceq≤0.43%, improve the weldableness of high-strength quenched and tempered steel, guarantee that steel plate is not welding under the preheating condition;
(%Si) * (%C)≤0.012, increase the martensitic transformation critical cooling velocity, promote lower bainite to form, improve high-strength hardened and tempered steel plate obdurability coupling; Separate out on the M/A island among the inhibition welded H AZ, improves steel plate weldableness and welded H AZ toughness;
Mo equivalent >=0.30%, Cr equivalent >=0.40% are guaranteed hardened and tempered steel plate hardening capacity and anti-temper softening, guarantee normal 80 feather weight hardened and tempered steel plate obdurabilities of Ultra-low carbon and strong plasticity coupling; Mo equivalent=Mo+0.67Cr+0.83Si+1.62V wherein; Cr equivalent=Cr+1.21Mo+Si+1.86V.
Ni/Cu >=0.50 prevents that Cu is crisp, when improving mother metal steel plate low-temperature impact toughness, and the thermal embrittlement again when preventing to weld.
Ca/S is between 1.00～3.00, and (%Ca) * (%S)
0.18≤2.5 * 10
-3To improve steel plate low-temperature flexibility, weldableness, anti-SR fragility, anti-lamellar tearing performance.
Control F * DI index>=1.2 * t guarantees the unit elongation after 80 feather weight ultrahigh-strength steel plates obdurability couplings, low-temperature flexibility and the tempering; Wherein F is a B element hardening capacity contribution factor; When having solid solution [B] in the steel, F gets 1.2; T is Finished Steel plate thickness (mm); DI=0.367 (%C)
0.5[1+0.7 (%Si)] [(1+3.33 (%Mn)] [(1+0.35 (%Cu)] [(1+0.36 (%Ni)] [(1+2.16 (%Cr)] [(1+3 (%Mo)] [(1+1.75 (%V)] [(1+1.77 (%Al)] * 25.4 (mm).
In the composition design of steel of the present invention:
C is very big to intensity, low-temperature flexibility, unit elongation and the weldableness influence of quenched and tempered steel, from low-temperature flexibility, unit elongation and the weldableness angle of improving quenched and tempered steel, hopes that C content is controlled lowlyer in the steel; But microstructures Control and manufacturing cost angle from the intensity of quenched and tempered steel, manufacturing process, C content should not be controlled lowly excessively; When C content is higher, though help improving quenched and tempered steel intensity, damage low-temperature flexibility, unit elongation and the weldableness of quenched and tempered steel, so C content is unsuitable too high.Comprehensive above-mentioned analysis C content range is controlled at 0.05～0.12%.
Mn as most important alloying element in steel except that the intensity that improves quenched and tempered steel, also have the austenite of expansion phase region, reduce Ar
3Point temperature, refinement quenched and tempered steel colony and improve the steel plate low-temperature flexibility effect, promote low temperature phase change tissue to form and the effect of raising quenched and tempered steel intensity; But segregation takes place easily in Mn in the molten steel solidification process, when especially Mn content is higher, not only can cause the pouring operation difficulty, and easily and element generation conjugation segregation phenomenas such as C, P, S; When especially C content was higher in the steel, the segregation that increases the weight of the strand centre was with loose, and serious strand central zone is segregated in and is prone in the follow-up rolling and welding process form abnormal structure, causes hardened and tempered steel plate low-temperature flexibility and unit elongation low; Therefore according to the C content range, select suitable Mn content range extremely necessary for high-strength hardened and tempered steel, composition of steel system and C content are 0.05～0.12% according to the present invention; Being fit to Mn content is 1.20%～1.60%; And when C content was high, Mn content suitably reduced, and vice versa; And when C content hanged down, Mn content suitably improved.
Si promotes deoxidation of molten steel and can improve quenched and tempered steel intensity, still adopts the molten steel of Al deoxidation, and the desoxydatoin of Si is little; Though Si can improve the intensity of steel plate, Si suppresses lower bainite and forms the low-temperature flexibility of heavy damage steel plate, unit elongation and weldableness; Especially under than the large-line energy welding conditions, Si not only promotes the M-A island to form, and comparatively thick, the skewness of M-A island size that forms; The toughness of heavy damage welded heat affecting zone (HAZ); Therefore the Si content in the steel should be controlled lowly as far as possible, considers steel-making cost, and Si content is controlled at below 0.20%.
P is as the mechanical property of detrimental impurity in the steel to quenched and tempered steel, and especially low-temperature impact toughness, unit elongation and weldableness have huge detrimental effect, and it is low more good more to require in theory; But consider steel-making operability, steel-making cost and the smooth and easy principle of logistics, P content need be controlled at≤and 0.013%.
S has very big detrimental effect as detrimental impurity in the steel to the low-temperature flexibility of quenched and tempered steel, the more important thing is that S combines with Mn in steel, forms the MnS inclusion; In course of hot rolling; The plasticity-of MnS makes MnS along rolling to extension, forms along rolling to MnS inclusion band, and the low-temperature impact toughness of heavy damage steel plate, unit elongation, Z are to performance and weldableness; S produces hot short principal element in the course of hot rolling simultaneously, and it is low more good more to require in theory; But consider steel-making operability, steel-making cost and the smooth and easy principle of logistics, S content need be controlled at≤and 0.003%.
Cu also is an austenite stabilizer element, adds Cu and also can reduce Ar
3The point temperature improves the hardening capacity of steel plate and the resistance to atmospheric corrosion of steel plate; But the Cu addition is (being higher than 0.30%) too much, not only causes the hardened and tempered steel plate carbon equivalent to raise, and the more important thing is and cause copper brittleness, casting billet surface be full of cracks, implosion problem to reach especially super-thick steel plate welding joint SR performance degradation easily; The Cu addition is very few, is lower than 0.10%, and institute cuts any ice very little; Therefore Cu content is controlled between 0.10%～0.30%; Cu, the compound interpolation of Ni except that the copper brittleness phenomenon that reduces Copper Bearing Steel, alleviate the effect of intergranular cracking of course of hot rolling, the more important thing is that Cu, Ni are austenite stabilizer element, Cu, the compound interpolation of Ni can reduce Ar significantly
3, improve the motivating force of austenite to ferrite transformation, cause martensite/lath of bainite can be to each position to growing up, cause that the position becomes big to difference between martensite/lath of bainite, increase the resistance that crackle passes martensite/lath of bainite.
Add Ni and can promote that not only dislocation is handed over slippage in the ferritic phase, improve the dislocation mobility, and increase between martensite/lath of bainite the position to poor; Ni reduces Ar as austenite stabilizer element
3The point temperature, refinement martensite/bainite colony size, so Ni has the function that improves hardened and tempered steel plate intensity, unit elongation and low-temperature flexibility simultaneously; Add the copper brittleness phenomenon that Ni can also reduce Copper Bearing Steel in the steel, alleviate the intergranular cracking of course of hot rolling, improve the resistance to atmospheric corrosion of steel plate, and Ni is low to the carbon equivalent contribution margin.Therefore theoretically, Ni content is high more within the specific limits good more in the steel, and the welded heat affecting zone but too high Ni content can harden is unfavorable to the weldableness and the welding joint SR performance of steel plate; Simultaneously Ni is a kind of very noble element, considers that from the ratio of performance to price Ni content is controlled between 0.10%～0.40%, does not damage the weldableness of steel plate with the obdurability level of the hardening capacity of guaranteeing steel plate and steel plate.
Cr is as weak carbide forming element; Add hardening capacity, promotion martensite/bainite formation that Cr not only improves steel plate; And the position increases to difference between martensite/lath of bainite; Increase the resistance that crackle passes martensite/bainite colony, when improving armor plate strength, the have some improvement effect of steel plate toughness of tool; Yet when the Cr addition is ultra for a long time, on original austenite crystal prevention, separate out the carbide of thick chain chromium in the drawing process, deterioration hardened and tempered steel plate low-temperature impact toughness the more important thing is the weldableness of heavy damage steel plate; Therefore Cr content is controlled between 0.10%～0.30%.
Add the hardening capacity of Mo raising steel plate; Promote martensite/bainite to form; But Mo is as the strong carbide forming element; When promoting that martensite/bainite forms, the position is very little to difference between the increase martensite/size of bainite colony and the martensite/lath of bainite of formation, reduces the resistance that crackle passes martensite/bainite colony; Therefore Mo has reduced low-temperature flexibility, unit elongation and the weldableness of hardened and tempered steel plate when increasing substantially hardened and tempered steel plate intensity; The more important thing is that the Mo addition surpasses at 0.30% o'clock, increases considerably the manufacturing cost of hardened and tempered steel plate.Therefore the phase transformation strengthening effect of taking all factors into consideration Mo reaches the influence to mother metal steel plate low-temperature flexibility, unit elongation, weldableness and manufacturing cost, and the present invention adopts ultralow Mo alloying, and Mo content is controlled at 0.05%～0.30%.
B content is controlled between 0.0006%～0.0013%, when guaranteeing hardened and tempered steel plate hardening capacity, does not damage the weldableness and the HAZ toughness of steel plate.
Ti content is between 0.005%～0.011%, and austenite crystal is grown up in the heating of inhibition slab, the course of hot rolling, improves the hardened and tempered steel plate low-temperature flexibility, the more important thing is and suppresses HAZ grain growth in the welding process, improves HAZ toughness; Ti content surpasses at 0.011% o'clock in addition, and the TiN particle of formation is not only more but also comparatively thick, has the ferritic of promotion and forms, and has a strong impact on the hardening capacity in hardened and tempered steel plate centre.
Als in the steel is the freedom [N] in the steel fixedly, reduces welded heat affecting zone (HAZ) free [N], improve the low-temperature flexibility effect of welded H AZ, so the Als lower limit is controlled at 0.035%; Not only can cause the casting difficulty but add excessive Als in the steel, and can in steel, form the needle-like Al of a large amount of disperses
2O
3Inclusion, infringement steel plate endoplasm viability, low-temperature flexibility and weldableness, so the Als upper limit is controlled at 0.065%.
The span of control of N is corresponding with the span of control of Ti, and for the hardened and tempered steel plate of superior weldability, N content is low excessively, and generation TiN number of particles is few, size is big, can not play the effect of the weldableness of improving quenched and tempered steel, and is harmful to weldableness on the contrary; But during the N too high levels, free [N] increases in the steel, and heat affected zone (HAZ) free [N] content increases, heavy damage HAZ low-temperature flexibility, the weldableness of deterioration quenched and tempered steel.Therefore N content is controlled at below 0.0060%.
V content is between 0.015%～0.045%, and along with the increase of steel plate thickness, V content is the capping value suitably.Adding the V purpose is that (C N) separates out in the bainite/martensite lath, improves the intensity of hardened and tempered steel plate through V.V adds very few, is lower than 0.015%, and (C N) very little, can not effectively improve the intensity of hardened and tempered steel plate to the V that separates out; The V addition is too much, is higher than 0.045%, infringement hardened and tempered steel plate low-temperature flexibility, unit elongation and weldableness.
Steel is carried out Ca to be handled; On the one hand can further pure molten steel; On the other hand sulfide in the steel is carried out denaturing treatment, make it to become non deformable, stablize tiny spherical sulfide, suppress S red brittleness, improve steel low-temperature flexibility, unit elongation and Z to performance, improve steel plate flexible anisotropy.What of Ca add-on are depended on the height of S content in the steel, and the Ca add-on is low excessively, and treatment effect is little; The Ca add-on is too high, and (O, S) oversize, fragility also increases, and can become the fracture crack starting point, reduces the low-temperature flexibility and the unit elongation of steel, also reduces purity of steel simultaneously, pollutes molten steel to form Ca.General control Ca content is pressed ESSP=(wt%Ca) [1-1.24 (wt%O)]/1.25 (wt%S), and wherein ESSP is a sulfide inclusion shape control index, be advisable between the span 0.5～5, so the OK range of Ca content is 0.0010%～0.0040%.
The method of manufacture of low-carbon-equivalent 80 feather weight high-performance hardened and tempered steel plates of the present invention, it comprises the steps:
1) smelts, casts
Smelt according to mentioned component, be cast into slab; Low temperature casting in the casting employing, pouring temperature is controlled between 1530～1560 ℃, and the pure Ar time >=2min that blows of ladle before the casting, and the calm time >=2min of ladle guarantees the inclusion floating removal;
2) rolling
Slab heating, heating and temperature control between 1050～1150 ℃, soaking time 3～6 hours, when guaranteeing the inner segregation even diffusedization of the solid solution of slab microalloy carbonitride, slab, original austenite grains is within reason grows up;
Fs is common rolling, adopts the milling train maximum capacity to carry out continuous rolling incessantly; Guarantee that refine austenite crystal grain takes place dynamically/static recrystallize the deformation metal;
Subordinate phase adopts the recrystallize controlled rolling, 900～950 ℃ of start rolling temperatures, rolling pass draft >=8%, accumulative total draft >=50%, 800～850 ℃ of finishing temperatures;
3) cooling
Thickness≤40mm steel plate, rolling back natural air cooling is to room temperature; Finished Steel plate thickness＞40mm adopts the slow cooling dehydrogenating technology, and retarded cooling process is that steel plate is being incubated 24 hours more than 300 ℃ at least;
4) thermal treatment
Quench, the steel plate quenching temperature is that the plate temperature is 880～920 ℃, the hold-time >=15min that quenches, the soaking time that the hold-time of quenching picks up counting when reaching the quenching target temperature for the steel plate core temperature;
Tempering, steel plate tempering temperature are that the plate temperature is 530～630 ℃, tempering hold-time >=25min, the soaking time that the tempering hold-time picks up counting when reaching the tempering target temperature for the steel plate core temperature.
Beneficial effect of the present invention:
The present invention combines with special hardening and tempering process (RCR+QT) through the unitized design of steel plate alloying element; Obtaining excellent low-temperature flexibility, HS (in tensile strength >=780MPa), the unit elongation δ 5 >=15%; Steel plate has ultralow carbon equivalent Ceq; Good weldableness the more important thing is and realized the low-cost manufacturing of quenching and tempering, high plate, low welding processing cost of manufacture; And the comprehensive mechanical property that has successfully solved high-strength hardened and tempered steel plate conflicts in composition design, technological design with manufacturing cost, welding processing cost of manufacture each other, the very difficult problem that is in harmonious proportion; The more important thing is that manufacturing cost is cheap relatively; The high-strength hardened and tempered steel plate of 80 feather weight of characteristic good is promoted to the popularization of industries such as the engineering machinery that has a large capacity and a wide range, bridge structure, automotive industry and transportation by railroad greatly, accelerated the upgrading that these industries are used; In addition; Good weldableness; Realized that the high-strength hardened and tempered steel plate without preheating welding of 80 feather weight, postwelding do not have the heat treatment process manufacture craft, saved the cost that user's steel member is made, shortened the time that user's steel member is made; For the user has created huge value, thereby this type of steel plate is not only the product of high added value, green environmental protection.
Description of drawings
Fig. 1 is the microstructure of the embodiment of the invention 3 steel.
Embodiment
Below in conjunction with embodiment the present invention is further specified.
Table 1 is depicted as the composition of embodiment of the invention steel, and table 2 is the ME of embodiment of the invention steel.Table 3, table 4 are the performance of embodiment of the invention steel.
Can find out that from Fig. 1 and table 3, table 4 microstructure of steel plate of the present invention is tiny tempered martensite+tempering lower bainite, average colony size obtains evenly good obdurability below 25 μ m.
In sum; The present invention combines with special hardening and tempering process (RCR+QT) through the unitized design of steel plate alloying element; When obtaining good mother metal steel plate low-temperature flexibility, HS and weldableness at the same time; Steel plate cheap for manufacturing cost, and the problem that is in harmonious proportion is conflicted, is difficult to the over-all properties that has successfully solved high-strength hardened and tempered steel plate each other in composition design, technological design with manufacturing cost; And since cheap for manufacturing cost, high-strength hardened and tempered steel plate is promoted to industries such as the engineering machinery that has a large capacity and a wide range, bridge structure, automotive industry and transportation by railroads promoted greatly, accelerated the upgrading that these industries are used; In addition, cheap steel plate manufacturing cost and good weldableness have been saved the cost that user's steel member is made, and have shortened the time that user's steel member is made, and for the user has created huge value, thereby this type of steel plate is not only the product of high added value, green environmental protection.
80 feather weight hardened and tempered steel plates are critical materials that industries such as engineering machinery, mining machinery, heavy equipment framework, bridge structure, automotive industry and transportation by railroad update; But the general manufacturing cost of 80 feather weight quenched and tempered steel of HS, H.T. and superior weldability is expensive; Be difficult to promote to industries such as the engineering machinery that has a large capacity and a wide range, mining machinery, heavy equipment framework, bridge structure, automotive industry and transportation by railroads; 80 feather weight hardened and tempered steel plates use in these industries and receive great restriction, have influenced these industry Equipment Design and the employing of making update and new technology, novel process.Along with the Chinese national economy development, the requirement of building saving, environmentally friendly harmonious society reduces resource consumption, improves resource utilization and has put day thing agenda.
The present invention's 80 feather weight high-performance hardened and tempered steel plates are widely used these industries; Not only can reduce the steel usage quantity significantly; Reduce the per GDP consumed resource; And reduce processing, Production Time and cost, and the more important thing is that the use of these high performance materials is accelerated to promote China's weight equipment production scientific-technical progress, promote whole industry international competitiveness.
Claims (2)
1. low-carbon-equivalent 80 feather weight high-performance hardened and tempered steel plates, its composition weight percent is:
C：0.05％～0.12％
Si：≤0.20％
Mn：1.20％～1.60％
P：≤0.013％
S：≤0.003％
Cu：0.10％～0.30％
Ni：0.10％～0.40％
Cr：0.10％～0.30％
Mo：0.05％～0.30％
Als：0.035％～0.065％
Ti：0.005％～0.011％
V：0.015％～0.045％
N：≤0.0060％
Ca：0.001％～0.004％
B：0.0006％～0.0013％
All the other are iron and unavoidable impurities;
And above-mentioned constituent content must satisfy following relation simultaneously:
Mn/C≥12；
Als≥12×[(％N
total)-0.292(％Ti)]；
Control Ceq≤0.43%;
(％Si)×(％C)≤0.012；
Mo equivalent >=0.30%, Cr equivalent >=0.40%; Mo equivalent=Mo+0.67Cr+0.83Si+1.62V wherein; Cr equivalent=Cr+1.21Mo+Si+1.86V;
Ni/Cu≥0.50；
Ca/S is between 1.00～3.00, and (%Ca) * (%S)
0.18≤2.5 * 10
-3
Control F * DI index>=1.2 * t, wherein F is a B element hardening capacity contribution factor; When having solid solution [B] in the steel, F gets 1.2; T is the Finished Steel plate thickness, the mm of unit; DI=0.367 (%C)
0.5[1+0.7 (%Si)] [(1+3.33 (%Mn)] [(1+0.35 (%Cu)] [(1+0.36 (%Ni)] [(1+2.16 (%Cr)] [(1+3 (%Mo)] [(1+1.75 (%V)] [(1+1.77 (%Al)] * 25.4, the mm of unit.
2. the method for manufacture of low-carbon-equivalent 80 feather weight high-performance hardened and tempered steel plates, it comprises the steps:
1) smelts, casts
Smelt according to mentioned component, be cast into slab; Low temperature casting in the casting employing, pouring temperature is controlled between 1530～1560 ℃, and the pure Ar time >=2min that blows of ladle before the casting, and the calm time >=2min of ladle guarantees the inclusion floating removal;
2) rolling
Slab heating, heating and temperature control between 1050～1150 ℃, soaking time 3～6 hours;
Fs is common rolling, adopts the milling train maximum capacity to carry out continuous rolling incessantly;
Subordinate phase adopts the recrystallize controlled rolling, 900～950 ℃ of start rolling temperatures, rolling pass draft >=8%, accumulative total draft >=50%, 800～850 ℃ of finishing temperatures;
3) cooling
Thickness≤40mm steel plate, rolling back natural air cooling is to room temperature; Finished Steel plate thickness＞40mm adopts the slow cooling dehydrogenating technology, and retarded cooling process is that steel plate is being incubated 24 hours more than 300 ℃ at least;
4) thermal treatment
Quench, the steel plate quenching temperature is that the plate temperature is 880～920 ℃, the hold-time >=15min that quenches, the soaking time that the hold-time of quenching picks up counting when reaching the quenching target temperature for the steel plate core temperature;
Tempering, steel plate tempering temperature are that the plate temperature is 530～630 ℃, tempering hold-time >=25min, the soaking time that the tempering hold-time picks up counting when reaching the tempering target temperature for the steel plate core temperature.
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| CN110952040A (en) * | 2019-11-25 | 2020-04-03 | 南京钢铁股份有限公司 | Production method of EH460 grade 150-inch thick steel plate with thickness of 200mm |
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