CN102953012A - Ultrahigh-strength welding structure steel plate and its manufacturing method - Google Patents
Ultrahigh-strength welding structure steel plate and its manufacturing method Download PDFInfo
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- CN102953012A CN102953012A CN2011102419730A CN201110241973A CN102953012A CN 102953012 A CN102953012 A CN 102953012A CN 2011102419730 A CN2011102419730 A CN 2011102419730A CN 201110241973 A CN201110241973 A CN 201110241973A CN 102953012 A CN102953012 A CN 102953012A
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Abstract
The invention discloses an ultrahigh-strength welding structure steel plate. The steel plate comprises 0.11-0.19% of C, 0.20-0.50% of Si, 0.90-1.40% of Mn, 0.005-0.030% of Ti, 0.30-1.00% of Cr, 0.1-0.5% of Cu, 0.15-0.35% of Ni, 0.15-0.60% of Mo, 0.010-0.050% of Als, 0.020% or less of P, 0.010% or less of S, 0.025-0.070% of V, 0.005% or less of Zr, and the balance Fe and inevitable impurities. Quenching and tempering treatments of the steel plate are carried out after rolling, the reheating temperature is 860-930DEG C, the temperature insulation is carried out for 1.0-2.5min/mm, and water quenching is carried out to obtain a quenching martensite structure; and a tempering treatment is carried out at 500-600DEG C, the heat insulation time is 1.0-3.0min/mm, and air cooling is carried out.
Description
Technical field
The invention belongs to metal material field, be specifically related to a kind of yield strength 900MPa above superstrength steel for welded structures plate and manufacture method thereof.
Background technology
The development trend of the mechanical manufacturing field such as truck-mounted crane, heavy load truck, truckmounted concrete pump, semitrailer, freight container is to high-parameters, maximization future development at present, therefore use increasing superstrength Welded Structural Steel, its purpose mainly is to alleviate deadweight, improve supporting capacity, save energy.Also require simultaneously ultrahigh-strength steel plates to have that cost is low, welding property good, the low-temperature flexibility high.
There is quenching+tempering (Q+T) the manufacturing side of ultrahigh-strength steel plates, rolls rear direct quenching+tempering (DQ+T), controlled rolling and controlled cooling+tempering (TMCP+T) etc., first method is tradition method commonly used, although rear two kinds of methods have been omitted and have been reheated together operation, still there are the shortcomings such as template control difficulty is large in process cost a little less than the first method energy.The manufacture method of relevant yield strength 900～1050MPa ultrahigh-strength steel plates has formed multinomial patent in the world.For example: " superhigh strength steel plate with yield strength more than 960 Mpa and manufacture method thereof " (application number 200510024775.3) patent of Baoshan Iron ﹠ Steel Co., Ltd's application provides a kind of yield strength can reach the above ultrahigh-strength steel plates of 96OMPa, (weight percent): C0.08%～0.18% in its composition, Nb0.01%～0.1%.Its production method: with heating steel billet to 1100～1250 ℃, at austenite the recrystallization zone can occur billet rolling is become steel plate; At austenite the steel plate that the recrystallization zone becomes steel plate rolling final thickness does not occur, 860～920 ℃ of finishing temperatures; Steel plate is cooled to is lower than MS～MS+100 ℃ cooling termination temperature to be not less than approximately the speed of cooling of 5 ℃/S; Cooled steel plate is carried out tempering to improve performance.Its technique belongs to DQ+T, and contain 0.0008%～0.0025% B element in the steel, although the product intensity that adopts the method to produce is easy to reach requirement, but there are the weak points such as thin specification template control difficulty is large, low-temperature flexibility is poor, the ballistic work of thickness 16mm steel plate-20 ℃ only 35～50J, ballistic work 30～42J only of-40 ℃ in the embodiment.Be in " yield strength 960MPa Welded Structural Steel " patent of CN200810197585.5 at wuhan iron ﹠ steel croup co. company application number, its yield strength 960MPa Welded Structural Steel that adopts quenching+tempering (Q+T) method to produce is disclosed, B content 0.0005%～0.002%, the ballistic work AKV (7.5 * 10 * 55mm sample) that B content reaches 0.0005%～0.0032%, 10mm Plate Steel-20 ℃ in the embodiment steel Chemical Composition is up to 60J.The patent of invention of Wuyang Iron ﹠ Steel Co., Ltd. " high tensile steel plate and preparation method thereof " (CN application number 200710193027.7) has provided yield strength 975～990MPa (embodiment level in kind) high tensile steel plate and preparation method thereof, adopt the Q+T processing method, B content reaches 0.0010%～0.0030% in the Chemical Composition of steel plate, toughness is low, Ni content is up to 0.80%～0.90%, and cost is high.-20 ℃ of ballistic work AKV of thickness 12mm high tensile steel plate are 100,89,79J ,-40 ℃ of ballistic work AKV40,50,54J.
By above contrast patent as can be known, the main weak point of the at present existence of the ultrahigh-strength steel plates patent about yield strength 900～1050MPa is: contain the B element in the steel, low-temperature flexibility is poor; Noble element Ni content is high in the steel plate, and the steel grade cost is high.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of superstrength steel for welded structures and manufacturing technology thereof, toughness, plasticity and welding property are good, and yield strength can reach 900～1050MPa.Do not contain the B element in the steel, Ni content is low, and reaches low-temperature flexibility, plasticity and template, the elimination unrelieved stress of improving steel grade, the purpose that reduces the steel grade production cost by Q+T technique.This invention steel grade can be used for the mechanical manufacturing field such as truck-mounted crane, heavy load truck, truckmounted concrete pump, semitrailer, freight container.
One of technical scheme of the present invention is that the chemical component weight per-cent of yield strength 900～1050MPa superstrength steel for welded structures plate is: C 0.11%～0.19%, Si 0.20%～0.50%, Mn 0.90%～1.40%, Ti 0.005%～0.030%, Cr 0.30%～1.00%, Cu 0.1%～0.5%, Ni 0.15%～0.35%, Mo 0.15%～0.60%, Als 0.010%～0.050%, P≤0.020%, S≤0.010%, V 0.025%～0.070%, Zr≤0.005%, surplus are Fe and inevitable impurity.
Another technical scheme of the present invention is the manufacture method of yield strength 900～1050MPa superstrength steel for welded structures plate, comprise following processing step: hot metal pretreatment-converter smelting-refining-continuous casting-rolling, in smelting process: carry out hot metal pretreatment, deep desulfuration; Adopt converter smelting, by top blast or top bottom blowing, control P content; Adopt VD, RH, LF etc. to carry out refining treatment, further desulfurization, degassed, H, O, N content in the control steel, and carry out microalloying; Carry out Ca and process, in conjunction with S content and tap in the steel, feed the Si-Ca line, guarantee Ca/S content Ca/S=0.5～2.0, make sulfide generation nodularization, to improve steel plate ductility, transverse impact merit and cold roll forming performance, reduce the horizontal and vertical poor performance of steel plate; Continuous casting adopts induction stirring, reduces element segregation; The conventional hot rolling of rolling employing.
Rollingly steel plate is carried out quenching+tempering process afterwards, reheat 860～930 ℃ of temperature, shrend behind insulation 1.0～2.5min/mm obtains the quenched martensite tissue; 500～600 ℃ of temper, soaking time is 1.0～3.0min/mm, air cooling.In drawing process, control precipitation strength and martenaging martempering degree, improve simultaneously toughness and the plasticity of steel.
The alloying element Main Function that the present invention selects is:
C: carbon is very large on intensity, toughness, the welding property impact of steel.The weight percent content of C of the present invention is that 0.11%～0.19%, C is the main alloy element that guarantees the hardening capacity of steel, can make steel obtain completely martensitic stucture when shrend.Consider from the intensity aspect, the quenching state of steel is organized as martensite, and C is the main alloying element that guarantees martensite intensity, and for the intensity that guarantees steel quenching+tempering attitude tissue of the present invention reaches 900～1050MPa, the lower limit content of C need to be greater than 0.11%.The C higher limit will prevent that the intensity of steel and carbon equivalent are too high, in order to avoid high-temperature resistant tempered ability and the welding property of the toughness of steel, plasticity, steel had a negative impact.On the basis that guarantees necessary hardening capacity and intensity, the C amount is too much unsuitable, therefore is defined as 0.19% on the weight percent content with C.
Si: silicon is the bioelement of deoxidation in steel making, also has certain strengthening effect, when content is lower than 0.2%, smelts difficulty and increases; When content surpassed 0.5%, the degree of cleaning of steel descended, toughness drop, and weldability is poor, and Si can promote the development of temper brittleness, makes the Plasticity Decreasing of steel.Therefore control Si0.20%～0.50%.
Mn: manganese is solution strengthening element important in the steel, but the intensity of Effective Raise steel and toughness, and cost is very cheap, can improve the hardening capacity of steel.But when the Mn too high levels, then cause hardening capacity and toughness drop, increase simultaneously superheated susceptivity (coarse-grain), the enhancing temper brittleness of steel, and easily form band shape and fibrous tissue, make the vertical, horizontal poor performance of steel larger.Therefore in the present invention the Mn element as main alloy element, control its weight percent content 0.90%～1.40%.
B: the boron (0.0005%～0.005%) that adds trace in the steel can significantly improve the hardening capacity of steel, can replace the noble elements such as Ni, Cr, Mo to a certain extent, reduce the cost of alloy of steel, but it has obvious disadvantageous effect to steel grade toughness, plasticity, cold roll forming performance, so stops to add the B element in the steel of the present invention.
Ti: the titanium that adds trace, in order to utilize the nitrogen element in the steel, in the best condition, titanium, nitrogen form the titanium nitride particle, thereby anchoring crystal boundary and prevent that austenite crystal from excessively growing up in heat-processed stops steel billet the growing up of crystal grain in heating, rolling, welding process, improves the toughness of mother metal and welded heat affecting zone, for obtaining tiny quenching structure, thereby the intensity and the toughness that improve steel are favourable.When titanium was lower than 0.005%, nitrogen fixation effect was poor, and when surpassing 0.03%, nitrogen fixation effect reaches capacity, and superfluous titanium will make the toughness of steel worsen.
Als: aluminium is deoxidant element, can be used as the AlN forming element, crystal grain thinning effectively, and when it contained quantity not sufficient 0.01%, effect was less; When surpassing 0.05%, it is saturated that desoxydatoin is tending towards, and increases steel inclusion, harmful to mother metal and welding heat influence area toughness.Therefore control Als0.010%～0.050%.
Mo: molybdenum is present in the sosoloid and carbide of steel, and solution strengthening and Grain refinement are arranged, and can improve the hardening capacity of steel, reduces the overheated proneness of steel, improves intensity, hardness, thermostability.Molybdenum reduces the temper brittleness of steel.But too much molybdenum can damage the toughness of welded heat affecting zone, reduces the weldability of steel.Because its cost is high, the weight percent content that the present invention controls Mo is 0.15%～0.60%.
Cu: as alloying element, can improve austenitic stability in the steel, so can improve the hardening capacity of steel.Except increasing hardness of steel, also help and obtain good low-temperature flexibility, can suppress the generation of hydrogen embrittlement, and micro-Zr adds simultaneously, effect is better.But when Cu＞0.2%, because selective oxidation occurs on the surface, make Fe prior to Cu oxidation occur in heat-processed, and top layer Cu content is relatively to increase to form thin film, then diffuse to form to crystal boundary and contain the Cu network, at 1030 ℃ of rolling surface cracks that namely easily produce.Must add in right amount Ni, generate the higher Cu-Ni sosoloid of fusing point, to reduce " copper brittleness ".The weight percent content that the present invention controls Cu is 0.1%～0.5%.
Ni: nickel can improve the intensity of steel, and makes steel keep good plasticity and low-temperature flexibility.The purpose of adding in the present invention the Ni element mainly is the tendency that stops the steel billet contain Cu to crack when heating or hot rolling.But Ni is too high will greatly to increase the cost of alloy of steel.Consider economy, in the present invention Ni content is controlled at 0.15%～0.50%, the actual Ni content in the steel is decided according to Cu content, guarantees Ni/Cu 〉=0.5.
Cr: chromium is the important interpolation element in the steel of the present invention, can increase the hardening capacity of steel.Cr is medium carbide forming element, and in all various carbide, chromium carbide is the most tiny a kind of, and it can be evenly distributed in the steel volume, makes steel have high intensity, hardness, yield-point and high wear resistance.Because it can make structure refinement and evenly distribute, thus plasticity, toughness might as well, but Cr is little to the effect of the high-temperature resistant tempered ability that improves steel.Consider from aspects such as economy, welding property and intensity, in the present invention Cr content is controlled at 0.30%～1.00%.
V: solid solution can improve the hardening capacity of steel in austenite, increases the temper resistance of steel and strong secondary hardening effect is arranged.Vanadium can improve creep and the creep rupture strength of steel by the disperse distribution of tiny carbide particle.Grain refinement is strong, can improve intensity and the toughness of steel, reduces superheated susceptivity, improves thermostability, when the V amount is not high, also can reduce temper brittleness.In the present invention V content is controlled at 0.025%～0.070%.
Zr: in steel, add a small amount of zirconium, have the effect of degassed, purification and crystal grain thinning, favourable to the low-temperature flexibility of steel, and can eliminate aging phenomenon, improve the punching performance of steel.Add simultaneously with Cu, effect is better.As the element that selectivity of the present invention is added, by weight percentage, control Zr content is≤0.005%.
The upper limit of the impurity element in the steel is controlled at P≤0.02%, and S≤0.01% is advisable, and content is lower, and the steel grade performance is better.
Steel grades design of the present invention does not contain the B element, and the addition of C, Mn element and Cu, Cr, Mo, the polynary a small amount of combination of V element are to improve hardening capacity, and Ni content is lower, has reduced production cost; Can obtain that toughness, plasticity are good, other superstrength steel for welded structures plate of yield strength 900～1050MPa level, and-20 ℃ of AKV2 can reach more than the 100J, and compared steel-20 ℃ AKV2 is only below 47J.
Embodiment
The present invention is further described below in conjunction with embodiment:
According to chemical composition of the present invention and production technique, smelt rolling steel grade of the present invention and contrast steel grade pragmatize and study minute such as table 1, table 2, each embodiment of invention steel carries out hot metal pretreatment, deep desulfuration; Adopt converter smelting, by top blast or top bottom blowing, control P content; Adopt VD, RH, LF etc. to carry out refining treatment, further desulfurization, degassed, H, O, N content in the control steel, and carry out microalloying; Carry out Ca and process, in conjunction with S content and tap in the steel, feed the Si-Ca line, guarantee Ca/S content Ca/S=0.5～2.0, make sulfide generation nodularization, to improve steel plate ductility, transverse impact merit and cold roll forming performance, reduce the horizontal and vertical poor performance of steel plate; Continuous casting adopts induction stirring, reduces element segregation; The conventional hot rolling of rolling employing, 1000～1250 ℃ of Heating temperatures, rear air cooling is rolled in finishing temperature＞780 ℃.
Then steel plate is carried out quenching+tempering and process, reheat 860～930 ℃ of temperature, shrend behind insulation 1.0～2.5min/mm obtains the quenched martensite tissue; 500～600 ℃ of temper, soaking time is 1.0～3.0min/mm, air cooling.
Steel grade of the present invention and contrast steel grade object performance assay such as table 3, table 4.
The smelting composition example of table 1, steel grade of the present invention, Wt%
The smelting composition example of table 2, contrast steel grade, Wt%
Table 3, steel example thermal treatment process of the present invention and actual mechanical property
Table 4, compared steel example thermal treatment process and actual mechanical property
By Data Comparison in the table as seen, in the situation that have the equality strength level, the invention steel has extraordinary low-temperature impact toughness, and-20 ℃ of AKV2 can reach more than the 100J, and compared steel-20 ℃ AKV2 is only below 47J.Generally speaking, the plasticity A of invention steel, Z also mostly are better than the contrast steel grade.
Claims (2)
1. superstrength steel for welded structures plate, it is characterized in that chemical component weight per-cent is: C 0.11%～0.19%, Si 0.20%～0.50%, Mn 0.90%～1.40%, Ti 0.005%～0.030%, Cr 0.30%～1.00%, Cu 0.1%～0.5%, Ni 0.15%～0.35%, Mo 0.15%～0.60%, Als 0.010%～0.050%, P≤0.020%, S≤0.010%, V 0.025%～0.070%, Zr≤0.005%, surplus are Fe and inevitable impurity.
2. manufacture method of described superstrength steel for welded structures plate according to claim 1 and 2, comprise hot metal pretreatment-converter smelting-refining-continuous casting-rolling, it is characterized in that: rollingly steel plate is carried out quenching+tempering process afterwards, reheat 860～930 ℃ of temperature, shrend behind insulation 1.0～2.5min/mm obtains the quenched martensite tissue; 500～600 ℃ of temper, soaking time is 1.0～3.0min/mm, air cooling.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108517472A (en) * | 2018-03-30 | 2018-09-11 | 江苏沙钢集团淮钢特钢股份有限公司 | The pressure pump valve special-purpose steel and its production technology of shale gas exploitation fracturing unit truck |
| CN110629119A (en) * | 2019-10-31 | 2019-12-31 | 武汉钢铁有限公司 | Spring flat steel and manufacturing process thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101935810A (en) * | 2010-08-06 | 2011-01-05 | 莱芜钢铁股份有限公司 | Method for manufacturing low-cost super-high intensity steel plate with yield strength of over 960 MPa for wide process operation window |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101935810A (en) * | 2010-08-06 | 2011-01-05 | 莱芜钢铁股份有限公司 | Method for manufacturing low-cost super-high intensity steel plate with yield strength of over 960 MPa for wide process operation window |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108517472A (en) * | 2018-03-30 | 2018-09-11 | 江苏沙钢集团淮钢特钢股份有限公司 | The pressure pump valve special-purpose steel and its production technology of shale gas exploitation fracturing unit truck |
| CN108517472B (en) * | 2018-03-30 | 2019-06-07 | 江苏利淮钢铁有限公司 | The pressure pump valve special-purpose steel and its production technology of shale gas exploitation fracturing unit truck |
| CN110629119A (en) * | 2019-10-31 | 2019-12-31 | 武汉钢铁有限公司 | Spring flat steel and manufacturing process thereof |
| CN110629119B (en) * | 2019-10-31 | 2021-10-01 | 武汉钢铁有限公司 | Spring flat steel and manufacturing process thereof |
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Application publication date: 20130306 |