CN101906594B - 900MPa level yield strength quenched and tempered steel plate and manufacturing method thereof - Google Patents
900MPa level yield strength quenched and tempered steel plate and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a 900MPa level yield strength quenched and tempered steel plate and a manufacturing method thereof. The chemical composition comprises the following components by the weight percent: 0.15% to 0.25% of C, 0.15% to 0.35% of Si, 0.75% to 1.60% of Mn, no more than 0.020% of P, no more than 0.020% of S, 0.08% to 0.30% of Ni, 0.20% to 0.60% of Cu, 0.30% to 1.00% of Cr, 0.10% to 0.30% of Mo, 0.015% to 0.045% of Als, 0.001% to 0.003% of B and the rest of Fe and inevitable impurities. The steel is uniformly heated at the temperature of 1220 to 1250 DEG C, is rolled with the finishing temperature more than 850 DEG C and is carried out air cooling after rolling. Quenching and heating temperature is 860 to 910 DEG C, the temperature is kept for 5 to 60 min and water quench is carried out, and the steel is tempered at the temperature of 420 to 540 DEG C to obtain tempered martensite structure. Rel of the steel is more no less than 900 MPa, A is no less than 15% (vertical direciton), -40 DEG C AKv is no less than 21J (vertical direction), carbon equivalent is less than 0.60%, and the invention has good welding performance. The invention has the characteristics of high strength, high tenacity, good welding and low cost.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, relate to a kind of product and production method of steel, specifically is a kind of 900MPa level yield strength quenched and tempered steel plate and manufacture method thereof.
Background technology
The history of the Application and Development of high-strength quenched and tempered steel existing decades owing to have high strength, high reliability and characteristics such as can weld, is widely used in the important structure part of all kinds of machineries, building, vehicle, boats and ships.In order to satisfy its maximization, light-weighted demand for development, quenched and tempered steel is towards higher intensity rank development.
Increasing heavy construction structure has proposed to upgrade higher requirement to the stability of plate property, this just requires steel plate that good stable original structure is arranged, guarantee that tissue is stable, then low-alloy quenched and tempered steel should be first-selected, because the development trend of iron and steel is that the simple engineering project of moulding and working conditions is generally selected the controlled rolling low-alloy high-strength steel for use recently; But controlled rolling soft steel is repeating to organize malleable after the heating, and the low-alloy quenching and tempering, high is repeating to heat, under the condition of any complexity such as distortion, cooling, organizing all relatively stablely, the final use properties of steel plate is had preferably guarantee.
It is higher and weld shortcomings such as undesirable that tradition quenched and tempered steel has cost that high-carbon quantity, high alloy composition and carbon equivalent high bring.
For example " easy-weld hardening high-strength steel plate and production method thereof " (publication number: CN200610018011.8) C in the patent :≤0.15%, Si:0.15～0.50%, Mn:0.80～1.80%, P :≤0.020%, S :≤0.010%, Ni :≤1.20%, Cr :≤0.80%, Mo :≤0.60%, Nb :≤0.07%, B :≤0.003%, Ti :≤0.03%, V :≤0.08%, surplus is Fe and unavoidable impurities.Alloy in its composition mentality of designing is very high, does not have advantage on the cost.Its design quenching temperature is 930-950 ℃, and tempering temperature is 580-670 ℃, finally is organized as tempered sorbite.The yield strength of steel plate only 〉=795MPa, tensile strength 〉=830MPa, A 〉=14% (vertically) ,-20 ℃ of AKv 〉=34J (vertically).Its reheat austenitic temperature is higher, can not obtain tiny original austenite grains, and its yield strength is on the low side, can not satisfy light-weighted demand for development.
" a kind of low-alloy super-strength steel and thermal treatment process thereof " (publication number: CN200610046693.3), C:0.3～0.6%, Si:0.1～0.4%, Mn:0.8～2.0%, P :≤0.01%, S :≤0.01%, Cr:0.80～2.00%, Mo:0.10～0.40%, Al:1.0～2.5%, surplus is Fe and unavoidable impurities.Its high-carbon content welds undesirable.
As mentioned above, desired yield strength more than 900MPa, high tenacity, also have the steel plate of good welding property and relative cheap cost concurrently, the past does not also have production technology preferably.
Summary of the invention
The present invention discloses a kind of 900MPa of having level yield strength quenched and tempered steel plate and manufacture method.Make this steel plate under prerequisite, also have good welding property and relative cheap cost characteristics concurrently with high strength, high tenacity performance.
Its chemical composition of the present invention is weight percent proportioning: C:0.15%～0.25%, Si:0.15%～0.35%, Mn:0.75%～1.60%, P :≤0.020%, S :≤0.020%, Ni:0.08%～0.30%, Cu:0.20%～0.60%, Cr:0.30%～1.00%, Mo:0.10%～0.30%, Als:0.015%～0.045%, B:0.001%～0.003%, surplus are Fe and unavoidable impurities.
The present invention on the mentioned component basis, can add trace element such as Nb, Ti, V one or two or more kinds, total amount is no more than 0.22%.
The manufacture method of this steel plate is:
To smelt by said ratio, and carry out soaking under 1220～1250 ℃, rolling then, finishing temperature is rolled the back air cooling greater than 850 ℃; Heating temperature is 860～910 ℃ during modifier treatment, and 420～540 ℃ of tempering are carried out in shrend behind insulation 5～60min again, and furnace cooling is to room temperature.
The present invention adopts suitable carbon content to cause strain cracking to reduce shrend, lower carbon equivalent and alloy content guaranteed that steel plate has the present invention of good welds performance and adopts multiple reinforcement means simultaneously, improve the obdurability of material, with the content of suitable C, Cr, Mo, B, obtain best phase transformation strengthening effect; Suitable adding Nb, Ti, Cu add an amount of Al crystal grain thinning to reach the effect of dispersion-strengthened, precipitation strength, add the toughness that an amount of Ni improves material; (420～540 ℃ of control Heating temperature (1220～1250 ℃), finishing temperature (greater than 850 ℃), reheat austenitizing temperature (860-910 ℃), tempering temperature and soaking times, shrend behind insulation 5～60min), obtain tiny original austenite grain, the precipitated phase that small and dispersed distributes is to reach the highly malleablized effect.
According to chemical ingredients and the thermal treatment process of above the present invention, can produce the 900MPa level yield strength quenched and tempered steel plate by balanced control steel.
The selection characteristics of element of the present invention are
C is in order to alleviate the cracking sensitivity of shrend, and by weight percentage, the carbon content maximum should not surpass 0.30%, but the C element is a strengthening element, and carbon content is on the low side will damage the intensity of material, and the selection carbon content is 0.15～0.25%.The development of high-strength steel is the process that progressively reduces carbon content, and the reduction of carbon content helps improving toughness on the one hand, can significantly improve the steel plate welding property simultaneously.
The Si strengthening element, solid solution is lower than 0.15% in the yield strength of ferrite raising steel, can increase the steel making working procedure cost.Be higher than 0.35%, in this composition combination, easily make slab produce the regeneration iron sheet that is difficult to remove, influence the surface quality of finished product steel plate.Therefore determine that its scope is 0.15%～0.35%.
Mn mainly is dissolved in ferrite and plays strengthening effect, improves the hardening capacity of steel, is again the element that certainly exists when smelting in the steel.Determine its content range according to the intensity rank level that will reach, but make it be lower than 0.15% pair of smelting requirements height, increase cost.But content too Gao Shiyi causes segregation, determines that therefore its scope is 0.75%～1.60%.
P is easy to cause segregation, and is unfavorable to weldability and processability.For guaranteeing weldability and processability requirement, the present invention controls it and is lower than 0.020%.
S is a harmful element, on mechanical property, is low more good more naturally, increases but cross the low process cost that can cause, and the present invention controls it and is lower than 0.020%.
Ni is a precious metal element, improves the hardening capacity element, improves the intensity of steel and does not reduce its toughness, and its scope that plays obvious corrosion-resistant effect is more than 1.0%, suitably add this element mainly also can take precautions against the slab heating time surface C u split phenomenon.For controlling cost, limiting its scope is 0.08%～0.30%.
Cu has good result for improving solidity to corrosion, and necessary content is 0.20%, but content surpasses 0.60%, and its effect reaches capacity, and therefore limiting its scope is 0.20%～0.60%.
Cr improves the hardening capacity element strongly, and the strong carbide forming element is used the solidity to corrosion that improves steel with Cu, and necessary amount is 0.30%, and therefore limiting its content range is 0.30%～1.00%.
Mo improves the hardening capacity element, and the strong carbide forming element can improve the temper resistance of steel effectively, owing to cost an arm and a leg, content is unsuitable too high, and therefore limiting its content range is 0.10～0.30%.
With B instead of part Mo, suitably reduce tempering temperature and ensure intensity, also can further reduce cost.
The nitrogen killer that Als is traditional, forming AlN can refine austenite crystal grain, and therefore limiting its content range is 0.015%～0.045%.
The strong carbonitride forming element of Ti forms TiN, TiC and all can stop austenite crystal to grow up refine austenite crystal grain in soaking and reheat process.Should limit its content range is 0.010%～0.050%.
Can postpone austenite recrystallization during the Nb hot rolling and reach the purpose of crystal grain thinning, in postcooling and course of hot rolling, the NbCN disperse is separated out, and plays the precipitation strength effect, improves intensity.In the reheat process, stop austenite crystal to be grown up.Because Nb content reaches crystal grain thinning effect in 0.07% o'clock and reaches capacity.So limit its upper content limit is 0.07%, and scope is 0.01%～0.07%.
Process characteristic of the present invention is that Heating temperature is limited to 1230 ± 20 ℃, is rolled in austenite recrystallization district and non-recrystallization zone, and 1210 ℃ is necessary temperature, and surpasses 1250 ℃, and energy consumption raises, and the oxidational losses of steel billet is big.So determine that Heating temperature is 1230 ± 20 ℃.
Start rolling temperature is limited to more than 1200 ℃, and the plasticity of steel is good, and intensity is low, is easy to rollingly, and base can not cause size bad and shape defects such as nose, wooden dipper song take place influence normally carrying out of step operation down because of the temperature difference end to end.
Finishing temperature is rolled the back air cooling greater than 850 ℃; When finishing temperature was lower than 850 ℃, the load of milling train can increase, and finishing temperature is higher than 950 ℃, and the grain refining deficiency influences strengthening effect, and the transverse and longitudinal poor performance mutation of steel plate is big.So finishing temperature of the present invention is controlled at 850～950 ℃.
Heating temperature is 860～910 ℃ during modifier treatment of the present invention, and 420～540 ℃ of tempering are carried out in shrend behind insulation 5～60min again, obtain tempered martensite.Heating temperature is greater than 910 ℃, and austenitic temperature is higher, can not obtain tiny original austenite grains, is unfavorable for weldprocedure; Tempering temperature can not get tempered martensite greater than 550 ℃, and yield strength does not reach the 900MPa rank.
The steel of composition of the present invention has been realized lower carbon equivalent and design of alloy, and in strictness control slab heating temperature, rolling and cooling parameter, the product that steel plate processing condition such as after modifier treatment are produced, both can satisfy every mechanical performance index, can reduce cost again, have good welding property simultaneously.Reached Rel 〉=900MPa, A 〉=15% (vertically) through check steel plate of the present invention.-40 ℃ of AKv 〉=21J (vertically), carbon equivalent has good welding property less than 0.60% simultaneously.Steel of the present invention has high strength, high tenacity and characteristics such as well can weld, and also has characteristics with low cost concurrently.
Embodiment
Its chemical composition of the present invention is, per distribution ratio: C:0.15%～0.25% by weight, Si:0.15%～0.35%, Mn:0.75%～1.60%, P :≤0.020%, S :≤0.020%, Ni:0.08%～0.30%, Cu:0.20%～0.60%, Cr:0.30%～1.00%, Mo:0.10%～0.30%, Als:0.015%～0.045%, B:0.001%～0.003%, surplus are Fe and unavoidable impurities.
The present invention on the mentioned component basis, can add trace element such as Nb, Ti, V one or two or more kinds, total amount is no more than 0.22%.
The production technique of this steel plate is:
Steel ingot after will smelting by said ratio carries out soaking under 1220～1250 ℃, rolling then, and finishing temperature is rolled the back air cooling greater than 850 ℃; Heating temperature is 860～910 ℃ during modifier treatment, and 420～540 ℃ of tempering are carried out in shrend behind insulation 5～60min again, and furnace cooling obtains tempered martensite to room temperature.
The steel technical scheme set of dispense ratio according to the present invention is smelted with rolling.Chemical ingredients sees Table 1,2, and production technique sees Table 3, and mechanical property sees Table 4.
Table 1 analogous products and composition of steel of the present invention contrast
| C | Si | Mn | P | S | Cu | Cr | Ni | Als | Bs | Mo | |
| CN200610 046693.3 | 0.30～ 0.60 | 0.10～ 0.40 | 0.80～ 2.00 | ＜ 0.010 | ＜ 0.010 | 0.8～ 2.0 | 0.1～ 0.4 | ||||
| CN200610 018011.8 | ＜ 0.15 | 0.15～ 0.50 | 0.80～ 1.80 | ＜ 0.020 | ＜ 0.010 | 0.20～ 0.60 | ＜ 0.80 | ＜ 1.20 | ＜ 0.003 | ＜ 0.60 | |
| The invention steel | 0.15～ 0.25 | 0.15～ 0.35 | 0.75～ 1.60 | ＜ 0.020 | ＜ 0.020 | 0.20～ 0.60 | 0.30～ 1.00 | 0.08～ 0.30 | 0.015～ 0.045 | ＜ 0.003 | 0.10～ 0.30 |
Table 2 Comparative Examples and steel actual constituent of the present invention
| Sample number | C | Si | Mn | P | S | Cu | Cr | Ni | Nb | Bs | Ti | V | Mo |
| Compared steel 1 | 0.35 | 0.40 | 1.85 | 0.010 | 0.006 | 1.50 | 0.40 | ||||||
| Compared steel 2 | 0.10 | 0.20 | 0.94 | 0.015 | 0.004 | 0.47 | 0.86 | 0.055 | 0.002 | 0.022 | 0.020 | 0.38 | |
| Compared steel 3 | 0.12 | 0.30 | 0.95 | 0.008 | 0.003 | 0.61 | 1.14 | 0.057 | 0.002 | 0.020 | 0.030 | 0.37 | |
| Embodiment 1 | 0.18 | 0.26 | 1.07 | 0.0092 | 0.0093 | 0.36 | 0.41 | 0.17 | 0.029 | 0.0019 | 0.016 | - | 0.17 |
| Embodiment 2 | 0.15 | 0.35 | 1.53 | 0.0086 | 0.0091 | 0.27 | 0.69 | 0.19 | 0.029 | 0.0016 | 0.017 | 0.027 | 0.11 |
| Embodiment 3 | 0.19 | 0.23 | 1.39 | 0.0087 | 0.0088 | 0.58 | 0.51 | 0.30 | 0.027 | 0.0010 | - | - | 0.25 |
| Embodiment 4 | 0.22 | 0.25 | 1.48 | 0.011 | 0.0083 | 0.25 | 0.59 | 0.18 | - | 0.0015 | 0.005 | 0.025 | 0.28 |
| Embodiment 5 | 0.25 | 0.15 | 1.49 | 0.010 | 0.0082 | 0.21 | 0.96 | 0.10 | 0.028 | 0.0029 | - | 0.019 | 0.16 |
Table 3 steel production technique of the present invention
Table 4 compared steel and steel actual performance of the present invention
Claims (2)
1. 900MPa level yield strength quenched and tempered steel plate, it is characterized in that, chemical ingredients is, weight percent: C:0.15%～0.19%, Si:0.15%～0.35%, Mn:0.75%～1.60%, P :≤0.020%, S :≤0.020%, Ni:0.08%～0.30%, Cu:0.20%～0.60%, Cr:0.30%～1.00%, Mo:0.10 ~ 0.17%, Als:0.015%～0.045%, B:0.001%～0.003%, one or two or more kinds in Nb, Ti, the V trace element, total amount is no more than 0.22%, and surplus is Fe and unavoidable impurities.
2. the manufacture method of a kind of 900MPa level yield strength quenched and tempered steel plate as claimed in claim 1 is characterized in that,
Steel ingot after will smelting by said ratio carries out soaking under 1220 ~ 1250 ℃, rolling then, and finishing temperature is rolled the back air cooling greater than 850 ℃; Heating temperature is 860 ~ 910 ℃ during modifier treatment, and 420 ~ 540 ℃ of tempering are carried out in shrend behind insulation 5 ~ 60min again, and furnace cooling obtains martensitic stucture to room temperature.
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| CN104328350A (en) * | 2014-11-25 | 2015-02-04 | 湖南华菱涟源钢铁有限公司 | Hardened and tempered steel with yield strength of 960MPa level and manufacturing method of hardened and tempered steel |
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| JP3545980B2 (en) * | 1999-12-06 | 2004-07-21 | 株式会社神戸製鋼所 | Ultra high strength electric resistance welded steel pipe with excellent delayed fracture resistance and manufacturing method thereof |
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| CN101245437A (en) * | 2007-02-15 | 2008-08-20 | 宝山钢铁股份有限公司 | High collapse-resistance and hydrogen sulphide-corrosion-resistant low alloy petroleum case pipe and method of manufacturing the same |
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| CN104328350A (en) * | 2014-11-25 | 2015-02-04 | 湖南华菱涟源钢铁有限公司 | Hardened and tempered steel with yield strength of 960MPa level and manufacturing method of hardened and tempered steel |
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