CN104831185A - Low-cost high-strength steel plate for engineering machinery, and production method thereof - Google Patents
Low-cost high-strength steel plate for engineering machinery, and production method thereof Download PDFInfo
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Abstract
The invention discloses a low-cost high-strength steel plate for engineering machinery, and a production method thereof. The steel plate comprises, by mass, 0.16-0.18% of C, 0.3-0.4% of Si, 1.0-1.4% of Mn, 0.016% or less of P, 0.009% or less of S, 0.4-0.7% of Ni, 0.3-0.5% of Cr, 0.01-0.03% of Nb, 0.02-0.06% of Al, 0.30-0.40% of Mo, 0.010-0.030% of Ti, 0.0016-0.0030% of B, and the balance of Fe and inevitable impurities. The components of the steel plate produced through the method are reasonably designed, and a proper amount of boron element is added to reduce the use amount of alloy elements, so the production cost is low; a two-stage controlled rolling technology is adopted to solve coarse and uneven crystal grains due to common hot rolling, so the produced steel plate has excellent comprehensive mechanical performances and uniform rolled structure, and provides a uniform original structure for subsequent heat treatment; an offline quenching heat treatment technology is adopted to make the steel plate have a martensite structure, so the strength grade of the steel plate is improved, and the plate shape of the steel plate is good; and a tempering heat treatment technology is adopted to eliminate the internal stress of the steel plate, so the low temperature toughness of the steel plate is improved, and the structure of the steel plate is uniform.
Description
Technical field
The invention belongs to ferrous materials smelting processing and technical field of heat treatment, especially a kind of low-cost high-strength steel for engineering machinery plate and production method thereof.
Background technology
Along with the fast development of China's construction machinery industry, constantly increase the demand of high-strength engineering machinery steel plate, high-strength engineering machinery steel is mainly used in the big machinery such as dozer, excavator.Domestic each steel mill generally adopts rolls rear Tempering and Quenching and namely quenches and increase temperature the explained hereafter of tempering, because a large amount of alloying elements is often added in the production of the steel for engineering machinery of this rank, cause the high of production cost, have a strong impact on the productive profit of enterprise, therefore how to optimize chemical composition and thermal treatment process, realizing when not adding too much precious metal as kept the intensity of superelevation and good low-temperature flexibility when nickel is be worth the common problem paid close attention to.
Summary of the invention
The technical problem to be solved in the present invention is to provide the good low-cost high-strength steel for engineering machinery plate of a kind of comprehensive mechanical property; Present invention also offers a kind of production method of low-cost high-strength steel for engineering machinery plate.
For solving the problems of the technologies described above, the mass percentage of chemical composition of the present invention is: C 0.16 ~ 0.18%, Si 0.3 ~ 0.4%, Mn 1.0 ~ 1.4%, P≤0.016%, S≤0.009%, Ni 0.4 ~ 0.7%, Cr 0.3 ~ 0.5%, Nb 0.01 ~ 0.03%, Al 0.02 ~ 0.06%, Mo 0.30 ~ 0.40%, Ti 0.010 ~ 0.030%, B 0.0016 ~ 0.0030%, and surplus is Fe and inevitable impurity.
The thickness of steel plate of the present invention is 80mm.
In the present invention, the effect of each chemical composition is:
C: the intensity that can be significantly improved steel plate by gap solid solution.
Si: general content in steel is not less than 0.4%, improves the hardening capacity of steel, is present in steel with solid solution form, improves the intensity of steel.
Mn: solid solution is present in steel, expands austenitic area, improves the hardening capacity of steel, the intensity of steel is significantly promoted.
Ni: expand austenitic area, is formed and the main alloy element of stable austenite, improves the hardening capacity of steel, steel low temperature brittleness transition temperature is reduced, raising steel intensity.
Cr: can alleviate austenitic decomposition rate, improves the hardening capacity of steel, the intensity of steel is got a promotion.
Mo: have solution strengthening effect in steel, plays advantageous effect to the toughness and wear resistance improving steel.
Ti: it adds can fix N element in steel, reduces the generation of BN in steel, and increase the content of effectively boron in steel, Ti is also strong carbide generting element, plays the effect of precipitation strength.
Nb: it adds can crystal grain thinning, improves the strength and toughness of steel, and improves the intensity of steel by precipitation strength further.
Al: the reductor in steel, can crystal grain thinning, improves the toughness of steel, and improves the intensity of steel by solution strengthening.
B: the remarkable effect in steel is that its atomic few effective content just can make the hardening capacity of steel be multiplied, adds boron and is conducive to the high strength of steel to combine with good weldability and anti-cold short ability in steel; Also can improve grain-boundary strength and then improve resistant to hydrogen and cause the ability of transgranular fracture, the microtexture of low-carbon bainite steel and mechanical property also be had a significant effect simultaneously.
The inventive method comprises smelting, casting, heating, rolling and heat treatment step; The mass percentage of described steel plate chemical composition is described above;
Described rolling process: adopt two benches controlled rolling process; First stage rolling temperature is 980 ~ 1150 DEG C, and single pass draft is 10 ~ 16%, and accumulation draft is 40 ~ 60%; Subordinate phase rolling temperature is 800 ~ 950 DEG C, and single pass draft is 11 ~ 16%, and accumulative draft is 40 ~ 70%, and rolling must roll state steel plate;
Described heat treatment step: carry out quench treatment to rolling state steel plate, quenching temperature is 910 ± 10 DEG C, heat insulating coefficient is that 1 ~ 3min/mm(and soaking time calculate by every millimeter of steel plate thickness heating for 1 ~ 3 minute), by the steel plate water-cooled after insulation to room temperature; Steel plate after quenching is carried out temper, and tempering temperature is 500 ± 10 DEG C, and heat insulating coefficient is that 1.5 ~ 3min/mm(and soaking time calculate by every millimeter of steel plate thickness heating for 1.5 ~ 3 minutes), the steel plate after insulation is carried out air-cooled, obtains finished steel plate.
Rolling process described in the inventive method: the start rolling temperature temperature of first stage rolling is 1000 ~ 1150 DEG C, and finishing temperature is 980 ~ 1050 DEG C; The start rolling temperature of subordinate phase is 900 ~ 950 DEG C, and finishing temperature is 800 ~ 860 DEG C.
Heating process described in the inventive method: steel billet is heated to 1200 DEG C ± 10 DEG C insulations with the heat-up rate of 400 ~ 500 DEG C/h, soaking time (6 ± 2) min/cm(and soaking time calculate by every centimetre of steel plate thickness heating for 6 ± 2 minutes).
Smelting procedure described in the inventive method: adopt vacuum induction furnace to smelt, molten steel adds ferro-boron before coming out of the stove.
To cast described in the inventive method operation: the steel billet molten steel casting after smelting being become 300 ~ 330mm; Pouring temperature is 1560 ~ 1600 DEG C.
The beneficial effect adopting technique scheme to produce is: chemical composition design of the present invention is reasonable, by adding appropriate boron, the hardening capacity of steel is multiplied, whole martensitic stuctures can be obtained under low cooling rate, the expensive alloying element such as a large amount of nickel, chromium, molybdenum can be saved, reduce the production cost of steel plate.
The steel plate Composition Design of the inventive method is reasonable, and by adding appropriate boron, reduce the usage quantity of alloying element, production cost is low; Steel plate adopts two benches controlled rolling and quenching-and-tempering process, and obtained finished steel plate yield strength is high, low-temperature impact toughness and plasticity good.The inventive method adopts two benches controlled rolling process, and solve common hot rolling and cause coarse grains inequality, the steel plate of production has excellent comprehensive mechanical property, rolls state homogeneous microstructure, for follow-up thermal treatment provides uniform original structure; Adopt the thermal treatment process of out-line quenching, make steel plate obtain martensitic stucture, promote armor plate strength grade, steel plate template is good; By tempering heat treatment process, eliminate steel plate internal stress, improve the low-temperature flexibility of steel plate, uniform steel sheet tissue.
The inventive method adopts vacuum induction furnace to smelt, and reduces the oxygen and nitrogen content in steel, reduces the generation of boron oxide and boron nitride in steel, adds the content of effective boron in steel, the hardening capacity of steel is promoted at double.The inventive method mold becomes the blank (steel billet) of 300mm, guarantees the compression ratio that rolling is enough, crystal grain thinning.The steel plate thickness that the present invention obtains is the good mechanical properties of 80mm, finished steel plate, homogeneous microstructure.
The steel of the inventive method gained steel plate is pure, and yield strength is high, and well ,-40 DEG C of ballistic works reach more than 35 Jiao, and unit elongation reaches more than 14% for low-temperature impact toughness and plasticity.
Embodiment
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
Embodiment 1: composition proportion and the production technique of this low-cost high-strength steel for engineering machinery plate are as described below.
The mass percent of this steel plate chemical composition is: C 0.17%, Si 0.3%, Mn 1.3%, P 0.007%, S 0.004%, Ni 0.6%, Cr 0.5%, Nb 0.03%, Al 0.02%, Mo 0.40%, Ti 0.028%, B 0.003%, and surplus is Fe and inevitable impurity; The thickness of steel plate is 80mm.
The processing step of this Plate Production method is as described below:
(1) smelting procedure: first smelted through vacuum induction furnace by molten steel, the addition sequence of Al-Ti-B alloy element is first add aluminium deoxidation, and then add titanium fixed nitrogen element, molten steel adds boron before coming out of the stove, and guarantees that molten steel contains the Boron contents of 0.003%.
(2) casting operation, becomes square billet (steel billet), pouring temperature 1600 DEG C by the molten steel casting after smelting, obtains the thick square billet of 300mm.
(3) heating process: by steel billet with DEG C insulation of the heating rate to 1200 of 400 DEG C/h, soaking time 2h.
(4) rolling process: adopt two benches controlled rolling process; First stage rolling temperature is 1000 ~ 1150 DEG C, and start rolling temperature is 1150 DEG C, and finishing temperature is 1000 DEG C, and this stage single pass draft is 10 ~ 16%, and accumulation draft is 43%, this stage rolling generation recrystallize, thus refinement austenite crystal; Subordinate phase rolling temperature is 830 ~ 950 DEG C, start rolling temperature 950 DEG C, and finishing temperature is 830 DEG C, and single pass draft is 11 ~ 14%, and accumulative draft is 53%, and rolling obtains rolling state steel plate.
(5) heat treatment step: carry out quench treatment to rolling state steel plate, quenching temperature is 910 DEG C, heat insulating coefficient is that namely 1min/mm(is incubated 1 minute calculating soaking time by every millimeter of steel plate thickness), the steel plate after insulation is passed through water cooling plant water-cooled to room temperature; Steel plate after quenching is carried out temper, and tempering temperature is 500 DEG C, and heat insulating coefficient is that namely 1.5min/mm(is incubated 1.5 minutes calculating soaking times by every millimeter of steel plate thickness), the steel plate after insulation is placed on ventilation opening and carries out air-cooled, obtain finished steel plate.
The mechanical property of this steel plate: yield strength 982MPa, tensile strength 1074MPa ,-40 DEG C of ballistic works average 35 are burnt, and unit elongation is 14.3%; The low-temperature impact-resistant toughness of this steel plate and plasticity good.
Embodiment 2: composition proportion and the production technique of this low-cost high-strength steel for engineering machinery plate are as described below.
The mass percent of this steel plate chemical composition is: C 0.16%, Si 0.35%, Mn 1.4%, P 0.009%, S 0.005%, Ni 0.4%, Cr 0.4%, Nb 0.02%, Al 0.06%, Mo 0.37%, Ti 0.016%, B 0.0022%, and surplus is Fe and inevitable impurity; The thickness of steel plate is 80mm.
The processing step of this Plate Production method is as described below:
(1) smelting procedure: first smelted through vacuum induction furnace by molten steel, the addition sequence of Al-Ti-B alloy element is first add aluminium deoxidation, and then add titanium fixed nitrogen element, molten steel adds boron before coming out of the stove, and guarantees that molten steel contains the Boron contents of 0.0022%.
(2) casting operation, becomes square billet (steel billet), pouring temperature 1560 DEG C by the molten steel casting after smelting, obtains the thick square billet of 300mm.
(3) heating process: by steel billet with DEG C insulation of the heating rate to 1210 of 450 DEG C/h, soaking time 3h.
(4) rolling process: adopt two benches controlled rolling process; First stage rolling temperature is 990 ~ 1130 DEG C, and start rolling temperature is 1130 DEG C, and finishing temperature is 990 DEG C, and this stage single pass draft is 10 ~ 12%, and accumulation draft is 50%, this stage rolling generation recrystallize, thus refinement austenite crystal; Subordinate phase rolling temperature is 800 ~ 900 DEG C, start rolling temperature 900 DEG C, and finishing temperature is 800 DEG C, and single pass draft is 13 ~ 16%, and accumulative draft is 40%, and rolling obtains rolling state steel plate.
(5) heat treatment step: carry out quench treatment to rolling state steel plate, quenching temperature is 900 DEG C, and heat insulating coefficient is 2min/mm, passes through water cooling plant water-cooled to room temperature by the steel plate after insulation; Steel plate after quenching is carried out temper, and tempering temperature is 510 DEG C, and heat insulating coefficient is 2.5min/mm, the steel plate after insulation is placed on ventilation opening and carries out air-cooled, obtain finished steel plate.
The mechanical property of this steel plate: yield strength 984MPa, tensile strength 1080MPa ,-40 DEG C of ballistic works average 38 are burnt, and unit elongation is 14.8%; The low-temperature impact-resistant toughness of this steel plate and plasticity good.
Embodiment 3: composition proportion and the production technique of this low-cost high-strength steel for engineering machinery plate are as described below.
The mass percent of this steel plate chemical composition is: C 0.18%, Si 0.37%, Mn 1.0%, P 0.012%, S 0.009%, Ni 0.5%, Cr 0.3%, Nb 0.02%, Al 0.04%, Mo 0.34%, Ti 0.010%, B 0.0016%, and surplus is Fe and inevitable impurity; The thickness of steel plate is 80mm.
The processing step of this Plate Production method is as described below:
(1) smelting procedure: first smelted through vacuum induction furnace by molten steel, the addition sequence of Al-Ti-B alloy element is first add aluminium deoxidation, and then add titanium fixed nitrogen element, molten steel adds boron before coming out of the stove, and guarantees that molten steel contains the Boron contents of 0.0016%.
(2) casting operation, becomes square billet (steel billet), pouring temperature 1580 DEG C by the molten steel casting after smelting, obtains the thick square billet of 300mm.
(3) heating process: by steel billet with DEG C insulation of the heating rate to 1190 of 500 DEG C/h, soaking time 2.5h.
(4) rolling process: adopt two benches controlled rolling process; First stage rolling temperature is 980 ~ 1000 DEG C, and start rolling temperature is 1000 DEG C, and finishing temperature is 980 DEG C, and this stage single pass draft is 12 ~ 14%, and accumulation draft is 40%, this stage rolling generation recrystallize, thus refinement austenite crystal; Subordinate phase rolling temperature is 860 ~ 920 DEG C, start rolling temperature 920 DEG C, and finishing temperature is 860 DEG C, and single pass draft is 11 ~ 13%, and accumulative draft is 70%, and rolling obtains rolling state steel plate.
(5) heat treatment step: carry out quench treatment to rolling state steel plate, quenching temperature is 920 DEG C, and heat insulating coefficient is 1.5min/mm, passes through water cooling plant water-cooled to room temperature by the steel plate after insulation; Steel plate after quenching is carried out temper, and tempering temperature is 505 DEG C, and heat insulating coefficient is 2min/mm, the steel plate after insulation is placed on ventilation opening and carries out air-cooled, obtain finished steel plate.
The mechanical property of this steel plate: yield strength 991MPa, tensile strength 1088MPa ,-40 DEG C of ballistic works average 40 are burnt, and unit elongation is 14.1%; The low-temperature impact-resistant toughness of this steel plate and plasticity good.
Embodiment 4: composition proportion and the production technique of this low-cost high-strength steel for engineering machinery plate are as described below.
The mass percent of this steel plate chemical composition is: C 0.17%, Si 0.4%, Mn 1.2%, P 0.016%, S 0.006%, Ni 0.7%, Cr 0.4%, Nb 0.01%, Al 0.03%, Mo 0.30%, Ti 0.030%, B 0.0025%, and surplus is Fe and inevitable impurity; The thickness of steel plate is 80mm.
The processing step of this Plate Production method is as described below:
(1) smelting procedure: first smelted through vacuum induction furnace by molten steel, the addition sequence of Al-Ti-B alloy element is first add aluminium deoxidation, and then add titanium fixed nitrogen element, molten steel adds boron before coming out of the stove, and guarantees that molten steel contains the Boron contents of 0.0025%.
(2) casting operation, becomes square billet (steel billet), pouring temperature 1570 DEG C by the molten steel casting after smelting, obtains the thick square billet of 300mm.
(3) heating process: by steel billet with DEG C insulation of the heating rate to 1200 of 420 DEG C/h, soaking time 4h.
(4) rolling process: adopt two benches controlled rolling process; First stage rolling temperature is 1050 ~ 1120 DEG C, and start rolling temperature is 1120 DEG C, and finishing temperature is 1050 DEG C, and this stage single pass draft is 12 ~ 14%, and accumulation draft is 60%, this stage rolling generation recrystallize, thus refinement austenite crystal; Subordinate phase rolling temperature is 850 ~ 930 DEG C, start rolling temperature 930 DEG C, and finishing temperature is 850 DEG C, and single pass draft is 12 ~ 14%, and accumulative draft is 500%, and rolling obtains rolling state steel plate.
(5) heat treatment step: carry out quench treatment to rolling state steel plate, quenching temperature is 910 DEG C, and heat insulating coefficient is 3min/mm, passes through water cooling plant water-cooled to room temperature by the steel plate after insulation; Steel plate after quenching is carried out temper, and tempering temperature is 490 DEG C, and heat insulating coefficient is 3min/mm, the steel plate after insulation is placed on ventilation opening and carries out air-cooled, obtain finished steel plate.
The mechanical property of this steel plate: yield strength 984MPa, tensile strength 1070MPa ,-40 DEG C of ballistic works average 40 are burnt, and unit elongation is 14.6%; The low-temperature impact-resistant toughness of this steel plate and plasticity good.
Claims (8)
1. a low-cost high-strength steel for engineering machinery plate, it is characterized in that, the mass percentage of its chemical composition is: C 0.16 ~ 0.18%, Si 0.3 ~ 0.4%, Mn 1.0 ~ 1.4%, P≤0.016%, S≤0.009%, Ni 0.4 ~ 0.7%, Cr 0.3 ~ 0.5%, Nb 0.01 ~ 0.03%, Al 0.02 ~ 0.06%, Mo 0.30 ~ 0.40%, Ti 0.010 ~ 0.030%, B 0.0016 ~ 0.0030%, and surplus is Fe and inevitable impurity.
2. low-cost high-strength steel for engineering machinery plate according to claim 1, is characterized in that: the thickness of described steel plate is 80mm.
3. a production method for low-cost high-strength steel for engineering machinery plate, is characterized in that: described method comprises smelting, casting, heating, rolling and heat treatment step; The mass percentage of described steel plate chemical composition is: C 0.16 ~ 0.18%, Si 0.3 ~ 0.4%, Mn 1.0 ~ 1.4%, P≤0.016%, S≤0.009%, Ni 0.4 ~ 0.7%, Cr 0.3 ~ 0.5%, Nb 0.01 ~ 0.03%, Al 0.02 ~ 0.06%, Mo 0.30 ~ 0.40%, Ti 0.010 ~ 0.030%, B 0.0016 ~ 0.0030%, and surplus is Fe and inevitable impurity;
Described rolling process: adopt two benches controlled rolling process; First stage rolling temperature is 980 ~ 1150 DEG C, and single pass draft is 10 ~ 16%, and accumulation draft is 40 ~ 60%; Subordinate phase rolling temperature is 800 ~ 950 DEG C, and single pass draft is 11 ~ 16%, and accumulative draft is 40 ~ 70%, and rolling must roll state steel plate;
Described heat treatment step: carry out quench treatment to rolling state steel plate, quenching temperature is 910 ± 10 DEG C, and heat insulating coefficient is 1 ~ 3min/mm, by the steel plate water-cooled after insulation to room temperature; Steel plate after quenching is carried out temper, and tempering temperature is 500 ± 10 DEG C, and heat insulating coefficient is 1.5 ~ 3min/mm, is undertaken air-cooled, obtain finished steel plate by the steel plate after insulation.
4. the production method of low-cost high-strength steel for engineering machinery plate according to claim 3, is characterized in that, described rolling process: the start rolling temperature temperature of first stage rolling is 1000 ~ 1150 DEG C, and finishing temperature is 980 ~ 1050 DEG C; The start rolling temperature of subordinate phase is 900 ~ 950 DEG C, and finishing temperature is 800 ~ 860 DEG C.
5. the production method of low-cost high-strength steel for engineering machinery plate according to claim 3, it is characterized in that, described heating process: steel billet is heated to 1200 DEG C ± 10 DEG C insulations with the heat-up rate of 400 ~ 500 DEG C/h, soaking time (6 ± 2) min/cm.
6. the production method of low-cost high-strength steel for engineering machinery plate according to claim 3, is characterized in that, described smelting procedure: adopt vacuum induction furnace to smelt, molten steel adds ferro-boron before coming out of the stove.
7. the production method of the low-cost high-strength steel for engineering machinery plate according to claim 3-6 any one, is characterized in that, described casting operation: the steel billet molten steel casting after smelting being become 300 ~ 330mm.
8. the production method of low-cost high-strength steel for engineering machinery plate according to claim 7, is characterized in that: pouring temperature is 1560 ~ 1600 DEG C.
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| CN105779899A (en) * | 2016-03-09 | 2016-07-20 | 山东钢铁股份有限公司 | 800 MPa-level high-strength-tenacity steel plate used for engineering machine in extremely cold environment and manufacturing method for 800 MPa-level high-strength-tenacity steel plate |
| WO2019223209A1 (en) * | 2018-05-24 | 2019-11-28 | 南京钢铁股份有限公司 | 500 mpa-grade engineering machinery steel and manufacturing method therefor |
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| WO2020253335A1 (en) * | 2019-06-20 | 2020-12-24 | 江阴兴澄特种钢铁有限公司 | Large-thickness lamellar tearing-resistant high-strength steel plate with 960 mpa-level yield strength, and production method therefor |
| CN112359170A (en) * | 2020-10-21 | 2021-02-12 | 河钢股份有限公司 | Method for refining annealed grain size of low-carbon alloy steel |
| WO2021208178A1 (en) * | 2020-04-17 | 2021-10-21 | 南京钢铁股份有限公司 | 690 mpa-graded easy-to-weld corrosion-resisting high-strength steel and manufacturing method therefor |
| CN113957361A (en) * | 2021-06-29 | 2022-01-21 | 鞍钢股份有限公司 | Austenitic heat-resistant steel plate for petrochemical equipment and manufacturing method thereof |
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Application publication date: 20150812 |