CN114150225A - Non-quenched and tempered steel and preparation method and application thereof - Google Patents
Non-quenched and tempered steel and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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Abstract
The invention relates to non-quenched and tempered steel and a preparation method and application thereof, wherein the non-quenched and tempered steel comprises the following components in percentage by mass: 0.36 to 0.4 percent of C, 0.5 to 0.65 percent of Si, 1.3 to 1.45 percent of Mn, less than or equal to 0.015 percent of P, 0.02 to 0.045 percent of S, 0.15 to 0.3 percent of Cr0, 0.08 to 0.15 percent of V, less than or equal to Ni0.15 percent of Nb0.012-0.02 percent of N, 0.012-0.02 percent of N, 0.01-0.025 percent of Ti, and the balance of iron and inevitable impurities. The composite microalloy is strengthened by V, Nb, Ti and N elements, and the composition is strictly controlled, so that (Nb)x,Vy)(C1‑xN1‑y) The alloy phase strengthens the performance of non-quenched and tempered steel, simultaneously adds Ni element, and adopts a deformation control system to achieve the purposes of controlling deformation, refining the structure and improving the comprehensive performance of steel.
Description
Technical Field
The invention relates to the field of steelmaking, in particular to non-quenched and tempered steel and a preparation method and application thereof.
Background
Currently, non-heat treated steels have found wide application, particularly in the automotive industry. Such as crankshaft, connecting rod, front axle, steering knuckle, steering arm, semi-axle, drive axle and shaft fork.
For example, CN111748751A discloses a non-quenched and tempered steel, wherein the tensile strength Rm is 900-1150MPa, the yield strength Rel is more than or equal to 600MPa, the elongation A is more than or equal to 10%, the reduction of area Z is more than or equal to 20%, and the impact energy AKu is more than or equal to 30J; the chemical elements of the non-quenched and tempered steel contain: C. the manufacturing method of the quenched and tempered steel comprises the steps of steel making, blanking, machining, surface induction quenching, tempering, excircle grinding and flaw detection. The non-quenched and tempered steel manufactured by the method has excellent mechanical properties, the traditional quenching and tempering heat treatment process is omitted, the machining allowance is reduced, the production efficiency is improved, and the cutting processability and the wear resistance of the knuckle pin manufactured by the non-quenched and tempered steel are improved.
CN104911486A discloses a non-quenched and tempered steel for automobile fastener screws and a production method thereof, and the production method comprises the production steps of heating, rolling and cooling of non-quenched and tempered steel chemical components and steel billets thereof, wherein the non-quenched and tempered steel comprises the following chemical components in percentage by mass: 0.35-0.45%, Si: 0.45-0.65%, Mn: 1.30-1.50%, P: 0.010-0.030%, S: 0.015-0.035%, Al: 0.005-0.015%, Cr: 0.10-0.30%, V: 0.05-0.15%, N: 0.0080-0.0150%, and the balance of Fe and inevitable impurities; controlling the heating temperature of the steel billet to 1150-1250 ℃, keeping the initial rolling temperature to 1020-1100 ℃, keeping the final rolling temperature to 800-900 ℃, and keeping the reduction amount to be more than or equal to 15; the cooling speed after rolling is controlled to be 1-10 ℃/s, the production process line is simple, the operability is strong, the control is easy, the tensile strength of the produced non-quenched and tempered steel is greater than 900MPa, the yield strength is greater than 650MPa, the elongation is greater than 20%, the reduction of area is greater than 45%, and finally the high-strength and high-toughness medium-carbon non-quenched and tempered steel suitable for automobile fastener screws is obtained.
However, the existing non-quenched and tempered steel for vehicles still has the problems of poor performance or unstable mechanical property in the use process.
Disclosure of Invention
In view of the problems of the prior art, one of the objects of the present invention is to provide a method for manufacturing a semiconductor device.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a non-quenched and tempered steel, comprising, in mass percent: 0.36 to 0.4 percent of C, 0.5 to 0.65 percent of Si, 1.3 to 1.45 percent of Mn, less than or equal to 0.015 percent of P, 0.02 to 0.045 percent of S, 0.15 to 0.3 percent of Cr, 0.08 to 0.15 percent of V, less than or equal to 0.15 percent of Ni, 0.012 to 0.02 percent of Nb, 0.012 to 0.02 percent of N, 0.01 to 0.025 percent of Tis, and the balance of Fe and inevitable impurities.
The non-quenched and tempered steel provided by the invention is subjected to composite microalloy strengthening through V, Nb, Ti and N elements, and the specific composition of the non-quenched and tempered steel is strictly controlled to form (Nb)x,Vy)(C1-xN1-y) The alloy phase strengthens the performance of non-quenched and tempered steel, simultaneously adds Ni element, and adopts a deformation control system to achieve the purposes of controlling deformation, refining the structure and improving the comprehensive performance of steel.
In the present invention, the C content in the non-heat-treated steel is 0.36 to 0.4% by mass, and may be, for example, 0.36%, 0.365%, 0.37%, 0.375%, 0.38%, 0.385%, 0.39%, 0.395%, or 0.4%, but is not limited to the above-mentioned values, and other combinations not shown in the above range are also applicable.
In the present invention, the Si content in the non-heat-treated steel is 0.5 to 0.65% by mass, and may be, for example, 0.5%, 0.51%, 0.52%, 0.53%, 0.54%, 0.56%, 0.57%, 0.58%, 0.59%, 0.6%, 0.61%, 0.62%, 0.63%, 0.64%, or 0.65%, but not limited to the above-mentioned values, and other combinations not listed in this range are also applicable.
In the present invention, the Mn content in the non-heat-treated steel is 1.3 to 1.45% by mass, and may be, for example, 1.3%, 1.31%, 1.32%, 1.34%, 1.35%, 1.36%, 1.37%, 1.38%, 1.39%, 1.4%, 1.41%, 1.42%, 1.43%, 1.44%, or 1.45%, but is not limited to the above-mentioned values, and other combinations not shown in this range are also applicable.
In the present invention, the content of P in the non-heat-treated steel is 0.015% by mass or less, and may be, for example, 0.015%, 0.014%, 0.013%, 0.012%, 0.011%, 0.01%, 0.009%, 0.008%, 0.007%, 0.006%, or 0.005%, but not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
In the present invention, the non-heat-treated steel may contain 0.02 to 0.045% by mass of S, for example, 0.02%, 0.021%, 0.022%, 0.023%, 0.024%, 0.025%, 0.026%, 0.027%, 0.028%, 0.029%, 0.03%, 0.031%, 0.032%, 0.033%, 0.034%, 0.035%, 0.036%, 0.037%, 0.038%, 0.039%, 0.04%, 0.041%, 0.042%, 0.043%, 0.044%, or 0.045%, but not limited to these, and other values not specified in this range are also applicable.
In the present invention, the content of Cr in the non-heat-treated steel is 0.15 to 0.3% by mass, and may be, for example, 0.15%, 0.16%, 0.17%, 0.18%, 0.19%, 0.2%, 0.21%, 0.22%, 0.23%, 0.24%, 0.25%, 0.26%, 0.27%, 0.28%, 0.29%, or 0.3%, but not limited to the above-mentioned values, and other combinations not shown in this range are also applicable.
In the present invention, V in the non-heat-treated steel may be 0.08 to 0.15% by mass, for example, 0.08%, 0.09%, 0.1%, 0.11%, 0.12%, 0.13%, 0.14%, or 0.15%, but is not limited to the above-mentioned values, and other combinations not shown in the above-mentioned range are also applicable.
In the present invention, the Ni content in the non-heat-treated steel is not more than 0.15% by mass, and may be, for example, 0.15%, 0.14%, 0.13%, 0.12%, 0.11%, 0.1%, 0.09%, 0.08%, 0.07%, 0.06%, or 0.05%, but is not limited to the above-mentioned values, and other combinations not shown in the above range are also applicable.
In the present invention, the non-heat-treated steel may contain 0.012 to 0.02% by mass of N, for example, 0.012%, 0.013%, 0.014%, 0.015%, 0.016%, 0.017%, 0.018%, 0.019%, or 0.02%, but is not limited to the above-mentioned numerical values, and other combinations not shown in this range are also applicable.
In the present invention, the Ti content in the non-heat-treated steel is 0.01 to 0.025% by mass, and may be, for example, 0.01%, 0.011%, 0.012%, 0.013%, 0.014%, 0.015%, 0.016%, 0.017%, 0.018%, 0.019%, 0.02%, 0.021%, 0.022%, 0.023%, 0.024%, or 0.025% by mass, but is not limited to the above-mentioned numerical values, and other combinations not listed in this range are also applicable.
In the present invention, the Nb content in the non-heat-treated steel is 0.012 to 0.02% by mass, and may be, for example, 0.012%, 0.013%, 0.014%, 0.015%, 0.016%, 0.017%, 0.018%, 0.019%, or 0.02% by mass, but is not limited to the above-mentioned numerical values, and other combinations not shown in this range are also applicable.
As a preferable technical scheme of the invention, the non-quenched and tempered steel comprises the following components in percentage by mass: 0.38-0.39% of C, 0.58-0.62% of Si, 1.35-1.4% of Mn, less than or equal to 0.015% of P, 0.02-0.045% of S, 0.2-0.22% of Cr0.1-0.12% of V, less than or equal to 0.15% of Ni, 0.015-0.018% of Nb, 0.015-0.017% of N, 0.014-0.02% of Ti, and the balance of Fe and inevitable impurities.
In a second aspect, the present invention provides a method for producing a non-quenched and tempered steel as set forth in the first aspect, the method comprising:
sequentially carrying out converter smelting, LF refining, VD vacuum, continuous casting, heating and rolling, and then cooling to obtain the non-quenched and tempered steel;
adding nickel element and vanadium element according to a formula in the converter smelting process;
and adding niobium and titanium in the VD vacuum according to a formula.
As a preferable technical solution of the present invention, the heat treatment includes preheating, heating, and soaking in sequence.
Preferably, the temperature of the preheating is 900 ℃ or less, for example, 900 ℃, 890 ℃, 880 ℃, 870 ℃, 860 ℃, 850 ℃, 840 ℃, 830 ℃, 820 ℃, 810 ℃, 800 ℃, 780 ℃, 760 ℃, 740 ℃, 720 ℃ or 700 ℃, but not limited to the recited values, and other combinations not recited within this range are also applicable.
Preferably, the heating temperature is 1190 ℃ and 1200 ℃, for example, 1190 ℃, 1191 ℃, 1192 ℃, 1193 ℃, 1194 ℃, 1195 ℃, 1196 ℃, 1197 ℃, 1198 ℃, 1199 ℃ or 1200 ℃ and the like, but not limited to the values listed, and other combinations not listed within this range are also applicable.
Preferably, the heating time is 150-.
Preferably, the soaking temperature is 1170-1200 deg.C, such as 1170 deg.C, 1180 deg.C, 1190 deg.C, 1191 deg.C, 1192 deg.C, 1193 deg.C, 1194 deg.C, 1195 deg.C, 1196 deg.C, 1197 deg.C, 1198 deg.C, 1199 deg.C or 1200 deg.C, but not limited to the values listed, and other combinations not listed within this range are also applicable.
Preferably, the soaking time is 100-120min, such as 100min, 101min, 102min, 103min, 104min, 105min, 106min, 107min, 108min, 109min, 110min, 111min, 112min, 113min, 114min, 115min, 116min, 117min, 118min, 119min, or 120min, but not limited to the values listed, and other combinations not listed in this range are also applicable.
In a preferred embodiment of the present invention, the temperature of the initial rolling during the rolling is 1070-.
Preferably, the temperature at the inlet of the water tank during rolling is 980-.
As a preferred embodiment of the present invention, the temperature after passing water through the steel during rolling is 820-850 ℃, for example 820 ℃, 822 ℃, 824 ℃, 826 ℃, 828 ℃, 830 ℃, 832 ℃, 834 ℃, 836 ℃, 838 ℃, 840 ℃, 842 ℃, 844 ℃, 846 ℃, 848 ℃, or 850 ℃, but not limited to the above-mentioned values, and other combinations not listed in this range are also applicable.
As a preferable embodiment of the present invention, the inlet temperature of the rolling mill during the rolling is 835-846 ℃, for example 835 ℃, 836 ℃, 837 ℃, 838 ℃, 839 ℃, 840 ℃, 841 ℃, 842 ℃, 843 ℃, 844 ℃, 845 ℃ or 846 ℃, etc., but not limited to the values listed, and other combinations not listed in this range are also applicable.
In a preferred embodiment of the present invention, the temperature of the upper cooling bed in the rolling process is 780-790 ℃, for example 780, 781, 782, 783, 784, 785, 786, 787, 788, 789 or 790, but is not limited to the above values, and other combinations not listed in this range are also applicable.
As a preferred technical solution of the present invention, the preparation method comprises:
sequentially carrying out converter smelting, LF refining, VD vacuum, continuous casting, heating and rolling, and then cooling to obtain the non-quenched and tempered steel;
adding nickel element and vanadium element according to a formula in the converter smelting process;
adding niobium and titanium in the VD vacuum according to a formula;
the heat treatment comprises preheating, heating and soaking in sequence; the preheating temperature is less than or equal to 900 ℃; the heating temperature is 1190-; the soaking temperature is 1170-1200 ℃ and the time is 100-120 min;
the initial rolling temperature in the rolling process is 1070 and 1130 ℃; the temperature of the inlet of the water tank in the rolling process is 980-990 ℃; the temperature of the rolled steel after water penetration in the rolling process is 820-850 ℃; the inlet temperature of the rolling mill during the rolling is 835-846 ℃; the temperature of the upper cooling bed in the rolling is 780-790 ℃.
The preparation method provided by the invention realizes the further refinement of steel crystal grains by adopting the combination of the rolling and cooling control process and the regulation and control of components, and further strengthens the performance of the obtained non-quenched and tempered steel.
In the invention, the converter smelting process is as follows: the molten iron is pretreated by KR, the content of S in the molten iron is less than or equal to 0.050 percent, the terminal component P of the converter is less than or equal to 0.010 percent, and the content of S in the converter is less than or equal to 0.035 percent, alloy materials such as manganese-silicon alloy, high-carbon ferrochrome, ferrovanadium, ferrosilicon, nickel plates, aluminum ingots and the like and auxiliary materials such as lime, refining slag and the like are added according to the formula in the steel discharging process, and the steel discharging temperature is more than or equal to 1620 ℃.
In the invention, LF refining smelting: the first electrode is electrified for more than or equal to 15min, and 0-100kg of lime, 15-30kg of aluminum powder, 15-20kg of silicon carbide and 15-30kg of carbon powder are added. The second electrode is electrified for more than or equal to 10min, and 0-10kg of aluminum powder, 5-15kg of silicon carbide and 5-20kg of carbon powder are added. And adding 20-50kg of silicon carbide for the rest of the electrode electrifying time. The total smelting time is more than or equal to 48min, and the white slag retention time is more than or equal to 15 min. The components are finely adjusted according to the content of the molten steel alloy in the smelting process until the components are required to be separated (such as 0.35-0.27 percent of C, 0.53-0.57 percent of Si, 1.25-1.29 percent of Mn, 0.21-0.25 percent of Cr, 0.11-0.13 percent of V, 0.11-0.13 percent of Ni and 0.018-0.025 percent of Nb). Feeding a silicon-barium wire 40-60 m/furnace before leaving the station, wherein the leaving temperature is as follows: the initial casting heat 1640-.
In the invention, VD vacuum furnace smelting: the time of deep vacuum (less than or equal to 67MPa) is more than or equal to 15min, a manganese nitrogen line is fed according to the oxygen and nitrogen result after the air is broken, and the nitrogen is increased to 180 ppm; then feeding titanium wire to increase titanium to 0.010-0.015%, feeding sulfur wire 12-20min before the molten steel leaves the station to increase sulfur to 0.040-0.050%. The leaving-station temperature: the casting heat is 1570-. Ensuring that smelting components meet the product requirements, such as C: 0.37-0.39%, Si: 0.56-0.60%, Mn: 1.38-1.42%, Cr: 0.21-0.25%, V; 0.12-0.14%, Ni: 0.11-0.13%, Nb: 0.018 to 0.025%, Al: 0.010-0.020%, Mo: not more than 0.10%, P not more than 0.012%, N: 150-180 ppm.
In the invention, continuous casting smelting: pouring by adopting a blank mold with a certain specification, wherein the superheat degree is 15-30 ℃, the pulling speed is 0.6-9m/min, the secondary cooling water is 0.1-0.5L/kg, the distribution ratio of the secondary cooling water is 40-45/30-40/5-15/5-15, the electromagnetic stirring is 320-400A/1-10HZ, and the electromagnetic stirring at the tail end is controlled by adopting a dynamic model.
In a third aspect, the present invention provides use of the non-quenched and tempered steel of the first aspect, the use comprising: and preparing the automobile parts by using the non-quenched and tempered steel.
In the invention, the automobile parts can be an engine crankshaft, a connecting rod, a front shaft, a steering knuckle, a steering arm, a half shaft, a transmission shaft, a shaft fork, a wheel hub and the like.
Compared with the prior art, the invention at least has the following beneficial effects:
(1) the non-quenched and tempered steel provided by the invention is subjected to composite microalloy strengthening through V, Nb, Ti and N elements, and the composition of the non-quenched and tempered steel is strictly controlled, so that the (Nb) steel is formedx,Vy)(C1-xN1-y) The alloy phase strengthens the performance of non-quenched and tempered steel, simultaneously adds Ni element, and adopts a deformation control system to achieve the purposes of controlling deformation, refining the structure and improving the comprehensive performance of steel.
(2) The tensile strength of the non-quenched and tempered steel provided by the invention is 850-1000MPa, the yield strength is not less than 580MPa, the elongation A is not less than 12%, the reduction of area Z is not less than 30%, and the impact energy AKu is not less than 25J.
Detailed Description
To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:
example 1
The embodiment provides a non-quenched and tempered steel, which comprises the following components in percentage by mass: 0.38% of C, 0.57% of Si, 1.37% of Mn, 0.015% of P, 0.03% of S, 0.22% of Cr, 0.11% of V, 0.15% of Ni, 0.016% of Nb, 0.016% of N, 0.018% of Ti, and the balance of iron and inevitable impurities
The preparation method comprises the following steps:
sequentially carrying out converter smelting, LF refining, VD vacuum, continuous casting, heat treatment and rolling, and then cooling to obtain the non-quenched and tempered steel;
adding nickel element and vanadium element according to a formula in the converter smelting process;
adding niobium and titanium in the VD vacuum according to a formula;
the heat treatment comprises preheating, heating and soaking in sequence; the preheating temperature is 900 ℃; the heating temperature is 1195 ℃, and the time is 200 min; the soaking temperature is 1185 ℃, and the soaking time is 110 min;
the initial rolling temperature in the rolling process is 1100 ℃; the temperature of the inlet of the water tank in the rolling process is 985 ℃; the temperature of the rolled steel after water penetration in the rolling process is 835 ℃; the inlet temperature of a rolling mill in the rolling process is 840 ℃; the temperature of the upper cooling bed in the rolling is 785 ℃.
The properties of the obtained non-heat treated steel are detailed in Table 1.
Example 2
The embodiment provides a non-quenched and tempered steel, which comprises the following components in percentage by mass: 0.36% of C, 0.65% of Si, 1.3% of Mn, 0.005% of P, 0.02% of S, 0.3% of Cr, 0.08% of V, 0.05% of Ni, 0.02% of Nb, 0.012% of N, 0.025% of Ti, and the balance of Fe and inevitable impurities
The preparation method comprises the following steps:
sequentially carrying out converter smelting, LF refining, VD vacuum, continuous casting, heating and rolling, and then cooling to obtain the non-quenched and tempered steel;
adding nickel element and vanadium element according to a formula in the converter smelting process;
adding niobium and titanium in the VD vacuum according to a formula;
the heat treatment comprises preheating, heating and soaking in sequence; the preheating temperature is 800 ℃; the heating temperature is 1190 ℃, and the time is 260 min; the soaking temperature is 1200 ℃, and the soaking time is 100 min;
the initial rolling temperature in the rolling process is 1070 ℃; the temperature of the inlet of the water tank in the rolling process is 990 ℃; the temperature of the rolled steel after water passes through the rolled steel is 850 ℃; the inlet temperature of a rolling mill in the rolling process is 835 ℃; the temperature of the upper cooling bed in the rolling is 780 ℃.
The properties of the obtained non-heat treated steel are detailed in Table 1.
Example 3
The embodiment provides a non-quenched and tempered steel, which comprises the following components in percentage by mass: 0.4% of C, 0.5% of Si, 1.45% of Mn, 0.01% of P, 0.045% of S, 0.15% of Cr, 0.15% of V, 0.1% of Ni, 0.012% of Nb, 0.02% of N, 0.01% of Ti, and the balance of iron and inevitable impurities
The preparation method comprises the following steps:
sequentially carrying out converter smelting, LF refining, VD vacuum, continuous casting, heating and rolling, and then cooling to obtain the non-quenched and tempered steel;
adding nickel element and vanadium element according to a formula in the converter smelting process;
adding niobium and titanium in the VD vacuum according to a formula;
the heat treatment comprises preheating, heating and soaking in sequence; the preheating temperature is 700 ℃; the heating temperature is 1200 ℃, and the heating time is 150 min; the soaking temperature is 1170 ℃ and the soaking time is 120 min;
the initial rolling temperature in the rolling process is 1130 ℃; the temperature of the inlet of the water tank in the rolling process is 980 ℃; the temperature of the rolled steel after water passes through the rolled steel is 820 ℃; the inlet temperature of the rolling mill in the rolling process is 846 ℃; the temperature of the upper cooling bed in the rolling is 780 ℃.
The properties of the obtained non-heat treated steel are detailed in Table 1.
Example 4
The only difference from example 1 was that the Nb content was 0.02%, and the properties of the obtained non-heat-treated steel were as specified in Table 1.
Comparative example 1
The difference from the embodiment 1 is only that 0.02 percent of Al element is added in the preparation process in percentage by mass of the non-quenched and tempered steel; the properties of the obtained non-heat treated steel are detailed in Table 1.
Comparative example 2
The difference from example 1 is only that the content of Ti element is 0.03%; the properties of the obtained non-heat treated steel are detailed in Table 1.
Comparative example 3
The only difference from example 1 is that the content of the V element is 0.02%; the properties of the obtained non-heat treated steel are detailed in Table 1.
Comparative example 4
Only differs from example 1 in that the soaking temperature is 1000 ℃; the properties of the obtained non-heat treated steel are detailed in Table 1.
Comparative example 5
Only differs from example 1 in that the soaking temperature is 1250 ℃; the properties of the obtained non-heat treated steel are detailed in Table 1.
Comparative example 6
Only differs from example 1 in that the temperature of the initial rolling in the rolling is 900 ℃; the properties of the obtained non-heat treated steel are detailed in Table 1.
Comparative example 7
The method is different from the embodiment 1 only in that soaking is carried out for multiple times, and comprises the steps of soaking for the first time at 1000 ℃ for 1h, soaking for the second time at 1200 ℃ for 1.5h, and soaking for the second time at 1260 ℃ for 1 h; the properties of the obtained non-heat treated steel are detailed in Table 1.
In the embodiment, the forging and cooling control process is not required, and the square billet is formed by adopting the conventional continuous casting process and then rolled.
TABLE 1
As is apparent from the results of the above examples and comparative examples, the non-heat treated steel provided by the present invention is compositely microalloyed strengthened by the elements V, Nb, Ti and N while strictly controlling the composition thereof, so that the steel is formed (Nb)x,Vy)(C1-xN1-y) Alloy phase, strengthening properties of non-heat treated steelMeanwhile, Ni element is added, and a deformation control system is adopted, so that the aims of controlling deformation, refining structure and improving comprehensive performance of steel are fulfilled.
It is to be noted that the present invention is described by the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the detailed structural features, that is, it is not meant to imply that the present invention must be implemented by relying on the detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. A non-quenched and tempered steel, characterized by comprising, in mass percent: 0.36 to 0.4 percent of C, 0.5 to 0.65 percent of Si, 1.3 to 1.45 percent of Mn, less than or equal to 0.015 percent of P, 0.02 to 0.045 percent of S, 0.15 to 0.3 percent of Cr, 0.08 to 0.15 percent of V, less than or equal to 0.15 percent of Ni, 0.012 to 0.02 percent of Nb, 0.012 to 0.02 percent of N, 0.01 to 0.025 percent of Ti, and the balance of Fe and inevitable impurities.
2. The non-quenched and tempered steel of claim 1, wherein the non-quenched and tempered steel comprises, in mass percent: 0.38 to 0.39 percent of C, 0.58 to 0.62 percent of Si, 1.35 to 1.4 percent of Mn, less than or equal to 0.015 percent of P, 0.02 to 0.045 percent of S, 0.2 to 0.22 percent of Cr, 0.1 to 0.12 percent of V, less than or equal to 0.15 percent of Ni, 0.015 to 0.018 percent of Nb, 0.015 to 0.017 percent of N, 0.014 to 0.02 percent of Ti, and the balance of Fe and inevitable impurities.
3. The method of producing a non-quenched and tempered steel according to claim 1 or 2, wherein the method comprises:
sequentially carrying out converter smelting, LF refining, VD vacuum, continuous casting, heat treatment and rolling, and then cooling to obtain the non-quenched and tempered steel;
adding nickel element and vanadium element according to a formula in the converter smelting process;
and adding niobium and titanium in the VD vacuum according to a formula.
4. The production method according to claim 3, wherein the heat treatment comprises preheating, heating and soaking in this order;
preferably, the preheating temperature is less than or equal to 900 ℃;
preferably, the heating temperature is 1190-1200 ℃;
preferably, the heating time is 150-;
preferably, the soaking temperature is 1170-1200 ℃;
preferably, the soaking time is 100-120 min.
5. The method according to claim 3 or 4, wherein the temperature of the initial rolling in the rolling process is 1070-1130 ℃;
preferably, the temperature of the inlet of the water tank in the rolling process is 980-990 ℃.
6. The method according to any one of claims 3 to 5, wherein the temperature of the rolled steel after passing through water during rolling is 820 ℃ and 850 ℃.
7. The method according to any one of claims 3 to 6, wherein the mill inlet temperature during rolling is 835-846 ℃.
8. The production method as claimed in any one of claims 3 to 7, wherein the temperature of the upper cooling bed in the rolling is 780-790 ℃.
9. The method of any one of claims 3-8, comprising:
sequentially carrying out converter smelting, LF refining, VD vacuum, continuous casting, heating and rolling, and then cooling to obtain the non-quenched and tempered steel;
adding nickel element and vanadium element according to a formula in the converter smelting process;
adding niobium and titanium in the VD vacuum according to a formula;
the heat treatment comprises preheating, heating and soaking in sequence; the preheating temperature is less than or equal to 900 ℃; the heating temperature is 1190-; the soaking temperature is 1170-1200 ℃ and the time is 100-120 min;
the initial rolling temperature in the rolling process is 1070 and 1130 ℃; the temperature of the inlet of the water tank in the rolling process is 980-990 ℃; the temperature of the rolled steel after water penetration in the rolling process is 820-850 ℃; the inlet temperature of the rolling mill during the rolling is 835-846 ℃; the temperature of the upper cooling bed in the rolling is 780-790 ℃.
10. Use of the non heat-treated steel according to claim 1 or 2, wherein the use comprises: and preparing the automobile parts by using the non-quenched and tempered steel.
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Application publication date: 20220308 |