CN116397160B - Low-carbon steel and preparation method thereof - Google Patents

Low-carbon steel and preparation method thereof Download PDF

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CN116397160B
CN116397160B CN202310145815.8A CN202310145815A CN116397160B CN 116397160 B CN116397160 B CN 116397160B CN 202310145815 A CN202310145815 A CN 202310145815A CN 116397160 B CN116397160 B CN 116397160B
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hot rolling
carbon steel
low
ferrite
steel
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CN116397160A (en
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朱鹏霄
李毅
文军
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Xuzhou Construction Machinery Group Co Ltd XCMG
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Xuzhou Construction Machinery Group Co Ltd XCMG
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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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • 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
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention relates to low-carbon steel, which comprises the following ：C：0.02～0.13％,Si：0.15～0.35％,Mn：0.4～0.8％,Ni：0.005～0.020％,Mo：0.15～0.4％,Cr：0.20～0.60％,B：0.0005～0.0015％,Nb：0.01～0.05％,V：0.05～0.10％,Ti：0.03～0.15％,S：≤0.015％,P：≤0.015％, parts of iron and unavoidable impurities in balance.

Description

Low-carbon steel and preparation method thereof
Technical Field
The invention belongs to the field of steel materials, and particularly relates to low-carbon steel and a preparation method thereof, in particular to low-carbon steel with improved mechanical properties and a preparation method thereof.
Background
Along with the development of domestic and foreign economy, the engineering machinery industry has increasingly increased demands for high-strength steel plates from the viewpoints of safety, dead weight reduction and energy consumption reduction, and the usage amount of the high-strength steel accounts for about 30% in engineering machinery according to statistics. Because of the wide range of the operators in China, including severe cold areas and cold areas, and abnormal climate change, china is often affected by cold tides, the distribution of the low-temperature cold areas in winter is wider, the minimum temperature can reach 50 ℃ below zero, the steel structure works more and more universally in a low-temperature environment, the toughness of the structural steel is easily reduced at low temperature, and the steel structure is brittle broken. The related art generally adopts higher carbon and alloy element content, improves the strength of steel, but also sacrifices the plasticity and toughness, and especially in a low-temperature environment, the accidents of equipment damage are frequently caused by brittle fracture of high-strength steel. Statistics show that brittle failure caused by the low-temperature environment accounts for 30-40%, and the field open-air machinery and engineering materials are used in large quantities in aspects of mines, engineering machinery, transportation and the like, so that the risk of low-temperature brittle failure exists in winter of severe cold in the north. Therefore, development of high-strength steel with low cost, high strength, low temperature and high toughness is urgent.
Disclosure of Invention
The inventors found that the high and low temperature toughness and high strength steel of the related art is usually added with noble metal elements such as Ti, nb, mo, cr, V, ni, some rare earth elements are added, and the cost of the steel is increased.
In a first aspect, the present application provides a low carbon steel having the following ：C：0.02～0.13％,Si：0.15～0.35％,Mn：0.4～0.8％,Ni：0.005～0.020％,Mo：0.15～0.4％,Cr：0.20～0.60％,B：0.0005～0.0015％,Nb：0.01～0.05％,V：0.05～0.10％,Ti：0.03～0.15％,S：≤0.015％,P：≤0.015％, chemical components, the balance being iron and unavoidable impurities.
In some embodiments, the chemical composition of the low carbon steel has one or more of the following characteristics selected from the group consisting of C content optionally 0.05%, si content optionally 0.30%, mn content optionally 0.70%, ni content optionally 0.018%, mo content optionally 0.35%, cr content optionally 0.55%, B content optionally 0.0012%, nb content optionally 0.05%, V content optionally 0.08%, ti content optionally 0.13%, S content optionally 0.010%, p content optionally 0.010%, and the balance iron and unavoidable impurities.
In some embodiments, the chemical composition of the mild steel has one or more of the following characteristics, C content may be selected to be 0.08%, si content may be selected to be 0.25%, mn content may be selected to be 0.6%, ni content may be selected to be 0.012%, mo content may be selected to be 0.25%, cr content may be selected to be 0.40%, B content may be selected to be 0.0009%, nb content may be selected to be 0.03%, V content may be selected to be 0.07%, ti content may be selected to be 0.10%, S content may be selected to be 0.012, p content may be selected to be 0.010%, and the balance iron and unavoidable impurities.
In some embodiments, the chemical composition of the low carbon steel has one or more of the following characteristics selected from the group consisting of C content optionally 0.13%, si content optionally 0.20%, mn content optionally 0.5%, ni content optionally 0.006%, mo content optionally 0.20%, cr content optionally 0.30%, B content optionally 0.0006%, nb content optionally 0.02%, V content optionally 0.06%, ti content optionally 0.05%, S content optionally 0.008%, p content optionally 0.005%, and balance iron and unavoidable impurities.
In a second aspect, the present application provides a method of preparing low carbon steel comprising the steps of:
s1) providing a raw steel billet, wherein the raw steel billet comprises the following chemical components:
C：0.02～0.13％,Si：0.15～0.35％,Mn：0.4～0.8％,Ni：0.005～0.020％,Mo：0.15～0.4％,Cr：0.20～0.60％,B：0.0005～0.0015％,Nb：0.01～0.05％,V：0.05～0.10％,Ti：0.03～0.15％,S：≤0.015％,P：≤0.015％, The balance being iron and unavoidable impurities.
S2) hot rolling the product of the last step;
S3) heat preservation at 820-870 ℃ by using hot rolling waste heat;
s4) quenching the product of the previous step;
s5) tempering the product of the last step.
In some embodiments, in step S1, the starting billet is an ingot.
In some embodiments, in step S1, the phase structure of the raw steel billet is coarse willemite, ferrite, and pearlite.
In some embodiments, the raw steel billet is free of defects such as porosity, slag inclusion, shrinkage cavity, segregation, and the like.
In some embodiments, in step S2, hot rolling comprises:
First hot rolling: at 1100-1250 ℃;
And (3) second hot rolling: at 950-1050 ℃.
In some embodiments, in step S2, hot rolling comprises:
the deformation of each pass of the first hot rolling is 5-30%, and the total deformation is 50-80%;
the deformation of each pass of the second hot rolling is 3-20%, and the total deformation is 30-60%.
In some embodiments, in step S3, the incubation is performed at 820-870℃for a period of 1-20min.
In some embodiments, in step S3, high pressure spray quenching is performed with a liquid medium at 30-90 ℃.
In some embodiments, high pressure spray quenching may provide uniform cooling, reduced distortion, and improved steel life. The hotter quenching liquid can reduce distortion and cracking of the steel.
In some embodiments, the liquid medium is water, oil, or PAG quench liquid.
In some embodiments, in step S4, the product structure after the quenching treatment includes lath martensite and ferrite.
In some embodiments, in step S5, the tempering temperature is 500 to 600 ℃.
In some embodiments, in step S5, the tempered product structure includes tempered sorbite and ferrite.
In a third aspect, the present application provides a low carbon steel prepared by the method of any one of the preceding claims.
In some embodiments, the low carbon steel contains tempered sorbite and ferrite.
In some embodiments, the low carbon steel has a tempered sorbite content of 50-90% and a ferrite content of 10-50%.
In some embodiments, the low carbon steel has one or more of the following properties:
In some embodiments, the low carbon steel has one or more of the following properties:
description of the terms
"Acceptable impurities" refers to impurities that are permitted to exist in the steel material in accordance with international standards, national standards, industry standards, and the like, related in the art. In some embodiments, acceptable impurities may be considered unavoidable impurities. In some embodiments, the acceptable impurities have substantially no substantial effect on the properties of the steel material,
Tempered sorbite (tempered sorbite) is the transformation product of martensite when tempered at 500-600 ℃. This mixture of structure-based cementite and ferrite, called tempered sorbite
Ferrite is an interstitial solid solution formed by dissolving carbon in alpha-Fe, and is a body-centered cubic lattice.
The beneficial effects of the invention are that
One or more embodiments of the invention have one or more of the following benefits:
(1) Low carbon steel has an innovative phase structure;
(2) Low carbon steels have improved mechanical properties such as increased strength, toughness, impact energy and/or hardness;
(3) Low carbon steel has reduced costs. The method of the invention can eliminate the procedures of pre-straightening, dephosphorization and the like, and can meet the requirements of preparing low-carbon steel with excellent low-temperature toughness by various choices of quenching liquid according to the requirements.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a graphical representation of temperature versus time during the production of mild steel in accordance with some embodiments of the application.
Detailed Description
Reference will now be made in detail to specific embodiments of the invention. Examples of specific embodiments are illustrated in the accompanying drawings. While the invention will be described in conjunction with these specific embodiments, it will be understood that they are not intended to limit the invention to these specific embodiments. On the contrary, these embodiments are intended to cover alternatives, modifications and equivalents, which may be included within the spirit and scope of the invention as defined by the appended claims. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be practiced without some or all of these specific details. In other instances, well known process operations have not been described in detail in order not to unnecessarily obscure the present invention.
Example 1
The low-carbon steel with excellent low-temperature toughness comprises the following chemical components in percentage by mass, and the balance of C：0.05％,Si：0.30％,Mn：0.70％,Ni：0.018％,Mo：0.35％,Cr：0.55％,B：0.0012％,Nb：0.05％,V：0.08％,Ti：0.13％,S：0.010,P：0.010, is iron and unavoidable impurities.
S1) smelting: proportioning granular or massive raw material Fe with purity more than 99.99% and alloy elements according to a proportion, and smelting in a vacuum induction furnace to obtain cast ingots.
S2) rolling: hot rolling the cast ingot, wherein the first step is carried out at the temperature of 1230 ℃, 20% of each pass of hot rolling is carried out, and the total deformation is 60%; the second step is carried out at 1020 ℃, each pass of hot rolling is 5%, and the total deformation is 40%.
S3) heat treatment: and (3) preserving heat at 860 ℃ by using hot rolling waste heat for 3min, then performing high-pressure spray cooling by using 50 ℃ water, and then performing tempering treatment at 560 ℃ to obtain the low-carbon steel with excellent low-temperature toughness. The content of tempered sorbite in the low carbon steel was 55wt% and the content of ferrite was 45wt%.
FIG. 1 is a graphical representation of temperature versus time during the production of mild steel in accordance with some embodiments of the application. As shown in the figure, the hot rolling is divided into two steps, the first step is carried out at the temperature of 1100-1250 ℃, each pass of hot rolling is 5-30%, and the total deformation is 50-80%; the second step is carried out at 950-1050 ℃, the hot rolling is carried out at 3-20% of each pass, and the total deformation is 30-60%. And the fire is carried out by utilizing the waste heat after hot rolling, the quenching temperature is 820-870 ℃, the quenching is carried out in a two-phase zone, lath martensite and ferrite are obtained, and the tempered sorbite and ferrite are obtained after the tempering treatment at 500-600 ℃.
Example 2
The low-carbon steel with excellent low-temperature toughness comprises the following chemical components in percentage by mass, and the balance of C：0.08％,Si：0.25％,Mn：0.6％,Ni：0.012％,Mo：0.25％,Cr：0.40％,B：0.0009％,Nb：0.03％,V：0.07％,Ti：0.10％,S：0.012,P：0.010, is iron and unavoidable impurities.
S1) smelting: proportioning granular or massive raw material Fe with purity more than 99.99% and alloy elements according to a proportion, and smelting in a vacuum induction furnace to obtain cast ingots.
S2) rolling: hot rolling the cast ingot, wherein the first step is carried out at 1180 ℃ and the total deformation of 15% in each pass of hot rolling is 75%; the second step is carried out at 1000 ℃, the hot rolling is carried out at 10% per pass, and the total deformation is 50%.
S3) heat treatment: and (3) preserving heat at 850 ℃ by using hot rolling waste heat for 5min, then adopting 70 ℃ oil high-pressure jet cooling, and then carrying out tempering treatment at 540 ℃ to obtain the low-carbon steel with excellent low-temperature toughness. The content of tempered sorbite in the low carbon steel was 70wt% and the content of ferrite was 30wt%.
Example 3
The low-carbon steel with excellent low-temperature toughness comprises the following chemical components in percentage by mass, and the balance of C：0.13％,Si：0.20％,Mn：0.5％,Ni：0.006％,Mo：0.20％,Cr：0.30％,B：0.0006％,Nb：0.02％,V：0.06％,Ti：0.05％,S：0.008,P：0.005, is iron and unavoidable impurities.
S1) smelting: proportioning granular or massive raw material Fe with purity more than 99.99% and alloy elements according to a proportion, and smelting in a vacuum induction furnace to obtain cast ingots.
S2) rolling: hot rolling the cast ingot, wherein the first step is carried out at the temperature of 1130 ℃, and the total deformation is 75% after each pass of hot rolling; the second step is carried out at 980 ℃ and the total deformation of each pass of hot rolling is 15 percent.
S3) heat treatment: and (3) preserving heat at 840 ℃ by using hot rolling waste heat for 8min, then adopting PAG quenching liquid at 50 ℃ to spray and cool at high pressure, and then carrying out tempering treatment at 520 ℃ to obtain the low-carbon steel with excellent low-temperature toughness. The content of tempered sorbite in the low carbon steel was 85wt% and the content of ferrite was 15wt%.
Comparative example 1
The steel material composition of comparative example 1 is as follows:
C Si Mn Ni P S Al
0.12 0.23 1.4 / 0.007 0.003 0.035
Al Nb Ti Cr Mo B V Fe
0.035 0.04 0.03 0.5 0.3 0.002 / Allowance of
The preparation method of the steel material of comparative example 1 is as follows:
(1) And heating the slab obtained by continuous casting, descaling, rough rolling, finish rolling and pre-straightening to obtain the steel plate.
(2) And carrying out online water cooling, air cooling and tempering on the steel plate to obtain the steel material.
The steel sheets of examples and comparative examples were subjected to analytical tests, in which tensile strength, lower yield strength, elongation after break were measured according to GB/T228.1-2021, impact energy was measured according to GB/T229-2020, and hardness was measured according to GB/T230.1-2018.
As shown in table 1, the inventive low carbon steel material of example 1 has improved mechanical properties, including increased strength, toughness, impact energy and/or hardness, compared to comparative example 1.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the disclosure. The scope of the present disclosure is defined by the appended claims.

Claims (11)

1. A low-carbon steel comprises the following ：C：0.02~0.13%,Si：0.15~0.35%,Mn：0.4~0.8%,Ni：0.005~0.020%,Mo：0.15~0.4%,Cr：0.20~0.60%,B：0.0005~0.0015%,Nb：0.01~0.05％,V：0.05~0.10%,Ti：0.03~0.15%,S：≤0.015%,P：≤0.015%, chemical components of iron and unavoidable impurities in balance; the structure of the low carbon steel comprises tempered sorbite and ferrite;
The low carbon steel has the following properties:
。
2. A method of making the mild steel of claim 1, comprising the steps of:
s1) providing a raw steel billet, wherein the raw steel billet comprises the following chemical components:
C：0.02~0.13%,Si：0.15~0.35%,Mn：0.4~0.8%,Ni：0.005~0.020%,Mo：0.15~0.4%,Cr：0.20~0.60%,B：0.0005~0.0015%,Nb：0.01~0.05％,V：0.05~0.10%,Ti：0.03~0.15%,S：≤0.015%,P：≤0.015%, The balance of iron and unavoidable impurities;
S2) hot rolling the product of the last step;
S3) heat preservation at 820-870 ℃ by using hot rolling waste heat;
s4) quenching the product of the previous step;
s5) tempering the product in the last step, wherein the tempered product structure comprises tempered sorbite and ferrite.
3. The method of claim 2, wherein in step S1, the starting billet is an ingot.
4. The method according to claim 2, wherein in step S1, the phase structure of the raw steel billet is coarse willemite, ferrite, and pearlite.
5. The method according to claim 2, in step S2, the hot rolling comprising:
(1) First hot rolling: the process is carried out at 1100-1250 ℃;
(2) And (3) second hot rolling: at 950-1050 ℃.
6. The method according to claim 5, wherein in step S2, the hot rolling includes:
(1) The deformation of each pass of the first hot rolling is 5-30%, and the total deformation is 50-80%;
(2) The deformation of each pass of the second hot rolling is 3-20%, and the total deformation is 30-60%.
7. The method according to claim 2, wherein in step S3, the incubation time is 1-20min at 820-870 ℃.
8. The method according to claim 2, wherein in step S4, the high-pressure spray quenching is performed using a liquid medium at 30-90 ℃.
9. The method according to claim 2, wherein in step S4, the quenched product structure includes lath martensite and ferrite.
10. The method according to claim 2, wherein in step S5, the tempering temperature is 500-600 ℃.
11. A low carbon steel obtainable by the process of any one of claims 2 to 10, wherein the low carbon steel comprises tempered sorbite and ferrite.
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JP2003160811A (en) * 2001-11-26 2003-06-06 Nippon Steel Corp Method for manufacturing tempered high-tensile- strength steel sheet superior in toughness
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CN101096735A (en) * 2006-06-26 2008-01-02 舞阳钢铁有限责任公司 Easy-weld hardening high-strength steel plate and production method thereof

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