CN102108472A - High-carbon microalloy round steel for fracture splitting connecting rod of automotive engine and production method thereof - Google Patents
High-carbon microalloy round steel for fracture splitting connecting rod of automotive engine and production method thereof Download PDFInfo
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Abstract
The invention discloses high-carbon microalloy round steel for a fracture splitting connecting rod of an automotive engine and a production method thereof. The steel comprises the following chemical components in percentage by weight: 0.60 to 0.80 percent of C, 0.17 to 0.37 percent of Si, 0.30 to 0.90 percent of Mn, 0.020 to 0.60 percent of P, 0.050 to 0.080 percent of S, 0.015 to 0.0300 percent of N, one or several of microally elements V, Nb, Ti and B, and the balance of Fe and inevitable impurities. The production method of the high-carbon microalloy round steel comprises: (1) steel tapping by high catching carbon; (2) vacuum degassing (VD) vacuum treatment; (3) treatment in ladle furnace (LF); (4) execution of a continuous casting process; and (5) heating and rolling of continuously cast blank, and execution of a segmental cooling process of high-temperature quick cooling and low-temperature slow cooling. The high-carbon microalloy round steel provided by the invention has the characteristics of high cleanness, small composition segregation, low crack sensitivity, uniform and fine texture and high surface quality, and the provided production method has the characteristics of low production cost, energy conservation, simple process route, high maneuverability and simplicity of control.
Description
Technical field
The present invention relates to metallurgy industry microalloy cracking connecting-rod production field, particularly relate to a kind of high carbon microalloy round steel and production method thereof that is used for the motor car engine cracking connecting-rod.
Background technology
Along with the continuous aggravation of competition, the novel process of automobile industry, novel material and new installation continue to bring out.Now, cracking technology has caused showing great attention to of automobile factory as a kind of brand-new engine link manufacturing process.Compare with traditional connecting rod manufacture method, cracking technology have shorten the production cycle, reduce operation, low and reduce advantage such as connecting rod manufacturing expense to the producing apparatus dependency.
Be applied to the higher intensity of the cracking connecting-rod material require of motor car engine, the low deformability in the cracking process and suitable fragility and higher machinability.Usually the microalloying that improves carbon content and nitrogen is the effective means that improves hardness of steel, and Xiang Gangzhong adds certain sulphur, can effectively improve the machinability of steel.Yet they also are the principal elements that causes strand component segregation, crackle and tissue odds even.Therefore, the process procedures such as the accurate control of learning composition, component segregation, sulfide morphology control, hot rolling microstructure control that narrow are to realize the key factor of high carbon microalloy cracking connecting-rod with steel.
At present, foreign-made microalloy round steel mainly adopts arc melting step and secondary refining step and continuous casting process step to be used, or the converter smelting step cooperates with secondary refining step and continuous casting process step and produces.These technical maturities and reliable product quality have been substituted the production technique that arc melting matches with die casting.The external manufacturer that produces the microalloy round steel mainly contains: many factories: 70tEAF-LF-RH-CC (arc 2 streams, the vertical 4 stream circle base Φ 70-350 of 370mm * 480mm/)-breaking down cogging is known by Japanese Datong District; Aichi, Janpan is known many factories: 80tEAF-LF-RH-CC (370mm * 480mm or 185mm * 185mm)-breaking down cogging or tandem rolling; The little storehouse of SUMITOMO CHEMICAL: KR-70BOF-70tVAD/RH-CC (410mm * 560mm).The producer of domestic production microalloy forged steel mainly is a part special steel factory, and for example the full special steel in north, Baosteel special steel, Shoudu Iron and Steel Co special steel, Kweiyang special steel, Chongqing special steel and emerging clear special steel etc. can produced in small quantities, and the production technique that adopts electric furnace to match with die casting more.Have only minority steel mill to grope the continuous casting process of part microalloy forged steel, its technical process is respectively: the full special steel in north: 30EAF-EBT-40tLF-3.15t ingot steel casting; Kweiyang special steel: 60tEAF-LF-CC; The Laiwu iron and steel: 15tEAF-steel ladle bottom argon blowing refining-685kg steel ingot, but their common shortcoming is a unstable product quality.
During the microalloy round steel that domestic special steel factory produces is mainly, the low-carbon microalloy round steel, comprise 30MnVS, 35MnVS, 35MnVSiN, 45MnS25, SAE1141 etc., carbon content is 0.25～0.50% in its steel, also contain element and microalloy element V, Nb, Ti etc. such as higher sulphur, nitrogen, compare the component segregation of middle low-carbon microalloy round steel, the easier control of crack sensitivity with high carbon microalloy round steel.
Therefore, develop that a kind of component segregation is few, the crackle susceptibility is low, evenly and the high carbon microalloy round steel of thinning microstructure, become urgent requirement with the needs that satisfy the connecting rod cracking technology.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of above-mentioned background technology, a kind of high carbon microalloy round steel that is used for the motor car engine cracking connecting-rod is provided, make that it has that component segregation is few, the crackle susceptibility is low, the characteristics of homogeneous microstructure and refinement.
When another object of the present invention is the rate of recovery of S in guaranteeing steel, reduce oxygen level in the steel; Reduce component segregation of continuous casting slab and crackle tendency by control continuous casting cooling system and retarded cooling process; Come refinement and uniform formation by controlled rolling and process for cooling, thereby solve the production problem of high carbon microalloy round steel.
A kind of high carbon microalloy round steel that is used for the motor car engine cracking connecting-rod provided by the invention, the chemical component weight per-cent of this steel is C:0.60～0.80%, Si:0.17～0.37%, Mn:0.30～0.90%, P:0.020～0.060%, S:0.050～0.080%, N:0.015～0.0300%, also contain one or more of microalloy element V, Nb, Ti, B, surplus is Fe and unavoidable impurities.
In technique scheme, the chemical component weight per-cent of described this steel is C:0.70%, Si:0.27%, Mn:0.60%, P:0.040%, S:0.065%, N:0.0225%, also contain one or more of microalloy element V, Nb, Ti, B, surplus is Fe and unavoidable impurities.
A kind of production method that is used for the high carbon microalloy round steel of motor car engine cracking connecting-rod provided by the invention, its production technique is made up of following step:
(1) adopt high catch carbon tapping, the tapping carbon content is controlled at 0.50～0.60%, adds aluminium block behind the stove in ladle and Ba-Ca-Si carries out pre-deoxidation, and wherein the aluminium block add-on is that 0.5～0.7kg/t, Ba-Ca-Si add-on are 1.5～2.0kg/t; Other are alloy and slag making materials;
(2) VD vacuum-treat, the following dwell time 〉=15min of 67Pa, vacuum time 〉=30min;
(3) the LF ladle furnace carries out composition adjustment (comprising S, N and microalloy element) and further refining treatment, guarantees that the tapping oxygen level is lower than 15ppm;
(4) continuous casting process of employing induction stirring and weak cold system, the battery stir current is 300～400A, frequency is 6～7HZ; The crystallizer cooling water inflow is 1950～2050L/min, sufficient roller section in the secondary cooling zone, active segment, fixedly the I section, fixedly the cooling water inflow of II section is respectively 28L/min, 28L/min, 15L/min, 10L/min, casting speed is 0.8～1.0m/min, and the continuously cast bloom straightening temperature is 800～900 ℃;
(5) adopt stage by stage that heating technique heats continuous casting square billet, the fs: 0～750 ℃, rate of heating is 10 ℃/min, subordinate phase: 750～1220 ℃, rate of heating is 15 ℃/min, and the phase III: 1220 ℃ of insulations, soaking time are 45min.Rolling start rolling temperature is controlled at 1050～1080 ℃, and final rolling temperature is controlled at 950～980 ℃; Roll the back and adopt that high temperature is cold soon, the segmentation process for cooling of low temperature slow cooling, the cooling fs, be chilled to 650 ℃ after the finish rolling soon, 50 ℃/min of speed of cooling, subordinate phase slowly cools to room temperature for 650 ℃, 0.15 ℃/min of speed of cooling.
In technique scheme, the tapping carbon content of high catch carbon tapping is controlled at 0.55%, and the aluminium block add-on is that 0.6kg/t, Ba-Ca-Si add-on are 1.75kg/t during pre-deoxidation; Other are alloy and slag making materials.
In technique scheme, the following dwell time of 67Pa is 20min in the VD vacuum-treat, and vacuum time is 40min.
In technique scheme, the battery stir current is 350A in the continuous casting process of employing induction stirring and weak cold system, and frequency is 6.5HZ, and the crystallizer cooling water inflow is 2000L/min; Sufficient roller section in the secondary cooling zone, active segment, fixedly the I section, fixedly the casting speed of II section is 0.9m/min, the continuously cast bloom straightening temperature is 850 ℃.
In technique scheme, adopt after heating technique heats continuous casting square billet stage by stage, rolling start rolling temperature is controlled at 1065 ℃, and final rolling temperature is controlled at 965 ℃.
Beneficial effect: the high carbon microalloy round steel that is used for the motor car engine cracking connecting-rod provided by the invention is compared with existing high carbon microalloy round steel, and the cleanliness factor height, component segregation is little, the crackle susceptibility is low, homogeneous microstructure and refinement, surface quality are good.
The production method that is used for the high carbon microalloy round steel of motor car engine cracking connecting-rod provided by the invention is compared with existing high carbon microalloy round steel technology, and production cost of the present invention is low, save energy; And operational path is simple, and is workable, is easy to control.
Embodiment
The present invention is described in further detail below in conjunction with embodiment, but this embodiment should not be construed as limitation of the present invention.
Embodiment 1
The chemical component weight per-cent that the present invention is used for the high carbon microalloy round steel of motor car engine cracking connecting-rod is C:0.60%, Si:0.17%, Mn:0.30%, P:0.020%, S:0.050%, N:0.015% also contains one or more of microalloy element V, Nb, Ti, B, and surplus is Fe and unavoidable impurities.
Production is used for the production method of the high carbon microalloy round steel of motor car engine cracking connecting-rod, comprises electrocardio stove on the low side-VD vacuum-treat stove-LF ladle furnace-continuous casting-rolling-technology for controlled cooling, and its concrete production stage is made up of following step:
(1) adopt high catch carbon tapping, the tapping carbon content is controlled at 0.50%, adds aluminium block behind the stove in ladle and Ba-Ca-Si carries out pre-deoxidation, and wherein the aluminium block add-on is that 0.5kg/t, Ba-Ca-Si add-on are 1.5kg/t; Other are alloy and slag making materials;
(2) VD vacuum-treat, the following dwell time 15min of 67Pa, vacuum time 30min;
(3) the LF ladle furnace carries out composition adjustment (comprising S, N and microalloy element) and further refining treatment, guarantees that the tapping oxygen level is lower than 15ppm;
(4) continuous casting process of employing induction stirring and weak cold system, the battery stir current is 300A, frequency is 6HZ; The crystallizer cooling water inflow is 1950L/min, sufficient roller section in the secondary cooling zone, active segment, fixedly the I section, fixedly the cooling water inflow of II section is respectively 28L/min, 28L/min, 15L/min, 10L/min, casting speed is 0.8m/min, and the continuously cast bloom straightening temperature is 800 ℃;
(5) adopt stage by stage that heating technique heats continuous casting square billet, the fs: 0～750 ℃, rate of heating is 10 ℃/min, subordinate phase: 750～1220 ℃, rate of heating is 15 ℃/min, and the phase III: 1220 ℃ of insulations, soaking time are 45min.Rolling start rolling temperature is controlled at 1050 ℃, and final rolling temperature is controlled at 950 ℃; Roll the back and adopt that high temperature is cold soon, the segmentation process for cooling of low temperature slow cooling, the cooling fs, be chilled to 650 ℃ after the finish rolling soon, 50 ℃/min of speed of cooling, subordinate phase slowly cools to room temperature for 650 ℃, 0.15 ℃/min of speed of cooling.
That adopts that high carbon microalloy round steel provided by the invention production produced contains V, N, the high carbon microalloy round steel of S, its continuously cast bloom macrostructure; Central pipe is 0.5 grade, and center porosity is 0.5 grade, and non-metallic inclusion is 0 grade; Component segregation: the C segregation is 1.02 (the 70 steel C segregations that carbon content is suitable are 1.05); The S segregation is 1.04 (the C1118 steel S segregation that sulphur content is suitable is 1.06)
That adopts that high carbon microalloy round steel production method provided by the invention produced contains V, N, the high carbon microalloy round steel of S, its hot rolled circular steel any surface finish, flawless; Autstenitic grain size 〉=7.5 grade, non-metallic inclusion: 3 grades of category-As, category-B≤1.0 grade, C class≤0.5 grade, 0 grade of D class.[O]≤12ppm in the steel, [H]≤1.5ppm.
Embodiment 2
The chemical component weight per-cent that the present invention is used for the high carbon microalloy round steel of motor car engine cracking connecting-rod is C:0.70%, Si:0.27%, Mn:0.60%, P:0.040%, S:0.065%, N:0.0225% also contains one or more of microalloy element V, Nb, Ti, B, and surplus is Fe and unavoidable impurities.
Production is used for the production method of the high carbon microalloy round steel of motor car engine cracking connecting-rod, comprises electrocardio stove on the low side-VD vacuum-treat stove-LF ladle furnace-continuous casting-rolling-technology for controlled cooling, and its concrete production stage is made up of following step:
(1) the tapping carbon content of high catch carbon tapping is controlled at 0.55%, adds aluminium block behind the stove in ladle and Ba-Ca-Si carries out pre-deoxidation, and wherein the aluminium block add-on is that 0.6kg/t, Ba-Ca-Si add-on are 1.75kg/t; Other are alloy and slag making materials.
(2) VD vacuum-treat, the following dwell time 20min of 67Pa, vacuum time 40min;
(3) the LF ladle furnace carries out composition adjustment (comprising S, N and microalloy element) and further refining treatment, guarantees that the tapping oxygen level is lower than 15ppm;
(4) continuous casting process of employing induction stirring and weak cold system, the battery stir current is 350A, frequency is 6.5HZ; The crystallizer cooling water inflow is 2000L/min, sufficient roller section in the secondary cooling zone, active segment, fixedly the I section, fixedly the cooling water inflow of II section is respectively 28L/min, 28L/min, 15L/min, 10L/min, casting speed is 0.9m/min, and the continuously cast bloom straightening temperature is 850 ℃;
(5) adopt stage by stage that heating technique heats continuous casting square billet, the fs: 0～750 ℃, rate of heating is 10 ℃/min, subordinate phase: 750～1220 ℃, rate of heating is 15 ℃/min, and the phase III: 1220 ℃ of insulations, soaking time are 45min.Rolling start rolling temperature is controlled at 1065 ℃, and final rolling temperature is controlled at 965 ℃; Roll the back and adopt that high temperature is cold soon, the segmentation process for cooling of low temperature slow cooling, the cooling fs, be chilled to 650 ℃ after the finish rolling soon, 50 ℃/min of speed of cooling, subordinate phase slowly cools to room temperature for 650 ℃, 0.15 ℃/min of speed of cooling.
That adopts that high carbon microalloy round steel provided by the invention production produced contains V, N, the high carbon microalloy round steel of S, its continuously cast bloom macrostructure; Central pipe is 0.5 grade, and center porosity is 0.5 grade, and non-metallic inclusion is 0 grade; Component segregation: the C segregation is 1.02 (the 70 steel C segregations that carbon content is suitable are 1.05); The S segregation is 1.04 (the C1118 steel S segregation that sulphur content is suitable is 1.06)
That adopts that high carbon microalloy round steel production method provided by the invention produced contains V, N, the high carbon microalloy round steel of S, its hot rolled circular steel any surface finish, flawless; Autstenitic grain size 〉=7.5 grade, non-metallic inclusion: 3 grades of category-As, category-B≤1.0 grade, C class≤0.5 grade, 0 grade of D class.[O]≤12ppm in the steel, [H]≤1.5ppm.
Embodiment 3
The chemical component weight per-cent that the present invention is used for the high carbon microalloy round steel of motor car engine cracking connecting-rod is C:0.80%, Si:0.37%, Mn:0.90%, P:0.060%, S:0.080%, N:0.0300% also contains one or more of microalloy element V, Nb, Ti, B, and surplus is Fe and unavoidable impurities.
Production is used for the production method of the high carbon microalloy round steel of motor car engine cracking connecting-rod, comprises electrocardio stove on the low side-VD vacuum-treat stove-LF ladle furnace-continuous casting-rolling-technology for controlled cooling, and its concrete production stage is made up of following step:
(1) adopt high catch carbon tapping, the tapping carbon content is controlled at 0.60%, adds aluminium block behind the stove in ladle and Ba-Ca-Si carries out pre-deoxidation, and wherein the aluminium block add-on is that 0.7kg/t, Ba-Ca-Si add-on are 2.0kg/t; Other are alloy and slag making materials;
(2) VD vacuum-treat, the following dwell time 25min of 67Pa, vacuum time 50min;
(3) the LF ladle furnace carries out composition adjustment (comprising S, N and microalloy element) and further refining treatment, guarantees that the tapping oxygen level is lower than 15ppm;
(4) continuous casting process of employing induction stirring and weak cold system, the battery stir current is 400A, frequency is 7HZ; The crystallizer cooling water inflow is 2050L/min, sufficient roller section in the secondary cooling zone, active segment, fixedly the I section, fixedly the cooling water inflow of II section is respectively 28L/min, 28L/min, 15L/min, 10L/min, casting speed is 1.0m/min, and the continuously cast bloom straightening temperature is 900 ℃;
(5) adopt stage by stage that heating technique heats continuous casting square billet, the fs: 0～750 ℃, rate of heating is 10 ℃/min, subordinate phase: 750～1220 ℃, rate of heating is 15 ℃/min, and the phase III: 1220 ℃ of insulations, soaking time are 45min.Rolling start rolling temperature is controlled at 1080 ℃, and final rolling temperature is controlled at 980 ℃; Roll the back and adopt that high temperature is cold soon, the segmentation process for cooling of low temperature slow cooling, the cooling fs, be chilled to 650 ℃ after the finish rolling soon, 50 ℃/min of speed of cooling, subordinate phase slowly cools to room temperature for 650 ℃, 0.15 ℃/min of speed of cooling.
That adopts that high carbon microalloy round steel provided by the invention production produced contains V, N, the high carbon microalloy round steel of S, its continuously cast bloom macrostructure; Central pipe is 0.5 grade, and center porosity is 0.5 grade, and non-metallic inclusion is 0 grade; Component segregation: the C segregation is 1.02 (the 70 steel C segregations that carbon content is suitable are 1.05); The S segregation is 1.04 (the C1118 steel S segregation that sulphur content is suitable is 1.06)
That adopts that high carbon microalloy round steel production method provided by the invention produced contains V, N, the high carbon microalloy round steel of S, its hot rolled circular steel any surface finish, flawless; Autstenitic grain size 〉=7.5 grade, non-metallic inclusion: 3 grades of category-As, category-B≤1.0 grade, C class≤0.5 grade, 0 grade of D class.[O]≤12ppm in the steel, [H]≤1.5ppm.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
The content that is not described in detail in this specification sheets belongs to this area professional and technical personnel's known prior art.
Claims (7)
1. high carbon microalloy round steel that is used for the motor car engine cracking connecting-rod, it is characterized in that: the chemical component weight per-cent of this steel is C:0.60～0.80%, Si:0.17～0.37%, Mn:0.30～0.90%, P:0.020～0.060%, S:0.050～0.080%, N:0.015～0.0300%, also contain one or more of microalloy element V, Nb, Ti, B, surplus is Fe and unavoidable impurities.
2. the high carbon microalloy round steel that is used for the motor car engine cracking connecting-rod according to claim 1, it is characterized in that: the chemical component weight per-cent of described this steel is C:0.70%, Si:0.27%, Mn:0.60%, P:0.040%, S:0.065%, N:0.0225%, also contain one or more of microalloy element V, Nb, Ti, B, surplus is Fe and unavoidable impurities.
3. produce a kind of production method that is used for the high carbon microalloy round steel of motor car engine cracking connecting-rod as claimed in claim 1, it is characterized in that: its production technique is made up of following step:
(1) adopt high catch carbon tapping, the tapping carbon content is controlled at 0.50～0.60%, adds aluminium block behind the stove in ladle and Ba-Ca-Si carries out pre-deoxidation, and wherein the aluminium block add-on is that 0.5～0.7kg/t, Ba-Ca-Si add-on are 1.5～2.0kg/t; Other are alloy and slag making materials;
(2) VD vacuum-treat, the following dwell time 〉=15min of 67Pa, vacuum time 〉=30min;
(3) the LF ladle furnace carries out composition adjustment (comprising S, N and microalloy element) and further refining treatment, guarantees that the tapping oxygen level is lower than 15ppm;
(4) continuous casting process of employing induction stirring and weak cold system, the battery stir current is 300～400A, frequency is 6～7HZ; The crystallizer cooling water inflow is 1950～2050L/min, sufficient roller section in the secondary cooling zone, active segment, fixedly the I section, fixedly the cooling water inflow of II section is respectively 28L/min, 28L/min, 15L/min, 10L/min, casting speed is 0.8～1.0m/min, and the continuously cast bloom straightening temperature is 800～900 ℃;
(5) adopt stage by stage that heating technique heats continuous casting square billet, the fs: 0～750 ℃, rate of heating is 10 ℃/min, subordinate phase: 750～1220 ℃, rate of heating is 15 ℃/min, and the phase III: 1220 ℃ of insulations, soaking time are 45min; Rolling start rolling temperature is controlled at 1050～1080 ℃, and final rolling temperature is controlled at 950～980 ℃; Roll the back and adopt that high temperature is cold soon, the segmentation process for cooling of low temperature slow cooling, the cooling fs, be chilled to 650 ℃ after the finish rolling soon, 50 ℃/min of speed of cooling, subordinate phase slowly cools to room temperature for 650 ℃, 0.15 ℃/min of speed of cooling.
4. a kind of production method that is used for the high carbon microalloy round steel of motor car engine cracking connecting-rod according to claim 3, it is characterized in that: the tapping carbon content of high catch carbon tapping is controlled at 0.55%, and the aluminium block add-on is that 0.6kg/t, Ba-Ca-Si add-on are 1.75kg/t during pre-deoxidation; Other are alloy and slag making materials.
5. a kind of production method that is used for the high carbon microalloy round steel of motor car engine cracking connecting-rod according to claim 3 is characterized in that: the following dwell time of 67Pa is 20min in the VD vacuum-treat, and vacuum time is 40min.
6. a kind of production method that is used for the high carbon microalloy round steel of motor car engine cracking connecting-rod according to claim 3, it is characterized in that: the battery stir current is 350A in the continuous casting process of employing induction stirring and weak cold system, frequency is 6.5HZ, and the crystallizer cooling water inflow is 2000L/min; Sufficient roller section in the secondary cooling zone, active segment, fixedly the I section, fixedly the casting speed of II section is 0.9m/min, the continuously cast bloom straightening temperature is 850 ℃.
7. a kind of production method that is used for the high carbon microalloy round steel of motor car engine cracking connecting-rod according to claim 3, it is characterized in that: adopt after heating technique heats continuous casting square billet stage by stage, rolling start rolling temperature is controlled at 1065 ℃, and final rolling temperature is controlled at 965 ℃.
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Application publication date: 20110629 |