CN113549814B - Carburization super wear-resistant slag extractor chain steel - Google Patents

Carburization super wear-resistant slag extractor chain steel Download PDF

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CN113549814B
CN113549814B CN202110686054.8A CN202110686054A CN113549814B CN 113549814 B CN113549814 B CN 113549814B CN 202110686054 A CN202110686054 A CN 202110686054A CN 113549814 B CN113549814 B CN 113549814B
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CN113549814A (en
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黄永建
孙晓明
武兴旺
丁辉
戴观文
李元
王国营
李冠军
李福勇
张士乾
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China Coal Zhangjiakou Coal Mining Machinery Co Ltd
Shijiazhuang Iron and Steel Co Ltd
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China Coal Zhangjiakou Coal Mining Machinery Co Ltd
Shijiazhuang Iron and Steel Co Ltd
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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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
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  • Heat Treatment Of Articles (AREA)
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Abstract

A carburization super wear-resistant slag discharging machine chain steel belongs to the technical field of metallurgy. The chain steel comprises the following chemical components in percentage by mass: c:0.09 to 0.13%, si:0.15 to 0.35%, mn: 0.40-0.60%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, cr:1.40 to 1.70%, ni:1.40 to 1.70%, mo:0.25 to 0.35%, cu:0.08 to 0.12%, al:0.020 to 0.050 percent, and the balance of iron and inevitable impurities. The chain steel has good welding performance, and the carburized chain processed by the chain steel has surface hardness and core hardness of not less than 550HV effective hardened layer depth, breaking load and breaking elongation which are excellent.

Description

Chain steel of carburizing super wear-resistant slag discharging machine
Technical Field
The invention belongs to the technical field of metallurgy, and relates to chain steel, in particular to carburization super-wear-resistant slag extractor chain steel.
Background
With the continuous progress of the thermal power technology in China, the generator set is increasingly developed in a large-scale direction. The problem of rapid abrasion of a chain of the slag extractor or breakage of the chain seriously influences the operation safety of the unit. The slag tapping chain is divided into two series of high strength and high hardness according to the performance characteristics of the product. The high-strength chain has the defects of low hardness, quick abrasion, high chain intercepting frequency, large overhauling workload and the like; the high-hardness chain has the characteristics of high hardness, slow abrasion, small maintenance workload and long service life. At present, the high-hardness chain has no special standard and is generally made of carburizing steel. The 23MnNiMoCr54 is used for producing high-hardness chains by the Parson chain division company (hereinafter referred to as Parson) of the coal mining machinery Limited liability company of the middlings family mouth before 2011, and the steel is designed as steel for a mining chain, so that the steel is not actually suitable for a carburized slag chain. Since 2011, shijiazhuang Steel Limited liability company (hereinafter referred to as "Stone Steel") and Parssen developed 17CrNiMo6 and 15CrNi6 steels as steels for carburizing slag chain. Over the years of use, 17CrNiMo6 and 15CrNi6 have exposed the following problems during production and practical use: the surface hardness of the chain after carburization sometimes does not reach the requirement of more than or equal to 800HV, the core hardness is higher (more than or equal to 400 HV), and particularly for the chain with the diameter of more than or equal to 30mm, the core hardness is higher, so that the chain has poor plastic toughness and low breaking strength.
Disclosure of Invention
In order to solve the technical problem, the invention provides the carburized super wear-resistant slag extractor chain steel which has good welding performance, and the carburized chain processed by the carburized chain steel has surface hardness and core hardness, the effective hardening layer depth of not less than 550HV, and excellent breaking load and breaking elongation.
The technical scheme adopted by the invention is as follows:
a carburized super wear-resistant slag discharging machine chain steel comprises the following chemical components in percentage by mass: c:0.09 to 0.13%, si:0.15 to 0.35%, mn: 0.40-0.60%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, cr:1.40 to 1.70%, ni:1.40 to 1.70%, mo:0.25 to 0.35%, cu:0.08 to 0.12%, al: 0.020-0.050% and the balance of iron and inevitable impurities.
The chain steel is delivered in an annealed state.
The chain steel structure is a sorbite with carbide particles dispersed on a ferrite matrix.
The chain steel has annealing hardness of 180-230HBW and is qualified in a 180-degree cold bending test.
After the chain steel sample blank with the diameter of 15mm is quenched at 870 ℃ and tempered at 200 ℃, the mechanical property of the chain steel sample blank meets the following tensile strength Rm: 1021-1117 MPa, yield strength ReL: 763-864 MPa, elongation after break A:12 to 16.5%, reduction of area Z: 64-71%, normal temperature impact energy KV2:137 to 214J.
The chain steel has the following functions of alloy elements in the components:
c: the carbon content in the steel increases and the yield strength and tensile strength increase, but the plasticity, toughness and welding performance of the steel are not influenced. In order to ensure the plasticity, toughness and weldability of the chain steel, the carbon content is not high. The carbon content of the invention is controlled between 0.09 and 0.13 percent.
Si: silicon increases the strength of solid solution in steel and the degree of cold work hardening, which reduces the toughness and plasticity of steel, and increases the amount of silicon, which reduces the weldability of steel. The Si content of the invention is controlled between 0.15 and 0.35 percent.
Mn: is an element for improving the hardenability of steel, and the manganese has obvious effect on improving the strength of low-carbon steel and medium-carbon steel. However, when the Mn content is too high, the carbon equivalent thereof is increased to deteriorate the weldability, and the Mn content is controlled to 0.40 to 0.60% in the present invention.
Cr: chromium can significantly improve the strength, hardness and wear resistance, but simultaneously reduces the plasticity and toughness; chromium also improves the oxidation and corrosion resistance of the steel. The invention controls the Cr content to be 1.40-1.70%.
Ni: nickel increases the strength of the steel while maintaining good ductility and toughness. The nickel has higher corrosion resistance to acid and alkali and has antirust and heat-resisting capabilities at high temperature. The content of the invention is controlled to be 1.40-1.70%.
Mo: molybdenum can refine the crystal grains of the steel, improve hardenability and heat strength, and maintain sufficient strength and creep resistance at high temperature. The addition of molybdenum to the structural steel can improve the mechanical properties. Mo can also suppress brittleness of the alloy steel due to quenching. However, the addition of too much will significantly increase the carbon equivalent of the material and thus adversely affect the flash welding performance of the chain steel. In addition, mo is also a precious metal, and too high content increases cost. The content of Mo in the invention is controlled to be 0.25-0.35%.
Cu: copper improves strength and toughness, especially atmospheric corrosion performance. However, the excessively high Cu content is not favorable for the weldability of the steel, and also tends to cause copper embrittlement, which deteriorates the surface properties of the steel, and the Cu content is controlled to 0.08 to 0.12% in the present invention.
P: in general, P is a harmful element in steel, increases the cold brittleness of the steel, deteriorates the welding performance, reduces the plasticity, and deteriorates the cold bending performance, and the content of P is controlled to be less than or equal to 0.015 percent.
S: sulfur is also a harmful element in general. Hot shortness of the steel is generated, ductility and toughness of the steel are reduced, and cracks are generated during forging and rolling. The sulfur is also unfavorable for welding performance, the corrosion resistance is reduced, and the S content is controlled to be less than or equal to 0.015 percent.
Al: aluminum is a commonly used deoxidizer in steel. A small amount of aluminum is added into the steel, so that crystal grains can be refined, and the impact toughness is improved. The content of the invention is controlled to be 0.020-0.050%.
The invention reduces the carbon content, finely adjusts the contents of Si and Cr, puts forward the restriction requirements on the contents of Al, cu, P and S, improves the welding performance of the chain ring through reasonable component design, reduces the core hardness, and improves the surface hardness, the breaking strength and the plastic toughness. The chain steel has excellent welding performance and stable quality index and is approved by users.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The chain steel of the carburizing super wear-resistant slag discharging machine comprises the following chemical components in percentage by mass: c:0.09 to 0.13%, si:0.15 to 0.35%, mn: 0.40-0.60%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, cr:1.40 to 1.70%, ni:1.40 to 1.70%, mo:0.25 to 0.35%, cu:0.08 to 0.12%, al:0.020 to 0.050 percent, and the balance of iron and inevitable impurities.
The chain steel is produced by the following method: comprises the working procedures of converter/electric furnace smelting, LF refining, vacuum degassing, continuous casting, continuous rolling and annealing. The rolling compression ratio of the continuous rolling procedure is more than or equal to 19.8, the initial rolling temperature is 1000-1060 ℃, and the rolled steel is cooled in a heap way. The annealing process is carried out in a continuous annealing furnace, the steel stays for more than 4.8h at 650-680 ℃ in a high-temperature transition zone of the continuous annealing furnace, then is slowly cooled at a cooling speed of less than or equal to 30 ℃/h, the tapping temperature of the steel is less than or equal to 550 ℃, then is naturally cooled, and is bundled and put in storage after being straightened.
The metallographic structure of the chain steel obtained by the component design and production method is a sorbite with carbide particles dispersed on a ferrite matrix, the annealing hardness is 180-230HBW, and the 180-degree cold bending test is qualified.
After the chain steel sample blank with the diameter of 15mm is quenched at 870 ℃ and tempered at 200 ℃, the mechanical property of the chain steel sample blank meets the requirements of tensile strength Rm: 1021-1117 MPa, yield strength ReL: 763-864 MPa, elongation after fracture A:12 to 16.5%, reduction of area Z: 64-71%, normal temperature impact energy KV2:137 to 214J.
The chemical components and the mass percentage of the chain steel in the examples 1 to 11 are shown in a table 1, the control of the main process parameters in the production process is shown in a table 2, and the mechanical properties are shown in a table 3.
The chain steels obtained in examples 1 to 11 were processed into a shape of a slag chain part and subjected to a carburizing heat treatment process, and the mechanical properties of the obtained carburized slag chain are shown in table 4.
TABLE 1 chemical composition and mass% of chain steel for each example
Figure DEST_PATH_IMAGE001
Table 2 Main technological parameters of the chain steel production process of each embodiment
Figure 970913DEST_PATH_IMAGE002
TABLE 3 mechanical properties of chain steel of each example
Figure DEST_PATH_IMAGE003
TABLE 4 mechanical properties of carburized slag chain in examples
Figure 576469DEST_PATH_IMAGE004
In order to embody the technical effect of the invention, the steel grade of the invention is compared with the 17CrNiMo6 steel in performance,
the chemical compositions of the two are compared and shown in Table 5. The two steels were processed into slag chain parts of the same specification and treated in the same furnace under the carburizing heat treatment process, and the mechanical properties of the obtained carburizing slag chain were compared and are shown in table 6.
TABLE 5 chemical compositions and mass percent of the steel grade of the invention and the 17CrNiMo6 steel (%)
Figure DEST_PATH_IMAGE005
TABLE 6 comparison table of mechanical properties of carburized slag-out chain of steel grade of the invention and 17CrNiMo6 steel
Figure 293889DEST_PATH_IMAGE006
As can be seen from Table 6, the performance index of the carburized chain of the steel grade of the invention is obviously improved compared with that of 17CrNiMo6 steel by the same furnace treatment under the carburization heat treatment process, and the welding performance of the steel grade of the invention is better.

Claims (3)

1. The chain steel for the carburizing super wear-resistant slag discharging machine is characterized by comprising the following chemical components in percentage by mass: c:0.09 to 0.11%, si:0.15 to 0.35%, mn: 0.40-0.60%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, cr:1.40 to 1.70%, ni:1.40 to 1.70%, mo:0.25 to 0.32%, cu:0.08 to 0.12%, al: 0.020-0.050%, and the balance of iron and inevitable impurities;
the chain steel is delivered in an annealed state;
the chain steel is produced by the following method: comprises the working procedures of converter/electric furnace smelting, LF refining, vacuum degassing, continuous casting, continuous rolling and annealing; the rolling compression ratio of the continuous rolling procedure is more than or equal to 19.8, the initial rolling temperature is 1000-1060 ℃, and the rolling is carried out and then the cold is piled; the annealing process is carried out in a continuous annealing furnace, the steel stays for more than 4.8 hours in a high-temperature transition zone of the continuous annealing furnace at 650-680 ℃, then is slowly cooled at a cooling speed of less than or equal to 30 ℃/h, the tapping temperature of the steel is less than or equal to 550 ℃, then is naturally cooled, and is bundled and put into a warehouse after being straightened;
the chain steel structure is a sorbite with carbide particles dispersed on a ferrite matrix.
2. The carburized super wear-resistant slag extractor chain steel according to claim 1, wherein the chain steel has an annealing hardness of 180-230HBW and a 180 ° cold bending test passing.
3. The carburized super wear-resistant slag extractor chain steel of claim 2, wherein mechanical properties of a test sample blank with a diameter of 15mm, which is quenched at 870 ℃ and tempered at 200 ℃, meet tensile strength Rm: 1021-1117 MPa, yield strength ReL: 763-864 MPa, elongation after break A: 12-16.5%, reduction of area Z: 64-71%, normal temperature impact energy KV2:137 to 214J.
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