CN117568710A - High-fatigue-performance steel for bimetal saw blade backing material and production method thereof - Google Patents

High-fatigue-performance steel for bimetal saw blade backing material and production method thereof Download PDF

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Publication number
CN117568710A
CN117568710A CN202311449356.9A CN202311449356A CN117568710A CN 117568710 A CN117568710 A CN 117568710A CN 202311449356 A CN202311449356 A CN 202311449356A CN 117568710 A CN117568710 A CN 117568710A
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steel
percent
saw blade
blade backing
high fatigue
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Inventor
李国仓
梁亮
曾斌
汪净
严立新
邓必荣
齐江华
罗钢
田飞
郑庆
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Hunan Valin Lianyuan Iron & Steel Co Ltd
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Hunan Valin Lianyuan Iron & 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific 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
    • C21D11/00—Process control or regulation for heat treatments
    • 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
    • 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
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The application provides a high-fatigue-performance steel for a bimetal saw blade backing material and a production method thereof. Wherein, the high fatigue property bi-metal saw blade backing steel comprises the following components in percentage by mass: 0.30 to 0.35 percent of C, 3.00 to 3.25 percent of Cr, 0.25 to 1.00 percent of Ni, 1.80 to 2.25 percent of Mo, 0.30 to 0.50 percent of Si, 0.60 to 1.00 percent of Mn and 0.30 to 0.50 percent of V; the balance of Fe and unavoidable impurities. The element components and the content thereof in the steel for the bi-metal saw blade backing material are adjusted, so that the steel is ensured to have higher plastic toughness by adopting the medium-low carbon content; meanwhile, the high contents of Cr and Mo are adopted, wherein Mo can improve the strength and tempering stability of steel, carbide precipitated in the tempering process of Cr plays a role in pinning grain boundaries and subgrain boundaries, the strength of steel is effectively improved, and the carbide and other chemical components are mutually cooperated to jointly act to manufacture the steel for the bimetal saw blade backing material with excellent fatigue performance.

Description

High-fatigue-performance steel for bimetal saw blade backing material and production method thereof
Technical Field
The application relates to the technical field of steel preparation, in particular to a high-fatigue-performance steel for a bimetal saw blade backing material and a production method thereof.
Background
The band saw blade is a common cutting tool, and is known as a craftsman's hand due to the advantages of excellent red and hard cutting performance, good cutting quality, high precision and the like. Currently, the bi-metal band saw blade is most widely used among all types of band saw blades, and thus, development and research of back materials have been an important approach to improve the overall performance of the bi-metal band saw blade. The backing materials of the bimetallic band saw blade are generally spring steel and high-strength steel with high strength, excellent toughness and good fatigue resistance.
The variety and specification of the steel suitable for the back material of the bimetallic band saw blade are less at present, on the other hand, the final heat treatment of the back material of the bimetallic band saw blade requires high-temperature quenching and three times of high-temperature tempering, the process easily causes coarsening of the structure, the fatigue resistance of the back material steel is poor, and the failure mechanism of the existing bimetallic band saw blade is mostly early fatigue fracture of the back material. Therefore, developing a backing steel with high fatigue performance and a production method thereof is a key technical problem to be solved urgently in the domestic sawing industry.
Disclosure of Invention
The embodiment of the application provides a high-fatigue-performance steel for a bimetal saw blade backing material and a production method thereof, and aims to improve the fatigue performance of the steel.
In a first aspect, an embodiment of the present application provides a steel for a high fatigue performance bi-metal saw blade backing, including the following components in percentage by mass: 0.30 to 0.35 percent of C, 3.00 to 3.25 percent of Cr, 0.25 to 1.00 percent of Ni, 1.80 to 2.25 percent of Mo, 0.30 to 0.50 percent of Si, 0.60 to 1.00 percent of Mn and 0.30 to 0.50 percent of V; the balance of Fe and unavoidable impurities.
According to an embodiment of the first aspect of the application, the mass percentage of Cr is 3.05-3.20%.
According to an embodiment of the first aspect of the application, the mass percentage of Mo is 1.85-2.10%.
According to the embodiment of the first aspect of the application, the yield strength of the steel for the high-fatigue-performance bimetal saw blade backing material is 1100-1250 MPa, the tensile strength is 1500-1650 MPa, the elongation is 12-15%, and the torsional fatigue times are more than or equal to 6250 times.
In a second aspect, an embodiment of the present application provides a method for producing a steel for a back material of a bimetal saw blade with high fatigue performance, including the steps of:
continuously casting to obtain a casting blank, wherein the casting blank comprises the following components in percentage by mass: 0.30 to 0.35 percent of C, 3.00 to 3.25 percent of Cr, 0.25 to 1.00 percent of Ni, 1.80 to 2.25 percent of Mo, 0.30 to 0.50 percent of Si, 0.60 to 1.00 percent of Mn and 0.30 to 0.50 percent of V; the balance of Fe and unavoidable impurities;
and heating the casting blank by a heating furnace, rough rolling, hot rolling, finish rolling, laminar cooling, coiling and slow cooling to obtain the high-fatigue-performance steel for the bimetal saw blade backing material.
According to an embodiment of the second aspect of the present application, the furnace heating process includes: the temperature of the casting blank entering the heating furnace is above 400 ℃, and the casting blank is heated to above 1200 ℃ in the heating furnace.
According to an embodiment of the second aspect of the present application, the finish rolling process includes: the initial rolling temperature of the hot rolling is controlled to 860-940 ℃, and the final rolling temperature of the hot rolling is controlled to 890-920 ℃.
According to an embodiment of the second aspect of the present application, the temperature of the winding process is controlled to 650-750 ℃.
According to an embodiment of the second aspect of the present application, in the step of continuous casting to obtain a cast slab, the degree of superheat is 15 to 35 ℃, and the drawing speed is 0.6 to 1.5m/min.
Compared with the prior art, the invention has at least the following beneficial effects:
the element components and the content thereof in the steel for the bimetal saw blade backing material are adjusted, so that C, cr, mo and other chemical components are mutually cooperated and jointly act, and the steel for the bimetal saw blade backing material with excellent fatigue performance is manufactured.
The components of the steel have medium and low carbon content, so that the steel has higher plastic toughness; meanwhile, the high content of Cr and Mo elements is adopted, wherein Mo can improve the strength and tempering stability of steel, can exist in solid solution and carbide in the steel, particularly in alloy carbide, and plays a role in solid solution strengthening, so that the strength of the steel is improved, and in the tempering process at a high temperature, special carbide which is dispersed and distributed is formed in a structure, and has a secondary hardening effect, so that the ductility, toughness and wear resistance of the steel are improved; cr element has stronger affinity with carbon and can be separated out (Fe, cr) in the tempering process 23 C 6 、Cr 23 C 6 And the carbide plays a role in pinning grain boundaries and subgrain boundaries, so that the strength of the steel is effectively improved, and meanwhile, cr can improve the tempering stability of the steel.
Drawings
Features, advantages, and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.
FIG. 1 is a microstructure of a high fatigue performance bi-metal saw blade backing steel of example 1 of the present application;
fig. 2 is a microstructure of a high fatigue performance bi-metal saw blade backing steel of example 2 of the present application.
Detailed Description
Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the present application and are not intended to limit the scope of the application, i.e., the application is not limited to the embodiments described.
In the description of the present application, it is to be noted that, unless otherwise indicated, the meaning of "plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like indicate an orientation or positional relationship merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "vertical" does not require a strict sense of vertical, but may include an allowable error. "parallel" does not require parallelism in a strict sense, but may include an allowable error.
At present, the steel grade for the back material of the bimetal band saw blade is less developed in China, so that the domestic high-end band saw blade market is monopoly by foreign brands, and the back material of the conventional bimetal band saw blade is generally obtained by adopting Cr-Ni-Mo-V alloy tool steel through a complex processing process. The research and development of the backing steel with excellent performance has great significance for improving the technical level and market competitiveness of the whole industry in China.
In view of this, the inventors of the present application have made a lot of experiments to provide a high fatigue performance dual metal saw blade backing steel and a method for producing the same, aiming at improving the fatigue performance thereof.
High fatigue performance steel for bimetal saw blade backing material
In a first aspect, an embodiment of the present application provides a steel for a high fatigue performance bi-metal saw blade backing, including the following components in percentage by mass: 0.30 to 0.35 percent of C, 3.00 to 3.25 percent of Cr, 0.25 to 1.00 percent of Ni, 1.80 to 2.25 percent of Mo, 0.30 to 0.50 percent of Si, 0.60 to 1.00 percent of Mn and 0.30 to 0.50 percent of V; the balance of Fe and unavoidable impurities.
The components of the steel have medium and low carbon content, so that the steel has higher plastic toughness; meanwhile, the high content of Cr and Mo elements is adopted, wherein Mo can improve the strength and tempering stability of steel, can exist in solid solution and carbide in the steel, particularly in alloy carbide, and plays a role in solid solution strengthening, so that the strength of the steel is improved, and in the tempering process at a high temperature, special carbide which is dispersed and distributed is formed in a structure, and has a secondary hardening effect, so that the ductility, toughness and wear resistance of the steel are improved; cr element has stronger affinity with carbon and can be separated out (Fe, cr) in the tempering process 23 C 6 、Cr 23 C 6 And the carbide plays a role in pinning grain boundaries and subgrain boundaries, so that the strength of the steel is effectively improved, and meanwhile, cr can improve the tempering stability of the steel.
Next, the actions of the chemical components of the high fatigue property bi-metal saw blade backing steel will be described in detail:
c: the carbon is a basic element in the steel, is an austenite forming element and is also a strengthening element of martensite and ferrite, the increase of the carbon content obviously improves the strength and the hardness of the steel, and reduces the plasticity and toughness; the carbon in the alloy steel can form M with alloying elements Cr, mo, V and the like in the steel 23 C 6 、M 6 C、M 2 C, if the carbide is distributed in a fine dispersion form, the grain is refined and precipitation strengthening is generated, so that the strength and toughness of the material can be improved.
The C content is controlled in a medium-low carbon range, so that the plasticity and toughness of the steel are ensured, and the carbon quantity of Cr, mo and V carbides is enough, so that the fatigue performance is improved. Illustratively, the mass percent content of element C is 0.30%, 0.31%, 0.32%, 0.33%, or 0.34%.
Cr: obviously improves the hardenability of steel and the tempering stability of steel, and ensures the high-temperature tempering heat treatment process performance of the back material of the bimetallic band saw blade; cr can greatly improve the ductile-brittle transition temperature of steel, improve the wear resistance of the steel, and is combined with carbon to separate out (Fe, cr) in the tempering process 23 C 6 、Cr 23 C 6 And the carbide plays a role in pinning grain boundaries.
The Cr content is controlled in a higher range, so that the tempering stability of steel is ensured, the ductile-brittle transition temperature is high, and the brittle fracture resistance of the bimetallic band saw blade is improved. Illustratively, the Cr element is 3.00%, 3.02%, 3.04%, 3.06%, 3.08%, 3.10%, 3.12%, 3.14%, 3.16%, 3.18%, 3.20%, 3.22%, or 3.25% by mass.
Ni: nickel and iron can be infinitely dissolved, ferrite is strengthened, pearlite is refined, and toughness of steel can be obviously improved; ni improves the fatigue performance of steel, reduces the sensitivity of the steel to gaps, and can obtain the comprehensive mechanical properties of good strength and toughness after heat treatment when being used together with Cr and Mo to form nickel-chromium or nickel-chromium-molybdenum steel.
The steel of the application is added with a certain amount of Ni, which is beneficial to the comprehensive performance. Illustratively, the Ni element is 0.25%, 0.30%, 0.35%, 0.40%, 0.45%, 0.50%, 0.55%, 0.60%, 0.65%, 0.70%, 0.75%, 0.80%, 0.85%, 0.90%, 0.95%, or 1.00% by mass.
Mo: the most obvious effect of molybdenum is to improve the tempering stability of steel, and when the molybdenum coexists with chromium, manganese and the like, the molybdenum inhibits tempering brittleness caused by other elements; in addition, mo has solid solution strengthening effect on ferrite, and meanwhile, the stability of carbide is improved, so that the strength of steel is improved; molybdenum has a beneficial effect on improving the ductility, toughness and wear resistance of the steel.
The content of Mo in the steel for the bi-metal saw blade back material is improved to a certain range, and the steel is easy to form an overheated structure aiming at the high-quenching and high-return heat treatment of the bi-metal saw blade, particularly the tempering temperature is just under the condition of high-temperature tempering brittleness, so that the effect of inhibiting tempering brittleness of Mo is extremely important in the steel for the bi-metal saw blade back material. Illustratively, the Mo element is 1.80%, 1.82%, 1.85%, 1.88%, 1.90%, 1.95%, 2.00%, 2.05%, 2.10%, 2.15%, 2.20%, or 2.25% by mass.
Mn: manganese is dissolved in ferrite and austenite, has obvious solid solution strengthening effect and improves hardenability, can form MnS with higher melting point with sulfur in steel, and is beneficial to eliminating hot brittleness of steel, but Mn easily causes grain growth and tempering brittleness when the steel is overheated.
The steel of the invention controls the Mn content in a lower range, mainly takes deoxidization residues in the steelmaking process, mainly considers that Mn is easy to cause overheating of the steel, and simultaneously adds trace amount of V capable of refining grains so as to counter-impact the negative effect of Mn. Illustratively, the mass percent of Mn element is 0.60%, 0.65%, 0.70%, 0.75%, 0.80%, 0.85%, 0.90%, 0.95%, or 1.00%.
V: the vanadium and the carbon can form stable refractory carbide, so that the steel still maintains a fine grain structure at a higher temperature, the overheat sensitivity of the steel is greatly reduced, and the dispersed VC carbide can improve the hardness and the wear resistance of the tool steel.
The steel of the invention is added with a small amount of V for micro-alloying, and has positive effects on improving the fatigue performance of the bimetallic band saw blade, such as fine grain structure, reduced overheat sensitivity of the steel and the like. Illustratively, the V element is 0.30%, 0.32%, 0.34%, 0.36%, 0.38%, 0.40%, 0.42%, 0.44%, 0.46%, 0.48%, or 0.50% by mass.
In conclusion, the application is through adjusting element component and content in the steel for the bi-metal saw blade backing, each chemical component mutually cooperates, the combined action makes the steel for the bi-metal saw blade backing that has excellent fatigue property, and the steel for the bi-metal saw blade backing that this application provided can be used for saw cutting steel manufacturing field.
Production method of steel for high-fatigue-performance bimetal saw blade backing material
In a second aspect, an embodiment of the present application provides a method for producing a steel for a back material of a bimetal saw blade with high fatigue performance, including: carrying out continuous casting treatment on the molten steel to obtain a casting blank; the casting blank comprises the following components in percentage by mass: 0.30 to 0.35 percent of C, 3.00 to 3.25 percent of Cr, 0.25 to 1.00 percent of Ni, 1.80 to 2.25 percent of Mo, 0.30 to 0.50 percent of Si, 0.60 to 1.00 percent of Mn and 0.30 to 0.50 percent of V; the balance of Fe and unavoidable impurities;
and heating the casting blank by a heating furnace, rough rolling, hot rolling, finish rolling, laminar cooling, coiling and slow cooling to obtain the high-fatigue-performance steel for the bimetal saw blade backing material.
The production process of the back steel of the bimetallic band saw blade mainly comprises the following steps:
converter smelting, ladle furnace, vacuum furnace, slab continuous casting, heating by a heating furnace, rough rolling, hot rolling box, finish rolling, laminar cooling, coiling and slow cooling.
Smelting in a converter: molten iron, scrap steel, ferronickel and ferromolybdenum are put into a converter, smelting is carried out by adopting a top-bottom combined blown converter, the smelting time is 30-50 min, the tapping temperature is 1600-1700 ℃, the mass percent of carbon at the end point is controlled to be 0.04-0.10%, ferrosilicon, ferromanganese and ferroaluminum are added for deoxidization when molten steel is tapped, ferrochromium is added for alloying, and lime is added for slag making; adding carbon powder for carburetion;
refining in a ladle furnace: adding lime for slagging, adding ferromanganese alloy, ferrosilicon alloy, ferrochromium alloy, ferromolybdenum alloy, ferronickel alloy and aluminum particles into an LF refining furnace, adding lime into the LF refining furnace, pre-slag for slagging and desulfurization, adding ferrovanadium alloy, and adjusting the temperature to 1570-1620 ℃ and discharging;
refining in a vacuum furnace: treating in RH or VD vacuum furnace for 10-20 min, dehydrogenating and eliminating inclusion, raising pressure to 10-40 KPa, blowing nitrogen to alloy molten steel, and controlling nitrogen content to over 0.02%;
continuous slab casting: casting by adopting a slab caster, wherein the superheat degree is controlled to be 15-35 ℃, and the pulling speed is 0.6-1.5 m/min;
heating by a heating furnace: the continuous casting slab adopts a hot charging and hot feeding process, so that the charging temperature of the slab when entering a heating furnace is ensured to be more than 400 ℃, and the heating temperature of the slab is ensured to be more than 1200 ℃;
the temperature range can ensure the homogenization of the phase structure in the casting blank, is favorable for fine crystallization, and can eliminate the component segregation generated in the solidification process of the casting blank to a certain extent.
Rough rolling and hot rolling box: after rough rolling, the intermediate blank is put into a hot rolling box for rolling;
finish rolling: the final rolling temperature of the hot rolling is controlled to 860-940 ℃, and the final rolling temperature of the hot rolling is controlled to 890-920 ℃.
The finishing temperature of the finish rolling is controlled within the range, and the finishing temperature of the finish rolling is higher than 920 ℃ which is unfavorable for the formation of M by elements such as Cr, mo, V and the like 23 C 6 、M 6 C、M 2 The C is finely dispersed and separated out, and the crystal grains are easy to grow. The hot rolling is performed in the above temperature range, and a final product satisfying excellent performance quality requirements can be obtained.
Laminar cooling: sparse cooling is adopted for layer cooling after rolling;
and (3) coiling: the coiling temperature is controlled between 650 and 750 ℃;
in the application, the coiling temperature is controlled to be 650-750 ℃, and the dispersion distribution of the phase precipitation particles at the coiling temperature can provide better precipitation strengthening effect and ensure the yield strength of the steel. The coiling temperature is too high, the ferrite grain ratio is increased, and the tensile strength is difficult to ensure. The coiling temperature is too low, so that the coiling difficulty is easy to cause, and the steel plate has larger internal stress, thereby being unfavorable for improving the impact toughness.
Slowly cooling: and (5) rapidly taking off the coil after rolling, and slowly cooling the coil in a slow cooling pit or a slow cooling cover.
Through the slow cooling mode, the internal stress of the casting blank is reduced, the center segregation and center porosity of the casting blank are relieved, and the plasticity and toughness are improved.
Examples
The following examples more particularly describe the disclosure of the present application, which are intended as illustrative only, since numerous modifications and variations within the scope of the disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages, and ratios reported in the examples below are by weight, and all reagents used in the examples are commercially available or were obtained synthetically according to conventional methods and can be used directly without further treatment, as well as the instruments used in the examples.
Example 1:
190 tons of molten iron, 20 tons of scrap steel, 1.35 tons of ferronickel and 7.8 tons of ferromolybdenum are charged into a 210 ton converter, and smelting is carried out by adopting an N-type combined blown converter 2 And (3) carrying out bottom blowing, smelting for 35min, tapping, wherein the carbon content of the terminal point is 0.07%, the tapping temperature is 1622 ℃, and 6.1 tons of ferrochrome and 380Kg of carbon powder are added during tapping.
The molten steel is refined in a ladle furnace through an LF refining furnace, lime is added for slagging, ferromanganese, ferrosilicon, ferrochromium, ferromolybdenum, ferronickel and aluminum particles are added into the LF refining furnace, lime and premelting slag are added into the LF refining furnace for slagging and desulfurization, and the mass percentage of C, si, mn, ni, cr, mo, al elements are respectively adjusted to target values: c:0.32%, si:0.35%, mn:0.68%, cr:3.2%, ni:0.3%, mo:2.0 percent, after the content of each element is adjusted in place, adding ferrovanadium alloy, adjusting the content of V to be 0.35 percent of the target content, and discharging at 1581 ℃.
And (3) carrying out ultimate vacuum treatment of 67Pa for 15min and nitrogen blowing treatment for 22min in an RH refining furnace, and controlling the nitrogen increase of the molten steel to 0.025%.
Casting the molten steel into a casting blank by a continuous casting machine, wherein the casting blank comprises the following chemical components in percentage by weight: c:0.31%, si:0.33%, mn:0.64%, cr:3.13%, V:0.34%, ni:0.28%, mo:1.85% of Fe and the balance of unavoidable impurities.
The thickness of a casting blank is 230mm, a steel coil with the specification of 3.0mm multiplied by 1250mm is rolled in a 2250mm conventional hot continuous rolling production line, the heating temperature is 1240 ℃, the thickness of an intermediate blank is 40mm, the final rolling temperature is 900 ℃, the steel coil is cooled to the target coiling temperature of 720 ℃ by laminar flow after rolling, and the steel coil is hung into a slow cooling cover for cooling after coiling.
The steel for the high-fatigue-performance bi-metal band saw blade backing material produced by the production method has the thickness fluctuation of strip steel less than or equal to +/-0.06 mm, convexity less than or equal to 40 mu m and hardness difference in the same coil less than or equal to 6.0HRC.
Example 2:
189 tons of molten iron, 21 tons of scrap steel, 1.35 tons of ferronickel and 7.8 tons of ferromolybdenum are charged into a 210 ton converter, the converter is used for smelting, the steel is tapped after 32 minutes, the carbon content at the end point is 0.05%, and the tapping temperature is 1621 ℃. 6.1 tons of low-carbon ferrochrome and 380Kg of carbon powder are added during tapping.
The molten steel is refined in a ladle furnace through an LF refining furnace, lime is added for slagging, ferromanganese, ferrosilicon, ferrochromium, ferromolybdenum, ferronickel and aluminum particles are added into the LF refining furnace, lime and premelting slag are added into the LF refining furnace for slagging and desulfurization, and the mass percentage of C, si, mn, ni, cr, mo, al elements are respectively adjusted to target values: c:0.32%, si:0.35%, mn:0.68%, cr:3.2%, ni:0.3%, mo:2.0 percent, after the content of each alloy is adjusted in place, adding ferrovanadium alloy to adjust the V content to be 0.35 percent of the target content, and discharging at 1569 ℃.
The molten steel is treated in RH refining furnace in 67Pa limiting vacuum for 15min and blown with nitrogen for 25min under 280KPa to raise nitrogen content in the molten steel to 0.031%.
Molten steel is poured into a casting blank by a continuous casting machine, and the casting blank comprises the following chemical components in percentage by mass: c:0.30%, si:0.35%, mn:0.65%, cr:3.09%, V:0.36%, ni:0.32%, mo:2.02% of Fe and the balance of unavoidable impurities.
The thickness of a casting blank is 230mm, a steel coil with the specification of 4.0mm multiplied by 1250mm is rolled in a 2250mm conventional hot continuous rolling production line, the heating temperature is 1250 ℃, the thickness of an intermediate blank is 38mm, the final rolling temperature is 900 ℃, the steel coil is cooled to the target coiling temperature of 700 ℃ by laminar flow after rolling, and the steel coil is hung into a slow cooling cover for cooling after coiling.
The thickness fluctuation of the strip steel is less than or equal to +/-0.06 mm, the convexity is less than or equal to 40 mu m, and the hardness difference of the same coil is less than or equal to 5.0HRC.
Example 3
A high fatigue performance bi-metal saw blade backing steel, similar to the preparation process of example 1, except that the mass percentage of C, si, mn, ni, cr, mo, al element was adjusted to the target value: c:0.32%, si:0.35%, mn:0.68%, cr:3.2%, ni:0.3%, mo:2.0 percent, after the content of each alloy is adjusted in place, adding ferrovanadium alloy to adjust the V content to be 0.35 percent of the target content, and discharging at 1569 ℃.
The casting blank comprises the following chemical components in percentage by mass: c:0.31%, si:0.32%, mn:0.65%, cr:3.09%, V:0.36%, ni:0.32%, mo:2.02% of Fe and the balance of unavoidable impurities.
Example 4
A high fatigue performance bi-metal saw blade backing steel, similar to the preparation process of example 1, except that the mass percentage of C, si, mn, ni, cr, mo, al element was adjusted to the target value: c:0.32%, si:0.35%, mn:0.68%, cr:3.2%, ni:0.3%, mo:2.0 percent, after the content of each alloy is adjusted in place, adding ferrovanadium alloy to adjust the V content to be 0.35 percent of the target content, and discharging at 1569 ℃.
The casting blank comprises the following chemical components in percentage by mass: c:0.31%, si:0.32%, mn:0.65%, cr:3.09%, V:0.36%, ni:0.32%, mo:2.02% of Fe and the balance of unavoidable impurities.
Comparative example 1
A steel material similar to the preparation process of example 1, except that the mass percentage of C, si, mn, ni, cr, mo, al element was adjusted to a target value, respectively: c:0.32%, si:0.35%, mn:0.68%, cr:3.4%, ni:0.3%, mo:2.0 percent, after the content of each alloy is adjusted in place, adding ferrovanadium alloy to adjust the V content to be 0.35 percent of the target content, and discharging at 1569 ℃.
The casting blank comprises the following chemical components in percentage by mass: c:0.31%, si:0.32%, mn:0.65%, cr:3.35%, V:0.36%, ni:0.32%, mo:2.02% of Fe and the balance of unavoidable impurities.
Comparative example 2
A steel material similar to the preparation process of example 1, except that the mass percentage of C, si, mn, ni, cr, mo, al element was adjusted to a target value, respectively: c:0.32%, si:0.35%, mn:0.68%, cr:3.2%, ni:0.3%, mo:1.8 percent, after the content of each alloy is adjusted in place, adding ferrovanadium alloy to adjust the V content to be 0.35 percent of the target content, and exiting at 1569 ℃.
The casting blank comprises the following chemical components in percentage by mass: c:0.31%, si:0.32%, mn:0.65%, cr:3.09%, V:0.36%, ni:0.32%, mo:1.68% of Fe and the balance of unavoidable impurities.
Comparative example 3
A steel material was prepared similarly to example 1 except that the coiling temperature was adjusted to 800 ℃.
Comparative example 4
A steel material was prepared in a similar manner to example 1, except that the rolling was performed by heating to 1150 ℃.
The high fatigue property dual metal saw blade backing steels obtained in examples 1 to 4 and the products of comparative examples 1 to 4 were subjected to the process of GB/T228.1-2010; the detection method of torsional fatigue life comprises the following steps: according to the test method of the torsion fatigue testing machine for the internal self-grinding of enterprises, setting the fatigue stress to be 380Mpa and the frequency to be 1Hz, and detecting the products prepared by the examples and the comparative examples; the results are shown in Table 1.
TABLE 1 mechanical Properties and tissue detection conditions list for examples 1-4 and comparative examples 1-4
As can be seen from Table 1, the high fatigue performance bimetallic saw blade backing steels of examples 1-4 have high strength, while giving good toughness, especially excellent fatigue resistance. The chemical component proportion and the preparation process provided by the application are combined, so that the obtained high-fatigue-performance bimetal saw blade backing steel has good mechanical properties and high fatigue performance.
Referring to fig. 1, the microstructure of the steel for the back material of the bi-metal band saw blade produced by the production method is a tempered sorbite structure, carbide is distributed in a fine dispersion mode, and precipitation strengthening is generated while grains are refined, so that the strength and toughness of the material can be improved.
Referring to fig. 2, the microstructure of the steel for the back material of the bi-metal band saw blade produced by the production method is a tempered sorbite structure, carbide is distributed in a fine dispersion mode, and precipitation strengthening is generated while grains are refined, so that the strength and toughness of the material can be improved.
Comparative example 1, cr element content exceeds the range, resulting in higher steel strength and hardness, lower plasticity and fatigue performance, comparative example 2, mo element content exceeds the range, resulting in greatly improved cost, comparative example 3, too high coiling temperature, resulting in coarser grains of raw materials, further inherited to finished products, reduced plasticity and toughness, comparative example 4, lower heating temperature, resulting in coarser carbides of steel types, obvious segregation, and further greatly reduced plasticity and toughness.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (9)

1. The steel for the bimetal saw blade backing material with high fatigue performance is characterized by comprising the following components in percentage by mass: 0.30 to 0.35 percent of C, 3.00 to 3.25 percent of Cr, 0.25 to 1.00 percent of Ni, 1.80 to 2.25 percent of Mo, 0.30 to 0.50 percent of Si, 0.60 to 1.00 percent of Mn and 0.30 to 0.50 percent of V; the balance of Fe and unavoidable impurities.
2. The steel for a high fatigue property bi-metal saw blade backing according to claim 1, wherein the mass percentage of Cr is 3.05-3.20%.
3. The steel for a high fatigue property bi-metal saw blade backing according to claim 1, wherein the mass percentage of Mo is 1.85 to 2.10%.
4. The steel for a high fatigue property bi-metal saw blade backing material according to claim 1, wherein the yield strength of the steel for a high fatigue property bi-metal saw blade backing material is 1100 MPa-1250 MPa, the tensile strength is 1500 MPa-1650 MPa, the elongation is 12% -15%, and the number of torsional fatigue times is equal to or more than 6250 times.
5. The production method of the steel for the bimetal saw blade backing material with high fatigue performance is characterized by comprising the following steps of:
continuously casting to obtain a casting blank, wherein the casting blank comprises the following components in percentage by mass: 0.30 to 0.35 percent of C, 3.00 to 3.25 percent of Cr, 0.25 to 1.00 percent of Ni, 1.80 to 2.25 percent of Mo, 0.30 to 0.50 percent of Si, 0.60 to 1.00 percent of Mn and 0.30 to 0.50 percent of V; the balance of Fe and unavoidable impurities;
and heating the casting blank by a heating furnace, rough rolling, hot rolling, finish rolling, laminar cooling, coiling and slow cooling to obtain the steel for the bimetal saw blade backing material with high fatigue performance.
6. The method for producing a steel for a high fatigue property bi-metal saw blade backing according to claim 5, wherein the heating treatment in the heating furnace comprises: the temperature of the casting blank entering the heating furnace is more than 400 ℃, and the casting blank is heated to more than 1200 ℃ in the heating furnace.
7. The method for producing a steel for a high fatigue property bi-metal saw blade backing according to claim 5, wherein the finish rolling treatment comprises: the initial rolling temperature of the hot rolling is controlled to 860-940 ℃, and the final rolling temperature of the hot rolling is controlled to 890-920 ℃.
8. The method for producing a steel for a high fatigue property bi-metal saw blade backing according to claim 5, wherein the temperature of the coiling treatment is controlled to 650-750 ℃.
9. The method for producing a steel for a high fatigue property bi-metal saw blade backing according to claim 5, wherein in the step of continuous casting to obtain a cast slab, the degree of superheat is 15 to 35 ℃ and the drawing rate is 0.6 to 1.5m/min.
CN202311449356.9A 2023-11-02 2023-11-02 High-fatigue-performance steel for bimetal saw blade backing material and production method thereof Pending CN117568710A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5032356A (en) * 1988-10-21 1991-07-16 Hitachi Metals, Ltd. High fatigue strength metal band saw backing material
DE69010487D1 (en) * 1990-04-18 1994-08-11 Hitachi Metals Ltd Material with high fatigue strength for support bands for saw blades.
US20030152477A1 (en) * 2002-02-09 2003-08-14 Oskar Pacher Bimetal saw band
CN109468527A (en) * 2018-10-08 2019-03-15 湖南华菱涟源钢铁有限公司 Steel for back material of bimetal band saw blade and manufacturing method thereof
CN114351060A (en) * 2022-01-14 2022-04-15 山西太钢不锈钢股份有限公司 Hot-rolled steel strip, preparation method thereof and application thereof in bimetal band saw backing material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5032356A (en) * 1988-10-21 1991-07-16 Hitachi Metals, Ltd. High fatigue strength metal band saw backing material
DE69010487D1 (en) * 1990-04-18 1994-08-11 Hitachi Metals Ltd Material with high fatigue strength for support bands for saw blades.
US20030152477A1 (en) * 2002-02-09 2003-08-14 Oskar Pacher Bimetal saw band
CN109468527A (en) * 2018-10-08 2019-03-15 湖南华菱涟源钢铁有限公司 Steel for back material of bimetal band saw blade and manufacturing method thereof
CN114351060A (en) * 2022-01-14 2022-04-15 山西太钢不锈钢股份有限公司 Hot-rolled steel strip, preparation method thereof and application thereof in bimetal band saw backing material

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