CN116024490A - Medium-carbon pre-hardened saw blade steel and manufacturing method thereof - Google Patents
Medium-carbon pre-hardened saw blade steel and manufacturing method thereof Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 229910000859 α-Fe Inorganic materials 0.000 claims description 11
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- 230000000717 retained effect Effects 0.000 claims description 8
- 229910003460 diamond Inorganic materials 0.000 abstract description 11
- 239000010432 diamond Substances 0.000 abstract description 11
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Abstract
The invention discloses a medium carbon pre-hardening saw blade steel, which contains Fe and unavoidable impurities and also contains the following chemical elements in percentage by mass: c:0.46 to 0.60 percent, si:0.10 to 0.80 percent, mn:0.50 to 2.50 percent, B:0.0010 to 0.0050 percent, al: 0.010-0.070%, ti: 0.005-0.080%, ca:0.0010 to 0.0060% and Nb: 0.005-0.050%, cr:0.01 to 0.50 percent of Mo:0.01 to 0.80 percent of Ni:0.01 to 1.00 percent of RE:0.01 to 0.10 percent of Cu:0.10 to 0.40%. In addition, the invention also discloses a manufacturing method of the medium carbon pre-hardening saw blade steel, which comprises the following steps: (1) smelting and casting; (2) heating; (3) rolling; (4) on-line quenching. The medium carbon pre-hardening saw blade steel has excellent comprehensive performance, high strength and hardness, good toughness, excellent machinability and thermal stability, and is suitable for preparing products such as diamond saw blades.
Description
Technical Field
The invention relates to steel and a manufacturing method thereof, in particular to steel for a saw blade matrix and a manufacturing method thereof.
Background
As is well known, in the stone processing field, the application range of steel for diamond circular saw blades is very wide, and an operator often needs to cut a cutting object such as granite, marble, etc. by using a saw blade made of steel for diamond circular saw blades.
When cutting is performed by using a diamond saw blade, the diamond saw blade rotates at a high speed to cut stone, and in general, the linear speed of cutting granite may be controlled to be 25 to 40m/s and the linear speed of cutting marble may be controlled to be 45 to 60m/s.
However, it should be noted that, since the diamond saw blade has a certain vibration frequency in the cutting process, the vibration frequency is increased in the cutting process, and a resonance phenomenon is generated; therefore, in order to ensure the safety of the cutting process, it is required that the saw blade has a high elastic limit and a high yield ratio.
Secondly, the saw blade should have high rigidity and fatigue strength because the saw blade may be repeatedly bent due to the unevenness of the saw blade or poor installation of the saw blade, which may cause the reduction of the rigidity of the saw blade and the fatigue damage.
In addition, during the cutting process, the saw blade also bears the centrifugal force generated by high-speed rotation, the water tank part bears the cyclic cutting pressure and impact force, and the saw blade also has certain toughness.
Therefore, in the prior art, the saw blade has to be subjected to quenching treatment in oil and tempering treatment for 12-14 hours, so that the quenching and tempering heat treatment process has obvious technical disadvantages, such as complex production process, long period, high energy consumption and the like, and also has the possibility of environmental pollution caused by oil quenching.
Based on the defects and shortcomings in the prior art, in order to meet the requirements on the performance of the saw blade in the actual use process, the invention expects to obtain a new medium carbon pre-hardening saw blade steel, which can ensure that the manufactured saw blade steel has the advantages of high strength and hardness, good toughness, uniform hardness, excellent machinability and thermal stability and easy welding through reasonable chemical composition design and matching with an optimization process; the saw blade steel not only has excellent performance, but also has lower production cost, is friendly to the environment, can be effectively applied to the production and the preparation of ultra-wide diamond saw blades, and has very good popularization prospect and application value.
Disclosure of Invention
The invention aims to provide the medium-carbon pre-hardening saw blade steel, which has excellent mechanical properties, can control lower production cost, has Brinell hardness of more than 400HB and Charpy V-shaped longitudinal impact energy of more than 50J, is environment-friendly, can be effectively applied to the production and preparation of ultra-wide diamond saw blades, and has very good popularization prospect and application value.
In order to achieve the above object, the present invention provides a medium carbon pre-hardened saw blade steel, which contains Fe and unavoidable impurities, and further contains the following chemical elements in mass percent:
c:0.46 to 0.60 percent, si:0.10 to 0.80 percent, mn:0.50 to 2.50 percent, B:0.0010 to 0.0050 percent, al: 0.010-0.070%, ti: 0.005-0.080%, ca:0.0010 to 0.0060% and Nb: 0.005-0.050%, cr:0.01 to 0.50 percent of Mo:0.01 to 0.80 percent of Ni:0.01 to 1.00 percent of RE:0.01 to 0.10 percent of Cu:0.10 to 0.40%.
Further, in the medium carbon pre-hardening saw blade steel, the mass percentages of the chemical elements are as follows:
c:0.46 to 0.60 percent, si:0.10 to 0.80 percent, mn:0.50 to 2.50 percent, B:0.0010 to 0.0050 percent, al: 0.010-0.070%, ti: 0.005-0.080%, ca:0.0010 to 0.0060% and Nb: 0.005-0.050%, cr:0.01 to 0.50 percent of Mo:0.01 to 0.80 percent of Ni:0.01 to 1.00 percent of RE:0.01 to 0.10 percent of Cu:0.10 to 0.40% of at least one of the following components; the balance being Fe and unavoidable impurities.
In the technical scheme, the invention adopts reasonable chemical component design, has simple and reasonable component design, mainly takes medium and high carbon, manganese and boron as main additive elements, and can effectively reduce the production and manufacturing cost.
In the chemical composition design of the medium carbon pre-hardening saw blade steel, the alloy composition of the saw blade steel is mainly low alloy, the characteristics of refinement, reinforcement and the like of micro-alloy elements such as Nb, ti and the like are fully utilized, and the wide saw blade steel plate can be ensured to have good mechanical properties and excellent welding properties while reducing carbon, alloy elements such as Cr, mo, ni and the like.
In the medium carbon pre-hardening saw blade steel, the design principle of each chemical element is as follows:
c: in the medium carbon pre-hardening saw blade steel, C is the most basic and important element in the saw blade steel, and the strength and hardness of the steel can be improved by adding a proper amount of C element, so that the wear resistance of the steel is improved. However, it should be noted that the element C has an adverse effect on the toughness and weldability of the steel, and therefore, the content of the element C in the steel needs to be controlled reasonably. Based on the above, in consideration of the influence of the content of C element on the performance of the saw blade steel, the mass percentage of C element in the medium carbon pre-hardening saw blade steel is controlled to be between 0.46 and 0.60 percent.
Si: in the medium carbon pre-hardened saw blade steel according to the present invention, si can be solid-dissolved in ferrite and austenite, and thus the hardness and strength thereof can be improved, however, too high a content of Si element causes a sharp decrease in toughness of the steel. Meanwhile, in consideration of the fact that the affinity of silicon and oxygen is higher than that of iron, silicate with low melting point is easy to generate during welding, the fluidity of slag and molten metal is increased, the quality of a welding seam is affected, and therefore the content of Si element in steel is not excessive. Based on the above, in the medium carbon pre-hardened saw blade steel, the mass percentage of Si element is controlled to be between 0.10 and 0.80 percent.
Mn: in the medium carbon pre-hardening saw blade steel, the addition of a proper amount of Mn element can strongly increase the hardenability of the steel, and reduce the transformation temperature of the steel and the critical cooling speed of the steel. However, it should be noted that the Mn element content in the steel is not too high, and when the Mn element content in the steel is too high, not only the crystal grains tend to be coarsened, but also the tempering brittleness sensitivity of the steel is increased, and segregation and cracks are easily caused in the cast blank, so that the performance of the steel sheet is reduced. Based on the above, in the medium carbon pre-hardened saw blade steel, the mass percentage of Mn element is controlled between 0.50 and 2.50 percent.
B: in the medium carbon pre-hardening saw blade steel, the hardenability of the steel can be improved by adding a proper amount of B element, but when the B element content in the steel is too high, the heat embrittlement phenomenon is caused, the welding performance and the hot processing performance of the steel are affected, and therefore, the B element content in the steel needs to be strictly controlled. Based on this, in the medium carbon pre-hardened saw blade steel according to the present invention, the mass percentage of the B element is controlled to be between 0.0010 and 0.0050%.
Al: in the medium carbon pre-hardening saw blade steel, al element can form tiny indissolvable AlN particles with N element in the steel, so as to refine crystal grains of the steel. The proper amount of Al element is added into the steel to effectively refine the crystal grains of the steel, fix N and O in the steel, reduce the sensitivity of the steel to gaps, reduce or eliminate the aging phenomenon of the steel and improve the toughness of the steel. Based on the above, in the medium carbon pre-hardening saw blade steel, the mass percentage of the Al element is controlled to be between 0.010 and 0.070 percent.
Ti: in the medium carbon pre-hardened saw blade steel of the invention, ti is one of the strong carbide forming elements, and the Ti element can be combined with the C element to form fine TiC particles. The TiC particles are fine and can be distributed on the grain boundary, so that the effect of refining the grains is achieved; in addition, tiC particles are harder, which can improve the wear resistance of the steel. Based on this, in consideration of the beneficial effects of the Ti element, in the medium carbon pre-hardened saw blade steel of the present invention, the mass percentage of the Ti element is controlled to be between 0.005 and 0.080%.
Ca: in the medium carbon pre-hardening saw blade steel, ca element has a remarkable effect on the deterioration of inclusions in cast steel. The addition of a proper amount of Ca in the cast steel can convert strip sulfide inclusions in the cast steel into spherical CaS or (Ca, mn) S inclusions, and oxides and sulfide inclusions formed by Ca have small densities and are easy to float upwards and remove. In addition, ca can also obviously reduce the segregation of S at the grain boundary, which is beneficial to improving the quality of cast steel and further improving the performance of the steel. Based on this, in the medium carbon pre-hardened saw blade steel of the present invention, the mass percentage of the Ca element is controlled to be between 0.0010 and 0.0060%.
Nb: in the medium carbon pre-hardening saw blade steel, the refined grains and precipitation strengthening effect of Nb are extremely remarkable in improving the toughness of the material; nb is a strong C, N forming element and can strongly inhibit austenite grain growth. Nb improves the strength and toughness of steel through grain refinement, and Nb improves and enhances the properties of steel mainly through precipitation strengthening and phase transformation strengthening, and Nb has been one of the most effective strengthening agents in high-strength low-alloy structural steel. Based on this, in the medium carbon pre-hardened saw blade steel according to the present invention, the mass percentage of Nb element may be controlled to be between 0.005 and 0.050%.
Cr: in the medium carbon pre-hardening saw blade steel, cr element can reduce critical cooling speed and improve hardenability of the steel. Cr may be formed in the steel (Fe, cr) 3 C、(Fe，Cr) 7 C 3 And (Fe, cr) 23 C 7 And various carbides, which can effectively improve the strength and hardness of the steel. In addition, the addition of a proper amount of Cr to steel can prevent or slow down the precipitation and aggregation of carbide during tempering, thereby improving the tempering stability of the steel. Based on this, considering the beneficial effect of Cr element, in the medium carbon pre-hardened saw blade steel of the invention, the mass percentage of Cr element can be controlled between 0.01 and 0.50 percent.
Mo: in the medium carbon pre-hardening saw blade steel, proper amount of Mo is added to refine grains effectively and improve the strength and toughness of the steel. Mo exists in the steel in a solid solution phase and a carbide phase, and therefore, mo-containing steel has both solid solution strengthening and carbide dispersion strengthening effects. In addition, mo is an element for reducing tempering brittleness, and proper amount of Mo element is added into steel, so that the tempering stability of the material can be improved. Based on the above, in the medium carbon pre-hardening saw blade steel, the mass percentage of Mo element is controlled to be between 0.01 and 0.80 percent.
Ni: in the medium carbon pre-hardened saw blade steel of the invention, ni and iron are mutually soluble in any proportion, can improve the low-temperature toughness of the steel by refining ferrite grains, and has the effect of obviously reducing the cold-embrittlement transition temperature. However, it should be noted that the Ni element content in the steel is not too high, and when the Ni element content in the steel is too high, it is easy to cause the surface oxide scale of the steel sheet to be difficult to fall off, and the production cost is significantly increased. Based on the above, in the medium carbon pre-hardening saw blade steel, the mass percentage of Ni element is controlled to be between 0.01 and 1.00 percent.
RE: in the medium carbon pre-hardening saw blade steel, the proper amount of rare earth is added to reduce segregation of elements such as sulfur, phosphorus and the like, improve the shape, the size and the distribution of nonmetallic inclusions, refine grains and improve the hardness. In addition, the rare earth can also improve the yield ratio, which is beneficial to improving the toughness of the low-alloy high-strength steel and can improve the thermal stability of the steel plate. However, it should be noted that the rare earth content in the steel should not be excessive, otherwise serious segregation occurs, and the quality and mechanical properties of the casting blank are reduced. Based on the above, in the medium carbon pre-hardening saw blade steel, the mass percentage of RE is controlled to be between 0.01 and 0.10 percent.
Cu: in the medium carbon pre-hardening saw blade steel, cu mainly exists in a solid solution state and a single phase precipitation state in the steel, and the solid solution Cu can play a solid solution strengthening role; since the solid solubility of Cu in ferrite decreases rapidly with decreasing temperature, cu in supersaturated solid solution can be precipitated in the form of simple substance at lower temperature, thereby playing a role of precipitation strengthening. In addition, when a proper amount of Cu is added to the steel, the atmospheric corrosion resistance of the steel can be remarkably improved, and particularly when Cu and P coexist, the effect is remarkable. Based on the above, in the medium carbon pre-hardening saw blade steel, the mass percentage of Cu element is controlled to be between 0.10 and 0.40 percent.
Further, in the medium carbon pre-hardening saw blade steel, the mass percentages of the chemical elements are as follows:
c:0.47 to 0.58 percent, si:0.15 to 0.80 percent, mn:0.50 to 2.00 percent, B:0.0010 to 0.0040 percent, al:0.010 to 0.060 percent, ti:0.005-0.070%, ca:0.0010 to 0.0050% and Nb:0.008 to 0.050 percent, cr:0.05 to 0.50 percent of Mo:0.05 to 0.70 percent of Ni: 0.10-0.90%, RE:0.01 to 0.08 percent, cu:0.10 to 0.35 percent of one or more than one of the following components; the balance being Fe and unavoidable impurities.
In the above-mentioned technical solutions of the present invention, in some preferred embodiments, in order to obtain a better implementation effect, the mass percentages of the chemical elements in the medium carbon pre-hardened saw blade steel according to the present invention may be preferably further controlled so as to control to meet the requirements of the above-mentioned preferred technical solutions.
Further, in the medium carbon pre-hardened saw blade steel according to the present invention, each chemical element thereof also satisfies at least one of the following:
C：0.48～0.58％；
Si：0.15～0.70％；
Mn：0.5～1.5％；
B：0.0010～0.0035％；
Ti：0.005～0.060％；
Al：0.015～0.055％；
Nb：0.008～0.045％；
Cr：0.05～0.45％；
Mo：0.05～0.60％；
Ni：0.1～0.8％；
RE：0.01～0.06％；
Cu：0.15～0.35％；
Ca：0.0010～0.0045％。
accordingly, in the above technical solution, in order to obtain an optimal implementation effect, it may be most preferable to control that the chemical elements in the medium carbon pre-hardened saw blade steel according to the present invention satisfy at least one of the above items.
Further, in the medium carbon pre-hardened saw blade steel of the invention, among unavoidable impurities, P is less than or equal to 0.030% and S is less than or equal to 0.010%.
Further, in the medium carbon pre-hardened saw blade steel of the present invention, among the unavoidable impurities, P is not more than 0.015% and S is not more than 0.005%.
Further, in the medium carbon pre-hardened saw blade steel of the invention, among unavoidable impurities, P is less than or equal to 0.012% and S is less than or equal to 0.003%.
In the saw blade steel of the present invention, P and S are both unavoidable impurity elements, and in order to ensure the quality of the saw blade steel, the lower the content of the impurity elements in the steel is, the better the condition is allowed.
Note that P, S are harmful elements, and their contents are strictly controlled. Therefore, in the medium carbon pre-hardened saw blade steel according to the present invention, it is possible to control the unavoidable impurity elements to satisfy: p is less than or equal to 0.030%, S is less than or equal to 0.010%.
Of course, in some preferred embodiments, in order to obtain a better implementation effect, the content of the P, S impurity element may be further controlled to satisfy: p is less than or equal to 0.015 percent, S is less than or equal to 0.005 percent. In order to ensure the quality of the saw blade steel, it is most preferable to control the content of P, S impurity elements to satisfy: p is less than or equal to 0.012 percent, S is less than or equal to 0.003 percent.
Further, in the medium carbon pre-hardened saw blade steel of the present invention, the microstructure is bainite+ferrite+retained austenite+carbide or bainite+retained austenite+carbide.
Further, in the medium carbon pre-hardened saw blade steel of the invention, the Brinell hardness is more than 400HB, and the Charpy V-shaped longitudinal impact energy is more than 50J.
Accordingly, another object of the present invention is to provide a method for manufacturing a medium carbon pre-hardened saw blade steel, which has a simple production process, low production cost and low environmental stress. The medium carbon pre-hardening saw blade steel prepared by the manufacturing method has high strength, high toughness and high machining performance, is easy to weld, has Brinell hardness of more than 400HB, has a Charpy V-shaped longitudinal impact energy of more than 50J, is particularly suitable for producing and preparing ultra-wide diamond saw blades, and has very good popularization prospect and application value.
In order to achieve the above object, the present invention provides a method for manufacturing the medium carbon pre-hardened saw blade steel, comprising the steps of:
(1) Smelting and casting;
(2) Heating;
(3) Rolling;
(4) And (3) online quenching: cooling is carried out by adopting water cooling, wherein the opening cooling temperature is as follows: (Ar 3 '-50) - (Ar 3' +50) DEG C; ms < final cooling temperature < Bs, and then air cooling to room temperature, wherein the water cooling speed is 10-40 ℃/s.
In the method for manufacturing the saw blade steel, smelting, casting, heating, rolling and on-line quenching steps are sequentially carried out on each smelting raw material according to the proportion of the chemical components, so that the medium-carbon pre-hardening saw blade steel is obtained. In the online quenching step, the microstructure is fully refined after rolling, and meanwhile, the online water cooling mode is adopted for cooling, so that an offline heat treatment process can be omitted, the production flow is shortened, the production efficiency is improved, and the production cost is reduced.
Correspondingly, in the step (4) of the invention, in order to reduce the hardenability of steel and avoid the cracking of the steel plate, when water cooling is adopted, the final cooling temperature can be controlled within a Bs-Ms temperature range, namely Ms < final cooling temperature < Bs, so that the hardenability and red hardness of the saw blade steel are ensured, and the toughness of the saw blade manufactured subsequently is ensured. In addition, the cooling temperature can be controlled below Ar3', so that the microstructure of the steel plate is ensured to contain a certain proportion of ferrite soft phase, and the toughness and fatigue resistance of the steel plate are further improved.
In the present invention, ar3' represents a temperature at which austenite starts to transform into ferrite during the in-line quenching; bs represents the temperature at which bainite starts to transform; ms is expressed as the temperature at which martensite starts to transform.
The saw blade steel has excellent mechanical performance (such as high strength and high hardness), mechanical processing performance, thermal stability and other welding performances through the refining strengthening effect of the alloy elements and the optimized control of the production process due to the scientifically designed contents of the carbon and the alloy elements.
In some preferred embodiments, in step (4), the cooling temperature may be preferably controlled to be: (Ar 3 '-40) - (Ar 3' +40) DEG C, the final cooling temperature is controlled to satisfy: (Ms+15℃) below the final cooling temperature (B) s 15 ℃ below zero) and then air-cooled to room temperature, wherein the water-cooling rate is 10-35 ℃ per second.
Of course, in certain embodiments, it is most preferable that the chilling temperature can be controlled to be: (Ar 3-40) - (Ar 3+ 30) DEG C, the final cooling temperature is controlled to satisfy the following conditions: (Ms+25℃) < final cooling temperature < (Bs-15 ℃) and then air-cooled to room temperature, wherein the water-cooling rate is 10-32 ℃/s.
In the invention, the manufacturing method of the medium carbon pre-hardening saw blade steel has the characteristics of short production flow, high efficiency, lower production cost, lower environmental pressure and the like.
Further, in the manufacturing method of the present invention, in the step (2), the heating temperature of the slab is controlled to be 1000-1200 ℃, and the temperature is kept for 1-3 hours.
Further, in the manufacturing method of the present invention, in the step (2), the slab heating temperature is controlled to be 1000 to 1150 ℃.
Accordingly, in certain embodiments, to obtain a better implementation effect, it may be further preferable to control the slab heating temperature to 1000-1200 ℃ and keep the temperature for 1-3 hours; more preferably, the slab heating temperature can be controlled to be 1000-1150 ℃; in order to improve the production efficiency and prevent the austenite grains from excessively growing and the surface of the steel billet from being severely oxidized, the heating temperature can be controlled to be 1000-1110 ℃ most preferably.
Further, in the manufacturing method of the present invention, in the step (3), the rough rolling temperature is controlled to 900 to 1150 ℃ and the finish rolling temperature is controlled to 850 to 950 ℃.
In the technical scheme of the invention, the medium carbon pre-hardening saw blade steel can be produced by adopting a rolling control cooling control (TMCP) process. In the step (3), it may be preferable to control the rough rolling temperature to 900 to 1150 ℃, the rolling reduction in the rough rolling stage to be more than 20%, and the finish rolling temperature to 850 to 950 ℃, and the rolling reduction in the finish rolling stage to be more than 40%.
In some embodiments, to obtain a better implementation effect, it may be further preferable to control the rough rolling temperature in the rolling process to 900-1100 ℃, the rolling reduction in the rough rolling stage to be greater than 20%, the finishing rolling temperature to be 860-930 ℃, and the rolling reduction in the finishing rolling stage to be greater than 40%.
Further, in the manufacturing method of the present invention, in the step (3), the rough rolling temperature is controlled to 900 to 1100 ℃, and the finish rolling temperature is controlled to 860 to 930 ℃.
Accordingly, in some other embodiments, it is more preferable that the rough rolling temperature during rolling is controlled to 900-1080 ℃, the rolling reduction in the rough rolling stage is more than 25%, the finish rolling temperature is controlled to 860-925 ℃, and the rolling reduction in the finish rolling stage is more than 45%.
Most preferably, the rough rolling temperature in the rolling process can be controlled to be 910-1080 ℃, the rolling reduction rate in the rough rolling stage is more than 28%, the finish rolling temperature is controlled to be 860-920 ℃, and the rolling reduction rate in the finish rolling stage is more than 50%.
Further, in the manufacturing method according to the present invention, in the step (3), the rolling reduction in the rough rolling stage is controlled to be more than 20%, and the rolling reduction in the finish rolling stage is controlled to be more than 40%.
Further, in the manufacturing method according to the present invention, in step (4), the cooling temperature is: (Ar 3 '-40) - (Ar 3' +40), (Ms+15℃) < final cooling temperature < (B) s -15 ℃ and the water cooling speed is 10-35 ℃/s.
Compared with the prior art, the medium carbon pre-hardening saw blade steel and the manufacturing method thereof have the following advantages and beneficial effects:
(1) From the aspect of chemical composition, the alloy composition of the saw blade steel is fully optimized in the chemical composition design, the saw blade steel is mainly low-alloy, and the saw blade steel can be ensured to have good mechanical properties while reducing the contents of carbon, alloying elements Cr, mo, ni and the like by fully utilizing the characteristics of refining, strengthening and the like of micro-alloying elements such as Nb, ti and the like.
(2) From the production process, the saw blade steel is produced by adopting a TMCP (rolling control and cooling control) process, and the structure type can be controlled by controlling technological parameters such as the start and finish rolling temperature, the rolling deformation, the cooling speed and the like in the TMCP process, so that the structure refining and strengthening effects are improved, the content of carbon and alloy elements is further reduced, and the steel plate with excellent mechanical properties, fatigue resistance and the like is obtained. In addition, the process has the characteristics of short production flow, high efficiency, energy conservation, low cost and the like.
(3) From the microstructure, the saw blade steel microstructure is bainite+ferrite+retained austenite+carbide or bainite+retained austenite+carbide, and the steel plate can be ensured to have excellent toughness and fatigue resistance.
(4) From the aspect of product performance, the saw blade steel has the advantages of high strength, high hardness and the like, has good welding performance, has Brinell hardness of more than 400HB, and has Charpy V-shaped longitudinal impact energy of more than 50J.
Compared with the prior patent, the steel has simple and reasonable component design, mainly takes medium and high carbon, manganese and vanadium as main additive elements, and reduces the production and manufacturing cost; in the rolling process, a controlled rolling and cooling process is adopted, and an online water cooling mode is adopted for cooling while fully refining the microstructure, so that an offline heat treatment process is omitted, the production flow is shortened, the production efficiency is improved, and the production cost is reduced. In order to reduce the hardenability of the steel plate, avoid the cracking of the steel plate, control the final cooling temperature in the Bs-Ms temperature range, ensure the hardenability and red hardness of the saw blade matrix, and also ensure the toughness requirement of the saw blade. In addition, the cooling temperature can be controlled within the range of (Ar 3 '-50) - (Ar 3' +50) DEG C, and the microstructure of the steel plate can be ensured to contain a certain proportion of ferrite soft phase, so that the toughness and fatigue resistance of the steel plate are further improved.
From the above, it can be seen that the content of carbon and alloy elements is scientifically designed, and the obtained saw blade steel has excellent mechanical properties (such as high strength and high hardness), mechanical processability, thermal stability and the like and welding performance through the refining strengthening effect of the alloy elements and the refining and strengthening effects of the control rolling and cooling processes.
The medium carbon pre-hardening saw blade steel has excellent toughness matching, the Brinell hardness is more than 400HB, the Charpy V-shaped longitudinal impact power is more than 50J, and the medium carbon pre-hardening saw blade steel can be effectively applied to the production and preparation of ultra-wide diamond saw blades, is beneficial to prolonging the service life, and has very good popularization prospect and application value.
Detailed Description
The medium carbon pre-hardened saw blade steel and the method of manufacturing the same according to the present invention will be further explained and illustrated with reference to specific examples, which however do not constitute undue limitations on the technical solution of the present invention.
Examples 1 to 8
The medium carbon pre-hardened saw blade steels of examples 1-8 were each prepared using the following steps:
(1) Smelting and casting were carried out according to the chemical composition ratios shown in tables 1-1 and 1-2.
(2) Heating: heating the obtained plate blank, controlling the heating temperature of the plate blank to be 1000-1200 ℃, and preserving heat for 1-3 hours; of course, the slab heating temperature may be preferably controlled to 1000-1150 ℃.
(3) Rolling: rolling the heated plate blank, controlling the rough rolling temperature to be 900-1150 ℃, the finish rolling temperature to be 850-950 ℃, and controlling the rolling reduction rate in the rough rolling stage to be more than 20% and the rolling reduction rate in the finish rolling stage to be more than 40%; of course, the rough rolling temperature may be preferably controlled to 900 to 1100℃and the finish rolling temperature may be preferably controlled to 860 to 930 ℃.
(4) And (3) online quenching: cooling is carried out by adopting water cooling, wherein the opening cooling temperature is as follows: (Ar 3 '-50) - (Ar 3' +50) DEG C, ms < final cooling temperature < Bs, then air cooling to room temperature, wherein the water cooling speed is 10-40 ℃/s; of course, the cooling temperature may also be preferably controlled to be: (Ar 3 '-40) - (Ar 3' +40) DEG C, the final cooling temperature is controlled to satisfy: (Ms+15℃) < final cooling temperature < (Bs-15 ℃) and then air-cooled to room temperature, and the water-cooling rate is preferably controlled to 10-35 ℃ per second.
It should be noted that the medium carbon pre-hardened saw blade steels of examples 1 to 8 of the present invention were prepared by the above steps, and the chemical components and the related process parameters thereof all meet the control requirements of the design specifications of the present invention.
Tables 1-1 and 1-2 set forth the mass percentages of each chemical element in the medium carbon pre-hardened saw blade steel of examples 1-8.
Table 1-1 (wt.%), the balance Fe and unavoidable impurities other than P, S
Tables 2-1 and 2-2 set forth specific process parameters for the medium carbon pre-hardened saw blade steels of examples 1-8 at each step of the above manufacturing process.
Table 2-1.
Table 2-2.
Note that: ar3' in Table 2-2 represents the temperature at which austenite starts to transform into ferrite during the in-line quenching of the test steel; bs represents the temperature at which bainite starts to transform; ms is expressed as the temperature at which martensite starts to transform.
The finally produced medium carbon pre-hardened saw blade steels of examples 1 to 8 were sampled respectively, and the medium carbon pre-hardened saw blade steel samples of examples 1 to 8 were observed and analyzed, and the microstructure of the saw blade steels according to examples 2, 3 and 8 of the present invention was observed to be bainite+ferrite+retained austenite+carbide, and the microstructure of the other examples was observed to be bainite+retained austenite+carbide.
Accordingly, after the microstructure of the medium carbon pre-hardened saw blade steel of examples 1-8 according to the present invention was observed, the hardness of the medium carbon pre-hardened saw blade steel samples of examples 1-8 may be further tested to obtain the brinell hardness of each example, and the test results may be listed in table 3 below.
The relevant Brinell hardness test means are as follows:
brinell hardness test: brinell hardness test was performed according to GB/T231.1 standard using a SCL246 Brinell hardness tester at room temperature. The surface locations of the medium carbon pre-hardened saw blade steel samples of examples 1-8 were each tested for hardness to obtain the corresponding brinell hardness.
Table 3 sets forth the Brinell hardness test results for the medium carbon pre-hardened saw blade steels of examples 1-8 at the surface locations.
Table 3.
After testing the brinell hardness of the medium carbon pre-hardened saw blade steels of examples 1-8, the medium carbon pre-hardened saw blade steels of examples 1-8 may be further resampled and the medium carbon pre-hardened saw blade steel samples of examples 1-8 were subjected to conventional performance testing to obtain impact energy at room temperature, with the test results set forth in table 4 below.
The relevant performance test means are as follows:
impact test: impact performance testing was performed according to the GB/T229 standard at room temperature using an SCL186750J instrumented impact tester to obtain the Charpy V-shaped longitudinal impact energy Akv for the medium carbon pre-hardened saw blade steels of each example.
Table 4 sets forth the impact work test results at room temperature for the medium carbon pre-hardened saw blade steels of examples 1-8.
Table 4.
As can be seen by referring to the above tables 3 and 4, the medium carbon pre-hardened saw blade steels of examples 1 to 8 according to the present invention have surface brinell hardness of 405 to 480HBW and average charpy V-shaped longitudinal impact energy Akv at room temperature of 58 to 115J.
From the above, it can be seen that the medium carbon pre-hardening saw blade steel can be obtained by reasonable chemical element composition design and matching with an optimization process. The saw blade steel has the advantages of ensuring lower production cost, higher strong hardness, better toughness and mechanical processing performance, easiness in welding, brinell hardness of more than 400HB and Charpy V-shaped longitudinal impact energy of more than 50J.
The medium carbon pre-hardening saw blade steel has excellent toughness matching, can be effectively applied to the production and preparation of ultra-wide diamond saw blades, is beneficial to prolonging the service life, and has very good popularization prospect and application value.
It should be noted that the prior art part in the protection scope of the present invention is not limited to the embodiments set forth in the present application, and all prior art that does not contradict the scheme of the present invention, including but not limited to the prior patent document, the prior publication, the prior disclosure, the use, etc., can be included in the protection scope of the present invention.
In addition, the combination of the features described in the present application is not limited to the combination described in the claims or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradiction occurs between them.
It should also be noted that the above-mentioned embodiments are merely examples of the present invention, and it is obvious that the present invention is not limited to the above-mentioned embodiments, and many similar variations are followed. All modifications attainable or obvious from the present disclosure set forth herein should be deemed to be within the scope of the present disclosure.
Claims (16)
1. A medium carbon pre-hardened saw blade steel containing Fe and unavoidable impurities, characterized in that it also contains the following chemical elements in mass percent:
c:0.46 to 0.60 percent, si:0.10 to 0.80 percent, mn:0.50 to 2.50 percent, B:0.0010 to 0.0050 percent, al: 0.010-0.070%, ti: 0.005-0.080%, ca:0.0010 to 0.0060% and Nb: 0.005-0.050%, cr:0.01 to 0.50 percent of Mo:0.01 to 0.80 percent of Ni:0.01 to 1.00 percent of RE:0.01 to 0.10 percent of Cu:0.10 to 0.40%.
2. The medium carbon pre-hardened saw blade steel according to claim 1, wherein the mass percentages of the chemical elements are:
c:0.46 to 0.60 percent, si:0.10 to 0.80 percent, mn:0.50 to 2.50 percent, B:0.0010 to 0.0050 percent, al: 0.010-0.070%, ti: 0.005-0.080%, ca:0.0010 to 0.0060% and Nb: 0.005-0.050%, cr:0.01 to 0.50 percent of Mo:0.01 to 0.80 percent of Ni:0.01 to 1.00 percent of RE:0.01 to 0.10 percent of Cu:0.10 to 0.40% of at least one of the following components; the balance being Fe and unavoidable impurities.
3. Medium carbon pre-hardened saw blade steel according to claim 1 or 2, characterized in that it comprises the following chemical elements in mass percent:
c:0.47 to 0.58 percent, si:0.15 to 0.80 percent, mn:0.50 to 2.00 percent, B:0.0010 to 0.0040 percent, al:0.010 to 0.060 percent, ti:0.005-0.070%, ca:0.0010 to 0.0050% and Nb:0.008 to 0.050 percent, cr:0.05 to 0.50 percent of Mo:0.05 to 0.70 percent of Ni: 0.10-0.90%, RE:0.01 to 0.08 percent, cu:0.10 to 0.35 percent of one or more than one of the following components; the balance being Fe and unavoidable impurities.
4. A medium carbon pre-hardened saw blade steel according to claim 3, wherein each chemical element thereof further satisfies at least one of the following:
C：0.48～0.58％；
Si：0.15～0.70％；
Mn：0.50～1.5％；
B：0.0010～0.0035％；
Ti：0.005～0.060％；
Al：0.015～0.055％；
Nb：0.008～0.045％；
Cr：0.05～0.45％；
Mo：0.05～0.60％；
Ni：0.1～0.8％；
RE：0.01～0.06％；
Cu：0.15～0.35％；
Ca：0.0010～0.0045％。
5. the medium carbon pre-hardened saw blade steel according to claim 1 or 2, wherein among the unavoidable impurities, P is 0.030% or less and S is 0.010% or less.
6. The medium carbon pre-hardened saw blade steel as claimed in claim 5 where among the unavoidable impurities P is 0.015% or less and S is 0.005% or less.
7. The medium carbon pre-hardened saw blade steel as claimed in claim 6, wherein among the unavoidable impurities, P is 0.012% or less and S is 0.003% or less.
8. Medium carbon pre-hardened saw blade steel according to claim 1 or 2, characterized in that its microstructure is bainite + ferrite + retained austenite + carbide or bainite + retained austenite + carbide.
9. Medium carbon pre-hardened saw blade steel according to claim 1 or 2, characterized in that it has a brinell hardness of more than 400HB and a charpy V-shape longitudinal impact energy of more than 50J.
10. A method of manufacturing a medium carbon pre-hardened saw blade steel according to any one of claims 1 to 9, comprising the steps of:
(1) Smelting and casting;
(2) Heating;
(3) Rolling;
(4) And (3) online quenching: cooling is carried out by adopting water cooling, wherein the opening cooling temperature is as follows: (Ar 3 '-50) - (Ar 3' +50) DEG C; ms < final cooling temperature < Bs, and then air cooling to room temperature, wherein the water cooling speed is 10-40 ℃/s.
11. The manufacturing method according to claim 10, wherein in the step (2), the slab heating temperature is controlled to 1000 to 1200 ℃, and the heat is preserved for 1 to 3 hours.
12. The manufacturing method according to claim 11, wherein in the step (2), the slab heating temperature is controlled to be 1000 to 1150 ℃.
13. The manufacturing method according to claim 10, wherein in the step (3), the rough rolling temperature is controlled to 900 to 1150 ℃ and the finish rolling temperature is controlled to 850 to 950 ℃.
14. The manufacturing method according to claim 13, wherein in the step (3), the rough rolling temperature is controlled to 900 to 1100 ℃ and the finish rolling temperature is controlled to 860 to 930 ℃.
15. The manufacturing method according to claim 10, wherein in the step (3), a rolling reduction in the rough rolling stage is controlled to be more than 20%, and a rolling reduction in the finish rolling stage is controlled to be more than 40%.
16. The method of manufacturing of claim 10, wherein in step (4), the chilling temperature is: (Ar 3 '-40) - (Ar 3' +40), (Ms+15℃) < final cooling temperature < (B) s -15 ℃ and the water cooling speed is 10-35 ℃/s.
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