CN117187696A - Steel for back material of bi-metal band saw blade and bi-metal band saw blade - Google Patents
Steel for back material of bi-metal band saw blade and bi-metal band saw blade Download PDFInfo
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- CN117187696A CN117187696A CN202311185191.9A CN202311185191A CN117187696A CN 117187696 A CN117187696 A CN 117187696A CN 202311185191 A CN202311185191 A CN 202311185191A CN 117187696 A CN117187696 A CN 117187696A
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- saw blade
- band saw
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- metal band
- back material
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 41
- 239000010959 steel Substances 0.000 title claims abstract description 41
- 239000000463 material Substances 0.000 title claims abstract description 39
- 229910052751 metal Inorganic materials 0.000 title claims description 23
- 239000002184 metal Substances 0.000 title claims description 23
- 239000000126 substance Substances 0.000 claims abstract description 8
- 238000010791 quenching Methods 0.000 abstract description 27
- 230000000171 quenching effect Effects 0.000 abstract description 27
- 238000000034 method Methods 0.000 abstract description 20
- 238000005520 cutting process Methods 0.000 abstract description 6
- 230000000052 comparative effect Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 238000000137 annealing Methods 0.000 description 5
- 238000005097 cold rolling Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 238000005496 tempering Methods 0.000 description 4
- 229910000599 Cr alloy Inorganic materials 0.000 description 3
- 206010057040 Temperature intolerance Diseases 0.000 description 3
- 230000008543 heat sensitivity Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910000997 High-speed steel Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- Heat Treatment Of Sheet Steel (AREA)
Abstract
The application discloses a steel for a back material of a bimetallic band saw blade, which comprises the following chemical components in percentage by mass: c:0.30-0.35%; mn:0.40-0.60%; si:0.20-0.35%; cr:1.35-2.10%; mo:1.40-1.70%; ni:0.20-0.80%; nb:0.01% -0.09%; s:0-0.01%; p:0-0.015%; v:0.30-0.40%; the balance being Fe. The application prevents the quenching deformation of the bimetal band saw blade in the quenching process and reduces the risk of the breakage of the bimetal band saw blade in the high-speed cutting process.
Description
Technical Field
The application relates to the field of bimetallic band saw blades, in particular to steel for a back material of a bimetallic band saw blade and a bimetallic band saw blade.
Background
The bimetallic band saw is widely used in industries such as mechanical manufacturing and the like for cutting various metals, and plays a great promoting role in the development of national economy; in order to enhance the wear resistance of the saw and simultaneously maintain high toughness, the saw teeth and the saw back of the saw are made of different metal materials, so that the saw has better sawing performance, wear resistance and toughness, and the saw with the saw teeth and the saw back made of different metals is called a bimetallic band saw; however, in order to ensure the usability of the bi-metal band saw, the choice of the back material of the bi-metal band saw is very important, and since the saw teeth are generally made of the high speed steel M42, it is required that the back material and the high speed steel M42 have good welding performance while maintaining high fatigue resistance.
The Chinese patent application with the application number of CN200610039788.2 discloses a bimetal hand saw blade and a production method thereof, and the process is universally applicable to the bimetal hand saw blade; the Chinese patent with the application number of CN201110166930.0 applies for a steel band for the saw back of a bimetallic saw and a production process thereof, and the process is currently commonly applicable to the band saw blade for the bimetallic industry.
Chinese patent publication No. CN109136746a discloses a steel strip for bimetal band saw backing material, which comprises the following chemical components in mass content: c is more than or equal to 0.29 and less than or equal to 0.33 percent; si is more than or equal to 0.20% and less than or equal to 0.35%; mn is more than or equal to 0.80% and less than or equal to 1.10%; cr is more than or equal to 3.50 and less than or equal to 4.20 percent; ni is more than or equal to 0.20% and less than or equal to 0.80%; mo is more than or equal to 1.00% and less than or equal to 1.40%; v is more than or equal to 0.30% and less than or equal to 0.40%; p is more than 0% and less than or equal to 0.02%; s is more than 0% and less than or equal to 0.025%; the balance being Fe. This patent is prone to the problem of deformation of the strip during quenching of the bi-metallic band saw blade.
The current grade of the back material of the steel for the bi-metal band saw blade is mainly three, the main classification method is determined according to the content of C, cr and Mo, other alloy elements are only through fine adjustment, D6A (C; 0.45-0.50%, cr:0.90-1.10%, mo: 0.90-1.10%) is a lower-end material, few domestic manufacturers use the steel, X32 (C; 0.29-0.33%, cr:3.80-4.00%, mo: 1.00-1.20%) is the most general grade, the use ratio is more than 90%, RM80 (C; 0.30-0.35%, cr:3.00-3.25%, mo: 2.00-2.25%) is the best material used in the saw blade at present, but the cost is higher, and the current use ratio is not more than 10%.
At present, the common alloy brand of back steel for the bimetallic band saw blade is X32, and the components are as follows:
C：0.29-0.33％；
Mn：0.90-1.10％；
Si：0.20-0.35％；
Cr：3.80-4.00％；
Mo：1.00-1.20％；
Ni：0.20-0.80％；
Nb：0.01％-0.09％；
S：0-0.01％；
P：0-0.015％；
V：0.30-0.40％；
the balance being Fe.
The processing process flow of the bimetal band saw blade comprises the following steps: back material and tooth material welding, annealing, welding seam flattening, leveling and straightening, fixed-length material preparation, tooth milling, tooth dividing, quenching, tempering, rolling, oiling and code spraying; the bimetal band saw blade has the advantages that the teeth are milled and separated during quenching, so that the tooth tip part of the saw blade is molded, the saw blade cannot be quenched in a lying manner in the quenching process to prevent the tooth tip from being damaged, and only the saw blade can be quenched vertically, if the product is uneven in structure, deformation is very easy to occur during the quenching process, and poor quenching defects such as transverse line straightness, snaking, wave bending and the like occur; the structure of the current universal saw blade backing material is X32, so that the phenomenon of deformation of the steel belt occurs in the quenching process of the bimetallic band saw blade, the performance of the bimetallic band saw blade is greatly reduced, and the qualification rate in the quenching process is reduced. The tensile strength and the yield strength of the backing material structure of the bimetallic band saw are far lower than those of the prior art, and the bimetallic band saw is mainly applied to a low-end bimetallic backing material, and the application further improves and optimizes the grade X32 (mentioned in strip 1) commonly used in the market at present.
Disclosure of Invention
The application aims to solve the technical problems of providing the steel for the back material of the bi-metal band saw blade and the bi-metal band saw blade, and aims to solve the defects in the prior art, and the phenomenon that the bi-metal band saw blade deforms when the steel band is quenched is avoided under the condition that the original performance is unchanged.
In order to solve the technical problems, the application adopts the following technical scheme: the steel for the bi-metal band saw blade backing comprises the following chemical components in percentage by mass:
C：0.30-0.35％；
Mn：0.40-0.60％；
Si：0.20-0.35％；
Cr：1.35-2.10％；
Mo：1.40-1.70％；
Ni：0.20-0.80％；
Nb：0.01％-0.09％；
S：0-0.01％；
P：0-0.015％；
V：0.30-0.40％；
the balance being Fe.
The application adjusts the Cr content from 3.7-4.0% to 1.35-2.10%, and improves the Mo content from 1.0-1.2% to 1.40-1.70%, thereby avoiding the phenomenon of deformation of the steel strip during quenching of the bimetallic strip saw blade.
The Chinese patent with publication number of CN104451421B discloses a high-toughness steel for a back material of a bimetallic band saw blade and a preparation method thereof, wherein the steel for the back material of the bimetallic band saw blade comprises the following components in percentage by weight: c:0.34 to 0.45 percent; si:0.20 to 0.40 percent; mn:0.70 to 0.90 percent; cr:3.30 to 3.60 percent; ni:0.50 to 0.70 percent; mo:0.90 to 1.20 percent; v:0.30 to 0.40 percent; nb:0.08 to 0.20 percent; al:0.015 to 0.05 percent; the balance of Fe and unavoidable impurities. Paragraph 61 of this patent teaches that "Cr can significantly improve strength, hardness and wear resistance, but at the same time reduce plasticity and toughness. Preferably 3.30 to 3.60% ". The specification of paragraph 63 of this patent states that "Mo improves the strength and temper stability of steel mainly by carbide and solid solution strengthening forms, and that a content of less than 0.90% has no obvious effect, and exceeding 1.2% reduces the toughness of steel. Preferably, the Mo content is 0.90 to 1.20%. Under the teaching of this patent, when the problem of deformation of the steel strip of the bi-metal band saw blade occurs during quenching in the bi-metal band saw blade backing steel X32, there is no motivation to lower the Cr content and increase the Mo content.
The application combines the experience of many years of research and development, and unexpectedly discovers that the problem that the bi-metal band saw blade steel X32 for the back material of the bi-metal band saw blade deforms during the quenching process can be related to the excessive Cr content.
In a preferred embodiment of the present application, the steel for a back material of a bi-metal band saw blade comprises the following chemical components in percentage by mass:
C：0.30-0.35％；
Mn：0.40-0.60％；
Si：0.20-0.35％；
Cr：1.35-1.65％；
Mo：1.40-1.70％；
Ni：0.20-0.80％；
Nb：0.01％-0.09％；
S：0-0.01％；
P：0-0.015％；
V：0.30-0.40％；
the balance being Fe.
Further preferably, the steel for the back material of the bimetallic band saw blade comprises the following chemical components in percentage by mass:
C：0.30-0.35％；
Mn：0.40-0.60％；
Si：0.20-0.35％；
Cr：1.35-1.65％；
Mo：1.60-1.70％；
Ni：0.20-0.80％；
Nb：0.01％-0.09％；
S：0-0.01％；
P：0-0.015％；
V：0.30-0.40％；
the balance being Fe.
In a preferred embodiment of the present application, the bi-metallic band saw blade backing steel is one or more of the grades X32, RM 80.
The existing back steel for the X32 bimetallic band saw blade has the Cr content of 3.80-4.00 percent. The Cr alloy content is higher, and the phenomenon of uneven structures such as a flowing line shape, a strip shape and the like easily occurs in the cold rolling process of the steel, so that the phenomenon of deformation of the steel strip occurs in the quenching process of the bimetallic band saw blade, and the performance of the bimetallic band saw blade is greatly reduced or the production yield is reduced.
Generally, when quenching deformation occurs in the quenching process, the quenching deformation is judged according to the severity of the quenching deformation, if a very serious distorted deformation product is directly scrapped, a slightly deformed product is rolled and flattened, but a procedure is added, special people are required to be arranged for rolling, and the stability of the product cannot be ensured in the rolling process.
The Mo content is 1.00-1.20%, and the Mo element can refine the structure in the steel belt and improve the heat sensitivity of the steel belt, so that the performance of the bimetal band saw blade is obviously improved by properly increasing the Mo element, especially under the condition that the application requirement of the bimetal band saw blade is higher and the cutting efficiency is higher, the fatigue performance requirement of the saw back is higher and higher, the Mo alloy content in the current brand is slightly lower, and the performance requirement cannot be met under the working condition that the body temperature of a plurality of high-speed saw cutting belts is high.
The key point of the application is the content range of Cr and Mo, which is mainly used for optimizing the quenching yield and fatigue performance of the steel for the back material of the bimetallic band saw blade.
The application also discloses a bimetal band saw blade, which adopts the steel for the back material of the bimetal band saw blade.
Compared with the prior art, the application has the following beneficial effects:
the application determines the optimized Cr and Mo components: after the Cr content is adjusted from 3.7-4.0% to 1.35-2.10% and the Cr alloy content is reduced, alloy ferrite is more easily and uniformly spheroidized in the annealing process of cold rolling and is not easy to generate a streamline or strip-shaped structure, thereby preventing the quenching deformation of the bimetallic band saw blade in the quenching process so as to influence the performance and reduce the quenching yield.
According to the application, the Mo content is optimized from 1.0-1.2% to 1.40-1.70%, so that the alloy content of Mo is properly increased, on one hand, the structure is thinned, the toughness of the bimetal backing material is improved, the heat sensitivity of the backing material is reduced, and the risk of interrupting the belt of the bimetal band saw blade in the high-speed cutting process is reduced.
Drawings
FIG. 1 shows a metallographic structure of a steel for a back material of a bimetallic band saw blade of comparative example 3 of the present application.
FIG. 2 shows a metallographic structure of a back material for a bi-metallic band saw blade according to example 1 of the present application.
FIG. 3 is a metallurgical structure of a steel for a back material of a bi-metallic band saw blade according to comparative example 3 of the present application.
FIG. 4 shows a metallographic structure of a back material for a bi-metallic band saw blade according to example 1 of the present application.
Detailed Description
Table A comparative examples 1-3 and example 1 ingredients
| C | Mn | Si | Cr | Mo | Ni | Nb | S | P | V | Fe | |
| Comparative example 1 | 0.29 | 0.45 | 0.28 | 2.68 | 1.12 | 0.72 | 0.04 | 0.004 | 0.008 | 0.27 | Allowance of |
| Comparative example 2 | 0.3 | 0.47 | 0.29 | 2.25 | 1.33 | 0.72 | 0.04 | 0.004 | 0.01 | 0.31 | Allowance of |
| Example 1 | 0.32 | 0.48 | 0.32 | 1.56 | 1.62 | 0.73 | 0.06 | 0.006 | 0.008 | 0.28 | Allowance of |
| Comparative example 3 | 0.32 | 0.48 | 0.32 | 3.7 | 1.00 | 0.73 | 0.06 | 0.006 | 0.008 | 0.28 | Allowance of |
The production process comprises the following basic steps: the method comprises the steps of (1) EAF primary refining, LF refining, VD refining, continuous casting and rolling, wherein the percentages are calculated by mass percent; the concrete preparation flow of the production is an example 1 of a steel belt for the saw back of a bimetal saw and the production process thereof in Chinese patent application number 201110166930.0.
Table II Performance index of comparative examples 1-3 and example 1
After the implementation of comparative examples 1 to 3 and example 1, the performance of the steel for the back material of the bimetal saw blade (such as comparative example 3) is achieved by detecting indexes such as tensile strength resistance, yield strength, elongation and the like according to GB228-87 by adopting a universal tester after quenching and tempering, and then the linear structure of the flow and the structure after quenching and tempering are detected, and finally, the scheme is confirmed to be example 1;
after the content of Cr is optimized, the temperature is adjusted from 3.7-4.0% to 1.35-1.65%, the annealing state of the backing material is the annealing state after cold rolling, the probability of streamline structure is greatly reduced, and the detailed metallographic structure is shown in figures 1-2. In comparative example 3, a streamlined or banded structure (FIG. 1) was present, and in the present application, by reducing the Cr content to 1.35-1.65%, example 1 was not likely to appear in the streamlined or banded structure (FIG. 2).
After the Mo content is increased, the structure after tempering is obviously refined from 1.0-1.2% to 1.35-1.65% under the same heat treatment process, the detailed metallographic structure is shown in fig. 3-4, and the structure in fig. 4 (example 1) is obviously refined.
The application finally determines and optimizes the components of Cr and Mo: after the Cr content is adjusted from 3.7-4.0% to 1.35-1.65% and the Cr alloy content is reduced, alloy ferrite is easier to be uniformly spheroidized in the annealing process of cold rolling and is not easy to generate a streamline or strip-shaped structure, so that the quenching deformation of the bimetallic strip saw blade in the quenching process is prevented, the performance is influenced and the quenching yield is reduced; the Mo content is optimized from 1.0-1.2% to 1.35-1.65%, so that the alloy content of Mo is properly increased, on one hand, the structure is thinned, the toughness of the bimetal back material is improved, the heat sensitivity of the back material is reduced, and the risk of interrupting the band of the bimetal band saw blade in the high-speed cutting process is reduced.
Claims (5)
1. The steel for the bi-metal band saw blade backing is characterized by comprising the following chemical components in percentage by mass:
C：0.30-0.35％；
Mn：0.40-0.60％；
Si：0.20-0.35％；
Cr：1.35-2.10％；
Mo：1.40-1.70％；
Ni：0.20-0.80％；
Nb：0.01％-0.09％；
S：0-0.01％；
P：0-0.015％；
V：0.30-0.40％；
the balance being Fe.
2. The steel for a back material of a bi-metal band saw blade according to claim 1, comprising the following chemical components in mass percent:
C：0.30-0.35％；
Mn：0.40-0.60％；
Si：0.20-0.35％；
Cr：1.35-1.65％；
Mo：1.40-1.70％；
Ni：0.20-0.80％；
Nb：0.01％-0.09％；
S：0-0.01％；
P：0-0.015％；
V：0.30-0.40％；
the balance being Fe.
3. The steel for a back material of a bi-metal band saw blade according to claim 1, comprising the following chemical components in percentage by mass:
C：0.30-0.35％；
Mn：0.40-0.60％；
Si：0.20-0.35％；
Cr：1.35-1.65％；
Mo：1.60-1.70％；
Ni：0.20-0.80％；
Nb：0.01％-0.09％；
S：0-0.01％；
P：0-0.015％；
V：0.30-0.40％；
the balance being Fe.
4. The steel for a back material of a bi-metal band saw blade according to claim 1, wherein the steel for a back material of a bi-metal band saw blade has one or more of the designations X32 and RM 80.
5. A bi-metallic band saw blade, characterized in that the steel for a back material of a bi-metallic band saw blade according to any one of claims 1 to 4 is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311185191.9A CN117187696A (en) | 2023-09-14 | 2023-09-14 | Steel for back material of bi-metal band saw blade and bi-metal band saw blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311185191.9A CN117187696A (en) | 2023-09-14 | 2023-09-14 | Steel for back material of bi-metal band saw blade and bi-metal band saw blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117187696A true CN117187696A (en) | 2023-12-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311185191.9A Pending CN117187696A (en) | 2023-09-14 | 2023-09-14 | Steel for back material of bi-metal band saw blade and bi-metal band saw blade |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117187696A (en) |
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2023
- 2023-09-14 CN CN202311185191.9A patent/CN117187696A/en active Pending
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