CN104532150A - Economical and ultra-wide saw steel and preparation method thereof - Google Patents
Economical and ultra-wide saw steel and preparation method thereof Download PDFInfo
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Abstract
The invention discloses economical and ultra-wide saw steel and a preparation method thereof. The economical and ultra-wide saw steel comprises one or more of the following components in percentage by weight: 0.35%-0.45% of C, 0.10%-0.50% of Si, 0.60%-1.20% of Mn, not more than 0.030% of P, not more than 0.010% of S, 0.0010%-0.0040% of B, 0.010%-0.080% of Al, not more than 0.060% of Ti, 0.0010%-0.0080% of Ca, not more than 0.0080% of N, not more than 0.0080% of O, not more than 0.0004% of H, 0.001%-0.050% of Nb, 0.01%-0.50% of Cr, 0.01%-0.50% of Mo, 0.01%-0.50% of Ni, 0.01%-0.15% of V, and the balance of Fe and inevitable impurities, wherein (Cr/5+Mn/6+50B) is smaller than or equal to 0.45% and greater than or equal to 0.15%. The yield strength of the steel is greater than 850MPa; the tensile strength is 1000-1400MPa; the ductility is greater than 10%; and the charpy V-type longitudinal impact strength can be 50-90J. Through high-temperature final rolling, online water cooling and tempering processes, the steel plate which is 6.0-16.0mm thick is produced, and is processed into saw blade bodies of which the diameters are 1700-4500mm; the section of each whole saw blade body can be 30-40HRC; and the hardness value is uniform in distribution.
Description
Technical field
The present invention relates to steel for saw blade substrate, particularly relate to a kind of economical, ultra-wide steel saw blade and manufacture method thereof, this steel yield strength is greater than 850MPa, tensile strength 1000 ~ 1400MPa, unit elongation is for being greater than 10%, and Rockwell hardness is 30 ~ 40HRC, and the summer can reach 50-90J than V-type impact of collision merit.
Background technology
Diamond disc steel, its cutting object is the stone material such as grouan, marble.Because diamond saw blade cuts stone material with high speed rotating, the linear velocity of usual cutting granite is 25 ~ 40m/s, and the linear velocity of cutting marble is 45 ~ 60m/s.Have the saw blade of certain vibrational frequency, in cutting process, vibrational frequency increases, and can produce resonance effect.This just requires that saw blade has high elastic limit and high yield tensile ratio, secondly, due to the roughness of saw blade, or saw blade is installed bad, produces wall pressure and makes saw blade alternating bending, cause saw blade rigidity to reduce, or fatigure failure occurs, so saw blade also should have high rigidity and fatigue strength during cutting, moreover, in cutting process, saw blade will bear the centrifugal force that high speed rotating produces, cutting pressure and the surging force of circulation are born in tank position, saw blade also should have certain obdurability, for this reason, saw blade must obtain use properties requirement by modifier treatment, because saw blade quenches in oil, temper again, tempering time is generally at 12 ~ 14 hours, this quenching-and-tempering process has distinct disadvantage technically, first be complex manufacturing, cycle is long, energy consumption is high, next is the environmental pollution that oil quenching causes, as US Patent No. 4140524A, US5863358A, Japanese Patent JP08013030A and European patent EP 0530175A2.Chinese patent CN1241645A, CN02116753.2, CN1212193A, ZL2005100283124 etc.
Be necessary to develop intensity, red hardness, better, the environmentally friendly saw blade steel of toughness for this reason.
Summary of the invention
The object of the invention is to be to provide a kind of economical, ultra-wide steel saw blade and manufacture method thereof, this steel yield strength is greater than 850MPa, tensile strength 1000 ~ 1400MPa, and unit elongation is for being greater than 10%, Rockwell hardness is 30 ~ 40HRC, can be applied to diameter and reach 1700 ~ 4500mm saw blade lamellar body.
For achieving the above object, technical scheme of the present invention is:
The present invention with medium high carbon, manganese, chromium, boron for main Addition ofelements, casting after electric furnace (converter)-LF-VD (RH) smelts, by high-temperature final rolling, online water-cooled, tempering process process, produce thickness of slab 6.0-16.0mm steel plate, be reprocessed into diameter and reach 1700-4500mm saw blade lamellar body, whole saw blade lamellar body section hardness can reach 30-40HRC, and hardness value is evenly distributed.
Concrete, of the present invention economical, ultra-wide steel saw blade, its composition by weight percent is: C:0.35 ~ 0.45%, Si:0.10 ~ 0.50%, Mn:0.60 ~ 1.20%, P≤0.030%, S≤0.010%, B:0.0010 ~ 0.0040%, Al:0.010 ~ 0.080%, Ti≤0.060%, Ca:0.0010 ~ 0.0080%, N≤0.0080%, O≤0.0080%, H≤0.0004%, and Nb 0.001 ~ 0.050%, Cr 0.01 ~ 0.50%, Mo 0.01 ~ 0.50%, Ni 0.01 ~ 0.50%, one or more in V 0.01 ~ 0.15%, 0.15%≤(Cr/5+Mn/6+50B)≤0.45%, all the other are Fe and inevitable impurity.
In the present invention, main fundamental element effect has the following aspects:
C, 0.35-0.45% are strengthening elements most economical, the most basic in steel, are the important elements ensureing quenching hardness and hardening capacity.
Si, 0.10-0.50%, suitable silicone content can help deoxidation, and forms silicate together with calcium aluminium, contributes to improving machinability.But too high silicone content can increase the fragility of steel.
Mn, 0.60-1.20% are the important elements ensureing quenching hardness and hardening capacity.
Cr, 0.01-0.50%, add chromium, mainly improves hardening capacity.Because chromium is the alloying element that can significantly improve hardening capacity, after adding, can hardening capacity be improved, especially improve the hardening capacity of large-diameter saw blade matrix.
Mo, 0.01-0.50%, can crystal grain thinning, improves intensity and toughness.Molybdenum is present in solid solution phase and Carbide Phases in steel, therefore, has the effect of solution strengthening and carbide dispersion-strengthened containing molybdenum steel simultaneously.Molybdenum can improve tempering and stablize.
Ni, 0.01-0.50%, nickel can reduce critical cooling velocity, improve the hardening capacity of steel.
The crystal grain thinning of Nb, 0.001-0.050%, Nb and precipitation strength effect, be very significant to the contribution of raising Fracture of Material, be the forming element of strong C, N compound, suppress Austenite Grain Growth consumingly.
V, 0.01-0.15%, have higher precipitation strength effect.V mainly makes steel strengthen by tiny VC, VN particle generated after thermal treatment, and the content therefore improving C, N in steel increases intensifying factor with the nitride or carbide that form vanadium.
Ca, 0.0010-0.0080%, Calcium treatment can control inclusion morphology, improves the mobility of molten steel in casting cycle.
N≤0.0080%, in Vanadium Microalloyed Plate Steels, suitable nitrogen content can improve the red hardness of steel.But too high nitrogen content can damage the toughness of steel, also can increase the fragility of continuously cast bloom, reduce manufacturability.
O≤0.0080%, H≤0.0004%, nitrogen too much in steel and hydrogen are especially very disadvantageous to weldability, impelling strength and splitting resistance to the performance of steel, reduce quality and the work-ing life of steel plate, but control sternly significantly to increase production cost.
B, 0.0010 ~ 0.0040%, boron increases the hardening capacity of steel but too high levels will cause hot-short phenomenon, affects welding property and the hot workability of steel, therefore need strictly control B content.
Al, 0.010-0.080%, suitable aluminium content can help deoxidation, and forms the lower melting point inclusion being easy to float together with calcium, silicon, improves purity of steel.
Ti≤0.060%, titanium is one of carbide, forms trickle TiC particle with carbon, improves the wear resistance of steel.
P ,≤0.030% and S ,≤0.010%, reduce this two impurity content as far as possible, to reduce segregation, improve purity of steel, and improve the toughness of steel.
Cr, Mn and B, meeting on each constituent content claimed range basis, needing again satisfied 0.15%≤(Cr/5+Mn/6+50B)≤0.45%.Cr, Mn and B are the main alloy element of the hardening capacity improving steel in the present invention, but the impact effect of the hardening capacity to steel of each element is different, therefore the equivalent of " Cr/5+Mn/6+50B " steel grade hardening capacity is controlled in present component design, content and the proportioning of each alloying element is controlled by this equivalent, obtain the best effect of the hardening capacity affecting steel grade of the present invention: both can not be too low and reduce the hardening capacity of steel due to content, affluence can not measure excessive because of too high levels again, even cause the waste of alloying element, reduce the toughness, welding property etc. of steel.
The manufacture method of economical, ultra-wide steel saw blade of the present invention, is characterized in that, comprise the steps:
1) smelt, cast
Smelt by mentioned component, continuous casting or die casting, need through just rolling into steel billet after die casting, after continuously cast bloom or die casting, cogged ingot adopts slow cooling;
2) rolling
Continuously cast bloom or bloom heating, Heating temperature 1100 DEG C ~ 1250 DEG C, finishing temperature 850 ~ 950 DEG C, rolls rear steel plate and adopts water-cooled, begin to cool down temperature: 780 ~ 850 DEG C; Stop cooling temperature: 250 ~ 450 DEG C, speed of cooling, 30 ~ 70 DEG C/s; If stop cooling temperature 300 ± 50 DEG C, metallographic structure is martensite; Stop cooling temperature 400 ± 50 DEG C, metallographic structure is martensite+a small amount of troostite;
3) tempering
Tempering temperature is 350 ~ 550 DEG C, and organizing after its tempering of metallographic structure of different stopping cooling temperature is also different, stops the metallographic structure of cooling temperature 300 ± 50 DEG C, is organized as tempered sorbite tissue after 350 ~ 550 DEG C of tempering; Stop the metallographic structure of cooling temperature 400 ± 50 DEG C, be organized as tempered sorbite+troostitic structures after 350 ~ 550 DEG C of tempering, tempered-hardness is all 30 ~ 40HRC.
Beneficial effect of the present invention:
Compared with previous patent, composition of steel simplicity of design of the present invention, rationally, mainly with medium high carbon, manganese, boron for main Addition ofelements, reduce manufacturing cost; In the operation of rolling, adopt cooling controlling and rolling controlling process, while abundant refinement microstructure, adopt online water-cooling pattern to cool, eliminate out-line quenching technique, shorten Production Flow Chart, enhance productivity, reduce production cost.For reducing the hardenability of steel plate, avoid steel plate to ftracture, stop cooling temperature controlling at 250-500 DEG C, the tempered sorbite tissue of excellent combination property can be obtained by off-line tempering, ensure that diameter reaches hardening capacity and the red hardness of 1700-4500mm saw bit matrix, also ensure that the toughness reguirements of saw blade.Saw bit matrix involved in the present invention has excellent obdurability coupling, is of value to and increases the service life.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
The steel saw blade of following examples 1-6 and comparative example 1 (in CN1212193 embodiment) steel saw blade, the weight percent of its chemical composition is as shown in table 1.
The steel saw blade of embodiment 1-10 and the manufacture method of comparative example 1 steel saw blade are:
Corresponding raw materials for metallurgy is carried out successively in accordance with the following steps: smelting → casting → heating → rolling → quenching → tempering.
The concrete technology parameter of embodiment 1-6 and comparative example 1 is as shown in table 2.Mechanical property is as shown in table 3-table 5.
As known from Table 5, the mechanical property of steel plate of embodiment of the present invention 1-6 is excellent, meets user's requirement, and is obviously better than contrasting steel grade 1.
The tensile property of table 3 steel of the present invention
The quenching state hardness of table 4 steel of the present invention, HRC
| Surface hardness | 1/4 thick hardness | 1/2 thick hardness | |
| Embodiment 1 | 49.4/47.4/48.6 | 47.7/47.4/47.5 | 47.3/47.3/47.5 |
| Embodiment 2 | 48.9/48.1/47.3 | 48.3/48.0/47.2 | 48.0/48.1/47.3 |
| Embodiment 3 | 48.5/48.2/47.2 | 48.0/47.5/48.1 | 47.8/48.0/48.1 |
| Embodiment 4 | 48.2/48.0/47.6 | 48.1/47.8/48.0 | 48.0/48.0/48.1 |
| Embodiment 5 | 48.3/48.0/47.6 | 48.1/48.0/47.8 | 47.8/48.0/448.1 |
| Embodiment 6 | 48.1/47.9/47.7 | 48.0/47.8/47.8 | 48.1/47.9/47.9 |
The quenching+tempering state hardness of table 5 steel of the present invention, HRC
The quenching+tempering impelling strength of table 6 steel of the present invention
Claims (4)
1. one kind economical, ultra-wide steel saw blade, its composition by weight percent is: C:0.35 ~ 0.45%, Si:0.10 ~ 0.50%, Mn:0.60 ~ 1.20%, P≤0.030%, S≤0.010%, B:0.0010 ~ 0.0040%, Al:0.010 ~ 0.080%, Ti≤0.060%, Ca:0.0010 ~ 0.0080%, N≤0.0080%, O≤0.0080%, H≤0.0004%, and Nb 0.001 ~ 0.050%, Cr0.01 ~ 0.50%, Mo 0.01 ~ 0.50%, Ni 0.01 ~ 0.50%, one or more in V 0.01 ~ 0.15%, 0.15%≤(Cr/5+Mn/6+50B)≤0.45%, all the other are Fe and inevitable impurity.
2. economical, ultra-wide steel saw blade as claimed in claim 1, it is characterized in that, this steel yield strength is greater than 850MPa, tensile strength 1000 ~ 1400MPa, and unit elongation is for being greater than 10%, and Rockwell hardness is 30 ~ 40HRC.
3. the manufacture method of economical, ultra-wide steel saw blade as claimed in claim 1, is characterized in that, comprise the steps:
1) smelt, cast
Smelt by composition described in claim 1, continuous casting or die casting, need through just rolling into steel billet after die casting, after continuously cast bloom or die casting, cogged ingot adopts slow cooling;
2) rolling
Continuously cast bloom or bloom heating, Heating temperature 1100 DEG C ~ 1250 DEG C, steel plate finishing temperature 850 ~ 950 DEG C, rolls rear steel plate and adopts water-cooled, begin to cool down temperature: 780 ~ 850 DEG C; Stop cooling temperature: 250 ~ 450 DEG C, speed of cooling, 30 ~ 70 DEG C/s; If stop cooling temperature 300 ± 50 DEG C, metallographic structure is martensite; Stop cooling temperature 400 ± 50 DEG C, metallographic structure is martensite+a small amount of troostite;
3) tempering
Tempering temperature is 350 ~ 550 DEG C, and organizing after its tempering of metallographic structure of different stopping cooling temperature is also different, wherein, stops the metallographic structure of cooling temperature 300 ± 50 DEG C, is organized as tempered sorbite tissue after 350 ~ 550 DEG C of tempering; Stop the metallographic structure of cooling temperature 400 ± 50 DEG C, be organized as tempered sorbite+troostitic structures after 350 ~ 550 DEG C of tempering, tempered-hardness is 30 ~ 40HRC.
4. the steel saw blade that manufactures of the manufacture method of economical, ultra-wide steel saw blade as claimed in claim 3, its yield strength is greater than 850MPa, tensile strength 1000 ~ 1400MPa, and unit elongation is for being greater than 10%, and Rockwell hardness is 30 ~ 40HRC.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105543630A (en) * | 2015-12-21 | 2016-05-04 | 秦皇岛首秦金属材料有限公司 | Steel for boron-contained high carbon saw blade and manufacturing method thereof |
| CN106756511A (en) * | 2017-01-10 | 2017-05-31 | 湖南华菱涟源钢铁有限公司 | D6A hot-rolled wide strip steel for bimetal saw blade backing material and production method thereof |
| CN115852262A (en) * | 2021-09-23 | 2023-03-28 | 宝山钢铁股份有限公司 | Saw blade steel and manufacturing method thereof |
| CN116121644A (en) * | 2022-12-23 | 2023-05-16 | 江阴兴澄特种钢铁有限公司 | High-toughness mine disc saw blade steel plate and manufacturing method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110777295B (en) * | 2019-09-30 | 2021-04-02 | 鞍钢股份有限公司 | A kind of hot-rolled steel strip for diamond saw blade base and its manufacturing method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105543630A (en) * | 2015-12-21 | 2016-05-04 | 秦皇岛首秦金属材料有限公司 | Steel for boron-contained high carbon saw blade and manufacturing method thereof |
| CN106756511A (en) * | 2017-01-10 | 2017-05-31 | 湖南华菱涟源钢铁有限公司 | D6A hot-rolled wide strip steel for bimetal saw blade backing material and production method thereof |
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| CN115852262A (en) * | 2021-09-23 | 2023-03-28 | 宝山钢铁股份有限公司 | Saw blade steel and manufacturing method thereof |
| CN116121644A (en) * | 2022-12-23 | 2023-05-16 | 江阴兴澄特种钢铁有限公司 | High-toughness mine disc saw blade steel plate and manufacturing method thereof |
| CN116121644B (en) * | 2022-12-23 | 2024-11-29 | 江阴兴澄特种钢铁有限公司 | A high-toughness mining circular saw blade steel plate and its manufacturing method |
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