CN104087839B - The ultra-thin laser weld steel for saw blade substrate of hot rolling and production method - Google Patents
The ultra-thin laser weld steel for saw blade substrate of hot rolling and production method Download PDFInfo
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- CN104087839B CN104087839B CN201410343544.8A CN201410343544A CN104087839B CN 104087839 B CN104087839 B CN 104087839B CN 201410343544 A CN201410343544 A CN 201410343544A CN 104087839 B CN104087839 B CN 104087839B
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Abstract
The ultra-thin laser weld steel for saw blade substrate of hot rolling, its component and wt%:C:0.26% ~ 0.34%, Si:0.25% ~ 0.37%, Mn:0.40% ~ 0.60%, P :≤0.015%, S :≤0.005%, N :≤0.006%, Cr:0.80 ~ 1.10%, Mo:0.15 ~ 0.25%, Ti:0.005 ~ 0.045; Production stage: smelt also continuous casting and become base; Strand is heated; Rolling; Laminar flow is cooling; Batch; Coil of strip in storehouse or in stay-warm case slow cooling to room temperature; Finishing. Steel plate tensile strength of the present invention is 600 ~ 900MPa, percentage elongation A is 15 ~ 28%, hardness is at 160 ~ 260HB, and steel coil head and the fluctuation of middle part tensile strength are less than 150MPa, one side practical decarburized depth be less than steel plate thickness≤1.1%, after quenching, hardness fluctuations is less than 2HRC, reduced thickness≤100 μ the m of limit portion, unevenness≤12mm/m, product thickness is 1.0 ~ 3.0mm, can partly realize " with hot Dai Leng ", reduce costs.
Description
Technical field
The present invention relates to a kind of hot-strip and production method, belong to particularly the ultra-thin laser weld saw blade of a kind of hot rolling baseSteel and production method for body.
Background technology
Laser weld steel for saw blade substrate need to have good welding performance, hardenability, good toughness and suitableIntensity etc. Laser weld steel for saw blade substrate often adopts hot rolling technology to produce at present, is mainly divided into old process and sheet billet and connectsCasting tandem rolling flow process, its product thickness is more than 3.0mm.
In recent years, along with the increase of " with hot Dai Leng " demand, increasing to the demand of hot rolled thin dimension saw sheet matrix steel,Especially thickness is 2.5mm and following product. But to old process, the difficulty of producing this thin slab product is very large, existThe problems such as decarburized layer is serious, composition is uneven, banded structure is serious and plate shape is poor, need extra increasing while producing thin slab productMore transition material. In the time adopting sheet billet continuously casting and rolling to produce thin specification steel saw blade, also exist plate shape poor, especially the limit of stripPortion's attenuate is large, finished product is aligned rear unevenness conventionally more than 12mm, even also difficult by the multi-pass straightening process of rear operationEspecially fluctuate end to end greatlyr to reach the higher and mechanical property of good plate shape, hardness, conventionally, more than 150MPa, cause useFamily processing and use difficulty, even cannot be used.
Through retrieval, the patent documentation that China Patent Publication No. is CN101773929A, it discloses a kind of sheet blank continuous castingThe method of rolling production 30CrMo steel, its composition and production technology are: C:0.26% ~ 0.34%, Si:0.17% ~ 0.37%, Mn:0.40% ~ 0.70%, P :≤0.035%, S :≤0.035%, Cr:0.80 ~ 1.10%, Mo:0.15 ~ 0.25%, all the other are Fe and can notThe impurity of avoiding, main production is: strand liquid core is depressed 5 ~ 15mm, 30 ~ 40 DEG C of molten steel overheats, strand charging temperature950 ~ 1050 DEG C, 830 ~ 930 DEG C of finishing temperatures, coiling temperature is 520 ~ 620 DEG C. The document has been mainly concerned with thicknessThe production method of the above steel of 2.5mm. Its deficiency: in alloying component, there is no to add the alloy that residual O and N are combined in steelElement ti, the O that these are free and N meeting segregation, at crystal boundary, cause toughness of material and fatigue behaviour to reduce, due to laser weld saw bladeMatrix is for a long time 100 ~ 300 DEG C of work, and therefore, under this composition, the fatigue behaviour of product is lower, and service life is shorter, in additionAlso easily there is limit portion crackle in the segregation due to N in casting process, the too low meeting of finishing temperature and coiling temperature causes materialPlate shape is as poor in unevenness, and intensity is higher, toughness drop, and especially for thin specification saw blade, the too low material injustice that causes of temperature, andBe difficult to eliminate by the mode such as smooth, affect the normal use of product.
China Patent Publication No. is the patent documentation of CN102345071A, has also mentioned the conventional hot rolling flow process of a kind of employing,And the method that adds B produce thick specification 30CrMo steel plate in steel. It discloses a kind of method of the 30CrMo of production steel, its compositionAnd production technology is: C:0.28% ~ 0.33%, and Si:0.20% ~ 0.35%, Mn:0.60% ~ 0.80%, P :≤0.018%, S :≤0.005%, Cr:0.90 ~ 1.10%, Mo:0.15 ~ 0.25%, Als:0.20 ~ 0.40%, B:0.0008 ~ 0.0015, all the other be Fe andInevitably impurity, adopts conventional hot continuous rolling machine explained hereafter, and main production is: heating-up temperature≤1300 DEG C, one-phase1050 ~ 1150 DEG C of start rolling temperatures, two-stage open rolling≤950 DEG C, 840 ~ 940 DEG C of finishing temperatures, enter burial pit cooling after finish to gauge,Slow cooling temperature >=400 DEG C, slow cooling time >=36 hour. The document will relate to the producer of thickness 50mm, 100mm steelMethod. Its deficiency: its product exists equally owing to not adding alloying element Ti etc., is easy to cause sheet billet continuous casting process slab crackleWith reduction fatigue behaviour. The B adding in its steel in addition is also easy to cause the quality problems such as slab limit portion crackle, but its mainly forCompared with thick steel plates, coiling temperature can not controlled, and does not therefore have the problems such as plate shape is bad, but that this technique can not be used for is thinThe production of specification steel.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, it is 600 ~ 900MPa that a kind of steel plate tensile strength is provided, and percentage elongation A is 15~ 28%, hardness is at 160 ~ 260HB, and steel coil head and the fluctuation of middle part tensile strength are less than 150MPa, and one side practical decarburized depth is less thanFinished steel plate thickness≤1.1%, after quenching, hardness fluctuations is less than 2HRC, the reduced thickness≤100 μ m of limit portion, unevenness≤12mm/M, the ultra-thin laser weld steel for saw blade substrate of hot rolling and production method that product thickness is 1.0 ~ 3.0mm.
The present invention is by controlling the low carbon content in molten steel, alleviated on the one hand the component segregation of original strand and finished productBanded structure, has improved the welding performance of steel on the other hand. By the control of the elements such as low Mn, P, S, further reduce formerThe defects such as the segregation of beginning strand, improve slab quality. By add appropriate Ti element in molten steel, on the one hand can be effectively curingN element in molten steel, reduces strand because the higher strip edge causing of free nitrogen splits defect, can improve on the other hand the heat of steelStability.
By taking to improve strand charging temperature at 900 ~ 1100 DEG C, can effectively reduce the decarburized layer deepness of product surface.Higher tapping temperature and finishing temperature, can increase the metal flow in System on Rolling Steel, is conducive to plate shape and controls. RollingCheng Zhong, adopt increase upstream two frames be F1 and F2 percentage pass reduction 50% ~ 70%, last two passage F6 and F7 percentage pass reductionAdopt and gently depress 5% ~ 20%, be preferably no more than 10%, can further improve the plate shape of steel, especially alleviate the limit portion of steelReduced thickness; And due to the raising of rolling temperature, reduce because upstream frame drafts increases the load causing and increased. AdoptRespectively at 5 ~ 15 meters of coiling temperatures that scope is cooling and not higher, can improve the performance uniformity of coil of strip total length direction with end to end. SeparatelyCan there is sufficient ferrite-pearlite phase transformation in outer higher coiling temperature, avoid the bainitic transformation in steel, reduction steelIntensity and hardness, be conducive to the aligning of rear operation, further reduces the unevenness of steel and improve the plate shape of steel.
Realize the technical measures of above-mentioned purpose:
The ultra-thin laser weld steel for saw blade substrate of hot rolling, its component and weight percent content are: C:0.26% ~ 0.34%,Si：0.25%~0.37%，Mn：0.40%~0.60%，P：≤0.015%，S：≤0.005%，N：≤0.006%，Cr：0.80~1.10%，Mo:0.15 ~ 0.25%, Ti:0.005 ~ 0.045, all the other are Fe and inevitable impurity.
Preferably: C weight percent content is: 0.26% ~ 0.31%.
The method of the ultra-thin laser weld steel for saw blade substrate of production hot rolling, its step:
1) smelt also continuous casting and become base, wherein: control and water steel temperature at 1520 ~ 1550 DEG C, slab thickness is at 50 ~ 60mm;
2) strand is heated: control strand charging temperature at 900 ~ 1100 DEG C, tapping temperature, at 1130 DEG C ~ 1250 DEG C, is castBase time inside furnace 10 ~ 40min, air-fuel ratio≤1.4 in stove;
3) be rolled: rolling pass is 7 passages; Control finishing temperature at 880 ~ 920 DEG C; Control front two percentage pass reductions50% ~ 70%, control last two percentage pass reductions 5% ~ 20%;
4) carry out laminar flow cooling: take front segmentation cooling, cooling velocity is not less than 15 DEG C/s; At head and the afterbody of coil of strip5 ~ 15m scope is not carried out water-cooled;
5) batch, coiling temperature is controlled at 620 DEG C ~ 700 DEG C;
6) coil of strip in storehouse or in stay-warm case slow cooling to room temperature;
7) carry out finishing.
Preferably: slab thickness is at 50 ~ 56mm.
Preferably: in finishing stands, F6, F7 percentage pass reduction are no more than 10%.
Preferably: the cooling employing of front segmentation is interrupted opening ways and carries out cooling.
Preferably: strand tapping temperature is at 1130 DEG C ~ 1200 DEG C.
The effect of each element in the present invention
C: carbon is the main solution strengthening effect that rises in steel, only has carbon content higher than 0.26 o'clock, and its invigoration effect is just enough brightAobvious, but the too high welding performance that affects of carbon content, especially for laser weld steel for saw blade substrate, carbon content is too high to be brought in productHeart segregation, reduces the welding performance of product greatly, and therefore carbon content is the highest is no more than 0.34%, and preferably, C content is chosen as0.26%~0.31%。
Mn:Mn is its solution strengthening effect in steel, and content is too low, and invigoration effect is too little, and therefore minimum Mn content is0.40%, Mn too high levels easily causes central segregation of slab in casting process, reduces product thickness direction structural homogenity,And affect material welding performance and fatigue behaviour, therefore high Mn content is 0.60%.
Si:Si plays solution strengthening effect in steel, and content is too low, and invigoration effect is too little, and minimum Si content is 0.25%, SiToo high levels, easily forms Fe2SiO4 at product surface, causes blemish, and the fatigue behaviour of product is produced to unfavorable shadowRing, therefore high Si content is 0.37%.
P:P is the impurity element in steel, is easy at Grain Boundary Segregation, affects the toughness of product, and therefore its content is more low better.According to working control level, should be controlled at below 0.015%.
S:S is the impurity element in steel, easily produces segregation at crystal boundary, reduces the toughness of steel, when steel-making, should fully remove,To with laser weld steel for saw blade substrate, should ensure that its value is lower than 0.005%.
N:N is the impurity element in steel, reduces the toughness of steel, be easy to Al, Ti and form AlN and TiN, and too high levels, easilyForm thick TiN, therefore reduce its content as far as possible, for laser weld steel for saw blade substrate, its value should be lower than 0.006%.
Cr:Cr can improve the quenching degree of steel, is conducive to improve hardness and the wearability of steel, and therefore its minimum is0.80%, but Cr too high levels easily causes steel strength too high, toughness declines, and therefore peak is 1.10%.
Mo:Mo can improve the quenching degree of steel, is combined forms MC carbide with C, improves hardness and the wearability of steel, because ofThis its minimum is 0.15%, but the too high meeting of Mo increases cost greatly, and can reduce the toughness of steel.
Ti:Ti can O and N in steel be combined, and forms TiO and TiN, reduce free O and N in steel crystal particle crystal boundary partiallyPoly-, prevent strand crackle, improve surface quality and the fatigue strength of steel, be combined for abundant O, N in steel, therefore it is minimumContent is 0.005%, but TI too high levels increases cost, and easily forms thick TiN, thereby affects the intensity of steel and toughProperty.
Compared with prior art, steel plate tensile strength is 600 ~ 900MPa in the present invention, and percentage elongation A is 15 ~ 28%, and hardness exists160 ~ 260HB, the fluctuation of steel coil head and middle part tensile strength is less than 150MPa, one side practical decarburized depth be less than steel plate thickness≤1.1%, after quenching, hardness fluctuations is less than 2HRC, the reduced thickness≤100 μ m of limit portion, and unevenness≤12mm/m, product thickness is 1.0 ~3.0mm, product have advantages of that plate shape is good, performance is even, decarburized layer is little, quenching degree and welding performance good, and can portionDivide and realize " with hot Dai Leng ", reduce costs.
Detailed description of the invention
Below the present invention is described in detail:
Table 1 is the value list of various embodiments of the present invention and comparative example;
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example;
Table 3 is various embodiments of the present invention and the list of comparative example Performance Detection situation.
Various embodiments of the present invention are produced according to following steps:
1) smelt also continuous casting and become base, wherein: control and water steel temperature at 1520 ~ 1550 DEG C, slab thickness is at 50 ~ 60mm;
2) strand is heated: control strand charging temperature at 900 ~ 1100 DEG C, tapping temperature, at 1130 DEG C ~ 1250 DEG C, is castBase time inside furnace 10 ~ 40min, air-fuel ratio≤1.4 in stove;
3) be rolled: rolling pass is 7 passages; Control finishing temperature at 880 ~ 920 DEG C; Control front two percentage pass reductions50% ~ 70%, control last two percentage pass reductions 5% ~ 20%;
4) carry out laminar flow cooling: take front segmentation cooling, cooling velocity is not less than 15 DEG C/s; At head and the afterbody of coil of strip5 ~ 15m scope is not carried out water-cooled;
5) batch, coiling temperature is controlled at 620 DEG C ~ 700 DEG C;
6) coil of strip in storehouse or in stay-warm case slow cooling to room temperature;
7) carry out finishing.
The chemical composition list (wt%) of table 1 embodiment of the present invention and comparative example
Specification in table 1 and composition are not corresponding relation.
Table 2 various embodiments of the present invention and comparative example technique major parameter control list
The main technologic parameters list (two) of table 2 various embodiments of the present invention and comparative example
Table 3 is various embodiments of the present invention and the list of comparative example Performance Detection situation
As can be seen from Table 3, the present invention is especially for the substrate of the following thickness of 2.0mm, and its tensile strength is also at 600MPaAbove, percentage elongation A is more than 15%, and hardness is more than 160HB, and steel coil head and the fluctuation of middle part tensile strength are less than 130MPa, singleFace practical decarburized depth is less than steel plate thickness≤1.1%, and after quenching, hardness fluctuations is less than 2HRC, the reduced thickness≤90 μ m of limit portion, noPingdu≤12mm. Meet the requirement in market completely.
Above-described embodiment only exemplifies for the best, and is not the restriction to embodiments of the present invention.
Claims (3)
1. the method for the ultra-thin laser weld steel for saw blade substrate of production hot rolling, its step:
1) smelting into component and weight percent content is: C:0.26% ~ 0.34%, and Si:0.25% ~ 0.37%, Mn:0.40% ~0.60%，P：≤0.015%，S：≤0.005%，N：≤0.006%，Cr：0.80~1.10%，Mo：0.15~0.25%，Ti：0.005%Or 0.025 ~ 0.045%, all the other are the ultra-thin laser weld steel for saw blade substrate of the hot rolling water of Fe and inevitable impurity, and connectCast base, wherein: control and water steel temperature at 1520 ~ 1550 DEG C, slab thickness is at 50 ~ 60mm;
2) strand is heated: control strand charging temperature at 900 ~ 1100 DEG C, tapping temperature is at 1130 DEG C ~ 1250 DEG C, and strand existsStove time 10 ~ 40min, air-fuel ratio≤1.4 in stove;
3) be rolled: rolling pass is 7 passages; Control finishing temperature at 880 ~ 920 DEG C; Controlling front two percentage pass reductions exists50% ~ 70%, control last two percentage pass reductions 5% ~ 20%;
4) carry out laminar flow cooling: take front segmentation cooling, cooling velocity is not less than 15 DEG C/s; The head of coil of strip and afterbody 5 ~15m scope is not carried out water-cooled;
5) batch, coiling temperature is controlled at 642 DEG C ~ 670 DEG C;
6) coil of strip in storehouse or in stay-warm case slow cooling to room temperature;
7) carry out finishing.
2. the method for the ultra-thin laser weld steel for saw blade substrate of production hot rolling as claimed in claim 1, is characterized in that: strandThickness is at 50 ~ 56mm.
3. the method for the ultra-thin laser weld steel for saw blade substrate of production hot rolling as claimed in claim 1, is characterized in that: strandTapping temperature is at 1130 DEG C ~ 1200 DEG C.
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| CN104438326B (en) * | 2014-10-17 | 2017-04-12 | 武汉钢铁(集团)公司 | Rolling technology for high-carbon steel in thin slab casting and rolling |
| CN104962812B (en) * | 2015-07-16 | 2017-03-08 | 武汉钢铁(集团)公司 | Hot continuous rolling axle housing steel and its manufacture method with good profile |
| CN106756511B (en) * | 2017-01-10 | 2018-04-17 | 湖南华菱涟源钢铁有限公司 | A kind of bimetal saw blade backing D6A broad hot strips and its production method |
| KR102452599B1 (en) * | 2017-09-20 | 2022-10-07 | 바오스틸 잔장 아이론 앤드 스틸 컴퍼니 리미티드 | Production method to improve the precipitation strengthening effect of Ti microalloyed hot-rolled high-strength steel in-line |
| KR20200066630A (en) * | 2017-09-20 | 2020-06-10 | 바오스틸 잔장 아이론 앤드 스틸 컴퍼니 리미티드 | Hot rolling online mobile heat insulation heat treatment process, and heat treatment line |
| CN114645190B (en) * | 2022-02-09 | 2023-05-26 | 包头钢铁（集团）有限责任公司 | ASTM4130 steel and production method thereof |
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| JPH0724632A (en) * | 1993-07-07 | 1995-01-27 | Sumitomo Metal Ind Ltd | Manufacture of circular saw blade |
| JP3440960B2 (en) * | 1995-02-17 | 2003-08-25 | 日新製鋼株式会社 | Steel plate for metal saw substrate excellent in weldability and method for producing the same |
| CN101613831B (en) * | 2008-06-27 | 2011-05-11 | 宝山钢铁股份有限公司 | Non-hardened and non-tempered high-hardness hot rolled steel, manufacturing method thereof and application thereof |
| CN101497972B (en) * | 2009-03-13 | 2011-03-23 | 武汉钢铁(集团)公司 | High strength low yield ratio welding structure steel and production method thereof |
| CN101773929B (en) * | 2010-01-20 | 2011-10-05 | 广州珠江钢铁有限责任公司 | Method for producing 30CrMo hot rolled steel plate |
| CN101967606A (en) * | 2010-11-02 | 2011-02-09 | 武汉钢铁(集团)公司 | Hot rolled steel strip for straight slit electric resistance welding petroleum casing pipe and production method thereof |
| CN102345071B (en) * | 2011-07-08 | 2013-07-17 | 南阳汉冶特钢有限公司 | Steel plate of alloy structural steel 30CrMo added with B and its production method |
| CN102345074A (en) * | 2011-10-19 | 2012-02-08 | 武汉钢铁(集团)公司 | Intermediate-carbon high-speed cutting saw blade matrix steel and production method thereof |
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