CN104087839A - Steel for hot-rolling ultra-thin laser welding saw blade base and production method - Google Patents

Steel for hot-rolling ultra-thin laser welding saw blade base and production method Download PDF

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Publication number
CN104087839A
CN104087839A CN201410343544.8A CN201410343544A CN104087839A CN 104087839 A CN104087839 A CN 104087839A CN 201410343544 A CN201410343544 A CN 201410343544A CN 104087839 A CN104087839 A CN 104087839A
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steel
saw blade
laser welding
ultra
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CN104087839B (en
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谭文
韩斌
张超
蔡珍
魏兵
黄全伟
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Group Corp
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Abstract

The invention discloses steel for hot-rolling an ultra-thin laser welding saw blade base. The steel comprises the following components in percentage by weight: 0.26-0.34% of C, 0.25-0.37% of Si, 0.40-0.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, less than or equal to 0.006% of N, 0.80-1.10% of Cr, 0.15-0.25% of Mo and 0.005-0.045% of Ti. Production comprises the following steps: smelting and continuously casting to prepare a blank, heating a cast blank, rolling, performing laminar cooling, coiling, slowly cooling a steel roll in a warehouse or insulating hood to be the room temperature, and finely settling. The tension strength of a steel plate is 600-900MPa, the ductility A is 15-28%, the hardness is 160-260HB, the tensile strength fluctuation between the head part and the middle part of the steel roll is smaller than 150MPa, the thickness of a single side decarburized layer is less than or equal to 1.1% of the thickness of the steel plate, the hardness fluctuation after quenching is less than 2HRC, the thickness reduction of an edge part is less than or equal to 100mu m, the unflatness is less than or equal to 12mm/m, the thickness of a product is 1.0-3.0mm, the effect of replacing cold rolling by hot rolling can be partially achieved, and the cost is lowered.

Description

The ultra-thin laser welding steel for saw blade substrate of hot rolling and production method
Technical field
The present invention relates to a kind of hot rolled strip and production method, belong to particularly the ultra-thin laser welding steel for saw blade substrate of a kind of hot rolling and production method.
Background technology
Laser welding steel for saw blade substrate need to have good welding property, hardenability, toughness and suitable intensity etc. preferably.Laser welding steel for saw blade substrate often adopts hot rolling technology to produce at present, is mainly divided into old process and bar strip continuous casting and rolling flow path, and 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, the problem such as have that Decarburized layer is serious, composition is uneven, banded structure is serious and plate shape is poor, needs the extra more transition material that increases while producing thin slab product.When adopting sheet billet continuously casting and rolling to produce thin specification steel saw blade, also exist plate shape poor, especially after large, the finished product aligning of the edge thinning of strip roughness conventionally more than 12mm, even if the multi-pass straightening process by rear operation is also difficult to reach good plate shape, hardness is higher and mechanical property fluctuates larger especially end to end, conventionally more than 150MPa, cause user to process and use difficulty, even cannot use.
Through retrieval, China Patent Publication No. is the patent documentation of CN 101773929A, it discloses a kind of method that CSP is produced 30CrMo steel, its composition and production technique 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 inevitable impurity, main production is: strand liquid core is depressed 5 ~ 15mm, 30 ~ 40 ℃ of molten steel overheats, 950 ~ 1050 ℃ of strand charging temperatures, 830 ~ 930 ℃ of finishing temperatures, coiling temperature is 520 ~ 620 ℃.It is the production method of the above steel of 2.5mm that the document has been mainly concerned with thickness.Its deficiency: in alloying constituent, there is no to add the alloying element Ti that residual O and N are combined in steel, the O that these are free and N meeting segregation are at crystal boundary, cause toughness of material and fatigue property to reduce, because laser welding saw bit matrix is for a long time 100 ~ 300 ℃ of work, therefore under this composition, the fatigue property of product is lower, work-ing life is shorter, also easily there is limit portion crackle in the segregation due to N in casting process in addition, the too low meeting of finishing temperature and coiling temperature causes the plate shape of material as poor in roughness, intensity is higher, toughness drop, especially for thin specification saw blade, the too low material that causes of temperature is uneven, and be 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 in steel, has added the method that B produces thick specification 30CrMo steel plate.It discloses a kind of method of the 30CrMo of production steel, its composition and production technique are: C:0.28% ~ 0.33%, 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 are Fe and inevitable impurity, adopt conventional hot continuous rolling machine explained hereafter, main production is: Heating temperature≤1300 ℃, 1050 ~ 1150 ℃ of one-phase start rolling temperatures, two-stage open rolling≤950 ℃, 840 ~ 940 ℃ of finishing temperatures, after finish to gauge, enter burial pit cooling, slow cooling temperature >=400 ℃, slow cooling time >=36 hour.The document will relate to the production method of thickness 50mm, 100mm steel.Its deficiency: its product exists equally owing to not adding alloying element Ti etc., is easy to cause sheet billet continuous casting process slab crackle and reduces fatigue property.The B adding in its steel in addition is also easy to cause the quality problems such as slab limit portion crackle, but it is mainly for compared with thick steel plates, and coiling temperature can not controlled, and therefore do not have the problems such as plate shape is bad, but this technique can not be for the production of thin 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, unit 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 finished steel plate thickness≤1.1%, after quenching, hardness fluctuations is less than 2HRC, reduced thickness≤100 μ the m of limit portion, roughness≤12mm/m, the ultra-thin laser welding steel for saw blade substrate of hot rolling and production method that product thickness is 1.0 ~ 3.0mm.
The present invention, by controlling the low carbon content in molten steel, has alleviated the component segregation of original strand and the banded structure of finished product on the one hand, has improved on the other hand the welding property of steel.By the control of the elements such as low Mn, P, S, further reduced the defects such as segregation of original strand, improve slab quality.By add appropriate Ti element in molten steel, can effectively solidify the N element in molten steel on the one hand, reduce strand because the higher strip edge causing of free nitrogen splits defect, can improve on the other hand the thermostability of steel.
By taking to improve strand charging temperature at 900 ~ 1100 ℃, 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.In the operation of rolling, adopt to increase upstream two frames and be F1 and F2 percentage pass reduction 50% ~ 70%, last two passage F6 and F7 percentage pass reduction adopt and gently depress 5% ~ 20%, are preferably no more than 10%, can further improve the plate shape of steel, especially alleviate the limit portion reduced thickness of steel; And due to the raising of rolling temperature, reduced because upstream frame draught increases the load causing and increased.Each,, 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 end to end in employing.Can there is sufficient ferrite-pearlite phase transformation in higher coiling temperature in addition, avoids the bainitic transformation in steel, reduces intensity and the hardness of steel, is conducive to the aligning of rear operation, further reduces the roughness of steel and the plate shape of raising steel.
Realize the technical measures of above-mentioned purpose:
The ultra-thin laser welding 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 welding 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 ℃, slab thickness is at 50 ~ 60mm;
2) strand is heated: control strand charging temperature at 900 ~ 1100 ℃, tapping temperature is at 1130 ℃ ~ 1250 ℃, strand 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 ℃; Control front two percentage pass reductions 50% ~ 70%, control last two percentage pass reductions 5% ~ 20%;
4) carry out laminar flow cooling: take front segmentation cooling, speed of cooling is not less than 15 ℃/s; Head and afterbody 5 ~ 15m scope at coil of strip are not carried out water-cooled;
5) batch, coiling temperature is controlled at 620 ℃ ~ 700 ℃;
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 ℃ ~ 1200 ℃.
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, its strengthening effect is just enough obvious, but the too high welding property that affects of carbon content, especially for laser welding steel for saw blade substrate, carbon content is too high brings product center segregation, greatly reduce the welding property of product, therefore carbon content is the highest is no more than 0.34%, and preferably, C content is chosen as 0.26% ~ 0.31%.
Mn:Mn is its solution strengthening effect in steel, content is too low, strengthening effect is too little, therefore minimum Mn content is 0.40%, Mn too high levels easily causes central segregation of slab in casting process, reduce product thickness direction homogeneity of structure, and affect material welding property and fatigue property, therefore high Mn content is 0.60%.
Si:Si plays solution strengthening effect in steel, and content is too low, and strengthening effect is too little, minimum Si content is 0.25%, Si too high levels, easily at product surface, forms Fe2SiO4, cause surface imperfection, and the fatigue property of product is had a negative impact, 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, so 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 at crystal boundary, produces segregation, reduces the toughness of steel, during steel-making, should fully remove, to laser welding steel for saw blade substrate, should guarantee that its value is lower than 0.005%.
N:N is the impurity element in steel, reduces the toughness of steel, is easy to Al, Ti and forms AlN and TiN, and too high levels, easily forms thick TiN, therefore reduces its content as far as possible, and for laser welding steel for saw blade substrate, its value should be lower than 0.006%.
Cr:Cr can improve the hardening capacity of steel, is conducive to improve hardness and the wear resistance of steel, so its Schwellenwert is 0.80%, but Cr too high levels easily causes steel strength too high, and toughness declines, so maximum is 1.10%.
Mo:Mo can improve the hardening capacity of steel, is combined forms MC carbide with C, improves hardness and the wear resistance of steel, so its Schwellenwert 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, form TiO and TiN, in minimizing steel, free O and N are in the segregation of crystal particle crystal boundary, prevent strand crackle, improve surface quality and the fatigue strength of steel, for abundant O, N in steel is combined, therefore its minimum content is 0.005%, but TI too high levels increases cost, and easily forms thick TiN, thereby affects intensity and the toughness of steel.
The present invention compared with prior art, steel plate tensile strength is 600 ~ 900MPa, unit elongation A is 15 ~ 28%, hardness is at 160 ~ 260HB, steel coil head and the fluctuation of middle part tensile strength are less than 150MPa, one side practical decarburized depth is less than steel plate thickness≤1.1%, after quenching, hardness fluctuations is less than 2HRC, reduced thickness≤100 μ the m of limit portion, roughness≤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, hardening capacity and welding property good, and can partly realize " with hot Dai Leng ", reduce costs.
Embodiment
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 ℃, slab thickness is at 50 ~ 60mm;
2) strand is heated: control strand charging temperature at 900 ~ 1100 ℃, tapping temperature is at 1130 ℃ ~ 1250 ℃, strand 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 ℃; Control front two percentage pass reductions 50% ~ 70%, control last two percentage pass reductions 5% ~ 20%;
4) carry out laminar flow cooling: take front segmentation cooling, speed of cooling is not less than 15 ℃/s; Head and afterbody 5 ~ 15m scope at coil of strip are not carried out water-cooled;
5) batch, coiling temperature is controlled at 620 ℃ ~ 700 ℃;
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 significant parameter are controlled 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, its tensile strength is also more than 600MPa, unit 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, one side practical decarburized depth is less than steel plate thickness≤1.1%, after quenching, hardness fluctuations is less than 2HRC, the reduced thickness≤90 μ m of limit portion, roughness≤12mm.Met 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 (7)

1. the ultra-thin laser welding 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.
2. the ultra-thin laser welding steel for saw blade substrate of hot rolling as claimed in claim 1, is characterized in that: C weight percent content is: 0.26% ~ 0.31%.
3. the method for the ultra-thin laser welding steel for saw blade substrate of hot rolling described in production claim 1, its step:
1) smelt also continuous casting and become base, wherein: control and water steel temperature at 1520 ~ 1550 ℃, slab thickness is at 50 ~ 60mm;
2) strand is heated: control strand charging temperature at 900 ~ 1100 ℃, tapping temperature is at 1130 ℃ ~ 1250 ℃, strand 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 ℃; Control front two percentage pass reductions 50% ~ 70%, control last two percentage pass reductions 5% ~ 20%;
4) carry out laminar flow cooling: take front segmentation cooling, speed of cooling is not less than 15 ℃/s; Head and afterbody 5 ~ 15m scope at coil of strip are not carried out water-cooled;
5) batch, coiling temperature is controlled at 620 ℃ ~ 700 ℃;
6) coil of strip in storehouse or in stay-warm case slow cooling to room temperature;
7) carry out finishing.
4. the method for the ultra-thin laser welding steel for saw blade substrate of production hot rolling as claimed in claim 3, is characterized in that: slab thickness is at 50 ~ 56mm.
5. the method for the ultra-thin laser welding steel for saw blade substrate of production hot rolling as claimed in claim 3, is characterized in that: in finishing stands, F6, F7 percentage pass reduction are no more than 10%.
6. the method for the ultra-thin laser welding steel for saw blade substrate of production hot rolling as claimed in claim 3, is characterized in that: the cooling employing of front segmentation is interrupted opening ways and carries out cooling.
7. the method for the ultra-thin laser welding steel for saw blade substrate of production hot rolling as claimed in claim 3, is characterized in that: strand tapping temperature is at 1130 ℃ ~ 1200 ℃.
CN201410343544.8A 2014-07-18 2014-07-18 The ultra-thin laser weld steel for saw blade substrate of hot rolling and production method Expired - Fee Related CN104087839B (en)

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
CN104438326A (en) * 2014-10-17 2015-03-25 武汉钢铁(集团)公司 Rolling technology for high-carbon steel in thin slab casting and rolling
CN104962812A (en) * 2015-07-16 2015-10-07 武汉钢铁(集团)公司 Hot-continuous-rolled axle housing steel with favorable plate shape and manufacturing method thereof
CN106756511A (en) * 2017-01-10 2017-05-31 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
WO2019057115A1 (en) * 2017-09-20 2019-03-28 宝钢湛江钢铁有限公司 Production method for inline increase in precipitation toughening effect of ti microalloyed hot-rolled high-strength steel
EP3685931A4 (en) * 2017-09-20 2021-08-11 Baosteel Zhanjiang Iron & Steel Co., Ltd. Hot-rolling online movable thermal insulation heat treatment process, and heat treatment line

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JPH08225886A (en) * 1995-02-17 1996-09-03 Nisshin Steel Co Ltd Steel sheet for metal slitting saw substrate excellent in weldability and its production
CN101497972A (en) * 2009-03-13 2009-08-05 武汉钢铁(集团)公司 High strength low yield ratio welding structure steel and production method thereof
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CN101773929A (en) * 2010-01-20 2010-07-14 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
CN102345071A (en) * 2011-07-08 2012-02-08 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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Publication number Priority date Publication date Assignee Title
JPH0724632A (en) * 1993-07-07 1995-01-27 Sumitomo Metal Ind Ltd Manufacture of circular saw blade
JPH08225886A (en) * 1995-02-17 1996-09-03 Nisshin Steel Co Ltd Steel sheet for metal slitting saw substrate excellent in weldability and its production
CN101613831A (en) * 2008-06-27 2009-12-30 宝山钢铁股份有限公司 Non-modified high-hardness hot rolled steel and manufacture method and application
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104438326A (en) * 2014-10-17 2015-03-25 武汉钢铁(集团)公司 Rolling technology for high-carbon steel in thin slab casting and rolling
CN104962812A (en) * 2015-07-16 2015-10-07 武汉钢铁(集团)公司 Hot-continuous-rolled axle housing steel with favorable plate shape and manufacturing method thereof
CN106756511A (en) * 2017-01-10 2017-05-31 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
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
WO2019057115A1 (en) * 2017-09-20 2019-03-28 宝钢湛江钢铁有限公司 Production method for inline increase in precipitation toughening effect of ti microalloyed hot-rolled high-strength steel
EP3686292A4 (en) * 2017-09-20 2020-11-11 Baosteel Zhanjiang Iron & Steel Co., Ltd. Production method for inline increase in precipitation toughening effect of ti microalloyed hot-rolled high-strength steel
EP3685931A4 (en) * 2017-09-20 2021-08-11 Baosteel Zhanjiang Iron & Steel Co., Ltd. Hot-rolling online movable thermal insulation heat treatment process, and heat treatment line
US11384406B2 (en) 2017-09-20 2022-07-12 Baosteel Zhanjian Iron & Steel Co., Ltd. Production method for inline increase in precipitation toughening effect of Ti microalloyed hot-rolled high-strength steel

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