CN105063492B - Hot-strip of automobile friction and preparation method thereof - Google Patents

Hot-strip of automobile friction and preparation method thereof Download PDF

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CN105063492B
CN105063492B CN201510495646.6A CN201510495646A CN105063492B CN 105063492 B CN105063492 B CN 105063492B CN 201510495646 A CN201510495646 A CN 201510495646A CN 105063492 B CN105063492 B CN 105063492B
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control
strip
hot
steel
strand
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CN105063492A (en
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谭文
韩斌
蔡珍
汪水泽
甘小龙
孙宜强
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Co Ltd
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Abstract

The invention discloses a kind of hot-strip of automobile friction, chemical composition and mass percent are in steel:C:0.45~0.75%, Si:0.10~0.30%, Mn:0.60~1.20%, P≤0.015%, S≤0.005%, N≤0.006%, Cr:0.05~0.50%, Als:0.015~0.050%, Ti≤0.005%, V:0.01~0.03%, remaining is Fe and inevitable impurity.The invention also discloses the preparation method of the hot-strip of this automobile friction.The hardness of hot-strip of the present invention is controlled in 18~25HRC, and after 600~850 DEG C of annealing temperatures, the hardness of steel stills remain in 14~18HRC, and with good cold-formed performance, during punching shaping, steel do not ftracture.

Description

Hot-strip of automobile friction and preparation method thereof
Technical field
The present invention relates to hot-strip manufacturing technology, hot-strip and its preparation side in particular to a kind of automobile friction Method.
Background technology
Automobile friction is the important spare part of automobile brake system, is one of automobile easily worn part.Existing manufacturing procedure Including punching steel disc, relatively flat, mill, one layer of cupric friction material is then sintered on the base steel ground and is made.Automobile friction Working environment and processing technology require that base steel has good hardenability, wearability, higher intensity etc., especially require that base steel is passed through Crossing after 600~800 DEG C of sintering still has 14~18HRC hardness.In addition, automobile friction to the thickness and precision of steel band and Surface requirements are also higher, and thickness and precision requirement reaches ± 0.03mm, and surface roughness requirements are less than 0.3um.In order to meet this It is required that, base steel material used in current automobile friction generally uses cold rolling 40Mn, 50Mn or 65Mn steel band.Although cold-rolled strip can Meet requirement of the friction plate to thickness and precision and surface, but it is sintered after, its hardness is less than 14HRC, is unsatisfactory for existing process It is required that, and the cost of cold-rolled strip is higher.Based on this, at present in the urgent need to one kind meets the requirement of existing processing technology and cost compared with Low material.After current also paid pilot production is annealed with hot rolling 65Mn material substitution cold rolling materials, but hot-finished material through oversintering its Hardness decline is larger and uneven, is unsatisfactory for existing process requirement.
Authorization Notice No. discloses a kind of side for producing 65Mn hot rolled steel plates for CN101773930B Chinese invention patent Method, the chemical composition of molten steel that refining process carries out after Alloying Treatment is:C:0.62~0.70%, Si:0.17~0.37%, Mn:0.90~1.20%, P≤0.035%, S≤0.035%, Cr≤0.25%, Ni≤0.25%, remaining is Fe and can not kept away The impurity exempted from;Describe a kind of method that use bar strip continuous casting and rolling flow path produces 65Mn hot rolled steel plates, hot-rolled product it is hard Spend for 19~30HRC.But because, without stable and resistant to elevated temperatures carbide, material is after high annealing, its product hardness in steel Decline is larger and uneven, is unsatisfactory for existing process requirement.If the hardness before existing hot rolled steel plate is annealed further is improved To more than 30HRC, then the easy phenomenon such as cracking in punching course.In addition, the roughness Ra of hot-strip is in 1.0um More than, it is unsatisfactory for existing process and requires that steel substrate surface roughness is less than 0.30um requirement.
Therefore it provides a kind of financial cost is low, annealed through oversintering after, product hardness decline it is smaller, with good cold Hot-strip of automobile friction of forming ability and preparation method thereof seems very necessary.
The content of the invention
It is an object of the invention to the weak point for overcoming above-mentioned existing background technology, there is provided a kind of heat of automobile friction Steel rolling material and preparation method thereof.
The purpose of the present invention is reached by following measure:It is chemical in a kind of hot-strip of automobile friction, steel Composition and mass percent are:C:0.45~0.75%, Si:0.10~0.30%, Mn:0.60~1.20%, P≤0.015%, S≤0.005%, N≤0.006%, Cr:0.05~0.50%, Als:0.015~0.050%, Ti≤0.005%, V:0.01~ 0.03%, remaining is Fe and inevitable impurity;The hardness of hot-rolled product is controlled in 18~25HRC, through 600~850 DEG C After annealing temperature, the hardness of steel stills remain in 14~18HRC.
Preferably, chemical composition and mass percent are in steel:C:0.66~0.75%, Si:0.20~0.30%, Mn: 0.90~1.20%, P≤0.007%, S≤0.005%, N≤0.006%, Cr:0.05~0.30%, Als:0.015~ 0.030%, Ti≤0.003%, V:0.01~0.025%, remaining is Fe and inevitable impurity.
Further, chemical composition and mass percent are in steel:C:0.68%, Si:0.20%, Mn:1.10%, P: 0.007%, S:0.005%, N:0.003%, Cr:0.05%, Als:0.015%, Ti:0.002%, V:0.025%, remaining is Fe and inevitable impurity.
The effect of the main chemical elements and its percentage composition that the present invention is selected in the present invention is as follows:
C:Carbon mainly plays solution strengthening effect in steel, improves the hardness and hardenability of steel, and carbon content is too low, at heat Hardness is too low after reason, and steel is too soft.Carbon content is too high, and steel hardness is too high, the problems such as process is easily cracking, processing Poor-performing.Therefore carbon content is 0.45~0.75%, it is preferable that C content selection is 0.66%~0.75%.
Si:Si plays solution strengthening effect in steel, and content is too low, and invigoration effect is too small, and minimum Si contents are 0.10%, Si Too high levels, easily in product surface formation Fe2SiO4, surface defect is caused, therefore most high Si content is 0.30%.
Mn:Mn plays solution strengthening effect in steel, improves the hardness and quenching degree of steel, and Mn contents are too low, invigoration effect It is too small, therefore minimum Mn contents are that 0.60%, Mn too high levels easily cause central segregation of slab in casting process, reduce material The performance of material, therefore most high Mn content is 1.20%.
P:P is the impurity element in steel, it is easy in Grain Boundary Segregation, influence the toughness of product, therefore its content is more low better. According to actual controlled level, it should control below 0.015%.
S:S is the impurity element in steel, easily produces segregation in crystal boundary, reduces the toughness of steel, should fully be removed during steel-making, It should ensure that its value is less than 0.005%.
N:N is the impurity element in steel, reduces the toughness of steel, it is easy to Al, Ti formation AlN and TiN, too high levels, easily Thick TiN is formed, therefore reduces its content as far as possible, its value should be less than 0.006%.
Cr:Cr can improve the quenching degree of steel, be conducive to improving the hardness and wearability of steel, Stable Carbon is formed in steel Compound, in tempering and annealing process, it is 0.05% to play a part of minimum in stable steel hardness, the present invention, but Cr contains Amount is too high to easily cause steel excessive high hardness, and toughness declines, therefore peak is 0.50%.
V:V can improve the quenching degree of steel, combine to form stable MC carbide with C, improve the hardness and wearability of steel, In tempering and annealing process, play a part of stable steel performance, therefore its minimum content is 0.01%, it is considered to cost because Element, highest V content is 0.03%.
Ti:Ti is easily combined with the N in steel, forms thick TiN, produces strand crackle, reduces product quality, therefore, steel Middle Ti should be controlled in reduced levels, and present invention control is below 0.005%.
Al:Al is combined in steel with O, primarily serves the effect of deoxidation, therefore minimum content is 0.015%, Al content mistake The high continuous casting that easily formed is difficult, therefore highest content is 0.050%.
Steel of the present invention is in addition to containing above-mentioned chemical composition, and remaining is Fe and inevitable impurity.
The preparation method of the hot-strip of above-mentioned automobile friction, comprises the following steps:
1) smelting, refining, application of vacuum and continuous casting:During continuous-casting steel pouring, the degree of superheat control of molten steel is 15~25 DEG C, continuous casting Base thickness control is 50~90mm;
2) heat:Heating stepses 1) obtained by strand, strand charging temperature control be 900~1100 DEG C, tapping temperature control 1150~1250 DEG C are made as, the control of strand time inside furnace is 20~50min;
3) controlled rolling:To step 2) in the strand of gained carry out roughing and finish rolling, the first passage of finish rolling, the second passage and the The reduction ratio of three passages is controlled 30~50%, finish rolling end percentage pass reduction≤15%, and finishing temperature control is 860~900 DEG C;
4) control cold:To step 3) in the steel plate of gained carry out control cold treatment, using section cooling, cooldown rate control is 3 ~35 DEG C/s;
5) batch:To step 4) in the steel plate of gained carry out batching processing, oiler temperature control is 620~660 DEG C;
6) slow cooling:To step 5) in gained coil of strip carry out slow cooling processing, temperature retention time control be 24~72h;
7) pickling:To step 6) in gained coil of strip carry out pickling;
8) smooth and oiling:To step 7) in the coil of strip of gained carry out smooth processing, smooth elongation control is 1~5%, Leveling roll roughness Ra≤0.8um, that is, obtain the hot-strip of automobile friction.
Preferably, step 1) in, the degree of superheat control of molten steel is 15~20 DEG C, and thickness of strand control is 50~70mm.
Further, step 2) in, the control of strand time inside furnace is 25~30min.
Yet further, step 3) in, finishing temperature control is 860~880 DEG C.
Yet further, step 4) in, cooldown rate control is 10~25 DEG C/s.
Further, step 5) in, oiler temperature control is 620~640 DEG C.
Again further, step 8) in, smooth elongation percentage is by 1.5%~4.0% control.
The advantage of the invention is that:
First, by controlling chemical composition and hot rolling technology in steel, laminar flow cooling technology, coiling temperature etc. so that Stable carbide is formed in steel, the hardness of hot-strip is controlled in 18~25HRC, and with good cold-formed property Can, after 600~850 DEG C of annealing temperature, the hardness of steel stills remain in 14~18HRC, meets existing automotive friction The fabrication process condition of piece;
Second, the present invention is during punching shaping, steel do not ftracture, and substantially increase the lumber recovery and performance of steel.
Embodiment
Describe the performance of the present invention in detail with reference to embodiment, but they do not constitute limitation of the invention, It is only for example.Simultaneously by illustrating that advantages of the present invention will become clearer and be readily appreciated that.
Table 1 is chemical composition and percentage by weight in the hot-strip that embodiment 1~6 is automobile friction, comparative example 1~ 3 be chemical composition and percentage by weight in comparative steel, and remaining is Fe and inevitable impurity.
The chemical composition and percentage by weight (wt%) of the various embodiments of the present invention of table 1 and comparative example
By the chemical composition through smelting, refining, the heated slab that obtains after application of vacuum and continuous casting, controlled rolling, control it is cold, Batch, slow cooling, pickling and it is smooth after obtain the hot-strip of automobile friction.Specific main technologic parameters such as following table:
The main technologic parameters list (one) of the various embodiments of the present invention of table 2
The main technologic parameters list (two) of the various embodiments of the present invention of table 3
Above-described embodiment performance parameter is as shown in the table:
The results of property list of the various embodiments of the present invention of table 4 and comparative example
As can be seen from Table 4:The product rigidity of the embodiment of the present invention 1~6 can be good, the control of the hardness of hot-strip 18~ 25HRC, steel performance is good after sintering annealing, and after the sintering annealing of 600~850 DEG C of temperature, the hardness of steel is remained in that In 14~18HRC, during punching shaping, hot-strip does not ftracture.
Other parts not being described in detail are prior art.

Claims (10)

1. a kind of hot-strip of automobile friction, it is characterised in that:Chemical composition and mass percent are in steel:C:0.45~ 0.75%, Si:0.10~0.30%, Mn:0.60~1.20%, P≤0.015%, S≤0.005%, N≤0.006%, Cr: 0.05~0.50%, Als:0.015~0.050%, Ti≤0.005%, 0.01%≤V < 0.03%, remaining is Fe and can not The impurity avoided;The hardness of hot-rolled product is controlled in 18~25HRC, after 600~850 DEG C of annealing temperature, the hardness of steel Still remain in 14~18HRC;
Its preparation method, comprises the following steps:
1) smelting, refining, application of vacuum and continuous casting:During continuous-casting steel pouring, the degree of superheat control of molten steel is 15~25 DEG C, and continuous casting billet is thick Degree control is 50~90mm;
2) heat:Heating stepses 1) obtained by strand, strand charging temperature control be 900~1100 DEG C, tapping temperature control be 1150~1250 DEG C, the control of strand time inside furnace is 20~50min;
3) controlled rolling:To step 2) in the strand of gained carry out roughing and finish rolling, the first passage, the second passage and the 3rd road of finish rolling Secondary reduction ratio is controlled 30~50%, finish rolling end percentage pass reduction≤15%, and finishing temperature control is 860~900 DEG C;
4) control cold:To step 3) in the steel plate of gained carry out control cold treatment, using section cooling, cooldown rate control is 3~35 ℃/s;
5) batch:To step 4) in the steel plate of gained carry out batching processing, oiler temperature control is 620~660 DEG C;
6) slow cooling:To step 5) in gained coil of strip carry out slow cooling processing, temperature retention time control be 24~72h;
7) pickling:To step 6) in gained coil of strip carry out pickling;
8) smooth and oiling:To step 7) in the coil of strip of gained carry out smooth processing, smooth elongation control is 1~5%, smooth Roller roughness Ra≤0.8um, that is, obtain the hot-strip of automobile friction.
2. the hot-strip of automobile friction according to claim 1, it is characterised in that:Chemical composition and quality hundred in steel Point ratio is:C:0.66~0.75%, Si:0.20~0.30%, Mn:0.90~1.20%, P≤0.007%, S≤0.005%, N ≤ 0.006%, Cr:0.05~0.30%, Als:0.015~0.030%, Ti≤0.003%, V:0.01~0.025%, remaining For Fe and inevitable impurity.
3. the hot-strip of automobile friction according to claim 1, it is characterised in that:Chemical composition and quality hundred in steel Point ratio is:C:0.68%, Si:0.20%, Mn:1.10%, P:0.007%, S:0.005%, N:0.003%, Cr:0.05%, Als:0.015%, Ti:0.002%, V:0.025%, remaining is Fe and inevitable impurity.
4. a kind of preparation method of the hot-strip of the automobile friction described in claim 1, it is characterised in that:Including following step Suddenly:
1) smelting, refining, application of vacuum and continuous casting:During continuous-casting steel pouring, the degree of superheat control of molten steel is 15~25 DEG C, and continuous casting billet is thick Degree control is 50~90mm;
2) heat:Heating stepses 1) obtained by strand, strand charging temperature control be 900~1100 DEG C, tapping temperature control be 1150~1250 DEG C, the control of strand time inside furnace is 20~50min;
3) controlled rolling:To step 2) in the strand of gained carry out roughing and finish rolling, the first passage, the second passage and the 3rd road of finish rolling Secondary reduction ratio is controlled 30~50%, finish rolling end percentage pass reduction≤15%, and finishing temperature control is 860~900 DEG C;
4) control cold:To step 3) in the steel plate of gained carry out control cold treatment, using section cooling, cooldown rate control is 3~35 ℃/s;
5) batch:To step 4) in the steel plate of gained carry out batching processing, oiler temperature control is 620~660 DEG C;
6) slow cooling:To step 5) in gained coil of strip carry out slow cooling processing, temperature retention time control be 24~72h;
7) pickling:To step 6) in gained coil of strip carry out pickling;
8) smooth and oiling:To step 7) in the coil of strip of gained carry out smooth processing, smooth elongation control is 1~5%, smooth Roller roughness Ra≤0.8um, that is, obtain the hot-strip of automobile friction.
5. the preparation method of the hot-strip of automobile friction according to claim 4, it is characterised in that:The step 1) In, the degree of superheat control of molten steel is 15~20 DEG C, and thickness of strand control is 50~70mm.
6. the preparation method of the hot-strip of automobile friction according to claim 4, it is characterised in that:The step 2) In, the control of strand time inside furnace is 25~30min.
7. the preparation method of the hot-strip of automobile friction according to claim 4, it is characterised in that:The step 3) In, finishing temperature control is 860~880 DEG C.
8. the preparation method of the hot-strip of automobile friction according to claim 4, it is characterised in that:The step 4) In, cooldown rate control is 10~25 DEG C/s.
9. the preparation method of the hot-strip of automobile friction according to claim 4, it is characterised in that:The step 5) In, oiler temperature control is 620~640 DEG C.
10. the preparation method of the hot-strip of automobile friction according to claim 4, it is characterised in that:The step 8) in, smooth elongation percentage is by 1.5%~4.0% control.
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CN106591724A (en) * 2016-12-15 2017-04-26 武汉钢铁股份有限公司 Hot-rolled annealed steel plate for cold forming and production method thereof
CN107641758B (en) * 2017-09-18 2019-07-09 武汉钢铁有限公司 The manufacturing method of the excellent alloy tool steel of fatigue behaviour and its hot rolled plate
CN109023115B (en) * 2018-09-29 2020-01-31 武汉钢铁有限公司 hot-rolled template pull sheet steel and manufacturing method thereof
CN110899329B (en) * 2019-10-25 2021-08-20 邯郸钢铁集团有限责任公司 Method for producing brake pad back steel based on CSP continuous casting and rolling production line
CN111172455B (en) * 2019-12-31 2021-07-20 河钢股份有限公司承德分公司 Carbon steel 45Mn hot-rolled pickled plate and production method thereof
CN111088458B (en) * 2019-12-31 2021-08-17 河钢股份有限公司承德分公司 Medium-high carbon steel 65Mn hot-rolled pickled plate and production method thereof
CN111057962B (en) * 2019-12-31 2021-02-26 河钢股份有限公司承德分公司 Medium-high carbon steel 75Cr hot-rolled pickled plate and production method thereof

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