CN103170704B - A kind of special thick middle, high-carbon and the flame cutting technique of steel alloy steel plate - Google Patents
A kind of special thick middle, high-carbon and the flame cutting technique of steel alloy steel plate Download PDFInfo
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Abstract
The invention discloses a kind of special thick middle, high-carbon and the flame cutting technique of steel alloy steel plate, use cart type torch-cutting machine, by controlling band temperature low velocity flame cutting flow process, use first preheat cut afterwards, band temperature low speed cutting and cut after be incubated PROCESS FOR TREATMENT mode, crack during preventing flame cutting, comprehensively improve steel product quality, and technological requirement is specifically proposed with regard to each process procedure.Take technique of the present invention, improve the present situation easily cracked after being cooled to room temperature after using traditional flame cutting medium and high carbon steel, steel alloy, improve special thick middle, high-carbon and the comprehensive quality of steel alloy, ensure batch production acceptable quality level, decrease iron and steel resource waste, reduce commercial production cost, it is possible to produce huge economic and social benefit.It is little that the present invention implements difficulty, and cost is relatively low, and benefit is fine, has popularity use value.
Description
Technical field
The invention belongs to steel plate manufacturing technology field, particularly to a kind of special thick middle, high-carbon and the fire of steel alloy steel plate
Flame cutting technique.
Background technology
Medium and high carbon steel, steel alloy easily crack after flame cutting is cooled to room temperature, and this crackle is owing to heat should
Power add structural stress sum more than this material rupture strength caused by.Use optical microscope, scanning electron microscope and energy spectrum analysis etc.
Method of testing, is analyzed steel plate cutting crackle, and result shows, cutting cracking occurs in steel plate, is mainly being cut by oxygen
During cutting, when being equivalent to that steel is heated to the heating of critical point AC3(sub-eutectoid steel, all ferrites are all changed into Ovshinsky
The temperature of body) more than, with more than V critical cooling rate after insulation, steel are the most quenched by so this process, cut
The face of cutting off there will not be intermediate change process to obtain martensite, bainite, and after this process, the fragility of steel is the most just
Increase, be extremely easily deformed cracking, add that the tissue that hot-rolled thick plank solidifies after cutting is melted again is thick, local organization mistake
Heat, produces the composite factors such as bigger stress concentration and is caused.Along with steel plate thickness and the increase of hardness, cutting edge occurs
Crackle tendency strengthens, therefore special thick middle, high-carbon and steel alloy are (such as: the steel grade of C content >=0.30%: carbon constructional quality steel
35#、45#、50#；Structural alloy steel 40Cr, 50Cr, plastic die steel P20, S45C, S50C) must be prevented from steel plate when cutting
The generation of cutting crackle.CN102528210 A discloses a kind of torch-flame cutting process for super-thick steel plates, it is characterized in that: it uses fire
Flame cutting machine carries out flame cutting to super-thick steel plate；Steel plate to be cut is placed on NC flame cutting machine, steel plate to be cut
Surface and NC flame cutting machine to cut nozzle vertical, cutting nozzle apart from the height of surface of steel plate to be cut is 10～30mm；Set
Cutting speed, preheating time, preheating oxygen pressure, cutting oxygen pressure and propane pressure, cutting speed is with steel plate thickness chi to be cut
Very little increase and reduce, cutting speed is 200～60mm/min, and preheating time is 40s～80s, preheating oxygen pressure be 0.3
～0.6Mpa, cutting oxygen pressure is 1～1.6Mpa, and propane pressure is 0.1～0.16Mpa；With surface of steel plate to be cut
Place at a right angle with side, as playing cutpoint, adjusts and cuts nozzle flame intensity, make the length of secondary flame reach bottom steel plate to be cut,
Rise and preheat at cut point before cutting, after reaching the preheating time set, open cutting oxygen, when slag edgewise edge trickles downwards, to
Nozzle is cut in front movement, when slag is discharged from bottom, accelerates cutting torch translational speed to normal cutting operation.Described super-thick steel plate flame
Cutting technique is a kind of more advanced representative processes of a kind of traditional flame cutting, but described technique has the most scarce
Falling into and be, the steel plate after the cutting of described flame cutting technique is relatively rapider, the most easily due to cooling in being cooled to room temperature process
Crack, defect rate can be caused higher, therefore still need to propose a kind of new flame cutting technique, control whole flame with realization and cut
The flow process cut, accomplishes the end in view.
Summary of the invention
Present invention aim at solving the problems referred to above, it is provided that the flame of a kind of special thick middle, high-carbon and steel alloy steel plate is cut
Cut technique, special thick middle, high-carbon and the steel alloy of 50～300mm can be cut, it is possible to effectively prevent flame cutting process
In crack, improve steel product quality.
The present invention, based on special thick middle, high-carbon and steel alloy flame cutting crackle mechanism of production, proposes to cut traditional flame
Cut the measure that flow process is optimized, the technical scheme is that a kind of special thick middle, high-carbon and the flame cutting of steel alloy steel plate
Technique, use cart type torch-cutting machine, it is characterised in that: first preheat cut afterwards, band temperature low speed cutting and cut after be incubated
PROCESS FOR TREATMENT mode, cracks during preventing flame cutting, comprehensively improves steel product quality.
The described flame cutting flow process that the present invention takes is as follows: cart type torch-cutting machine is placed into be cut special thick
On middle, high-carbon and steel alloy steel plate, cutting parameter is set according to described steel plate thickness value, cart type torch-cutting machine cut nozzle
Vertical with described surface of steel plate, the height cutting nozzle distance surface of steel plate is set to 20～30mm, and described preheating temperature controls 200
～300 DEG C, cutting speed controls 250～40mm/min, and described steel plate cuts at laggard row stacking slow cooling or high tempering
Reason.
Described stacking slow cooling technological requirement is: when ambient temperature≤10 DEG C, and after steel plate cutting, slot position is with heat insulation
Blanket or asbestos cloth parcel, within parcel time gap is maintained at 5min clipping time.
Described high-temperature tempering process requires: carry out high tempering process, temperature in tempering furnace after steel plate cutting
It is set to 530～570 DEG C.
Optimize further as the present invention, when described steel plate thickness is 50～120mm, cutting speed control 250～
200mm/min。
Optimize further as the present invention, when described steel plate thickness is 120～180mm, cutting speed control 200～
145mm/min。
Optimize further as the present invention, when described steel plate thickness is 180～250mm, cutting speed control 145～
85mm/min。
Optimize further as the present invention, when described steel plate thickness is 250～300mm, cutting speed control 85～
40mm/min。
Optimize further as the present invention, when described steel plate thickness is 280～300mm, cutting speed control 65～
40mm/min。
The concrete technology of each link of concrete technology flow process of the present invention requires to be analyzed as follows:
(1) steel plate preheating: according to plate quality grade and thickness of slab, pre-heating mean uses flame to burn rifle, mainly concentrates on
Preheat near cut mouth, it is adaptable to area is not the biggest, it is possible to achieve uniformly preheat；Electronics heating cushion or heating
Stove heats, and requires that walking slowly, makes whole steel plate uniform cross be heated, with the district of contact-free thermal source in described steel plate warm
There is hot-spot phenomenon in territory；For determining steel plate pre-heat effect, should be temperature required in the test of hot spot quilt cover.
When temperature >=15 DEG C, steel billet temperature ＞ 100 DEG C during cutting；Temperature ＜ 5 DEG C, steel billet temperature ＞ 150 DEG C during cutting；5
DEG C ＜ temperature≤15 DEG C, steel billet temperature ＞ 120 DEG C during cutting；Show according to test data, if reaching preferable pre-heat effect, institute
State steel plate and can directly carry out flame cutting.
(2) band temperature low speed cutting: if cannot be carried out imposite preheating, then use local preheating, then use described low speed
Cutting method prevents from cutting crackle, the low speed cutting for this refers to compared to other class steel plates of stack pile.Before flame cutting
First cutting belt flame gun sky being run several times to preheat, preheating temperature reaches 200～300 ° of C and is advisable；Its maximum cutting rate
Depend on steel plate grade and thickness.This step can be used in combination by the flame cutting method of cutting after preheating described with (1), enters one
Step reduces the occurrence probability of cutting crackle.
(3) stacking slow cooling or high tempering: this processing step core is to take control measure to reduce rate of cooling, specifically has
The following two kinds form:
A: stacking slow cooling, the slow cooling after steel plate cutting can effectively reduce the risk of cutting crackle.Described steel plate is cut by flame
After cutting, immediately when with warm, it being carried out stacking, employing method is: use heat-insulation blanket or asbestos cloth to be covered, heap
Buttress slow cooling requires to be cooled to room temperature, has added this and has seemed usual technical scheme, can be effectively reduced rate of cooling, well
Guarantee cutting after steel plate after insulation to be slowly cooled to room temperature less than V critical cooling rate, avoid steel quenching effect
Cause steel fragility to raise, solve super-thick steel plate strain cracking problem after dicing well.Particularly as temperature ＜ 10
Under conditions of DEG C, within 5min, cutting part heat-insulation blanket or asbestos cloth must be wrapped up after steel plate cuts, just can rise
To reducing the purpose that crackle produces, the effect otherwise reducing crackle can be inconspicuous.
B: high tempering, for carbon steel and the cutting of steel alloy, is carried out at high tempering after steel plate cutting in tempering furnace
Reason, temperature is set to 530～570 DEG C, can effectively eliminate the stress that cutting produces, thus prevent to cut crackle.This work
Skill step is general only to be needed from a: stacking slow cooling or b: select one to carry out operating being effectively improved benefit high tempering.
Later stage quality inspection: it is the biggest that steel plate cutting crackle belongs to retardance crackle, steel plate thickness and hardness, occurs that cutting is split
Stricture of vagina is the biggest, needs to check after flame cutting completes 48 hours, can take optical microscope, scanning electron microscope and energy spectrum analysis
Being sampled detection analysis etc. method, this step is primarily directed in batch production carry out inspecting crack index by random samples and uses, it is ensured that test
Receive qualification rate, technical process is carried out staining effect, and follow-up work is had directive significance.
The invention has the beneficial effects as follows: the present invention by control flame cutting flow process, use first preheat cut afterwards, band temperature low
After speed cutting and cutting, the PROCESS FOR TREATMENT mode of insulation, improves the process using traditional flame cutting, achieves very
Significantly effect, easily produces after being cooled to room temperature and split after revolutionizing employing traditional flame cutting medium and high carbon steel, steel alloy
The present situation of stricture of vagina, especially for the Insulation of operation after cutting, it is to avoid steel fragility raises and strain cracking after dicing,
Improve special thick middle, high-carbon and the comprehensive quality of steel alloy, through scene trial-production and inspection, drastically increase batch production
Acceptable quality level, more allows people unimaginable, by selecting rational cutting technique parameter and Insulation, it is possible in high quality
50～300mm super-thick steel plates are cut off, it is ensured that facet perpendicularity is 2.6～4.8mm, and roughness Ra is even down to 25 microns,
There is substantial feature and achieve significant technological progress；Use technical solutions according to the invention, considerably reduce steel
Iron resource is wasted, and reduces commercial production cost, improves the another breakthrough of domestic iron and steel process technology, it is possible to produce huge
Economic and social benefit.Spy's thickness middle, high-carbon of the present invention and the flame cutting technique of steel alloy, implement difficulty little, and cost is relatively low,
Benefit is fine, has popularity use value.
Detailed description of the invention
Specific embodiment 1
Cutting object of the present invention: cutting steel plate selects thickness to be 300mm, material is the steel plate of 45#, cuts.
The cutting technique flow process that the present invention takes is as follows: using 45# this parameter of thickness 300mm as trolley type cutting thickness
Degree, proceeds by flame cutting, is placed into by cart type torch-cutting machine on the 45# steel plate of 300mm, cart type torch-cutting machine
Cut nozzle with to be cut surface of steel plate vertical, the height cutting nozzle distance surface of steel plate is set to 20mm, set cutting speed as 50～
70mm/min, preheating temperature is 250 DEG C；Carry out within the 5min after dicing of steel plate slot position using heat-insulation blanket to be covered,
Stacking slow cooling is to room temperature；Place 48 hours after cutting, use optical microscope sampling Detection crack index.
The crack detection results of the embodiment of the present invention: do not find that crackle occurs, acceptable quality level 99.7%, facet is vertical
Degree is at 4.6mm, and roughness Ra reaches 25 microns, it is achieved that target.
Specific embodiment 2
Cutting object of the present invention: cutting steel plate selects thickness to be 300mm, material is the steel plate of 45#, cuts.
The cutting technique flow process that the present invention takes is as follows: using 45# this parameter of thickness 300mm as trolley type cutting thickness
Degree, proceeds by flame cutting, is placed into by cart type torch-cutting machine on the 45# steel plate of 300mm, cart type torch-cutting machine
Cut nozzle with to be cut surface of steel plate vertical, the height cutting nozzle distance surface of steel plate is set to 26～28mm, and preheating temperature is 295 DEG C
Left and right；Set cutting speed as 55mm/min；Being processed by high tempering after steel plate cutting, temperature is set to 555 DEG C；Protect
The temperature time presses 5min/mm；Place 50 hours after cutting, use optical microscope sampling Detection crack index.
The crack detection results of the embodiment of the present invention: do not find that crackle occurs, acceptable quality level 100%, facet perpendicularity
At 3.2mm, roughness Ra reaches 24 microns, it is achieved that target.
Specific embodiment 3
Cutting object of the present invention: cutting steel plate selects thickness to be 100mm, material is the steel plate of 45#, cuts.
The cutting technique flow process that the present invention takes is as follows: using 45# this parameter of thickness 100mm as trolley type cutting thickness
Degree, proceeds by flame cutting, is placed into by cart type torch-cutting machine on the 45# steel plate of 100mm, cart type torch-cutting machine
Only heat with preheating flame in cutting starting point, described cart type torch-cutting machine cut nozzle with to be cut surface of steel plate vertical, cut nozzle away from
Height from surface of steel plate is set to 20～30mm, and flame white apex of the heart end is away from surface of steel plate 1.5～2.5mm, and preheating temperature is 260
About DEG C, set cutting speed as 220mm/min；Being processed by high tempering after steel plate cutting, temperature is set to 560
℃；Temperature retention time presses 5min/mm；After placing 48 hours after cutting, use optical microscope sampling Detection crack index.
The crack detection results of the embodiment of the present invention: do not find that crackle occurs, acceptable quality level 99.8%, facet is vertical
Degree is at 4.8mm, and roughness Ra reaches 25 microns, it is achieved that target.
Specific embodiment 4
Cutting object of the present invention: cutting steel plate selects thickness to be 100mm, material is the steel plate of 45#, cuts.
The cutting technique flow process that the present invention takes is as follows: using 45# this parameter of thickness 100mm as trolley type cutting thickness
Degree, proceeds by flame cutting, is placed into by cart type torch-cutting machine on the 45# steel plate of 100mm, cart type torch-cutting machine
Only heat with preheating flame in cutting starting point, described cart type torch-cutting machine cut nozzle with to be cut surface of steel plate vertical, cut nozzle away from
Height from surface of steel plate is set to about 25mm, and flame white apex of the heart end is away from surface of steel plate about 2.0mm, and preheating temperature is to 300
℃；Set cutting speed as 240mm/min；Carry out stacking within the 5min after dicing of steel plate slot position and carry out stacking, use
Heat-insulation blanket is covered, and stacking slow cooling is to room temperature；Place 72 hours after cutting, use optical microscope sampling Detection crackle to refer to
Number.
The crack detection results of the embodiment of the present invention: do not find that crackle occurs, acceptable quality level 100%, facet perpendicularity
At 4.2mm, roughness Ra reaches 24.5 microns, it is achieved that target.
Specific embodiment 5
Cutting object of the present invention: the steel plate that cutting steel plate selects thickness to be 250mm, material is structural alloy steel 40Cr is carried out
Cutting.
The cutting technique flow process that the present invention takes is as follows: using 40Cr this parameter of thickness 250mm as trolley type cutting thickness
Degree, proceeds by flame cutting, is placed into by cart type torch-cutting machine on the structural alloy steel 40Cr steel plate of 250mm, dolly
Only heat with preheating flame in formula cutting torches starting point, the cutting nozzle and cut surface of steel plate of described cart type torch-cutting machine
Vertically, the height cutting nozzle distance surface of steel plate is set to 25mm, and flame white apex of the heart end is away from surface of steel plate 1.5～2.5mm, and setting is cut
Cutting speed is 120～200mm/min, uses heat-insulation blanket to be covered it immediately and carry out heap after steel plate cutting when with warm
Buttress, stacking slow cooling is to room temperature；Place 72 hours after cutting, use optical microscope sampling Detection crack index.
The crack detection results of the embodiment of the present invention: statistic sampling point has fine crack to occur, after again mend survey multiple spot, crackle
Occurrence rate reaches 1.5%, qualification rate 97.5%.
Specific embodiment 6
Cutting object of the present invention: the steel plate that cutting steel plate selects thickness to be 250mm, material is structural alloy steel 40Cr is carried out
Cutting.
The cutting technique flow process that the present invention takes is as follows: using 40Cr this parameter of thickness 250mm as trolley type cutting thickness
Degree, proceeds by flame cutting, is placed into by cart type torch-cutting machine on the structural alloy steel 40Cr steel plate of 250mm, dolly
Only heat with preheating flame in formula cutting torches starting point, the cutting nozzle and cut surface of steel plate of described cart type torch-cutting machine
Vertically, the height cutting nozzle distance surface of steel plate is set to 20mm, and flame white apex of the heart end is away from surface of steel plate 1.5～2.0mm, and setting is cut
Cutting speed is 85～100mm/min, and preheating temperature is to 300 DEG C；In 4min, it is carried out stacking with warm after steel plate cutting, make
Being covered with heat-insulation blanket, stacking slow cooling is to room temperature；Place 72 hours after cutting, use optical microscope sampling Detection crackle to refer to
Number.
The crack detection results of the embodiment of the present invention: do not find that crackle occurs, acceptable quality level 100%, facet perpendicularity
At 4.0mm, roughness Ra reaches 23.5 microns, it is achieved that target.
The present invention by control flame cutting flow process, use first preheat cut afterwards, band temperature low speed cutting and cut after insulation
PROCESS FOR TREATMENT mode, improve use traditional flame cutting process, achieve the effect of highly significant, thoroughly change
The present situation easily cracked after being cooled to room temperature after using traditional flame cutting medium and high carbon steel, steel alloy, especially for
The Insulation of operation after cutting, it is to avoid steel fragility raises and strain cracking after dicing, improves special thick middle, high-carbon
And the comprehensive quality of steel alloy, through scene trial-production and inspection, drastically increase batch production acceptable quality level, more allow people think
Less than, by selecting rational cutting technique parameter and Insulation, it is possible in high quality by 50～300mm super-thick steel plates
Cut off, it is ensured that facet perpendicularity is 2.2～4.8mm, and roughness Ra is even down to 25 microns, has substantial feature and takes
Obtained significant technological progress；Use technical solutions according to the invention, considerably reduce iron and steel resource waste, reduce work
Industry production cost, improves the another breakthrough of domestic iron and steel process technology, it is possible to produce huge economic and social benefit.This
Bright special thick middle, high-carbon and the flame cutting technique of steel alloy, implement difficulty little, and cost is relatively low, and benefit is fine, has and generally pushes away
Wide use value.
Enforcement recited above only in order to illustrative not limiting technical scheme, is designing think of without departing from the present invention
On the premise of thinking, any modification or partial replacement that the technical program is made by those skilled in the art, all should contain
In the middle of scope of the presently claimed invention.
Claims (4)
1. special thick middle, high-carbon and a flame cutting technique for steel alloy steel plate, use cart type torch-cutting machine, its feature
Be: first preheat cut afterwards, band temperature low speed cutting and cutting after insulation PROCESS FOR TREATMENT mode, cart type torch-cutting machine is put
Put on special thick middle, high-carbon to be cut and steel alloy steel plate, cutting parameter, trolley type fire are set according to described steel plate thickness value
Flame cutting machine to cut nozzle vertical with described surface of steel plate, cut the height of nozzle distance surface of steel plate and be set to 20～30mm, described pre-
Hot temperature controls at 200～300 DEG C, and cutting speed controls 250～40mm/min, and described steel plate cuts laggard row stacking slow cooling
Or high tempering processes；When ambient temperature≤10 DEG C, slot position heat-insulation blanket or asbestos cloth bag after steel plate cutting
Wrap up in, within parcel time gap is maintained at 5min clipping time；In tempering furnace, carry out high tempering process after steel plate cutting, return
Fire temperature is set to 530～570 DEG C.
2. the most special thick middle, high-carbon and the flame cutting technique of steel alloy steel plate, it is characterised in that: described
When steel plate thickness is 50～120mm, cutting speed controls 250～200mm/min.
3. the most special thick middle, high-carbon and the flame cutting technique of steel alloy steel plate, it is characterised in that: described
When steel plate thickness is 180～250mm, cutting speed controls 145～85mm/min.
4. the most special thick middle, high-carbon and the flame cutting technique of steel alloy steel plate, it is characterised in that: described
When steel plate thickness is 280～300mm, cutting speed controls 65～40mm/min.
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| CN201310083780.6A CN103170704B (en) | 2013-03-16 | 2013-03-16 | A kind of special thick middle, high-carbon and the flame cutting technique of steel alloy steel plate |
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| CN103170704B true CN103170704B (en) | 2016-10-12 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105834548B (en) * | 2016-06-07 | 2018-02-02 | 南京钢铁股份有限公司 | A kind of gas flame cuttiug technique of steel plate |
| CN106825844B (en) * | 2017-03-10 | 2019-02-05 | 郑州煤矿机械集团股份有限公司 | The elongated main reinforcement groove method for hot cutting of hydraulic support for low coal seam top beam |
| CN107214427A (en) * | 2017-05-16 | 2017-09-29 | 合肥市瀚坤机械有限公司 | One kind takes door frame welding procedure |
| CN109570688A (en) * | 2019-01-03 | 2019-04-05 | 南京钢铁股份有限公司 | A kind of method of gas flame cuttiug carbon steel blank |
| CN111168192B (en) * | 2020-02-20 | 2021-04-27 | 新余钢铁股份有限公司 | Hot cutting method for high-hardness wear-resistant steel plate with thickness of 50-80 mm |
| CN111922639A (en) * | 2020-07-29 | 2020-11-13 | 葛家玉 | Processing method of wear-resistant easy-to-form special steel |
| CN114147434A (en) * | 2021-12-24 | 2022-03-08 | 舞阳钢铁有限责任公司 | Method for improving cutting quality of medium and high carbon steel of ultra-thick plate |
| CN114682876A (en) * | 2022-02-25 | 2022-07-01 | 舞阳钢铁有限责任公司 | Production method for improving cutting quality of large-thickness alloy steel plate |
| CN114850618A (en) * | 2022-05-31 | 2022-08-05 | 宝武集团鄂城钢铁有限公司 | Cutting method for reducing edge cracks of steel plate |
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| JP4372265B2 (en) * | 1999-06-08 | 2009-11-25 | Ｊｆｅスチール株式会社 | Welding method |
| CN102528210A (en) * | 2011-12-30 | 2012-07-04 | 中信重工机械股份有限公司 | Torch-flame cutting process for super-thick steel plates |
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