CN102912101B - Production process of 65 Mn spring steel wire rod and 65 Mn spring steel wire rod - Google Patents
Production process of 65 Mn spring steel wire rod and 65 Mn spring steel wire rod Download PDFInfo
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Abstract
The invention discloses a production process of a 65 Mn spring steel wire rod and a 65 Mn spring steel wire rod. According to the invention, advantages of a device of a high line set are utilized, a finish rolling and reducing-sizing mills adopt 8+4 type, through optimization of a heating cycle process before rolling, a rolling control process and a cooling control process, only 8 front finish rolling machines and 2 reducing-sizing mills are utilized, so that surface decarburization of a spring is reduced and is even removed, and the fatigue life of a finished spring is prolonged; the amount of scales is reduced and the metal yield is improved; a metallographic structure is improved and a high sorbite rate is obtained, so that the production process has conditions to cancel a lead patenting process at the earlier drawing stage, the production processing cost is reduced, and the metallographic structure and the comprehensive performance of a hot-rolled wire rod for the 65 Mn spring steel are optimized. According to the invention, the microstructure quality and the mechanical property of the produced hot-rolled wire rod with phi6.5 mm for the 65 Mn spring steel reach the standard of the conventional 65 Mn spring steel after lead hot-rolled wire rod for the 65 Mn spring steel, the conditions to cancel the lead patenting process at the earlier drawing stage by a downstream user can be satisfied, a processing process is reduced for a user, and the production cost is reduced.
Description
Technical field
The invention belongs to field of metallurgy, relate to a kind of production technique of wire rod, more particularly, relate to a kind of production technique of 65Mn spring steel wire rod and the 65Mn spring steel wire rod obtaining according to this production technique.
Background technology
Spring steel wire rod has the feature of high-carbon and low alloy steel concurrently, for making the important source material of the metal productss such as common spring wire, oil-tempered spring wire, automobile and agricultural vehicle damper spring, other mechanical spring, the product that a kind of added value is high, the huge market demand.And 65Mn steel is one of topmost spring steel in the market, is also one of spring steel of the current large usage quantity in southwest.
Spring Main Function is storage elasticity strain energy and alleviates shock and impact.Because spring is generally used under the condition of dynamic load (alternating bending stress or reversed torsion stress), therefore require spring steel must have high elastic limit σ e, high yield strength σ s, tensile strength sigma b, high yield tensile ratio σ s/ σ b and high anti-fatigue performance, and there are enough plasticity and toughness, good hardening capacity and low Decarburization Sensitivity, so that be easy to obtain required performance after moulding and thermal treatment under cold-hot condition.65Mn steel has through hardening better performances, intensity compared with advantages of higher, for the manufacture of spring, is widely used.Therefore, spring steel wire rod requires just to have to have high tensile strength and fatigue lifetime.
65Mn spring steel wire rod also will carry out the techniques such as surperficial de-scaling, cold-drawn, thermal treatment in following process process, so its surface quality is had higher requirements.65Mn spring steel wire rod requires to have high cleanliness factor and homogeneity of ingredients, and the strict control surface decarburization of palpus, requires uniform Microstructure and properties, otherwise can cause that the poker characteristic of wire rod is inhomogeneous, causes wire broken rate higher, affects the subsequent machining technology performance of product.
Traditional 65Mn spring steel wire rod adopts pair rolling, and finished surface decarburization is serious, ferric oxide skin depth, recovery rate of iron are lower, and metallographic structure is the perlite that sheet interlayer spacing is larger, and production cost is higher.Thus obtained spring steel wire rod needs to carry out patenting in drawing process could obtain sorbite tissue, thereby obtain good comprehensive mechanical property, be tensile strength Rm >=1050MPa, relative reduction in area Z >=36%, the 65Mn spring steel wire rod that possesses this metallographic structure and mechanical property, the fatigue lifetime that is difficult for fracture of wire and spring when spring winding is long, and spring comprehensive mechanical property is good.
Due to loading characteristic and the work characteristics of spring, spring steel surface decarburization meeting obviously reduces the safe range of stress of spring.Except rolling rear process for cooling, heating condition is also the important factor that affects spring steel wire rod surface decarburization.Therefore, need to study a kind of new production technique, reach and optimize the metallographic structure of 65Mn spring steel wire rod and the object of over-all properties.
Summary of the invention
For the deficiencies in the prior art, one of object of the present invention is to solve the one or more problems that exist in above-mentioned prior art.
The object of the present invention is to provide and a kind ofly can reduce fatigue lifetime of even eliminating wire rod surface decarburization, improving finished product spring, reduce iron scale amount and improve recovery rate of iron, improve metallographic structure improves spring steel wire rod intensity and plasticity to obtain high sorbite rate and make it possess the condition of cancelling drawing patenting in early stage operation, thereby reduce the production technique of 65Mn spring steel wire rod of process for processing cost and the 65Mn spring steel wire rod obtaining according to this production technique.
To achieve these goals, an aspect of of the present present invention provides a kind of production technique of 65Mn spring steel wire rod, described production technique comprises following operation: raw material is prepared, smelting molten steel, continuous casting becomes base, add hot continuously cast material, high temperature rolling becomes wire rod, after weaving silk, roll rear control cooling, aftertreatment also obtains wire rod finished product, wherein, by weight percentage, described wire rod finished product comprises following chemical composition: C:0.63～0.68%, Si:0.15～0.30%, Mn:0.95～1.15%, P≤0.018%, S≤0.016%, Cr≤0.15%, Ni≤0.15%, Cu≤0.10%, Mo≤0.02%, Ti≤0.01%, the Fe of Als≤0.015% and surplus and inevitably impurity, in the described step that adds hot continuously cast material, controlling preheating section temperature and be 780～820 ℃, warm up time is 35～50 minutes, heating zone temperature is that 960～1000 ℃, heat-up time are 35～50 minutes, soaking zone temperature is that 1010～1050 ℃, soaking time are 30～40min, and to control furnace atmosphere be weak reducing atmosphere, at described high temperature rolling, become in the step of wire rod, controlling start rolling temperature is 960～1000 ℃, and finishing train and reducing sizing mill group adopt 8+4 type to be rolled, and only uses front 8 finishing train and 2 reducing sizing mill groups, after rolling after described weaving silk, control in cooling step, controlling laying temperature is 870～890 ℃, and it is cooling to adopt stelmor control cold line to carry out the rear control of rolling of wire rod, controlling stelmor roller-way speed is respectively, the cooling rate that controlling board twists in before pearlitic transformation is 13～15 ℃/s, pearlitic transformation temperature is controlled at 660～710 ℃, and after phase transformation, cooling rate is 4～5 ℃/s, make cooling after, the wire rod surface temperature before aftertreatment is less than or equal to 300 ℃.
According to the production technique of 65Mn spring steel wire rod of the present invention embodiment, in the described step that adds hot continuously cast material, the middle point for measuring temperature temperature of controlling described preheating section is 790～810 ℃.
According to the production technique of 65Mn spring steel wire rod of the present invention embodiment, described high temperature rolling becomes the step of wire rod to comprise to make continuously cast bloom by roughing unit, intermediate mill, finishing train and reducing sizing mill group, to form successively the step of wire rod, wherein, the temperature that control wire rod enters finishing train entrance is 860～880 ℃, and the temperature that control wire rod enters reducing sizing mill group entrance is 860～880 ℃.
According to the production technique of 65Mn spring steel wire rod of the present invention embodiment, the nominal diameter of described wire rod finished product is 6.5mm.
According to the production technique of 65Mn spring steel wire rod of the present invention embodiment, one side total decarburized layer degree of depth of described wire rod finished product is not more than 1.5% of wire rod finished product nominal diameter.
According to the production technique of 65Mn spring steel wire rod of the present invention embodiment, the actual measurement yield strength R of described wire rod finished product
0 eL>=795MPa, actual measurement tensile strength R
0 m>=990MPa, elongation A>=12.5%, relative reduction in area Z>=32%.
Another aspect of the present invention provides a kind of 65Mn spring steel wire rod, and described wire rod is made according to the production technique of above-mentioned 65Mn spring steel wire rod.
The present invention compared with prior art, used the equipment advantage of high line unit, high temperature rolling becomes wire rod to adopt the finish rolling reducing sizing mill group of 8+4 type, and only use front 8 finishing mills and 2 sizing units, not only guarantee production stability but also reduced production energy consumption, also solved same type machine production line tube reducing unit in reducing sizing mill group in industry and occurred equipment failure or there is no the problem with regard to stopping production in spare part situation.By optimizing heating cycle, controlled rolling, the Controlled cooling process before rolling, reduce and even eliminated wire rod surface decarburization, improved the fatigue lifetime of finished product spring; Reduce iron scale amount, improved recovery rate of iron; Improving metallographic structure makes it possess the condition of cancelling drawing patenting in early stage operation to obtain intensity and the plasticity of high sorbite rate raising spring steel wire rod, reduced process for processing cost, reached and optimize the metallographic structure of gren rod and the object of over-all properties for 65Mn spring steel.
Accompanying drawing explanation
Figure 1A and Figure 1B are the micro test metallographic structure schematic diagram of the sample one of 65Mn spring steel wire rod in the embodiment of the present invention.
Fig. 2 A and Fig. 2 B are the micro test metallographic structure schematic diagram of the sample two of 65Mn spring steel wire rod in the embodiment of the present invention.
Fig. 3 A and Fig. 3 B are the micro test metallographic structure schematic diagram of the sample three of 65Mn spring steel wire rod in the embodiment of the present invention.
Embodiment
Hereinafter, in connection with exemplary embodiment, describe production technique and the 65Mn spring steel wire rod of 65Mn spring steel wire rod of the present invention in detail.
According to the exemplary embodiment of the production technique of 65Mn spring steel wire rod of the present invention, described production technique comprises following operation: raw material is prepared, smelting molten steel, continuous casting becomes base, add hot continuously cast material, high temperature rolling becomes wire rod, after weaving silk, roll rear control cooling, aftertreatment also obtains wire rod finished product, wherein, by weight percentage, described wire rod finished product comprises following chemical composition C:0.63～0.68%, Si:0.15～0.30%, Mn:0.95～1.15%, P≤0.018%, S≤0.016%, Cr≤0.15%, Ni≤0.15%, Cu≤0.10%, Mo≤0.02%, Ti≤0.01%, the Fe of Al s≤0.015% and surplus and inevitably impurity, in the described step that adds hot continuously cast material, controlling preheating section temperature and be 780～820 ℃, warm up time is 35～50 minutes, heating zone temperature is that 960～1000 ℃, heat-up time are 35～50 minutes, soaking zone temperature is that 1010～1050 ℃, soaking time are 30～40min, and to control furnace atmosphere be weak reducing atmosphere, at described high temperature rolling, become in the step of wire rod, controlling start rolling temperature is 960～1000 ℃, and finishing train and reducing sizing mill group adopt 8+4 type to be rolled, and only uses front 8 finishing train and 2 reducing sizing mill groups, after rolling after described weaving silk, control in cooling step, controlling laying temperature is 870～890 ℃, and it is cooling to adopt stelmor control cold line to carry out the rear control of rolling of wire rod, the cooling rate that controlling board twists in before pearlitic transformation is 13～15 ℃/s, pearlitic transformation temperature is controlled at 660～710 ℃, after phase transformation, cooling rate is 4～5 ℃/s, make cooling after, the wire rod surface temperature before aftertreatment is less than or equal to 300 ℃.
In the present embodiment, the present invention mainly improves concrete technology in the step such as cooling after adding hot continuously cast material, rolling, rolling, and has effectively optimized tissue and the performance of 65Mn spring steel wire rod, has simplified processing sequence and has lowered production cost.
According to the present invention, in adding the step of hot continuously cast material, controlling preheating section temperature and be 780～820 ℃, warm up time is 35～50 minutes, and heating zone temperature is that 960～1000 ℃, heat-up time are 35～50 minutes, and soaking zone temperature is that 1010～1050 ℃, soaking time are 30～40min.And control furnace atmosphere is weak reducing atmosphere, finally make the top and bottom temperature difference, the total length temperature difference of continuously cast bloom all be no more than 30 ℃.Preferably, the middle point for measuring temperature of preheating section be preheating section near the region of heating zone, this regional temperature can be subject to heating zone temperature radiation and increase, in order to guarantee the preheating section time, the middle point for measuring temperature temperature that must control preheating section is 790～810 ℃.Temperature and the heat-up time of controlling heating zone and soaking zone, can effectively guarantee start rolling temperature, if the Heating temperature in these two sections of regions is too low or heat-up time is too short, cannot guarantees start rolling temperature or make the non-uniform temperature of continuously cast bloom; If temperature height or grown heat-up time, the scaling loss and the surface decarburization that increase blank are affected to billet quality, and cause its intensity of thick reduction and the plasticity and toughness of original austenite grains.And to guarantee the temperature and time of heating zone and soaking zone, need appropriate design preheating section temperature and heat-up time, if preheating section temperature is low or heat-up time short will make ensuing heating zone temperature not or steel billet internal and external temperature uneven, if preheating section temperature height by increasing blank internal stress, increase the probability that crack defect produces, if preheating section has been grown reduction steel rolling rhythm and affected production efficiency heat-up time.Surface decarburization is the normal defect occurring of high carbon steel, and in order to reduce decarburization, in many group heating-furnaces, data analysis draws and adopts weak reducing atmosphere can effectively control decarburization, and in process furnace, concrete Control of gas content is as shown in table 1.
Concrete gas content in table 1 process furnace
Because walking beam furnace is steel billet head end and tail end switch type " flame ", so steel billet exists the temperature difference.In order to improve the poker characteristic homogeneity of finished product, must guarantee that the continuously cast bloom top and bottom temperature difference, the total length temperature difference are no more than 30 ℃.
According to relevant research, show: in adding the process of hot continuously cast material, the continuously cast bloom contingent reaction in surface in process furnace has:
Fe
3C+2O
2＝3FeO+CO (1)，
Fe
3C+H
2O＝3Fe+CO+H
2(2)，
Fe
3C+CO
2＝3Fe+2CO (3)，
2Fe
3C+O
2＝6Fe+2CO (4)，
Fe
3C+2H
2＝3Fe+CH
4(5)，
Above-mentioned reaction process is to have the furnace gas of decarburization capacity and the Fe in steel
3the interactional result of C, wherein the decarburization capacity of water vapour is the strongest, is secondly CO
2, O
2and H
2.By formula (1), (4) are known, reduce the content of oxygen in stove, can slow down steel surface decarburization; And the dividing potential drop of CO is higher in stove, in atmosphere carbon potential and steel, the difference of carbon content is also little, and wire rod practical decarburized depth is also thinner.Therefore, in production, should strictly control the water-content burning in coal gas in process furnace, control the massfraction of oxygen, increase the content of CO.
According to the present invention, at high temperature rolling, become in the step of wire rod, in order not only to control original grain degree but also reduce the reasonable controlled rolling temperature of roll wear need, therefore start rolling temperature is controlled at 960～1000 ℃, if start rolling temperature can cause original austenite grains degree thick higher than this scope, if can increasing the weight of roll wear lower than this scope, start rolling temperature increases production cost.
According to the present invention, high temperature rolling becomes the step of wire rod to comprise to make continuously cast bloom by roughing unit, intermediate mill, finishing train and reducing sizing mill group, to form successively the step of wire rod.Particularly, in order to obtain small grains, the temperature that requires control wire rod to enter finishing train entrance is 860～880 ℃, and the temperature that control wire rod enters reducing sizing mill group entrance is 860～880 ℃.If wire rod higher than claimed range value, will make the coarse grains of steel affect its mechanical property in the temperature of finishing train, reducing sizing mill group entrance; And if lower than claimed range value, will increase the weight of roll wear, increase production cost; In addition, wire rod will guarantee that in too high or too low for temperature being all difficult to of reducing sizing mill group entrance laying temperature is in claimed range.
According to the present invention, at high temperature rolling, become in the step of wire rod, finishing train and reducing sizing mill group adopt 8+4 type, and only use front 8 finishing mills and 2 sizing units.So not only guaranteed production stability but also reduced production energy consumption, and also having solved same type machine production line tube reducing unit in reducing sizing mill group in industry and occurred equipment failure or there is no the problem with regard to stopping production in spare part situation.
According to the present invention, after rolling after weaving silk, control in cooling step, controlling laying temperature is 870～890 ℃, and it is cooling to adopt stelmor control cold line to carry out the rear control of rolling of wire rod, the cooling rate that controlling board twists in before pearlitic transformation is 13～15 ℃/s, pearlitic transformation temperature is controlled at 660～710 ℃, and after phase transformation, cooling rate is 4～5 ℃/s, make cooling after, the wire rod surface temperature before aftertreatment is less than or equal to 300 ℃.Rolling the cooling object of rear control is after high temperature rolling, to control the phase transition process of rolled piece, thereby controls steel structural state, and then improves comprehensive mechanical property and the use properties of wire rod.Laying temperature is too low can reduce stabilization of austenite, easily separates out pro-eutectoid phase, for pro-eutectoid, is ferritic 65Mn hypoeutectoid steel mutually, and this will reduce its intensity effect wire rod use properties; The too high one side of laying temperature can make the coarse grains of steel reduce its mechanical property, and also can increase on the other hand wire rod surface decarburization affects follow-up use.If the cooling rate before pearlitic transformation is on the low side, can not Quick winding cross pro-eutectoid and form mutually district, will generate the proeutectoid ferrite that reduces wire rod intensity; If the cooling rate before pearlitic transformation is too fast, can be difficult to control follow-up transformation temperature and causes to generate and affect the even abnormal structure such as martensite, bainite of the troostite of wire rod following process.The perlite sheet spacing that can increase pearlitic transformation excess Temperature reduces sorbite percentage and reduces properties for follow, and the too low meeting of pearlitic transformation temperature makes perlite sheet spacing meticulous and form troostite, also can affect wire rod properties for follow.Therefore, must determine rational laying temperature and coordinate suitable cooling control after rolling technique, just can obtain the tissue needing.
At an embodiment of the production technique of 65Mn spring steel wire rod of the present invention, the nominal diameter of wire rod finished product is 6.5mm.And one side total decarburized layer degree of depth of the wire rod finished product that the production technique of 65Mn spring steel wire rod obtains is according to an exemplary embodiment of the present invention not more than 1.5% of wire rod finished product nominal diameter, wherein total decarburized layer comprises ferrite and transition layer; In the metallographic structure of wire rod finished product, be mainly nodular troostite, sorbitic content is no less than 85%, and does not allow martensite and martensite remnant tissue, Wei Shi body and cementite network etc. to have the tissue that impact is used to exist; The actual measurement yield strength R of wire rod finished product
0 eL>=795MPa, actual measurement tensile strength R
0 m>=795MPa, elongation A>=12.5%, relative reduction in area Z>=32%.
65Mn spring steel wire rod according to the present invention is the production technique preparation that adopts above-mentioned 65Mn spring steel wire rod.In an embodiment of 65Mn spring steel wire rod of the present invention, the nominal diameter of wire rod is 6.5mm; One side total decarburized layer degree of depth of wire rod is not more than 1.5% of wire rod finished product nominal diameter; In the metallographic structure of wire rod, be mainly nodular troostite, sorbitic content is no less than 85%; The actual measurement yield strength R of wire rod
0 eL>=795MPa, actual measurement tensile strength R
0 m>=990MPa, elongation A>=12.5%, relative reduction in area Z>=32%.
Particularly, the exemplary embodiment of the production technique of 65Mn spring steel wire rod can comprise the following steps:
Raw material preparation, smelting molten steel, continuous casting become base, add hot continuously cast material, high temperature rolling becomes wire rod, roll that rear control is cooling after weaving silk, aftertreatment obtain wire rod finished product.
Be specially raw material (blast-melted) → 50 ton converter steelmaking → LF external refining → protection continuous casting → steel billet check → (reconditioning) → process furnace charging roller material loading → steel billet enter stove → walking-beam furnace heating → furnace delivery table steel billet six rolling → 1# flying shear crops of come out of the stove → high-pressure water descaling → roughing (accident is cataclasm) → in roll six rolling → 2# flying shear crops, tail (accident is cataclasm) → in roll two rollings → pre-four rollings of finish rolling (comprising vertical kink) → 1#, 2# water cooling box is cooling → 3# flying shear crop (accident is cataclasm) → Horizontal loose sleeve → BGV8 frame finish rolling → 3#, 4# water cooling box is cooling → the empty mistake of TMB1 sinking mill, close → (pinch roll) → Laying head of TMB2 fixed diameter rolling → 5# water cooling box → loose volume is cooling → and collection furls collection → extension volume → PF hook-type fortune machine and transports → check on the quality, sampling, wipe out end to end → compress the bundling → extension label of weighing → unload volume → warehouse-in → finished product to transport.
Wherein, the continuously cast bloom heating condition optimal control in process furnace is as shown in table 2.
The heating condition of table 2 continuously cast bloom
The middle point for measuring temperature of preheating section is controlled at 790～810 ℃.Furnace atmosphere is week reduction, makes the top and bottom temperature difference, the total length temperature difference of continuously cast bloom all should be no more than 30 ℃.
During controlled rolling, to enter the temperature of finishing train entrance be 860～880 ℃ to wire rod, and the temperature that wire rod enters reducing sizing mill group entrance is 860～880 ℃; Laying temperature is 870～890 ℃.
Roll the cooling employing stelmor of rear control control cold line and carry out, the control of stelmor roller-way speed is as shown in table 3, and the control of stelmor fan delivery is as shown in table 4, makes to enter after cooling surface temperature≤300 ℃ of the wire rod of collection reel.
Table 3 stelmor roller-way speed
| Roller-way section | 1 section | 2 sections | 3 sections | 4 sections | 5 sections | 6 sections | 7 sections |
| Roller-way speed (m/s) | 0.66 | 0.66 | 0.66 | 0.69 | 0.72 | 0.76 | 0.80 |
| Roller-way section | 8 sections | 9 sections | 10 sections | 11 sections | 12 sections | 13 sections | |
| Roller-way speed (m/s) | 0.84 | 0.88 | 0.88 | 0.88 | 0.88 | 0.88 |
Table 4 stelmor fan delivery
| Blower fan numbering | 1# | 2# | 3# | 4# | 5# | 6# | 7# | 8# | 9# | 10# |
| Air quantity (HZ) | 42 | 42 | 40 | 40 | 40 | 40 | 38 | 38 | 38 | 38 |
The mechanical performance index that the present embodiment will reach is as shown in table 5.
Table 5 mechanical performance index
One side total decarburized layer (ferrite+transition layer) degree of depth of the wire rod that the present embodiment obtains should be not more than 1.5% of wire rod nominal diameter, and metallographic structure is mainly nodular troostite, wherein sorbite is no less than 85%, does not allow martensite and martensite remnant tissue, Wei Shi body and cementite network etc. to have the tissue that impact is used to exist.
Enumerating concrete example is below further elaborated exemplary embodiment of the present invention.Example is only for the present invention is described, and not limits by any way the present invention.
In example below, 65Mn spring steel wire rod 3 stoves that nominal diameter is 6.5mm have been manufactured experimently in production, difference called after sample one, sample two and sample three, its concrete production technique is strictly undertaken by the production technique of above-mentioned 65Mn spring steel wire rod, therefore not to repeat here, the finished product of each sample of gained through check after indices as shown in table 6, table 7, table 8 and Figure 1A to Fig. 3 B.
The chemical composition of the 65Mn spring steel wire rod of table 6 Φ 6.5mm
The mechanical property of the 65Mn spring steel wire rod of table 7 Φ 6.5mm
As shown in Table 7, the sample one of the 65Mn spring steel wire rod of the Φ 6.5mm of trial-production to the mechanical property of sample three has all reached internally controlling requirement value, and relative reduction in area Z is generally far above internally controlling requirement value, good mechanical performance.And, mechanical performance index all reaches the mechanical properties value even far having surpassed after a thermal treatment of traditional 65Mn, the 65Mn spring steel wire rod of producing according to the production technique of 65Mn spring steel wire rod of the present invention possesses the mechanical property of wire rod after drawing patenting in early stage, can meet thus the requirement of the patenting operation of cancelling early stage, for downstream user reduces manufacturing procedure, reduce production costs.
The micro test interpretation of result of the 65Mn spring steel wire rod of table 8 Φ 6.5mm
By table 8, Figure 1A to Fig. 3 B, can be found out, the mirco structure quality of the 65Mn spring steel wire rod of producing according to the production technique of 65Mn spring steel wire rod of the present invention has also reached the level of traditional 65Mn spring steel after patenting, also can meet the requirement that downstream user is cancelled drawing patenting in early stage.
In sum, adopt the production technique of 65Mn spring steel wire rod of the present invention, can make full use of the advanced production equipment of current high-speed wire rolling line and the rolling water cooling system of outfit and stelmor control cold line, and by controlled rolling and controlled cooling, control the metallographic structure of high-carbon steel wire rod, obtain higher sorbite rate.Finishing train and reducing sizing mill group adopt 8+4 type and only use the rolling technology of front 8 finishing mills and 2 sizing units not only to guarantee production stability but also reduced production energy consumption, have solved same type machine production line tube reducing unit in reducing sizing mill group in industry and have occurred equipment failure or there is no the problem with regard to stopping production in spare part situation.Controlled Rolling And Controlled Cooling is applied to the production rolling of 65Mn spring steel wire rod, not only can obtain good metallographic structure to obtain good combination of strength and toughness, and the patenting operation that can cancel early stage, reach the object reducing costs, can also reduce obtained 65Mn spring steel wire rod scale on surface content and improve recovery rate of iron simultaneously, and to a certain degree reduce wire rod surface decarburization layer depth, reach and optimize the metallographic structure of 65Mn spring steel wire rod and the object of over-all properties.
Although described the present invention in conjunction with exemplary embodiment above, those of ordinary skills should be clear, in the situation that do not depart from the spirit and scope of claim, can carry out various modifications to above-described embodiment.
Claims (7)
1. a production technique for 65Mn spring steel wire rod, is characterized in that, described production technique comprises following operation:
Raw material preparation, smelting molten steel, continuous casting become base, add hot continuously cast material, high temperature rolling becomes wire rod, roll that rear control is cooling after weaving silk, aftertreatment obtain wire rod finished product,
Wherein, by weight percentage, described wire rod finished product comprises following chemical composition: the Fe of C:0.63～0.68%, Si:0.15～0.30%, Mn:0.95～1.15%, P≤0.018%, S≤0.016%, Cr≤0.15%, Ni≤0.15%, Cu≤0.10%, Mo≤0.02%, Ti≤0.01%, Als≤0.015% and surplus and inevitably impurity, and in the metallographic structure of described wire rod finished product, be mainly nodular troostite, sorbitic content is no less than 85%;
In the described step that adds hot continuously cast material, controlling preheating section temperature and be 780～820 ℃, warm up time is 35～50 minutes, heating zone temperature is that 960～1000 ℃, heat-up time are 35～50 minutes, soaking zone temperature is that 1010～1050 ℃, soaking time are 30～40min, and to control furnace atmosphere be weak reducing atmosphere;
At described high temperature rolling, become in the step of wire rod, controlling start rolling temperature is 960～1000 ℃, and finishing train and reducing sizing mill group adopt 8+4 type to be rolled, and only uses front 8 finishing train and 2 reducing sizing mill groups;
After rolling after described weaving silk, control in cooling step, controlling laying temperature is 870～890 ℃, and it is cooling to adopt stelmor control cold line to carry out the rear control of rolling of wire rod, the cooling rate that controlling board twists in before pearlitic transformation is 13～15 ℃/s, pearlitic transformation temperature is controlled at 660～710 ℃, after phase transformation, cooling rate is 4～5 ℃/s, make cooling after, the wire rod surface temperature before aftertreatment is less than or equal to 300 ℃.
2. the production technique of 65Mn spring steel wire rod according to claim 1, is characterized in that, in the described step that adds hot continuously cast material, the middle point for measuring temperature temperature of controlling described preheating section is 790～810 ℃.
3. the production technique of 65Mn spring steel wire rod according to claim 1, it is characterized in that, described high temperature rolling becomes the step of wire rod to comprise to make continuously cast bloom by roughing unit, intermediate mill, finishing train and reducing sizing mill group, to form successively the step of wire rod, wherein, the temperature that control wire rod enters finishing train entrance is 860～880 ℃, and the temperature that control wire rod enters reducing sizing mill group entrance is 860～880 ℃.
4. the production technique of 65Mn spring steel wire rod according to claim 1, is characterized in that, the nominal diameter of described wire rod finished product is 6.5mm.
5. the production technique of 65Mn spring steel wire rod according to claim 1, is characterized in that, one side total decarburized layer degree of depth of described wire rod finished product is not more than 1.5% of wire rod finished product nominal diameter.
6. the production technique of 65Mn spring steel wire rod according to claim 1, is characterized in that, the actual measurement yield strength R of described wire rod finished product
0 eL>=795MPa, actual measurement tensile strength R
0 m>=990MPa, elongation A>=12.5%, relative reduction in area Z>=32%.
7. a 65Mn spring steel wire rod, is characterized in that, described wire rod is made according to the production technique of the 65Mn spring steel wire rod described in any one in claim 1 to 6.
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| CN201210398901.1A CN102912101B (en) | 2012-10-19 | 2012-10-19 | Production process of 65 Mn spring steel wire rod and 65 Mn spring steel wire rod |
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| CN201210398901.1A CN102912101B (en) | 2012-10-19 | 2012-10-19 | Production process of 65 Mn spring steel wire rod and 65 Mn spring steel wire rod |
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| CN102912101B true CN102912101B (en) | 2014-03-19 |
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