CN102230139A - Production process of high-strength mining chain wire rod - Google Patents
Production process of high-strength mining chain wire rod Download PDFInfo
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Abstract
The invention discloses a production process of a high-strength mining chain wire rod. The production process comprises the following procedures: inspecting a billet; heating the steel billet; descaling by high pressure water; rough and intermediate rolling and pre-precision rolling; water-cooling of an area 1; precision-rolling; water-cooling of an area 2; reducing and sizing rolling; water-cooling of an area 3; spinning; air-cooling; covering; slow-cooling; uncovering; coil-collecting; finishing; packaging; and warehousing to finally obtain the high-strength mining chain wire rod. In the invention, by utilizing a controlled-rolling and controlled-cooling process, process control is carried out on the mining chain wire rod so as to form an F+P structure suitable for processing a chain; the obtained chain wire rod has good comprehensive mechanical properties and can be produced in a chain factory by utilizing a simple process; and the production process has the advantages of low energy consumption, less equipment investment and high production efficiency, thus greatly lowering production cost.
Description
Technical field
The invention belongs to field of metallurgy, relate to a kind of production technique of wire rod, the production technique of the mining chain wire rod of a kind of specifically high strength.
Background technology
During existing at home mining chain wire rod is produced, generally adopt wire rod such as 25MnVB as the starting material of making mining chain.Existing this mining chain wire rod need just can be made chain through Overheating Treatment, and production technique is complicated, and tooling cost is higher, the requirement that its finished product chain obdurability does not reach the mining chain of high strength.
Summary of the invention
In order to overcome the shortcoming that prior art exists, the production technique that the purpose of this invention is to provide the mining chain wire rod of a kind of high strength, make chain factory can adopt comparatively simple explained hereafter to go out the mining chain of high-quality high strength, but and because material cold working, energy consumption is low, production efficiency is high, and production cost reduces significantly.
The objective of the invention is to be achieved through the following technical solutions:
The production technique of a kind of high strength is mining chain wire rod, it is characterized in that: this production technique comprises following operation: blank check, steel billet heating, high-pressure water descaling, roll in thick and pre-finish rolling, water-cooled 1 district, finish rolling, water-cooled 2 districts, subtract fixed diameter rolling, water-cooled 3 districts, weave silk, air-cooled, go into cover cap, slow cooling, go out cover cap, collect volume, finishing, packing put in storage, obtains the mining chain wire rod of high strength;
In the blank inspection process, billet surface does not allow and connects base, crackle, depression, shake trace, pit defective, guarantees into the stove blank surface up-to-standard; The steel billet chemical ingredients requires as follows: C0.2-0.25%, Mn0.7-0.9%, Si0.15-0.35%, P≤0.035%, S≤0.035%, Cr0.4-0.6%, Ni0.4-0.7%, Cu≤0.2%, Mo0.1-0.25%, V≤0.02%, Alt0.015-0.045%, and all the other are Fe;
In the steel billet heating process, the soaking zone temperature is controlled at 1080～1120 ℃;
In the high-pressure water descaling operation, de-scaling pressure is set at 16MPa～20MPa, and red steel temperature is 1040～1080 ℃ after the de-scaling; Strict control de-scaling pressure is guaranteed scale removal effect;
Roll in thick and pre-finish rolling operation in, the roughing start rolling temperature is 1000～1050 ℃, it is 1000～1050 ℃ that pre-finish rolling goes out lipstick steel temperature;
In the finish rolling operation, temperature in is between 900～940 ℃;
Subtract in the fixed diameter rolling operation, temperature in is between 800～840 ℃;
In the operation of weaving silk, laying temperature is between 800～850 ℃;
Go in the cover cap operation, going into the cover cap temperature is 680～700 ℃;
In the slow cooling operation, speed of cooling is 0.6～0.8 ℃/S.
Among the present invention, in water-cooled 1 district, water-cooled case pressure is 1.0-4.0bar, and flow is 1000-3000lpm; In water-cooled 2 districts, water-cooled case pressure is 1.0-4.0bar, and flow is 1000-3000lpm; In water-cooled 3 districts, water-cooled case pressure is 1.0-4.0bar, and flow is 1000-3000lpm.
In the blank inspection process, remove the blank surface iron scale by shotblasting machine, by the magnetic powder detection steel billet surface defect, wherein caving in, shake trace, pit depth of defect reaches the above directly inspection rejects of 2mm and handles, 2mm adopts some mill or the mode of stripping off the skin to handle with interior defective, guarantees into the stove blank surface up-to-standard.
The technological process of production of the present invention is: roll, pre-finish rolling is rolling → water-cooled 1 district → finishing train → water-cooled 2 districts → subtract fixed diameter rolling → water-cooled 3 districts → weave silk → air-cooled → go into cover cap → slow cooling → go out cover cap → collection volume → inspection after construction → finishing → weigh → pack → put in storage in the blank check → steel billet heating → high-pressure water descaling → thick.
Collection was rolled up after wire rod went out cover cap, be transported to the PF line by coil stripping car, finished surface quality and dimensional precision are checked by dish, final dimension tolerance and out of roundness are by the control of GB B class precision, defectives such as that finished surface does not allow is folding, crackle, the ears or side handles of a utensil, the surface tear depth of defect does not allow above 7.
The finishing of finished product wire rod, weigh after, adopt the bagging mode to pack, use soft lifting device simultaneously, avoid producing scratch in sign indicating number heap, the transport process.
The present invention adopts cooling controlling and rolling controlling process, mining chain wire rod is carried out process control, obtain the F+P tissue of suitable chain processing, possesses good comprehensive mechanical properties, only need to adopt simple process just can produce chain, energy consumption is low, low equipment investment, production efficiency height, can reduce production costs significantly.
Compared with prior art, chemical composition stability of the present invention, plasticity and toughness are good, and can be cold worked into chain ring, low cost of manufacture.
Embodiment
Embodiment 1
In this mining chain wire rod production process of Ф 6.5mm specification, blank is tested, remove the blank surface iron scale by shotblasting machine, by the magnetic powder detection steel billet surface defect, blank surface is up-to-standard.Chemical ingredients such as table 1:
Table 1
| C | Mn | Si | P、S | Cr | Ni | Cu | Mo | V | Alt |
| 0.229 | 0.756 | 0.254 | ≤0.02 | 0.515 | 0.524 | 0.08 | 0.176 | ≤0.01 | 0.025 |
In the steel billet heating process, the furnace atmosphere of strict control process furnace preheating section, 1 section of heating, 2 sections of heating, soaking zone, the soaking zone temperature is controlled at 1092～1112 ℃.
In the high-pressure water descaling operation, strict control de-scaling pressure is guaranteed scale removal effect, and de-scaling pressure is set at 18MPa～20MPa, and red steel temperature is 1048～1062 ℃ after the de-scaling.
Roll in thick, in the pre-finish rolling operation, strict control roughing start rolling temperature, start rolling temperature is 1011～1046 ℃, it is 1013～1045 ℃ that pre-finish rolling goes out lipstick steel temperature.
In the finish rolling operation, by regulating the pressure and the flow of water-cooled 1 district's ice chest water coolant, strict control finishing mill temperature in.Ice chest pressure is 1.8bar, and flow is 1245lpm, and the finishing mill temperature in is 925 ℃.
Subtract in the fixed diameter rolling operation, by regulating the pressure and the flow of water-cooled 2 district's water-cooled case water coolants, strict control reducing sizing mill temperature in.Water-cooled case pressure is 1.8bar, and flow is 1458lpm, and subtracting the sizing temperature in is 825 ℃.
In the operation of weaving silk, by regulating the pressure and the flow of water-cooled 3 district's water-cooled case water coolants, strict control laying temperature.Water-cooled case pressure is 1.9bar, and flow is 1986lpm, and laying temperature is 830 ℃.
In the air-cooled operation, one section roller table speed of air-cooled line is set at 20rpm, opens the 1# cooling blower, and air quantity is opened the 1-2# insulation shroud for being set at 30%, and the cover cap temperature is gone in strict control, and going into the cover cap temperature is 695 ℃.
In the slow cooling operation, air-cooled line roller-way increasing ratio is set at 3%, the speed of cooling of strict control wire rod in insulation shroud, and speed of cooling is 0.7 ℃/S.
Collection was rolled up after wire rod went out cover cap, was transported to the PF line by coil stripping car, and the inspection man checks by dish finished surface quality and dimensional precision, and the final dimension tolerance is ± 0.2mm that out of roundness is≤0.3mm defectives such as finished surface does not fold, crackle, the ears or side handles of a utensil, scuffing.
The finishing of finished product wire rod, weigh after, adopt the bagging mode to pack, use soft lifting device simultaneously, avoid producing scratch in sign indicating number heap, the transport process.
By adopting above production technique, this mining chain wire rod chemical composition stability of 6.5mm specification, tissue and comprehensive mechanical property are good, and detected result sees Table 2:
Table 2
Embodiment 2
In this mining chain wire rod production process of Ф 12mm specification, blank is tested, remove the blank surface iron scale by shotblasting machine, by the magnetic powder detection steel billet surface defect, blank surface is up-to-standard.Chemical ingredients such as table 3:
Table 3
| C | Mn | Si | P、S | Cr | Ni | Cu | Mo | V | Alt |
| 0.235 | 0.762 | 0.264 | ≤0.02 | 0.566 | 0.531 | 0.08 | 0.181 | ≤0.01 | 0.023 |
In the steel billet heating process, the furnace atmosphere of strict control process furnace preheating section, 1 section of heating, 2 sections of heating, soaking zone, the soaking zone temperature is controlled at 1095～1110 ℃.
In the high-pressure water descaling operation, strict control de-scaling pressure is guaranteed scale removal effect, and de-scaling pressure is set at 18MPa～20MPa, and red steel temperature is 1045～1060 ℃ after the de-scaling.
Roll in thick, in the pre-finish rolling operation, strict control roughing start rolling temperature, start rolling temperature is 1010～1045 ℃, it is 1010～1040 ℃ that pre-finish rolling goes out lipstick steel temperature.
In the finish rolling operation, by regulating the pressure and the flow of water-cooled 1 district's water-cooled case water coolant, strict control finishing mill temperature in.Water-cooled case pressure is 2.0bar, and flow is 1460lpm, and the finishing mill temperature in is 930 ℃.
Subtract in the fixed diameter rolling operation, by regulating the pressure and the flow of water-cooled 2 district's water-cooled case water coolants, strict control reducing sizing mill temperature in.Water-cooled case pressure is 2.0bar, and flow is 1650lpm, and subtracting the sizing temperature in is 815 ℃.
In the operation of weaving silk, by regulating the pressure and the flow of water-cooled 3 district's water-cooled case water coolants, strict control laying temperature.Water-cooled case pressure is 2.0bar, and flow is 2150lpm, and laying temperature is 820 ℃.
In the air-cooled operation, one section roller table speed of air-cooled line is set at 24rpm, opens 1#, 2# cooling blower, and air quantity is opened the 1-6# insulation shroud for being set at 50%, 30%, and the cover cap temperature is gone in strict control, and going into the cover cap temperature is 685 ℃.
In the slow cooling operation, air-cooled line roller-way increasing ratio is set at 4%, the speed of cooling of strict control wire rod in insulation shroud, and speed of cooling is 0.72 ℃/S.
Collection was rolled up after wire rod went out cover cap, be transported to the PF line by coil stripping car, the inspection man checks by dish finished surface quality and dimensional precision, and the final dimension tolerance is ± 0.25mm, out of roundness is≤0.4mm defectives such as finished surface is not folding, crackle, the ears or side handles of a utensil, scuffing.
The finishing of finished product wire rod, weigh after, adopt the bagging mode to pack, use soft lifting device simultaneously, avoid producing scratch in sign indicating number heap, the transport process.
By adopting above production technique, this mining chain wire rod chemical composition stability of 12mm specification, tissue and comprehensive mechanical property are good, and detected result sees Table 4:
Table 4
Embodiment 3
In this mining chain wire rod production process of Ф 18mm specification, blank is tested, remove the blank surface iron scale by shotblasting machine, by the magnetic powder detection steel billet surface defect, blank surface is up-to-standard.Chemical ingredients such as table 5:
Table 5
| C | Mn | Si | P、S | Cr | Ni | Cu | Mo | V | Alt |
| 0.238 | 0.774 | 0.272 | ≤0.02 | 0.583 | 0.552 | 0.06 | 0.175 | ≤0.01 | 0.021 |
In the steel billet heating process, the furnace atmosphere of strict control process furnace preheating section, 1 section of heating, 2 sections of heating, soaking zone, the soaking zone temperature is controlled at 1092～1114 ℃.
In the high-pressure water descaling operation, strict control de-scaling pressure is guaranteed scale removal effect, and de-scaling pressure is set at 18MPa～20MPa, and red steel temperature is 1046～1066 ℃ after the de-scaling.
Roll in thick, in the pre-finish rolling operation, strict control roughing start rolling temperature, start rolling temperature is 1012～1048 ℃, it is 1012～1043 ℃ that pre-finish rolling goes out lipstick steel temperature.
In the finish rolling operation, by regulating the pressure and the flow of water-cooled 1 district's water-cooled case water coolant, strict control finishing mill temperature in.Water-cooled case pressure is 2.5bar, and flow is 1840lpm, and the finishing mill temperature in is 820 ℃.
Subtract in the fixed diameter rolling operation, by regulating the pressure and the flow of water-cooled 2 district's water-cooled case water coolants, strict control reducing sizing mill temperature in.Water-cooled case pressure is 2.8bar, and flow is 1850lpm, subtracts 810 ℃ of sizing temperature ins.
In the operation of weaving silk, by regulating the pressure and the flow of water-cooled 3 district's water-cooled case water coolants, strict control laying temperature.Water-cooled case pressure is 3.0bar, and flow is 2550lpm, and laying temperature is 820 ℃.
In the air-cooled operation, one section roller table speed of air-cooled line is set at 28rpm, opens 1#, 2#, 3# cooling blower, and air quantity is opened the 1-10# insulation shroud for being set at 80%, 50%, 30%, and the cover cap temperature is gone in strict control, and going into the cover cap temperature is 680 ℃.
In the slow cooling operation, air-cooled line roller-way increasing ratio is set at 5%, the speed of cooling of strict control wire rod in insulation shroud, and speed of cooling is 0.75 ℃/S.
Collection was rolled up after wire rod went out cover cap, be transported to the PF line by coil stripping car, the inspection man checks by dish finished surface quality and dimensional precision, and the final dimension tolerance is ± 0.3mm, out of roundness is≤0.48mm defectives such as finished surface is not folding, crackle, the ears or side handles of a utensil, scuffing.
The finishing of finished product wire rod, weigh after, adopt the bagging mode to pack, use soft lifting device simultaneously, avoid producing scratch in sign indicating number heap, the transport process.
By adopting above production technique, this mining chain wire rod chemical composition stability of 18mm specification, tissue and comprehensive mechanical property are good, and detected result sees Table 6:
Table 6
The present invention adopts cooling controlling and rolling controlling process, obtains the F+P tissue of suitable chain processing, possesses good comprehensive mechanical properties, and plasticity and toughness are good, and can be cold worked into chain ring, low cost of manufacture.The performance of the present invention and 25MnVB circular chain steel wire rod relatively sees Table 7:
Table 7
Claims (3)
1. the production technique of the mining chain wire rod of high strength, it is characterized in that: this production technique comprises following operation: blank check, steel billet heating, high-pressure water descaling, roll in thick and pre-finish rolling, water-cooled 1 district, finish rolling, water-cooled 2 districts, subtract fixed diameter rolling, water-cooled 3 districts, weave silk, air-cooled, go into cover cap, slow cooling, go out cover cap, collect volume, finishing, packing put in storage, obtains the mining chain wire rod of high strength;
In the blank inspection process, billet surface does not allow and connects base, crackle, depression, shake trace, pit defective, guarantees into the stove blank surface up-to-standard; The steel billet chemical ingredients requires as follows: C0.2-0.25%, Mn0.7-0.9%, Si0.15-0.35%, P≤0.035%, S≤0.035%, Cr0.4-0.6%, Ni0.4-0.7%, Cu≤0.2%, Mo0.1-0.25%, V≤0.02%, Alt0.015-0.045%, and all the other are Fe;
In the steel billet heating process, the soaking zone temperature is controlled at 1080～1120 ℃;
In the high-pressure water descaling operation, de-scaling pressure is set at 16MPa～20MPa, and red steel temperature is 1040～1080 ℃ after the de-scaling;
Roll in thick and pre-finish rolling operation in, the roughing start rolling temperature is 1000～1050 ℃, it is 1000～1050 ℃ that pre-finish rolling goes out lipstick steel temperature;
In the finish rolling operation, temperature in is between 900～940 ℃;
Subtract in the fixed diameter rolling operation, temperature in is between 800～840 ℃;
In the operation of weaving silk, laying temperature is between 800～850 ℃;
Go in the cover cap operation, going into the cover cap temperature is 680～700 ℃;
In the slow cooling operation, speed of cooling is 0.6～0.8 ℃/S.
2. the production technique of the mining chain wire rod of high strength according to claim 1 is characterized in that: in water-cooled 1 district, water-cooled case pressure is 1.0-4.0bar, and flow is 1000-3000lpm; In water-cooled 2 districts, water-cooled case pressure is 1.0-4.0bar, and flow is 1000-3000lpm; In water-cooled 3 districts, water-cooled case pressure is 1.0-4.0bar, and flow is 1000-3000lpm.
3. the production technique of the mining chain wire rod of high strength according to claim 1, it is characterized in that: in the blank inspection process, remove the blank surface iron scale by shotblasting machine, by the magnetic powder detection steel billet surface defect, wherein caving in, shake trace, pit depth of defect reaches the above directly inspection rejects of 2mm and handles, 2mm adopts some mill or the mode of stripping off the skin to handle with interior defective, guarantees into the stove blank surface up-to-standard.
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| CN111530923B (en) * | 2020-04-30 | 2021-10-01 | 江苏省沙钢钢铁研究院有限公司 | Production process of high-carbon steel wire rod |
| CN112077140A (en) * | 2020-09-04 | 2020-12-15 | 南京钢铁股份有限公司 | Control method for reducing extrusion damage to surface of wire spring steel |
| CN112275811A (en) * | 2020-09-10 | 2021-01-29 | 江阴兴澄合金材料有限公司 | Control method for improving coil shape and reducing coil height of high-speed wire |
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