Round steel slitting and rolling process
Through the round steel cutting and rolling process, the problems of low efficiency, high cost and difficult to control in traditional processes are solved, and high-efficiency and low energy consumption of high-quality round steel production is achieved to meet market demand and meet environmental protection requirements.
Patent Information
- Application Number
- CN202510270221.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2025-07-11
AI Technical Summary
The traditional round steel production process is lengthy, low efficiency and high cost, difficult to control product accuracy and high scrap rate, difficult to meet the market's efficient and high-quality supply needs, and the pressure on environmental protection and energy-saving in the steel industry has increased.
The round steel cutting and rolling process is adopted, including casting billet inspection, furnace heating, descaling, cutting and rolling, sawing, cold bed processing, slow cooling and finished product inspection. Through precise hole design and rolling mill parameter control, synchronous cutting and precise control of the blanks are achieved, combined with reasonable temperature control and cooling control technology, the quality of the finished product is ensured.
Significantly improve equipment production capacity, shorten rolling cycle, reduce waste rate and energy consumption, improve the dimensional accuracy and mechanical properties of finished products, meet high-end manufacturing needs, and help enterprises meet environmental standards.
Smart Images
Figure CN120286532A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of round steel processing, and particularly relates to a round steel split rolling process. Background Art
[0002] Traditional round steel production mostly adopts conventional rolling, with single billets being rolled successively. The process is long and inefficient; the equipment runs for a long time, consumes a large amount of energy, and the production cost is high. Moreover, frequent single-rod rolling easily causes dimensional deviations, it is difficult to control the product precision, and the rejection rate is often between 5% and 10%. With the booming development of construction and machinery manufacturing, the demand for round steel has increased. The traditional process is difficult to meet the market's demand for high-efficiency and high-quality supply; at the same time, the environmental protection and energy-saving pressure in the steel industry has increased sharply, and there is an urgent need to innovate the process to reduce energy consumption and improve efficiency. Summary of the Invention
[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a round steel split rolling process, which can solve the problem that the traditional process is difficult to meet the market's demand for high-efficiency and high-quality supply.
[0004] To achieve the above purpose, the present invention provides the following technical solution: A round steel split rolling process, characterized in that: it includes the following specific process steps, S1: Inspect and store the continuous casting billets. The raw material of 150*150 square billet is used to produce the specification range: 50-60mm specifications; the raw material of 280*280 square billet is used to produce the specification range: 60-120mm specifications; the raw material of 240*240 large square billet is used to produce the specification range: 55-90mm specifications; the raw material of 350*430 large square billet is used to produce the specification range: 85-220mm specifications;
[0005] S2: Charge into the furnace for heating and descaling: The heating system is executed according to the requirements of Table 1. The temperature and time of each section of the heating furnace are as required in Table 1:
[0006] Strictly execute according to the heating system requirements of Table 1, control the heating temperature and time well. If the accident time is greater than 20 minutes, the heating temperature should be reduced in time;
[0007] During the rolling process, turn on the 1# high-pressure water descaling, and the descaling working pressure is set not less than 12 Mpa. To ensure the descaling effect of the high-pressure water descaling, it is necessary to confirm the descaling pressure when taking over the shift;
[0008]
[0009]
[0010] Table 1
[0011] S3 Rolling: The split rolling method is adopted. The special split rolling wheel is installed at the entrance of the finishing mill. At the moment when the "dumbbell" billet is bitten, it is cut into two round billets with a diameter by virtue of high-speed rotation and precise angle. During the splitting process, the mill speed is adjusted slightly to match, so as to maintain the synchronous advancement of the two billets. The temperature is stabilized at 900 - 950 °C to ensure smooth cut and no burrs.
[0012] Among them, for the hot dimensions, shape, camber, weight and allowable deviations, the dimensions, shape, camber, weight and allowable deviations of the steel should comply with the provisions of Group 2 in EN10060 or GB / T702 - 2017. The out-of-roundness of the hot-rolled round steel should comply with the provisions in EN10060 or GB / T702 - 2017. See Table 2 for details.
[0013]
[0014] Table 2
[0015] S4 Sawing: The lengths of the head and tail sawn by the hot saw should be strictly carried out in accordance with the requirements of the operating procedures. The length can be increased but must not be shorter than the required length.
[0016] S5 Cooling Bed: The finishing team arranges personnel to check the sawing situation at the tail on the cooling bed every hour. If the sawing is not clean, the sawing length of the corresponding batch should be increased by 50 - 200 mm.
[0017] S6 In-pit Slow Cooling: The round steel enters the insulation cover for slow cooling. The dynamic tooth cycle time in the insulation cover is adjusted according to the production rhythm, and the offline collection temperature is controlled at about 300 - 450 °C. After the round steel exits the insulation cover, it is quickly collected on the cooling bed and bundled. The slow cooling time is not less than 24 hours.
[0018] S7 Grinding: Evaluate the processed round steel to judge whether the performance and surface are qualified. If it is unqualified and cannot be saved or ground, it is directly scrapped. If it can be saved or ground, grinding is carried out.
[0019] S8 Finished Product Inspection: Inspect the performance and surface quality of the processed finished products. The finished products that pass the inspection are warehoused and waiting for shipment.
[0020] Preferably, for the said S2 Furnace Charging and Descaling: Do not charge and roll continuously with CrMo gear steel during furnace charging.
[0021] Ensure the overall temperature of the continuous casting billet is uniform to prevent visible yin-yang surfaces. If the yin-yang surfaces are obvious, stop rolling immediately and wait for the temperature. Increase the gas volume of the lower burner to make the temperature normal before tapping.
[0022] Preferably, for the said S3 Rolling: The starting rolling temperature ≥ 1000 °C, the finishing rolling temperature ≥ 850 °C. Before the first pass of 800 rolling, it should be turned over first, and the four-pass descaling process is adopted for rolling. After 800 rolling, continuous rolling is carried out.
[0023] Preferably, for the S3 rolling: the shearing length of the 400t shear shall be carried out according to the operating procedures. When producing bloom, the 400t shear must cut off the head fish-tail defects cleanly.
[0024] Preferably, for the S3 rolling: during shift handover inspection and intermediate shutdown, the wear condition of the roll grooves shall be checked, whether there are serious cracks and flesh loss; whether the cooling water pipe nozzles are aligned with the roll grooves and whether the connecting rubber hoses are leaking; check whether the guides are centered, whether there is iron clamping, wire drawing, and whether the guide rollers are stuck. In case of any abnormality, stop the machine in time for treatment or replacement.
[0025] Preferably, for the S3 rolling: during the rolling process, the stock shape dimensions and burning marks of each stand shall be measured every hour to prevent the occurrence of ears.
[0026] Preferably, for the S7 grinding: during grinding, it is required to grind off the burrs, folds, ears, scratches, cracks, burrs and flash defects on the surface of the finished product cleanly.
[0027] Preferably, for the S3 rolling: the places with sharp corners and burrs on the roll grooves, baffles, guides and roller tables must be polished clean. Those that cannot be polished clean must be replaced in time.
[0028] Preferably, for the S3 rolling: during roll change and shift handover, the roll grooves of the 800 rolling mill shall be checked for serious wear and flesh loss. Pay special attention to checking the surface of the pusher and the "vertical rolls" to avoid scratching and abrasion of the red-hot steel surface by the pusher, resulting in intermittent and superficial folding defects on the surface of the finished product.
[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0030] 1. For this round steel split rolling process, in this process, the billet is split into two parts for synchronous processing, the equipment production capacity is increased by 80%-100%, the rolling cycle is greatly reduced, which meets the delivery of large-scale orders and enhances the enterprise's market response ability. The precise pass design and rolling mill parameter regulation in each link reduce the diameter tolerance of the round steel to ±0.3mm, and the finished product size accuracy far exceeds the traditional process. The scrap rate drops directly to 1%-2%, reducing raw material waste. Due to the compact rolling process and less idle time of the equipment, the energy consumption per unit output is reduced by 30%-40%, which meets the development trend of green steel, helps the enterprise meet environmental protection standards while reducing costs. The reasonable rolling temperature control and controlled cooling process refine the grains, increasing the yield strength of the round steel by 10%-15% and optimizing the elongation by 8%-12%, meeting the strict mechanical property requirements of high-end manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] The present invention will be further described below with reference to the drawings and embodiments:
[0032] Figure 1 It is a schematic process flow diagram of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0033] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The function of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention. However, it should not be construed as a limitation on the protection scope of the present invention.
[0034] In the description of the present invention, it should be understood that for the orientation description, such as the upper, lower, front, rear, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present invention.
[0035] In the description of the present invention, "greater than", "less than", "exceeding", etc. are understood as not including the number itself, and "above", "below", "within", etc. are understood as including the number itself. If the first and second are described, it is only for the purpose of distinguishing technical features and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.
[0036] In the description of the present invention, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.
[0037] Please refer to Figure 1 , the present invention provides a technical solution: a round steel splitting rolling process, including the following specific process steps. S1: Inspect and store the billets. Use 150*150 square billet raw materials to produce specifications in the range of 50~60mm; use 280*280 square billet raw materials to produce specifications in the range of 60~120mm; use 240*240 large square billet raw materials to produce specifications in the range of 55~90mm; use 350*430 large square billet raw materials to produce specifications in the range of 85~220mm. S2: Furnace heating and descaling: The heating system shall be executed according to the requirements in Table 1. The temperature and time of each section of the heating furnace are as required in Table 1: Strictly execute according to the heating system requirements in Table 1, and control the heating temperature and time. If the accident time is greater than 20 minutes, the heating temperature should be reduced in time; Do not continuously charge and roll with CrMo gear steel when charging into the furnace; Ensure that the overall temperature of the billet is uniform to prevent visible yin-yang surfaces. If the yin-yang surfaces are obvious, stop rolling immediately and wait for the temperature. Increase the gas volume of the lower uniform burner, and only tap the steel after the temperature returns to normal; During the rolling process, turn on the high-pressure water descaling of No. 1. The descaling working pressure is set to be not less than 12 Mpa. To ensure the descaling effect of the high-pressure water descaling, it is necessary to confirm the descaling pressure when taking over the shift;
[0044]
[0045] Table 1
[0046] S3 rolling: The split rolling method is adopted for splitting. The special split wheel is installed at the entrance of the finishing mill. At the moment when the "dumbbell" billet is bitten, it is split into two equal-diameter round billets by virtue of high-speed rotation and precise angle; during the splitting process, the speed of the rolling mill is adjusted slightly to match, and the two billets are maintained to move forward synchronously; the temperature is stabilized at 900-950 °C to ensure that the cut is flat and free of burrs;
[0047] Among them, for the hot dimensions, shapes, cambers, weights and allowable deviations, the dimensions, shapes, cambers, weights and allowable deviations of the steel should comply with the provisions of Group 2 in EN10060 or GB / T702-2017. The out-of-roundness of the hot-rolled round steel should comply with the provisions in EN10060 or GB / T702-2017. See Table 2 for details;
[0048] The starting rolling temperature ≥ 1000 °C, the finishing rolling temperature ≥ 850 °C. Before the first pass of 800 rolling, the billet should be turned over first, and the four-pass descaling process should be adopted for rolling. After 800 rolling, continuous rolling should be carried out;
[0049] Among them, the places with sharp corners and burrs on the rolling grooves, baffles, guides, and roller tables must be polished clean. Those that cannot be polished clean must be replaced in time;
[0050] Among them, when changing rolls and taking over the shift, the roll grooves of the 800 rolling mill should be checked to see if there are serious wear, meat loss, etc. Pay special attention to checking the surface of the pusher and the "vertical rolls" to avoid scratches and abrasions on the surface of the red-hot steel by the pusher, resulting in defects such as intermittent and superficial folds on the surface of the finished product;
[0051] Among them, the shearing length of the 400t shear should be carried out according to the operating procedures. When producing large square billets, the 400t shear must cut off the head fish-tail defects;
[0052] Among them, during the shift inspection and during the mid-course shutdown, the wear condition of the rolling grooves should be checked, whether there are relatively serious cracks and meat loss; whether the cooling water pipe nozzles are aligned with the rolling grooves, whether the connecting rubber hoses are leaking, etc.; check whether the guides are centered, whether there is iron clamping, wire drawing, and whether the guide rollers are stuck. If any abnormalities are found, stop the machine in time for treatment or replacement;
[0053] Among them, during the rolling process, the shape dimensions of each stand and the burning marks should be measured every hour to prevent the occurrence of ears.
[0054]
[0055]
[0056] Table 2
[0057] S4 Sawing: The sawing length of the head and tail by the hot saw should be strictly carried out in accordance with the requirements of the operating procedures. The length can be increased, but it must not be shorter than the required length.
[0058] S5 Cooling Bed: The finishing team arranges personnel to check the sawing situation at the tail of the cooling bed every hour. If there is any unclean sawing, the sawing length of the corresponding batch should be increased by 50 - 200 mm.
[0059] S6 In-pit Slow Cooling: The round steel enters the insulation cover for slow cooling. When in the insulation cover, the dynamic tooth cycle time is adjusted according to the production rhythm, and the outgoing collection temperature is controlled at about 300 - 450 °C. After the round steel exits the insulation cover, it is quickly collected on the cooling bed for bundling, and the slow cooling time is not less than 24 hours.
[0060] S7 Grinding: Evaluate the processed round steel to judge whether the performance and surface are qualified. If it is unqualified and cannot be saved or ground, it is directly scrapped. If it can be saved or ground, grinding is carried out.
[0061] Among them, during grinding, it is required to grind clean the defects such as burrs, folds, ears, scratches, cracks, burrs, and flash on the surface of the finished product.
[0062] S8 Finished Product Inspection: Inspect the performance and surface quality of the processed finished product. After passing the inspection, the finished product is warehoused and waiting for shipment.
[0063] Furthermore, in this process of split rolling, the billet is divided into two parts for synchronous processing, the equipment production capacity is increased by 80% - 100%, the rolling cycle is significantly reduced, which meets the delivery of large-scale orders and enhances the enterprise's market response ability. The precise pass design and rolling mill parameter regulation in each link reduce the diameter tolerance of the round steel to ±0.3 mm, and the finished product size accuracy far exceeds the traditional process. The scrap rate drops directly to 1% - 2%, reducing raw material waste. Due to the compact rolling process and less idle time of the equipment, the energy consumption per unit output is reduced by 30% - 40%, which meets the development trend of green steel, helps the enterprise meet environmental protection standards while reducing costs. The reasonable control of rolling temperature and controlled cooling process refine the grains, increasing the yield strength of the round steel by 10% - 15% and optimizing the elongation by 8% - 12%, meeting the strict mechanical property requirements of high-end manufacturing.
[0064] Furthermore, the finished products produced by this process are of reliable quality. Through multiple rounds of quality control and in combination with grinding treatment, defective products are prevented from entering the market. The products are highly durable and stable, helping the enterprise build a high-quality brand image and expand its high-end customer base.
[0065] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the spirit of the present invention.
Claims
1. A round steel splitting rolling process, characterized in that: It includes the following specific process steps. S1: Inspection and warehousing of continuous casting billets. The raw materials are 150*150 square billets, and the production specification range is 50 - 60 mm; the raw materials are 280*280 square billets, and the production specification range is 60 - 120 mm; the raw materials are 240*240 large square billets, and the production specification range is 55 - 90 mm; the raw materials are 350*430 large square billets, and the production specification range is 85 - 220 mm. S2: Heating in the furnace and descaling: The heating system is executed according to the requirements in Table 1. The temperature and time of each section of the heating furnace are as required in Table 1. Strictly execute according to the heating system requirements in Table 1, control the heating temperature and time well. In case the accident time is more than 20 minutes, the heating temperature should be reduced in time. During the rolling process, turn on the 1# high-pressure water descaling. The descaling working pressure is set to be not less than 12 Mpa. To ensure the descaling effect of high-pressure water descaling, it is necessary to confirm the descaling pressure when taking over the shift. Table 1 S3: Rolling: The split wheel method is adopted for splitting. The special split wheel is installed at the entrance of the finishing mill. At the moment of biting the "dumbbell" billet, it is split into two round billets with a circular cross-section by virtue of high-speed rotation and precise angle. During the splitting process, the rolling mill speed is adjusted finely to maintain the synchronous advancement of the two billets. The temperature is stabilized at 900 - 950 °C to ensure that the cut is flat and without burrs. Among them, for the hot dimensions, shape, camber, weight and allowable deviations, the dimensions, shape, camber, weight and allowable deviations of the steel should comply with the provisions of Group 2 in EN10060 or GB / T702 - 2017. The out-of-roundness of the hot-rolled round steel should comply with the provisions in EN10060 or GB / T702 - 2017. See Table 2 for details. Table 2 S4: Sawing: The length of the head and tail sawed by the hot saw should be strictly executed according to the operating procedures requirements. The length can be increased but must not be shorter than the required length. S5: Cooling bed: The finishing team arranges personnel to check the sawing situation at the tail of the cooling bed every hour. If there is any that is not sawed cleanly, the sawing length of the corresponding batch should be increased by 50 - 200 mm. S6: Slow cooling in the pit: The round steel enters the heat preservation cover for slow cooling. When in the heat preservation cover, the dynamic tooth cycle time is adjusted according to the production rhythm, and the temperature for offline collection is controlled at about 300 - 450 °C. After the round steel exits the heat preservation cover, it is quickly taken off the cooling bed for collection and bundling. The slow cooling time is not less than 24 hours. S7: Grinding: Evaluate the processed round steel to judge whether the performance and surface are qualified. If it is unqualified and cannot be saved or ground, it is directly judged as scrap. If it can be saved or ground, grinding is carried out. S8: Final product inspection: Inspect the performance and surface quality of the processed final product. After passing the inspection, the final product is warehoused for shipment.
2. The round steel splitting rolling process according to claim 1, characterized in that: For the above-mentioned S2: Heating in the furnace and descaling: Do not load and roll continuously with CrMo gear steel when charging the furnace. Ensure the overall temperature of the continuous casting billet is uniform to prevent the appearance of visible yin-yang surfaces. If the yin-yang surfaces are obvious, rolling should be stopped immediately to wait for the temperature. Increase the gas volume of the equalizing burner until the temperature is normal before tapping the steel.
3. A round steel splitting rolling process according to claim 1, characterized in that: For the above-mentioned S3: Rolling: The starting rolling temperature ≥ 1000 °C, the finishing rolling temperature ≥ 850 °C. Before the first pass of rolling at 800, it should be turned over first, and the four-pass descaling process is adopted for rolling. After rolling at 800, continuous rolling is carried out.
4. A round steel splitting rolling process according to claim 1, characterized in that: The S3 rolling: The shearing length of the 400t shears shall be carried out in accordance with the operating procedures. When producing bloom, the 400t shears must cut off the head fish-tail defects cleanly.
5. A round steel splitting rolling process according to claim 1, characterized in that: The S3 rolling: During shift handover inspection and during mid-course shutdown, the wear condition of the roll grooves shall be checked, for any serious cracks or flesh loss; whether the cooling water pipe nozzles are aligned with the roll grooves and whether the connecting rubber hoses are leaking; check whether the guide devices are centered, whether there is iron clamping, wire drawing, or the guide rollers are jammed. In case of any abnormality, stop the machine in time for handling or replacement.
6. A round steel splitting rolling process according to claim 1, characterized in that: The S3 rolling: During the rolling process, the shape dimensions of each stand and the burning marks shall be measured every hour to prevent the occurrence of ears.
7. A round steel splitting rolling process according to claim 1, characterized in that: The S7 grinding: During grinding, it is required to grind clean the burrs, folds, ears, scratches, cracks, burrs, and flash defects on the surface of the finished product.
8. A round steel splitting rolling process according to claim 1, characterized in that: The S3 rolling: The places with sharp corners and burrs on the roll grooves, baffles, guide devices, and roller tables must be ground clean. Those that cannot be ground clean must be replaced in time.
9. A round steel splitting rolling process according to claim 1, characterized in that: The S3 rolling: When changing rolls and during shift handover, the roll grooves of the 800 rolling mill shall be checked for any serious wear or flesh loss. Pay special attention to checking the surface of the pusher and the "vertical rolls" to avoid scratching and abrasion of the red-hot steel surface by the pusher, resulting in intermittent and superficial folding defects on the surface of the finished product.