CN115351088A - Process for producing hot-rolled round pipe blank by using short-stress two-roll mill - Google Patents
Process for producing hot-rolled round pipe blank by using short-stress two-roll mill Download PDFInfo
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- CN115351088A CN115351088A CN202210939671.9A CN202210939671A CN115351088A CN 115351088 A CN115351088 A CN 115351088A CN 202210939671 A CN202210939671 A CN 202210939671A CN 115351088 A CN115351088 A CN 115351088A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 45
- 239000010959 steel Substances 0.000 claims abstract description 45
- 238000005096 rolling process Methods 0.000 claims abstract description 35
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000000446 fuel Substances 0.000 claims abstract description 11
- 238000002791 soaking Methods 0.000 claims abstract description 4
- 230000008093 supporting effect Effects 0.000 claims abstract description 4
- 238000010008 shearing Methods 0.000 claims description 38
- 239000007789 gas Substances 0.000 claims description 16
- 238000005520 cutting process Methods 0.000 claims description 10
- 238000005516 engineering process Methods 0.000 claims description 8
- 238000005098 hot rolling Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000003546 flue gas Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 229910001149 41xx steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/14—Guiding, positioning or aligning work
- B21B39/16—Guiding, positioning or aligning work immediately before entering or after leaving the pass
- B21B39/165—Guides or guide rollers for rods, bars, rounds, tubes ; Aligning guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
Abstract
The invention discloses a process for producing a hot-rolled round pipe blank by a short-stress two-roll mill, which selects No. 45 steel, and adopts a heating system as follows: the air-fuel ratio is 2.0-2.2, the heating section is less than or equal to 1200 ℃, the soaking section is less than or equal to 1150 ℃, the initial rolling temperature is 1000 +/-15 ℃, and the bed temperature is less than or equal to 950 ℃; designing a set of true round hole patterns, wherein the size of a K2 material pattern is close to a circle, changing a rolling process into ellipse-circle, and performing online circle gauge by simulating a KOCKS rolling mill circle gauge principle by using the last three rolling mills; modifying the K1 guide wheel to enable the R arcs of the K2 rolled piece and the K1 guide wheel to be consistent, and when the guide wheel clamps the material model, the material model is completely attached to the guide wheel to enhance the supporting effect; and when the front row guide roller is in a tightening type, the gap of the rear row guide roller is consistent with that of the front row, and the K2 rolled piece is supported by the double rows of guides.
Description
Technical Field
The invention relates to a process for producing a hot-rolled round pipe blank by using a short-stress two-roll mill.
Background
The hot rolling round pipe blank is a blank which is produced by continuously casting a square blank and rolling the square blank for a downstream seamless steel pipe, and usually adopts solid round steel with high quality (or alloy). They are classified into structural tube blanks, conveying tube blanks, bearing tube blanks, boiler tube blanks, etc. according to their downstream uses. The steel grades are 10#, 20#, 35#, 45#, 15Cr, 40Cr, 30CrMnSi, 12CrMoV and the like, and the specification diameter of the finished product is different from phi 45 to 90.
By 150mm 2 The square billet short stress path rolling mill has the following problems in rolling round pipe billets: (1) the total compression ratio is only 7.9 by taking the phi 60 specification as an example, and the grain size structure condition is difficult to guarantee; (2) in domestic steel mills producing hot-rolled round pipe billets, three-roller KOCKS rolling mills or reducing sizing and rounding rolling mills are mostly adopted to ensure the dimensional accuracy of the round pipe billets. The finished products K1 and K2 of the two-roller short stress path rolling mill are rolled in a large rolling mode with large rolling reduction and large width, and the rounding rolling cannot be realized; meanwhile, a loop is arranged between the finishing mill frames, the center distance of the mill is 4.5m, and the shape of the K2 ellipse material is fat, so that shaft error is easily caused by torsion. The size precision of the hot rolling round pipe billet is difficult to control due to the reasons. (3) The finished rolled piece is heavy in weight, and marking defects are easily generated in the apron board roller way transportation and discharging processes; (4) through the checking of the shearing capability, the existing shearing mode of phi 55/60 only supports single shearing, the production efficiency is low, and the quality problems of the sawed sections such as sawed fins, burrs and the like cannot be effectively solved;
and (3) searching documents: (1) Guo Zhaocheng, ledon, zhang Ruifang, tian Yongliang CrMo hot rolled round tube blank trial production clad steel technology, coil 8, month 29, coil 4, year (2) Jiang Chen, li Deyao, song Juntao TDC66 hot rolled round tube blank trial production clad steel technology, month 4, month 46, coil 3, year (3) Lin Hua, xie Kai mean influence of horizontal continuous cast round tube blank intermediate cracks on rolled tube quality steel tube, coil 3, year (4) Wang Sanyun, langxing, an Hongsheng, hu Songshan, jiang Angu, li Weihe hot rolled steel tube continuous cast round tube hot charging system patent application No.: CN201020582665.5 2010.10.28 (5) Huang Hong phi 60mm pipe blank hot rolling process practice Liu Gang technology first phase 2003 (6) Zou Xiyang, shi Qi, yin Qingjin, li Fei an oil casing pipe steel variety and production process invention patent application number: CN103556084A 2014.02.05; as can be seen from the above search documents, no rolling technique for producing hot-rolled round pipe billets having a diameter of less than or equal to phi 60 in a specific shape, producing hot-rolled round pipe billets by a specific rolling mill, or producing seamless steel pipes by using pipe billets has been adopted for producing seamless steel pipes 2 A detailed rolling process technology introduction for rolling a hot-rolled round tube blank by a square billet short stress path rolling mill.
Disclosure of Invention
The invention aims to provide a process for producing a hot-rolled round pipe blank by using a short-stress two-roller rolling mill, which effectively solves the production quality bottleneck problems that the structure crystal grains are large (more than or equal to grade 7), the size precision of a whole strip does not reach the standard, the surface defect is caused, the production efficiency is low and the like.
The invention adopts the technical scheme that a process for producing a hot-rolled round pipe blank by using a short-stress two-roll mill selects No. 45 steel and comprises the following chemical components: 0.17 to 0.37 percent of Si, 0.50 to 0.80 percent of Mn, less than or equal to 0.035 percent of P, 0.42 to 0.50 percent of C, less than or equal to 0.035 percent of S, less than or equal to 0.30 percent of Ni, less than or equal to 0.25 percent of Cr and Cu, and the balance of Fe and impurities; 45# Steel heating System: the air-fuel ratio is 2.0-2.2, the heating section is less than or equal to 1200 ℃, the soaking section is less than or equal to 1150 ℃, the initial rolling temperature is 1000 +/-15 ℃, and the bed temperature is less than or equal to 950 ℃;
heating: the heating furnace presets the ratio of gas and air by taking the heat value of the gas as feedforward, controls the air-fuel ratio, controls the opening of the air and gas valves by utilizing the valve characteristics, controls the air-gas flow along with the change of temperature when the temperature is close to the target temperature, controls the residual oxygen of flue gas as feedback control, corrects the air-fuel ratio in real time, achieves the optimal air-gas ratio, avoids high temperature, is a weak oxidizing atmosphere in the furnace, reduces a decarburizing layer, and ensures that the actual decarburizing layer depth is less than or equal to 0.5 percent;
the hot rolling round pipe blank rounding process is implemented as follows: designing a set of true round hole patterns, wherein the size of the K2 material pattern is close to a circle, changing the rolling process into ellipse-circle, and performing online circle gauge by using the last three rolling mills to simulate the rounding principle of a KOCKS rolling mill; modifying the K1 guide wheel to enable the R arcs of the K2 rolled piece and the K1 guide wheel to be consistent, and when the guide wheel clamps the material model, the material model is completely attached to the guide wheel to enhance the supporting effect; the double rows of guides are used, the rear row of guide wheels are modified, the wheel diameter of the rear row of guide wheels is increased, when the front row of guide wheels are used for tightening materials, the gap of the rear row of guide wheels is consistent with that of the front row, the double rows of guides support K2 rolled pieces, and the technology can control the shaft error to be 0;
the rolling process comprises the following steps:
a finishing and collecting process: after the steel is rolled from the finished product pass, the steel is conveyed to an apron plate of a cooling bed through a roller way, the apron plate is divided into 12 sections, the sections are connected in series through pins, a plurality of proper continuous sections or all the apron plates are selected as movable apron plates according to the finished product speed, the apron plate with disconnected pins is used as a fixed apron plate and is continuously kept at a high position, and only rolled pieces are conveyed as the roller way; the unbroken apron board realizes the conversion of high, medium and low positions by driving a hydraulic cylinder, and throws steel of each multiple length to a cooling bed;
adopt notch cuttype cell type shearing cutting edge, install the last cutting edge of cutting edge broad below to, make into the stairstepping with last cutting edge design, later grind out the cell type again, hot rolling circle pipe trapezoidal shear shearing method: two pieces of steel are respectively placed at the high and low shearing blades during shearing, the high shearing blade end firstly touches the steel for shearing when the upper shearing blade moves downwards, and only two pieces of steel are cut at the moment; the shearing edge continuously descends to the high shearing edge end to shear the steel, the low shearing edge end contacts the steel to continuously shear, and only two pieces of steel are sheared at the moment. The design directly doubles the shearing capacity of the fixed shears and greatly improves the shearing efficiency.
By adopting the method of the invention, (1) the 45# steel is heated by adopting a gradient heating and rapid heating combined application mode to form a uniform temperature field, and the gradient heating reduces thermal deformation cracks; (2) The residual oxygen content of the flue gas is used as feedback control, and the air-fuel ratio is corrected in real time to achieve the optimal air-gas ratio. High temperature is avoided, the interior of the furnace is in weak oxidation atmosphere, and a decarburized layer is reduced. Actual decarburized layer depth of not more than 0.5% by weight D, satisfies the product requirements; (3) The out-of-roundness of the hot-rolled round tube blank is controlled to be less than or equal to 0.3mm by the true round pass rolling technology and is far higher than the standard requirement of YB/T5222-2014. (4) The trapezoidal shearing not only solves the problem of trimming and burr of saw cutting, but also improves the production efficiency of 45# steel by one time.
Drawings
FIG. 1 is a diagram of a new hole type of phi 60 hot-rolled round pipe blank of the invention;
FIG. 2 is a diagram of a new hole type of phi 55 hot-rolled round pipe blank of the invention;
FIG. 3 is a diagram of a new hole type of the phi 50 hot-rolled round pipe blank of the invention;
FIG. 4 is a new invention hole pattern diagram of phi 45 hot-rolled round tube blank of the invention;
FIG. 5 is a view of the cutting edge of the stepped slot-type shears of the present invention;
FIG. 6 is a cut view of a slot shear of the present invention.
Detailed Description
A process for producing a hot-rolled round pipe blank by a short-stress two-roller mill selects No. 45 steel and comprises the following chemical components: 0.17 to 0.37 percent of Si, 0.50 to 0.80 percent of Mn, less than or equal to 0.035 percent of P, 0.42 to 0.50 percent of C, less than or equal to 0.035 percent of S, less than or equal to 0.30 percent of Ni, less than or equal to 0.25 percent of Cr and Cu, and the balance of Fe and impurities; 45# Steel heating System: the air-fuel ratio is 2.0-2.2, the heating section is less than or equal to 1200 ℃, the soaking section is less than or equal to 1150 ℃, the initial rolling temperature is 1000 +/-15 ℃, and the bed temperature is less than or equal to 950 ℃;
heating: the heating furnace presets the ratio of gas and air by taking the heat value of the gas as feedforward, controls the air-fuel ratio, controls the opening of the air and gas valves by utilizing the valve characteristics, controls the air-gas flow along with the change of temperature when the temperature is close to the target temperature, controls the residual oxygen of flue gas as feedback control, corrects the air-fuel ratio in real time, achieves the optimal air-gas ratio, avoids high temperature, is a weak oxidizing atmosphere in the furnace, reduces a decarburizing layer, and ensures that the actual decarburizing layer depth is less than or equal to 0.5 percent;
the hot rolling round pipe blank rounding process is implemented as follows: designing a set of true round hole patterns, as shown in figures 1-4, wherein the size of a K2 material is close to that of a circle, the rolling process is changed into ellipse-circle, and the last three rolling mills simulate the rounding principle of a KOCKS rolling mill to perform online rounding; modifying the K1 guide wheel to ensure that the R arc of the K2 rolled piece is consistent with that of the K1 guide wheel, and when the guide wheel clamps the material model, the material model is completely attached to the guide wheel to enhance the supporting effect; the double rows of guides are used, the rear row of guide wheels are modified, the wheel diameter of the rear row of guide wheels is increased, when the front row of guide wheels are used for tightening materials, the gap of the rear row of guide wheels is consistent with that of the front row, the double rows of guides support K2 rolled pieces, and the technology can control the shaft error to be 0;
the rolling process takes a hot-rolled round pipe blank with the pipe diameter of 60 as an example:
a finishing and collecting process: after the steel is rolled from the finished product pass, the steel is conveyed to an apron plate of a cooling bed through a roller way, the apron plate is divided into 12 sections, the sections are connected in series through pins, a plurality of proper continuous sections or all the apron plates are selected as movable apron plates according to the finished product speed, the apron plate with disconnected pins is used as a fixed apron plate and is continuously kept at a high position, and only rolled pieces are conveyed as the roller way; the unbroken skirt boards realize the conversion of high, medium and low positions by driving a hydraulic cylinder, and each multiple length cast steel is put on a cooling bed;
the ladder-shaped groove-shaped shearing blade is adopted, as shown in figures 5 and 6, an upper shearing blade with a wider shearing blade is arranged below the shearing blade, the upper shearing blade is designed into a ladder shape, then the groove shape is ground, and the ladder-shaped shearing method of the hot-rolled circular tube blank comprises the following steps: two pieces of steel are respectively placed at the high and low shearing blades during shearing, the high shearing blade end firstly touches the steel for shearing when the upper shearing blade moves downwards, and only two pieces of steel are cut at the moment; after the steel is sheared by the shear blade continuously descending high shear blade end, the low shear blade end contacts the steel for continuous shearing, and only two pieces of steel are sheared at the moment.
Claims (1)
1. A process for producing a hot-rolled round pipe blank by a short-stress two-roll mill is characterized by comprising the following steps of: no. 45 steel is selected, and the chemical components are as follows: 0.17 to 0.37 percent of Si, 0.50 to 0.80 percent of Mn, less than or equal to 0.035 percent of P, 0.42 to 0.50 percent of C, less than or equal to 0.035 percent of S, less than or equal to 0.30 percent of Ni, less than or equal to 0.25 percent of Cr and Cu, and the balance of Fe and impurities; 45# Steel heating System: the air-fuel ratio is 2.0-2.2, the heating section is less than or equal to 1200 ℃, the soaking section is less than or equal to 1150 ℃, the initial rolling temperature is 1000 +/-15 ℃, and the bed temperature is less than or equal to 950 ℃;
heating: the heating furnace presets the ratio of gas and air by taking the heat value of the gas as feedforward, controls the air-fuel ratio, controls the opening of the air and gas valves by utilizing the valve characteristics, controls the air-gas flow along with the change of temperature when the temperature is close to the target temperature, controls the residual oxygen of flue gas as feedback control, corrects the air-fuel ratio in real time, achieves the optimal air-gas ratio, avoids high temperature, is a weak oxidizing atmosphere in the furnace, reduces a decarburizing layer, and ensures that the actual decarburizing layer depth is less than or equal to 0.5 percent;
the hot rolling round pipe blank rounding process is implemented as follows: designing a set of true round hole patterns, wherein the size of the K2 material pattern is close to a circle, changing the rolling process into ellipse-circle, and performing online circle gauge by using the last three rolling mills to simulate the rounding principle of a KOCKS rolling mill; modifying the K1 guide wheel to enable the R arcs of the K2 rolled piece and the K1 guide wheel to be consistent, and when the guide wheel clamps the material model, the material model is completely attached to the guide wheel to enhance the supporting effect; the double rows of guides and guards are used, the rear row of guide wheels are modified, the wheel diameter of the rear row of guide wheels is increased, when the front row of guide rollers are used for tightening materials, the gap of the rear row of guide wheels is consistent with that of the front row, the double rows of guides and guards support K2 rolled pieces, and the technology can control the shaft error to be 0;
the rolling process comprises the following steps:
a finishing and collecting process: after the steel is rolled from the finished product pass, the steel is conveyed to an apron plate of a cooling bed through a roller way, the apron plate is divided into 12 sections, the sections are connected in series through pins, a plurality of proper continuous sections or all the apron plates are selected as movable apron plates according to the finished product speed, the apron plate with disconnected pins is used as a fixed apron plate and is continuously kept at a high position, and only rolled pieces are conveyed as the roller way; the unbroken skirt boards realize the conversion of high, medium and low positions by driving a hydraulic cylinder, and each multiple length cast steel is put on a cooling bed;
adopt notch cuttype cell type shearing cutting edge, install the last cutting edge of cutting edge broad below to, make into the stairstepping with last cutting edge design, later grind out the cell type again, hot rolling circle pipe trapezoidal shear shearing method: two pieces of steel are respectively placed at the high and low shearing blades during shearing, the high shearing blade end firstly touches the steel for shearing when the upper shearing blade moves downwards, and only two pieces of steel are cut at the moment; the shearing edge continuously descends to the high shearing edge end to shear the steel, the low shearing edge end contacts the steel to continuously shear, and only two pieces of steel are sheared at the moment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210939671.9A CN115351088A (en) | 2022-08-05 | 2022-08-05 | Process for producing hot-rolled round pipe blank by using short-stress two-roll mill |
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| CN202210939671.9A CN115351088A (en) | 2022-08-05 | 2022-08-05 | Process for producing hot-rolled round pipe blank by using short-stress two-roll mill |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101020190A (en) * | 2007-03-21 | 2007-08-22 | 中冶东方工程技术有限公司 | Hot rolling process of seamless steel pipe |
| CN103331308A (en) * | 2013-05-22 | 2013-10-02 | 武汉钢铁(集团)公司 | Energy-saving carbon manganese steel rolling method based on critical temperature |
| RU2635122C1 (en) * | 2017-01-25 | 2017-11-09 | Акционерное общество "Выксунский металлургический завод" (АО "ВМЗ") | Method of production of rolled plates with strength class k80, x100, l690 to manufacture arc welded pipes of main pipelines |
| CN109108094A (en) * | 2018-08-27 | 2019-01-01 | 合肥东方节能科技股份有限公司 | A kind of screw-thread steel fine grain rolling intelligent control technology |
| CN111069281A (en) * | 2019-12-31 | 2020-04-28 | 新疆八一钢铁股份有限公司 | Method for controlling out-of-roundness dimension precision of short stress path rolling mill |
| CN112708829A (en) * | 2020-12-21 | 2021-04-27 | 中天钢铁集团有限公司 | Preparation method of high-performance steel for transmission shaft of coal mining machine |
| CN113528970A (en) * | 2021-07-20 | 2021-10-22 | 马鞍山钢铁股份有限公司 | Low-compression-ratio yield strength 355 MPa-grade heavy hot-rolled H-shaped steel and production method and application thereof |
| CN113862446A (en) * | 2021-09-16 | 2021-12-31 | 湖南华菱湘潭钢铁有限公司 | Production method of X70 pipeline steel with high heating temperature |
| CN114405991A (en) * | 2022-03-01 | 2022-04-29 | 张家港荣盛特钢有限公司 | Cogging method for reducing surface decarburization depth of medium-high carbon steel blank |
-
2022
- 2022-08-05 CN CN202210939671.9A patent/CN115351088A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101020190A (en) * | 2007-03-21 | 2007-08-22 | 中冶东方工程技术有限公司 | Hot rolling process of seamless steel pipe |
| CN103331308A (en) * | 2013-05-22 | 2013-10-02 | 武汉钢铁(集团)公司 | Energy-saving carbon manganese steel rolling method based on critical temperature |
| RU2635122C1 (en) * | 2017-01-25 | 2017-11-09 | Акционерное общество "Выксунский металлургический завод" (АО "ВМЗ") | Method of production of rolled plates with strength class k80, x100, l690 to manufacture arc welded pipes of main pipelines |
| CN109108094A (en) * | 2018-08-27 | 2019-01-01 | 合肥东方节能科技股份有限公司 | A kind of screw-thread steel fine grain rolling intelligent control technology |
| CN111069281A (en) * | 2019-12-31 | 2020-04-28 | 新疆八一钢铁股份有限公司 | Method for controlling out-of-roundness dimension precision of short stress path rolling mill |
| CN112708829A (en) * | 2020-12-21 | 2021-04-27 | 中天钢铁集团有限公司 | Preparation method of high-performance steel for transmission shaft of coal mining machine |
| CN113528970A (en) * | 2021-07-20 | 2021-10-22 | 马鞍山钢铁股份有限公司 | Low-compression-ratio yield strength 355 MPa-grade heavy hot-rolled H-shaped steel and production method and application thereof |
| CN113862446A (en) * | 2021-09-16 | 2021-12-31 | 湖南华菱湘潭钢铁有限公司 | Production method of X70 pipeline steel with high heating temperature |
| CN114405991A (en) * | 2022-03-01 | 2022-04-29 | 张家港荣盛特钢有限公司 | Cogging method for reducing surface decarburization depth of medium-high carbon steel blank |
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Application publication date: 20221118 |