CN114130814B - Method for controlling flatness of grinding ball steel with high precision - Google Patents
Method for controlling flatness of grinding ball steel with high precision Download PDFInfo
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- CN114130814B CN114130814B CN202111248796.9A CN202111248796A CN114130814B CN 114130814 B CN114130814 B CN 114130814B CN 202111248796 A CN202111248796 A CN 202111248796A CN 114130814 B CN114130814 B CN 114130814B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 78
- 239000010959 steel Substances 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 72
- 238000005096 rolling process Methods 0.000 claims abstract description 126
- 238000010438 heat treatment Methods 0.000 claims abstract description 65
- 238000001816 cooling Methods 0.000 claims abstract description 41
- 239000000498 cooling water Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000005452 bending Methods 0.000 claims abstract description 22
- 238000009749 continuous casting Methods 0.000 claims description 21
- 239000000126 substance Substances 0.000 claims description 11
- 241000951498 Brachypteraciidae Species 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 238000010583 slow cooling Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 8
- 239000000203 mixture Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000002791 soaking Methods 0.000 description 8
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/20—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a non-continuous process,(e.g. skew rolling, i.e. planetary cross rolling)
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- 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
- B21B2015/0071—Levelling the rolled product
Abstract
The invention provides a method for controlling the flatness of grinding ball steel with high precision, which comprises the working procedures of heating, high-pressure water descaling, cogging rolling, continuous rolling, cooling and seven-roller straightening; wherein the heating temperature in the heating step is 1170-1270 ℃ and the heating time is 175-442 min; and a continuous rolling process, wherein the speed of a roller way behind a cogging mill is 1.5-2.0 m/s, 6-8 passes of continuous rolling are performed, the cooling water of a roller is started, and the initial rolling temperature of the continuous rolling is controlled to be 950-980 ℃. The bending degree of the original rolled material is reduced by reasonably designing heating and rolling process parameters, and then parameters such as the angle, the rolling reduction, the reverse bending amount and the like of the straightener are reasonably designed according to different specifications, so that the straightening process of the grinding ball steel is not slipped, straightening stress cracks are not generated, and the flatness within 2mm per meter is achieved; not only has high precision and high operation rate, but also can ensure that the quality of the inner core part of the rolled material is not affected and shorten the delivery period.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for controlling the flatness of grinding ball steel with high precision.
Background
The ball grinding steel belongs to high-carbon steel, is used for crushing materials in a mill, and needs to bear multiple collisions and rotations in the use process, so that the ball grinding steel is required to have high hardness, good wear resistance and strong impact resistance; however, in the process of producing the steel grade in the prior art, the steel is easy to bend, the bending reaches more than 10mm per meter, the hardness is high, and the steel is not easy to straighten. In the past, a pressure straightener is adopted, the principle is that two supporting points drag steel materials, and a pressure head applies opposite force to a bending part to meet the flatness requirement of a user; but the flatness accuracy can only reach within 3mm per meter through the pressure straightener, the straightening accuracy is poor, the straightening amount is about 100 counts per day, the operation rate is low, and due to the large yield and the tension of delivery period, the contract delivery on schedule is seriously influenced according to the original process; the general seven-roller straightening process is adopted, the straightening difficulty is great, the bending is more than 10mm per meter, the steel cannot directly enter a seven-roller straightener, the steel needs to be straightened in advance by pressure straightening, and after entering the seven-roller straightening, the steel slides in the straightening rollers, and stress cracks appear in the straightened steel.
Disclosure of Invention
The invention aims to provide a method for controlling the flatness of grinding ball steel with high precision, which reduces the bending degree of the original rolled material by reasonably designing heating and rolling process parameters, reasonably designs parameters such as the angle, the rolling reduction, the reverse bending amount and the like of a straightener aiming at different specifications (specification range: phi 80-phi 110 mm), meets the requirements that the grinding ball steel does not slip and does not generate straightening stress cracks in the straightening process, and simultaneously achieves the flatness within 2mm per meter; not only has high precision and high operation rate, but also can ensure that the quality of the inner core part of the rolled material is not affected and shorten the delivery period.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
a method for controlling the flatness of grinding ball steel with high precision comprises the working procedures of heating, descaling with high-pressure water, cogging and rolling, continuous rolling, cooling and seven-roller straightening; wherein the heating temperature of the heating procedure is 1170-1270 ℃ and the heating time is 175-442 min. The heating temperature is increased, the heating time is prolonged, the heating stress in the heating process can be prevented, and meanwhile, the internal tissue and the component segregation are uniform.
In the heating process, cold blanks are fed into a heating furnace, and the temperature of a preheating zone is 600-790 ℃.
The high-pressure water descaling process has water pressure of 19-27 MPa and performs descaling for 3-5 s in the circumferential direction of the round continuous casting blank.
In the cogging rolling process, the initial rolling temperature of rough rolling is 1100-1170 ℃, 7-11 times of reciprocating rolling are carried out, and meanwhile, roller cooling water and ground roller cooling water are started to obtain an intermediate blank. The initial rolling temperature of rough rolling is controlled to be 1100-1170 ℃, because high-carbon high-silicon steel has poor plasticity and ductility, uneven internal tissues and easily formed crack sources at the component segregation part, and the crack sources are elongated and enlarged in the subsequent continuous rolling process, so that ultrasonic flaw detection is performed after pit discharge; the design of the parameter is prepared for the high-temperature rolling of the subsequent continuous rolling material.
In the continuous rolling process, the speed of a roller way behind a cogging mill is 1.5-2.0 m/s, 6-8 passes of continuous rolling are carried out, cooling water of a roller is started, and the initial rolling temperature of the continuous rolling is controlled to be 950-980 ℃. The control temperature is 950-980 ℃ to prepare for continuous rolling temperature, the steel grade is hypoeutectoid steel, the steel grade is close to eutectoid steel, rolling in the range of 950-980 ℃ is to perform hot working in the austenitic temperature range all the time, and the structure is prevented from being transformed into structural stress when proeutectoid ferrite is precipitated; meanwhile, ferrite and austenite shrink unevenly in volume, so that deformation is uneven, a micro crack source and phase change stress appear, and hairlines appear on the surface and cracks appear in the interior.
The cooling procedure of the invention is to saw cut round steel after continuous rolling, enter a cooling bed for air cooling to 300-450 ℃ after saw cutting, enter a slow cooling pit, and the pit outlet temperature is less than or equal to 200 ℃.
In the seven-roller straightening process, round steel after pit discharge is straightened, and the rotating speed of a main machine is: 400-500 r/min, the rolling reduction of the 1# roller and the 3# roller is 2-3 mm, and the rolling reduction of the 2# roller is 1-2 mm; the angle of the straightening roller and the reverse bending amount are set with different parameters according to the diameter of round steel, and the method is as follows:
when the diameter of the round steel is smaller than or equal to 80mm and smaller than or equal to 85mm, the angles of the No. 1 roller and the No. 3 roller are 30.5-31 degrees, the angle of the No. 2 roller is 31-31.5 degrees, and the reverse bending amount is 13-15 mm;
when the diameter of the round steel is more than 85mm and less than or equal to 110mm, the angles of the No. 1 roller and the No. 3 roller are 31-31.5 degrees, the angle of the No. 2 roller is 31.5-32 degrees, and the reverse bending amount is 12-14 mm.
The grinding ball steel comprises the following chemical components in percentage by weight: c:0.55 to 0.70 percent of Si: 0.70-1.90%, mn:0.65 to 1.05 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.003 percent, als: 0.020-0.040%, cr:0.6 to 0.95 percent, and the balance of Fe and unavoidable residual elements.
The diameter of the grinding ball steel is 80-110 mm.
The flatness of the grinding ball steel is less than or equal to 2mm/m, and the AA level standard is met by ultrasonic flaw detection according to GB/T4162-2008.
The invention improves the heating temperature and prolongs the heating time to uniformly segregation of internal tissues and components of the continuous casting blank; controlling the rolling temperature to enable the steel grade to be subjected to hot working within an austenite temperature range all the time, and preventing the transformation of a structure into a structural stress when proeutectoid ferrite is separated out; meanwhile, ferrite and austenite shrink unevenly in volume, so that deformation is uneven, a micro crack source and phase change stress appear, and hairlines appear on the surface and cracks appear in the interior. The heating process and the rolling process can reduce the original bending degree of the grinding ball steel, and prepare for entering a seven-roller straightener; by controlling parameters such as straightening roller angle, rolling reduction, reverse bending and the like of the seven-roller straightener, the grinding ball steel for the GB/T4162-2008AA grade standard grinding balls can be obtained, wherein the flatness is less than or equal to 2 mm/m.
The invention does not need to carry out pressure straightening pre-straightening, has high flatness and high operation rate, can ensure that the quality of the inner core part of the rolled material is not affected, and shortens the delivery period.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
The specification of the grinding ball steel of the embodiment is phi 80mm, and the chemical composition and the mass percentage content are shown in table 1.
The production method of the grinding ball steel comprises the steps of heating, descaling with high-pressure water, cogging and rolling, continuous rolling, cooling and seven-roller straightening, and the specific process steps are as follows:
(1) Heating procedure: feeding the cold billets into a heating furnace, preheating the cold billets at 790 ℃ in a preheating zone, preheating the round continuous casting billets with phi 300mm in the heating furnace, heating to 1250 ℃, and soaking for 175min;
(2) High-pressure water descaling process: the water pressure is 19Mpa, and the descaling is carried out for 3s in the circumferential direction of the round continuous casting blank in an omnibearing manner;
(3) Cogging and rolling steps: the initial rolling temperature of rough rolling is 1100 ℃, 7-pass reciprocating rolling is carried out, and meanwhile, roller cooling water and ground roller cooling water are started to obtain an intermediate blank;
(4) Tandem rolling procedure: the speed of a roller way behind the cogging mill is 2.0m/s, 8-pass continuous rolling is carried out, and the cooling water of the roller is started, and the temperature entering the continuous rolling mill is controlled to be 950 ℃;
(5) And (3) a cooling procedure: sawing the round steel subjected to continuous rolling, and then entering a cooling bed for air cooling to 300 ℃ after sawing, wherein the pit outlet temperature is 193 ℃;
(6) Straightening: host rotational speed: 420r/min, controlling the roller angles of 1# and 3# to be 30.5 degrees, the roller angle of 2# to be 31.5 degrees, the roller reduction of 1# and 3# to be 2mm, the roller reduction of 2# to be 1mm and the reverse bending amount to be 13mm; the flatness is less than or equal to 2mm/m, and meets GB/T4162-2008AA standard grinding ball steel.
Example 2
The specification of the grinding ball steel of the embodiment is phi 110mm, and the chemical composition and the mass percentage content are shown in table 1.
The production method of the grinding ball steel comprises the steps of heating, descaling with high-pressure water, cogging and rolling, continuous rolling, cooling and seven-roller straightening, and the specific process steps are as follows:
(1) Heating procedure: feeding the cold billets into a heating furnace, preheating the cold billets in a preheating zone at 603 ℃, preheating the round continuous casting billets with phi 450mm in the heating furnace, heating the round continuous casting billets to 1268 ℃, and soaking the round continuous casting billets for 442min;
(2) High-pressure water descaling process: the water pressure is 27Mpa, and the descaling is carried out for 5s in the circumferential direction of the round continuous casting blank in an omnibearing manner;
(3) Cogging and rolling steps: the initial rolling temperature of rough rolling is 1170 ℃, 11-pass reciprocating rolling is carried out, and meanwhile, roller cooling water and ground roller cooling water are started to obtain an intermediate blank;
(4) Tandem rolling procedure: the speed of a roller way behind the cogging mill is 1.5m/s, 6-pass continuous rolling is carried out, and the cooling water of the roller is started, and the temperature entering the continuous rolling mill is controlled to be 980 ℃;
(5) And (3) a cooling procedure: sawing the round steel subjected to continuous rolling, and then entering a cooling bed for air cooling to 360 ℃ after sawing, wherein the pit outlet temperature is 184 ℃;
(6) Straightening: host rotational speed: 500r/min, controlling the 1# roller angle and the 3# roller angle to be 31.5 degrees, the 2# roller angle to be 32 degrees, the 1# roller reduction to be 3mm, the 2# roller reduction to be 1mm and the reverse bending to be 12mm; the flatness is less than or equal to 2mm/m, and meets GB/T4162-2008AA standard grinding ball steel.
Example 3
The specification of the grinding ball steel of the embodiment is phi 85mm, and the chemical composition and the mass percentage content are shown in table 1.
The production method of the grinding ball steel comprises the steps of heating, descaling with high-pressure water, cogging and rolling, continuous rolling, cooling and seven-roller straightening, and the specific process steps are as follows:
(1) Heating procedure: putting the cold blank into a heating furnace, preheating the blank at 780 ℃, preheating the blank with phi 300mm round continuous casting in the heating furnace, heating to 1190 ℃, and soaking for 220min;
(2) High-pressure water descaling process: the water pressure is 25Mpa, and the descaling is carried out for 5s in the circumferential direction of the round continuous casting blank in an omnibearing manner;
(3) Cogging and rolling steps: the initial rolling temperature of rough rolling is 1120 ℃, 7-pass reciprocating rolling is carried out, and meanwhile, roller cooling water and ground roller cooling water are started to obtain an intermediate blank;
(4) Tandem rolling procedure: the speed of a roller way behind the cogging mill is 2.0m/s, 8-pass continuous rolling is carried out, and the cooling water of the roller is started, and the temperature entering the continuous rolling mill is controlled to be 962 ℃;
(5) And (3) a cooling procedure: sawing the round steel subjected to continuous rolling, and then entering a cooling bed for air cooling to 354 ℃ after sawing, wherein the pit outlet temperature is 152 ℃;
(6) Straightening: host rotational speed: 415r/min, controlling the 1# and 3# roller angles to be 31 degrees, the 2# roller angles to be 31.5 degrees, the 1# and 3# roller reduction to be 3mm, the 2# roller reduction to be 2mm and the reverse bending to be 15mm; the flatness is less than or equal to 2mm/m, and meets GB/T4162-2008AA standard grinding ball steel.
Example 4
The specification of the grinding ball steel of the embodiment is phi 88mm, and the chemical composition and the mass percentage are shown in table 1.
The production method of the grinding ball steel comprises the steps of heating, descaling with high-pressure water, cogging and rolling, continuous rolling, cooling and seven-roller straightening, and the specific process steps are as follows:
(1) Heating procedure: putting the cold blank into a heating furnace, preheating the blank at 768 ℃ in a preheating zone, preheating the blank with phi 300mm round continuous casting in the heating furnace, heating to 1248 ℃, and soaking for 421min;
(2) High-pressure water descaling process: the water pressure is 23Mpa, and the descaling is carried out for 5s in the circumferential direction of the round continuous casting blank in an omnibearing manner;
(3) Cogging and rolling steps: the initial rolling temperature of rough rolling is 1123 ℃, 7-pass reciprocating rolling is carried out, and meanwhile, roller cooling water and ground roller cooling water are started to obtain an intermediate blank;
(4) Tandem rolling procedure: the speed of a roller way behind the cogging mill is 1.8m/s, 8-pass continuous rolling is carried out, and the cooling water of the roller is started, and the temperature entering the continuous rolling mill is controlled to be 966 ℃;
(5) And (3) a cooling procedure: sawing the round steel subjected to continuous rolling, and then entering a cooling bed for air cooling to 447 ℃ after sawing, wherein the pit outlet temperature is 142 ℃;
(6) Straightening: host rotational speed: 413r/min, controlling the 1# and 3# roller angles to be 31.2 degrees, the 2# roller angles to be 31.9 degrees, the 1# and 3# roller reduction to be 2.5mm, the 2# roller reduction to be 1.5mm and the reverse bending to be 13.5mm; the flatness is less than or equal to 2mm/m, and the standard grinding ball steel of GB/T4162-2008AA grade is satisfied.
Example 5
The specification of the grinding ball steel of the embodiment is phi 90mm, and the chemical composition and the mass percentage content are shown in table 1.
The production method of the grinding ball steel comprises the steps of heating, descaling with high-pressure water, cogging and rolling, continuous rolling, cooling and seven-roller straightening, and the specific process steps are as follows:
(1) Heating procedure: feeding the cold blank into a heating furnace, preheating the blank at 761 ℃ in a preheating zone, preheating the blank with phi 300mm round continuous casting in the heating furnace, heating to 1234 ℃, and soaking for 416min;
(2) High-pressure water descaling process: the water pressure is 20Mpa, and the descaling is carried out for 5s in the circumferential direction of the round continuous casting blank in an omnibearing manner;
(3) Cogging and rolling steps: the initial rolling temperature of rough rolling is 1118 ℃, 7-pass reciprocating rolling is carried out, and meanwhile, roller cooling water and ground roller cooling water are started to obtain an intermediate blank;
(4) Tandem rolling procedure: the speed of a roller way behind the cogging mill is 1.7m/s, 8-pass continuous rolling is carried out, and the cooling water of the roller is started, and the temperature entering the continuous rolling mill is controlled to be 958 ℃;
(5) And (3) a cooling procedure: sawing the round steel subjected to continuous rolling, and then entering a cooling bed for air cooling to 327 ℃ after sawing, wherein the pit outlet temperature is 137 ℃;
(6) Straightening: host rotational speed: 430r/min, controlling the roller angles of 1# and 3# to be 31.2 degrees, the roller angles of 2# to be 31.7 degrees, the roller reduction of 1# and 3# to be 2.2mm, the roller reduction of 2# to be 1.7mm and the reverse bending amount to be 13.0mm; the flatness is less than or equal to 2mm/m, and the standard grinding ball steel of GB/T4162-2008AA grade is satisfied.
Example 6
The specification of the grinding ball steel of the embodiment is phi 83mm, and the chemical composition and the mass percentage are shown in table 1.
The production method of the grinding ball steel comprises the steps of heating, descaling with high-pressure water, cogging and rolling, continuous rolling, cooling and seven-roller straightening, and the specific process steps are as follows:
(1) Heating procedure: feeding the cold blank into a heating furnace, preheating the blank at 754 ℃ in a preheating zone, preheating the blank with phi 380mm round continuous casting in the heating furnace, heating to 1170 ℃, and soaking for 314min;
(2) High-pressure water descaling process: the water pressure is 21Mpa, and the descaling is carried out for 5s in the circumferential direction of the round continuous casting blank in an omnibearing manner;
(3) Cogging and rolling steps: the initial rolling temperature of rough rolling is 1186 ℃, 11-pass reciprocating rolling is carried out, and meanwhile, roller cooling water and ground roller cooling water are started to obtain an intermediate blank;
(4) Tandem rolling procedure: the speed of a roller way behind the cogging mill is 1.7m/s, 8-pass continuous rolling is carried out, and the cooling water of the roller is started, and the temperature entering the continuous rolling mill is controlled to be 957 ℃;
(5) And (3) a cooling procedure: sawing the round steel subjected to continuous rolling, and then entering a cooling bed for air cooling to 382 ℃ after sawing, wherein the pit outlet temperature is 175 ℃;
(6) Straightening: host rotational speed: 481r/min, control the 1# and 3# roller angles 30.8 °, the 2# roller angles 31 °, the 1# and 3# roller reduction 2.7mm, the 2# roller reduction 1.7mm, the recurve 14mm; the flatness is less than or equal to 2mm/m, and the standard grinding ball steel of GB/T4162-2008AA grade is satisfied.
Example 7
The specification of the grinding ball steel of the embodiment is phi 100mm, and the chemical composition and the mass percentage content are shown in table 1.
The production method of the grinding ball steel comprises the steps of heating, descaling with high-pressure water, cogging and rolling, continuous rolling, cooling and seven-roller straightening, and the specific process steps are as follows:
(1) Heating procedure: putting the cold blank into a heating furnace, preheating the blank at 650 ℃ in a preheating zone, preheating the blank with phi 380mm round continuous casting in the heating furnace, heating to 1221 ℃, and soaking for 354min;
(2) High-pressure water descaling process: the water pressure is 24Mpa, and the descaling is carried out for 5s in the circumferential direction of the round continuous casting blank in an omnibearing manner;
(3) Cogging and rolling steps: the initial rolling temperature of rough rolling is 1194 ℃, 11-pass reciprocating rolling is carried out, and meanwhile, roller cooling water and ground roller cooling water are started to obtain an intermediate blank;
(4) Tandem rolling procedure: the speed of a roller way behind the cogging mill is 1.8m/s, 6-pass continuous rolling is carried out, and the cooling water of the roller is started, and the temperature entering the continuous rolling mill is controlled to be 967 ℃;
(5) And (3) a cooling procedure: sawing the round steel subjected to continuous rolling, and then entering a cooling bed for air cooling to 401 ℃ after sawing, wherein the pit outlet temperature is 176 ℃;
(6) Straightening: host rotational speed: 494r/min, controlling the roller angles of No. 1 and No. 3 to be 31.4 degrees, the roller angles of No. 2 to be 31.9 degrees, the roller reduction of No. 1 and No. 3 to be 2.7mm, the roller reduction of No. 2 to be 1.4mm and the reverse bending to be 12.7mm; the flatness is less than or equal to 2mm/m, and the standard grinding ball steel of GB/T4162-2008AA grade is satisfied.
Example 8
The specification of the grinding ball steel of the embodiment is phi 105mm, and the chemical composition and the mass percentage are shown in table 1.
The production method of the grinding ball steel comprises the steps of heating, descaling with high-pressure water, cogging and rolling, continuous rolling, cooling and seven-roller straightening, and the specific process steps are as follows:
(1) Heating procedure: putting the cold blank into a heating furnace, preheating the blank at 630 ℃ in a preheating zone, preheating the round continuous casting blank with phi 450mm in the heating furnace, heating to 1206 ℃, and soaking for 412min;
(2) High-pressure water descaling process: the water pressure is 22Mpa, and the descaling is carried out for 5s in the circumferential direction of the round continuous casting blank in an omnibearing manner;
(3) Cogging and rolling steps: the initial rolling temperature of rough rolling is 1253 ℃, 11-pass reciprocating rolling is carried out, and meanwhile, roller cooling water and ground roller cooling water are started to obtain an intermediate blank;
(4) Tandem rolling procedure: the speed of a roller way behind the cogging mill is 1.8m/s, 6-pass continuous rolling is carried out, and the cooling water of the roller is started, and the temperature entering the continuous rolling mill is controlled to be 975 ℃;
(5) And (3) a cooling procedure: sawing the round steel subjected to continuous rolling, and then entering a cooling bed for air cooling to 426 ℃ after sawing, wherein the pit outlet temperature is 136 ℃;
(6) Straightening: host rotational speed: 475r/min, controlling the roller angles of No. 1 and No. 3 to be 31.5 degrees, the roller angles of No. 2 to be 31.9 degrees, the roller reduction of No. 1 and No. 3 to be 2.7mm, the roller reduction of No. 2 to be 1.8mm and the reverse bending amount to be 13.8mm; the flatness is less than or equal to 2mm/m, and the standard grinding ball steel of GB/T4162-2008AA grade is satisfied.
TABLE 1 chemical compositions and mass percent (%)
In table 1, the balance is Fe and unavoidable impurities.
Claims (5)
1. A method for controlling the flatness of grinding ball steel with high precision is characterized by comprising the working procedures of heating, descaling with high-pressure water, cogging and rolling, continuous rolling, cooling and seven-roller straightening; wherein the heating temperature of the heating procedure is 1170-1270 ℃ and the heating time is 175-442 min;
the cogging rolling procedure, the initial rolling temperature of rough rolling is 1100-1170 ℃, 7-11 times of reciprocating rolling are carried out, and meanwhile, roller cooling water and ground roller cooling water are started to obtain an intermediate billet;
the continuous rolling procedure is that the speed of a roller way behind a cogging mill is 1.5-2.0 m/s, 6-8 passes of continuous rolling is carried out, the cooling water of a roller is started, and the initial rolling temperature of the continuous rolling is controlled to be 950-980 ℃;
the cooling procedure is to saw cut round steel after continuous rolling, enter a cooling bed for air cooling to 300-450 ℃ after saw cutting, enter a slow cooling pit, and the pit outlet temperature is less than or equal to 200 ℃;
and in the seven-roller straightening process, straightening the round steel after pit discharge, wherein the rotating speed of a main machine is: 400-500 r/min, the rolling reduction of the 1# roller and the 3# roller is 2-3 mm, and the rolling reduction of the 2# roller is 1-2 mm; the angle of the straightening roller and the reverse bending amount are set with different parameters according to the diameter of round steel, and the method is as follows:
when the diameter of the round steel is smaller than or equal to 80mm and smaller than or equal to 85mm, the angles of the No. 1 roller and the No. 3 roller are 30.5-31 degrees, the angle of the No. 2 roller is 31-31.5 degrees, and the reverse bending amount is 13-15 mm;
when the diameter of the round steel is more than 85mm and less than or equal to 110mm, the angles of the No. 1 roller and the No. 3 roller are 31-31.5 degrees, the angle of the No. 2 roller is 31.5-32 degrees, and the reverse bending amount is 12-14 mm;
the flatness of the grinding ball steel is less than or equal to 2mm/m, and the core quality meets GB/T4162-2008AA level standard.
2. The method for controlling the flatness of steel balls with high accuracy according to claim 1, wherein the heating process, cold blank is fed into a heating furnace, and the preheating zone is at 600-790 ℃.
3. The method for controlling the flatness of steel balls with high precision according to claim 1, wherein the high-pressure water descaling process is performed for 3-5 s in all directions in the circumferential direction of the round continuous casting billet under the water pressure of 19-27 Mpa.
4. The method for controlling the flatness of ball steel with high precision according to claim 1, wherein the ball steel comprises the following chemical components in percentage by weight: c:0.55 to 0.70 percent of Si: 0.70-1.90%, mn:0.65 to 1.05 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.003 percent, als: 0.020-0.040%, cr:0.6 to 0.95 percent, and the balance of Fe and unavoidable residual elements.
5. A method of controlling the flatness of ball steel with high accuracy according to claim 1, characterized in that the ball steel has a diameter of 80-110 mm.
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