CN114892103A - 20CrMo round steel and production process method - Google Patents
20CrMo round steel and production process method Download PDFInfo
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- CN114892103A CN114892103A CN202210297365.XA CN202210297365A CN114892103A CN 114892103 A CN114892103 A CN 114892103A CN 202210297365 A CN202210297365 A CN 202210297365A CN 114892103 A CN114892103 A CN 114892103A
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- 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
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- 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
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses 20CrMo round steel and a production process method thereof, wherein the round steel comprises the following chemical components in percentage by weight: 0.17 to 0.22 percent of C, 0.18 to 0.34 percent of Si, 0.40 to 0.68 percent of Mn, less than or equal to 0.020 percent of P, S, 0.80 to 1.08 percent of Cr, less than or equal to 0.030 percent of Ni and Cu, Mo: 0.15-0.23, and the balance of iron. According to the specification, under the condition of adding a small amount of microalloy elements, the comprehensive performance of the product is improved by controlling the smelting and rolling process, the use requirement of the sucker rod can be met, the slag discharge amount of the converter smelting process is strictly controlled by a double-slag method, the converter smelting process adopts a high-alkalinity, high-oxidability and low-temperature mode to blow for 7-10 minutes, then slag is poured once, and then slag is formed again, so that molten steel is cast after reaching the design components and the casting temperature, the continuous casting pulling speed fluctuation is less than 0.1m/min, the carbon content, the sulfur content and the phosphorus content can be reduced, and the strength, the toughness and the fatigue strength of steel are ensured to meet the requirements of the sucker rod.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to 20CrMo round steel and a production process method thereof.
Background
The 20CrMo steel is mainly used for manufacturing important parts of various machines, such as gear shafts, shaft sleeves, connecting rods and the like, and the steel is required to have high mechanical property so as to meet various requirements under the manufacturing and using conditions of mechanical parts. Especially when used as a sucker rod, the steel has good forging, stamping and cutting processing performances, and also has comprehensive capacity of bearing various loads such as pulling, pressing, shearing, twisting, bending, forging and the like under the use condition, especially has strong impact resistance, and the common round steel production process is difficult to meet the use requirements in various aspects.
Disclosure of Invention
The invention aims to solve the technical problem of providing 20CrMo round steel with low cost and good comprehensive performance and a production process method thereof.
The invention is realized by the following technical scheme:
the 20CrMo round steel comprises the following chemical components in percentage by weight: 0.17 to 0.22 percent of C, 0.18 to 0.34 percent of Si, 0.40 to 0.68 percent of Mn, less than or equal to 0.020 percent of P, S, 0.80 to 1.08 percent of Cr, less than or equal to 0.030 percent of Ni and Cu, Mo: 0.15-0.23, and the balance of iron and inevitable impurities.
A production process method of 20CrMo round steel comprises the following control processes:
the converter smelting process comprises the following steps: molten iron and scrap steel are loaded into a converter to be blown into molten steel, the condition of the molten iron requires that S is less than or equal to 0.035%, the whole-course slagging is required in the blowing process, the lance position is pulled up in the early stage, the lance position is 60-70mm higher than the normal lance position, the end lance position is 60-70mm lower than the normal lance position, the carbon is ensured to be hit by pulling one time, the post-blowing is avoided, sintered ore, iron scale and fluoride-free slagging agent are added in the early stage of the blowing and when the slag is dried back, Cr, Mo, Ni, Cu and metal elements are added, argon is blown in the whole course, the slag amount is strictly controlled by adopting a double-slag method, the slag is poured after the blowing is carried out for 7-10 minutes by adopting high-alkalinity, high-oxidability and low-temperature modes, then the slag is re-formed, the molten steel is cast after reaching the design component and the casting temperature, and the continuous casting pulling speed fluctuation is less than 0.1m/min, and a square billet is obtained;
a heating process: the square billet is sent to a stepping heating furnace for heating, the temperature of the whole billet is uniform to reach 1000 +/-10 ℃, and then the billet is taken out of the furnace for ultra-high pressure water dephosphorization with the pressure of more than 20 MPa;
the rolling process comprises the following steps: and (3) feeding the blanks subjected to the phosphorus removal by the ultrahigh pressure water into a continuous rolling unit for rolling, wherein the initial rolling temperature is 940-.
Optimally, the water pressure of the forward water cooling tank and the reverse water cooling tank is 1.4-1.6MPa, and the water quantity is 400-600L/min.
The invention has the beneficial technical effects that:
according to the invention, under the condition of adding a small amount of micro-alloy elements according to the specification and size, the comprehensive performance of the product is improved by controlling the smelting and rolling processes, and the use requirement of the sucker rod can be met.
The converter smelting process strictly controls the slag discharge amount by a double-slag method, adopts a high-alkalinity, high-oxidability and low-temperature mode to blow for 7-10 minutes, then pours the slag once, and then re-forms the slag, so that the molten steel is cast after reaching the design components and the casting temperature, the continuous casting pulling speed fluctuation is less than 0.1m/min, the carbon content and the contents of sulfur and phosphorus can be reduced, and the strength, the toughness and the fatigue strength of steel can be ensured to meet the requirements of a sucker rod.
The invention adopts a lower rolling temperature for rolling by controlling the heating process and the hot rolling process, not only reduces the production cost and prevents metal burning loss, but also can reduce the thickness of the iron scale by combining with a high-pressure dephosphorization and cooling control mode, and prevent the iron scale from being pressed into the surface of steel by a roller in the rolling process to influence the surface quality of the steel. And the residual iron oxide scale is prevented from accelerating the abrasion of the roller, and the service life of the roller is reduced. Meanwhile, the matrix structure is pearlite and a small amount of ferrite, no martensite or bainite appears after water cooling, the influence of iron scale of the 20CrMo round steel in the forming process is reduced, the quality of the round steel is ensured, and the use requirement of the sucker rod is met.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The 20CrMo round steel comprises the following chemical components in percentage by weight: 0.17 to 0.22 percent of C, 0.18 to 0.34 percent of Si, 0.40 to 0.68 percent of Mn, less than or equal to 0.020 percent of P, S respectively, 0.80 to 1.08 percent of Cr, less than or equal to 0.030 percent of Ni and Cu respectively, Mo: 0.15-0.23, and the balance of iron and inevitable impurities. The steel is added with trace alloying elements such as Cr, Mo, Ni, Cu and the like, so that the comprehensive performance of the steel can be properly improved, and the strength, the toughness and the impact resistance of the steel are improved.
A production process method of 20CrMo round steel comprises the following control processes:
the converter smelting process comprises the following steps: molten iron and scrap steel are loaded into a converter to be blown into molten steel, the condition of the molten iron requires that S is less than or equal to 0.035%, slag melting is required in the whole blowing process, the gun position is pulled up in the early stage and is 60-70mm higher than the normal gun position, the end gun position is 60-70mm lower than the normal gun position, carbon pulling hit is ensured, post blowing is avoided, sintered ore, iron scale and fluoride-free slag melting agent are added in the early stage of blowing and when slag is dried again, Cr, Mo, Ni, Cu and metal elements are added, and argon is blown in the whole process.
The slag amount is strictly controlled by adopting a double-slag method, the slag is poured once after blowing for 7-10 minutes by adopting a high-alkalinity, high-oxidability and low-temperature mode, then the slag is formed again, and the double-slag method is adopted, so that the total slag forming amount can be reduced, the production cost can be reduced, and the dephosphorization effect can be skipped.
Casting the molten steel after the molten steel reaches the design components and the casting starting temperature, wherein the continuous casting drawing speed fluctuation is less than 0.1m/min, and obtaining a square billet;
a heating process: the square billet is sent to a stepping heating furnace for heating, the temperature of the whole billet reaches 1000 +/-10 ℃, and then the billet is taken out of the furnace for ultra-high pressure water dephosphorization with the pressure of more than 20MPa, so that the thickness of the iron scale can be reduced more quickly and effectively;
the rolling process comprises the following steps: and (3) feeding the blanks subjected to the phosphorus removal by the ultrahigh pressure water into a continuous rolling unit for rolling, wherein the initial rolling temperature is 940-.
Optimally, the water pressure of the forward water cooling tank and the reverse water cooling tank is 1.4-1.6MPa, and the water quantity is 400-600L/min.
The 20CrMo round steel produced by the process method adopts trace or small amount of microalloy Cr, Mo, Ni and Cu, is steel with good impact resistance, has the grain size reaching 10 grade under the control of a converter smelting process, a heating process and a rolling controlled cooling process, solves the problem that a rolled piece is always in a high-temperature state and the thickness of the scale of the finished steel after final rolling is not easy to control, and prevents the product from being blocked by the scale when the product is particularly used for a sucker rod to influence the normal use of the sucker rod.
The production process adopts a high-pressure dephosphorization and low-temperature rolling mode, and after the final rolling is carried out and the cooling is carried out by two groups of forward and backward water cooling boxes and two groups of backward water cooling boxes, the thickness of the iron oxide of the product can be controlled within 20 micrometers, and the hot-rolled metallographic structure is still pearlite plus a small amount of martensite without martensite or bainite, thereby reducing the influence of the iron oxide scale of the product in the using process, ensuring the quality of steel products and being applied to the fields of sucker rods and automobile stabilizer bars with higher requirements on performance.
In conclusion, the 20CrMo round steel and the production process method protected by the invention have low cost and good comprehensive performance, and can be applied to the fields of sucker rods and automobile stabilizer bars with high performance requirements.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A20 CrMo round steel and a production process method are characterized in that: the weight percentage of the chemical components is as follows: 0.17 to 0.22 percent of C, 0.18 to 0.34 percent of Si, 0.40 to 0.68 percent of Mn, less than or equal to 0.020 percent of P, S, 0.80 to 1.08 percent of Cr, less than or equal to 0.030 percent of Ni and Cu, Mo: 0.15-0.23, and the balance of iron;
and comprises the following process flows:
the converter smelting process comprises the following steps: molten iron and scrap steel are loaded into a converter to be blown into molten steel, the condition of the molten iron requires that S is less than or equal to 0.035%, the whole slag melting process is required, the gun position is pulled up in the early stage and is 60-70mm higher than the normal gun position, the end gun position is 60-70mm lower than the normal gun position, sintered ore, iron scale and fluoride-free slag melting agent are added in the early stage of blowing and when the slag is dried again, Cr, Mo, Ni, Cu and metal elements are added, the argon is blown in the whole process, and a double-slag method is adopted for smelting. The double-slag method is characterized in that the slag discharge amount is controlled, the slag is poured once after blowing for 7-10 minutes in a high-alkalinity, high-oxidability and low-temperature mode, then the slag is formed again, and the molten steel is cast after reaching the designed components and the casting temperature. And the continuous casting drawing speed fluctuation is less than 0.1m/min, so as to obtain a square billet, and the square billet is heated;
the rolling process comprises the following steps: and (3) feeding the blank subjected to the phosphorous removal by the ultrahigh pressure water into a continuous rolling unit for rolling, wherein the initial rolling temperature is 940- -.
2. The 20CrMo round steel and the production process method thereof according to claim 1, wherein the production process method comprises the following steps: the water pressure of the forward water cooling tank and the reverse water cooling tank is 1.4-1.6MPa, and the water quantity is 400-600L/min.
The 20CrMo round steel and the production process method thereof according to claim 1, wherein the production process method comprises the following steps: the square billet is conveyed to the stepping heating furnace for heating by heating, and austenite grain size of the billet in the heating process is prevented from being large by uniformly heating the preheating section, the heating section and the soaking section of the heating furnace, so that the aim of refining the grain size and improving the mechanical property is fulfilled. After the temperature of the whole billet reaches 1000 +/-10 ℃, discharging the billet out of the furnace, and carrying out ultra-high pressure water dephosphorization at the pressure of more than 20 MPa. The scale on the surface of the billet is effectively removed by removing phosphorus through high-pressure water, the scale is prevented from being pressed into the surface of the steel by a roller in the rolling process, and the surface quality of the steel is ensured.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210297365.XA CN114892103A (en) | 2022-03-24 | 2022-03-24 | 20CrMo round steel and production process method |
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| CN202210297365.XA CN114892103A (en) | 2022-03-24 | 2022-03-24 | 20CrMo round steel and production process method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101177763A (en) * | 2006-11-21 | 2008-05-14 | 安东石油技术（集团）有限公司 | Super strength pumping rod steel |
| CN102061891A (en) * | 2009-11-18 | 2011-05-18 | 安东石油技术（集团）有限公司 | Oil pumping polish rod |
| CN102758051A (en) * | 2012-04-23 | 2012-10-31 | 西宁特殊钢股份有限公司 | Method for producing special steel through high-cleanness low-oxygen content process of rotating furnace |
| CN112831725A (en) * | 2021-01-04 | 2021-05-25 | 盐城市联鑫钢铁有限公司 | Microcrystallized hot-rolled steel bar and production process method |
| CN113621867A (en) * | 2021-08-06 | 2021-11-09 | 联峰钢铁（张家港）有限公司 | Method for optimizing production of low-cost 20CrMoA round steel by reducing VD (vacuum distillation) process and combining components |
-
2022
- 2022-03-24 CN CN202210297365.XA patent/CN114892103A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101177763A (en) * | 2006-11-21 | 2008-05-14 | 安东石油技术（集团）有限公司 | Super strength pumping rod steel |
| CN102061891A (en) * | 2009-11-18 | 2011-05-18 | 安东石油技术（集团）有限公司 | Oil pumping polish rod |
| CN102758051A (en) * | 2012-04-23 | 2012-10-31 | 西宁特殊钢股份有限公司 | Method for producing special steel through high-cleanness low-oxygen content process of rotating furnace |
| CN112831725A (en) * | 2021-01-04 | 2021-05-25 | 盐城市联鑫钢铁有限公司 | Microcrystallized hot-rolled steel bar and production process method |
| CN113621867A (en) * | 2021-08-06 | 2021-11-09 | 联峰钢铁（张家港）有限公司 | Method for optimizing production of low-cost 20CrMoA round steel by reducing VD (vacuum distillation) process and combining components |
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Application publication date: 20220812 |
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