CN113652603A - Rare earth-containing 750 MPa-grade seamless steel tube for engineering machinery and production method thereof - Google Patents
Rare earth-containing 750 MPa-grade seamless steel tube for engineering machinery and production method thereof Download PDFInfo
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- CN113652603A CN113652603A CN202110767586.4A CN202110767586A CN113652603A CN 113652603 A CN113652603 A CN 113652603A CN 202110767586 A CN202110767586 A CN 202110767586A CN 113652603 A CN113652603 A CN 113652603A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 97
- 239000010959 steel Substances 0.000 title claims abstract description 97
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 28
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 239000000126 substance Substances 0.000 claims abstract description 10
- 239000011573 trace mineral Substances 0.000 claims abstract description 10
- 235000013619 trace mineral Nutrition 0.000 claims abstract description 10
- 230000009467 reduction Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 40
- 230000008569 process Effects 0.000 claims description 35
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 27
- 238000001816 cooling Methods 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 238000005496 tempering Methods 0.000 claims description 8
- 238000009749 continuous casting Methods 0.000 claims description 7
- 238000010791 quenching Methods 0.000 claims description 7
- 230000000171 quenching effect Effects 0.000 claims description 7
- 238000007670 refining Methods 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 claims description 5
- 238000009849 vacuum degassing Methods 0.000 claims description 5
- 238000004513 sizing Methods 0.000 claims description 3
- 238000009785 tube rolling Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims 4
- 239000002893 slag Substances 0.000 description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 238000010079 rubber tapping Methods 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 4
- 238000007664 blowing Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000009489 vacuum treatment Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
-
- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a seamless steel tube containing rare earth for 750 MPa-level engineering machinery and a production method thereof, wherein the seamless steel tube containing rare earth for 750 MPa-level engineering machinery comprises the following chemical components in percentage by mass: c0.25-0.35; 0.20 to 0.40 of Si; 1.40-1.70 parts of Mn; 0.20-0.40% of Cr; RE is more than or equal to 0.001; al is less than or equal to 0.050; p is less than or equal to 0.015; s is less than or equal to 0.005; the balance of Fe and non-removable trace elements; the yield strength of the steel pipe after heat treatment is not less than 783MPa, the tensile strength is not less than 872MPa, the elongation after fracture is not less than 20%, the reduction of area is not less than 60%, and the longitudinal impact energy at minus 20 ℃ is not less than 100J, so that the steel pipe can meet the requirements of high-strength and high-toughness steel for engineering machinery.
Description
Technical Field
The invention belongs to the technical field of seamless steel pipe production, and particularly relates to a rare earth-containing 750 MPa-grade seamless steel pipe for engineering machinery and a production method thereof.
Background
The steel for the engineering machinery is a steel material used as a main component of various large-scale engineering machinery equipment such as an excavator, a rotary drilling rig, a crane and a loader. At present, the steel for engineering machinery in China mainly comprises carbon structural steel and low-alloy structural steel. In recent years, with the rapid development of the engineering machinery industry in China, new varieties of high-strength-grade steel for engineering machinery need to be continuously researched and developed, and various comprehensive properties of the steel for engineering machinery are further improved, so that the steel is mainly reflected in the aspects of high strength, excellent low-temperature impact toughness, good welding performance, capability of bearing complex and variable periodic load action in the service process and the like, and is adapted to the development requirements of engineering machinery equipment in the directions of gradually increasing in size, reducing in weight, improving in reliability, improving in durability, improving in precision, saving in energy, protecting environment and the like.
Disclosure of Invention
In view of one or more of the problems in the prior art, one aspect of the present invention provides a method for producing a seamless steel tube for 750MPa grade rare earth-containing engineering machinery, wherein the seamless steel tube for 750MPa grade rare earth-containing engineering machinery comprises the following chemical components by mass: c0.25-0.35; 0.20 to 0.40 of Si; 1.40-1.70 parts of Mn; 0.20-0.40% of Cr; RE is more than or equal to 0.001; al is less than or equal to 0.050; p is less than or equal to 0.015; s is less than or equal to 0.005; the balance of Fe and non-removable trace elements;
the production method of the seamless steel tube for the 750 MPa-level rare earth-containing engineering machinery comprises the following process steps: molten iron pretreatment → smelting in a top-bottom combined blown converter → refining outside an LF furnace → VD vacuum degassing → round billet continuous casting → heating → perforation → tube rolling → stretch reducing/sizing → cooling bed cooling → sawing → heat treatment; wherein:
the molten iron pretreatment process conditions are as follows: carrying out desulfurization treatment before adding molten iron into a converter to ensure that the S content of the pretreated molten iron is less than or equal to 0.005 percent;
the smelting process conditions of the top-bottom combined blown converter are as follows: the alkalinity of final slag smelted by the converter is more than or equal to 3.0; converter endpoint control objective: c is more than or equal to 0.06%, P is less than or equal to 0.010%, and the tapping temperature is 1610-1630 ℃; the final deoxidation adopts an aluminum deoxidation process; the lower slag amount in the tapping process is strictly controlled, slag is removed when slag-stopping tapping is failed, and the molten steel is prevented from rephosphorizing;
the LF external refining process conditions are as follows: argon is blown in the whole process of LF refining, and the argon blowing strength is preferably to keep molten steel wriggling and not to expose the molten steel; raising the temperature by gradually increasing the temperature raising speed from a low level to a high level; white slag is manufactured, the white slag holding time is more than or equal to 20min, and the slag condition is adjusted according to the condition to ensure the white slag to be tapped;
the VD vacuum degassing process conditions are as follows: the vacuum degree of VD vacuum treatment is less than or equal to 0.10KPa, and the target value is controlled according to less than or equal to 0.06 KPa; ensuring that the deep vacuum time is more than or equal to 13 minutes; the soft blowing time after the vacuum treatment is more than or equal to 15 minutes, and the weak stirring effect is required to be noticed, so that the molten steel cannot be exposed;
the round billet continuous casting process conditions are as follows: in the continuous casting process, the operation processes of whole-process protective casting, electromagnetic stirring, constant-pulling-speed casting and the like are adopted; the superheat degree of the molten steel is controlled to be less than or equal to 30 ℃;
the heating process conditions are as follows: the temperature and time of each section of the heating furnace are monitored in the heating process of the tube blank, the extension of the defects of the thermal stress on the core part or the outer surface of the tube blank is reduced, the tube blank is uniformly heated in the heating furnace, and the phenomena of shade and sun surfaces, heating impermeability, overheating or overburning are avoided;
the cooling process conditions of the cooling bed are as follows: the hot-rolled steel pipe adopts a cooling process of close-packed slow cooling in a cooling bed, the rolling rhythm of the steel pipe is controlled well, and the steel pipe can be continuously stepped and rotated after being loaded on the cooling bed so as to avoid bending caused by waiting;
the heat treatment process conditions are as follows: quenching at 890-930 ℃ and tempering at 560-600 ℃ on the whole length of the steel pipe.
In the production method, the heat treatment process conditions are as follows: quenching at 910-930 deg.c and tempering at 560-580 deg.c.
In the production method, the seamless steel tube for the 750 MPa-level rare earth-containing engineering machinery comprises the following chemical components in percentage by mass: 0.25-0.30% of C; 0.20 to 0.35 of Si; 1.45-1.70 parts of Mn; 0.25-0.35% of Cr; RE 0.001-0.003; al is less than or equal to 0.030; p is less than or equal to 0.015; s is less than or equal to 0.005; the balance being Fe and non-removable trace elements.
In the production method, the seamless steel tube for the 750 MPa-level rare earth-containing engineering machinery comprises the following chemical components in percentage by mass: c0.25-0.28; 0.28-0.35 of Si; 1.60-1.70 parts of Mn; 0.25-0.35% of Cr; RE is 0.001-0.002; al is less than or equal to 0.025; p is less than or equal to 0.015; s is less than or equal to 0.005; the balance being Fe and non-removable trace elements.
The invention also provides a seamless steel tube containing rare earth for 750 MPa-level engineering machinery, which is obtained by the production method, and the mechanical property of the seamless steel tube containing rare earth for 750 MPa-level engineering machinery meets the following requirements: the yield strength is more than or equal to 783MPa, the tensile strength is more than or equal to 872MPa, the elongation after fracture is more than or equal to 20 percent, the reduction of area is more than or equal to 60 percent, and the longitudinal impact energy at minus 20 ℃ is more than or equal to 100J.
The mechanical property of the seamless steel pipe for the 750 MPa-level engineering machinery containing rare earth meets the following requirements: the yield strength is more than or equal to 818MPa, and the tensile strength is more than or equal to 914 MPa.
The production method of the seamless steel tube for the 750 MPa-grade rare earth-containing engineering machinery, which is provided based on the technical scheme, can obtain the 750 MPa-grade rare earth-containing seamless steel tube for the engineering machinery, which is excellent in material quality, excellent in performance and reasonable in production technology and process, through reasonable component design and production process conditions, particularly heat treatment process conditions, the yield strength of the heat-treated seamless steel tube is more than or equal to 783MPa, the tensile strength of the heat-treated seamless steel tube is more than or equal to 872MPa, the elongation after fracture is more than or equal to 20%, the reduction of area is more than or equal to 60%, the longitudinal impact power at minus 20 ℃ is more than or equal to 100J, particularly the yield strength is more than or equal to 818MPa, and the tensile strength is more than or equal to 914MPa, and the requirements of steel for high-strength and high-toughness engineering machinery can be met.
Detailed Description
The invention aims to provide a seamless steel tube containing rare earth for 750 MPa-level engineering machinery and having excellent comprehensive mechanical properties and a production method thereof.
The seamless steel tube for the 750 MPa-level rare earth-containing engineering machinery comprises the following chemical components in percentage by mass: c0.25-0.35; 0.20 to 0.40 of Si; 1.40-1.70 parts of Mn; 0.20-0.40% of Cr; RE is more than or equal to 0.001; al is less than or equal to 0.050; p is less than or equal to 0.015; s is less than or equal to 0.005; the balance of Fe and non-removable trace elements; preferably 0.25 to 0.30 of C; 0.20 to 0.35 of Si; 1.45-1.70 parts of Mn; 0.25-0.35% of Cr; RE 0.001-0.003; al is less than or equal to 0.030; p is less than or equal to 0.015; s is less than or equal to 0.005; the balance of Fe and non-removable trace elements; further preferably C0.25-0.28; 0.28-0.35 of Si; 1.60-1.70 parts of Mn; 0.25-0.35% of Cr; RE is 0.001-0.002; al is less than or equal to 0.025; p is less than or equal to 0.015; s is less than or equal to 0.005; the balance being Fe and non-removable trace elements.
In the above components:
c can play a role in solid solution strengthening and precipitation strengthening in steel, and the yield strength, tensile strength and hardness of the steel are increased along with the increase of the carbon content, but the plasticity and impact toughness of the steel are reduced when the carbon content is too high. In order to ensure that the steel grade has high strength and good impact toughness, the content of C in the invention is 0.25-0.35%.
Si is an element added into steel as a deoxidizer during steel making, and is dissolved in ferrite in the steel to improve the strength and hardness of the steel, thereby being beneficial to improving the tempering stability and the oxidation resistance of the steel, but simultaneously reducing the plasticity and the toughness of the steel to a certain extent. The content of Si in the invention is 0.20-0.40%.
Mn is an element that is easily segregated, and the segregation degree of Mn increases as the content of C in steel increases. The content of Mn in the invention is 1.40-1.70%.
Cr plays a role in improving strength, hardness, wear resistance, oxidation resistance and corrosion resistance in steel, but too high content of Cr promotes temper brittleness of steel, and adversely affects impact toughness of steel. The content of Cr in the invention is 0.20-0.40%.
RE has the functions of purification, modification and alloying in steel. The addition of proper amount of RE element can deoxidize, desulfurize, inhibit the segregation of low-melting point impurity in grain boundary, modify, reduce and refine the inclusion, purify grain boundary, strengthen solid solution, etc. The addition amount of RE in the invention is more than or equal to 0.001 percent.
Al is a common deoxidizer in steel, a small amount of aluminum is added into the steel, crystal grains can be refined, the impact toughness, the oxidation resistance and the corrosion resistance of the steel are improved, but when the content of the Al is higher, the graphitization tendency of the steel is promoted, and the high-temperature strength and the toughness of the steel are reduced. The content of Al in the invention is controlled to be less than or equal to 0.050%.
P, S is a harmful element in steel, and the high P content in the steel can cause the cold brittleness of the steel, reduce the plasticity and impact toughness of the steel and deteriorate the welding performance and cold bending performance of the steel. The high S content in the steel causes the steel to be hot-brittle, reduces the ductility, impact toughness, welding performance and corrosion resistance of the steel, and is easy to crack during forging and rolling of the steel. Therefore, in order to improve the impact toughness and weldability of the steel, the content of P, S in the steel is reduced as much as possible on the premise of considering both the steelmaking process level and the cost, and the P content in the steel is required to be less than or equal to 0.015 percent and the S content in the steel is required to be less than or equal to 0.005 percent.
In a preferred embodiment of the invention, the production method of the seamless steel tube for the 750MPa grade engineering machinery containing rare earth comprises the following process steps: molten iron pretreatment → smelting in a top-bottom combined blown converter → refining outside an LF furnace → VD vacuum degassing → round billet continuous casting → heating → perforation → tube rolling → stretch reducing/sizing → cooling bed cooling → sawing → heat treatment; wherein:
the molten iron pretreatment process conditions are as follows: before the molten iron is added into the converter, desulfurization treatment is carried out, so that the S content of the pretreated molten iron is less than or equal to 0.005 percent;
the smelting process conditions of the top-bottom combined blown converter are as follows: the alkalinity of final slag smelted by the converter is more than or equal to 3.0; converter endpoint control objective: c is more than or equal to 0.06%, P is less than or equal to 0.010%, and the tapping temperature is 1610-1630 ℃; the final deoxidation adopts an aluminum deoxidation process; the lower slag amount in the tapping process is strictly controlled, slag is removed when slag-stopping tapping is failed, and the molten steel is prevented from rephosphorizing;
the LF external refining process conditions are as follows: argon is blown in the whole process of LF refining, and the argon blowing strength is preferably to keep molten steel wriggling and not to expose the molten steel; raising the temperature by gradually increasing the temperature raising speed from a low level to a high level; white slag is manufactured, the white slag holding time is more than or equal to 20min, and the slag condition is adjusted according to the condition to ensure the white slag to be tapped;
the VD vacuum degassing process conditions are as follows: the vacuum degree of VD vacuum treatment is less than or equal to 0.10KPa, and the target value is controlled according to less than or equal to 0.06 KPa; ensuring that the deep vacuum time is more than or equal to 13 minutes; the soft blowing time after the vacuum treatment is more than or equal to 15 minutes, and the weak stirring effect is required to be noticed, so that the molten steel cannot be exposed;
the round billet continuous casting process conditions are as follows: in the continuous casting process, the operation processes of whole-process protective casting, electromagnetic stirring, constant-pulling-speed casting and the like are adopted; the superheat degree of the molten steel is controlled to be less than or equal to 30 ℃;
the heating process conditions are as follows: the temperature and time of each section of the heating furnace are monitored in the heating process of the tube blank, the extension of the defect of the thermal stress on the core part or the outer surface of the tube blank is reduced, the tube blank is uniformly heated in the heating furnace, and the phenomena of shade and sun surfaces, heating impermeability, overheating or overburning are avoided;
the cooling process conditions of the cooling bed are as follows: the hot-rolled steel pipe adopts a cooling process of close-packed slow cooling in a cooling bed, the rolling rhythm of the steel pipe is controlled well, and the steel pipe can be continuously stepped and rotated after being loaded on the cooling bed so as to avoid bending caused by waiting;
the heat treatment process conditions are as follows: carrying out 890-930 ℃ quenching and 560-600 ℃ tempering treatment on the whole length of the steel pipe; preferably, the heat treatment process conditions are as follows: quenching at 910-930 deg.c and tempering at 560-580 deg.c.
The present invention is described in more detail below with reference to examples. These examples are merely illustrative of the best mode of carrying out the invention and do not limit the scope of the invention in any way.
Examples
The chemical composition of the steel pipes of the examples is shown in table 1. The heat treatment process conditions of the examples are shown in table 2. The mechanical properties of the steel pipes of the examples are shown in Table 3.
Table 1: chemical composition of Steel pipe in each example (mass%/%)
| Examples | C | Si | Mn | Cr | P | S | Al | RE (addition amount) |
| Example 1 | 0.25 | 0.35 | 1.70 | 0.35 | 0.010 | 0.003 | 0.020 | 0.001 |
| Example 2 | 0.28 | 0.28 | 1.60 | 0.25 | 0.011 | 0.004 | 0.025 | 0.002 |
| Example 3 | 0.30 | 0.20 | 1.45 | 0.30 | 0.009 | 0.005 | 0.030 | 0.003 |
Table 2: conditions of Heat treatment Process in examples
| Examples | Quenching (. degree.C.) | Tempering (. degree.C.) |
| Examples 1 to 1 | 930 | 560 |
| Examples 1 to 2 | 930 | 580 |
| Examples 1 to 3 | 930 | 600 |
| Example 2-1 | 910 | 560 |
| Examples 2 to 2 | 910 | 580 |
| Examples 2 to 3 | 910 | 600 |
| Example 3-1 | 890 | 560 |
| Examples 3 to 2 | 890 | 580 |
| Examples 3 to 3 | 890 | 600 |
TABLE 3 mechanical Properties of the steel pipes of the examples
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. 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 (6)
1. The production method of the seamless steel tube for the 750 MPa-level rare earth-containing engineering machinery is characterized in that the seamless steel tube for the 750 MPa-level rare earth-containing engineering machinery comprises the following chemical components in percentage by mass: c0.25-0.35; 0.20 to 0.40 of Si; 1.40-1.70 parts of Mn; 0.20-0.40% of Cr; RE is more than or equal to 0.001; al is less than or equal to 0.050; p is less than or equal to 0.015; s is less than or equal to 0.005; the balance of Fe and non-removable trace elements;
the production method of the seamless steel tube for the 750 MPa-level rare earth-containing engineering machinery comprises the following process steps: molten iron pretreatment → smelting in a top-bottom combined blown converter → refining outside an LF furnace → VD vacuum degassing → round billet continuous casting → heating → perforation → tube rolling → stretch reducing/sizing → cooling bed cooling → sawing → heat treatment; wherein the heat treatment process conditions are as follows: quenching at 890-930 ℃ and tempering at 560-600 ℃ on the whole length of the steel pipe.
2. The method for producing the seamless steel tube containing rare earth for 750 MPa-level engineering machinery according to claim 1, wherein the heat treatment process conditions are as follows: quenching at 910-930 deg.c and tempering at 560-580 deg.c.
3. The method for producing the seamless steel tube for the 750 MPa-level rare earth-containing construction machinery according to claim 1 or 2, wherein the seamless steel tube for the 750 MPa-level rare earth-containing construction machinery comprises the following chemical components in percentage by mass: 0.25-0.30% of C; 0.20 to 0.35 of Si; 1.45-1.70 parts of Mn; 0.25-0.35% of Cr; RE 0.001-0.003; al is less than or equal to 0.030; p is less than or equal to 0.015; s is less than or equal to 0.005; the balance being Fe and non-removable trace elements.
4. The method for producing the seamless steel tube for the 750 MPa-level rare earth-containing construction machinery according to claim 1 or 2, wherein the seamless steel tube for the 750 MPa-level rare earth-containing construction machinery comprises the following chemical components in percentage by mass: c0.25-0.28; 0.28-0.35 of Si; 1.60-1.70 parts of Mn; 0.25-0.35% of Cr; RE is 0.001-0.002; al is less than or equal to 0.025; p is less than or equal to 0.015; s is less than or equal to 0.005; the balance being Fe and non-removable trace elements.
5. A seamless steel tube for 750MPa grade rare earth-containing engineering machinery, which is obtained by the production method according to any one of claims 1 to 4, and has mechanical properties satisfying the following requirements: the yield strength is more than or equal to 783MPa, the tensile strength is more than or equal to 872MPa, the elongation after fracture is more than or equal to 20 percent, the reduction of area is more than or equal to 60 percent, and the longitudinal impact energy at minus 20 ℃ is more than or equal to 100J.
6. The seamless steel tube containing rare earth for 750 MPa-level engineering machinery according to claim 5, wherein the mechanical properties of the seamless steel tube meet the following requirements: the yield strength is more than or equal to 818MPa, and the tensile strength is more than or equal to 914 MPa.
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