CN115029621A - 550 MPa-level hot-rolled coil for drill rod of rotary drilling rig and manufacturing method thereof - Google Patents
550 MPa-level hot-rolled coil for drill rod of rotary drilling rig and manufacturing method thereof Download PDFInfo
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
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- 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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B2001/225—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 plates, strips, bands or sheets of indefinite length by hot-rolling
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to a 550 MPa-level hot-rolled coil for a drill rod of a rotary drilling rig, which comprises the following chemical components in percentage by weight: 0.06% -0.08% of C; 0.10 to 0.25 percent of Si; 1.75 to 1.85 percent of Mn; 0.040% -0.055% of Nb; 0.045% -0.060% of Ti; 0.13 to 0.18 percent of Cr; als 0.015% -0.045%; p is less than or equal to 0.015 percent; s is less than or equal to 0.004 percent; n is less than or equal to 0.006 percent; the balance of iron and inevitable impurities, and the cold crack sensitivity coefficient Pcm of the hot-rolled coil is less than or equal to 0.19 percent. The invention adopts the design of low-carbon high-Ti microalloy, adds a small amount of microalloy elements such as Nb, Cr and the like, and controls rolling, ultrafast cooling and laminar cooling processes in two stages to obtain fine acicular ferrite tissues so as to ensure high strength and high toughness and excellent low-temperature fracture toughness.
Description
Technical Field
The invention relates to the technical field of low alloy steel, in particular to a 550 MPa-level hot-rolled coil for a drill rod of a rotary drilling rig and a manufacturing method thereof.
Background
The rotary drilling rig has the characteristics of high efficiency, low noise, environmental protection, high hole forming quality, high mechanization degree and the like, and becomes an ideal construction machine suitable for hole forming operation in building foundation engineering. In the construction of large-diameter concrete cast-in-place piles abroad, the rotary drilling rig generally occupies more than 2/3. The rotary drilling rig has the advantages of high efficiency, environmental protection and high efficiency. Along with the demand of market economy, the construction of railway road water way traffic, water conservancy electric power facilities, ports, wharfs and airports develops comprehensively and rapidly, and the rotary drilling rig is certainly applied more widely.
The drill rod is a tubular structure which is used between a rotary drilling rig and a construction drill bit, transmits loads such as torque, axial pressure and the like, and is telescopic section by section along a common axis, and is formed by sleeving 3-6 steel pipes after machining and welding. The low-steel-grade seamless steel pipe is usually selected originally for manufacturing the steel pipe of the drill rod casing pipe, along with the sharp increase of the application requirements of the rotary drilling rig and the promotion of advanced requirements, the requirements on the drill rod with high strength and toughness, high dimensional precision, high adaptability and good economy are increasingly urgent, and the product upgrading and updating are urgently needed.
In recent years, great progress is made in manufacturing the drill rod of the rotary drilling rig by adopting the seamless pipe. The natural disadvantages of the seamless steel tube in the aspects of size precision, pipe diameter specification, production cost and the like cannot be solved, the existing equipment manufacturing industry tries to replace the seamless steel tube with the straight welded tube to produce the drill rod of the rotary drilling rig, the initial success is achieved, and the good market prospect is shown.
Patent CN202011123402.2, a method for producing hot rolled steel strips for drill rods of rotary drilling rigs. The weight percentage of the chemical components is as follows: c: 0.06% -0.08%, Si: 0.17% -0.27%, Mn: 1.55-1.70%, P is less than or equal to 0.015%, S is less than or equal to 0.008%, Alt: 0.020% -0.050%, Nb: 0.060% -0.070%, Ti: 0.015% -0.025%, Mo: 0.08-0.18%, Cr: 0.20% -0.30%, Ca: 0.0010 to 0.0030 percent, and the balance of iron and inevitable elements. The invention discloses a production method of a hot rolled steel strip for a drill rod of a rotary drilling rig for domestic steel cladding, the product has good fatigue resistance, low-temperature impact toughness, cold bending property and welding property, and the product quality reaches the domestic seamless steel tube product level. However, the noble alloys of the invention have more noble elements such as Nb, Mo, Cr and the like, and the cost is obviously higher.
Patent CN201610639912.2, a seamless steel tube for a drill rod of an ultrahigh-strength rotary drilling rig and a production method thereof. The weight percentage of the chemical components is as follows: c: 0.13% -0.18%, Si: 0.20% -0.50%, Mn: 1.20% -1.70%, Cr: 0.20% -0.60%, Mo: 0.15% -0.40%, Ni: 0.08% -0.25%, V: 0.07% -0.14%, W: 0.10 to 0.70 percent, and the balance of iron and inevitable elements. The invention discloses a seamless steel pipe for a drill rod of a rotary drilling rig, which is produced by adopting a quenching and tempering heat treatment process and is disclosed by domestic steel climbing, and the yield strength value of the product is up to over 800 MPa. The invention contains a large amount of precious alloy elements, is a seamless steel tube adopting a quenching and tempering heat treatment process, and has the production cost far higher than that of a welded tube made of a hot-rolled coiled plate.
Patent CN201510410198.5, a method for producing a large-diameter thin-wall precise seamless steel pipe for a drill rod of a drilling machine. The weight percentage of the chemical components is as follows: c: 0.12% -0.16%, Si: 0.20% -0.40%, Mn: 1.45% -1.60%, V: 0.03% -0.06%, Al: 0.02-0.05%, and the balance of iron and unavoidable elements. The invention discloses a method for producing a large-diameter thin-wall precise seamless steel tube for domestic climbing steel, the product has good strength index, but the toughness is obviously insufficient, and the production cost of the seamless steel tube is far higher than that of a welded tube made of a hot-rolled coiled plate.
Patent CN201610669000.X, seamless steel tube for rotary drilling rig drilling rod and its manufacturing method. The weight percentage of the chemical components is as follows: c: 0.07% -0.10%, Si: 0.15% -0.38%, Mn: 1.20% -1.40%, Cr: 0.10% -0.30%, Mo: 0.15% -0.25%, V: 0.03 to 0.07 percent of the total weight of the alloy, and the balance of iron and inevitable elements. The seamless steel pipe for the drill rod of the rotary drilling rig and the manufacturing method thereof disclosed by the invention are domestic climbing steel, the product has good obdurability indexes, but the alloy cost is obviously higher due to the high content of noble elements, and meanwhile, the production cost of the seamless steel pipe is far higher than that of a welded pipe made of a hot-rolled coiled plate.
The hot-rolled coil is manufactured into a welded pipe through a straight seam welding mode and used for a drill rod of a rotary drilling rig of piling machinery, compared with most seamless welded pipe production processes, the welded pipe has obvious advantages in the aspects of high product size precision, production cost, pipe diameter specification and the like, and the welded pipe has the tendency of gradually replacing seamless steel pipes of the same grade along with the technical development.
Disclosure of Invention
The invention aims to solve the technical problem of providing a 550 MPa-grade hot-rolled coil for a drill rod of a rotary drilling rig and a manufacturing method thereof, wherein the coil is low in cost and has excellent toughness, cold bending performance and welding performance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a550 MPa-level hot-rolled coil for a drill rod of a rotary drilling rig comprises the following chemical components in percentage by weight: 0.06% -0.08% of C; 0.10 to 0.25 percent of Si; 1.75 to 1.85 percent of Mn; 0.040% -0.055% of Nb; 0.045% -0.060% of Ti; 0.13 to 0.18 percent of Cr; als 0.015% -0.045%; p is less than or equal to 0.015 percent; s is less than or equal to 0.004 percent; n is less than or equal to 0.006 percent; the balance of iron and inevitable impurities, and the cold crack sensitivity coefficient Pcm of the hot-rolled coil is less than or equal to 0.19 percent.
The main basic elements and effects are as follows:
c: the steel is the most economic and basic strengthening element in the steel, has obvious effect on improving the strength of the steel through solid solution strengthening and precipitation strengthening, but has negative influence on the toughness and weldability of the steel through improving the content of C, and ensures that the steel has good toughness and good welding performance through low carbon. The C content of the invention is 0.06% -0.08%.
Si: the steel can play a certain role in solid solution strengthening, can obviously improve the elastic limit, the yield strength and the yield ratio of the steel, improve the fatigue strength and the fatigue ratio and improve the wear resistance of the steel, but the plasticity and the toughness of the steel can be obviously reduced when the content is too high. The Si content of the invention is 0.10-0.25%.
Mn: is a good deoxidizer and desulfurizer, improves the strength of steel through solid solution strengthening, and is the most important and economical strengthening element for compensating the strength loss caused by the reduction of the C content. Mn is also an element for expanding a gamma phase region, can reduce the gamma-alpha phase transition temperature of steel, is beneficial to obtaining a fine phase transition product, and can improve the toughness of the steel and reduce the ductile-brittle transition temperature. However, manganese is an element which is easily segregated, and a band-shaped structure is easily formed when manganese is too high. The Mn content of the invention is 1.75-1.85%.
Ti: n, C, O has strong affinity, is a good deoxidizing and degassing agent and an effective element for fixing N and C, and has good stress corrosion and alkali brittleness resistance because N, C, O is completely fixed when the mass ratio of Ti to C reaches more than 4.5. The fine TiN particles can effectively prevent austenite grains from growing in reheating process of the slab, contribute to improving the solid solubility of Nb in austenite, and have obvious effect on improving the impact toughness of a welding heat affected zone. When the Ti content exceeds 0.025%, the strength of the steel is significantly improved by fine grain strengthening and precipitation strengthening as an alloying element. The Ti content of the invention is 0.045% -0.060%.
Nb: the effect of grain refinement is very obvious, NbC strain is induced and separated out in the hot rolling process to hinder the recovery and recrystallization of the deformed austenite, and the deformed austenite structure in the non-recrystallization area in the finish rolling stage is converted into a fine phase-change product during phase change through controlled rolling and controlled cooling, so that the steel has higher strength and high toughness. Nb is a precious element and has a high cost. The Nb content of the invention is 0.040% -0.055%.
Cr: the hardenability is obviously improved, the generation of polygonal ferrite and pearlite is inhibited, and the formation of ferrite or bainite with a large amount of dislocation distribution in crystal is promoted in medium-temperature and low-temperature regions, so that the strength and the hardness of the steel are improved. And simultaneously, the wear resistance and the corrosion resistance of the steel are improved. The Cr content of the alloy is 0.13-0.18%.
And Als: the aluminum is a common deoxidizer, a small amount of aluminum is added into the steel, so that grains can be refined, the impact toughness is improved, and the content of Als is 0.015-0.045%.
P, S, N: is an inevitable impurity element in steel, the lower the content of the impurity element is, the better the content of the impurity element is, but the lower the content of the impurity element is, the production cost is increased, and the content of P is less than or equal to 0.015 percent, the content of S is less than or equal to 0.004 percent and the content of N is less than or equal to 0.006 percent.
Cold crack susceptibility Pcm: the control of the cold crack sensitivity coefficient is beneficial to ensuring the welding performance of the product, and Pcm of the invention is controlled to be less than or equal to 0.19 percent.
A550 MPa-level hot-rolled coil plate manufacturing method for a drill rod of a rotary drilling rig comprises the following production process flows: pretreatment of molten iron, smelting in a converter, and refining outside the furnace: RH + LF + calcium treatment-continuous casting-slab heating-rolling-ultrafast cooling + laminar cooling-coiling, wherein:
(1) smelting and continuous casting process: the method comprises the following steps of (1) molten iron pretreatment, converter smelting, top blowing or top-bottom combined blowing, external refining, RH vacuum treatment, LF furnace light desulfurization treatment and calcium treatment, wherein [ H ] and [ O ] are fixed in molten steel during RH refining removal, alpha [ O ] is less than or equal to 10ppm, [ H ] is less than or equal to 2ppm, heating is not carried out at RH, silicon-calcium wire feeding treatment is carried out after LF refining, the wire feeding amount of each tank is more than or equal to 500 m, the wire feeding speed is more than or equal to 3.5m/s, the net argon blowing time is more than or equal to 8 min, the calming time is more than or equal to 10 min, the superheat degree of a tundish is less than or equal to 25 ℃, the spheroidization effect of sulfide and oxide inclusions is ensured, the slab is made into a continuous casting slab, the whole course protective casting is carried out, and dynamic soft reduction is carried out, the set value is 3.5-4.0mm, so that the center segregation of the continuous casting slab is reduced;
(2) the rolling process comprises the following steps: the continuous casting plate blank is directly heated in a hot charging furnace at the temperature of 500-.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts the design of low-carbon high-Ti microalloy, adds a small amount of microalloy elements such as Nb, Cr and the like, and controls rolling, ultrafast cooling and laminar cooling processes in two stages to obtain fine acicular ferrite tissues so as to ensure high strength and high toughness and excellent low-temperature fracture toughness. The method specifically comprises the following steps:
(1) the structure of the invention is acicular ferrite structure, the grain size is more than or equal to 12 grade, and the invention has excellent obdurability and good weldability.
(2) The alloy design is simple, the high Ti low C microalloy design is adopted, a small amount of microalloy elements such as Cr, Nb and the like are added, noble elements such as Mo, V and the like are not contained, and the alloy cost is low.
(3) Two-stage controlled cooling is adopted in an ultra-fast cooling and laminar cooling mode, so that fine grains and uniform tissues are ensured, and the steel has high strength and toughness indexes: the yield strength is more than or equal to 580MPa, the tensile strength is more than or equal to 670MPa, and the Charpy impact property at the temperature of minus 20 ℃ is more than or equal to 180J.
Drawings
FIG. 1 shows an acicular ferrite structure according to the present invention.
Detailed Description
The following further describes the embodiments of the present invention with reference to the accompanying drawings, which illustrate examples of the present invention and only describe the best mode of carrying out the invention.
Table 1 shows the chemical compositions of the steels of the examples.
Table 1 examples steel chemical composition (wt%)
Note: pcm is C + Si/30+ (Mn + Cu + Cr)/20+ Ni/60+ Mo/15+ V/10+5B.
The steel plate production process flow comprises molten iron pretreatment, converter smelting, external refining (RH + LF + calcium treatment), continuous casting, slab heating, rolling, ultrafast cooling, laminar cooling and coiling, wherein the smelting process is shown in a table 2, and the rolling process is shown in a table 3.
Table 2: smelting process
Table 3 shows the main mechanical properties of the example steels.
Table 3: rolling process
Table 4 shows the main mechanical properties of the examples
Table 4: main mechanical properties
The straight welded pipe manufactured by the hot-rolled coiled plate has the advantages of low production cost, good strength and toughness, high dimensional precision and the like, and has wide development prospect in the application field of engineering machinery drill pipes.
The foregoing is considered as illustrative only of the principles of the invention and is not to be in any way limiting, since all equivalent changes and modifications are intended to be included within the scope of the appended claims.
Claims (2)
1. The 550 MPa-level hot-rolled coil for the drill rod of the rotary drilling rig is characterized by comprising the following chemical components in percentage by weight: 0.06% -0.08% of C; 0.10 to 0.25 percent of Si; 1.75 to 1.85 percent of Mn; 0.040% -0.055% of Nb; ti 0.045% -0.060%; 0.13 to 0.18 percent of Cr; als 0.015% -0.045%; p is less than or equal to 0.015 percent; s is less than or equal to 0.004 percent; n is less than or equal to 0.006 percent; the balance of iron and inevitable impurities, and the cold crack sensitivity coefficient Pcm of the hot-rolled coil is less than or equal to 0.19 percent.
2. The method for manufacturing the 550 MPa-grade hot-rolled coil for the drill rod of the rotary drilling rig according to claim 1, is characterized by comprising the following production process flows: pretreatment of molten iron, smelting in a converter, and refining outside the furnace: RH + LF + calcium treatment, continuous casting, slab heating, rolling, ultra-fast cooling, laminar cooling and coiling, wherein:
(1) smelting and continuous casting process: the method comprises the following steps of molten iron pretreatment, converter smelting, top blowing or top-bottom combined blowing, external refining, RH vacuum treatment, LF furnace light desulphurization treatment and calcium treatment, wherein [ H ] and [ O ] of molten steel are fixed when in RH refining removal, alpha [ O ] is less than or equal to 10ppm, [ H ] is less than or equal to 2ppm, the temperature is not increased at RH, silicon calcium wire feeding treatment is carried out after LF refining, the wire feeding amount of each tank is more than or equal to 500 m, the wire feeding speed is more than or equal to 3.5m/s, the net argon blowing time is more than or equal to 8 minutes, the calming time is more than or equal to 10 minutes, the superheat degree of a tundish is less than or equal to 25 ℃, continuous casting slabs are continuously cast, the whole process is protected for casting, and dynamic light pressing is carried out, and the set value is 3.5-4.0 mm;
(2) the rolling process comprises the following steps: the continuous casting plate blank is directly heated in a hot charging furnace at the temperature of 500-.
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2022
- 2022-04-28 CN CN202210461372.9A patent/CN115029621B/en active Active
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| CN102851600A (en) * | 2011-06-28 | 2013-01-02 | 鞍钢股份有限公司 | Low-temperature X65 pipeline steel with high toughness and manufacture method thereof |
| CN104278204A (en) * | 2013-07-08 | 2015-01-14 | 鞍钢股份有限公司 | Molybdenum-free pipe coiled plate with excellent low-temperature fracture toughness and production method thereof |
| CN106811700A (en) * | 2015-12-02 | 2017-06-09 | 鞍钢股份有限公司 | A kind of think gauge acid-resisting X60MS hot-rolled coils and its manufacture method |
| CN108315639A (en) * | 2018-01-03 | 2018-07-24 | 承德钢铁集团有限公司 | A kind of high tenacity 600MPa grades of beam steels and its production method |
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