CN111286592A - Production process of hot-rolled X80 pipeline steel with thickness specification of 21.4mm - Google Patents

Production process of hot-rolled X80 pipeline steel with thickness specification of 21.4mm Download PDF

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CN111286592A
CN111286592A CN202010190791.4A CN202010190791A CN111286592A CN 111286592 A CN111286592 A CN 111286592A CN 202010190791 A CN202010190791 A CN 202010190791A CN 111286592 A CN111286592 A CN 111286592A
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equal
less
rolled
percent
casting blank
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徐勇
苗隽
文小明
韩宇
周晏锋
崔宏涛
吴刚
许学利
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Bengang Steel Plates Co Ltd
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Bengang Steel Plates Co Ltd
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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
    • 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
    • B21B37/56—Elongation control
    • 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
    • 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
    • B21B45/02—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 for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • 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
    • B21B45/04—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 for de-scaling, e.g. by brushing
    • B21B45/08—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 for de-scaling, e.g. by brushing hydraulically
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • C22C38/06—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
    • 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • 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
    • 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
    • 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
    • C21D2211/001—Austenite
    • 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
    • C21D2211/002—Bainite
    • 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

Abstract

The invention belongs to the field of steel preparation, and particularly relates to a production process of hot-rolled X80 pipeline steel with the thickness specification of 21.4 mm. The technical scheme of the invention is as follows: a production process of hot-rolled X80 pipeline steel with the thickness specification of 21.4mm comprises the following steps: 1) refining the casting blank; the alloy composition of the casting blank comprises: c: not more than 0.07%, not more than 0.30%, Mn: 1.70-1.80%, P: less than or equal to 0.015 percent, less than or equal to 0.004 percent of S, Alt: less than or equal to 0.06%, N less than or equal to 0.00800%, Mo: 0.12-027%, Cr: 0.15-0.30%, Nb + V + Ti is less than or equal to 0.15%, and the balance is Fe and inevitable impurities; 2) a heating step; 3) a rough rolling process; 4) a finish rolling process; 5) and (5) a coiling step. The technical problem solved by the invention is as follows: when the product is produced in summer, the cooling speed in the rolling process can not meet the requirement, so that ideal acicular ferrite and a small amount of fine dispersed MA tissue can not be achieved, the obdurability matching is poor, the stability of the coil passing performance is poor, and the DWTT does not meet the relevant requirement.

Description

Production process of hot-rolled X80 pipeline steel with thickness specification of 21.4mm
Technical Field
The invention belongs to the field of steel preparation, and particularly relates to a production process of hot-rolled X80 pipeline steel with the thickness specification of 21.4 mm.
Background
The pipeline transportation of oil and natural gas is more economical and faster than other modes, and is the most ideal transportation mode at present. The pipeline transportation is developed towards the direction of large caliber, large wall thickness and high-pressure transportation in order to improve the operation efficiency of pipeline transportation and reduce the cost. Under the conditions of large caliber, large wall thickness and high-pressure conveying, the production and manufacturing of the large caliber, large wall thickness and high-pressure petroleum and natural gas pipelines by adopting the pipeline steel hot-rolled plate coil with thick specification, high strength, high toughness and excellent weldability become the future development trend.
Because the high-grade pipeline steel X80 with the thickness specification of 21.4mm has higher requirements on strength and toughness indexes, higher requirements are provided for pure steel smelting, the contents of S, P, N and O in molten steel must be strictly controlled, the purity of the molten steel is improved, and particularly, when the product is produced in summer, an ideal microstructure cannot be obtained due to the fact that the temperature of cold water in a summer layer is high and the cooling rate cannot meet the requirements, so that a hot-rolled coil with good matching strength and toughness cannot be obtained; and the product also has strict required quality stability, especially the stability of coil passing performance, and simultaneously requires the hydrogen induced cracking resistance of steel, and has strict requirement on dimensional tolerance, so that the product cannot meet the design requirement.
Disclosure of Invention
The invention provides a production process of hot-rolled X80 pipeline steel with the thickness specification of 21.4mm, which solves the technical problems that: when the product is produced in summer, the cooling speed in the rolling process can not meet the requirement, so that ideal acicular ferrite and a small amount of fine dispersed MA tissue can not be achieved, the obdurability matching is poor, the stability of the coil passing performance is poor, and the DWTT does not meet the relevant requirement.
The technical scheme of the invention is as follows:
a production process of hot-rolled X80 pipeline steel with the thickness specification of 21.4mm comprises the following steps:
1) refining the casting blank; the alloy composition of the casting blank comprises: c: not more than 0.07%, not more than 0.30%, Mn: 1.70-1.80%, P: less than or equal to 0.015 percent, less than or equal to 0.004 percent of S, Alt: less than or equal to 0.06%, N less than or equal to 0.00800%, Mo: 0.12-027%, Cr: 0.15-0.30%, Nb + V + Ti is less than or equal to 0.15%, and the balance is Fe and inevitable impurities;
2) a heating step; heating the casting blank in a stepping heating furnace at 1180 +/-20 ℃;
3) a rough rolling process; after the casting blank is discharged from the furnace, high-pressure water descaling is carried out, and then the casting blank is rolled in a rough rolling mill, wherein the rough rolling implementation mode is as follows: 0+ 7; the 1 st pass deformation of R2 is more than or equal to 35mm, and the 2 nd pass deformation is more than or equal to 35 mm; the 6 th pass deformation of R2 is more than or equal to 25 percent, and the 7 th pass deformation is more than or equal to 25 percent; the thickness of the intermediate blank is 55 mm;
4) a finish rolling process; the inlet temperature of the finish rolling is less than or equal to 960 ℃; the reduction rate is as follows: F1-F2 total pressure is 40%; F3-F7 under total pressure of 60%; the temperature range of a finish rolling outlet is 780-800 ℃;
5) a coiling step; the coiling temperature interval is 370-420 ℃, and the cooling speed is as follows: the water temperature in the rolling process is required to be less than or equal to 25 ℃, and the cooling speed is 20-30 ℃/S.
The production process of the hot-rolled X80 pipeline steel with the thickness specification of 21.4mm has the preferable scheme that during summer production, a laminar cooling system and a forced cooling technology are adopted before rolling to reduce the water temperature of cooling water to be less than or equal to 25 ℃.
Wherein: the S and P elements are harmful elements in the steel, the S can cause the steel to generate a hot brittleness phenomenon, namely the steel is easy to crack along a grain boundary during hot pressure processing, and the P is an easy segregation element, so that the steel generates a cold brittleness phenomenon, namely the plasticity and the impact toughness of the steel are sharply reduced at a low temperature, so that the steel becomes brittle. N and O are gas elements, the purity of the steel is reduced, and hot brittleness is also caused due to the fact that the content of O is too high, the plasticity, the toughness, the weldability and the cold bending performance of the steel can be reduced due to the N element, and the timeliness and the cold brittleness are improved. Nb, V and Ti are strong carbide forming elements to generate fine crystal strengthening and precipitation strengthening, the hardenability of the steel can be properly improved by adding a proper amount of Mn and Cr elements, wherein the Cr element and C form composite carbide to enable the steel to have a corrosion resistance effect, Cu can improve the corrosion resistance and strength of the steel and improve the weldability and the machinability, Ni is mainly used for improving the toughness, and the Cu brittleness can be reduced by adding Ni in a composite mode.
The technical difficulties existing in the actual production are that firstly, the greatest difficulty is the stable control of the section range and the coil passing performance of the steel plate, and the difference of the performances of different parts is easy to occur due to the increase of the thickness and the width, so that the DWTT performance is influenced; secondly, due to the influence of high-temperature climate in summer, the water temperature of cooling water of the laminar cooling system reaches 28.7 ℃, the cooling rate after rolling is calculated to be 19.9 ℃/S, and the design requirement of 25 ℃/S is not reached.
The invention has the beneficial effects that:
1. the invention adopts a laminar flow cooling system forced cooling technology to reduce the temperature of cooling water before rolling to reduce the temperature of the cooling water to be less than or equal to 25 ℃, and simultaneously adopts an intermittent sectional cooling mode based on phase change control to be combined with component design, thereby effectively improving the problems, leading the final finished product tissue to be mainly acicular ferrite, simultaneously leading MA islands to be distributed in the ferrite crystal and in the crystal boundary in a punctiform manner, simultaneously leading the MA islands to be more fine and smooth in size and more uniform in distribution, ensuring the final performance of the product and better meeting the requirements of oil and gas pipeline construction.
2. The strain of rough rolling and finish rolling is adjusted, the strain of rough rolling is properly increased to refine austenite grain size, DWTT is facilitated, the strain of finish rolling is properly reduced, the phase change incubation period is delayed, a uniform bainite structure is ensured to be obtained in a wider cooling speed range, meanwhile, an intermittent sectional cooling mode based on phase change control is combined with component design, the temperature gradient of the center and the edge of a thick plate is reduced, the consistency control technology of structure and performance is realized by combining with optimized alloy design, aiming at the problem of high temperature of cold water in a summer layer, the forced cooling technology of a laminar cooling system is adopted to reduce the temperature of cooling water, and the cooling rate after rolling is improved, so that the strength and toughness indexes of pipeline steel are improved.
Detailed Description
The alloy composition of the casting blank comprises: c: not more than 0.07%, not more than 0.30%, Mn: 1.70-1.80%, P: less than or equal to 0.015 percent, less than or equal to 0.004 percent of S, Alt: less than or equal to 0.06%, N less than or equal to 0.00800%, Mo: 0.12-027%, Cr: 0.15-0.30%, Nb + V + Ti is less than or equal to 0.15%, and the balance is Fe and inevitable impurities.
Example 1
Heating the casting blank in a stepping heating furnace at 1180 ℃; after the casting blank is discharged from the furnace, high-pressure water descaling is carried out, and then the casting blank is rolled in a rough rolling mill, wherein the rough rolling implementation mode is as follows: 0+ 7; the 1 st pass deformation of R2 is more than or equal to 35mm, and the 2 nd pass deformation is more than or equal to 35 mm; the 6 th pass deformation of R2 is more than or equal to 25 percent, and the 7 th pass deformation is more than or equal to 25 percent; the thickness of the intermediate blank is 55 mm. The inlet temperature of the finish rolling is less than or equal to 960 ℃; the reduction rate is as follows: F1-F2 total pressure is 40%; F3-F7 under total pressure of 60 percent. Finish rolling outlet temperature: 790 ℃; coiling temperature: 380 ℃; cooling speed: the water temperature in the rolling process is required to be less than or equal to 25 ℃, and the cooling speed is 25 ℃/S.
Product yield strength: 565MPa, tensile strengthStrength: 651MPa, elongation after fracture: 25.5%, yield ratio: 0.87, average value of impact work: 366J, DWTT average: 95% HV10Hardness value: 210.
example 2
Placing the casting blank in a stepping heating furnace for heating, wherein the heating temperature is 1200 ℃; after the casting blank is discharged from the furnace, high-pressure water descaling is carried out, and then the casting blank is rolled in a rough rolling mill, wherein the rough rolling implementation mode is as follows: 0+ 7; the 1 st pass deformation of R2 is more than or equal to 35mm, and the 2 nd pass deformation is more than or equal to 35 mm; the 6 th pass deformation of R2 is more than or equal to 25 percent, and the 7 th pass deformation is more than or equal to 25 percent; the thickness of the intermediate blank is 55 mm. The inlet temperature of the finish rolling is less than or equal to 960 ℃; the reduction rate is as follows: F1-F2 total pressure is 40%; F3-F7 under total pressure of 60 percent. Finish rolling outlet temperature: 800 ℃; coiling temperature: 400 ℃; cooling speed: the water temperature in the rolling process is required to be less than or equal to 25 ℃, and the cooling speed is 25 ℃/S.
Product yield strength: 575MPa, tensile strength: 686MPa, elongation after fracture: 26%, yield ratio: 0.84, average value of impact work: 390J, DWTT average: 98% of HV10Hardness value: 214.

Claims (2)

1. a production process of hot-rolled X80 pipeline steel with the thickness specification of 21.4mm is characterized by comprising the following steps:
1) refining the casting blank; the alloy composition of the casting blank comprises: c: not more than 0.07%, not more than 0.30%, Mn: 1.70-1.80%, P: less than or equal to 0.015 percent, less than or equal to 0.004 percent of S, Alt: less than or equal to 0.06%, N less than or equal to 0.00800%, Mo: 0.12-027%, Cr: 0.15-0.30%, Nb + V + Ti is less than or equal to 0.15%, and the balance is Fe and inevitable impurities;
2) a heating step; heating the casting blank in a stepping heating furnace at 1180 +/-20 ℃;
3) a rough rolling process; after the casting blank is discharged from the furnace, high-pressure water descaling is carried out, and then the casting blank is rolled in a rough rolling mill, wherein the rough rolling implementation mode is as follows: 0+ 7; the 1 st pass deformation of R2 is more than or equal to 35mm, and the 2 nd pass deformation is more than or equal to 35 mm; the 6 th pass deformation of R2 is more than or equal to 25 percent, and the 7 th pass deformation is more than or equal to 25 percent; the thickness of the intermediate blank is 55 mm;
4) a finish rolling process; the inlet temperature of the finish rolling is less than or equal to 960 ℃; the reduction rate is as follows: F1-F2 total pressure is 40%; F3-F7 under total pressure of 60%; the temperature range of a finish rolling outlet is 780-800 ℃;
5) a coiling step; the coiling temperature interval is 370-420 ℃, and the cooling speed is as follows: the water temperature in the rolling process is required to be less than or equal to 25 ℃, and the cooling speed is 20-30 ℃/S.
2. The process for producing a hot-rolled X80 pipeline steel with a thickness specification of 21.4mm according to claim 1, wherein during summer production, a laminar cooling system and a forced cooling technology are used to reduce the temperature of cooling water to less than or equal to 25 ℃ before rolling.
CN202010190791.4A 2020-03-18 2020-03-18 Production process of hot-rolled X80 pipeline steel with thickness specification of 21.4mm Pending CN111286592A (en)

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CN112375968A (en) * 2020-10-20 2021-02-19 包头钢铁（集团）有限责任公司 Production method of hot-rolled steel strip for drill rod of rotary drilling rig

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