CN103160752A - High strength seamless steel pipe with excellent low temperature toughness and manufacturing method thereof - Google Patents
High strength seamless steel pipe with excellent low temperature toughness and manufacturing method thereof Download PDFInfo
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- CN103160752A CN103160752A CN2011104192134A CN201110419213A CN103160752A CN 103160752 A CN103160752 A CN 103160752A CN 2011104192134 A CN2011104192134 A CN 2011104192134A CN 201110419213 A CN201110419213 A CN 201110419213A CN 103160752 A CN103160752 A CN 103160752A
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Abstract
The invention provides a high strength seamless steel pipe with excellent low temperature toughness and manufacturing method thereof. The steel pipe comprises 0.15%-0.20% of C, 0.20%-0.30% of Si, 0.2%-0.5% of Mn, no more than 0.010% of P, no more than 0.003% of S, 0.6%-0.8% of Cr, 0.4%-0.7% of Mo, 1.0%-1.4% of Ni, 0.01%-0.035% of Nb, 0.01-0.05% of Als and the balance of Fe. The method comprises steps of: (1) smelting: pretreated molten iron with sulfur no more than 0.005%; and after smelting: P<=0.010%, S<=0.003%, O<=0.002%, N<=0.006% and H<=0.0002%; (2) manufacturing of round billet: degree of superheat of continuous casting superheat of square billet less than 30 DEG C, casting speed fluctuation less than 0.05m / min, straightening temperature higher than 950 DEG C and square billet heating temperature of 1300-1340DEG C; (3) steel pipe molding: billet heating temperature of 1250-1300 DEG C, piercing temperature higher than 1200 DEG C, continuous rolling temperature higher than 1050 DEG C, and sizing and reducing temperature higher than 800DEG C; and (4) heat treatment: quenching temperature of 900-920 DEG C, tempering temperature of 500-600 DEG C and tempering time longer than 60 min. The product provided by the invention has yield strength of 125ksi, and -60DEG C impact energy greater than 40J.
Description
Technical field
The invention belongs to low alloy steel and make the field, relating in particular to a kind of yield strength is good low-alloy seamless steel pipe and the manufacture method thereof of 125ksi (862MPa) other low-temperature impact toughness of level.
Background technology
Along with industrialized development, the world energy sources growing tension, people begin to consider that land and seabed from cold obtain the energy, the High Strength Steel that the mechanical means construction under cold environment and petroleum drilling and mining, transportation urgent need have excellent low temperature impact toughness.and most of commercially available existing low-carbon (LC) and middle carbon high-strength steel due to intensity when high its toughness lower, the Q125 steel grade oil well casing in API Spec 5CT for example, though intensity can reach 125ksi, but toughness index can only reach 0 ℃ of horizontal 20J, vertical 41J, when the operation envrionment temperature further reduces, its impelling strength is difficult to meet the demands, therefore, use under cold condition, they can only be processed into than low strength, to obtain higher toughness, this will cause the increase of steel product cross-sectional thickness, the weight of product is increased, cost in the time of will causing its cost to be fully utilized than high-strength steel potentiality is high.For this reason, publication number be CN1098359C patented invention a kind of high strength dual phase steel plate with excellent low-temperature flexibility, but its intensity can only guarantee that tensile strength is not less than 830MPa; Equally, publication number is that the yield strength of high-strength and high ductility steel plate of the Japanese Patent invention of JP1985121219 (A) can only reach 700MPa; Though publication number is that intensity and the low-temperature flexibility of the disclosed high-strength and high ductility steel plate of patent of CN 1148416A, CN 101548026A and CN 1146784A is more satisfactory, but its composition, organizational controls harshness, the production control difficulty is larger, large production is difficult to guarantee the stable control of product performance, simultaneously, because the compound of alloy such as Nb, V, Ti, Mo, B, Cu, Mn, Ni add, increased the control difficulty of surface quality of continuously cast slab; It is the patents such as CN 1087357C, CN 1087356C, CN 1986861A that similar sheet material technology also has publication number, but either performance is excellent not, or the production control difficulty is large, is difficult to realize industrialization stably manufactured and stable application.The high-strength and high-toughness steel of above publication invention is only suitable for producing plate, band because composition limits, and the fluctuation of weldquality and welded heat affecting zone tissue, performance is the large inferior position of one.And publication number is the Chinese patent of CN 101343715A, and the yield strength of the weldless steel tube of disclosed excellent in low temperature toughness can only reach 70ksi.
In a word, although a kind of steel pipe and manufacture method with better low-temperature flexibility can be provided, also there is following deficiency in above disclosed patent:
1) publication number is that the patent of CN 1098359C, Japanese Patent, the publication number that publication number is JP1985121219 (A) are the Chinese patent of CN 1986861A, in the situation that obtain more than the intensity of better low-temperature flexibility steel can not reach 100ksi.And the invention product is welded tube, and the fluctuation of weldquality and welded heat affecting zone tissue, performance exists as Hazard Factor all the time.
2) publication number is that patent and the publication number of CN 1087356C, CN 1087357C are the patent of CN1146784A, CN 1148416A, CN 101548026A, though claim and to obtain height and the steel plate that has concurrently of good low-temperature flexibility, but the control difficulty of product manufacture is large, and the quality of the product under the industrial production condition, the stability of performance are difficult for realizing.And the invention product is welded tube, and the fluctuation of weldquality and welded heat affecting zone tissue, performance is another potential Hazard Factor.
3) publication number is the Chinese patent of CN 101343715A, discloses a kind of weldless steel tube and manufacture method thereof of excellent in low temperature toughness, has avoided the impact of welding on steel tube performance, quality homogeneity, but has used only for the situation below yield strength 70ksi.
Summary of the invention
The object of the invention is to overcome the existing defective of above-mentioned prior art, provide a kind of yield strength reach 125ksi (862MPa) and more than, more than-60 ℃ of impelling strength can reach 40J, the mechanical means that is applicable to construct under cold environment or the low-alloy seamless steel pipe of petroleum drilling and mining and manufacture method thereof.
For realizing the present invention, inventors have carried out a large amount of from several aspects such as alloying element screening and proportioning, the control of steel cleanliness factor, process optimization and parameter selection, organization optimizations and the experimental study of system has finally been determined to satisfy the object of the invention alloying element proportioning and manufacturing process.
The present invention be achieved in that this excellent in low temperature toughness the high-strength seamless steel pipe composition by weight percentage: C:0.15%～0.20%, Si:0.20%～0.30%, Mn:0.2%～0.5%, P :≤0.010%, S :≤0.003%, Cr:0.6%～0.8%, Mo:0.4%～0.7%, Ni:1.0%～1.4%, Nb:0.01%～0.035%, Als:0.01%～0.05%, N :≤0.006%, O≤0.002%, H≤0.0002%, all the other are Fe and inevitable impurity.
The explanation that each alloying element scope of the present invention is selected:
C: the Main Function of carbon is to improve hardening capacity, can improve intensity with other carbide that adds up to element to form in steel, carbon content is lower than 0.15%, and the hardening capacity of steel and intensity are difficult to guarantee, but carbon can play destruction to the toughness of steel, and carbon is difficult to guarantee higher than 0.20% low-temperature flexibility.
Si: silicon has been mainly here desoxydatoin, but it is larger to the toughness infringement, therefore it is limited in 0.20～0.30% scope.
Mn: manganese can improve hardening capacity, be combined into MnS with the S element in steel, can avoid the hot short generation of steel, simultaneously Mn can enlarge the austenitic area of steel, can crystal grain thinning, play the effect of the obdurability that improves steel, content is not obvious lower than 0.2% time effect, when content surpasses 0.5%, impels harmful element to begin obviously in the effect of Grain Boundary Segregation, reduce the toughness of high-strength tubing, make simultaneously steel easily produce H 2 S stress corrosion.
P: phosphorus is at grain boundary segregation, and the rising ductile-brittle transition temperature reduces the toughness of steel, it must be limited to below 0.01% here.
S: sulphur easily forms non-hard inclusions with manganese etc., along rolling direction generation extensional, destroys the continuity of material matrix in the course of processing, reduction steel pipe toughness index.Here it must be limited to below 0.003%.
Cr: chromium improves hardening capacity, improves the obdurability of steel, and has anti-corrosion effect, and the obdurability coupling is bad lower than 0.6% the time, and higher than 0.8% the time, saturated to the improvement effect of obdurability, cost increases.
Mo: molybdenum improves hardening capacity, improves the resistance to tempering of steel, suppresses temper brittleness, and its Grain refinement is obvious, and is larger to the obdurability effect that improves steel, and content is lower than 0.4%, and obdurability is difficult to meet the demands, and weakens higher than 0.7% effect, and cost increases.
Als: aluminium adds as strong reductor on the one hand, but crystal grain thinning on the other hand improves the toughness of steel, and in steel, acid-soluble aluminum content effect lower than 0.01% time is not enough, saturated higher than 0.05% effect, and increase and form Al
2O
3The tendency of inclusion increases, and is unfavorable to the low-temperature flexibility of steel.
Ni: nickel is the important alloying element that adds in steel of the present invention, adds nickel in steel and can promote to hand over slippage to occur, and reduces ductile-brittle transition temperature.Nickel is one of the strongest austenite stable element still, can improve hardening capacity and the homogeneity of structure of steel.Reach purpose of the present invention, the addition of nickel is at least 1.0%, simultaneously because nickel expensive, scarcity of resources, in the present invention regulation nickel content on be limited to 1.4%.
Nb: niobium improves the intensity of steel of the present invention by precipitation strength, improves simultaneously the toughness of steel by crystal grain thinning.When the effect lower than 0.01% time of the content of Nb not obvious, when the content of Nb surpasses 0.035% to the contribution of intensity near saturated, and damage the low-temperature flexibility of steel, reduce simultaneously the thermoplasticity of steel of the present invention.Therefore, the content range of restriction Nb is 0.01%～0.035%.
N, O, H: nitrogen, oxygen, hydrogen is as the harmful element in steel, needs to limit its content in steel, otherwise, affect the toughness of steel.
The manufacture method of the high-strength seamless steel pipe of excellent in low temperature toughness of the present invention comprises the following steps:
(1) smelting of steel
Adopt the smelting technology route of hot metal pretreatment+converter smelting+LF refining+VD vacuum outgas, hot metal pretreatment controls to sulphur content below 0.005%, preferably controls to below 0.002%, guarantees that the high-quality low-sulfur molten iron offers converter; Top, the multiple oxygen blast gas smelting molten steel in the end are adopted in converter, the content that adopts smelting Technology for Clean Steel to control P, S, O, N, H harmful element is not more than 0.010%, 0.003%, 0.002%, 0.006%, 0.0002% successively, wherein the time of LF refining is not less than 30min, and the time that vacuum outgas adds the blowing argon gas stirring is not less than 10min;
(2) circular pipe blank manufacturing
For improving the obdurability of material matrix; circular pipe blank adopts bloom continuous casting+rolling mode of circle base to make; billet continuous casting adopts protection casting+induction stirring; control superheating temperature less than 30 ℃; control the induction stirring electric current greater than 500A; pulling rate stability is controlled; fluctuation range is no more than 0.05m/min; control simultaneously straightening temperature more than 950 ℃; avoid the brittle zone aligning; send into soaking pit after continuous casting square billet rolls off the production line and heat, 1300～1340 ℃ of Heating temperatures are carried out the circular pipe blank that roughing cogging and finish rolling are rolled into desired size afterwards.
(3) steel pipe forming
Circular pipe blank adopts rotary heating furnace heating, two roller cone mills to make hollow billet, MPM/PQF tandem rolling unit tube rolling, tiny-tension reducing unit sizing, it is cold to roll laggard line space, wherein the ring furnace Heating temperature is 1250～1300 ℃, hot piercing temperature is not less than 1200 ℃, the hot continuous rolling temperature is not less than 1050 ℃, the sizing temperature is not less than 800 ℃, rolls rear steel pipe air cooling; Decide tube reducing after tube rolling before, preferably employing reheats the samming processing to steel pipe, with refinement, even steel pipe tissue;
(4) thermal treatment
Adopt modified heat treatment mode, 900～920 ℃ of quenching temperatures, quenchant is water, 500～600 ℃ of steel pipe tempering temperatures, tempering time is not less than 60 minutes, adopts the band temperature correction that is not less than 300 ℃ straight after Steel Pipe Heat is processed.
Weldless steel tube through above-mentioned technique manufacturing has following performance:
Yield strength:＞862MPa tensile strength:＞931MPa
Impelling strength: horizontal full-scale Charpy-V impact power (60 ℃)＞40J
Vertical full-scale Charpy-V impact power (60 ℃)＞60J
Unit elongation＞18%.
Manufacturing process of the present invention is simple, be easy to realize, the homogeneity of weldless steel tube performance, good stability, being applicable to cold environment uses, can satisfy yield strength 125ksi (862MPa) ,-60 ℃ of ballistic works greater than the user demand of 40J, adopt weldless steel tube of the present invention can avoid welding the potential application risk that tubing causes due to weld seam, the fluctuation of heat affected zone Performance and quality.
Embodiment
The present invention is further illustrated below by embodiment.
Adopt the Clean Steel smelting technology of hot metal pretreatment+converter smelting+LF refining+VD vacuum outgas, molten iron sulphur≤0.0012%.
Molten steel with composition in table 1 is carried out protective casting with induction stirring; continuous casting becomes the square billet of 280 * 380mm; control superheating temperature during casting less than 30 ℃; control the induction stirring electric current more than or equal to 500A; the pulling rate fluctuation range is controlled in 0.05m/min, controls the straightening temperature and be not less than 950 ℃.Enter the heat tracing that soaking pit carries out 1300～1340 ℃ after continuous casting square billet rolls off the production line, then be rolled into the circular pipe blank of φ 210 sizes through roughing cogging and finish rolling, also can roll into the different sizes such as φ 200, φ 185 according to fished pipe specification needs.
The rolling circular pipe blank that obtains is cut off into needed scale enters rotary heating furnace heating, reheat optionally through two roller cone mill polings, MPM/PQF tandem rolling unit tube rolling, steel pipe after rolling successively that samming is processed, 14 Minimal Tensions are fixed/tube reducing unit sizing, roll after air cooling.Wherein the ring furnace Heating temperature is 1250～1300 ℃, and hot piercing temperature is not less than 1200 ℃, and the hot continuous rolling temperature is not less than 1050 ℃, and the sizing temperature is not less than 800 ℃, obtains matrix and the precipitated phase of refinement.
The hot finished steel pipe that makes is carried out the temper of the Water Quenching+550～600 ℃ of 900～920 ℃, the steel pipe band temperature that goes out tempering stove is aligned, and straightening temperature is not less than 300 ℃.
At last, steel pipe every check and the tube end maching such as detect a flaw, packing warehouse-in.
The chemical composition of product is as shown in table 1, and the main production parameter of employing sees Table 2 and table 3, and the mechanical property of φ 177.8 * 15.88mm weldless steel tube of making through above-mentioned technique is as shown in table 4.
The chemical composition (wt%) of table 1 embodiment of the present invention steel pipe
| Embodiment | C | Si | Mn | P | S | Cr | Mo | Ni | Nb | Als | H | O | N |
| 1 | 0.16 | 0.27 | 0.33 | 0.005 | 0.002 | 0.69 | 0.65 | 1.23 | 0.012 | 0.040 | 0.0001 | 0.0015 | 0.0046 |
| 2 | 0.15 | 0.30 | 0.45 | 0.006 | 0.001 | 0.74 | 0.70 | 1.02 | 0.025 | 0.027 | 0.00009 | 0.0017 | 0.0049 |
| 3 | 0.18 | 0.21 | 0.50 | 0.009 | 0.003 | 0.80 | 0.52 | 1.31 | 0.032 | 0.012 | 0.00008 | 0.0020 | 0.0041 |
| 4 | 0.20 | 0.024 | 0.21 | 0.007 | 0.002 | 0.62 | 0.43 | 1.40 | 0.016 | 0.035 | 0.00011 | 0.0014 | 0.0039 |
| Comparative Examples | 0.28 | 0.35 | 1.20 | 0.012 | 0.004 | 1.12 | 0.38 | - | - | 0.031 | 0.10 | 0.0024 | 0.0061 |
The main technologic parameters of the steel-making of table 2 embodiment of the present invention and base
| Embodiment | Superheating temperature/℃ | Induction stirring electric current/A | Pulling rate fluctuation/m/min | The straightening temperature/℃ | Continuous blank heating temperature/℃ |
| 1 | 26 | 505 | 0.03 | 955 | 1305 |
| 2 | 23 | 500 | 0.04 | 970 | 1335 |
| 3 | 24 | 505 | 0.02 | 960 | 1320 |
| 4 | 27 | 505 | 0 | 970 | 1315 |
| Comparative Examples | 25 | 500 | 0 | 965 | 1310 |
Table 3 embodiment of the present invention tubulation and thermal treatment main technologic parameters
| Embodiment | Perforation/℃ | Tube rolling/℃ | Reheat/℃ | Sizing/℃ | Quenching temperature, time/℃, min | Tempering temperature, time/℃, min |
| 1 | 1220 | 1100 | - | 854 | 910，45 | 560，60 |
| 2 | 1245 | 1080 | - | 862 | 920，45 | 550，60 |
| 3 | 1230 | 1120 | - | 867 | 900，45 | 580，90 |
| 4 | 1235 | 1090 | 900 | 881 | 900，45 | 600，90 |
| Comparative Examples | 1225 | 1100 | - | 860 | 900，45 | 630，90 |
The mechanical property of table 4 embodiment of the present invention steel pipe
Claims (4)
1. the high-strength seamless steel pipe of an excellent in low temperature toughness, it is characterized in that its composition weight percent is: C:0.15%～0.20%, Si:0.20%～0.30%, Mn:0.2%～0.5%, P :≤0.010%, S :≤0.003%, Cr:0.6%～0.8%, Mo:0.4%～0.7%, Ni:1.0%～1.4%, Nb:0.01%～0.035%, Als:0.01%～0.05%, N :≤0.006%, O≤0.002%, H≤0.0002%, all the other are Fe and inevitable impurity.
2. the manufacture method of the described high-strength seamless steel pipe of claim 1, it is characterized in that comprising the following steps: the smelting of (1) steel: sulphur content after hot metal pretreatment≤0.005%, P content after smelting≤0.010%, S content≤0.003%, O content≤0.002%, N content≤0.006%, H content≤0.0002%, the LF refining time is greater than 30min, and vacuum outgas adds the blowing argon gas churning time greater than 10min; (2) circular pipe blank manufacturing: bloom continuous casting adopts protection casting+induction stirring, control superheating temperature less than 30 ℃, the induction stirring electric current is more than or equal to 500A, the pulling rate fluctuation range is no more than 0.05m/min, straightening temperature is more than 950 ℃, continuous casting square billet send 1300～1340 ℃ of soaking pit Heating temperatures, then is rolled into the circular pipe blank of desired size through roughing cogging and finish rolling; (3) steel pipe forming: circular pipe blank is made hollow billet through rotary heating furnace heating, two roller cone mills, 1250～1300 ℃ of Heating temperatures, piercing temperature is greater than 1200 ℃, again through MPM/PQF tandem rolling unit tube rolling, the tandem rolling temperature is greater than 1050 ℃, with the tiny-tension reducing unit sizing of temperature greater than 800 ℃, roll rear air cooling; (4) thermal treatment: 900～920 ℃ of quenching temperatures, 500～600 ℃ of tempering temperatures, tempering time adopted greater than the band temperature correction of 300 ℃ straight greater than 60 minutes afterwards.
3. the manufacture method of high-strength seamless steel pipe according to claim 2 is characterized in that sulphur content 0.002% after hot metal pretreatment.
4. the manufacture method of high-strength seamless steel pipe according to claim 2 is characterized in that deciding after tube rolling before tube reducing steel pipe is adopted reheating samming and processing.
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| CN104419868A (en) * | 2013-09-05 | 2015-03-18 | 鞍钢股份有限公司 | P110 externally-thickened oil well tube and manufacturing method thereof |
| CN104419872A (en) * | 2013-09-05 | 2015-03-18 | 鞍钢股份有限公司 | X52 seamless pipeline tube having HIC resistance and manufacturing method thereof |
| CN104419870A (en) * | 2013-09-05 | 2015-03-18 | 鞍钢股份有限公司 | X42 seamless line pipe with anti-HIC (hybrid integrated circuit) performance and manufacturing method thereof |
| CN107385355A (en) * | 2017-06-20 | 2017-11-24 | 衡阳华菱钢管有限公司 | Seamless steel pipe, its manufacture method and heavy oil thermal recovery casing pipe |
| CN108048737A (en) * | 2017-11-28 | 2018-05-18 | 兰州兰石集团有限公司 | Main load-bearing part steel of drilling lifting means and preparation method thereof |
| CN109055873A (en) * | 2018-10-08 | 2018-12-21 | 鞍钢股份有限公司 | A kind of 140ksi grade of steel seamless steel pipe and its manufacturing method |
| CN110202106A (en) * | 2019-06-04 | 2019-09-06 | 甘肃酒钢集团宏兴钢铁股份有限公司 | The method for controlling CSP thin sheet continuous casting machine production medium carbon alloy steel slab surface cracks |
| CN110656287A (en) * | 2019-09-30 | 2020-01-07 | 鞍钢股份有限公司 | Seamless steel pipe for high-strength drill rod and manufacturing method thereof |
| CN111074050A (en) * | 2019-11-25 | 2020-04-28 | 鞍钢股份有限公司 | High-strength high-toughness thick-specification steel plate for containment of pressurized water reactor nuclear power station and production method thereof |
| CN112011735A (en) * | 2020-08-03 | 2020-12-01 | 鞍钢股份有限公司 | Economical low-temperature steel pipe with good corrosion resistance and manufacturing method thereof |
| CN112593145A (en) * | 2020-11-10 | 2021-04-02 | 鞍钢股份有限公司 | Hot-rolled Q345 seamless steel tube and manufacturing method thereof |
| CN112981256A (en) * | 2021-02-09 | 2021-06-18 | 鞍钢股份有限公司 | Low-cost hot rolling production method of Q345D seamless steel tube |
| CN114045438A (en) * | 2021-11-17 | 2022-02-15 | 成都先进金属材料产业技术研究院股份有限公司 | High-strength and high-toughness seamless steel pipe and preparation method thereof |
| CN115491610A (en) * | 2022-10-26 | 2022-12-20 | 本钢板材股份有限公司 | Round steel for oil drilling and production bent pipe and preparation method thereof |
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|---|---|---|---|---|
| CN104419868A (en) * | 2013-09-05 | 2015-03-18 | 鞍钢股份有限公司 | P110 externally-thickened oil well tube and manufacturing method thereof |
| CN104419872A (en) * | 2013-09-05 | 2015-03-18 | 鞍钢股份有限公司 | X52 seamless pipeline tube having HIC resistance and manufacturing method thereof |
| CN104419870A (en) * | 2013-09-05 | 2015-03-18 | 鞍钢股份有限公司 | X42 seamless line pipe with anti-HIC (hybrid integrated circuit) performance and manufacturing method thereof |
| CN107385355A (en) * | 2017-06-20 | 2017-11-24 | 衡阳华菱钢管有限公司 | Seamless steel pipe, its manufacture method and heavy oil thermal recovery casing pipe |
| CN108048737A (en) * | 2017-11-28 | 2018-05-18 | 兰州兰石集团有限公司 | Main load-bearing part steel of drilling lifting means and preparation method thereof |
| CN109055873A (en) * | 2018-10-08 | 2018-12-21 | 鞍钢股份有限公司 | A kind of 140ksi grade of steel seamless steel pipe and its manufacturing method |
| CN110202106A (en) * | 2019-06-04 | 2019-09-06 | 甘肃酒钢集团宏兴钢铁股份有限公司 | The method for controlling CSP thin sheet continuous casting machine production medium carbon alloy steel slab surface cracks |
| CN110656287A (en) * | 2019-09-30 | 2020-01-07 | 鞍钢股份有限公司 | Seamless steel pipe for high-strength drill rod and manufacturing method thereof |
| CN110656287B (en) * | 2019-09-30 | 2021-02-23 | 鞍钢股份有限公司 | Seamless steel pipe for high-strength drill rod and manufacturing method thereof |
| CN111074050A (en) * | 2019-11-25 | 2020-04-28 | 鞍钢股份有限公司 | High-strength high-toughness thick-specification steel plate for containment of pressurized water reactor nuclear power station and production method thereof |
| CN112011735A (en) * | 2020-08-03 | 2020-12-01 | 鞍钢股份有限公司 | Economical low-temperature steel pipe with good corrosion resistance and manufacturing method thereof |
| CN112593145A (en) * | 2020-11-10 | 2021-04-02 | 鞍钢股份有限公司 | Hot-rolled Q345 seamless steel tube and manufacturing method thereof |
| CN112981256A (en) * | 2021-02-09 | 2021-06-18 | 鞍钢股份有限公司 | Low-cost hot rolling production method of Q345D seamless steel tube |
| CN114045438A (en) * | 2021-11-17 | 2022-02-15 | 成都先进金属材料产业技术研究院股份有限公司 | High-strength and high-toughness seamless steel pipe and preparation method thereof |
| CN115491610A (en) * | 2022-10-26 | 2022-12-20 | 本钢板材股份有限公司 | Round steel for oil drilling and production bent pipe and preparation method thereof |
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