CN109930066A - A kind of hydrogen sulfide corrosion resistant low temperature seamless line pipe and preparation method thereof - Google Patents
A kind of hydrogen sulfide corrosion resistant low temperature seamless line pipe and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of hydrogen sulfide corrosion resistant low temperature seamless line pipe, chemical component includes: C≤0.16%；Si 0.20~0.35%；Mn 0.10~1.10%；P≤0.018%；S≤0.005%；Cr≤0.30%；Mo≤0.15%；Nb+V+Ti≤0.13%；Remaining is that Fe and inevitable impurity, mass fraction amount to 100%.Preparation method is also disclosed.The present invention is using hydrogen sulfide corrosion resistant low temperature line pipe use condition as starting point, based on low C, low Mn, low P and low S, by the rational proportion of microalloy element, V-type side knock function under yield strength >=380MPa, -60 DEG C of experimental situations is produced by techniques such as steel-making, tube rolling, heat treatment and processing and is higher than 50J (half-size scale), by the anti-corrosion low-temperature seamless line pipe of HIC and SSC test evaluation.
Description
Technical field
The present invention relates to metallurgical material technical field more particularly to a kind of hydrogen sulfide corrosion resistant low temperature seamless line pipe and
Preparation method.
Background technique
With the continuous development of industrial gas oil, the exploitation of petroleum resources gradually turns to opening for unconventional petroleum resources
Hair, accounting reach about 80%, are the emphasis of the following exploitation.Unconventional petroleum resources are typically distributed about remote and geographical environment and dislike
Bad region, this gives pipe-line construction and the selection of pipe, and more stringent requirements are proposed.For ensure pipe-line safe operation,
Steel pipe both needs high intensity, should also there is excellent low-temperature flexibility and acid resistance.Oil and gas field is divided into " sweet gas " and " acid gas ",
Generally, it is known as " sweet gas " by the natural gas of desulfurization process, it is on the contrary then be known as " acid gas ".In the explored oil gas field in the world about
There is 1/3 to contain hydrogen sulfide gas.The higher acid petroleum of transport of H 2S content or natural gas can have corrosiveness to pipeline, especially
It is that cryogenic vulcanization hydrogen-type corrosion belongs to local failure, is difficult to be detected and be prevented.To avoid corrosive pipeline from failing, therefore convey this
Class oil gas just needs pipeline to have HIC (hydrogen induced cracking (HIC)) drag and SSC (sulphide stress corrosion) drag.
It in summary it can be seen, the demand of hydrogen sulfide corrosion resistant low temperature line pipe is increasing, has a vast market.
Wherein, common grade of steel of the X52 level pipeline pipeline pipe as pipeline engineering, especially branch line engineering, demand is huge, simultaneously because carbon
The limitation of equivalent, X52 steel grade sulfur resistant hydrogen-type corrosion line pipe production difficulty are very big.
Summary of the invention
The object of the present invention is to provide a kind of hydrogen sulfide corrosion resistant low temperature seamless line pipes, with hydrogen sulfide corrosion resistant low temperature
It is starting point with line pipe use condition, with low C, based on low Mn, low P and low S, passes through the microalloys such as Cr, Mo, Nb, Ti
The rational proportion of element produces yield strength >=380MPa, -60 DEG C of realities by techniques such as steel-making, tube rolling, heat treatment and processing
It tests V-type side knock function under environment and is higher than 50J (half-size scale), the anti-corrosion low-temperature seamless pipe by HIC and SSC test evaluation
Spool.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of hydrogen sulfide corrosion resistant low temperature seamless line pipe, chemical element and its mass percentage are as follows: C≤
0.16%；Si 0.20~0.35%；Mn 0.10~1.10%；P≤0.018%；S≤0.005%；Cr≤0.30%；Mo≤
0.15%；Nb+V+Ti≤0.13%；Remaining is that Fe and inevitable impurity, mass fraction amount to 100%.
Further, chemical element and its mass percentage are as follows: C:0.14%；Si:0.26%；Mn:1.03%；
P:0.014；S:0.004；Cr:0.18；Mo:0.095；Nb:0.031；Ti:0.016；Remaining is Fe and inevitable impurity,
Mass fraction amounts to 100%.
Further, chemical element and its mass percentage are as follows: C:0.14%；Si:0.28%；Mn:1.01%；
P:0.013；S:0.004；Cr:0.19；Mo:0.106；Nb:0.034；Ti:0.013；Remaining is Fe and inevitable impurity,
Mass fraction amounts to 100%.
Further, chemical element and its mass percentage are as follows: C:0.13%；Si:0.29%；Mn:0.98%；
P:0.014；S:0.003；Cr:0.18；Mo:0.095；Nb:0.030；Ti:0.014；Remaining is Fe and inevitable impurity,
Mass fraction amounts to 100%.
Further, chemical element and its mass percentage are as follows: C:0.14%；Si:0.28%；Mn:0.99%；
P:0.011；S:0.004；Cr:0.20；Mo:0.098；Nb:0.029；Ti:0.016；Remaining is Fe and inevitable impurity,
Mass fraction amounts to 100%.
Further, chemical element and its mass percentage are as follows: C:0.12%；Si:0.26%；Mn:1.05%；
P:0.013；S:0.004；Cr:0.19；Mo:0.104；Nb:0.028；Ti:0.015；Remaining is Fe and inevitable impurity,
Mass fraction amounts to 100%.
Carbon (C): as intensified element most economical, most basic in steel, by solution strengthening and precipitation strength to raising steel
Intensity have obvious effect, but excessively high carbon content adversely affects the extension of steel, toughness and weldability, while it is easier that
Alloying element carbide is precipitated in crystal boundary, declines so as to cause the decline of steel grade corrosion resistance, especially sulfur resistance, the present invention
Control appropriate is carried out to carbon content and improves the toughness and solderability of steel, for purposes of the invention, C while ensureing intensity
Content≤0.14%.
Manganese (Mn): Mn can greatly improve the intensity and toughness of steel grade by solution strengthening, be that compensation is drawn because C content reduces
The main and most economical intensified element and effective deoxidier of loss of strength are played, and has the function of de- S, still
Excessively high Mn can promote the formation of carbide, to reduce the toughness and corrosion resistance of steel grade；Mn can be infinitely mutual with γ-Fe
It is molten, the area γ is expanded, increases the harden ability of steel, but excessively high Mn has the tendency that increasing austenite grows up, and easily makes coarse grains, makes
Steel has superheated susceptivity and temper brittleness, while reducing the welding performance of steel.Therefore, for purposes of the invention, Mn content range is
0.10~1.10%.
Chromium (Cr): Cr can improve the thermodynamic stability of steel, block the anodic process of electrochemical corrosion, can be to a certain degree
The carbon dioxide corrosion-resistant of steel is improved, while improving the anti-local corrosion of steel grade and homogeneous corrosion ability, but Cr too high levels can be led
The decline of steel grade welding performance is caused, while the carbide of Cr is easy to cause steel grade sulfur resistance to decline in the segregation of crystal boundary, therefore, Cr
Content≤0.3%.
Molybdenum (Mo): Mo can reduce the area γ, the precipitation of strong inhibition pro-eutectoid ferrite and growth process, promote high density position
The formation of the acicular ferrite of wrong substructure, to control, phase-change organization plays an important role, and refines tissue further, passes through tissue
Phase transformation strengthening improve the intensity of steel；In quenched and tempered steel, Mo can also improve the harden ability of steel, prevent or reduce steel belt roof bolt
Brittleness improves steel belt roof bolt stability；In addition a small amount of that the anti-office that can effectively increase steel is added because Mo is large atomic radius element
Portion's corrosion and resisting corrosion of chlorine ion, can also improve the hydrogen sulfide corrosion resistant ability of steel.Therefore, Mo content of the present invention≤
0.15%.
Niobium, vanadium, titanium (Nb, V, Ti): there is strong binding ability to form respective carbide, nitridation by Nb, V, Ti and C, N
Object or carbonitride have strong refinement crystal grain and precipitation strength effect, greatly improve the mechanical property of steel grade.Nb is in steel
Feature is exactly to improve the recrystallization temperature of austenite, to achieve the purpose that fining austenite grains, micro Nb can make steel completely
Fabulous comprehensive performance is obtained, Nb too high levels cause steel to be easy to appear mixed crystal；Ti's forms small stable in continuous-casting of steel billet
Precipitated phase, this precipitated phase can effectively hinder Austenite Grain Growth when heated, help to improve Nb in austenite
Solid solubility, while there is obvious effect to the impact flexibility for improving welding heat affected zone.But when the content of Nb, V, Ti are more than
When 0.1%, precipitated phase particle can be made coarse, and oxide is mingled with and is increased, had an adverse effect instead, reduce simultaneously
The welding performance of steel grade.Therefore, Nb+V+Ti≤0.13% in the present invention.
A kind of preparation method of hydrogen sulfide corrosion resistant low temperature seamless line pipe, including following technique:
Steel-smelting production process are as follows: molten iron pretreatment → converter smelting → LF refining → VD degassing → round billet continuous casting.Supplied materials iron
Water must carry out molten iron pretreatment, to guarantee the molten steel quality of supply converter.To inhibit gas content in material, silicomanganese, manganese
Iron, ferrochrome, molybdenum-iron, ferro-niobium and ferrotianium before addition must deoxidation alloyings；Converter terminal controls target: C >=0.06%, P
≤ 0.015%；It is smelted using single slag technique, finishing slag basicity >=3.0；Necessary pushing off the slag when tapping, pushing off the slag failure must skim；In LF
It refines in link, slag making desulfurization, composition adjustment and warming temperature, VD depth vacuum degree mesh is carried out according to converter molten steel ingredient and temperature
Scale value≤0.06Kpa, deep vacuum time >=15 minute after VD, feed appropriate silicon-calcium wire, and soft blow Ar is not less than 15 after feeding silk
Minute, to guarantee lower gas content in material；Continuous casting process use electromagnetic agitation technique, molten steel overheat Δ T≤30 DEG C,
According to the suitable pulling rate perseverance pulling rate production of different round billet section selections, round billet should enter burial pit and carry out slow cooling, enter to cheat temperature and be greater than
600 DEG C, slow cooling time is not less than 48 hours.The uniform high quality round billet of low P, low S, ingredient is obtained by this method.
Tube-rolling technique are as follows: round billet → sawing → annular stove heating → perforation → PQF tandem rolling → sizing → cooling.Annular furnace is protected
Temperature section temperature is 1200-1300 DEG C, and temperature is 1200-1250 DEG C after round billet perforation；Tandem rolling inlet temperature is 1050-1150 DEG C；
Temperature is 850-950 DEG C after sizing
Further, shape furnace soaking zone temperature is 1260 DEG C, and temperature is 1220 DEG C after round billet perforation；Tandem rolling inlet temperature is
1100℃；Temperature is 900 DEG C after sizing.High-end controlling hot rolling technology is combined to obtain by three roller retained-mandrel MPM group PQF
Various sizes of high-precision high-quality tube body.
Heat treatment process are as follows: use normalized treatment, normalizing temperature is 900 DEG C~920 DEG C, keeps the temperature 40 minutes or so, normalizing
Sizing straightening temperature is not less than 500 DEG C afterwards.By reasonable heat treatment technics, steel pipe residual stress technology is controlled, surface is obtained
The line pipe of quality and high comprehensive performance, not only has a high-intensitive and good corrosion resistance, and with excellent low
Warm toughness.
Compared with prior art, advantageous effects of the invention:
The present invention leads to the reasonable selection of microalloy element, and appropriate constituent content proportion makes steel grade that there is lower carbon to work as
Amount, and be readily produced, at low cost, reasonably smelting continuous casting process, rolling mill practice and heat treatment process keeps steel pipe with higher
Intensity, excellent low-temperature impact toughness, good corrosion resistance and high dimensional accuracy.It can be used as delivery pipe, be widely applied
In the hydrogen sulfide containing acid-soluble oil gas field of extremely frigid zones, have the characteristics that easy to produce, inexpensive, easy welding, function admirable.
The present invention overcomes low-carbon-equivalent and high-intensitive contradictory limitation, product have good weldability, low yield tensile ratio,
The performances such as excellent low temperature impact properties and resistance to H2S corrosion, meet the requirement of transporting low temperature hydrogen sulfide oil gas operating condition, are enterprise
Bring biggish economic benefit and social benefit.
Detailed description of the invention
The invention will be further described for explanation with reference to the accompanying drawing.
Fig. 1 is metallographic structure schematic diagram of the invention；
Specific embodiment
By the steel pipe tubing that the present invention obtains, by taking 323.9 × 9mm of production specification Φ as an example, the chemical component of each embodiment
Such as table 1:
Each embodiment steel pipe chemical component statistical result wt% of table 1
| Embodiment | C | Si | Mn | P | S | Cr | Mo | Nb | Ti |
| 1 | 0.14 | 0.26 | 1.03 | 0.014 | 0.004 | 0.18 | 0.095 | 0.031 | 0.016 |
| 2 | 0.14 | 0.28 | 1.01 | 0.013 | 0.004 | 0.19 | 0.106 | 0.034 | 0.013 |
| 3 | 0.13 | 0.29 | 0.98 | 0.014 | 0.003 | 0.18 | 0.095 | 0.030 | 0.014 |
| 4 | 0.14 | 0.28 | 0.99 | 0.011 | 0.004 | 0.20 | 0.098 | 0.029 | 0.016 |
| 5 | 0.12 | 0.26 | 1.05 | 0.013 | 0.004 | 0.19 | 0.104 | 0.028 | 0.015 |
Steel pipe chemical component fully meets requirement of the present invention to steel grade, P and S content is lower, meets ingredient design requirement,
And each furnace component content deviation very little, stable component content are conducive to carry out temperature control when heat treatment as can be seen from Table 1
System, to have good tissue and performance to provide precondition for tubing.
Process for making: the steel pipe of 323.9 × 9mm of production specification Φ uses continuous cast round billets section for Φ 390mm, Baogang's steel
Guan company fan-shaped sections of steelmaking continuous casting machines arc radius is 12m.In order to overcome small arc radius production big cross section round billet to be easy to produce round billet
The problem of crizzle, especially takes a series of arrange to the steel grade of crack-sensitivity containing microalloy elements such as Nb, V, Ti
It applies, such as Nb, V, Ti content appropriate and proportion；Continuous casting stablizes pulling rate, guarantees that continuous casting billet crosses straightening section temperature not less than 900 DEG C；
Using weak and uniform secondary cooling system；Suitable covering slag is selected, casting machine centering, arc aligning accuracy are improved；After slab is offline, round billet
Into burial pit slow cooling, enter to cheat temperature greater than 600 DEG C, to eliminate structural stress and thermal stress.By the above measure, height has been obtained
Quality round billet.
Tube-rolling technique are as follows: round billet → sawing → annular stove heating → perforation → PQF tandem rolling → sizing → cooling.Round billet is in ring
Heating in shape furnace, furnace temperature are 1280 DEG C, and heating of pipe blank temperature deviation ± 10 DEG C, time inside furnace is unsuitable too long, and perforation uses low speed
It bites, the technique of high-speed rolling, wearing rear temperature is 1220 DEG C, and entering tandem mill temperature is 1100 DEG C, and temperature is 890 DEG C after sizing,
It is cooling, sawing.
Heat treatment: using normalized treatment normalizing temperature for 910 DEG C, keeps the temperature 60 minutes or so, sizing straightening temperature after normalizing
Not less than 500 DEG C, and detect a flaw.
Line pipe geometric dimension of the invention:
Diameter range: 322.28~325.52 (- 0.5%D~+0.5%D)；
Wall thickness range: 8.28~9.90 (- 8%t~+10%t)；
Out-of-roundness: entirety≤1%OD；
Straight degree: it is whole≤0.15%, away from pipe end 1000mm, tip bend≤3.0mm.
Line pipe dimensional accuracy of the invention is high, the weld job being easy between steel pipe.
Mechanical properties of pipe of the invention is as shown in table 2.As seen from Table 2, method of the invention is well positioned to meet sulfur resistive
Change the requirement of hydrogen-type corrosion cryogenic steel pipe, the steel strength of 323.9 × 9mm of specification Φ reaches X52 grade of steel, yield tensile ratio very little, tool
There is excellent low-temperature impact toughness, -60 DEG C of side knocks are greater than 50J (half-size scale), and hardness number is also very low, to guarantee that steel pipe has
There is very high corrosion resistance.
The mechanical properties of pipe of the present invention of table 2
Note: impact specimen is having a size of half-size scale.
The field trash and tissue grain size of steel pipe of the invention are as shown in table 3, and metallographic structure figure is as shown in Figure 1.
The steel pipe of the present invention of table 3 and sundries and tissue grain size
Note: F indicates that ferrite, P indicate pearlite
The HIC test result of steel pipe of the invention is as shown in table 4, from table 4, it can be seen that steel pipe flawless and specimen surface
Without hydrogen blister, show the Properties of HIC resistance for having excellent.Steel pipe of the invention has also carried out SSC test, and the results are shown in Table 5,
720 hours, sample did not cracked, is not cracked, and surface steel pipe has excellent resistance against sulfide stress cracking performance.
The HIC test result of the present invention of table 4
The SSC test result of the present invention of table 5
Reach X52 grade of steel, the conjunction of microalloy element using the steel strength of 323.9 × 9mm of specification Φ produced by the invention
Reason selection, appropriate constituent content proportion, makes steel grade have lower carbon equivalent, is easy to weld, and be readily produced, at low cost,
Reasonable continuous casting process, rolling mill practice and the heat treatment process of smelting keeps steel pipe intensity with higher, excellent low-temperature impact tough
Property, good corrosion resistance and high dimensional accuracy.It can be used as delivery pipe, be widely used in conveying extremely frigid zones sulfide hydrogen
Acid-soluble oil gas field, have the characteristics that easy to produce, inexpensive, function admirable.
Embodiment described above is only that preferred embodiment of the invention is described, and is not carried out to the scope of the present invention
It limits, without departing from the spirit of the design of the present invention, those of ordinary skill in the art make technical solution of the present invention
Various changes and improvements, should all fall into claims of the present invention determine protection scope in.
Claims (8)
1. a kind of hydrogen sulfide corrosion resistant low temperature seamless line pipe, which is characterized in that its chemical element and its mass percentage
It is as follows: C≤0.16%；Si 0.20~0.35%；Mn 0.10~1.10%；P≤0.018%；S≤0.005%；Cr≤
0.30%；Mo≤0.15%；Nb+V+Ti≤0.13%；Remaining is that Fe and inevitable impurity, mass fraction amount to
100%.
2. hydrogen sulfide corrosion resistant low temperature seamless line pipe according to claim 1, which is characterized in that its chemical element and
Its mass percentage is as follows: C:0.14%；Si:0.26%；Mn:1.03%；P:0.014；S:0.004；Cr:0.18；Mo:
0.095；Nb:0.031；Ti:0.016；Remaining is that Fe and inevitable impurity, mass fraction amount to 100%.
3. hydrogen sulfide corrosion resistant low temperature seamless line pipe according to claim 1, which is characterized in that its chemical element and
Its mass percentage is as follows: C:0.14%；Si:0.28%；Mn:1.01%；P:0.013；S:0.004；Cr:0.19；Mo:
0.106；Nb:0.034；Ti:0.013；Remaining is that Fe and inevitable impurity, mass fraction amount to 100%.
4. hydrogen sulfide corrosion resistant low temperature seamless line pipe according to claim 1, which is characterized in that its chemical element and
Its mass percentage is as follows: C:0.13%；Si:0.29%；Mn:0.98%；P:0.014；S:0.003；Cr:0.18；Mo:
0.095；Nb:0.030；Ti:0.014；Remaining is that Fe and inevitable impurity, mass fraction amount to 100%.
5. hydrogen sulfide corrosion resistant low temperature seamless line pipe according to claim 1, which is characterized in that its chemical element and
Its mass percentage is as follows: C:0.14%；Si:0.28%；Mn:0.99%；P:0.011；S:0.004；Cr:0.20；Mo:
0.098；Nb:0.029；Ti:0.016；Remaining is that Fe and inevitable impurity, mass fraction amount to 100%.
6. hydrogen sulfide corrosion resistant low temperature seamless line pipe according to claim 1, which is characterized in that its chemical element and
Its mass percentage is as follows: C:0.12%；Si:0.26%；Mn:1.05%；P:0.013；S:0.004；Cr:0.19；Mo:
0.104；Nb:0.028；Ti:0.015；Remaining is that Fe and inevitable impurity, mass fraction amount to 100%.
7. a kind of preparation method of hydrogen sulfide corrosion resistant low temperature seamless line pipe characterized by comprising
Steel-smelting production process are as follows: molten iron pretreatment → converter smelting → LF refining → VD degassing → round billet continuous casting；Supplied materials molten iron into
Row molten iron pretreatment, thus guarantee supply converter molten steel quality, for inhibit material in gas content, silicomanganese, manganese iron, ferrochrome,
Molybdenum-iron, ferro-niobium and ferrotianium carry out deoxidation alloying before addition；Converter terminal control target: C >=0.06%, P≤
0.015%；It is smelted using single slag technique, finishing slag basicity >=3.0；Pushing off the slag when tapping, pushing off the slag failure are then skimmed；In LF refining link
In, slag making desulfurization, composition adjustment and warming temperature are carried out according to converter molten steel ingredient and temperature, VD depth vacuum degree target value≤
0.06Kpa, deep vacuum time >=15 minute after VD, feed appropriate silicon-calcium wire, and soft blow Ar is not less than 15 minutes after feeding silk,
To guarantee lower gas content in material；Continuous casting process use electromagnetic agitation technique, molten steel overheat Δ T≤30 DEG C, according to
The different suitable pulling rate perseverance pulling rate productions of round billet section selection, round billet enter burial pit and carry out slow cooling, enter to cheat temperature and be greater than 600 DEG C,
Slow cooling time is not less than 48 hours；
Tube-rolling technique are as follows: round billet → sawing → annular stove heating → perforation → PQF tandem rolling → sizing → cooling；Annular furnace soaking zone
Temperature is 1200-1300 DEG C, and temperature is 1200-1250 DEG C after round billet perforation；Tandem rolling inlet temperature is 1050-1150 DEG C；Sizing
Temperature is 850-950 DEG C afterwards；
Heat treatment process are as follows: use normalized treatment, normalizing temperature is 900 DEG C~920 DEG C, keeps the temperature 40 minutes or so, fixed after normalizing
Diameter straightening temperature is not less than 500 DEG C.
8. preparation method according to claim 7, which is characterized in that annular furnace soaking zone temperature is 1260 DEG C, and round billet is worn
Temperature is 1220 DEG C behind hole；Tandem rolling inlet temperature is 1100 DEG C；Temperature is 900 DEG C after sizing.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021027188A1 (en) * | 2019-08-14 | 2021-02-18 | 南京钢铁股份有限公司 | Method for producing ultra-low-temperature high-strength acid-resistant container steel by means of casting blank |
| CN112853150A (en) * | 2021-01-12 | 2021-05-28 | 鞍钢股份有限公司 | Copper-steel solid-liquid composite bimetallic material for chemical industry and preparation method thereof |
| CN113234988A (en) * | 2021-04-15 | 2021-08-10 | 华南理工大学 | Method for producing weathering steel with yield strength of 700MPa grade by online quenching and product thereof |
| CN115558862A (en) * | 2022-10-18 | 2023-01-03 | 包头钢铁（集团）有限责任公司 | L360NX52N steel pipe with wall thickness of 11-16 mm and manufacturing method thereof |
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| WO2014114200A1 (en) * | 2013-01-22 | 2014-07-31 | 中国石油天然气集团公司 | High-steel-grade anti-sulfur drill pipe material and preparation method thereof |
| CN107557664A (en) * | 2017-08-21 | 2018-01-09 | 包头钢铁（集团）有限责任公司 | A kind of anticorrosive Hi-grade steel submarine seamless line pipe and its manufacture method |
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| WO2014114200A1 (en) * | 2013-01-22 | 2014-07-31 | 中国石油天然气集团公司 | High-steel-grade anti-sulfur drill pipe material and preparation method thereof |
| CN107557664A (en) * | 2017-08-21 | 2018-01-09 | 包头钢铁（集团）有限责任公司 | A kind of anticorrosive Hi-grade steel submarine seamless line pipe and its manufacture method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021027188A1 (en) * | 2019-08-14 | 2021-02-18 | 南京钢铁股份有限公司 | Method for producing ultra-low-temperature high-strength acid-resistant container steel by means of casting blank |
| EP4015656A4 (en) * | 2019-08-14 | 2022-12-14 | Nanjing Iron & Steel Co., Ltd. | Method for producing ultra-low-temperature high-strength acid-resistant container steel by means of casting blank |
| CN112853150A (en) * | 2021-01-12 | 2021-05-28 | 鞍钢股份有限公司 | Copper-steel solid-liquid composite bimetallic material for chemical industry and preparation method thereof |
| CN113234988A (en) * | 2021-04-15 | 2021-08-10 | 华南理工大学 | Method for producing weathering steel with yield strength of 700MPa grade by online quenching and product thereof |
| CN115558862A (en) * | 2022-10-18 | 2023-01-03 | 包头钢铁（集团）有限责任公司 | L360NX52N steel pipe with wall thickness of 11-16 mm and manufacturing method thereof |
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Application publication date: 20190625 |