CN108034885A - The low-crackle sensitive steel for pipe fittings plate and its manufacture method used under a kind of cryogenic conditions - Google Patents
The low-crackle sensitive steel for pipe fittings plate and its manufacture method used under a kind of cryogenic conditions Download PDFInfo
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- CN108034885A CN108034885A CN201711097796.7A CN201711097796A CN108034885A CN 108034885 A CN108034885 A CN 108034885A CN 201711097796 A CN201711097796 A CN 201711097796A CN 108034885 A CN108034885 A CN 108034885A
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- 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
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- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
Abstract
The present invention relates to the low-crackle sensitive steel for pipe fittings plate used under a kind of cryogenic conditions, chemical composition (wt%) is C 0.03 0.08, Si 0.2 0.35, Mn 0.9 1.6, Al 0.02 0.04, Nb 0.01 0.07%, V0.01 0.07, Ti0.01 0.02, Nb+V+Ti≤0.15%, Cr≤0.5, Ni≤0.5, Mo≤0.4, Cu≤0.3, Pcm≤0.18；Surplus is Fe and inevitable impurity.The KR molten iron pretreatment-converter smelting-LF refining -450mm thickness continuous casting billet of RH vacuum outgas -370 continuous casting-continuous casting billet covering slow cooling-continuous casting billet inspection cleaning-heating strand-high-pressure water descaling-rolling-cooling-aligning-is tempered offline.Steel plate tissue is in order to control single tempering bainite tissue, grain size in 36 μ ms, steel plate has very excellent low temperature wilful, can meet the requirement of X70 pipe line steels under 60 DEG C of cryogenic conditions.
Description
Technical field
The invention belongs to metallurgical technology field, is related to the low-crackle sensitive steel for pipe fittings plate used under a kind of cryogenic conditions
And manufacture method.
Background technology
In long-distance transport pipes engineering project, to meet that long defeated requirement is set, it is necessary to build many compressor stations, transmission ＆ distribution gas yard etc.
Apply, therefore, it is necessary to substantial amounts of yard steel for pipe fittings.In some severe cold areas, especially similar in the low temperature environments such as Sino-Russian eastern line
The yard pipe fitting used, the limiting temperature of yard is between -30 DEG C to -50 DEG C, it is necessary to have on the basis of conventional pipe steel
Standby more preferable cryogenic property.Meanwhile in whole Fitting-manufacture Process, the cryogenic property shadow of the solderability of material to steel for pipe fittings
Sound is larger, therefore, it is possible to meet that the low-crackle sensitive steel for pipe fittings plate used under cryogenic conditions can better meet engineering need
Will, lift engineering safety.
, it is necessary to by the thermoforming process such as bulge, drawing in pipe fitting production process, bulk heat treatmet is then carried out, because
This, it is necessary to material in the performance requirement for being still able to meet steel for pipe fittings after quenching+tempering.Traditional steel for pipe fittings is usually adopted
With the design of alloy of medium high carbon+raising quenching degree, performance requirement after being heat-treated with guarantee, such as patent announcement CN
102011064 propose a kind of X80 grade low-temps steel for pipe fittings and its preparation and application, and 30-70mm is thick under the conditions of can meeting -46 DEG C
Spend the use of steel for pipe fittings, the scope of C is not belonging to easy weldability steel in 0.12-0.16%, obvious in terms of the solderability of material
It is deteriorated.In manufacturing process, produced frequently with hardening and tempering process.
Patent of the present invention proposes the low-crackle sensitive steel for pipe fittings used under a kind of cryogenic conditions, quick using low crackle
Sensitive ingredients design and hot rolling technology+tempering process production, and the steel for pipe fittings after bulk heat treatmet can be met in -60 DEG C of low temperature bars
Used under part.
The content of the invention
The technical problems to be solved by the invention are low for being used under a kind of cryogenic conditions of above-mentioned prior art offer
Crack sensitivity steel for pipe fittings, is produced using low-crackle sensitive composition design and hot rolling technology+tempering process, can meet entirety
Steel for pipe fittings after heat treatment uses under -60 DEG C of cryogenic conditions, steel plate tissue in order to control for single tempering bainite tissue,
For grain size in 3-6 μ ms, steel plate has very excellent low temperature wilful, can meet X70 pipe line steels under -60 DEG C of cryogenic conditions
Requirement.
Technical solution is used by the present invention solves the above problems：A kind of low-crackle sensitive used under cryogenic conditions
Steel for pipe fittings plate, % is calculated as the chemical composition of the steel plate by mass percentage, C 0.03-0.08, Si 0.2-0.35, Mn 0.9-
1.6, Al 0.02-0.04, Nb+V+Ti≤0.15%, Cr≤0.5, Ni≤0.5, Mo≤0.4, Cu≤0.3, Ti 0.01-
0.02, Pcm≤0.18；Weld crack sensitivity coefficient Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+
5B；Surplus is Fe and inevitable impurity.
The thickness of above-mentioned steel sheet product is 40-60mm, and steel plate meets to use under -60 DEG C of cryogenic conditions, -60 DEG C of lower steel plates 1/
At 4 thickness Charpy-V impact power >=200J.
Present invention design is using low-carbon+Nb, the microalloy element such as V, Ti, C≤0.08%, can obtain lower carbon equivalent and
Cold crack sensitivity coefficient, ensure that steel plate is completely in easy weldability material section, have good solderability；Meanwhile set
Pcm≤0.18, for steel plate there are good welds to provide dual guarantee.
The corresponding principle of chemical composition and its content of steel of the present invention is described as follows：
C：The comprehensive influence for weighing C to quenching degree and weldability, excessive, quenching degree is good, and weldability is poor, too low quenching degree
Difference, intensity is low, weldability is good, considers, and present invention design C content range of choice is 0.03-0.08%.
Si：Deoxidant element, solution strengthening improve the intensity of steel, consider, Si contents range of choice of the present invention is 0.2-
0.35%.
Mn：Low-alloy steel grade basic alloy element, can expand austenite phase temperature range, mainly be improved by solution strengthening
The intensity of steel, can make up the too low caused losss of strength of C；Be influence intensity, quenching degree, the main alloy element of weldability it
One.Consider, the range of choice of Mn contents of the present invention is 0.9-1.6%；
Al：Deoxidant element, can play the role of crystal grain thinning by forming AlN.The range of choice of Al content of the present invention is
0.02-0.04%.
Nb：In During Controlled Rolling, austenite recrystallization area temperature range can be improved, effective fining austenite grains are so as to reach
To the effect of refined crystalline strengthening, be conducive to the raising of intensity and toughness.In quenching+tempering processing procedure, the Nb of solid solution can be formed
NbC is separated out in the form of dispersion-strengtherning, it is possible to increase intensity considers, the selection of Nb contents of the present invention without damaging toughness
Scope is 0.01-0.07%.
V：Carbonitride-forming elements, mainly based on refined crystalline strengthening and precipitation strength, by forming V (C, N) with disperse
Strengthen the mode crystal grain thinning with precipitation strength, improve the intensity and toughness of steel.The range of choice of V content of the present invention is 0.01-
0.07%.
Cr：The essential element of quenching degree is improved, can make up that C content is relatively low to cause intensity and quenching degree to decline not well
Foot.During too high levels, then low-temperature impact toughness and weldability can be adversely affected.Ni、Cu：Steel can be improved by solution strengthening
Intensity, improve low-temperature impact toughness, Cu can also improve the corrosion resistance of material；After adding Cu, steel has hot cracking tendency,
The hot cracking tendency of the steel containing Cu can be improved by adding suitable Ni.Mo：The quenching degree of material can be improved by adding suitable Mo, while can be pushed away
Slow ferritic transformation, also helps steel belt roof bolt brittleness when overcoming modifier treatment.
Ti：Nitrogen killer, 0.02% Ti can fix the N of below 60ppm in steel, and play analysis by forming TiN
Go out reinforcing and the effect of refined crystalline strengthening, effective crystal grain thinning.But excessively easily there is thick precipitated phase in Ti contents, to toughness not
Profit, considers, and the range of choice of Ti contents of the present invention is 0.01-0.02%.
In composition design, low-carbon+micro alloying element is taken, Pcm≤0.18 of giving prominence to the key points, so that material has well
Low-crackle sensitive.
In addition manufacture method that the application provides above-mentioned steel plate is：KR molten iron pretreatment-converter-LF refining-RH vacuum takes off
Offline tempering-essence inspection-performance detection-the storage of gas -370~450mm sheet billet continuous castings-slow cooling-rolling -.
(1) steel making working procedure, is produced using the pretreatment of KR molten iron, 150t converter smeltings, LF refining, RH Fruit storages
High-purity molten steel, then special thick continuous casting billets of continuous casting 370-450mm；Then, covering stacking slow cooling is carried out to continuous casting billet and expands hydrogen
Processing, when stacking slow cooling time >=72 are small.
(2) continuous casting billet is heated to 1100~1220 DEG C, keeps the temperature 160~200min, make the alloying element in steel fully solid
It is molten to ensure the uniformity of performance, remove removing iron scale using high-pressure water descaling after coming out of the stove.
(3) after high-pressure water descaling, carry out two-phase control rolling, the first stage is rough rolling step, start rolling temperature 1000~
1150 DEG C, cumulative review reduction ratio >=50%, rear three passages single pass is averaged reduction ratio >=20%, ensures original austenite grain degree
Fully refinement, overall control is within 25 μm；Second stage is the finish rolling stage, and start rolling temperature is 820~880 DEG C, adds up passage
Reduction ratio >=65%, Unhydrated cement make austenite sufficiently flatization, flat width control system using the big pressure rolling mill practice of low temperature
Within 10-16 μm；Roll rear steel plate and carry out ACC rapid cooling, 300~400 DEG C of leaving water temperature；Continue after water outlet air-cooled；Play 450mm
Thickness continuous casting billet advantage, fully realizes the big pressure of rolling, refines original austenite grain.
(4) offline temperature is 580~680 DEG C, time inside furnace 3.5~4.0min/mm, air-cooled after coming out of the stove.
The present invention uses low-carbon, low crack-sensitivity coefficient for the easy weld-end fittings steel plate used under cryogenic
Composition design, the smelting of high purity steel, the special thick continuous casting steel billet of 370-450mm thickness are as raw material, using controlled rolling plus control
Easy weld-end fittings steel plate more than yield strength 500MPa is produced in cooling, the method being tempered offline, which can
Meet the requirement of X70 level steel for pipe fittings used under -60 DEG C of cryogenic conditions.
The present invention, the advantage given prominence to the key points in composition design, on the basis of the alloying elements such as carbon, Mn are reduced, passes through
Using the microalloy element Proper Match such as Nb, Ti, Ni, the target of low-crackle sensitive is realized, Pcm≤0.18% is, it can be achieved that big
It is not required to preheat under heat input welding condition, ensures the purpose that postwelding heat affected area performance is stablized；On this basis, 370- is played
The rolling advantage of the big thickness continuous casting billet of 450mm thickness, the big pressure of roughing is realized in recrystallization zone, and accumulative percentage pass reduction reaches
More than 50%, rear three passages single pass reduction ratio >=20%, ensure that original austenite grain degree fully refines, overall control is 25
Within μm；Meanwhile in the Unhydrated cement stage, due to the advantage of special thick continuous casting billet, on the premise of the big compression ratio of roughing is met,
It can ensure that the finish rolling stage adds up percentage pass reduction >=65%, the big pressure rolling mill practice of low temperature of Unhydrated cement, makes austenite
Sufficiently flatization, within 10-16 μm, sufficiently flatization can provide more flat width control system for the formation of follow-up bainite
Nucleation site, realizes the crystal grain refinement of bainite, after accelerating cooling, obtains bainite structure, grain size is in 3-6 μm；From
In line temper, dislocation density has declined in bainite, while has tiny Carbide Precipitation, but since crystal grain is abundant
Refinement, tissue is still bainite structure, and intensity has declined, and toughness increases, and is used under the conditions of can meeting -60 DEG C.
Compared with prior art, the advantage of the invention is that：(1) present invention using low-carbon, low-crackle sensitive into setting up separately
Meter, C0.03-0.08%, cold crack sensitivity coefficient Pcm≤0.18；Ensure that steel plate has good easy weldability.(2) it is of the invention
The steel plate provided gives full play to the big thickness continuous casting billet of 370-450mm thickness using controlled rolling and controlled cooling+offline tempering process production
Advantage, improves rolling reduction, abundant fining austenite grains degree, so as to meet to use under -60 DEG C of cryogenic conditions, at -60 DEG C
At 1/4 thickness of steel plate Charpy-V impact power >=200J, there is good low-temperature flexibility.
Brief description of the drawings
Fig. 1 is the microstructure picture of 40mm thickness steel plates of the present invention；
Fig. 2 is the microstructure picture of 60mm thickness steel plates of the present invention.
Embodiment
The present invention is described in further detail with reference to embodiments.
Embodiment 1-2：
Chemical composition ranges according to the present invention and manufacture method, through KR molten iron pretreatment-converter smelting-LF refining-
RH vacuum outgas -370-450mm thickness continuous casting billet continuous casting-continuous casting billet covering slow cooling-continuous casting billet inspection cleaning-strand adds
Heat-high-pressure water descaling-rolling-ACC coolings-air-cooled-aligning-offline tempering process step, manufactures -60 DEG C of cryogenic conditions
The lower low-crackle sensitive steel for pipe fittings plate used.
The concrete technology of above-mentioned heating, rolling and slow cooling stage is：450mm thickness continuous casting billets are heated to 1200 DEG C, insulation
200min (Examples 1 and 2), continuous casting billet use high-pressure water descaling after coming out of the stove；Then two-phase control rolling is carried out, the first stage is thick
Roll, 1080-1150 DEG C of start rolling temperature, add up reduction ratio 73%, last three passage is averaged reduction ratio 23%, workpiece thickness
1080-1150 DEG C of 120mm (embodiment 1) or first stage start rolling temperature, add up reduction ratio 60%, under last three passages mean pressure
Rate 21%, workpiece thickness 180mm (embodiment 2)；Second stage is finish rolling, and start rolling temperature is 830 DEG C, adds up percentage pass reduction
820 DEG C of 66.7% (embodiment 1) or second stage start rolling temperature, add up percentage pass reduction 66.7% (embodiment 2), final steel plate
Thickness is 40mm (embodiment 1) and 60mm (embodiment 2)；Carry out ACC after rolling quickly to cool down, leaving water temperature 370 DEG C (embodiments 1)
With leaving water temperature 330 DEG C (embodiments 2)；It is then air-cooled, offline temper is carried out after air-cooled, temperature is 620 DEG C, tempering
It is 660 DEG C to keep the temperature 140min (embodiment 1) and temperature, tempering insulation 210min (embodiment 2).
The mechanical property of experiment steel plate is shown in Table 2, and the microscopic structure of steel plate as depicted in figs. 1 and 2, is organized as homogeneous tempering
Bainite structure, grain size are in 3-6 μ ms.
The chemical composition (wt.%) of pipe fitting steel plate in 1 Examples 1 and 2 of table
| Example | C | Si | Mn | P | S | Al | Nb+Ti+V | Pcm | Ceq |
| 1 | 0.06 | 0.25 | 1.50 | 0.008 | 0.0006 | 0.023 | 0.10 | 0.17 | 0.418 |
| 2 | 0.07 | 0.24 | 1.53 | 0.007 | 0.0005 | 0.025 | 0.12 | 0.18 | 0.422 |
Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15
Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B
The mechanical property of pipe fitting steel plate in 2 Examples 1 and 2 of table
In addition to the implementation, it is all to use equivalent transformation or equivalent replacement present invention additionally comprises there is other embodiment
The technical solution that mode is formed, should all fall within the scope of the hereto appended claims.
Claims (4)
- A kind of 1. low-crackle sensitive steel for pipe fittings plate used under cryogenic conditions, it is characterised in that：The chemical composition of the steel plate % is calculated as by mass percentage, C 0.03-0.08, Si 0.2-0.35, Mn 0.9-1.6, Al 0.02-0.04, Nb 0.01- 0.07%, V0.01-0.07, Ti 0.01-0.02, Nb+V+Ti≤0.15%, Cr≤0.5, Ni≤0.5, Mo≤0.4, Cu≤ 0.3, Pcm≤0.18；Weld crack sensitivity coefficient Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B； Surplus is Fe and inevitable impurity.
- 2. the low-crackle sensitive steel for pipe fittings plate used under cryogenic conditions according to claim 1, it is characterised in that：Steel The thickness of plate is 40-60mm, and steel plate meets to use under -60 DEG C of cryogenic conditions, Charpy-V impact power at -60 DEG C of 1/4 thickness of lower steel plate >=200J, meets the requirement of X70 grades of steel for pipe fittings.
- A kind of 3. manufacture method of the low-crackle sensitive steel for pipe fittings plate used under cryogenic conditions, it is characterised in that：Produce work Skill flow is KR molten iron pretreatment-converter smelting-LF refining-RH vacuum outgas -370-450mm thickness continuous casting billets continuous casting - Continuous casting billet covering slow cooling-continuous casting billet inspection cleaning-heating strand-high-pressure water descaling-rolling-cooling-aligning-is offline Tempering,Key step concrete operations are as follows：(1) steel making working procedure, is produced high-purity using the pretreatment of KR molten iron, 150t converter smeltings, LF refining, RH Fruit storages Net molten steel, then special thick continuous casting billets of continuous casting 370-450mm；Then, covering stacking slow cooling is carried out to continuous casting billet and expands hydrogen processing, When stacking slow cooling time >=72 are small；(2) continuous casting billet is heated to 1100~1220 DEG C, keeps the temperature 160~200min, the alloying element in steel is fully dissolved with Ensure the uniformity of performance, removing iron scale is removed using high-pressure water descaling after coming out of the stove；(3) after high-pressure water descaling, two-phase control rolling is carried out, the first stage is rough rolling step, and start rolling temperature is 1000~1150 DEG C, cumulative review reduction ratio >=50%, rear three passages single pass is averaged reduction ratio >=20%, ensures that original austenite grain degree is abundant Refinement, overall control is within 25 μm；Second stage is the finish rolling stage, and start rolling temperature is 820~880 DEG C, adds up passage pressure Rate >=65%, Unhydrated cement make austenite sufficiently flatization using the big pressure rolling mill practice of low temperature, and flat width control system is in 10- Within 16 μm；Roll rear steel plate and carry out ACC rapid cooling, 300~400 DEG C of leaving water temperature；Continue after water outlet air-cooled；Play 450mm thickness Continuous casting billet advantage, fully realizes the big pressure of rolling, refines original austenite grain；(4) offline temperature is 580~680 DEG C, time inside furnace 3.5~4.0min/mm, air-cooled after coming out of the stove.
- 4. the manufacture method of the low-crackle sensitive steel for pipe fittings plate used under cryogenic conditions according to claim 3, its It is characterized in that：% is calculated as steel plate chemical composition by mass percentage, C 0.03-0.08, Si 0.2-0.35, Mn 0.9-1.6, Al 0.02-0.04, Nb+V+Ti≤0.15%, Cr≤0.5, Ni≤0.5, Mo≤0.4, Cu≤0.3, Ti 0.01-0.02, Pcm≤ 0.18；Weld crack sensitivity coefficient Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B；Surplus is Fe And inevitable impurity.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008069289A1 (en) * | 2006-11-30 | 2008-06-12 | Nippon Steel Corporation | Weld steel pipe with excellent low-temperature toughness for high-strength line pipe and process for producing the same |
| CN101643888A (en) * | 2009-08-31 | 2010-02-10 | 武汉钢铁(集团)公司 | Low welding crack sensitivity steel with tensile strength at 700MPa level and production method thereof |
| US20110023991A1 (en) * | 2008-04-07 | 2011-02-03 | Taishi Fujishiro | High strength steel plate, steel pipe with excellent low temperature toughness, and method of production of same |
| CN102732797A (en) * | 2012-06-14 | 2012-10-17 | 莱芜钢铁集团有限公司 | 800MPa grade low welding crack sensitivity steel plate and its manufacturing method |
| CN105755369A (en) * | 2016-04-28 | 2016-07-13 | 江阴兴澄特种钢铁有限公司 | Easy-to-weld and low-temperature steel plate with excellent lamellar tearing resistance and manufacturing method thereof |
| CN105803325A (en) * | 2016-04-28 | 2016-07-27 | 江阴兴澄特种钢铁有限公司 | Low-crack-sensitivity and low-yield strength-ratio ultra-thick steel plate and production method thereof |
| CN106567011A (en) * | 2016-11-09 | 2017-04-19 | 江阴兴澄特种钢铁有限公司 | Easy-to-weld ultra-thick steel plate with high strength and high toughness suitable for minus 60 DEG C and manufacturing method thereof |
-
2017
- 2017-11-09 CN CN201711097796.7A patent/CN108034885B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008069289A1 (en) * | 2006-11-30 | 2008-06-12 | Nippon Steel Corporation | Weld steel pipe with excellent low-temperature toughness for high-strength line pipe and process for producing the same |
| US20110023991A1 (en) * | 2008-04-07 | 2011-02-03 | Taishi Fujishiro | High strength steel plate, steel pipe with excellent low temperature toughness, and method of production of same |
| CN101643888A (en) * | 2009-08-31 | 2010-02-10 | 武汉钢铁(集团)公司 | Low welding crack sensitivity steel with tensile strength at 700MPa level and production method thereof |
| CN102732797A (en) * | 2012-06-14 | 2012-10-17 | 莱芜钢铁集团有限公司 | 800MPa grade low welding crack sensitivity steel plate and its manufacturing method |
| CN105755369A (en) * | 2016-04-28 | 2016-07-13 | 江阴兴澄特种钢铁有限公司 | Easy-to-weld and low-temperature steel plate with excellent lamellar tearing resistance and manufacturing method thereof |
| CN105803325A (en) * | 2016-04-28 | 2016-07-27 | 江阴兴澄特种钢铁有限公司 | Low-crack-sensitivity and low-yield strength-ratio ultra-thick steel plate and production method thereof |
| CN106567011A (en) * | 2016-11-09 | 2017-04-19 | 江阴兴澄特种钢铁有限公司 | Easy-to-weld ultra-thick steel plate with high strength and high toughness suitable for minus 60 DEG C and manufacturing method thereof |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110184530A (en) * | 2018-07-14 | 2019-08-30 | 江阴兴澄特种钢铁有限公司 | The pipe fitting used under low temperature and acid condition normalizing state steel plate and its manufacturing method |
| CN110184530B (en) * | 2018-07-14 | 2021-06-01 | 江阴兴澄特种钢铁有限公司 | Normalized steel sheet for pipe used under low temperature and acidic conditions and method for producing same |
| CN109022708A (en) * | 2018-09-19 | 2018-12-18 | 江阴兴澄特种钢铁有限公司 | The low-carbon used under a kind of condition of ultralow temperature easily welds normalizing acid-resistant pipeline steel plate |
| CN109762976A (en) * | 2018-12-29 | 2019-05-17 | 江阴兴澄特种钢铁有限公司 | A kind of efficient pipe line steel production method for obtaining low yield strength ratio performance |
| CN110669990B (en) * | 2019-09-30 | 2021-02-23 | 鞍钢股份有限公司 | High-performance chromium-molybdenum steel plate and production method thereof |
| CN110669990A (en) * | 2019-09-30 | 2020-01-10 | 鞍钢股份有限公司 | High-performance chromium-molybdenum steel plate and production method thereof |
| CN111139402A (en) * | 2019-12-27 | 2020-05-12 | 山东钢铁集团日照有限公司 | Economical low-temperature structural steel plate for polar region and manufacturing method thereof |
| CN111690801A (en) * | 2020-05-25 | 2020-09-22 | 中天钢铁集团有限公司 | Production process of alloy tool steel wire rod for obtaining full bainite structure |
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| CN112226699A (en) * | 2020-10-28 | 2021-01-15 | 湖南华菱湘潭钢铁有限公司 | Production method of acid-resistant pipeline steel |
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| CN113817963A (en) * | 2021-08-26 | 2021-12-21 | 包头钢铁（集团）有限责任公司 | 1000 MPa-level low-welding-crack-sensitivity steel plate and production method thereof |
| CN114807751A (en) * | 2022-04-12 | 2022-07-29 | 江阴兴澄特种钢铁有限公司 | A516Gr.70(HIC) acid-resistant pipe steel with excellent die welding and low-temperature performance and manufacturing method thereof |
| CN114807751B (en) * | 2022-04-12 | 2023-10-24 | 江阴兴澄特种钢铁有限公司 | A516Gr.70 (HIC) acid-resistant pipe steel with excellent die-welding and low-temperature performances and manufacturing method thereof |
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