CN109022708A - The low-carbon used under a kind of condition of ultralow temperature easily welds normalizing acid-resistant pipeline steel plate - Google Patents

The low-carbon used under a kind of condition of ultralow temperature easily welds normalizing acid-resistant pipeline steel plate Download PDF

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CN109022708A
CN109022708A CN201811092869.8A CN201811092869A CN109022708A CN 109022708 A CN109022708 A CN 109022708A CN 201811092869 A CN201811092869 A CN 201811092869A CN 109022708 A CN109022708 A CN 109022708A
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normalizing
steel plate
low
used under
temperature
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石艾来
许晓红
白云
苗丕峰
林涛
孙宪进
许峰
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Jiangyin Xingcheng Special Steel Works Co Ltd
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Jiangyin Xingcheng Special Steel Works Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • 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
    • C21D2211/009—Pearlite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses the low-carbons used under a kind of condition of ultralow temperature easily to weld normalizing acid-resistant pipeline steel plate, and steel plate is basic element with Fe, and % includes C 0.04~0.06 to chemical component by mass percentage；Si 0.20~0.40；Mn 1.1~1.4；Al 0.02~0.04；Nb 0.03~0.05；V≤0.04；Cr 0.1~0.3；Ni 0.1~0.2；Mo≤0.3；Cu 0.1~0.3；Ti 0.01~0.02 and inevitable impurity element；Weld crack sensitivity coefficient Pcm≤0.17, steel plate are the delivery of normalizing state, have ferritic-pearlitic tissue, grain size >=8 grade.Production procedure is KR molten iron pretreatment-converter--150~370mm of LF refining-RH vacuum outgas sheet billet continuous casting-offline normalizing of slow cooling-rolling -.The application is using the compound adding ingredient design of low-carbon+microalloy, the compound addition for microalloy ingredient of giving prominence to the key points, so that material be made to have good low-temperature flexibility and hic resistance, SSCC ability after normalizing.

Description

The low-carbon used under a kind of condition of ultralow temperature easily welds normalizing acid-resistant pipeline steel plate
Technical field
The invention belongs to metallurgical technology fields, and in particular to the normalizing used under one kind 6~25mm thickness condition of ultralow temperature Acid-resistant pipeline steel plate.The steel plate is designed using low-carbon, has preferable welding performance.
Background technique
Pipeline transportation petroleum, natural gas are one of most economical, most convenient, most important means of transportation, to meet pipeline fortune Defeated requirement needs a large amount of pipeline steel, the pipe line steel for more especially having particular surroundings to require.In some severe cold areas, week The limiting temperature in collarette border will convey between~30 DEG C to~65 DEG C containing H2S gas pipeline be (world about 1/3 Contain H in oil gas field2S gas, such as: all contain H in the oil-gas Layer on the ground such as the Russia in Xinjiang, northeast and foreign countries2S gas, he Be all serious corrosion in the world oil gas field), need to have better low temperature properties on the basis of conventional pipeline steel Energy and Antacid effectiveness.Meanwhile for such steel pipe in entire manufacturing process, materials microstructure uniformity, especially postwelding are whole The even tissue of a steel pipe is also especially important, therefore, the normalizing state acid-resistant pipeline steel used under a kind of ultralow temperature and acid condition Plate can satisfy requirement of engineering, improve the service safety of oil gas pipeline, economic damage caused by reducing because of low temperature and corrosion It loses.
Pipeline Steel Plate be usually with hot rolling perhaps TMCP state delivery this kind of steel plate be likely to occur nonuniform organization or The defects of non-normal tissue, so as to cause performance inconsistency.Bigger, institute especially is influenced on ultralow temperature performance and acid-resistant pipeline steel To eliminate this kind of defect using normalizing.
The antiacid pipeline steel of Conventional cryogenic normalizing generallys useMedium high carbon+raising Antacid effectiveness alloying componentDesign, with Guarantee performance requirements after being heat-treated, as patent announcement CN 105821335 proposes a kind of low cost of excellent weldability Ultralow temperature normalizing type pipe line steel and its production method, the use of 6~25.4mm thickness pipeline steel under the conditions of~51 DEG C can be met, The range of C is 0.06~0.09%, and such steel is not available when limiting temperature is lower than~51 DEG C, while in the solderability of material Aspect is obviously deteriorated.
For normalizing acid-resistant pipeline steel plate, its low-temperature flexibility and easy weldability are developed, allows to fit at lower temperatures Further exploration is made with worth existing technical staff.
Summary of the invention
Present applicant proposes the normalizing acid-resistant pipeline steel plate used under one kind 6~25mm thickness condition of ultralow temperature and its manufactures Method is produced using ultralow temperature and antacid composition design+TMCP hot rolling technology+normalizing process, after can meeting bulk heat treatmet Pipeline uses under -80 DEG C of cryogenic conditions, while also having easy weldability.
The specific technical solution of the application is, the low-carbon used under a kind of condition of ultralow temperature easily welds normalizing acid-resistant pipeline steel Plate, steel plate are basic element with Fe, chemical component % by mass percentage further include: C 0.04~0.06；Si 0.20~ 0.40；Mn 1.1~1.4；Al 0.02~0.04；Nb 0.03~0.05；V≤0.04；Cr 0.1~0.3；Ni 0.1~0.2； Mo≤0.3；Cu 0.1~0.3；Ti 0.01~0.02 and inevitable impurity element；Weld crack sensitivity coefficient Pcm= C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B, Pcm≤0.17, steel plate are the delivery of normalizing state, are organized as iron Ferritic+pearlitic structrure, grain size >=8.
Product with a thickness of 6-25mm.In ingredient design, the compound adding ingredient design of low-carbon+microalloy is taken, emphasis is prominent The compound addition of microalloy ingredient out, to make material that there is good low-temperature flexibility and hic resistance, SSCC ability after normalizing.
The effect of key component contained in the present invention and its content installation warrants are as follows:
C: carbon is intensified element most economical, most basic in steel, can significantly improve steel by solution strengthening and precipitation strength Intensity, but toughness to steel and welding performance bring adverse effect, comprehensively consider, C content range of choice of the present invention is 0.04~0.06%.
Si: being added Si in steel, can improve intensity, elastic limit and harden ability, but Si makes in steel with reinforced ferrite Superheated susceptivity, crackle tendency increase.Comprehensively consider, the range of Si content of the present invention is determined as 0.2~0.4%.
Mn: low-alloy steel grade basic alloy element can expand austenite phase temperature range, improve steel by solution strengthening Intensity is that the most important element for causing loss of strength because of C content reduction is made up in pipeline steel, and Mn still expands γ simultaneously The element of phase region can reduce γ → α phase transition temperature of steel, help to obtain tiny phase-change product, and the toughness of steel can be improved, drop Low tough brittle transition temperature, Mn are also the harden ability element for improving steel.In view of finding Mn segregation to acid-resisting in checkout procedure Can have an adverse effect, combine intensity requirement, the design of Mn content is in 1.1~1.4% ranges in the present invention.
Al: deoxidant element can play the role of refining crystal grain by forming AlN.The range of choice of Al content of the present invention is 0.02~0.04%.
Nb: being one of most important micro alloying element in modern micro alloyed steel especially low-alloy steel, thin to crystal grain The effect of change is clearly.During normalized treatment, the Nb of solid solution will form NbC and is precipitated in the form of dispersion-strengtherning, can Intensity is improved without damaging toughness, is comprehensively considered, the range of choice of Nb content of the present invention is 0.03~0.05%.
Cr, Ni, Cu:Cr can improve the inoxidizability and corrosion resistance of steel, and Cr can form fine and close oxidation in steel surface Film, improves the passivation ability of steel, but reduces low-temperature impact toughness simultaneously；Ni has higher corrosion resistance to soda acid, but compares It is more rare, price；Cu can improve atmospheric corrosion resistance ability, can improve the corrosion resistance of material, but after addition Cu, steel has Hot-short tendency, suitable Ni, which is added, can improve the hot-short tendency containing Cu.Comprehensively consider, the present invention adds using Cr, Ni, Cu are compound Add, the range of total content is determined as 0.30~0.80%.
Ti: nitrogen killer, 0.02% Ti can fix 60ppm N below in steel, and play analysis by forming TiN Strengthen the effect with refined crystalline strengthening, effectively refinement crystal grain out.But Ti content is excessively easy to appear coarse precipitated phase, not to toughness Benefit comprehensively considers, and the range of choice of Ti content of the present invention is 0.01~0.02%.
The production procedure of the application steel plate are as follows: KR molten iron pretreatment-converter-LF refining-RH vacuum outgas-slab connects Casting-slow cooling-rolling-normalizing-essence inspection-performance detection-is packed and stored.Specific step is as follows
(1) steel making working procedure is produced using the pretreatment of KR molten iron, 150t converter smelting, LF refining, RH Fruit storage Then high-purity molten steel produces the continuous casting billet of 150~370mm thickness, carry out covering stacking slow cooling to continuous casting billet and make to expand hydrogen processing, Stacking slow cooling time >=72 hour；
(2) continuous casting billet is heated to 1050~1190 DEG C, keeps the temperature 100~180min, soaking zone soaking time >=30min, The alloying element in steel is set sufficiently to be dissolved the uniformity to guarantee performance, continuous casting billet uses 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 roughing, and start rolling temperature is in 1000-1050 DEG C, cumulative review reduction ratio >=50%, rear three passages single pass is averaged reduction ratio >=20%；Second stage is the finish rolling stage, is opened Rolling temperature is 850-950 DEG C, adds up percentage pass reduction >=55%；Roll rear steel plate and carry out ACC rapid cooling, cooling rate control 3~8 DEG C/ S, 560~680 DEG C of leaving water temperature；Thermal straightening is carried out after water outlet, it is then air-cooled；
(4) offline normalizing: normalizing temperature is 880~910 DEG C, 2.0~3.5min/mm of time inside furnace, most short time inside furnace It is >=60 minutes, air-cooled after coming out of the stove.Normalizing temperature is set as AC3Above 30-60 DEG C of temperature, guarantees steel plate complete austenitizing, pass through Normalizing improves the uniformity of slab in a thickness direction, eliminates the structural stress for rolling the generation of plate process, facilitates improper The elimination of tissue defects.The specific tissue of steel plate is the ferrite and pearlite more refined, grain size >=8 grade, table after normalizing Reveal excellent low-temperature flexibility.
Compared with prior art, the application has the advantage that:
(1) present invention is using low-carbon, the ingredient design of the compound addition of microalloy, and C content is 0.04~0.06%, and crackle is quick Feel FACTOR P cm≤0.17, it is ensured that under the premise of armor plate strength, there is excellent easy welding performance, wherein using Ultra-low carbon at The design for dividing+TMCP technique, can significantly improve the low-temperature impact toughness of steel plate.
(2) steel plate provided by the present invention is produced using controlled rolling and controlled cooling+offline normalizing process, and product can satisfy -80 DEG C Used under cryogenic conditions, at 1/2 thickness of -80 DEG C of lower steel plates Charpy-V impact power >=120J, have good low-temperature impact it is tough Property.
(3) excellent Antacid effectiveness: HIC performance meets: using solution A, crack-sensitivity rate (CSR)≤0.5%, crackle are long Degree rate (CLR)≤5.0%, crack thickness rate (CTR) are≤2%；SSCC performance detection: without any crackle.
Detailed description of the invention
Fig. 1 is the microstructure picture of 1 steel sheet product of the embodiment of the present invention；
Fig. 2 is the microstructure picture of 2 steel sheet product of the embodiment of the present invention.
Specific embodiment
Present invention is further described in detail with reference to embodiments.
Examples 1 to 2:
The present invention relates to the low-carbons used under condition of ultralow temperature easily to weld normalizing acid-resistant pipeline steel, through KR molten iron pretreatment- Converter smelting-LF refining-vacuum outgas -150 RH~370mm thickness continuous casting billet continuous casting-continuous casting billet covering slow cooling-continuous casting Base inspection cleaning-slab heating-high-pressure water descaling-rolling-cooling-aligning-steel plate covering heap retarded cooling process step, system Make the ultralow temperature used under -80 DEG C of cryogenic conditions and antiacid pipeline steel.
Above-mentioned heating, rolling and normalizing stage specifically comprises the processes of: above-mentioned heating, rolling, cooling, the normalizing stage it is specific Technique are as follows: 150mm thickness continuous casting billet is heated to 1180 DEG C, soaking zone keeps the temperature 30min (embodiment 1) or 150mm thickness continuous casting Base is heated to 1190 DEG C, and soaking zone keeps the temperature 45min (embodiment 2), and continuous casting billet uses high-pressure water descaling after coming out of the stove；Then two are carried out Stage rolling, 1000-1050 DEG C of first stage start rolling temperature, cumulative review reduction ratio >=58.5%, workpiece thickness 22.5mm (embodiment 1) or 1000-1050 DEG C of first stage start rolling temperature, cumulative review reduction ratio >=56.9%, workpiece thickness 85.6mm (embodiment 2)；Second stage start rolling temperature is 930 DEG C, adds up percentage pass reduction 62.5% (embodiment 1) or second-order Section 870 DEG C of start rolling temperature, add up percentage pass reduction 68.5% (embodiment 2), final steel plate thickness be 7.2mm (embodiment 1) and 24.8mm (embodiment 2)；It is rapidly cooled after rolling, 6 DEG C/s of cooling rate, 650 DEG C of leaving water temperature (embodiment 1) and 8 DEG C/s of cooling rate, 580 DEG C of leaving water temperature (embodiment 2)；Then thermal straightening；Steel plate carries out air-cooled after thermal straightening, carries out at offline normalizing after air-cooled Reason, normalizing temperature are 900 DEG C, and normalizing keeps the temperature 60min (embodiment 1) and normalizing temperature is 910 DEG C, and normalizing keeps the temperature 85min and (implements Example 2).
The steel plate chemical component that Examples 1 and 2 are related to is shown in Table 1, and the mechanical property of steel plate is shown in Table 2, the Properties of HIC resistance of steel plate 3 are shown in Table, it is highly uniform tiny for clearly indicating tissue in the microscopic structure (grab sample) of 1 steel plate of embodiment such as Fig. 1, Fig. 1 Ferritic-pearlitic tissue.
The chemical component (wt.%) of 1 Examples 1 and 2 pipeline steel of table
Example C Si Mn P S Al Nb Ti V Cr+Ni+Cu Pcm
1 0.06 0.35 1.36 0.007 0.0008 0.035 0.038 0.015 0.006 0.55 0.163
2 0.06 0.35 1.35 0.008 0.0006 0.032 0.041 0.016 0.008 0.56 0.165
Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B
The mechanical property of 2 Examples 1 and 2 pipeline steel of table
Example Thickness/mm Yield strength/MPa Tensile strength/MPa - 80 DEG C of ballistic work/J
1 7.2mm 439 515 178,149,188
2 24.8mm 432 512 198,202,189
The Antacid effectiveness of pipeline steel in 3 Examples 1 and 2 of table
In addition to the implementation, all to use equivalent transformation or equivalent replacement the invention also includes there is an other embodiments The technical solution that mode is formed should all be fallen within the scope of the hereto appended claims.

Claims (5)

1. the low-carbon used under a kind of condition of ultralow temperature easily welds normalizing acid-resistant pipeline steel plate, it is characterised in that: steel plate is with Fe Infrastructure elements, chemical component % by mass percentage further include: C 0.04~0.06；Si 0.20~0.40；Mn 1.1~1.4； Al 0.02~0.04；Nb 0.03~0.05；V≤0.04；Cr 0.1~0.3；Ni 0.1~0.2；Mo≤0.3；Cu 0.1~ 0.3；Ti 0.01~0.02 and inevitable impurity element；Weld crack sensitivity coefficient Pcm=C+Si/30+ (Mn+Cu+ Cr)/20+Ni/60+Mo/15+V/10+5B, Pcm≤0.17, steel plate are the delivery of normalizing state, have ferritic-pearlitic tissue, brilliant Granularity >=8 grade.
2. the low-carbon used under condition of ultralow temperature according to claim 1 easily welds normalizing acid-resistant pipeline steel plate, feature Be: product with a thickness of 6-25mm, yield strength is >=420MPa, and tensile strength is >=480MPa, -80 DEG C of Charpy-V impact powers ≥120J；Properties of HIC resistance meet: use solution A, crack-sensitivity rate (CSR)≤0.5%, crack length rate (CLR)≤5.0%, Crack thickness rate (CTR) is≤2%；SSCC is detected without any crackle.
3. the preparation method that the low-carbon used under a kind of condition of ultralow temperature easily welds normalizing acid-resistant pipeline steel plate, it is characterised in that: KR molten iron pretreatment-converter--150~370mm of the LF refining-RH vacuum outgas sheet billet continuous casting-offline normalizing of slow cooling-rolling -.
4. the preparation side that the low-carbon used under condition of ultralow temperature according to claim 3 easily welds normalizing acid-resistant pipeline steel plate Method, it is characterised in that:
(1) steel making working procedure is produced high-purity using the pretreatment of KR molten iron, 150t converter smelting, LF refining, RH Fruit storage Then net molten steel produces the continuous casting billet of 150~370mm thickness, carry out covering stacking slow cooling to continuous casting billet and make to expand hydrogen processing, stacking Slow cooling time >=72 hour；
(2) continuous casting billet is heated to 1050~1190 DEG C, keeps the temperature 100~180min, soaking zone soaking time >=30min makes steel In alloying element be sufficiently dissolved the uniformity to guarantee performance, continuous casting billet uses 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 roughing, and start rolling temperature tires out at 1000-1050 DEG C Count comprehensive reduction ratio >=50%, rear three passages single pass is averaged reduction ratio >=20%；Second stage is finish rolling stage, start rolling temperature It is 850-950 DEG C, adds up percentage pass reduction >=55%；It rolls rear steel plate and carries out ACC rapid cooling, cooling rate control is in 3~8 DEG C/s, water outlet 560~680 DEG C of temperature；Thermal straightening is carried out after water outlet, it is then air-cooled；
(4) offline normalizing: normalizing temperature is 880~910 DEG C, 2.0~3.5min/mm of time inside furnace, most short time inside furnace >=60 Minute, it is air-cooled after coming out of the stove.
5. the system that the low-carbon used under condition of ultralow temperature according to claim 3 or 4 easily welds normalizing acid-resistant pipeline steel plate Preparation Method, it is characterised in that: the ingredient of molten steel % by mass percentage further include: C 0.04~0.06；Si 0.20~0.40； Mn 1.1~1.4；Al 0.02~0.04；Nb 0.03~0.05；V≤0.04；Cr 0.1~0.3；Ni 0.1~0.2；Mo≤ 0.3；Cu 0.1~0.3；Ti 0.01~0.02 and inevitable impurity element.
CN201811092869.8A 2018-09-19 2018-09-19 The low-carbon used under a kind of condition of ultralow temperature easily welds normalizing acid-resistant pipeline steel plate Pending CN109022708A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110317996A (en) * 2019-06-21 2019-10-11 江阴兴澄特种钢铁有限公司 The steel plate and manufacturing method of A516Gr.65 (HIC) the pipe fitting normalizing state used under a kind of ultralow temperature and acid service condition
CN112593149A (en) * 2020-11-26 2021-04-02 江苏联峰能源装备有限公司 Production process for controlling surface cracks of microalloyed hot-rolled round steel

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CN102703807A (en) * 2012-06-25 2012-10-03 武汉钢铁(集团)公司 Steel with minus 80-degree C impact absorbing energy no less than 100J for ocean engineering and production method thereof
CN104831182A (en) * 2015-04-02 2015-08-12 江阴兴澄特种钢铁有限公司 Low yield-to-strength ratio anti-HIC and anti-SSCCX70 pipeline steel plate and making method thereof
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