CN107287506A - A kind of 650MPa grades of medium temperature and medium pressure boiler plate and its production method - Google Patents

A kind of 650MPa grades of medium temperature and medium pressure boiler plate and its production method Download PDF

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CN107287506A
CN107287506A CN201610200259.XA CN201610200259A CN107287506A CN 107287506 A CN107287506 A CN 107287506A CN 201610200259 A CN201610200259 A CN 201610200259A CN 107287506 A CN107287506 A CN 107287506A
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temperature
steel
stage
rolling
medium
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CN107287506B (en
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王储
原思宇
胡昕明
王长顺
艾芳芳
王勇
欧阳鑫
韩旭
李黎明
石峰涛
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Angang Steel 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing 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
    • C21D2211/002—Bainite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite

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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 present invention discloses chemical composition in a kind of 650MPa grades of medium temperature and medium pressure boiler plate and its production method, steel and is by weight percentage：C 0.15%~0.23%, Si 0.15%~0.40%, Mn1.20%~1.60%, S≤0.005%, P≤0.015%, Ni 0.20%~0.40%, Mo0.30%~0.60%, Ti 0.01%~0.02%, V 0.02%~0.05%, Als 0.02%~0.05%, surplus are Fe and inevitable impurity.Rolling uses two benches normalizing rolling technique, I the stage start rolling temperature >=1100 DEG C, 1050~1000 DEG C of finishing temperature, I stage percentage pass reduction 15%~25%, workpiece thickness be 2~2.5 times of finished steel plate；II 900~920 DEG C of stage start rolling temperature, 870~890 DEG C of finishing temperature, II stage accumulative reduction ratio are 50%~65%, roll rear air cooling.It is tempered 650~680 DEG C of holding temperature, 2~4min/mm of soaking time.

Description

A kind of 650MPa grades of medium temperature and medium pressure boiler plate and its production method
Technical field
The invention belongs to metallurgy industry, it is related to a kind of for middle temperature, the boiler pressure in middle pressure ring border Vessel Steels and its production method.
Background technology
Boiler is a kind of energy conversion, and the energy inputted to boiler has the chemistry in fuel The forms such as energy, electric energy, the heat energy of high-temperature flue gas, and pass through boiler conversion, outwards output has Steam, high-temperature water or the organic heat carrier of certain heat energy, for a long time in the national economic development Very important effect is played, is used for the fields such as thermal power station, ship, locomotive and industrial and mineral.In Middle benefit gas pressure boiler vessel refers mainly to use environment in 3.8MPa ＜ pressure ＜ 5.8MPa, 350 DEG C of ＜ 450 DEG C of temperature ＜ boiler vessel facility, due to manufacturing the raw material main steel of boiler vessel, Therefore iron and steel enterprise attaches great importance to for the exploitation of boiler vessel steel plate.
Invention disclosed patent " one kind for vanadium titanium Combined Processing boiler and steels for pressure vessel use and its Production method " (201010622957.1), the intensity of steel is improved by vanadium titanium Combined Processing, But disclosed boiler and steels for pressure vessel use belong to the relatively low trade mark of intensity in boiler vessel.
Invention disclosed patent " a kind of big thickness boiler drum low-alloy high-strength steel plate and its system Make method " (CN103834873A), the alloy member such as addition Cr, Ni, Mo, Nb on composition Element, ensures the items of steel plate by traditional static ingot+rolling+heat-treated offline technique Can, complex process is cumbersome.
Patent of invention " a kind of pressure vessel steel 18MnMoNbR and its life of 100mm thick plates Production. art " (CN103160740A) and《Metal material and metallurgical engineering》In deliver Paper " development of the special thickness 18MnMoNbR steel grades of pressure vessel ", the production of open steel grade Technological process is essentially electric furnace+molding+rolling+heat treatment, and although Composition And Process meets steel plate It can require, but equally exist the problems such as manufacturing process is complicated, the production cycle is long.
More precious metal element is with the addition of in the composition design that patent of invention disclosed above has Although add cost, have be not added with more alloying element but intensity rank is relatively low；In technique Mostly using static ingot as raw material, low production efficiency, cost is higher, and Technology for Heating Processing Substantially offline normalizing+tempering is used, process cost is further increased.In order to solve above-mentioned public affairs Problems present in patent are opened, the invention is intended to set using a kind of rational chemical composition Meter, i.e., it is appropriate to improve carbon content, addition Ni, Mo alloying element and V, Ti microalloy element, Strengthen the normal temperature and medium temperature intensity of steel, pass through revolving furnace continuous casting, online normalizing rolling+offline tempering Production process route, effectively reduces production process cost, it is ensured that the rank boiler plate it is normal Warm and middle warm nature energy.
The content of the invention
It is of the invention by brand-new Design of Chemical Composition for the deficiencies in the prior art, Using the production process route different from conventional boiler container fabrication process, toughening type matching is obtained The boiler plate of excellent, middle temperature function admirable.
The technical scheme is that：The design of alloy of steel, by weight percentage for：C 0.15%~0.23%, Si 0.15%~0.40%, Mn 1.20%~1.60%, S≤0.005%, P ≤ 0.015%, Ni 0.20%~0.40%, Mo 0.30%~0.60%, Ti 0.01%~0.02%, V 0.02%~0.05%, Als 0.02%~0.05%, surplus is Fe and is unavoidably mingled with；
Alloying element C, Si, Mn, P, S, Ni, Mo, Ti, V, Als are limited in steel plate The reasons why amount, details are as follows：
C is the main element for improving hardness of steel, and steel is improved by solution strengthening and precipitation strength Intensity, improve quenching degree, and ensure steel intensity rank and high-temperature behavior；Carbon content is too high, The welding performance of steel can be influenceed again.Therefore C content is defined to 0.15% in the present invention~ 0.23%.
Si is as reducing agent and deoxidier in steelmaking process, and Si and Mo, Cr etc. are combined, had Corrosion resistance and oxidation resistant effect are improved, during more than 0.5%, the toughness of steel can be caused to decline, The welding performance of steel is reduced, therefore Si contents are defined to 0.15%~0.40% in the present invention.
Mn can increase the toughness, intensity and hardness of steel, be the element of strong stable austenite, The decomposition rate of austenite can be effectively reduced, the quenching degree of steel, Mn contents Gao Huizeng is improved Strong temper brittleness, therefore control Mn content ranges to be 1.20%~1.60%.
S and P are harmful elements in steel, increase steel fragility, therefore should try one's best reduction phosphorus with S, P content are defined to respectively in content of the sulphur in steel, the present invention：S≤0.005%, P≤0.015%.
Mo improves the quenching degree of steel, during content 0.5% or so, can reduce temper brittleness, there is two Underhardening is acted on.Heat resistance and creep strength are improved, but Mo too high levels can cause steel on the contrary Embrittlement, therefore Mo contents are limited to 0.30%~0.60% in the present invention.
Ni can improve the intensity of steel plate, toughness, and with good quenching degree, improve plasticity And toughness, improve corrosion resisting property, be used in combination with molybdenum, strengthen heat resistance, be refractory steel and not Become rusty one of main alloy element of acid resisting steel, but because Ni costs are higher, therefore by Ni contents It is limited to 0.20%~0.40%
Ti solution strengthening effects are strong, but the toughness of reduction solid solution, are solid-solution in austenite and improve The quenching degree of steel, improves temper resistance, and has post-curing effect, improves the anti-oxidant of steel Property and heat resistance, such as creep and creep rupture strength, and improve the weldability of steel, therefore Ti contained Amount is limited to 0.01~0.02%.
V, which is solid-solution in austenite, can improve the quenching degree of steel, but the vanadium that combined form is present, meeting The quenching degree of steel is reduced, increases steel belt roof bolt stability, and has very strong post-curing to act on, Being solid-solution in has extremely strong solution strengthening effect in ferrite, therefore V content is limited to 0.02%~0.05%.
Als is the deoxidier commonly used in steel.A small amount of aluminium is added in steel, can crystal grain thinning, carry High impact toughness, it is too high then to influence hot-working character, welding performance and the machinability of steel, Therefore Als contents are limited to 0.02%~0.05%.
A kind of production technology of 650MPa grades of medium temperature and medium pressure boiler plate is：Molten iron pretreatment- Converter smelting-LF-RH-continuous casting-heating strand-rolling-heat treatment-inspection.Wherein,
Smelting process：Steel-making will carry out desulfurizing iron pretreatment, from cleaning steel scrap, it is ensured that close Gold cleaning drying, slag-stopping tapping, it is desirable to slag thickness of slag layer≤100mm, using LF refining Deep desulfurization process, makes reducing slag, it is ensured that field trash fully floats, and is followed only using VD, VD The ring time >=10min, open calmness time >=3min before pouring；LF stoves feed silico-calcium linear velocity >=2m/s, Line feeding amount >=3~5m/t；
Casting process：Cast after VD vacuum breakers using conticaster, the degree of superheat is less than 25 DEG C, pours Note process will stablize constant speed.Strand it is offline enter stacking slow cooling, more than stacking slow cooling 48h；
Heating technique：By the heating technique for controlling steel billet, it is ensured that the abundant solid solution of alloying element, And effectively suppression original austenite grains are grown up, slab heating temperature is controlled 1150~1250 DEG C, heat 4~6 hours, soaking time 0.5~1.0 hour；
Rolling mill practice：Rolling uses two benches normalizing rolling technique, it is ensured that I stage larger road Secondary reduction ratio, deformation fully infiltration causes steel billet center portion, makes recrystallization zone austenite crystal fully equal Even and fineization, controls II stage start rolling temperature, it is ensured that finishing temperature in Ac3+ (30~50) DEG C, by Needed in finishing temperature narrow range, therefore in control more accurately, with certain production Difficulty.Specific process parameter is：I the stage start rolling temperature >=1100 DEG C, finishing temperature 1050~1000 DEG C, I stage percentage pass reduction 15%~25%, workpiece thickness be finished steel plate 2~2.5 times；II 900~920 DEG C of stage start rolling temperature, 870~890 DEG C of finishing temperature, II It is 50%~65% that stage, which adds up reduction ratio,.Roll rear air cooling.
Heat treatment step：Although the steel plate crystal grain after normalizing rolling is refined, do not obtain Stabilizing tissue finally is obtained, is handled by high tempering, the obdurability matching more stablized Good tempering bainite+ferritic structure, tempering process：650~680 DEG C of holding temperature, 2~4min/mm of soaking time.
In the production technology of the present invention：
I the stage start rolling temperature >=1100 DEG C, 1050~1000 DEG C of finishing temperature：This temperature range For austenite recrystallization area, refine recrystal grain by the deformation of crystal grain, recrystallization, phase Uniform tiny tissue is obtained after change.
15%~25% percentage pass reduction, which is mainly, makes steel billet center portion obtain seepage deformation, it is ensured that The mechanical property of steel plate.
Workpiece thickness is 2~2.5 times of finished steel plate and mainly ensures II stage total deformation rate More than 50%, because total reduction is bigger, ferrite crystal grain is more tiny, and mechanical property of steel plate is got over It is good.
II 900~920 DEG C of stage start rolling temperature, 870~890 DEG C of finishing temperature：This temperature range It is interval for the Ac3+ (30~50) DEG C of steel, i.e. normalizing temperature, it is the pass for ensureing to carry out normalizing rolling Key temperature range.
50%~65% II stage adds up reduction ratio then to obtain tiny original grain.
Beneficial effect：
The beneficial effects of the invention are as follows by brand-new Design of Chemical Composition, using with conventional boiler The different short route of steel plate, low cost, efficient production process route, wherein normal temperature Rm >= 650MPa, -20 DEG C of KV2≥100J；350 DEG C of Rel>=380MPa, 400 DEG C of Rel≥ 365MPa, 450 DEG C of RelThe boiler plate of >=350MPa normal temperature and middle temperature function admirable.
Embodiment
Technical problem of the present invention is solved using following technical proposals：It is a kind of 650MPa grades Medium temperature and medium pressure boiler plate and its production method, its chemical composition mass percent is：C 0.15%~0.23%, Si 0.15%~0.40%, Mn 1.20%~1.60%, S≤0.005%, P ≤ 0.015%, Ni 0.20%~0.40%, Mo 0.30%~0.60%, Ti 0.01%~0.02%, V 0.02%~0.05%, Als 0.02%~0.05%, surplus is Fe and is unavoidably mingled with；Through iron In water desulfurization pretreatment, slag-stopping tapping, it is desirable to slag thickness of slag layer≤100mm, using LF The deep desulfurization process of refining, makes reducing slag, it is ensured that field trash fully floats, using VD, VD The net circulation time >=10min, open calmness time >=3min before pouring；LF stoves hello silico-calcium linear velocity >= 2m/s, line feeding amount >=3~5m/t；Cast after VD vacuum breakers using conticaster, the degree of superheat is less than 25 DEG C, casting process will stablize constant speed.Strand it is offline enter stacking slow cooling, stacking slow cooling 48h with On；Slab heating temperature is controlled at 1150~1250 DEG C, is heated 4~6 hours, soaking time 0.5~1.0 hour；I the stage start rolling temperature >=1100 DEG C, I stage finishing temperature 1050~1000 DEG C, I stage percentage pass reduction 15%~25%, workpiece thickness be finished steel plate 2~2.5 Times；II 900~920 DEG C of stage start rolling temperature, 870~890 DEG C of finishing temperature, II stage add up Reduction ratio is 50%~65%.Roll rear air cooling.
Following examples are used to illustrate present invention, and these embodiments are only in the present invention The general description of appearance, is not limited present invention.Table 1 is steel of the embodiment of the present invention Chemical composition, table 2 be steel of the embodiment of the present invention processing parameter, table 3 for the present invention Embodiment steel mechanical property.
The embodiment chemical composition (wt, %) of table 1
The embodiment processing parameter of table 2
The embodiment mechanical property of table 3
It can be drawn according to result above, the medium temperature and medium pressure boiler plate normal temperature that the present invention is provided Rm >=665MPa, -20 DEG C of KV2≥144J；350 DEG C of Rel>=384MPa, 400 DEG C of Rel >=365MPa, 450 DEG C of Rel>=351MPa, normal temperature and middle temperature function admirable.

Claims (2)

1. a kind of 650MPa grades of medium temperature and medium pressure boiler plate, it is characterised in that in steel chemistry into Divide and be by weight percentage：C 0.15%~0.23%, Si 0.15%~0.40%, Mn 1.20%~1.60%, S≤0.005%, P≤0.015%, Ni 0.20%~0.40%, Mo 0.30%~0.60%, Ti 0.01%~0.02%, V 0.02%~0.05%, Als 0.02%~0.05%, Surplus is Fe and inevitable impurity.
2. a kind of production of 650MPa as claimed in claim 1 grades of medium temperature and medium pressure boiler plates Method, the production technology of steel plate is：Molten iron pretreatment-converter smelting-LF-RH-continuous casting - heating strand-rolling-heat treatment-inspection, it is characterised in that rolling is using two benches just Fiery rolling mill practice, I the stage start rolling temperature >=1100 DEG C, 1050~1000 DEG C of finishing temperature, I Stage percentage pass reduction 15%~25%, workpiece thickness are 2~2.5 times of finished steel plate；Ⅱ 900~920 DEG C of stage start rolling temperature, 870~890 DEG C of finishing temperature, II stage add up reduction ratio For 50%~65%, rear air cooling is rolled, 650~680 DEG C of holding temperature, soaking time is tempered 2~4min/mm.
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CN110669985A (en) * 2019-09-30 2020-01-10 鞍钢股份有限公司 750 MPa-level medium-temperature high-pressure boiler steel plate and production method thereof
CN110669984A (en) * 2019-09-30 2020-01-10 鞍钢股份有限公司 1000 MPa-level medium-temperature and ultrahigh-pressure boiler steel plate and production method thereof
CN110791703A (en) * 2019-09-30 2020-02-14 鞍钢股份有限公司 850 MPa-level medium-temperature high-pressure boiler steel plate and production method thereof
CN110846593A (en) * 2019-11-13 2020-02-28 甘肃酒钢集团宏兴钢铁股份有限公司 Production method of medium-high temperature boiler and pressure vessel steel plate
CN111455255A (en) * 2020-03-30 2020-07-28 江阴兴澄特种钢铁有限公司 Preparation method of EH36 steel for extra-thick offshore wind power with thickness of 80-100mm

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Publication number Priority date Publication date Assignee Title
CN110669985A (en) * 2019-09-30 2020-01-10 鞍钢股份有限公司 750 MPa-level medium-temperature high-pressure boiler steel plate and production method thereof
CN110669984A (en) * 2019-09-30 2020-01-10 鞍钢股份有限公司 1000 MPa-level medium-temperature and ultrahigh-pressure boiler steel plate and production method thereof
CN110791703A (en) * 2019-09-30 2020-02-14 鞍钢股份有限公司 850 MPa-level medium-temperature high-pressure boiler steel plate and production method thereof
CN110669984B (en) * 2019-09-30 2021-01-08 鞍钢股份有限公司 1000 MPa-level medium-temperature and ultrahigh-pressure boiler steel plate and production method thereof
CN110791703B (en) * 2019-09-30 2021-04-02 鞍钢股份有限公司 850 MPa-level medium-temperature high-pressure boiler steel plate and production method thereof
CN110846593A (en) * 2019-11-13 2020-02-28 甘肃酒钢集团宏兴钢铁股份有限公司 Production method of medium-high temperature boiler and pressure vessel steel plate
CN111455255A (en) * 2020-03-30 2020-07-28 江阴兴澄特种钢铁有限公司 Preparation method of EH36 steel for extra-thick offshore wind power with thickness of 80-100mm
CN111455255B (en) * 2020-03-30 2022-05-06 江阴兴澄特种钢铁有限公司 Preparation method of EH36 steel for extra-thick offshore wind power with thickness of 80-100mm

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