CN107287506B - 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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Publication number
CN107287506B
CN107287506B CN201610200259.XA CN201610200259A CN107287506B CN 107287506 B CN107287506 B CN 107287506B CN 201610200259 A CN201610200259 A CN 201610200259A CN 107287506 B CN107287506 B CN 107287506B
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temperature
steel
rolling
stage
medium
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CN107287506A (en
Inventor
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

Abstract

The present invention discloses a kind of 650MPa grades of medium temperature and medium pressure boiler plate and its production method, chemical component is by weight percentage in steel are as follows: 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 stages 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%, are rolled rear air-cooled.650~680 DEG C of tempering 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 industries, are related to a kind of for medium temperature, the boilers and pressure vessel steel in middle pressure ring border and its life Production method.
Background technique
Boiler is a kind of energy conversion, and the energy inputted to boiler has chemical energy, electric energy, high-temperature flue gas in fuel The forms such as thermal energy, and pass through boiler and convert, output outward has steam, high-temperature water or the organic heat carrier of certain thermal energy, long Very important effect has been played in the national economic development since long, is chiefly used in the fields such as thermal power station, ship, locomotive and industrial and mineral. Medium temperature and medium pressure boiler vessel refers mainly to use environment in the boiler of 3.8MPa < pressure < 5.8MPa, 350 DEG C of 450 DEG C of < temperature < Container facility, due to manufacturing the raw material main steel of boiler vessel, exploitation of the iron and steel enterprise for boiler vessel steel plate It attaches great importance to.
Invention disclosed patent " one kind is vanadium titanium combined processing boiler and steels for pressure vessel use and its production method " (201010622957.1), the intensity of steel, but disclosed boiler and steels for pressure vessel use category are improved by vanadium titanium combined processing The lower 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 manufacturing method " (CN103834873A), the alloying elements such as Cr, Ni, Mo, Nb are added on ingredient, pass through traditional static ingot+rolling+offline heat Treatment process guarantees the properties of steel plate, and complex process is cumbersome.
Patent of invention " a kind of pressure vessel steel 18MnMoNbR and its 100mm thickness board production technology " (CN103160740A) and in " metal material and metallurgical engineering " paper " the pressure vessel spy's thickness 18MnMoNbR steel delivered The technological process of production of the development of kind ", open steel grade is essentially electric furnace+molding+rolling+heat treatment, although Composition And Process meets Plate property requirement, but equally exist the problems such as manufacturing process is complicated, the production cycle is long.
More precious metal element is added in the design of ingredient that patent of invention disclosed above has to increase cost, have Although being not added with more alloying element but intensity rank being lower；Mostly use static ingot as raw material, production efficiency greatly in technique It is low, higher cost, and heat treatment process uses offline normalizing+tempering substantially, further increases process cost.On solving Problems present in publication are stated, the invention is intended to use a kind of reasonable Design of Chemical Composition, i.e., improve carbon in right amount Content, addition Ni, Mo alloying element and V, Ti microalloy element, enhance the room temperature and medium temperature intensity of steel, by revolving furnace continuous casting, Line normalizing rolling+be tempered production process route offline effectively reduces production process cost, guarantees the normal of the rank boiler plate Temperature and medium temperature performance.
Summary of the invention
For the deficiencies in the prior art, the present invention passes through completely new Design of Chemical Composition, use and conventional boiler The different production process route of container fabrication process obtains the boiler plate that toughening type matches excellent medium temperature function admirable.
The technical scheme is that the design of alloy of steel, by weight percentage are as follows: 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 For Fe and unavoidably it is mingled with；
Details are as follows the reasons why alloying element C, Si, Mn, P, S, Ni, Mo, Ti, V, Als limited amount in steel plate:
C is the main element for improving hardness of steel, and the intensity of steel is improved by solution strengthening and precipitation strength, improves through hardening Property, and guarantee the intensity rank and high-temperature behavior of steel；Carbon content is excessively high, and will affect the welding performance of steel.Therefore in the present invention The content of C is limited to 0.15%~0.23%.
Si is used as reducing agent and deoxidier in steelmaking process, and Si and Mo, Cr etc. are combined, and is improved corrosion resistance and antioxygen The effect of change when more than 0.5%, will cause the toughness decline of steel, reduce the welding performance of steel, therefore by Si content in the present invention It is limited to 0.15%~0.40%.
Mn can increase the toughness, intensity and hardness of steel, is the element of strong stable austenite, can be effectively reduced austenite Decomposition rate, improve the harden ability of steel, Mn content height can enhance temper brittleness, therefore control Mn content range be 1.20%~ 1.60%.
S and P is harmful element in steel, increases the brittleness of steel, therefore should reduce content of the p and s in steel to the greatest extent, this The content of S, P are limited respectively in invention are as follows: S≤0.005%, P≤0.015%.
Mo improves the harden ability of steel, when content 0.5% or so, can reduce temper brittleness, there is post-curing effect.Improve heat Epistasis and creep strength, but Mo too high levels will lead to the embrittlement of steel instead, therefore be limited to Mo content in the present invention 0.30%~0.60%.
Ni can improve the intensity, toughness of steel plate, and have good harden ability, improve plasticity and toughness, improve corrosion resistance Can, be used in combination with molybdenum, enhance heat resistance, be one of the main alloy element of refractory steel and stainless acid resistant steel, but due to Ni at This is higher, therefore Ni content is limited to 0.20%~0.40%
Ti solution strengthening effect is strong, but reduces the toughness of solid solution, is solid-solution in the harden ability for improving steel in austenite, improves Temper resistance, and have post-curing effect, improves the inoxidizability and heat resistance of steel, such as creep and creep rupture strength, and improves The weldability of steel, therefore Ti content is limited to 0.01~0.02%.
V is solid-solution in the harden ability that steel can be improved in austenite, but vanadium existing for combined form, can reduce the harden ability of steel, Increase steel belt roof bolt stability, and there is very strong post-curing to act on, being solid-solution in ferrite has extremely strong solution strengthening effect, Therefore V content is limited to 0.02%~0.05%.
Als is common deoxidier in steel.A small amount of aluminium is added in steel, can refine crystal grain, improves impact flexibility, it is excessively high then Hot-working character, the welding performance and cutting performance of steel are influenced, therefore Als content is limited to 0.02%~0.05%.
A kind of production technology of 650MPa grades of medium temperature and medium pressure boiler plate are as follows: molten iron pretreatment-converter smelting-LF- RH-continuous casting-slab heating-rolling-heat treatment-inspection.Wherein,
Smelting process: steel-making will carry out desulfurizing iron pretreatment, select cleaning steel scrap, guarantee that alloy cleans drying, pushing off the slag Tapping, it is desirable that slag thickness of slag layer≤100mm makes reducing slag using LF refining depth desulfurization process, it is ensured that field trash sufficiently on Floating, using VD, the VD net circulation time >=10min opens calmness time >=3min before pouring；LF furnace feeds silico-calcium linear velocity >=2m/s, feeds Line amount >=3~5m/t；
Casting process: it is cast after VD vacuum breaker using conticaster, for the degree of superheat less than 25 DEG C, casting process will stablize constant speed. Slab is offline into stacking slow cooling, stacking slow cooling 48h or more；
Heating process: the heating process by controlling steel billet, it is ensured that alloying element is sufficiently dissolved, and effectively inhibits original Austria Family name's body crystal grain is grown up, and slab heating temperature is controlled at 1150~1250 DEG C, is heated 4~6 hours, soaking time 0.5~1.0 is small When；
Rolling mill practice: rolling uses two stages normalizing rolling technique, guarantees I stage biggish percentage pass reduction, and deformation is filled Divide infiltration to cause steel billet center portion, make the full and uniform refinement of recrystallization zone austenite grain, controls II stage start rolling temperature, it is ensured that finish to gauge Temperature is in Ac3+ (30~50) DEG C, due to finishing temperature narrow range, needs more accurate, has certain in control Production difficulty.Specific process parameter are as follows: I the stage start rolling temperature >=1100 DEG C, 1050~1000 DEG C of finishing temperature, I stage passage Reduction ratio 15%~25%, 2~2.5 times that workpiece thickness is finished steel plate；II 900~920 DEG C of stage start rolling temperature, finish to gauge It is 50%~65% that 870~890 DEG C of temperature, II stage, which add up reduction ratio,.It rolls rear air-cooled.
Heat treatment procedure: although the steel plate crystal grain after normalizing rolling is refined, final stabilization group is not obtained It knits, is handled by high tempering, obtain more stable obdurability and match good tempering bainite+ferritic structure, tempering Technique: 650~680 DEG C of holding temperature, 2~4min/mm of soaking time.
In production technology of the invention:
I the stage start rolling temperature >=1100 DEG C, 1050~1000 DEG C of finishing temperature: this temperature range be austenite recrystallization Area refines recrystal grain by the deformation of crystal grain, recrystallization, uniformly tiny tissue is obtained after phase transformation.
15%~25% percentage pass reduction mainly makes steel billet center portion obtain seepage deformation, guarantees the mechanical property of steel plate Energy.
Workpiece thickness is that 2~2.5 times of finished steel plate mainly guarantee that II stage total deformation rate is greater than 50%, because always Reduction ratio is bigger, and ferrite crystal grain is more tiny, and mechanical property of steel plate is better.
II 900~920 DEG C of stage start rolling temperature, 870~890 DEG C of finishing temperature: this temperature range be steel Ac3+ (30~ 50) DEG C, i.e. normalizing temperature section, is the key temperatures section for guaranteeing to carry out normalizing rolling.
50%~65% II stage adds up reduction ratio then to obtain tiny original grain.
The utility model has the advantages that
The beneficial effects of the invention are as follows completely new Design of Chemical Composition is passed through, using the short stream different from conventional boiler steel plate Journey, low cost, efficient production process route, wherein room 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 room temperature and medium temperature function admirable.
Specific embodiment
The present invention relates to the technical issues of adopt the following technical solutions solution: a kind of 650MPa grades of medium temperature and medium pressure boiler plate And its production method, chemical component mass percent are as follows: 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 are Fe and are unavoidably mingled with；Through Desulfurizing iron pre-processes, in slag-stopping tapping, it is desirable that slag thickness of slag layer≤100mm makes reduction using LF refining depth desulfurization process Slag, it is ensured that field trash sufficiently floats, and using VD, the VD net circulation time >=10min opens calmness time >=3min before pouring；LF furnace is fed Silico-calcium linear velocity >=2m/s, line feeding amount >=3~5m/t；It is cast after VD vacuum breaker using conticaster, the degree of superheat is less than 25 DEG C, casting Process will stablize constant speed.Slab is offline into stacking slow cooling, stacking slow cooling 48h or more；Slab heating temperature control 1150~ It 1250 DEG C, heats 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 2~2.5 times of finished steel plate；II stage 900~920 DEG C of start rolling temperature, 870~890 DEG C of finishing temperature, II stage accumulative reduction ratio are 50%~65%.It rolls rear air-cooled.
For following embodiment for illustrating the content of present invention, these embodiments are only the general description of the content of present invention, The content of present invention is not limited.Table 1 is the chemical component of steel of the embodiment of the present invention, and table 2 is steel of the embodiment of the present invention Processing parameter, table 3 are steel mechanical property of the embodiment of the present invention.
1 embodiment chemical component (wt, %) of table
2 embodiment processing parameter of table
3 embodiment mechanical property of table
According to result above it can be concluded that, medium temperature and medium pressure boiler plate room temperature Rm >=665MPa provided by the invention, -20 DEG C KV2≥144J；350 DEG C of Rel>=384MPa, 400 DEG C of Rel>=365MPa, 450 DEG C of Rel>=351MPa, room temperature and middle warm nature It can be excellent.

Claims (1)

1. a kind of production method of 650MPa grades of medium temperature and medium pressure boiler plate, the production technology of steel plate are as follows: molten iron pretreatment-turn Furnace smelting-LF-RH-continuous casting-slab heating-rolling-heat treatment-inspection, which is characterized in that
Chemical component is by weight percentage in steel are as follows: and C 0.15%~0.23%, Si 0.15%~0.38%, Mn 1.20%~ 1.55%, S≤0.005%, P≤0.015%, Ni 0.20%~0.38%, Mo 0.30%~0.59%, Ti 0.01%~ 0.02%, V 0.02%~0.045%, Als 0.02%~0.037%, surplus are Fe and inevitable impurity；
Rolling use two stages normalizing rolling technique, I the stage start rolling temperature >=1100 DEG C, 1050~1000 DEG C of finishing temperature, I rank Section percentage pass reduction 15%~25%, 2~2.5 times that workpiece thickness is finished steel plate；II stage start rolling temperature 900~920 DEG C, 870~890 DEG C of finishing temperature, II stage add up reduction ratio be 50%~65%, roll it is rear air-cooled, tempering temperature 650~ 680 DEG C, 2~4min/mm of soaking time.
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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
CN110669985B (en) * 2019-09-30 2021-01-08 鞍钢股份有限公司 750 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
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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