CN109182919A - A kind of production method of heterogeneous structure high-toughness ship plate steel EH47 - Google Patents
A kind of production method of heterogeneous structure high-toughness ship plate steel EH47 Download PDFInfo
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- CN109182919A CN109182919A CN201811401096.7A CN201811401096A CN109182919A CN 109182919 A CN109182919 A CN 109182919A CN 201811401096 A CN201811401096 A CN 201811401096A CN 109182919 A CN109182919 A CN 109182919A
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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
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- 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
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/18—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
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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
- C22C38/18—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
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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
- C22C38/18—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
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- 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
- C21D2211/001—Austenite
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- 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
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- 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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- Mechanical Engineering (AREA)
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Abstract
A kind of heterogeneous structure high-toughness ship plate steel EH47 and its production method, the chemical composition weight percent of steel are carbon=0.04 ~ 0.08, silicon=0.15 ~ 0.35, manganese=1.60 ~ 1.80, phosphorus≤0.015, sulphur≤0.005, niobium≤0.03 ~ 0.04, titanium≤0.008 ~ 0.02, aluminium=0.015 ~ 0.05, nickel=0.30 ~ 0.40, copper=0.25 ~ 0.35, chromium=0.15 ~ 0.25%, remaining is Fe and inevitable impurity.Processing step includes that processing step includes smelting, continuous casting, rolling, relaxation, cooling.The method of the present invention breaks through the limitation of tradition TMCP technique rolling continuous casting base compression ratio, is not required to additional heat treatment process；It produces low-temperature impact and requires -40 DEG C of ductility steel plates below, maximum gauge can reach 100mm, and product can be widely applied to the manufacture of the multiple fields slab such as shipbuilding, marine worker, wind-powered electricity generation, bridge, building and engineering machinery；The method of the present invention can be realized using steel mill's existing equipment and process conditions, that is, be not required to increase investment and scrap build, and improve production efficiency, energy-saving consumption-reducing.
Description
Technical field
The invention belongs to metallurgical technology fields, are related to the production method of heterogeneous structure high-toughness ship plate steel EH47 a kind of.
Background technique
When the cut deal product that using continuous casting billet production there is high tenacity to require, traditional rolling mode only works as entrance
The austenite structure of phase transformation is that the ferritic-pearlitic tissue or bainite structure when uniformly refinement, after product transformation just have
There are good intensity and toughness, therefore traditional TMCP technique is generally only used for rolling 50mm thin plate below.For 50mm
The above slab, due to the limitation of compression ratio, original austenite grain cannot be recrystallized adequately and carefully during the rolling process
Change, organize general coarseer, degraded toughness, usually to add heat treatment process, just can guarantee the obdurability matching of slab, in this way
Production cost is increased, the production cycle is also extended.In addition, the cut deal product of TMCP technique production is general in the world at present
It is all the one phase matrix tissue of pure iron ferritic or pure bainite, although iron element can also be obtained sometimes by control steel rolling parameter
Body and Martensite-Bainite Mixed Microstructure or heterogeneous structure, but typically although the coarseer grain shellfish tissue of crystal grain, intensity improve,
But plasticity and toughness are deteriorated.
Chinese patent 200680039706.2 discloses a kind of " for manufacturing the side of the hot-rolled band with heterogeneous structure
Method " is added higher by the method for hot continuous rolling process production TRIP steel (phase change induction plasticity steel) in ingredient design
Carbon, and the content of Ni is not required, the component system be only applicable to production hot continuous rolling or cold-rolling thickness≤16mm strip or
Roll bending, it is not applicable for the cut deal individually rolled.Chinese patent 201180011390.7 discloses one kind, and " heterogeneous structure is stainless
Steel plate and steel band and their manufacturing method " forms iron by carrying out offline multiphase annealing to cold rolled stainless steel sheet or steel band
The heterogeneous structure of ferritic and martensite, there are notable differences with on-line rolling of the invention.Chinese patent 201410791739.9
Disclose the chemical component of " a kind of straight seam welded pipe X90 rank heterogeneous structure Pipeline Steel Plate and its manufacturing method " its summary of the invention
It is different from the present invention, is added to Mo element, higher cost, and add although intensity that Mo element is remarkably improved steel plate, but
It can inhibit the aggregation and spreading of carbide, to inhibit ferritic generation, promote the generation of granular bainite, to the original Austria of rolling
The center toughness of the biggish thick steel plates of family name's body crystal grain is unfavorable, therefore is only applicable to thickness and produces in 30mm pipe line steel below
Product are not suitable for the thick steel plates of 50mm or more.Cooling velocity after rolling in its production technology simultaneously reaches 25 ~ 35 DEG C/s,
The roller repairing capacity of equipment of Wide and Thick Slab manufacturing enterprise is inadequate at present, and especially steel plate of the thickness greater than 50mm is difficult to realize so
Big cooling velocity.
Summary of the invention
The present invention is intended to provide a kind of production method of heterogeneous structure high-toughness ship plate steel EH47, especially produce with a thickness of
The slab of 50 ~ 100mm overcomes the shortcomings of existing TMCP technology, meets industry development demand, realizes energy-saving, low-carbon
The green steel theory of environmental protection.
Technical solution of the present invention:
A kind of heterogeneous structure high-toughness ship plate steel EH47 and its production method, the chemical composition weight percent of steel be carbon=0.04 ~
0.08, silicon=0.15 ~ 0.35, manganese=1.60 ~ 1.80, phosphorus≤0.015, sulphur≤0.005, niobium=0.03 ~ 0.04, titanium=0.008 ~
0.02, aluminium=0.015 ~ 0.05, nickel=0.30 ~ 0.40, copper=0.25 ~ 0.35, chromium=0.15 ~ 0.25%, remaining is for Fe and unavoidably
Impurity；Processing step includes:
It smelts: converter tapping [C]≤0.005 or less；Using LF+RH refinery practice, LF furnace refines whole Argon, when white slag is kept
Between >=20min, RH Fruit storage, outbound molten steel [N]≤40ppm, [H]≤1.5ppm；
Continuous casting: being cast using whole process protection, slab thickness >=300mm, and control slab center portion is segregated class≤0.5 grade C；
Rolling: use two-phase control rolling, roughing finishing temperature >=980 DEG C, intermediate base >=2 times plate thickness, finish rolling start rolling temperature 730 ~
760 DEG C, 720 DEG C~750 DEG C of finishing temperature；
Relaxation: rear relaxation is rolled to 10 ~ 20 DEG C of Ar3 or less, it is cooling that relaxation time control reenters water in ferrite transformation 1/3；
Cooling: using the ultrafast cold technique of the DQ of Mulpic, cooling rate requires 5 ~ 10 DEG C/S of steel plate center portion, final cooling temperature≤200
℃。
The high-toughness ship plate steel EH47 of above method production organizes as pro-eutectoid ferrite+low-carbon bainite+a small amount of remnants
The heterogeneous structure of austenite, wherein ferritic volume fraction is 25% ~ 40%, the volume fraction of bainite is 50% ~ 70%, MA
The volume fraction of constituent element is 5% ~ 15%.Steel plate thickness be 50 ~ 100mm, 460 ~ 530MPa of yield strength, tensile strength 570 ~
660Mpa, -40 DEG C of center portion impact flexibility of low temperature reach 200J or more, carbon equivalent Ceq≤0.45.
Innovation principle: traditional handicraft generally passes through the recrystallization of rough rolling step austenite and finish rolling stage crystal grain flattens
The mode of elongation refines crystal grain.The present invention is by ingredient design, zerolling, relaxation and strong cold technique, to the phase after rolling
Become tissue accuracy controlling, form tiny heterogeneous structure, to refine original austenite grains, reaches the mesh for improving steel plate obdurability
's.
Solid-state phase changes principle: in the operation of rolling, the finish rolling stage completes finish to gauge more than Ar3 point；Thermophase is waited for into relaxation,
Proeutectoid ferrite knows from experience the preferential conversion near austenite grain boundary.When the ferritic volume fraction of transformation reaches 1/3, enter
Mulpic is rapidly cooled, and the austenite for the supercooling not changed can quickly enter bainite transformation section, is cooled down by control
For speed in 5 ~ 10 DEG C/S, overcooling austenite is gradually converted into the low-carbon bainites tissues such as needle iron, grain shellfish and plate shellfish, at the same with first altogether
Analysis ferrite completes the cutting to coarse original austenite grains together, forms tiny crystal grain, improves the toughness of steel plate.It is surplus
The overcooling austenite of Yu Wei transformation then becomes the island MA constituent element with further decreasing into martensite transfor mation section for temperature, most
End form is at pro-eutectoid ferrite+low-carbon bainite+a small amount of retained austenite mixing heterogeneous structure.
Design of Chemical Composition uses the design concept of low-carbon.The raising of C content, although can be improved intensity and reduce Ar3
Temperature, but deteriorate the low-temperature flexibility and welding performance of steel, while pearlite when the ingredient of low C can inhibit high temperature ferritic transformation
It is formed, promotes the transformation of bainite, therefore control C content 0.04 ~ 0.08%.Manganese is weak carbide formation element, it can be dropped
Low austenite transformation temperature, fining ferrite grains are beneficial to raising armor plate strength and toughness.In order to improve intensity and not shadow
Impact flexibility is rung, on the basis of C-Mn steel solution strengthening, the alloying elements such as compound addition Nb, Ti, Ni, Cr, Cu are given full play to
The effects of refinement crystal grain, precipitation strength and phase transformation strengthening, is to reach high-intensitive, high tenacity and excellent welding performance purpose.Ni pairs
The toughness for improving steel plate is particularly critical, can effective disperse C compound aggregation, stablize overcooling austenite, inhibit ferrite and bayesian
Body crystal grain is grown up.When content is greater than 0.3%, in conjunction with the ultrafast cold technique of DQ of Mulpic, roller repairing rate is controlled 5 ~ 10
DEG C/S, the compound heterogeneous structure based on pro-eutectoid ferrite and low-carbon bainite is ultimately formed, is completed to original austenite crystalline substance
The cutting of grain improves low-temperature flexibility.But Ni is expensive, and excessive addition will increase manufacturing cost, therefore the upper limit is set as
0.4%。
Outstanding feature and remarkable result of the invention is mainly reflected in:
(1) present invention breaks through the limitation of tradition TMCP technique rolling continuous casting base compression ratio, is not required to additional heat treatment process, produces low temperature
Impact requires -40 DEG C of ductility steel plates below, and maximum gauge can reach 100mm, while guaranteeing product quality, reduces and closes
Gold content and production cost shorten the delivery cycle.
(2) present invention utilizes upper general steel mill's existing equipment and process conditions, that is, is not required to increase investment and scrap build, again
Improve production efficiency, energy-saving consumption-reducing.
(3) product of the invention is economizing type, low-carbon environment-friendly steel new varieties, can be widely applied to shipbuilding, marine worker, wind
The manufacture of the multiple fields slab such as electricity, bridge, building and engineering machinery.
Detailed description of the invention
The typical metallographic structure (500X) of Fig. 1 deck of boat EH47 produced by the invention.
Specific embodiment
The main contents such as the Composition Control range of the present invention, preferred forms are made furtherly below with reference to embodiment
It is bright:
Embodiment 1:
A kind of production method of heterogeneous structure high-toughness ship plate steel EH47, steel chemical component composition weight percent be carbon=
0.05, silicon=0.21, manganese=1.68, phosphorus=0.009, sulphur=0.0017, niobium=0.039, titanium=0.015, aluminium=0.045, nickel=0.38,
Copper=0.28, chromium=0.18, remaining is Fe and inevitable impurity.Processing step includes: to smelt, and converter tapping [C=]=
0.0024, using LF+RH refinery practice, the whole Argon of LF furnace refining, white slag retention time 21min, RH Fruit storage, out
Stand molten steel [N]=38 ppm, [H]=1.1ppm；Continuous casting is cast using whole process protection, slab thickness 300mm, and slab low power center portion is inclined
0.5 grade of C class of analysis.
The EH47 deck of boat of the present embodiment slab mill product thickness 50mm, heating temperature is 1154 DEG C, using two stages
Rolling, 1023 DEG C of first stage roughing finishing temperature, intermediate base 120mm, 758 DEG C of second stage finish rolling start rolling temperature, finish to gauge temperature
Degree is at 732 DEG C；It rolls rear steel plate relaxation 89S and enters water cooling, enter 702 DEG C of water steel billet temperature, carried out using the DQ technique of Mulpic cold
But, cooling 9.8 DEG C/S of Mean Speed, 152 DEG C of final cooling temperature.Mechanical property of steel plate is shown in Table 1.
Embodiment 2:
A kind of production method of heterogeneous structure high-toughness ship plate steel EH47, steel chemical component composition weight percent be carbon=
0.07, silicon=0.23, manganese=1.65, phosphorus=0.008, sulphur=0.0023, niobium=0.036, titanium=0.012, aluminium=0.042, nickel=0.36,
Copper=0.28, chromium=0.20, remaining is Fe and inevitable impurity.Processing step includes: to smelt, converter tapping [C]
0.0038%, using LF+RH refinery practice, the whole Argon of LF furnace refining, white slag retention time 23min, RH Fruit storage,
Outbound molten steel [N]=37 ppm, [H]=1.2ppm；Continuous casting is cast using whole process protection, middle packet slab thickness 300mm, slab low power
Center portion is segregated 0.5 grade of C class.
The EH47 deck of boat of the present embodiment slab mill product thickness 80mm, heating temperature is 1182 DEG C, using two stages
Rolling, 1062 DEG C of first stage roughing finishing temperature, intermediate base 185mm, 739 DEG C of second stage finish rolling start rolling temperature, finish to gauge temperature
Degree is at 728 DEG C；It rolls rear steel plate relaxation 246S and enters water cooling, enter 696 DEG C of water steel billet temperature, carried out using the DQ technique of Mulpic cold
But, cooling 6.4 DEG C/S of Mean Speed, 85 DEG C of final cooling temperature.Mechanical property of steel plate is shown in Table 1.
Embodiment 3:
A kind of production method of heterogeneous structure high-toughness ship plate steel EH47, steel chemical component composition weight percent be carbon=
0.06, silicon=0.23, manganese=1.66, phosphorus=0.010, sulphur=0.0015, niobium=0.038, titanium=0.016, aluminium=0.049, nickel=0.38,
Copper=0.30%, chromium=0.21, remaining is Fe and inevitable impurity.Processing step includes: to smelt, and converter tapping [C]=
0.0032, using LF+RH refinery practice, the whole Argon of LF furnace refining, white slag retention time 22min, RH Fruit storage, out
Stand molten steel [N]=38 ppm, [H]=1.0ppm；Continuous casting is cast using whole process protection, middle packet slab thickness 300mm, the slab low power heart
Portion is segregated 0.5 grade of C class.
The EH47 deck of boat of the present embodiment slab mill product thickness 100mm, heating temperature is 1208 DEG C, using two stages
Rolling, 1026 DEG C of first stage roughing finishing temperature, intermediate base 205mm, 731 DEG C of second stage finish rolling start rolling temperature, finish to gauge temperature
Degree is at 725 DEG C；It rolls rear steel plate relaxation 308S and enters water cooling, enter 688 DEG C of water steel billet temperature, carried out using the DQ technique of Mulpic cold
But, cooling 5.2 DEG C/S of Mean Speed, 35 DEG C of final cooling temperature.Mechanical property of steel plate is shown in Table 1.
The mechanical property of EH47 steel in 1 embodiment of table
From 1 test result of table as it can be seen that the EH47 steel plate produced using method of the invention, 50 ~ 100mm of thickness specification pass through tune
Control out heterogeneous structure of the ferrite content 30% or so, 460 ~ 530MPa of yield strength, 570 ~ 660Mpa of tensile strength, low temperature-
40 DEG C of center portion impact flexibility reach 200J or more, carbon equivalent (Ceq)≤0.45, collect high-intensitive, high tenacity and high welding performance in
One, can be good at the use demand for meeting super large marine steel.
Claims (1)
1. a kind of heterogeneous structure high-toughness ship plate steel EH47 and its production method, the chemical composition weight percent of steel be carbon=
0.04~0.08, silicon=0.15~0.35, manganese=1.60~1.80, phosphorus≤0.015, sulphur≤0.005, niobium=0.03~0.04, titanium=
0.008~0.02, aluminium=0.015~0.05, nickel=0.30~0.40, copper=0.25~0.35, chromium=0.15~0.25%, remaining is
Fe and inevitable impurity；Processing step includes:
It smelts: converter tapping [C]≤0.005 or less；Using LF+RH refinery practice, LF furnace refines whole Argon, when white slag is kept
Between >=20min, RH Fruit storage, outbound molten steel [N]≤40ppm, [H]≤1.5ppm；
Continuous casting: being cast using whole process protection, slab thickness >=300mm, and control slab center portion is segregated class≤0.5 grade C；
Rolling: use two-phase control rolling, roughing finishing temperature >=980 DEG C, intermediate base >=2 times plate thickness, finish rolling start rolling temperature 730~
760 DEG C, 720 DEG C~750 DEG C of finishing temperature；
Relaxation: rear relaxation is rolled to 10~20 DEG C of Ar3 or less, it is cooling that relaxation time control reenters water in ferrite transformation 1/3；
Cooling: using the ultrafast cold technique of the DQ of Mulpic, cooling rate requires 5~10 DEG C/S of steel plate center portion, final cooling temperature≤200
℃。
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| CN109722601A (en) * | 2019-03-17 | 2019-05-07 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of the super-thick steel plate Q420E of low-carbon-equivalent |
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| CN110616377A (en) * | 2019-11-06 | 2019-12-27 | 湖南华菱湘潭钢铁有限公司 | Production method of low-yield-ratio high-toughness Q460GJ |
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