CN102796967B - 800 MPa economic corrosion-resistance and high-strength steel plate - Google Patents
800 MPa economic corrosion-resistance and high-strength steel plate Download PDFInfo
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Abstract
The invention belongs to the field of metal material manufacturing, and relates to an 800 MPa economic corrosion-resistance and high-strength steel plate which comprises main chemical components in percent by weight: 0.12 to 0.16 percent of C, 0.20 to 0.40 percent of Si, 1.20 to 1.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.015 to 0.060 percent of Al, 0.015 to 0.040 percent of Ti, 0.12 to 0.30 percent of Ni, 0.40 to 0.60 percent of Cr, 0.15 TO 0.40 percent of Cu, and the balance of Fe and inevitable impurities. The 800 MPa economic corrosion-resistance and high-strength steel plate has the benefits that the alloy cost is low, Cr-Ni-Cu for ensuring corrosion resistance is adopted instead of precious alloys such as Mo and Nb, the mixing amount of all elements is reasonably adjusted according to the principles that elements are added economically and varieties are as fewer as possible, the various function parameters of the steel plate are ensured, the production cost is lowered, no B element addition ensures the large heat input welding performance of the steel plate, the welding performance is excellent, the organic integration of high corrosion resistance, high strength, high toughness and excellent welding performance is achieved, and low Pcm value and the low Ceq value can ensure low-temperature preheating or no-preheating welding.
Description
Technical field
The invention belongs to metallic substance and manufacture field, relate to a kind of 800MPa Economic corrosion-resistant high tensile steel plate.
Background technology
Along with the continuous growth of the mankind to energy demand, the exploitation to coal resources have been strengthened both at home and abroad, coal exploitation technology improves constantly, add the development of modern industrial technology, closely-related coal mine machinery is just towards maximization, high parametrization and long-life future development with it, requirement to ferrous materials performance is more and more higher, especially coal mine machinery supporting structure adopts the intensity rank of steel plate more and more higher, the above High Strength Steel Plate of yield strength 460MPa is used widely, even surrenders other steel plate of 890MPa level and starts application.
For guaranteeing Safety of Coal Mine Production, must guarantee that coal mine machinery has enough safe reliabilities, its sheet stock and welding joint thereof are had relatively high expectations, so it should meet: (1) high surrender and tensile strength, high-plasticity, high uniformity and stability; (2) material weldability is good, can adapt to larger heat input welding, compares its HAZ(welded heat affecting zone with mother metal) the not obvious reduction of plasticity and toughness; (3) fabrication weldability is good, low preheating temperature or do not need pre-thermo-welding, and postwelding does not produce welding cold cracking; (4) for adapting to the moist operating environment in down-hole, steel plate requires to have high corrosion resistance nature.
Because the high tensile steel plate huge market demand for coal machine, technical requirements are high, the needs of building for meeting the coal industry of development, domestic a large amount of research and discoveries has been carried out in the aspects such as high tensile steel plate strengthening mechanism, Corrosion Resistant Mechanism and welded heat affecting zone structure property feature, and formed some weathering resistance high tensile steel plate method of manufacturing technology.As " a kind of yield strength 450MPa grade high-strength weathering steel plate and production method thereof " (application number CN201010180589.X), " a kind of 600MPa grade high-strength weathering steel and preparation method thereof " (application number CN200710032112.5), " ultrahigh-strength steel and the manufacture method thereof with excellent corrosion resistance and fatigue resistance " (application number 200610019667.1), " low temperature high toughness weather corrosion resistant steel and the production method thereof with 600MPa level " (application number 200510019116.0), " a kind of high-strength weathering steel and production method thereof " (application number 200610125365.2), " a kind of low-cost non-quenched and tempered high-strength weathering steel with yield strength level of 700 MPa and manufacture method thereof " (application number CN201010246778.2).These prior aries, mainly there are the following problems:
(1) intensity rank is low, has high tensile steel plate that the High Strength Steel Plate of corrosion resistance nature is generally only applicable to tensile strength≤700MPa (as application number: CN201010180589.X; CN200710032112.5) etc.), although also there is intensity the higher person (application number 200610019667.1; CN201010246778.2), but it adopts hot continuous rolling production technique, limited by processing unit, and steel plate thickness is difficult to meet the demand that coal machine maximizes to slab.
(2) weldability is poor, generally only adapts to the processing condition welding of welding heat input below 25kJ/cm while adopting MAG weldering.The Pcm of some steel plate and Ceq are higher in addition, as the composition that application number 200610019667.1 is adopted, and its Pcm≤0.30%, Ceq≤0.65%.
(3) cost of alloy is high, for high-strength corrosion-resistant steel plate, great majority adopt the conventional alloy designs mode of the corrosion-resistant steels such as Cu-Cr-Ni-Mo-Nb, these elements are noble metal, cost of alloy is higher, if application number is 200610125365.2 related technology, it contains the alloying elements such as more chromium Cr, niobium Nb, molybdenum Mo, surrender degree as disclosed in US20040118489 is that 800MPa steel alloy also adopts the alloying elements such as more chromium Cr, niobium Nb, molybdenum Mo in addition, cost of alloy is higher, is difficult to realize batch production under present steel situation.
(4) add the hardening capacity that boron guarantees steel.The above rank high tensile steel plate of tensile strength 600MPa adopts quenching and tempering type production technology substantially, nearly all by adding B, to guarantee the hardening capacity of steel, can cause like this hardness of welding the rear steel plate hot zone of influence to significantly improve, the toughness of infringement welding welded bonds, add B element easily at Grain Boundary Segregation, cause welding joint toughness sharply to decline, as application number: the high tensile steel plates such as CN201010125410.0, CN200710045329.X all add B and improve hardening capacity.
Summary of the invention
In view of the foregoing, the object of this invention is to provide a kind of 800MPa anti-corrosion and high strength steel plate, solve High Strength Structural Steel weldability, corrosion-resistant and the low problem of obdurability for coal machine.This steel plate is by reducing noble metal content in composition, coordinate suitable smelting process, rolling and heat treatment technics, reduce production costs and organization of production difficulty, the steel plate obtaining has good erosion resistance, weldability, steel plate tensile strength is more than 800MPa, and tissue, performance are even, can be adapted to larger heat input welding, this steel plate can be applicable to the manufacture of coal mine machinery structural part, safe and reliable.
The present invention is achieved by the following technical solutions:
A kind of 800MPa anti-corrosion and high strength steel plate, its main chemical compositions weight percent is: C:0.12～0.16%, Si:0.20～0.40%, Mn:1.20～1.50%, P≤0.015%, S≤0.005%, Al:0.015～0.060%, Ti:0.015～0.040%, Ni:0.12～0.30%, Cr:0.40～0.60%, Cu:0.15～0.40, all the other are Fe and inevitable impurity.
The chemical composition of above-mentioned steel also meets carbon equivalent and welding crack sensibility coefficient requires:
Carbon equivalent:
C
eq=C+Mn/6+（Cr+Mo+V）/5+（Cu/+Ni）/15≤0.52%
Welding crack sensibility coefficient:
P
cm＝C+Si/30+Ni/60+(Mn+Cr+Cu)/20+Mo/15+V/10+5B≤0.28%。
The thickness of above-mentioned steel plate is 8～50mm.
The concrete steps of above-mentioned 800MPa anti-corrosion and high strength steel plate manufacture method are:
A.KR molten iron is processed: massfraction≤0.0020% that makes sulphur by the pre-desulfurization of KR;
B. white silk is blown in converter: in converter region by top blast or push up the low compound white silk that blows;
C.LF stove refining: LF refining stage carries out trimming, makes C
eq≤ 0.52% and P
cm≤ 0.28%;
D.RH refining: RH refining stage deep desulfuration makes massfraction≤0.005% of sulphur, reduce the content of oxygen, hydrogen, nitrogen, make oxygen content≤0.0030%, hydrogen content≤0.0002%, a nitrogen content≤0.0040%, and the inclusion that cannot remove is carried out to nodularization morphology Control;
E: sheet billet continuous casting: the continuous casting stage is by induction stirring and the weak cold control of bending section;
F: heating phase: heating steel billet to 1180～1250 ℃, insulation 8-12min/mm;
G: roughing, finish rolling stage: at austenite, recrystallization zone can occur billet rolling is become to intermediate blank, guarantee this percentage pass reduction >=15%, refine austenite crystal grain stage Mo; At austenite non-recrystallization, start finish rolling, at austenite, before bainite transformation, be rolled into steel plate, final rolling temperature is controlled at 900 ℃～Ar3+80 ℃, and cumulative deformation >=65% makes extreme trace time last pass deformation rate 20～25%;
H: quench treatment, temper stage: roll rear steel plate stacking slow cooling to room temperature, obtain the tiny normalizing rolling tissue of homogeneous microstructure; Steel plate after rolling is carried out to quench treatment, holding temperature Ac3+30～60 ℃, soaking time is 2min/mm+0～10min; Steel plate after quenching is carried out to 580 ℃～650 ℃ high temperings, and soaking time is 1.5～2.5min/mm+0～10min.
In order to guarantee object of the present invention, make steel plate there is the high-intensity while, have good plasticity and toughness, good welding property and high corrosion resistance nature, details are as follows for the reason that just in the present invention, C, Mn, S, P, Si, Al, Ti, Ni, each element of Cr, Cu are limited the quantity of:
C makes a significant impact the intensity of steel, low-temperature impact toughness, welding property.Based on its solution strengthening mechanism or the effect that improves hardening capacity, C can effectively improve armor plate strength, but along with the increasing of C content, low-temperature impact toughness, corrosion resistance nature, welding property can decrease.Especially after C is higher than 0.16%, occur the hardened structure of volume in welded heat affecting zone, toughness is worsened, and easily produce welding crack during high C, weldability is difficult to meet site welding requirement.C content of the present invention is limited in 0.012～0.16%.
The content of Mn of the present invention is limited in 1.20～1.50%.Mn mainly plays solution strengthening effect, puies forward the tensile strength that high Mn content can significantly improve steel, and manganese can also be postponed ferrite, pearlitic transformation, and reduces the transition temperature of bainite, is conducive to form fine grain structure, improves the erosion resistance of material; But when Mn content is higher, easily cause the segregation of thick steel plates.
S is as impurity element, is very easily combined with Mn to generate MnS and be mingled with, and significantly reduces low-temperature flexibility and the plasticity of steel plate, so the present invention reduces S constituent content as far as possible, takes into account smelting economy simultaneously, and S content is limited in below 0.005%.
The content of P of the present invention is P≤0.015%, and P significantly worsens plasticity and toughness and the welding of material, but P can increase substantially the erosion resistance of steel.
Si adds as deoxidant element often in smelting, and Si also can improve the intensity of material by solution strengthening mechanism in addition, and too high Si can reduce toughness and the weldability of material, so the present invention limits Si content 0.20～0.40%.
Al is also deoxidant element, and the AlN forming in steel is crystal grain thinning effectively simultaneously, and content 0.020%～0.060% is comparatively suitable.
Ti chemically reactive is very strong, and the C in Yi Yugang, N, O, S form compound.Add trace Ti, make the N in itself and steel form TiN, can anchoring austenite grain boundary and promote bainite forming core to suppress growing up of crystal grain in Plate Welding process, the toughness of welded heat affecting zone.
Ni content of the present invention is restricted to 0.12～0.30%.Ni can improve hardening capacity, therefore can play certain strengthening effect, and Ni is also unique alloying element that can simultaneously improve the strength of materials and toughness.Ni can also effectively stop the hot-short check crack causing of Cu.In add-on, 0.10% when above, Ni can significantly improve the weather resistance of steel, but content is unsuitable too high, otherwise can cause that billet oxidization iron sheet is difficult to remove, and reduces plate surface quality.
Cr is the important element that improves hardening capacity, and a certain amount of Cr can also make steel plate obtain good weather resistance.In the situation that Cu-Cr-Ni meets interpolation, Cr contributes to improve hardening capacity and weather resistance.Consider that the present invention does not add Mo alloy, for proof strength and weathering resistance the present invention are restricted to 0.40～0.60% by Cr content.
Cu itself can improve the intensity of material by ageing strengthening mechanism, can improve the weathering resistance of material simultaneously, but Copper Bearing Steel has certain red brittleness, for this reason, with reference to Ni content situation, for guaranteeing Ni/Cu=0.8-1.2, the present invention is limited to 0.15～0.40% by Cu content.
By above-mentioned analysis, the present invention adds Cr-Ni-Cu by composite economy, increases the hardening capacity of material when guaranteeing good corrosion resistance, obtains the steel plate with higher-strength and good corrosion resistance.Meanwhile, by controlling C on Composition Design
eqand P
cm, improved the weldability of steel plate.Beneficial effect outstanding behaviours of the present invention exists:
1, cost of alloy is cheap, does not adopt the alloys such as valuable Mo, Nb, only adopts the Cr-Ni-Cu that guarantees corrosion resistance nature, by element economy, add and kind few principle of trying one's best, rationally adjust the proportional quantity of each element, guarantee the various functions index of steel plate, reduce production cost.
2, do not add B element, avoided the impact of B on welded heat affecting zone hardness and mother metal stability, guaranteed the Large Heat Input Welding performance of steel plate.
3, excellent weldability, has realized the organic unity of steel plate highly corrosion resistant, high strength, high tenacity and superior weldability, low P
cm, C
eqvalue can guarantee low-temperature prewarming or not pre-thermo-welding.
Accompanying drawing explanation
Fig. 1 is embodiment 2 light plate metallographic structures;
Fig. 2 is embodiment 3 light plate impact fracture patterns (SEM).
Fig. 3 is embodiment 4 welding joint heat affected zone coarse grain zone microstructures (TEM)
Embodiment
With embodiment, by reference to the accompanying drawings the present invention is described in more detail below.In embodiment, all steel plates are all produced according to following technical process:
A kind of 800MPa Economic corrosion-resistant high tensile steel plate, its main chemical compositions weight percent is: C:0.12～0.16%, Si:0.20～0.40%, Mn:1.20～1.50%, P≤0.015%, S≤0.005%, Al:0.015～0.060%, Ti:0.015～0.040%, Ni:0.12～0.30%, Cr:0.40～0.60%, Cu:0.15～0.40, all the other are Fe and inevitable impurity.
The chemical composition of steel also meets carbon equivalent and welding crack sensibility coefficient requires:
Carbon equivalent:
C
eq=C+Mn/6+（Cr+Mo+V）/5+（Cu/+Ni）/15≤0.52%
Welding crack sensibility coefficient:
P
cm＝C+Si/30+Ni/60+(Mn+Cr+Cu)/20+Mo/15+V/10+5B≤0.28%。
The thickness of steel plate is 8～50mm.
Concrete steps are:
A.KR molten iron is processed: massfraction≤0.002% that makes sulphur by the pre-desulfurization of KR;
B. white silk is blown in converter: in converter region by top blast or push up the low compound white silk that blows;
C.LF stove refining: LF refining stage carries out trimming, makes C
eq≤ 0.52% and P
cm≤ 0.28%;
D.RH refining: RH refining stage deep desulfuration makes massfraction≤0.005% of sulphur, reduce the content of oxygen, hydrogen, nitrogen, make oxygen content≤0.0030%, hydrogen content≤0.0002%, a nitrogen content≤0.0040 %, and the inclusion that cannot remove is carried out to nodularization morphology Control;
E: sheet billet continuous casting: the continuous casting stage is by induction stirring and the weak cold control of bending section;
F: heating phase: heating steel billet to 1180～1250 ℃, insulation 8-12min/mm;
G: roughing, finish rolling stage: at austenite, recrystallization zone can occur billet rolling is become to intermediate blank, guarantee this percentage pass reduction >=15%, refine austenite crystal grain stage Mo; At austenite non-recrystallization, start finish rolling, at austenite, before bainite transformation, be rolled into steel plate, final rolling temperature is controlled at 900 ℃～Ar3+80 ℃, and cumulative deformation >=65% makes extreme trace time last pass deformation rate 20～25%;
H: quench treatment, temper stage: roll rear steel plate stacking slow cooling to room temperature, obtain the tiny normalizing rolling tissue of homogeneous microstructure; Steel plate after rolling is carried out to quench treatment, holding temperature Ac3+30～60 ℃, soaking time is 2min/mm+0～10min; Steel plate after quenching is carried out to 580 ℃～650 ℃ high temperings, and soaking time is 1.5～2.5min/mm+0～10min.
Embodiment 1: according to above technical process, in 210t converter, smelt, and cast at 250mm continuous caster, continuously cast bloom placement is checked to cleaning surface after 48 hours, process furnace heating 4.5 hours, soaking zone temperature is 1220 ℃, in recrystallization zone, continuous casting billet milling is become to intermediate blank, treat that temperature is to the rolling of 950 ℃ of beginning subordinate phase, finishing temperature is 860 ℃.Steel plate slow cooling, to normal temperature, enters quenching furnance insulation 30min, and soaking temperature is 910 ℃, is quenched to subsequently room temperature, and temper temperature is 650 ℃, after insulation 30min, comes out of the stove, and slow cooling is to normal temperature.
Embodiment 2: embodiment is with example 1, and wherein process furnace soaking zone temperature is 1200 ℃, and subordinate phase rolling start rolling temperature is 950 ℃, and finishing temperature is 880 ℃, and quenching soaking temperature is 908 ℃, and temper temperature is 640 ℃.Fig. 1 is this embodiment steel plate metallographic structure photo, can find out that steel plate is organized as typical tempered structure, and fine microstructures is even.
Embodiment 3: embodiment is with example 1, wherein process furnace soaking zone temperature is 1190 ℃, subordinate phase rolling start rolling temperature is 920 ℃, finishing temperature is 900 ℃, quenching soaking temperature is 915 ℃, and temper temperature is 620 ℃, after insulation 36min, comes out of the stove, slow cooling is to normal temperature, and this this example steel plate impact fracture of Fig. 2 scans pattern.From SEM fracture, observe, impact specimen fracture is tough break, illustrates that the low-temperature flexibility of steel plate is good.
Embodiment 4: embodiment is with example 1, and wherein process furnace soaking zone temperature is 1240 ℃, and subordinate phase rolling start rolling temperature is 915 ℃, finishing temperature is 900 ℃, and quenching soaking temperature is 920 ℃, and temper temperature is 620 ℃, after insulation 40min, come out of the stove, slow cooling is to normal temperature.This embodiment has been carried out to welding procedure qualification test, adopted after 15kJ/cm and the welding of 25kJ/cm weld heat input, according to JB4708-2000, required processing sample and check.Stretching, impact, cold bending test the results are shown in Table 3, and from table 3, steel plate, after adopting different heat input welding, is compared mechanical performance index with mother metal and obviously do not declined.Welded heat affecting zone coarse grain zone microstructure is shown in Fig. 3, and steel plate hot zone of influence coarse grain zone microstructure is ferrite bainite tissue.
Embodiment 5: embodiment is with example 1, and wherein process furnace soaking zone temperature is 1230 ℃, and subordinate phase rolling start rolling temperature is 910 ℃, finishing temperature is 900 ℃, and quenching soaking temperature is 900 ℃, and temper temperature is 610 ℃, after insulation 50min, come out of the stove, slow cooling is to normal temperature.Test, at steel plate head, middle part, afterbody, intensity and low-temperature flexibility check are carried out in wide two the limit portions of plate, two 1/4 places and the sampling of 1/2 place.Assay is in Table 4.Test-results shows that each position performance of invention steel plate is even.
Embodiment 6: embodiment is with example 1, and wherein process furnace soaking zone temperature is 1210 ℃, and subordinate phase rolling start rolling temperature is 910 ℃, finishing temperature is 900 ℃, and quenching soaking temperature is 912 ℃, and temper temperature is 580 ℃, after insulation 80min, come out of the stove, slow cooling is to normal temperature.
The metallurgical analysis of embodiment 1-6 change into minute and corrosion resistance index in Table 1.
The mechanical property detected result of embodiment 1-6 is in Table 2.
Claims (4)
1. a manufacture method for 800MPa Economic corrosion-resistant high tensile steel plate, comprises the following steps:
A.KR molten iron is processed: massfraction≤0.002% that makes sulphur by the pre-desulfurization of KR;
B. bessemerize: in converter region, pass through top blast or top bottom blowing;
C.LF stove refining: LF refining stage carries out trimming, makes C
eq≤ 0.52% and P
cm≤ 0.28%;
D.RH refining: RH refining stage deep desulfuration makes massfraction≤0.005% of sulphur, reduce the content of oxygen, hydrogen, nitrogen, make oxygen content≤0.0030%, hydrogen content≤0.0002%, a nitrogen content≤0.0040 %, and the inclusion that cannot remove is carried out to nodularization morphology Control;
E. sheet billet continuous casting: the continuous casting stage is by induction stirring and the weak cold control of bending section;
F. heating phase: heating steel billet to 1180～1250 ℃, insulation 8-12min/mm;
G. roughing, finish rolling stage: at austenite, recrystallization zone can occur billet rolling is become to intermediate blank, guarantee this percentage pass reduction >=15%, refine austenite crystal grain stage Mo; At austenite non-recrystallization, start finish rolling, at austenite, before bainite transformation, be rolled into steel plate, final rolling temperature is controlled at 900 ℃～Ar3+80 ℃, and cumulative deformation >=65% makes extreme trace time last pass deformation rate 20～25%;
H. quench treatment, temper stage: roll rear steel plate stacking slow cooling to room temperature, obtain the tiny normalizing rolling tissue of homogeneous microstructure; Steel plate after rolling is carried out to quench treatment, holding temperature Ac3+30～60 ℃, soaking time is 2min/mm+0～10min; Steel plate after quenching is carried out to 580 ℃～650 ℃ high temperings, and soaking time is 1.5～2.5min/mm+0～10min;
Above-mentioned after step h resulting steel plate, its chemical composition comprises by weight percentage: C:0.12～0.16%, Si:0.20～0.40%, Mn:1.20～1.50%, P≤0.015%, S≤0.005%, Al:0.015～0.060%, Ti:0.015-0.040%, Ni:0.12～0.30%, Cr:0.40～0.60%, Cu:0.15～0.40%, all the other are Fe and inevitable impurity.
2. the manufacture method of a kind of 800MPa Economic corrosion-resistant high tensile steel plate according to claim 1, is characterized in that: described after step h resulting steel plate chemical composition meet carbon equivalent and the requirement of welding crack sensibility coefficient:
C
eq=C+Mn/6+（Cr+Mo+V）/5+（Cu/+Ni）/15≤0.52%。
3. the manufacture method of a kind of 800MPa Economic corrosion-resistant high tensile steel plate according to claim 1 and 2, is characterized in that: described after step h resulting steel plate chemical composition meet the requirement of welding crack sensibility coefficient:
P
cm＝C+Si/30+Ni/60+(Mn+Cr+Cu)/20+Mo/15+V/10+5B≤0.28%。
4. the manufacture method of a kind of 800MPa Economic corrosion-resistant high tensile steel plate according to claim 1 and 2, is characterized in that: described after step h resulting steel plate thickness be 8～50mm.
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| CN110499466A (en) * | 2019-09-02 | 2019-11-26 | 河钢股份有限公司 | Yield strength 550MPa grade nickel-saving type high-strength weathering steel and its production method |
| CN111299533A (en) * | 2020-04-03 | 2020-06-19 | 武汉钢铁有限公司 | Method for improving castability of ultra-low carbon steel produced by billet continuous casting machine |
| WO2022104676A1 (en) * | 2020-11-20 | 2022-05-27 | 何满潮 | Production method for npr new material slab by means of converter and continuous casting |
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| JP3466076B2 (en) * | 1998-02-27 | 2003-11-10 | 株式会社神戸製鋼所 | Steel with excellent corrosion resistance and weldability |
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| CN1639371A (en) * | 2002-02-27 | 2005-07-13 | 新日本制铁株式会社 | Atmosphere corrosion resisting steel plate having high strength and excellent bending formability and method for production thereof |
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