CN104498836A - Corrosion-resistant rare earth alloy steel - Google Patents
Corrosion-resistant rare earth alloy steel Download PDFInfo
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- 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
Abstract
The invention discloses a corrosion-resistant rare earth alloy steel, relating to the field of rare earth alloy steel. The rare earth alloy steel comprises the following components in percentage by mass: 0%-0.10% of C, 0.20%-0.50% of Si, 0.40%-0.60% of Mn, 0%-0.018% of P, 0%-0.005% of S, 1.8%-2.0% of Cr, 0%-0.3% of Ni, 0.30%-0.50% of Mo, 0.04%-0.08% of Al, 0.08%-0.12% of V, 0.04%-0.08% of Nb, 0%-0.20% of Cu, 0.005%-0.03% of rare earth and the balance of Fe. The rare earth comprises 20%-40% of La, 40%-50% of Ce, 15%-20% of Nd and 1%-5% of Pr. On the premise of having favorable strength, toughness, high temperature resistance and weldability, the rare earth alloy steel has higher hydrogen sulfide stress corrosion resistance, hydrogen-induced cracking resistance, chlorine ion corrosion resistance and lower use cost.
Description
Technical field
The present invention relates to rare earth alloy steel field, be specifically related to a kind of corrosion-proof rare earth steel alloy.
Background technology
There is Wet H2S environment (H in the Pressure vessels in existing petrochemical industry
2and chlorion (Cl S)
-) corrosive conditions, therefore, petrochemical equipment needs to adopt corrosion resistant steel to make, traditional petrochemical equipment corrosion-resistant steel adopts that the trade mark is Q345R (HIC), the carbon steel of Q245R (HIC) or SA516Gr.70 (HIC) is made usually, and the alloy content of carbon steel is lower, and intensity is lower, easily impaired under high-temperature and high-pressure conditions, Steel for Petrochemicai Equipment after impaired is difficult to reuse, and needs to change, and use cost is higher.
Therefore, existing Steel for Petrochemicai Equipment adopts the trade mark to be 12Cr2Mo1R in facing in hydrogen environment of middle high temperature usually, 12Cr2Mo1VR, or the hydrogen steel plate that faces of 15CrMoR (H) is made, this faces hydrogen steel plate in use, the High Temperature High Pressure in equipment use process can be born, but be in the environment of moist hydrogen sulfide and chlorion for a long time, hydrogen sulfide and chlorion can be mutually promoted and be aggravated corrosion, cause facing hydrogen steel plate generation sulphide stress corrosion and chlorion stress corrosion, hydrogen steel plate intensity of facing after corrosion reduces, in equipment use process, easily there is breakage in the hydrogen steel plate that faces after corrosion, be difficult to continue to use.
The patent No. is that the patent of invention of CN102925814A discloses " a kind of anti-H 2 S stress corrosion steels for pressure vessel use and production method thereof ", by controlling S, P content in steel, steel are made to have good resistance against hydrogen cracking and anti-H 2 S stress corrosion performance, but the tensile strength of this steel plate is lower, resistance toheat is not strong, is not suitable for the petrochemical equipment of middle hot environment, and when for high pressure petrochemical equipment, need the steel plate using thickness larger, use cost is higher.
The patent No. is that the application for a patent for invention of CN102605242A discloses " a kind of resistance against hydrogen cracking steels for pressure vessel use and manufacture method thereof " by increasing C content to 0.15% ~ 0.25% in steel, increases the intensity of steel; But along with the increase of carbon content, steel not only easily hydrogen attack occur, and weldability is poor, therefore, these steel are difficult to use in the pressurized vessel preparing petrochemical equipment.
Summary of the invention
For the defect existed in prior art, the object of the present invention is to provide a kind of corrosion-proof rare earth steel alloy, under the prerequisite with good obdurability, high thermal resistance, welding property, the anti-H 2 S stress corrosion ability of raising steel, resistant to hydrogen cause ability and the anti-chlorine ion corrosion ability of induced cracking, and use cost is lower.
For reaching above object, the technical scheme that the present invention takes is: a kind of corrosion-proof rare earth steel alloy, by mass percentage, this rare earth alloy steel comprises the C of 0% ~ 0.10%, the Si of 0.20% ~ 0.50%, the Mn of 0.40% ~ 0.60%, the P of 0% ~ 0.018%, the S of 0% ~ 0.005%, the Cr of 1.8% ~ 2.0%, the Ni of 0% ~ 0.3%, the Mo of 0.30% ~ 0.50%, the Al of 0.04% ~ 0.08%, the V of 0.08% ~ 0.12%, the Nb of 0.04% ~ 0.08%, the Cu of 0% ~ 0.20%, the rare earth of 0.005% ~ 0.03%, surplus is Fe, rare earth comprises the La of 20% ~ 40%, the Ce of 40% ~ 50%, the Nd of 15% ~ the 20% and Pr of 1% ~ 5%.
On the basis of technique scheme, by mass parts, described rare earth alloy steel comprises the C of 0% ~ 0.08%, the Si of 0.25% ~ 0.45%, the Mn of 0.42% ~ 0.55%, the P of 0% ~ 0.014%, the S of 0% ~ 0.0035%, the Cr of 1.82% ~ 1.98%, the Ni of 0% ~ 0.2%, the Mo of 0.32% ~ 0.48%, the Al of 0.05% ~ 0.07%, the V of 0.09% ~ 0.11%, the Nb of 0.05% ~ 0.07%, the Cu of 0% ~ 0.15%, the rare earth of 0.007% ~ 0.020%, surplus is Fe, rare earth comprises the La of 20% ~ 40%, the Ce of 40% ~ 50%, the Nd of 15% ~ the 20% and Pr of 1% ~ 5%.
On the basis of technique scheme, by mass parts, described rare earth alloy steel comprises the C of 0% ~ 0.05%, the Si of 0.30% ~ 0.40%, the Mn of 0.45% ~ 0.52%, the P of 0% ~ 0.012%, the S of 0% ~ 0.003%, the Cr of 1.85% ~ 1.95%, the Ni of 0% ~ 0.15%, the Mo of 0.35% ~ 0.45%, the Al of 0.055% ~ 0.65%, the V of 0.095% ~ 0.105%, the Nb of 0.055% ~ 0.065%, the Cu of 0% ~ 0.10%, the rare earth of 0.008% ~ 0.015%, surplus is Fe, rare earth comprises the La of 20% ~ 40%, the Ce of 40% ~ 50%, the Nd of 15% ~ the 20% and Pr of 1% ~ 5%.
On the basis of technique scheme, the content of described rare earth alloy steel middle-weight rare earths is 0.01%.
On the basis of technique scheme, described rare earth comprises La, the Ce of 48% of 30%, the Pr of the Nd of 19% and 3%.
On the basis of technique scheme, the yield strength of described rare earth alloy steel is 380 ~ 390MPa, and tensile strength is 540 ~ 565MPa.
On the basis of technique scheme, the relative reduction in area of described rare earth alloy steel is 63% ~ 65%, and elongation after fracture is 31% ~ 32%, and elongation is 34.5%.
On the basis of technique scheme, described grain fineness number is greater than 6 grades, and the summation of nonmetallic impurity is less than 4.0.
On the basis of technique scheme, the ballistic work of described rare earth alloy steel at 0 DEG C be 228J, ballistic work at-30 DEG C is 205J.
Prepare a method for corrosion-proof rare earth steel alloy, comprise the following steps:
A, starting material are put into electric furnace refine, obtain molten steel; Molten steel is transferred to external refining bag and carries out external refining and vacuum outgas, the content adjusting C in ladle is 0% ~ 0.10%, the content of Si is 0.20% ~ 0.50%, the content of Mn is 0.40% ~ 0.60%, the content 0% ~ 0.018% of P, the content 0% ~ 0.005% of S, the content of Cr is 1.8% ~ 2.0%, the content 0% ~ 0.3% of Ni, the content of Mo is 0.30% ~ 0.50%, the content of Al is 0.04 ~ 0.08%, the content of V is 0.08 ~ 0.12%, the content of Nb is the content 0% ~ 0.2% of 0.04 ~ 0.08%, Cu;
B, bull ladle casting die casting obtains electrode billet, electrode billet is carried out esr, obtain rare earth alloy steel electroslag ingot, nearly finished product is obtained by after electroslag ingot hot-work, roughing, nearly finished product is carry out 700 ± 10 DEG C of temper after 950 ± 10 DEG C of normalizing treatment through temperature, then obtains rare earth alloy steel finished product through precision work.
Compared with prior art, the invention has the advantages that:
(1) rare earth alloy steel in the present invention, its yield strength is 380 ~ 390MPa, tensile strength is 540 ~ 565MPa, relative reduction in area is 63 ~ 65%, elongation after fracture is 31 ~ 32%, and grain fineness number is greater than 6 grades, and the summation of nonmetallic impurity is less than 4.0, ballistic work at 0 DEG C is 228J, ballistic work at-30 DEG C is 205J, and the elongation of this steel alloy is 34.5%.Rare earth alloy steel of the present invention, compared with steel of the prior art, its comprehensive comparison is superior, not easily damaged at high temperature under high pressure, can be used in preparing Steel for Petrochemicai Equipment.Meanwhile, when Steel for Petrochemicai Equipment prepared by this rare earth alloy steel, not only weldability is higher, and the thinner thickness of the rare earth alloy steel needed, can be cost-saving.
(2) rare earth alloy steel in the present invention, its resistance to sulfuric acid, iron trichloride, hydrochloric acid, the uniform corrosion ability of hydrogen sulfide is stronger, because the comparison of ingredients of petroleum and chemical industry raw material is complicated, usually containing sulfide, hydrogen, Wet H2S environment and chlorion, if Steel for Petrochemicai Equipment is corroded by wherein any one composition, structure deteriorate can be caused, therefore, need to select to prevent the steel that any one composition corrodes from preparing Steel for Petrochemicai Equipment, rare earth alloy steel in the present invention can meet above-mentioned requirements, therefore, rare earth alloy steel can be used in preparing can the Steel for Petrochemicai Equipment of life-time service, extend the work-ing life of Steel for Petrochemicai Equipment, reduce the use cost of Steel for Petrochemicai Equipment.
(3) rare earth alloy steel in the present invention, through normalizing at the temperature of 950 ± 10 DEG C, obtain after tempering at the temperature of 700 ± 10 DEG C, this rare earth alloy steel is organized as stable ferrite+sorbite tissue, there is not martensitic stucture hydrogen sulfide splitting and hydrogen induced cracking (HIC) being had to considerable influence, and then increase the anti-H 2 S stress corrosion ability of rare earth alloy steel.
Accompanying drawing explanation
Fig. 1 is the metallograph of corrosion-proof rare earth steel alloy in the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Shown in Figure 1, the embodiment of the present invention provides a kind of corrosion-proof rare earth steel alloy, by mass percentage, this rare earth alloy steel comprises the C (carbon) of 0% ~ 0.10%, the Si (silicon) of 0.20% ~ 0.50%, the Mn (manganese) of 0.40% ~ 0.60%, the P (phosphorus) of 0% ~ 0.018%, the S (sulphur) of 0% ~ 0.005%, the Cr (chromium) of 1.8% ~ 2.0%, the Ni (nickel) of 0% ~ 0.3%, the Mo (molybdenum) of 0.30% ~ 0.50%, the Al (aluminium) of 0.04% ~ 0.08%, the V (vanadium) of 0.08% ~ 0.12%, the Nb (niobium) of 0.04% ~ 0.08%, the Cu (copper) of 0% ~ 0.20%, the rare earth of 0.005% ~ 0.03% is (in the present embodiment, the content of rare earth is preferably 0.01%), surplus is Fe (iron) and inevitable impurity.
In the embodiment of the present invention, by mass parts, corrosion-proof rare earth steel alloy comprises the C of 0% ~ 0.08%, the Si of 0.25% ~ 0.45%, the Mn of 0.42% ~ 0.55%, the P of 0% ~ 0.014%, the S of 0% ~ 0.0035%, the Cr of 1.82% ~ 1.98%, the Ni of 0% ~ 0.2%, the Mo of 0.32% ~ 0.48%, the Al of 0.05% ~ 0.07%, the V of 0.09% ~ 0.11%, the Nb of 0.05% ~ 0.07%, the Cu of 0% ~ 0.15%, the rare earth of 0.007% ~ 0.020%, surplus is Fe and inevitable impurity.
In the embodiment of the present invention, by mass parts, corrosion-proof rare earth steel alloy comprises the C of 0% ~ 0.05%, the Si of 0.30% ~ 0.40%, the Mn of 0.45% ~ 0.52%, the P of 0% ~ 0.012%, the S of 0% ~ 0.003%, the Cr of 1.85% ~ 1.95%, the Ni of 0% ~ 0.15%, the Mo of 0.35% ~ 0.45%, the Al of 0.055% ~ 0.65%, the V of 0.095% ~ 0.105%, the Nb of 0.055% ~ 0.065%, the Cu of 0% ~ 0.10%, the rare earth of 0.008% ~ 0.015%, surplus is Fe and inevitable impurity.
20% ~ 40%La (lanthanum) that rare earth in the embodiment of the present invention comprises, the Ce (cerium) of 40% ~ 50%, 15% ~ 20% the Pr (praseodymium) of Nd (neodymium) and 1% ~ 5%.
In the embodiment of the present invention, rare earth comprises La, the Ce of 48% of 30%, the Pr of the Nd of 19% and 3%.
The preparation method of embodiment of the present invention middle-weight rare earths steel alloy is as follows:
S1: add Fe in electric furnace with eccentric bottom, the Al first adding mass parts 0% ~ 0.01% during tapping carries out preliminary deoxidation, then adds Si, Mn, Cr, Mo, Ni, V, Nb element and carries out preliminary alloying, obtain molten steel.
S2: molten steel is transferred to external refining bag and carries out LF external refining and vacuum outgas, the content adding aluminium in aluminium to steel in degassed backward steel is 0.05% ~ 0.08%, adding rare earth again keeps little argon gas to stir more than 15min, in adjustment ladle, the content of C is 0% ~ 0.10%, the content of Si is 0.20% ~ 0.50%, the content of Mn is 0.40% ~ 0.60%, the content 0% ~ 0.018% of P, the content 0% ~ 0.005% of S, the content of Cr is 1.8% ~ 2.0%, the content 0% ~ 0.3% of Ni, the content of Mo is 0.30% ~ 0.50%, the content of Al is 0.04 ~ 0.08%, the content of V is 0.08 ~ 0.12%, the content of Nb is 0.04 ~ 0.08%, the content 0% ~ 0.2% of Cu.
S3: bull ladle casting die casting obtains electrode billet, electrode billet is carried out esr, obtain rare earth alloy steel electroslag ingot, nearly finished product is obtained by after electroslag ingot hot-work, roughing, nearly finished product is carry out 700 ± 10 DEG C of temper after 950 ± 10 DEG C of normalizing treatment through temperature, then obtains rare earth alloy steel finished product through precision work.
Shown in Figure 1, rare earth alloy steel finished product be organized as stable ferrite+sorbite tissue, in figure, white is ferritic structure, there is not martensitic stucture hydrogen sulfide splitting and hydrogen induced cracking (HIC) being had to considerable influence, and then increase the anti-H 2 S stress corrosion ability of rare earth alloy steel finished product.
Adopt the rare earth alloy steel that aforesaid method is obtained, its tensile strength is 540 ~ 565MPa, and yield strength is 380 ~ 390MPa, relative reduction in area is 63% ~ 65%, elongation after fracture is 31% ~ 32%, and grain fineness number is greater than 6 grades, and the summation of nonmetallic impurity is less than 4.0.
In embodiment of the present invention Medium Alloy Steel, the content of carbon is 0% ~ 0.10%, due to carbon content be 0.08% ~ 0.25% time, the halophile corrodibility of steel alloy is higher, if carbon content is higher than after 0.25%, along with the increase of carbon content in steel alloy, not only easily there is hydrogen attack in steel alloy, and weldability is poor, the carbon content of embodiment of the present invention Medium Alloy Steel is for controlling below 0.10%, and this steel alloy can not only corrode by halophile, and weldability is better.
In the embodiment of the present invention, the content of Mn is 0.40% ~ 0.60%, due to the element that manganese element is a kind of easy segregation, controlling Fe content is the effective way avoiding steel alloy to ftracture at sulfide corrosion, when the Mn of line of segragation, C content reach certain proportion, produce at steel and in equipment welding process, easily produce martensitic phase.The hardness of martensitic phase is higher, can reduce the ability of equipment resisting sulfide stress corrosion; Meanwhile, when in steel alloy, the content of manganese is 0.40% ~ 0.60%, manganese can produce manganese sulfide with the reaction of Salmon-Saxl in steel alloy, discharges steel alloy system.Meanwhile, steel alloy is when deoxidation, and content is the manganese of 0.40% ~ 0.60%, can form good deoxidation tissue, promotes steel alloy deoxidation, and has a positive effect.
In the embodiment of the present invention, the content of Cr is 1.8% ~ 2.0%, the fusing point of Cr is 1903 DEG C, itself there is good creep-resistant property, when in steel alloy, the content of Cr is 1.8% ~ 2.0%, this steel alloy has good creep-resistant property, when Cr in steel alloy content lower than 1.8% or higher than 2.0% time, its creep-resistant property is all the steel alloy of 1.8% ~ 2.0% lower than Cr content.
Chromium, aluminium, silicon and rare earth element can improve the antioxidant property of high temperature steel.
In the embodiment of the present invention, the content of Mo is 0.30% ~ 0.50%, the fusing point of Mo is 2625 DEG C, it is a kind of refractory metal, after Mo adds steel alloy, γ-Fe phase region can be reduced, expand the alloying element (γ-Fe, α-Fe are the different configurations of iron elemental crystal) of α-Fe phase region, resistant to hydrogen ability and anti-H 2 S cracking performance can be improved, improve the heat resistance of high temperature steel, significantly suppress the self-diffusion of iron, improve the recrystallization temperature of sosoloid.At the content of Mo comparatively in Mayari, the effect of Mo is Intensive intervention part and the tiny Carbide Phases forming excellent.The anti-H 2 S cracking effect of Mo is equivalent to 4 times of chromium, when the content of Mo is 0.3% ~ 0.5%, not only have good anti-H 2 S cracking performance, and use cost is lower.
The content of Al is 0.04% ~ 0.08%, and because Al is the main deoxidant element in steel alloy, the maxima solubility of Al in austenite is only faintly can increase hardening capacity after 0.6%, Al dissolves in austenite; When the content of Al is higher in steel alloy, can causes in steel alloy to be mingled with and increase, and then the toughness of reduction steel alloy, hardenability and hydrogen sulfide corrosion resistance energy.When in steel alloy, the content of Al is 0.04% ~ 0.08%, Al can incorporate in austenite completely, can not only increase austenitic hardening capacity, and keeps the hydrogen sulfide corrosion resistance energy of steel alloy.
Ni is the principal element impelling steel alloy to form stable austenite tissue, and the critical temperature starting to separate out F when iron-carbon can be made to cool in austenite is minimum, meanwhile, makes the increase of cold crack sensitivity coefficient minimum.Ni content 0% ~ 0.3% time, can coexist with Ni and the Nb in steel alloy, V, the transformation temperature of steel alloy be reduced, impels the formation of fine precipitates, reduce steel alloy refining cost.The content 0% ~ 0.3% of Ni, can prevent the suction hydrogen that Ni too high levels causes, and then effectively can reduce the sulfide fracture sensitivity of steel alloy.
The content of Nb be 0.04% ~ 0.08%, Nb can refining alloy steel crystal grain, reduce the superheated susceptivity of steel alloy, reduce the temper brittleness of steel alloy, improve the intensity of steel alloy.
Nb can the normalizing of refining alloy steel and the Main Tissues ferrite of annealing, increase the ferritic resistance to deformation of high temperature, the distortion (especially the distortion of MnS) of inclusion during rolling, along with the increase of content of niobium, the long-width ratio of MnS increases, and the susceptibility of HIC (anti-hydrogen induced cracking) increases.When content of niobium is less than 0.037%, Nb (CN) particle is very tiny, and now HIC crackle mainly appears at elongated MnS top, decreases the ununiformity of ferritic structure, effectively improves the performance of steel resisting sulfide corrosion.
V is the excellent reductor of steel, and vanadium can fining ferrite grains, improves intensity and the toughness of steel alloy.Vanadium can form carbide with carbon, and under the condition of High Temperature High Pressure, carbide can improve resistant to hydrogen corrosive power, and (iron-carbon solidifies and the Fe separated out during cooling transformation by metastable equilibrium system to improve cementite
3c type carbide) fusing point, hardness and wear resistance.During the too high levels of V, easily make the weld of steel alloy produce fragility, therefore the content of V can not be too high, controls 0.08% ~ 0.12%.
Cu can form protective membrane in steel, and protective membrane can hinder hydrogen atom to spread in steel, and then improves the resistance against hydrogen cracking performance of steel; During copper too high levels, during hot-work, steel alloy easily produces hot-short, and therefore the content of copper can not be too high, controls less than 0.2%.
Rare earth can crystal grain thinning, and under controlled rolling, appropriate rare earth can make rolling state steel be granular bainite microstructure.In austenitic area, the incubation period that rare earth makes niobium carbide separate out extends, and makes beginning and the finish-time interval increasing of dynamic recrystallization.The arsenic impurities, antimony etc. of rare earth and low melting point are combined to high melting compound and are dissolved in ferrite, purification crystal boundary, and then reduce boundary defect, contribute to alleviating hydrogen sulfide corrosion.Rare earth also has fabulous sulphur removal.
Rare earth is added in steel, the oxygen in the inclusiones such as silicate, aluminum oxide, aluminium chlorhydrate and the manganese sulfide existed in steel and sulphur can be replaced, form rare earth compound, rare earth compound is not yielding when hot-work, still tiny spherical or fusiform is kept, comparatively be evenly distributed in steel, eliminate original being mingled with in strip MnS etc. along Steel Rolling directional spreding existed, realize the effective control to inclusion morphology.
Rare earth has the process of a gradual change with the increase of content to the Denaturation of inclusion.Containing a small amount of rare earth in steel, steel just can be observed the MnS containing rare earth that is thicker, that shortened, continue to increase with rare earth composition, increase gradually containing spherical rare-earth sulfide, and with inclusiones such as coccoid RES, when steel middle-weight rare earths reaches certain value, the just completely dissolve of strip MnS inclusion, the MnS inclusion of about more than 90% can become tiny spherical or imitative capitate particle, comparatively be uniformly distributed, elongate strip MnS can be overcome and be mingled with produced directivity, overcome the lamellar tearing of welded heat affecting zone.The thermal expansivity of re inclusion and the approximate of steel, produce larger additional stress when steel heat can be avoided to process cooling, improve the fatigue strength of steel around inclusion.Rare earth can suppress Austenite Grain Growth in steel, and tiny spherical rare-earth inclusion has pinning effect to crystal boundary, can hinder the migration of crystal boundary, thus inhibiting grain growth.
In the embodiment of the present invention, rare earth comprises the La of 20% ~ 40%, the Ce of 40% ~ 50%, the Nd of 15% ~ the 20% and Pr of 1% ~ 5%, effectively can control the state of inclusion shape, suppress Austenite Grain Growth in steel, make the crystal grain of the rare earth alloy steel obtained relatively more even, Performance Ratio is better.
S, P: sulphur and phosphorus are all the harmful elements in steel, S≤0.005% in the present embodiment, P≤0.018%, can improve the erosion resistance of rare earth alloy steel.
Below, by 7 embodiments, the present invention is elaborated:
Ginseng is shown in Table 1, and is the rare earth alloy steel that component is different.
Table 1, the content of each component in embodiment 1,2,3,4,5,6,7
Ginseng is shown in Table 2, and the yield strength of the rare earth alloy steel adopting the formula of embodiment 1 to obtain is 390MPa, and tensile strength is 540MPa, and relative reduction in area is 65%, and elongation after fracture is 32%.
The yield strength of the rare earth alloy steel adopting the formula of embodiment 2 to obtain is 380MPa, and tensile strength is 565MPa, and relative reduction in area is 63%, and elongation after fracture is 31%.
Table 2, the mechanical property of the steel alloy that embodiment 1,2 is made
Ginseng is shown in Table 3, sample 1 for the trade mark be the steel of 15Cr2AlMo rare earth, sample 2 for board be the steel of Q245R, sample 3 for the trade mark be the stainless steel of 304, sample 4 is the steel (hereinafter referred to as RE300) synthesized in the embodiment of the present invention.In table 3, the unit of average corrosion rate is mg/cm
2.h.
The contrast of table 3 embodiment of the present invention and other materials uniform corrosion performance
Under the condition of 35 DEG C, sample 1,2,3 and RE300 are put into the liquor ferri trichloridi that concentration is 6% respectively, deposits 24h and carry out immersion corrosion, the average corrosion rate obtaining RE300 is 2.36mg/cm
2.h, lower than other all samples.
Under the condition of 155 DEG C, rare earth alloy steel is put into the MgCl that concentration is 45%
2in solution, take out after carrying out the boiling immersion corrosion test of 72h, obtaining smooth surface, there is not the form such as pitting corrosion, knife line attack in the surface of rare earth alloy steel, is uniform corrosion, measures and obtains RE300 at MgCl
2in average corrosion rate be 0.062mg/cm
2.h, lower than sample 1,2, RE300, there is good anti-chlorine ion stress corrosion ability.
Temperature be 70 DEG C, concentration is the H of 50%
2sO
4in system, the erosion rate of RE300 is lower than sample 1,2,3.
Temperature be 80 DEG C, concentration is in the HCl system of 3%, temperature is 100 DEG C, concentration is the H of 1000ppm
2in S system, the erosion rate of RE300 is lower than sample 1,2,3.At H
2in S system, although the erosion rate of RE300 is higher than stainless steel 304, but, the cost of stainless steel 304 is higher, sulfuric acid corrosion resistant and iron trichloride corrosive power poor, there is stress corrosion harm simultaneously, because the comparison of ingredients of petroleum and chemical industry raw material is complicated, usually containing sulfide, hydrogen, Wet H2S environment and chlorion, if Steel for Petrochemicai Equipment is corroded by wherein any one composition, structure deteriorate can be caused, therefore, need to select to prevent the steel that any one composition corrodes from preparing Steel for Petrochemicai Equipment, RE300 in the embodiment of the present invention can meet above-mentioned requirements, therefore, RE300 can be used in preparing can the Steel for Petrochemicai Equipment of life-time service, extend the work-ing life of petrochemical equipment, reduce the use cost of petrochemical equipment.
HIC test performs according to GB/T8650-2006 " pipe line steel and steels for pressure vessel use resistance against hydrogen cracking assessment method ", and test(ing) medium is 5% glacial acetic acid+5% sodium chloride aqueous solution that hydrogen sulfide is saturated.SSCC (hydrogen sulfide splitting) test performs according to GB/T4157-2006 " metal is anti-special shape environmental cracking laboratory test in hydrogen-sulfide environmental ", and test(ing) medium is 5% glacial acetic acid+5% sodium chloride aqueous solution that hydrogen sulfide is saturated.
Table 4, the steel plate of the embodiment of the present invention and other materials hydrogen sulfide corrosion resistance can contrast
Ginseng is shown in Table 4, and sample 5,6,7 respectively corresponding thickness is the RE300 steel plate of 12mm, 24mm, 30mm, sample 8 and sample 9 for thickness be 20, steel grade rank is respectively the hydrogen sulfide corrosion resistant steel plate of Q245R, Q345R.
Sample 5,6,7 in the fabrication process, all adopts the technique of normalizing and tempering, and HIC test result is: do not occur hydrogen blistering situation, and crack length rate, crack thickness rate and crack-sensitivity rate are 0%; SSCC test result is 320MPa.
Sample 8 in the fabrication process, only adopts normalizing process, and HIC test result is: do not occur hydrogen blistering situation, and crack length rate is 3%, crack thickness rate is 1%, crack-sensitivity rate is 0%; SSCC test result is 247MPa.
Sample 9 in the fabrication process, only adopts normalizing process, and HIC test result is: do not occur hydrogen blistering situation, and crack length rate is 5%, crack thickness rate is 2%, crack-sensitivity rate is 2%; SSCC test result is 247MPa.
HIC and the SSCC result of sample 5,6,7 is all better than sample 8,9, and therefore, not only resistance against hydrogen cracking ability is comparatively strong but also anti-H 2 S stress corrosion cracking ability is stronger for the steel plate of the embodiment of the present invention.
Table 5, in the steel plate of the embodiment of the present invention and other materials, inclusion and grain fineness number contrast
Ginseng is shown in Table 5, and only containing a small amount of category-A and category-B inclusion in sample 5,6,7, not containing C class, D class and DS type impurity, and grain fineness number is 9 grades.
The grain fineness number of sample 8,9 is 8 grades, is less than 9.Category-A in sample 8,9 and the inclusion content of category-B are all greater than sample 5,6,7, and containing C class, D class and DS type impurity in sample 8, containing C type impurity in sample 9.
The steel plate of table 6 embodiment of the present invention and the stretching of other materials, impact property contrast
Ginseng is shown in Table 6, and thickness is the RE300 steel plate tensile strength at normal temperatures of 20mm is 540Mpa, and the tensile strength under 450 DEG C of conditions is 427Mpa, yield strength is 400Mpa, and elongation is the ballistic work at 32%, 0 DEG C is 230J, ballistic work at-30 DEG C is 192J, and hardness value is 143HB.
The hydrogen sulfide corrosion resistant steel plate that RE300 steel plate and thickness are 20mm, steel grade rank is respectively Q245R, Q345R, middle temperature steel plate of pressure vessel 15CrMoR compares, and the tensile strength under RE300 tensile strength at normal temperatures, 450 DEG C of conditions is higher; Meanwhile, the shock resistance weight bearing power of RE300 is stronger.
Table 7, the steel pipe of the embodiment of the present invention and the stretching of other materials, impact property contrast
Ginseng is shown in Table 7, the room temperature tensile strength of the special weldless steel tube 08Cr2AlMo of interchanger is 470Mpa, yield strength is 325Mpa, tensile strength is 326Mpa at 450 DEG C, elongation to be ballistic work at 31%, 0 DEG C be 93J, ballistic work at-30 DEG C be 42J, and hardness value is 112HB.
The room temperature tensile strength of weldless steel tube 10 (HSC) is 421Mpa, yield strength is 317Mpa, tensile strength is 265Mpa at 450 DEG C, elongation to be ballistic work at 32%, 0 DEG C be 82J, ballistic work at-30 DEG C be 38J, and hardness value is 118HB.
The RE300 steel pipe of the embodiment of the present invention, its room temperature tensile strength is 618Mpa, higher than 30% of 08Cr2AlMo and 10 (HSC); RE300 steel pipe tensile strength at 450 DEG C is 453Mpa, higher than 50% of 08Cr2AlMo and 10 (HSC).
The elongation of RE300 steel pipe is 34.5%, and higher than the elongation of 08Cr2AlMo and 10 (HSC), the distortion adaptability of RE300 steel pipe is better.
The ballistic work of RE300 steel pipe at 0 DEG C be 228J, ballistic work at-30 DEG C is 205J, far above the analog value of the special weldless steel tube 08Cr2AlMo of interchanger and weldless steel tube 10 (HSC), therefore the low-temperature impact toughness of RE300 steel pipe is far above the special weldless steel tube 08Cr2AlMo of interchanger and weldless steel tube 10 (HSC).
The hardness value of RE300 steel pipe is 148HB, and higher than the special weldless steel tube 08Cr2AlMo of interchanger and weldless steel tube 10 (HSC), therefore, the wear resistance of RE300 steel pipe is better.
The present invention is not limited to above-mentioned embodiment, and for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also considered as within protection scope of the present invention.The content be not described in detail in this specification sheets belongs to the known prior art of professional and technical personnel in the field.
Claims (10)
1. a corrosion-proof rare earth steel alloy, it is characterized in that: by mass percentage, this rare earth alloy steel comprises the C of 0% ~ 0.10%, the Si of 0.20% ~ 0.50%, the Mn of 0.40% ~ 0.60%, the P of 0% ~ 0.018%, the S of 0% ~ 0.005%, the Cr of 1.8% ~ 2.0%, the Ni of 0% ~ 0.3%, the Mo of 0.30% ~ 0.50%, the Al of 0.04% ~ 0.08%, the V of 0.08% ~ 0.12%, the Nb of 0.04% ~ 0.08%, the Cu of 0% ~ 0.20%, the rare earth of 0.005% ~ 0.03%, surplus is Fe, rare earth comprises the La of 20% ~ 40%, the Ce of 40% ~ 50%, the Nd of 15% ~ the 20% and Pr of 1% ~ 5%.
2. corrosion-proof rare earth steel alloy as claimed in claim 1, it is characterized in that: by mass parts, described rare earth alloy steel comprises the C of 0% ~ 0.08%, the Si of 0.25% ~ 0.45%, the Mn of 0.42% ~ 0.55%, the P of 0% ~ 0.014%, the S of 0% ~ 0.0035%, the Cr of 1.82% ~ 1.98%, the Ni of 0% ~ 0.2%, the Mo of 0.32% ~ 0.48%, the Al of 0.05% ~ 0.07%, the V of 0.09% ~ 0.11%, the Nb of 0.05% ~ 0.07%, the Cu of 0% ~ 0.15%, the rare earth of 0.007% ~ 0.020%, surplus is Fe, rare earth comprises the La of 20% ~ 40%, the Ce of 40% ~ 50%, the Nd of 15% ~ the 20% and Pr of 1% ~ 5%.
3. corrosion-proof rare earth steel alloy as claimed in claim 2, it is characterized in that: by mass parts, described rare earth alloy steel comprises the C of 0% ~ 0.05%, the Si of 0.30% ~ 0.40%, the Mn of 0.45% ~ 0.52%, the P of 0% ~ 0.012%, the S of 0% ~ 0.003%, the Cr of 1.85% ~ 1.95%, the Ni of 0% ~ 0.15%, the Mo of 0.35% ~ 0.45%, the Al of 0.055% ~ 0.65%, the V of 0.095% ~ 0.105%, the Nb of 0.055% ~ 0.065%, the Cu of 0% ~ 0.10%, the rare earth of 0.008% ~ 0.015%, surplus is Fe, rare earth comprises the La of 20% ~ 40%, the Ce of 40% ~ 50%, the Nd of 15% ~ the 20% and Pr of 1% ~ 5%.
4. corrosion-proof rare earth steel alloy as claimed in claim 3, is characterized in that: the content of described rare earth alloy steel middle-weight rare earths is 0.01%.
5. the corrosion-proof rare earth steel alloy according to any one of Claims 1 to 4, is characterized in that: described rare earth comprises La, the Ce of 48% of 30%, the Pr of the Nd of 19% and 3%.
6. the corrosion-proof rare earth steel alloy according to any one of Claims 1 to 4, is characterized in that: the yield strength of described rare earth alloy steel is 380 ~ 390MPa, and tensile strength is 540 ~ 565MPa.
7. the corrosion-proof rare earth steel alloy according to any one of Claims 1 to 4, is characterized in that: the relative reduction in area of described rare earth alloy steel is 63% ~ 65%, and elongation after fracture is 31% ~ 32%, and elongation is 34.5%.
8. the corrosion-proof rare earth steel alloy according to any one of Claims 1 to 4, is characterized in that: described grain fineness number is greater than 6 grades, and the summation of nonmetallic impurity is less than 4.0.
9. the corrosion-proof rare earth steel alloy according to any one of Claims 1 to 4, is characterized in that: the ballistic work of described rare earth alloy steel at 0 DEG C be 228J, ballistic work at-30 DEG C is 205J.
10. prepare a method for corrosion-proof rare earth steel alloy, it is characterized in that, comprise the following steps:
A, starting material are put into electric furnace refine, obtain molten steel; Molten steel is transferred to external refining bag and carries out external refining and vacuum outgas, the content adjusting C in ladle is 0% ~ 0.10%, the content of Si is 0.20% ~ 0.50%, the content of Mn is 0.40% ~ 0.60%, the content 0% ~ 0.018% of P, the content 0% ~ 0.005% of S, the content of Cr is 1.8% ~ 2.0%, the content 0% ~ 0.3% of Ni, the content of Mo is 0.30% ~ 0.50%, the content of Al is 0.04 ~ 0.08%, the content of V is 0.08 ~ 0.12%, the content of Nb is the content 0% ~ 0.2% of 0.04 ~ 0.08%, Cu;
B, bull ladle casting die casting obtains electrode billet, electrode billet is carried out esr, obtain rare earth alloy steel electroslag ingot, nearly finished product is obtained by after electroslag ingot hot-work, roughing, nearly finished product is carry out 700 ± 10 DEG C of temper after 950 ± 10 DEG C of normalizing treatment through temperature, then obtains rare earth alloy steel finished product through precision work.
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| CN107671228A (en) * | 2016-08-02 | 2018-02-09 | 中国科学院金属研究所 | A kind of casting technique of high-speed railway passenger rare earth alloy brake disc castings |
| CN108486504A (en) * | 2018-03-06 | 2018-09-04 | 朱敏 | A kind of C-Mn steel and its production technology |
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| CN114807784A (en) * | 2022-05-11 | 2022-07-29 | 重庆大学 | Corrosion-fracture-resistant high-strength steel in marine environment and preparation method thereof |
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