CN108950422A - Hardness 550HB slurry dredges effective erosion resistant steel plate and its production method - Google Patents
Hardness 550HB slurry dredges effective erosion resistant steel plate and its production method Download PDFInfo
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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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- 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
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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
- 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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- 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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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
- C21D2211/008—Martensite
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Abstract
A kind of dredging of hardness 550HB slurry erosion resistant steel and its production method, its composition by weight percent are as follows: C:0.30-0.34%, Si≤0.01%, Mn:1.5-1.8%, P≤0.015%, S≤0.005%, Al:0.2-1.0%, Cr:0.3-1.2%, B:0.001-0.002%, N≤0.005%；In addition contain one or both of Nb:0.01-0.03% or Ti:0.01-0.025%, and meet Nb+Ti≤0.045 6.65N <, remaining is Fe and inevitable impurity element.The design of erosion resistant steel steel of the present invention has taken into account corrosion-resistant and abrasion resistance properties, it is mainly used for the dredging pipe production in the fields such as reclaiming land around sea, waterway dredging, its wear-corrosion resistance reaches 3 times of current common tube, so that dredging efficiency be greatly improved, reduce operating cost.
Description
Technical field
The present invention relates to manufacture field of low alloy steel, in particular to hardness 550HB slurry dredge effective erosion resistant steel plate and
Its production method.
Background technique
The solid particles such as a large amount of silt, grit are in the operations such as reclaiming land around sea, waterway dredging, bunding maintenance with the shape of slurry
Formula carries out long distance delivery by dredging pipe, and tube body bears the electrochemical corrosion of slurry medium and the abrasion of solid particle simultaneously
And it is denuded more caused by tube body when containing decomposed rock, coral reef, medium coarse sand in the reciprocation of the two, especially seawater slurry
To be serious, service life of common Q 235B, the Q345B texture pipeline under harsh working condition is shorter, or even discontented 1 year reports
It is useless.
As disclosed in China Patent Publication No. CN102517509A " HB500 grade wear-resisting steel plate and preparation method thereof " and China
" a kind of martensite series abrasion-resistant stee and preparation method thereof " disclosed in patent publication No. CN103397275A.The two patents at
Setting up separately on meter is that the alloying elements such as a large amount of alloying element such as Mo, Cu and Ni are added on the basis of C-Mn, one side alloy at
This is higher, while Cu and Ni are common anti-corrosion element in weather resisting steel, promotes the formation of steel surface protective rust,
Increase abrasion weightlessness, the abrasion failure of accelerated material in erosion process.Patent is related to steel grade hardness in 500HBW or more, wear-resisting
Better performances are damaged, the fields such as engineering machinery, mining equiment are mainly used for.But do not consider to press down in terms of composition design due to being related to steel grade
System corrosion, so wear-corrosion resistance is poor, is unable to satisfy requirement under corrosion+abrasion working condition.
Japanese Patent No. JP2007231321A, JP2008169443A describes the Carbide Precipitation particle by Ti and W
The method for improving wear-resisting property, simultaneously containing expensive alloying elements such as Cu, Ni, Cr, Mo in ingredient.A large amount of carbide in matrix
Particle plays " cathode " role under corrosive wear working condition, promotes the generation of electrochemical corrosion, and corrosion resistance reduces,
It is degrading the wear-corrosion resistance of material, it is difficult to meet the bulky grain size under slurry dredging environment, the abrasion of high-content slurry requires.
China Patent Publication No. CN101886225A (comparison patent 2) disclosed " a kind of corrosion-resistant and abrasion-resistant steel and its preparation side
Method ", which, which is related to steel grade, joined up to 0.4-0.9%C, 14-16%Mn, and Mo, Cr content is in 5-10%, additionally
Containing rare elements such as a certain amount of Pr, Nd and Gd, hardness can reach 52HRC or more, but the addition of a large amount of precious alloys improves
Manufacturing cost.
China Patent Publication No. CN102776445A (comparison patent 1) discloses that " a kind of slurry pipeline steel lower bainite is resistance to
Mill steel pipe and its manufacturing method ", China Patent Publication No. CN103436790A (comparison patent 3) disclose a kind of " pulp conveying
Welded tube pipeline abrasion-resistant stee and its manufacturing method ", it is bainite or bainite+acicular ferrite that the two patents, which are related to steel grade,
Tissue, matrix hardness is not high, and tensile strength only has 600-800MPa, is mainly used in the ore pulp or original of particle tiny (tens μm)
The slight work condition environments of abrasions such as oil conveying, are not suitable for bulky grain, highdensity seawater slurry pipeline steel field.Chinese patent is public
Mn content is higher in the wear-resistant steel pipe ingredient of the number of opening CN102776445A, and requires to contain a certain amount of Mo, Ca and RE, and clear
It is required that addition N.C content is relatively low in the wear-resisting composition of steel of China Patent Publication No. CN103436790A, while certain V is added, by force
It spends lower.
Summary of the invention
The purpose of the present invention is to provide a kind of dredging of hardness 550HB slurry erosion resistant steel and its production methods, this is resistance to
The ingredient design of abrasion steel has taken into account corrosion-resistant and abrasion resistance properties, is mainly used for dredging for the fields such as reclaiming land around sea, waterway dredging
Pipeline production is dredged, wear-corrosion resistance reaches 3 times of current common tube, so that dredging efficiency be greatly improved, reduce operation
Cost.
In order to achieve the above objectives, the technical scheme is that
A kind of slurry dredging erosion resistant steel of hardness 550HB, composition by weight percent are as follows: C:0.30-0.34%, Si
≤ 0.01%, Mn:1.5-1.8%, P≤0.015%, S≤0.005%, Al:0.2-1.0%, Cr:0.3-1.2%, B:
0.001-0.002%, N≤0.005%；In addition contain one of Nb:0.01-0.03% or Ti:0.01-0.025% or two
Kind, and meeting Nb+Ti≤0.045 6.65N <, remaining is Fe and inevitable impurity element.
For the yield strength of erosion resistant steel of the present invention in 1400MPa or more, tensile strength is more than 1800MPa, elongation percentage
>=6%, 550 ± 30HBW of hardness, -40 DEG C of impact toughness values are more than 20J simultaneously.
In the ingredient design of steel of the present invention:
C is intensified element most cheap in steel, and the addition of appropriate C help to obtain martensitic structure, energy after heat treatment
The intensity and hardness of steel plate are enough significantly improved, but more C welds steel plate, toughness and plasticity are unfavorable.Meeting performance requirement
Under conditions of limit in the range of 0.30-0.34%；
Si is deoxidant element and solution strengthening element, while being also common anti-corrosion element in weather resisting steel.It is resistance to
The formation that atmosphere corrosion steel relies primarily on surface protective rusty scale inhibits the generation of corrosion, reaches the mesh for improving atmospheric corrosion resistance
Mark.The corrosion resistance that weather resisting steel is generally defined with weather-proof index I, usually requires that I >=6.0.Wherein
I=26.01*Cu+3.88*Ni+1.49*Si+1.2*Cr+17.28*P-7.29*Cu*Ni-9.1 * Ni*P-33.39*
Cu*Cu。
From weather-proof index composition as can be seen that Si content it is higher when promote steel surface protective rust formation, grinding
It loses these rusty scales under environment to be detached from from surface rapidly, promotes the abrasion failure of material.So the present invention is using Si as harmful member
Element is controlled, and is reduced the additive amount of Si as far as possible, is limited its content below 0.01%.So being also added without in steel grade of the present invention
Cu and Ni.
Mn is also intensified element common in steel, improves yield strength by solution strengthening, reduces elongation percentage, shows simultaneously
The phase transition temperature for reducing steel is write, the microscopic structure of steel is refined, is important Strengthening and Toughening element, but Mn content excessively makes harden ability
Increase, deteriorates so as to cause solderability and welding heat influence area toughness so control is between 1.5-1.8%.
P is main anti-corrosion element in traditional weather resisting steel, promotes the formation of surface protective rusty scale, effectively improves
The atmospheric corrosion resistance of steel, but the formation of Surface Rust is weightless by the abrasion of accelerated material in erosion process, reduces wear-resisting
Corrosion energy, while the presence of P is also easy to produce segregation, reduces the toughness and plasticity of steel, and steel plate is become fragile, influences toughness, so
The content of P in steel should be reduced as far as possible, require the control of its content below 0.015% in the present invention.
S can be improved the yield strength of steel, but the presence of S will deteriorate the atmospheric corrosion resistance of steel and steel plate is become
It is crisp, reduce the low-temperature flexibility of steel, it is desirable that control its content below 0.005.
Al is added in steel usually in steelmaking process as deoxidier, and micro Al is conducive to refine crystal grain simultaneously, is changed
The toughness and tenacity of kind steel.In the present invention on the one hand Al is used as deoxidier to add, after furthermore adding appropriate Al, the corrosion potential of steel
It improves, is conducive to the generation for inhibiting to corrode in erosion process, improve wear-corrosion resistance.But excessively high Al will make ferrite in steel crisp
Property increase and lead to the reduction of steel toughness, so controlling its content 0.2-1.0%.
B has good harden ability, so that steel plate hardness is improved, but B content is excessively high unfavorable to welding, so controlling respectively
In the range of 0.001-0.002%；
Cr has solid solution strengthening effect, and to the smallest anti-corrosion element of contribution coefficient in weather-proof index I, while Cr is to base
The current potential raising of body has remarkable effect.The addition of appropriate Cr can effectively improve the corrosion potential of steel, inhibit the generation of corrosion, from
And the facilitation corroded in erosion process to material failure is effectively reduced, improve wear-corrosion resistance.But Cr is precious alloy member
Element, so limiting its content as 0.3-1.2%.
Nb is strong nitrogen carbide formation element, can in steel carbon, formed in NbC, Nb (CN) and NbN etc. in conjunction with nitrogen
Between phase, be formed by fine carbide particle energy thinning microstructure, and generate precipitation strength effect, significantly improve the intensity of steel plate,
But more Nb is unfavorable to welding, and can choose addition, it is proposed that is no more than 0.03%.
On the one hand it is the Austenite Grain Growth inhibited during slab reheating that selection addition, which is no more than 0.025%Ti, together
When during Controlled Cooling inhibit ferrite crystal grain grow up, improve the toughness of steel.Trace Ti is added simultaneously in steel containing Al can
To be substantially reduced corrosion rate, and Ti can preferentially have the combination of the N in steel, reduce the quantity of AlN in steel.
Al element easily forms AIN in conjunction with N in steel, so that the nitride quantity in steel be made significantly to increase.AIN is as a kind of
When non-metallic inclusion is independently present in steel, destroy the continuity of steel matrix, especially AIN quantity it is more, in aggregation point
When cloth, the extent of injury is more very.Steel grade of the present invention joined more Al, so N content must be controlled below 0.0050%.
Using obtaining high-intensitive martensitic structure after the steel grade heat treatment of mentioned component design, yield strength >=
1400MPa, tensile strength >=1800MPa, elongation percentage >=8%, 550 ± 30HB of hardness, to have good abrasion resistance properties；
The addition of Cr, Al simultaneously and the corrosion potential that matrix is improved to the limitation of the ingredients such as Si, P, effectively slow down, inhibit corrosion
Generation, improve the corrosion resistance of material so that steel grade have good wear-corrosion resistance, be suitable for bulky grain,
Highdensity slurry pipeline steel field.
The slurry dredging of the hardness 550HB of the present invention production method of erosion resistant steel comprising following steps:
1) it smelts, cast
It smelted by mentioned component, be cast as base；
2) slab reheats
1200 DEG C of heating temperature or more, soaking time 2h or more, wherein soaking soaking time is not less than 40min；
3) controlled rolling
Rolling is divided into two stages of roughing and finish rolling, and slab uses heavy reduction rolling in rough rolling step, controls passage pressure
Lower rate is in 18% or more or reduction in pass 40mm or more；The thickness of intermediate base and finished product ratio >=3 are required simultaneously, and control finish rolling
Last percentage pass reduction is not less than 16%；840 DEG C of finishing temperature or more；
4) it batches
Oiler temperature control is at 600-640 DEG C；
5) uncoiling, aligning, cutting plate
6) it is quenched
Heating and temperature control controls quenching temperature at 840 DEG C -870 DEG C, protects 50 DEG C -80 DEG C more than steel grade Ac3 point
Warm time T1 starts to calculate from steel plate center portion to temperature, T1=steel plate thickness t × (2.5-3.5), T1, unit min, t, unit mm；
Direct-water-quenching forms complete martensitic structure to room temperature after steel plate is come out of the stove；Quench cooling rate >=20 DEG C/s；
7) tempering
Tempering, tempering insulation time T2 timing from steel plate center portion to temperature, T1=are carried out in 150-210 DEG C of section
Steel plate thickness t × (2.5-3.5), T2, unit min, t, unit mm；The minimum no less than 15min of T2；Tempered martensite is obtained after tempering
Body tissue, steel plate toughness and cold-bending property are improved；Last steel plate carries out finishing processing.
In the production method of steel of the present invention:
Slab is subjected to heating and thermal insulation before rolling, 1200 DEG C of heating temperature or more, soaking time 2h or more, wherein soaking is protected
The warm time is not less than 40min.In addition, slab hot charging can enter furnace after the completion of casting, that is, confirm casting billet surface massless problem
Heating furnace is directly transported to by roller-way from casting area afterwards and carries out heating and thermal insulation, so as to reduce energy consumption；It is such as unable to hot charging,
Slab after then casting must be put into holding pit and carry out slow cooling, and being reduced to 200 DEG C or less rears to temperature can be removed holding pit sky
It is cold.
Rolling is divided into two stages of roughing and finish rolling.To obtain thin original austenite grains degree, slab is in rough rolling step
Using heavy reduction rolling, percentage pass reduction is controlled in 18% or more or reduction in pass 40mm or more.To obtain thin crystal grain
Degree and good plate shape, while requiring the thickness of intermediate base and finished product ratio >=3, and control finish rolling last percentage pass reduction not
Lower than 16%, to guarantee to deform more than critical strain amount, to obtain good plate shape and uniform matrix.
Heat-treated offline is used after rolling since the present invention relates to steel grades, is had no special requirements to the rolling temperature of slab.But
In order to reduce rolling loads, so using finish to gauge high as far as possible and coiling temperature.In terms of the continuous transition curve of Fig. 1, the ɑ of steel grade
→ γ transition point is about 780 DEG C, so recommending the finishing temperature using 840 DEG C or more, to guarantee to realize complete austenitic area
Rolling, and then realize the stabilization of low rolling loads and rolling loads, be conducive to the subsequent plate shape for obtaining high quality.Coiling temperature
Control is excessively high then unfavorable to coiling machine between 600-640 DEG C, lower, batches load increase.
The coil of strip for being cooled to room temperature is subjected to cutting plate after uncoiling is aligned, steel plate is quenched, tempering.Quench heating
Temperature directly affects the granularity of subsequent martensitic structure, and then influences the toughness of steel plate.Heating temperature is excessively high to be easy to make austenite
Grain coarsening, martensitic structure is coarse after quenching, and toughness deteriorates, while increasing production cost；And heating temperature is relatively low, causes
Austenitizing is insufficient, and complete martensitic structure can not be obtained after quenching.Soaking time also has similar rule to quenching property,
Overlong time is easy so that coarse grains, while increasing energy consumption, improves cost, and the time, too short then austenitizing was insufficient, quenching
Hardness, intensity do not reach requirement afterwards.The present invention relates to about 790 DEG C of the Ac3 of steel grade, heating and temperature control 50 DEG C more than Ac3 point-
80 DEG C (840 DEG C -870 DEG C), soaking time starts to calculate from steel plate center portion to temperature, is 2.5-3.5 times of steel plate thickness.Steel plate goes out
For direct-water-quenching to room temperature, the martensite Critical cooling speed of steel grade of the present invention is not high, it requires quenching cooling rate >=20 DEG C/s i.e. after furnace
It can get complete martensitic structure.
Tempering mainly slows down, eliminates quenching stress, improves toughness and toughness.Higher tempering temperature is easy so that steel plate
Intensity, hardness reduce excessive, be unable to satisfy design requirement, while increased costs.So the tempering process parameters of reply steel plate
It is limited.Tempering is carried out in 150-210 DEG C of section to steel plate in the present invention, tempering insulation time is from steel plate center portion to temperature
Start timing, the time is 2.5-3.5 times of plate thickness, but minimum must not be less than 15min.Essence finally is carried out to quenching, tempering steel plate
Whole processing (aligning, trimming), dispatches from the factory after performance is qualified and lets pass.
The production of 8-18mm thickness high hardness wear-resisting erosion steel plate may be implemented using present invention process.Steel plate yield strength exists
1400MPa or more, tensile strength are more than 1800MPa, elongation percentage >=6%, 550 ± 30HBW of hardness, simultaneously -40 DEG C of impact toughness values
More than 20J.In conjunction with the corrosion-resistant design of steel grade, steel plate has good wear-corrosion resistance.It is starched in bulky grain, highdensity seawater
Body transport environment wear-corrosion resistance can reach 3 times or more of common Q 235B pipe.
Compared with existing patent, steel of the present invention has significant difference on ingredient and performance:
On ingredient, comparison patent 1 needs to add Mo, Ca and RE of 0.01-1.0%, while also requiring N content 0.01-
0.1%, the raising of intensity is realized by N, while the upper limit of Mn content reaches 5%, close to the ingredient of medium managese steel；Compare patent 2
In C, Mn, Cr content be up to 0.4-0.9%, 14-16% and 5-10% respectively, and require addition Pr, Dy, Gd and Nd etc. a variety of
Rare element；Patent 3 is compared to design using lower C, by V precipitation strength, while Al content maintains reduced levels, and originally
Invention steel grade improves corrosion resistance by Cr, Al, and Al content is apparently higher than comparison patent 3.
In addition, the mechanical property requirements of steel of the present invention are also different from comparison patent steel.Steel of the present invention requires yield strength
1400MPa or more, elongation percentage >=8%.And the yield strength range for comparing patent 1 is then more wide in range, from 300MPa up to
2500MPa sacrifices plasticity although very high intensity may be implemented, and elongation percentage not can guarantee, and limits its cold working application
Range；Although it is more than 50HRC that hardness may be implemented by the intensified element of high-content in comparison patent 2, but equally exists elongation percentage
Not the problem of not can guarantee；The intensity for comparing patent 3 is obviously relatively low, just corresponds to common pipe line steel X70 intensity rank.
The present invention has the advantage that
The present invention has developed a kind of hardness by the way of inhibiting corrosion+raising hardness on the basis of proper content C, Mn
Up to the effective erosion resistant steel of slurry pipeline steel of 550HBW.Its high rigidity by C and a small amount of Nb, Ti microalloy element through it is appropriate from
Line heat treatment process is realized；In terms of corrosion control, abandon anti-corrosion by addition Cu, Si, P etc. in traditional weather resisting steel
Element mode improves corrosion resisting property, but improves matrix current potential by the addition of the elements such as Cr, Al, inhibits mill with the raising of current potential
The generation corroded during erosion, so as to improve the corrosion resistance of steel plate.Hardness is improved on the basis of inhibiting corrosion, so that
Steel grade has good wear-corrosion resistance under corrosive wear environment, especially in bulky grain, highdensity seawater slurry pipeline steel
Under the conditions of wear-corrosion resistance reach 3 times of common tube or more.
The present invention relates to steel grades to have good low-temperature impact toughness and clod wash processing performance, meets subsequent dredging pipe
Tubulation processing request can realize the light tubulation of high rigidity steel plate on the basis of existing equipment.
The present invention relates to the simple production process of steel grade, expensive alloying elements content is low, reduces production difficulty and production
Cost is conducive to a wide range of popularization of steel grade.
Detailed description of the invention
Fig. 1 is CCT curve (calculating) figure of steel of the present invention.
Specific embodiment
Below with reference to embodiment, the present invention will be further described.
According to erosion resistant steel plate chemical component of the present invention requirement, the steel plate of different-thickness specification is prepared.Embodiment
Steel chemical composition is shown in Table 1, and embodiment steel processing parameter is referring to table 2.
Embodiment production technology are as follows:
Deeply de- S (guaranteeing S content low in steel) → converter top bottom blowing (control the C content) → external refining of molten iron →
Continuous casting (machine is clear) → slab reheating → controlled rolling → control cool down → batches → and uncoiling → aligning → cutting plate → heat treatment (quenches
Fire+tempering) → finishing → delivery.
Wherein, billet heating temperature is 1200 DEG C, 850 DEG C of finishing temperature, rolls rear water cooling and batches to 620 DEG C；Coil of strip is through rectifying
Cutting plate after straight, quenches steel plate, tempering；Heating temperature is more than 50 DEG C -80 DEG C of steel grade Ac3 temperature spot, tempering temperature
150-210℃.Embodiment erosion resistant plate property is shown in Table 2.
1 unit wt% of table
| Number | C | Si | Mn | P | S | Al | N | Ti | Cr | Nb | B |
| A | 0.30 | 0.01 | 1.60 | 0.011 | 0.004 | 0.21 | 0.0024 | 0.015 | 1.20 | 0.012 | 0.0015 |
| B | 0.31 | 0.005 | 1.51 | 0.012 | 0.0045 | 0.80 | 0.0031 | 0.024 | 0.51 | - | 0.0017 |
| C | 0.34 | 0.007 | 1.73 | 0.014 | 0.006 | 0.98 | 0.0028 | - | 0.31 | 0.026 | 0.0018 |
| D | 0.33 | 0.004 | 1.80 | 0.009 | 0.003 | 0.74 | 0.0033 | 0.018 | 1.15 | 0.021 | 0.0014 |
| E | 0.32 | 0.004 | 1.65 | 0.009 | 0.003 | 0.56 | 0.0045 | 0.022 | 0.85 | 0.023 | 0.0012 |
| F | 0.34 | 0.004 | 1.50 | 0.009 | 0.003 | 0.48 | 0.0038 | 0.012 | 0.78 | 0.015 | 0.0019 |
Table 2
Table 3
From upper table as it can be seen that steel plate hardness of the present invention is more than 550HBW, tensile property also meets design requirement, tool
There are good abrasion resistance properties；The addition of Cr, Al effectively increase the corrosion potential of matrix simultaneously, inhibit the generation of corrosion,
To have excellent wear-corrosion resistance.
In conclusion the present invention is with relatively simple, economic ingredient, to inhibit corrosion+raising abrasion resistance properties wear-resisting
Steel design concept is lost, the martensitic structure slurry dredging tube steel that a kind of hardness reaches 550HBW is developed.Using appropriate heat
Treatment process, steel grade have higher hardness, improve abrasion resistance properties；The anti-corrosion element for promoting rusty scale to be formed is limited simultaneously to add
Enter, but added with the anti-corrosion element for being conducive to the raising of matrix current potential, to have corrosion potential more higher than ordinary steel, effectively
Inhibit the generation corroded in erosion process, in conjunction with its high rigidity feature, during bulky grain, highdensity seawater slurry pipeline steel
With good wear-corrosion resistance, and at the same time having good clod wash processing and welding performance, excellent in low temperature toughness, and cost
It is cheap.These are not available for other current known patent steel grades.
Erosion resistant steel plate of the present invention can be used for the production of slurry dredging pipe, be widely used in reclaiming land around sea, navigation channel
The fields such as dredging, inland river dredging and pulp conveying, replace current Q235, Q345 rank commonly to dredge pipeline, to improve life
It produces efficiency, reduce operating cost.
Claims (5)
1. a kind of hardness 550HB slurry dredging erosion resistant steel, composition by weight percent are as follows: C:0.30-0.34%, Si≤
0.01%, Mn:1.5-1.8%, P≤0.015%, S≤0.005%, Al:0.2-1.0%, Cr:0.3-1.2%, B:0.001-
0.002%, N≤0.005%；In addition contain one or both of Nb:0.01-0.03% or Ti:0.01-0.025%, and full
Nb+Ti≤0.045 sufficient 6.65N <, remaining is Fe and inevitable impurity element.
2. hardness 550HBWD slurry dredging erosion resistant steel as described in claim 1, which is characterized in that the erosion resistant steel
Yield strength in 1400MPa or more, tensile strength is more than 1800MPa, elongation percentage >=6%, 550 ± 30HBW of hardness, simultaneously-
40 DEG C of impact toughness values are more than 20J.
3. the slurry dredging of the hardness 550HB as described in claim 1 production method of erosion resistant steel,
It is characterized in that including the following steps:
1) it smelts, cast
It smelted by ingredient described in claim 1, be cast as base；
2) slab reheats
1200 DEG C of heating temperature or more, soaking time 2h or more, wherein soaking soaking time is not less than 40min；
3) controlled rolling
Rolling is divided into two stages of roughing and finish rolling, and slab uses heavy reduction rolling in rough rolling step, controls percentage pass reduction
In 18% or more or reduction in pass 40mm or more；The thickness of intermediate base and finished product ratio >=3 are required simultaneously, and it is last to control finish rolling
A time reduction ratio is not less than 16%；840 DEG C of finishing temperature or more；
4) it batches
Oiler temperature control is at 600-640 DEG C；
5) uncoiling, aligning, cutting plate
6) it is quenched
Heating and temperature control controls 840-870 DEG C of quenching temperature 50 DEG C -80 DEG C more than steel grade Ac3 point；Soaking time T1
Start to calculate from steel plate center portion to temperature, T1=steel plate thickness t × (2.5-3.5), T1, unit min, t, unit mm；Steel plate is come out of the stove
Direct-water-quenching quenches cooling rate >=20 DEG C/s to room temperature afterwards；
7) tempering
Tempering, tempering insulation time T2 timing from steel plate center portion to temperature, T2=steel plate are carried out in 150-210 DEG C of section
Thickness t × (2.5-3.5), T2, unit min, t, unit mm；Minimum no less than 15min；Last steel plate carries out finishing processing.
4. the production method that erosion resistant steel is used in hardness 550HB slurry dredging as claimed in claim 3, characterized in that described resistance to
Abrasion steel plate thickness is 8-18mm.
5. the production method that erosion resistant steel is used in hardness 550HB slurry dredging as described in claim 3 or 4, characterized in that described
The yield strength of erosion resistant steel is in 1400MPa or more, and tensile strength is more than 1800MPa, elongation percentage >=6%, and hardness 550 ±
30HBW, -40 DEG C of impact toughness values are more than 20J simultaneously.
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| US20220042152A1 (en) * | 2018-09-27 | 2022-02-10 | Posco | Abrasion resistant steel having excellent hardness and impact toughness and manufacturing method therefor |
| CN115369306A (en) * | 2022-08-31 | 2022-11-22 | 四川六合特种金属材料股份有限公司 | Method for improving non-metallic inclusions in 1Ni3MnCuMoAl large steel ingots |
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| CN108950422B (en) | 2020-08-25 |
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