CN108930002A - Hardness 500HB slurry dredges effective erosion resistant steel plate and its production method - Google Patents
Hardness 500HB slurry dredges effective erosion resistant steel plate and its production method Download PDFInfo
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- CN108930002A CN108930002A CN201710383618.4A CN201710383618A CN108930002A CN 108930002 A CN108930002 A CN 108930002A CN 201710383618 A CN201710383618 A CN 201710383618A CN 108930002 A CN108930002 A CN 108930002A
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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
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
Abstract
Hardness 500HB slurry dredges effective erosion resistant steel plate and its production method, composition by weight percent are：C：0.25-0.28%, Si≤0.01%, Mn：1.3-1.6%, 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 Nb：0.01-0.03% or Ti：One or both of 0.01-0.025%, and meet Nb+Ti≤0.045 6.65N <, remaining is Fe and inevitable impurity.Erosion resistant steel plate yield strength 1200MPa or more, tensile strength are more than 1500MPa, and elongation percentage >=8%, 500 ± 30HBW of hardness, -40 DEG C of impact toughness values are more than 20J.The ingredient design of erosion resistant steel plate 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 2.5 times of current common tube, to increase substantially dredging efficiency, reduce operating cost.
Description
Technical field
The present invention relates to manufacture field of low alloy steel, in particular to hardness 500HB 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.
Abrasion Resistant Steels " HB500 grade wear-resisting steel plate and its preparation side as disclosed in China Patent Publication No. CN102517509A
Disclosed in method " and China Patent Publication No. CN103397275A " a kind of martensite series abrasion-resistant stee and preparation method thereof ", this two
A patent is that a large amount of alloying element such as Cu, Mo, Ni etc. are added on the basis of C-Mn in terms of composition design, cost of alloy compared with
It is high.Patent is related to steel grade hardness and reaches about 500HBW or so, and abrasion resistance properties are preferable, is mainly used for engineering machinery, mining equiment
Equal fields.But do not consider to inhibit corrosion in terms of composition design due to being related to steel grade, especially Cu, Ni are as in weather resisting steel
Common alloying element, higher additional amount will promote the formation of surface protective rusty scale, and the material increased in erosion process loses
Weight, wear-corrosion resistance is poor, is unable to satisfy requirement under corrosion+abrasion working condition.
Also just like " wear resistant steel sheet " disclosed in Japanese Patent No. JP2007231321A and Japan
" wear-resistant steel sheet superior in workability disclosed in patent No. JP2008169443A
And manufacturing method therefor " is described wear-resisting by the Carbide Precipitation particle raising of Ti and W
The method of performance, simultaneously containing expensive alloying elements such as Cu, Ni, Cr, Mo in ingredient.Although being related to steel grade with high rigidity and resistance to
Wearing character, but a large amount of carbide particle plays " cathode " role under corrosive wear working condition in matrix, promotes electricity
The generation of chemical attack, corrosion resistance reduce, and are degrading the wear-corrosion resistance of material, it is difficult to meet under slurry dredging environment
Bulky grain size, the abrasion of high-content slurry require.
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, belong to high alloy steel grade, cost is very high；And China Patent Publication No.
CN102776445A (comparison patent 1) disclosed " a kind of slurry pipeline steel lower bainite wear-resistant steel pipe and its manufacturing method " and in
State patent publication No. CN103436790A (comparison patent 3) disclosed " a kind of wear-resistant steel for ore slurry delivering welded pipe line and its system
Make method ", it is bainite or bainite+acicular ferrite structure that the two patents, which are related to steel grade, and matrix hardness is not high, tension
Intensity only 600-800MPa, is mainly used in the slight operating condition rings of abrasions such as ore pulp or the Crude Oil Transportation of particle tiny (tens μm)
Border is not suitable for bulky grain, highdensity seawater slurry pipeline steel field.
Summary of the invention
It is an object of the invention to a kind of hardness 500HB slurries to dredge effective erosion resistant steel plate and its production method, steel
Ingredient design has taken into account corrosion-resistant and abrasion resistance properties, is mainly used for the dredging pipe system in the fields such as reclaiming land around sea, waterway dredging
Make, wear-corrosion resistance reaches 2.5 times of current common tube, so that dredging efficiency be greatly improved, reduce operating cost.
In order to achieve the above objectives, the technical scheme is that：
Hardness 500HB slurry dredges effective erosion resistant steel plate, and composition by weight percent is：C：0.25-0.28%, Si≤
0.01%, Mn：1.3-1.6%, 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 Nb：0.01-0.03% or Ti：One or both of 0.01-0.025%, and it is full
Nb+Ti≤0.045 sufficient 6.65N <, remaining is Fe and inevitable impurity.
For the yield strength of steel plate of the present invention in 1200MPa or more, tensile strength is more than 1500MPa, and elongation percentage >=
8%, 500 ± 30HBW of hardness, -40 DEG C of impact toughness values are more than 20J.
In the ingredient design of steel of the present invention：
C is intensified element most cheap in steel, and high hardness martensitic tissue is obtained after heat treatment, can significantly improve steel plate
Intensity, but more C to steel plate weld, toughness and plasticity it is unfavorable.Under conditions of meeting performance requirement limit in the range of
0.25-0.28%；
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%.It is also added without in steel grade of the present invention simultaneously
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 1.3-1.6%.
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, it is necessary to control N content below 0.0050%.
After heat treatment obtain high-intensitive tempered martensite using the steel grade that mentioned component designs, yield strength >=
1200MPa, tensile strength >=1500MPa, elongation percentage >=8%, 500 ± 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.
Hardness 500HB slurry of the present invention dredges the production method of effective erosion resistant steel plate 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 rough rolling step uses heavy reduction rolling, and control percentage pass reduction exists
18% or more or reduction in pass 40mm or more, while requiring the thickness of intermediate base and finished product ratio >=3, and control finish rolling last
Percentage pass reduction is not less than 16%；Finishing temperature is not less than 860 DEG C；
4) it batches
Oiler temperature control is between 640-680 DEG C；
5) uncoiling, aligning, cutting plate
6) it is heat-treated, quenching+tempering
Quenching, heating and temperature control is 50 DEG C -80 DEG C, 860 DEG C -890 DEG C of heating temperature more than steel grade Ac3 point；When heat preservation
Between 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
Direct-water-quenching forms martensitic structure, it is desirable that cooling rate >=50 DEG C/s to room temperature after coming out of the stove；
Tempering carries out tempering in 180-240 DEG C of section, and tempering insulation time T2 starts to count from steel plate center portion to temperature
When, T2=steel plate thickness t × (2.5-3.5), T2, unit min, t, unit mm；The minimum no less than 10min of T2；Steel plate after tempering
Matrix is tempered martensite, has suitable hardness and good low-temperature impact toughness, while improving cold-bending property.Finally
Finishing processing is carried out to steel plate.
In the production method of steel plate 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, when wherein soaking is kept the temperature
Between be not less than 40min.In addition, slab hot charging can enter furnace after the completion of casting, i.e., after confirmation casting billet surface massless problem from
Casting area directly transports to heating furnace by roller-way and carries out heating and thermal insulation, so as to reduce energy consumption；It is such as unable to hot charging, then is poured
Slab after casting must be put into holding pit and carry out slow cooling, and it is air-cooled to be reduced to the removable holding pit in 200 DEG C or less rears to temperature.
Rolling is divided into two stages of roughing and finish rolling, and 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 it is not low to control finish rolling last percentage pass reduction
In 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 815 DEG C, so recommending the finishing temperature using 880 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；Steel plate is thicker
When can suitably reduce finishing temperature, but 860 DEG C must not be lower than.Oiler temperature control is excessively high between 640-680 DEG C, to batching
Machine is unfavorable, 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；And heating temperature is relatively low, causes austenitizing insufficient, quenches
Complete martensitic structure can not be obtained after fire.Soaking time also has similar rule to quenching property, overlong time be easy so that
Coarse grains, while increasing energy consumption, cost is improved, the time, too short then austenitizing was insufficient, and hardness, intensity are not achieved after quenching
It is required that.Require heating and temperature control 50 DEG C -80 DEG C (860 DEG C -890 DEG C) more than steel grade Ac3 point in the present invention, soaking time from
Steel plate center portion starts to calculate to temperature, is 2.5-3.5 times of steel plate thickness.Direct-water-quenching is to room temperature after steel plate is come out of the stove, it is desirable that cooling rate
≥50℃/s。
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 180-240 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 10min.Finally the steel plate of quenching, tempering is carried out
Finishing processing (aligning, trimming), dispatches from the factory after performance is qualified and lets pass.
The production of 8-20mm thickness high hardness wear-resisting erosion steel plate may be implemented using the method for the present invention.Steel plate yield strength exists
1200MPa or more, tensile strength are more than 1500MPa, elongation percentage >=8%, 500 ± 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 2.5 times or more of common Q 235B pipe.
Compared with existing patent, steel of the present invention has significant difference with comparison patent 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%, is realized by N strong
The raising of degree, while the upper limit of Mn content reaches 5%, close to the ingredient of medium managese steel；Compare C, Mn, Cr content point in patent 2
Not Gao Da 0.4-0.9%, 14-16% and 5-10%, and require a variety of rare elements of addition Pr, Dy, Gd and Nd etc.；Compare patent
3 are designed using lower C, and by V precipitation strength, while Al content maintains reduced levels, and steel grade of the present invention passes through Cr, Al
Improve corrosion resistance, 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 compared steel.Steel of the present invention requires yield strength 1200MPa
More than, elongation percentage >=8%.And the yield strength range for comparing 1 steel of patent is then more wide in range, from 300MPa up to 2500MPa, though
Very high intensity so may be implemented, but sacrifice plasticity, elongation percentage not can guarantee, and limits it and application range is cold worked；Comparison
Although it is more than 50HRC that hardness may be implemented by the intensified element of high-content in 2 steel of patent, but equally exists elongation percentage and not can guarantee
The problem of；The intensity for comparing 3 steel of patent is obviously relatively low, just corresponds to common pipe line steel X70 intensity rank.
The invention has the advantages that：
The present invention is aided with a small amount of Nb, Ti microalloy element, is realized steel using simple, economic C-Mn ingredient design
The high rigidity of kind；Matrix current potential is improved by the addition of the corrosion resistances elements such as Cr, Al simultaneously, inhibits the hair corroded in erosion process
It is raw, improve the corrosion resistance of steel plate.So that steel grade has good wear-corrosion resistance under corrosive wear environment, it is special
It is not wear-corrosion resistance reaches common tube under the conditions of bulky grain, highdensity seawater slurry pipeline steel 2.5 times 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 the CCT curve (calculating) of steel grade 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.The present invention
The chemical component of embodiment steel is shown in Table 1, and production technology is referring to table 2.
The present embodiment production method is 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, 870 DEG C of finishing temperature, rolls rear water cooling and batches to 660 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
180-240℃.Embodiment erosion resistant plate property is shown in Table 3.
1 unit of table：Wt%
| Number | C | Si | Mn | P | S | Al | N | Ti | Cr | Nb | B |
| A | 0.252 | 0.01 | 1.60 | 0.011 | 0.004 | 0.28 | 0.0044 | 0.015 | 1.20 | 0.012 | 0.0015 |
| B | 0.264 | 0.006 | 1.31 | 0.012 | 0.0045 | 0.8 | 0.0031 | 0.024 | 0.51 | - | 0.0017 |
| C | 0.241 | 0.008 | 1.33 | 0.014 | 0.005 | 1.12 | 0.0038 | - | 0.31 | 0.028 | 0.0018 |
| D | 0.280 | 0.004 | 1.40 | 0.007 | 0.0031 | 0.64 | 0.0033 | 0.018 | 0.85 | 0.0021 | 0.0014 |
| E | 0.242 | 0.004 | 1.55 | 0.013 | 0.0034 | 0.56 | 0.0045 | 0.022 | 0.85 | 0.023 | 0.0012 |
| F | 0.278 | 0.004 | 1.45 | 0.009 | 0.0037 | 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 500HBW, tensile property also meets design requirement, resistance to
Polishing machine is excellent；The addition of the elements such as Cr, Al improves matrix corrosion potential simultaneously, it is suppressed that the generation of corrosion, thus
Has excellent wear-corrosion resistance, wear-corrosion resistance is approximately equivalent to 2.5 times of straight carbon steel or so.
In conclusion the present invention is with relatively simple, economic ingredient, it is resistance to according to inhibition corrosion+raising abrasion resistance properties
Steel design concept is denuded, a kind of high-hardness pulp body dredging tube steel for reaching 500HBW rank is developed.Steel plate has good
Abrasion resistance properties, while corrosion is inhibited, there is good erosion resistant during bulky grain, highdensity seawater slurry pipeline steel
Performance, and at the same time have good clod wash processing and welding performance, excellent in low temperature toughness is low in cost, these be it is current its
Not available for his known patent steel grade.
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. hardness 500HB slurry dredges effective erosion resistant steel plate, composition by weight percent is：C：0.25-0.28%, Si≤
0.01%, Mn：1.3-1.6%, 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 Nb：0.01-0.03% or Ti：One or both of 0.01-0.025%, and it is full
Nb+Ti≤0.045 sufficient 6.65N <, remaining is Fe and inevitable impurity.
2. hardness 500HB slurry as described in claim 1 dredges effective erosion resistant steel plate, characterized in that the steel plate is bent
Intensity is taken in 1200MPa or more, tensile strength is more than 1500MPa, elongation percentage >=8%, 500 ± 30HBW of hardness, -40 DEG C of impacts
Work value is more than 20J.
3. the production method that hardness 500HB slurry as claimed in claim 1 or 2 dredges effective erosion resistant steel plate, characterized in that
Include the following steps：
1) it smelts, cast
Ingredient according to claim 1 is smelted, is 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 rough rolling step uses heavy reduction rolling, controls percentage pass reduction 18%
Above or reduction in pass 40mm or more, while the thickness of intermediate base and finished product ratio >=3 are required, and control the last a time of finish rolling
Reduction ratio is not less than 16%；Finishing temperature is not less than 860 DEG C；
4) it batches
Oiler temperature control is between 640-680 DEG C；
5) uncoiling, aligning, cutting plate
6) it is heat-treated, quenching+tempering
Quenching, heating and temperature control control 860-890 DEG C of quenching temperature 50 DEG C -80 DEG C more than steel grade Ac3 point；Heat preservation
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；Steel
Direct-water-quenching is to room temperature after plate is come out of the stove, it is desirable that cooling rate >=50 DEG C/s；
Tempering carries out tempering, tempering insulation time T2 timing from steel plate center portion to temperature, T2 in 180-240 DEG C of section
=steel plate thickness t × (2.5-3.5), T2, unit min, t, unit mm；The minimum no less than 10min of T2；Essence finally is carried out to steel plate
Whole processing.
4. the production method that hardness 500HB slurry as claimed in claim 3 dredges effective erosion resistant steel plate, characterized in that institute
State erosion resistant steel plate thickness 8-20mm.
5. the production method that hardness 500HB slurry as described in claim 3 or 4 dredges effective erosion resistant steel plate, characterized in that
The yield strength of the steel plate is in 1200MPa or more, and tensile strength is more than 1500MPa, elongation percentage >=8%, and hardness 500 ±
30HBW, -40 DEG C of impact toughness values are more than 20J simultaneously.
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