CN106756520A - A kind of slit and corrosion resistant reinforcing bar high and preparation method thereof - Google Patents
A kind of slit and corrosion resistant reinforcing bar high and preparation method thereof Download PDFInfo
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- CN106756520A CN106756520A CN201710126450.9A CN201710126450A CN106756520A CN 106756520 A CN106756520 A CN 106756520A CN 201710126450 A CN201710126450 A CN 201710126450A CN 106756520 A CN106756520 A CN 106756520A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
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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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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Abstract
The invention discloses a kind of slit and corrosion resistant reinforcing bar high and preparation method thereof, its drip irrigation device is prepared from by the raw material of following weight percent content：C0.005 0.04, Si0.15 0.45, Mn0.5 1.2, P≤0.014, S≤0.007, Cr8.0 12.0, Ni0.3 0.7, Mo0.05 0.25, remaining be Fe.By adding its corrosion resistance of slit and corrosion resistant reinforcing bar NHOOCr 1 high obtained in said components good, and impurity content is few, and intensity, the performance of toughness each side are all more excellent.
Description
Technical field
The present invention relates to alloy field, more particularly to a kind of slit and corrosion resistant reinforcing bar high and preparation method thereof.
Background technology
In China's Nanhai area high temperature, high humidity, high chloride ion environment to islands and reefs construction slit and corrosion resistant reinforcing bar, high durable
Welded steel structure and stainless steel have specific demand.
The Chinese patent of Application No. 200910091567.3 discloses a kind of slit and corrosion resistant steel, is primarily adapted for use in radiating
The making of device part：The chemical composition (weight %) of the steel is C≤0.06%, Si≤0.1%, Mn≤0.30%, P 0.05-
0.10%, S≤0.01%, Cu 0.2-0.5%, B 0.001-0.005%, Cr0.3-0.6%, remaining is Fe.It is contained in component
S combined with Mn and can be generated MnS, the precipitability epithelium generation that the sulfide of Cu is formed is hindered, for the corrosion resistance club of steel
Exert an adverse impact.
The content of the invention
In view of the shortcomings of the prior art, it is an object of the invention to provide a kind of slit and corrosion resistant reinforcing bar high and its system
Preparation Method, the slit and corrosion resistant reinforcing bar high has excellent decay resistance.
Above-mentioned technical purpose of the invention technical scheme is that：A kind of slit and corrosion resistant steel high
Muscle, is prepared from by the raw material of following weight percent content：C 0.005-0.04、Si 0.15-0.45、Mn 0.5-1.2、P
≤ 0.014, S≤0.007, Cr 8.0-12.0, Ni 0.3-0.7, Mo 0.05-0.25, remaining be Fe and inevitably it is miscellaneous
Matter.
By above-mentioned setting, C is important intensified element, and steel is significantly improved by the effect of solution strengthening and precipitation strength
Intensity, but with the increase of C content, notch toughness reduction, and heat affected area hardness is improved, and steel elongation percentage under
Drop；Si is important reducing agent and deoxidier, Si oxide epithelium is formed in steel surface in corrosive environment, with making corrosion resistant
The effect that corrosion can be improved, adds Si to significantly improve elastic limit, yield point and the tensile strength of steel in component, Si contents increase
Plus, the welding performance of steel can be reduced；Mn is good deoxidier and desulfurizing agent, and steel is improved mainly as solution strengthening in steel
Intensity, is important intensified element, and the too high quenching degree that can significantly improve steel of manganese content reduces the plasticity and solderability of steel, manganese
There is good corrosion resistance for marine climate, and if when manganese content be less than 0.5%, cannot ensure required by material
Intensity；P-shaped turns into the phosphorous oxides of stabilization and forms epithelium in steel surface, with the effect for making corrosion dissolution react reduction,
It is the element required for corrosion resistance is improved, but the excessive phosphorus of addition can reduce notch toughness and welding performance, and work as P and Si
With the use of when stainless steel decay resistance significantly improve；S is harmful element, steel is produced fragility, reduces the ductility of steel
And toughness, crackle is caused in forging and rolling, sulphur is also unfavorable to welding performance, reduces decay resistance, but add sulphur energy
Enough improve cutting ability；Cr is formed as the Cr oxides of stabilization, and epithelium is formed in steel surface, subtracts with corrosion dissolution is reacted
Few effect, is the element required for corrosion resistance is improved, moreover it is possible to intensity, quenching degree and the crystal grain thinning of steel are improved, with carrying
The effect of high tenacity and corrosion resistance, it coordinates with P can further improve corrosion resistance, and works as Si and Cr and use cooperatively and be
Corrosion resistance can be further improved, and C and Cr has very strong affinity, and the carbonization of a series of complex can be formed with Cr
Thing, while the intensity and hardness of steel is increased, significantly reduces the corrosion resistance of steel；Ni can improve the crystal of steel in stainless steel
Structure, there is corrosion resistance higher to soda acid, there is antirust and temperature capacity at high temperature, is effective unit that corrosion resistance is improved
Element, the corrosion resistance enhancing when Ni and Cr are used cooperatively；Mo can generally improve the corrosion resistance of steel, in reproducibility acid and by force
In the salting liquid of oxidisability steel surface can be passivated, moreover it is possible to prevent steel from spot corrosion, Mo energy occurring in chloride solution
Promote crystal grain refinement, improve the quenching degree and heat resistance of steel, steel can be significantly improved when Mo, Ni, Cr three use cooperatively
Decay resistance.
The present invention is further arranged to：The percentage by weight of the C is 0.015-0.025%.
By above-mentioned technical proposal, due to when the content of C is higher, the meeting under the half balance state of quick heating and cooling
Generation part peritectic reaction, the content for reducing C is to improve one of notch toughness, weldability and the maximally effective method of stampability,
So selection C content 0.015-0.025% can either proof strength, notch toughness, weldability and punching are enabled to again
Pressure property is improved, because its corrosion resistance declines when C and Cr are used cooperatively, selection should in the range of enable to corrosion resistance
The reduction amount of energy is controlled in less scope.
The present invention is further arranged to：The percentage by weight of the Mn is 0.7-0.9%.
By above-mentioned technical proposal, due to manganese can also be added to improve the intensity of steel in component, but it is easily and group
S in point easily forms MnS and endangers larger to corrosion-resistant, it is contemplated that the intensity and toughness of steel are taken into account, so control Mn's contains
Amount is in 0.7-0.9%.
The present invention is further arranged to：The percentage by weight of the Mo is 0.1-0.15%.
By above-mentioned technical proposal, because Mo has good decay resistance in chloride solution, selection content exists
In 0.1-0.15%, being capable of the more excellent performance of producing ratio.
The present invention is further arranged to：It is prepared from by the raw material of following weight percent content：C 0.015-0.025、
Si 0.15-0.45、Mn 0.7-0.9、P≤0.014、S≤0.007、Cr 8.0-12.0、Ni 0.3-0.7、Mo 0.1-0.15、
Remaining is Fe and inevitable impurity.
By above-mentioned technical proposal, selection component within the range, can by obtaining the effect of cooperating between each component
Realize the function admirable of the reinforcing bar of production.
The present invention is further arranged to：Yield strength is 400-800MPa, and tensile strength is 530-950MPa, and yield tensile ratio is
0.65-0.90, elongation after fracture is 18-29%, and the ballistic work under the conditions of 0 DEG C is 120-320J.
By above-mentioned technical proposal, the performance parameter for matching produced reinforcing bar according to said components within the range,
The reinforcing bar of the parameter area mechanical property and meet standard simultaneously and can to a certain extent be better than standard.
The present invention is further arranged to：The slit and corrosion resistant reinforcing bar high has tiny tempered sorbite tissue.
By above-mentioned technical proposal, tempered sorbite is the machine that the ferrite and carbide for obtaining is tempered at 500 DEG C or so
Tool mixture is referred to as tempered sorbite, has good toughness and plasticity in its performance, while having intensity higher.
A kind of preparation method of slit and corrosion resistant reinforcing bar high of another goal of the invention of the invention：It is described including said components
Preparation process is as follows：
Step 1：Desulfurizing agent is added in molten iron carries out desulfurization pretreatment；
Step 2：Converter dephosphorization；
Step 3：Continuous casting, the molten steel that will be obtained in step 2 is cast under a shielding gas, obtains continuous casting billet, and strand is added
Heat, required size is compressed to by the strand of gained；
Step 4：Heat treatment, through normalizing, quenching, tempering process；
Normalizing：880 DEG C~930 DEG C insulations are heated to the speed of 60~90 DEG C/h, 240~300min of soaking time is then cold
Bed is air cooled to room temperature；
Quenching：860~910 DEG C of insulations, 300~400min of soaking time, subsequent water-cooled are heated to the speed of 60~90 DEG C/h
To room temperature；
Tempering：500~550 DEG C of insulations, 400~500min of soaking time, subsequent cold bed are heated to the speed of 60~90 DEG C/h
It is air cooled to room temperature.
By above-mentioned technical proposal, desulfurization is carried out to molten iron, the reduction element sulphur and P elements that dephosphorization treatment can be effective
Excessive presence and harmful effect caused in reinforcing bar, and heat treatment process is by produced by normalizing, the processing procedure of quenching
Tissue uniform small grains, and with the ferrite of certain content, improve the temper resistance of tissue, prolonged high
Good impact flexibility is kept after temperature tempering, the use requirement under more harsh conditions is met.
The present invention is further arranged to：The temperature of the strand in the step 3 is heated to 1100~1200 DEG C.
By above-mentioned technical proposal, the strand for being produced under this condition wherein contains a small amount of impurity.
The present invention is further arranged to：The temperature of the cold bed in the step 4 is 900~950 DEG C.
By above-mentioned technical proposal, be ensure that using cold bed air cooling production reinforcing bar it is straight, and temperature control exists
In the range of can realize quick cooling, and can to a certain extent avoid the reinforcing bar caused by the generation of thermograde microcosmic
That organizes is uneven.
In sum, having the beneficial effect that in contrast to prior art of the invention：
1st, the Si elements and Cr elements that are added in component use cooperatively the decay resistance that can improve stainless steel, and work as Si units
The decay resistance of stainless steel can be equally improved when element and P element collective effect；
Although the reduction of stainless steel decay resistance the 2, is caused in component during Cr and C mating reactions, by the content of C in the present invention
Control enables to the decrement control lowest range of the corrosion resistance of stainless steel product in a rational scope；
3rd, the decay resistance of stainless steel is obviously improved when Mo, Ni, Cr three in component use cooperatively；4th, resistance to seam high
Gap corrosion reinforcing bar is tempered sorbite tissue, and it keeps good performance in corrosion resistance, intensity, welding performance each side；
5th, the slit and corrosion resistant reinforcing bar high produced using the preparation method in the present invention has good impact flexibility, compared with
The impurity of few content, the function admirable of product.
Brief description of the drawings
Fig. 1 is the metallographic structure figure of embodiment 10.
Specific embodiment
The present invention is described in further detail with reference to embodiments.
A kind of slit and corrosion resistant reinforcing bar high
Each component in embodiment 1-6 and comparative example, count by weight percentage.
Embodiment 1
A kind of slit and corrosion resistant reinforcing bar high, is prepared from by the raw material of following weight percent content：C 0.015, Si
0.15%, Mn 0.7%, P 0.014%, S 0.007%, Cr 8%, Ni 0.3%, Mo 0.1%, remaining is iron.
Embodiment 2
A kind of slit and corrosion resistant reinforcing bar high, is prepared from by the raw material of following weight percent content：C 0.017%, Si
0.2%, Mn 0.75%, P 0.013%, S 0.006%, Cr 9%, Ni 0.4%, Mo 0.11%, remaining is iron.
Embodiment 3
A kind of slit and corrosion resistant reinforcing bar high, is prepared from by the raw material of following weight percent content：C 0.019%, Si
0.3%, Mn 0.78%, P 0.012%, S 0.005%, Cr 9.5%, Ni 0.5%, Mo 0.5%, remaining is iron.
Embodiment 4
A kind of slit and corrosion resistant reinforcing bar high, is prepared from by the raw material of following weight percent content：C 0.021%, Si
0.35%, Mn 0.8%, P 0.011%, S 0.004%, Cr 10%, Ni 0.55%, Mo 0.13%, remaining is iron.
Embodiment 5
A kind of slit and corrosion resistant reinforcing bar high, is prepared from by the raw material of following weight percent content：C 0.023%, Si
0.4%, Mn 0.85%, P 0.01%, S 0.003%, Cr 11%, Ni 0.6%, Mo 0.14%, remaining is iron.
Embodiment 6
A kind of slit and corrosion resistant reinforcing bar high, is prepared from by the raw material of following weight percent content：C 0.025%, Si
0.45%, Mn 0.9%, P 0.009%, S 0.002%, Cr 12%, Ni 0.7%, Mo 0.15%, remaining is iron.
A kind of preparation method of slit and corrosion resistant reinforcing bar high
Embodiment 7
The slit and corrosion resistant reinforcing bar high includes the component in embodiment 1, and preparation process is as follows：
Step 1：Desulfurizing agent is added in molten iron carries out desulfurization pretreatment；
Step 2：Converter dephosphorization；
Step 3：Continuous casting, the molten steel that will be obtained in step 2 is cast under a shielding gas, obtains continuous casting billet, and strand is added
Heat, temperature is heated to 1100 DEG C, and the strand of gained is compressed into required size；
Step 4：Heat treatment, through normalizing, quenching, tempering process；
Normalizing：880 DEG C of insulations are heated to the speed of 60 DEG C/h, soaking time 240min, subsequent cold bed is air cooled to room temperature, cold bed
Temperature is 900 DEG C；
Quenching：860 DEG C of insulations, soaking time 300min, subsequent water-cooled to room temperature are heated to the speed of 60 DEG C/h；
Tempering：500 DEG C of insulations are heated to the speed of 60 DEG C/h, soaking time 400min, subsequent cold bed is air cooled to room temperature, cold bed
Temperature is 500 DEG C.
Embodiment 8
The slit and corrosion resistant reinforcing bar high includes the component in embodiment 2, and preparation process is as follows：
Step 1：Desulfurizing agent is added in molten iron carries out desulfurization pretreatment；
Step 2：Converter dephosphorization；
Step 3：Continuous casting, the molten steel that will be obtained in step 2 is cast under a shielding gas, obtains continuous casting billet, and strand is added
Heat, temperature is heated to 1120 DEG C, and the strand of gained is compressed into required size；
Step 4：Heat treatment, through normalizing, quenching, tempering process；
Normalizing：890 DEG C of insulations are heated to the speed of 70 DEG C/h, soaking time 250min, subsequent cold bed is air cooled to room temperature, cold bed
Temperature is 910 DEG C；
Quenching：870 DEG C of insulations, soaking time 320min, subsequent water-cooled to room temperature are heated to the speed of 70 DEG C/h；
Tempering：510 DEG C of insulations are heated to the speed of 70 DEG C/h, soaking time 420min, subsequent cold bed is air cooled to room temperature, cold bed
Temperature is 520 DEG C.
Embodiment 9
The slit and corrosion resistant reinforcing bar high includes the component in embodiment 3, and preparation process is as follows：
Step 1：Desulfurizing agent is added in molten iron carries out desulfurization pretreatment；
Step 2：Converter dephosphorization；
Step 3：Continuous casting, the molten steel that will be obtained in step 2 is cast under a shielding gas, obtains continuous casting billet, and strand is added
Heat, temperature is heated to 1140 DEG C, and the strand of gained is compressed into required size；
Step 4：Heat treatment, through normalizing, quenching, tempering process；
Normalizing：900 DEG C of insulations are heated to the speed of 75 DEG C/h, soaking time 270min, subsequent cold bed is air cooled to room temperature, cold bed
Temperature is 920 DEG C；
Quenching：880 DEG C of insulations, soaking time 340min, subsequent water-cooled to room temperature are heated to the speed of 75 DEG C/h；
Tempering：520 DEG C of insulations are heated to the speed of 75 DEG C/h, soaking time 440min, subsequent cold bed is air cooled to room temperature, cold bed
Temperature is 540 DEG C.
Embodiment 10
The slit and corrosion resistant reinforcing bar high includes the component in embodiment 4, and preparation process is as follows：
Step 1：Desulfurizing agent is added in molten iron carries out desulfurization pretreatment；
Step 2：Converter dephosphorization；
Step 3：Continuous casting, the molten steel that will be obtained in step 2 is cast under a shielding gas, obtains continuous casting billet, and strand is added
Heat, temperature is heated to 1160 DEG C, and the strand of gained is compressed into required size；
Step 4：Heat treatment, through normalizing, quenching, tempering process；
Normalizing：910 DEG C of insulations are heated to the speed of 80 DEG C/h, soaking time 280min, subsequent cold bed is air cooled to room temperature, cold bed
Temperature is 930 DEG C；
Quenching：890 DEG C of insulations, soaking time 360min, subsequent water-cooled to room temperature are heated to the speed of 80 DEG C/h；
Tempering：530 DEG C of insulations are heated to the speed of 80 DEG C/h, soaking time 460min, subsequent cold bed is air cooled to room temperature, cold bed
Temperature is 550 DEG C.
Embodiment 11
The slit and corrosion resistant reinforcing bar high includes the component in embodiment 5, and preparation process is as follows：
Step 1：Desulfurizing agent is added in molten iron carries out desulfurization pretreatment；
Step 2：Converter dephosphorization；
Step 3：Continuous casting, the molten steel that will be obtained in step 2 is cast under a shielding gas, obtains continuous casting billet, and strand is added
Heat, temperature is heated to 1180 DEG C, and the strand of gained is compressed into required size；
Step 4：Heat treatment, through normalizing, quenching, tempering process；
Normalizing：920 DEG C of insulations are heated to the speed of 85 DEG C/h, soaking time 290min, subsequent cold bed is air cooled to room temperature, cold bed
Temperature is 940 DEG C；
Quenching：900 DEG C of insulations, soaking time 380min, subsequent water-cooled to room temperature are heated to the speed of 85 DEG C/h；
Tempering：540 DEG C of insulations are heated to the speed of 85 DEG C/h, soaking time 480min, subsequent cold bed is air cooled to room temperature, cold bed
Temperature is 560 DEG C.
Embodiment 12
The slit and corrosion resistant reinforcing bar high includes the component in embodiment 6, and preparation process is as follows：
Step 1：Desulfurizing agent is added in molten iron carries out desulfurization pretreatment；
Step 2：Converter dephosphorization；
Step 3：Continuous casting, the molten steel that will be obtained in step 2 is cast under a shielding gas, obtains continuous casting billet, and strand is added
Heat, temperature is heated to 1200 DEG C, and the strand of gained is compressed into required size；
Step 4：Heat treatment, through normalizing, quenching, tempering process；
Normalizing：930 DEG C of insulations are heated to the speed of 90 DEG C/h, soaking time 300min, subsequent cold bed is air cooled to room temperature, cold bed
Temperature is 950 DEG C；
Quenching：910 DEG C of insulations, soaking time 400min, subsequent water-cooled to room temperature are heated to the speed of 90 DEG C/h；
Tempering：550 DEG C of insulations are heated to the speed of 90 DEG C/h, soaking time 500min, subsequent cold bed is air cooled to room temperature, cold bed
Temperature is 580 DEG C.
The slit and corrosion resistant steel muscle performance detection high of embodiment 7-12
1st, mechanics properties testing
Yield strength：It is measured according to the method that standard GB228-87 specifies；
Tensile strength：It is measured according to the method that standard GBT 228.1-2010 specify；
Method of testing：
1. reinforcing bar former material is stretched into rust cleaning；
2. sample is intercepted by following requirement：D=25, the minimum drift between specimen holder is 350mm；25 ＜ d≤32, examination
Minimum drift between sample fixture is 400mm；32 ＜ d≤50, the minimum drift between specimen holder is 500mm；
3. sample is demarcated into gauge length with steel bar gauge length instrument；
4. sample is put into clamp for universal testing machine, closes oil return valve, and clamping device, open machine；
5. universal testing machine scale is conscientiously observed in process of the test, and payload values when pointer is rotated counterclockwise first are in the wrong
Load is taken, the load is recorded；
6. continue to stretch, until sample is broken, the maximum that pointer is pointed to is failing load, records the load.
Yield tensile ratio=yield strength/tensile strength；
Elongation after fracture：The method specified using standard GB/T228-2002 is detected；
Ballistic work：The specification of embodiment 7-12 is selected respectively for the reinforcing bar of 5mm*10mm*55mm is detected, using Charpy impact
Testing machine JB-300B is determined, and every group of five groups of same reinforcing bars of embodiment selection specification are measured.
The mechanics properties testing result of the embodiment 7-12 of table 1
Can be drawn by the data of above table, the testing result of embodiment 7-12 can meet the model of national standard defined
Enclose.
2nd, decay resistance is determined
Experimental program：Slit and corrosion resistant reinforcing bar high produced in above-described embodiment 7-12 is selected into an equal amount of specification difference
It is placed in the container of same size, in the case that Control release is consistent, adds 5%NaCl+0.5%CH3The experiment of COOH
Solution, the pH of solution is maintained at 2.6-2.8, slit and corrosion resistant reinforcing bar high is corroded, and experimental period is 168h.Experiment terminates
After scrape iron rust and do experimental analysis, determine corrosion weight loss and corrosion rate.
The decay resistance determination experiment result of the embodiment 7-12 of table 2
By above table it can be seen that with the corrosion weight loss and corrosion rate that gradually increase embodiment 7-12 of constituent content
Presentation first rises the variation tendency for reducing afterwards, analyzes list data, and the corrosion weight loss minimum of embodiment 10 then illustrates that its is corrosion-resistant
Best performance, and the corrosion rate of embodiment 10 is also minimum, then illustrate that the corrosion rate of embodiment 10 is most slow, then embodiment 10
In slit and corrosion resistant reinforcing bar high corrosion resistance it is optimal, it is advantageous to embodiment 10 as present specification optimal implementation
Example.
3rd, the measure of metallurgical structure
1st, slit and corrosion resistant reinforcing bar high prepares metallographic sample in selection embodiment 10；
2nd, metallographic structure observation is carried out under metallographic microscope.
As shown in figure 1, by observing the architectural feature in figure, finding its structure figure for meeting tempered sorbite, institute
There is good toughness, plasticity and intensity in performance with the slit and corrosion resistant reinforcing bar high of embodiment 10；Due to embodiment 7-9 and
Embodiment 11 and 12 and the small variations that embodiment 10 is in component, so its metallograph is basically identical with Fig. 1, Gu do not do in detail
Describe in detail bright.
Comparative example 1
Comparative example 1 selects the corrosion resisting steel of 20MnSiV, and Performance comparision is carried out with embodiment 10；
Comparative example 2
Comparative example 2 selects the corrosion resisting steel of 20CrMo, and Performance comparision is carried out with embodiment 10.
Experiment detection
1st, the mechanics properties testing of comparative example 1-2
Examination criteria according to embodiment 7-12 is detected to the mechanical property of comparative example 1-2.
The mechanics properties testing result of the comparative example 1-2 of table 3
| Detection project | Comparative example 1 | Comparative example 2 | Embodiment 10 |
| Yield strength/MPa | 451 | 695 | 648 |
| Tensile strength/MPa | 591 | 885 | 877 |
| Yield tensile ratio | 0.76 | 0.79 | 0.74 |
| Elongation after fracture/% | 26 | 17 | 21 |
| Ballistic work/J | 213 | 225 | 228 |
Can significantly be drawn by above table, comparative example 10 and comparative example 1, the mechanical property of embodiment 10 is obvious
Better than comparative example 1, comparative example 10 and comparative example 2, yield tensile ratio is smaller, then the plasticity of material is better, and material is rushed
Hit work(and be also greater than comparative example 2, so some performances of embodiment 10 are also better than comparative example 2.
2nd, decay resistance is determined
According to the corrosion weight loss and corrosion rate of the examination criteria comparative example 1 and 2 of embodiment 7-12.
The decay resistance determination experiment result of the comparative example 1 and 2 of table 4.
| Test event | Comparative example 1 | Comparative example 2 | Embodiment 10 |
| Corrosion weight loss g/cm2 | 0.055 | 0.04 | 0.015 |
| Corrosion rate g/cm2h | 0.00035 | 0.00023 | 0.00014 |
Slit and corrosion resistant reinforcing bar high in present specification can be seen that in corruption by contrast and the above-mentioned experimental result of analysis
Result in terms of erosion weightlessness and corrosion rate will be significantly lower than 20MnSiV and 20CrMo, and can by analyzing experimental result
With the corrosion resistance for drawing the slit and corrosion resistant reinforcing bar high in present specification 60% is improve than traditional 20MnSiV reinforcing bars
More than, it is more excellent that experimental result can illustrate that the slit and corrosion resistant reinforcing bar high in present specification has compared with prior art
Decay resistance.
The above is only exemplary embodiment of the invention, not for limiting the scope of the invention, this hair
Bright protection domain is determined by appended claim.
Claims (10)
1. a kind of slit and corrosion resistant reinforcing bar high, it is characterized in that：It is prepared from by the raw material of following weight percent content：
C0.005-0.04、Si0.15-0.45、Mn0.5-1.2、P≤0.014、S≤0.007、Cr8.0-12.0、Ni0.3-0.7、
Mo0.05-0.25, remaining be Fe.
2. a kind of slit and corrosion resistant reinforcing bar high according to claim 1, it is characterized in that：The percentage by weight of the C is
0.015-0.025%。
3. a kind of slit and corrosion resistant reinforcing bar high according to claim 2, it is characterized in that：The percentage by weight of the Mn is
0.7-0.9%。
4. a kind of slit and corrosion resistant reinforcing bar high according to claim 3, it is characterized in that：The percentage by weight of the Mo is
0.1-0.15%。
5. a kind of slit and corrosion resistant reinforcing bar high according to claim 4, it is characterized in that：By following weight percent content
Raw material is prepared from：C 0.015-0.025、Si 0.15-0.45、Mn 0.7-0.9、P ≤ 0.014、S ≤ 0.007、Cr
8.0-12.0, Ni 0.3-0.7, Mo 0.1-0.15, remaining be Fe and inevitable impurity.
6. the slit and corrosion resistant reinforcing bar a kind of high according to the claims 5, it is characterized in that：Yield strength is 400-
800MPa, tensile strength is 530-950 MPa, and yield tensile ratio is 0.65-0.90, and elongation after fracture is 18-29%, under the conditions of 0 DEG C
Ballistic work is 120-320J.
7. the slit and corrosion resistant reinforcing bar a kind of high according to the claims 5, it is characterized in that：The slit and corrosion resistant reinforcing bar high
With tiny tempered sorbite tissue.
8. a kind of preparation method of slit and corrosion resistant reinforcing bar high, it is characterised in that comprising the component in the claims 5, institute
State preparation process as follows：
Step 1：Desulfurizing agent is added in molten iron carries out desulfurization pretreatment；
Step 2：Converter dephosphorization；
Step 3：Continuous casting, the molten steel that will be obtained in step 2 is cast under a shielding gas, obtains continuous casting billet, and strand is added
Heat, required size is compressed to by the strand of gained；
Step 4：Heat treatment, through normalizing, quenching, tempering process；
Normalizing：880 DEG C ~ 930 DEG C insulations, 240 ~ 300min of soaking time, subsequent cold bed are heated to the speed of 60 ~ 90 DEG C/h
It is air cooled to room temperature；
Quenching：860 ~ 910 DEG C are heated to the speed of 60 ~ 90 DEG C/h to be incubated, 300 ~ 400min of soaking time, subsequent water-cooled is extremely
Room temperature；
Tempering：500 ~ 550 DEG C of insulations, 400 ~ 500min of soaking time, subsequent cold bed air cooling are heated to the speed of 60 ~ 90 DEG C/h
To room temperature.
9. the preparation method of the slit and corrosion resistant reinforcing bar a kind of high according to aforesaid right wants 8, it is characterized in that, the step 3
In the temperature of strand be heated to 1100 ~ 1200 DEG C.
10. the preparation method of the slit and corrosion resistant reinforcing bar a kind of high according to aforesaid right wants 8, it is characterized in that, the step 4
In the temperature of cold bed of normalizing be 900 ~ 950 DEG C, the cold bed temperature of tempering is 500 ~ 580 DEG C.
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