CN106498288A - A kind of steel band of seawater corrosion resistance containing Ti and preparation method thereof - Google Patents
A kind of steel band of seawater corrosion resistance containing Ti and preparation method thereof Download PDFInfo
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- CN106498288A CN106498288A CN201611186727.9A CN201611186727A CN106498288A CN 106498288 A CN106498288 A CN 106498288A CN 201611186727 A CN201611186727 A CN 201611186727A CN 106498288 A CN106498288 A CN 106498288A
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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
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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Abstract
A kind of steel band of seawater corrosion resistance containing Ti and preparation method thereof, category low-alloy steel manufacture field；Steel band chemical composition and weight/mass percentage composition are：C：0.02～0.15%, Si：0.2～0.4%, Mn：0.8～1.5%, P：0.07～0.1%, S≤0.005%, Cu：0.2～0.5%, Ti：0.15～0.4%, V：0～0.06%, Ni：0～0.4%, balance of Fe and other inevitable impurity elements；Thickness is 4～7mm；Preparation method：1) continuous casting billet is prepared；2) by continuous casting billet, austenitizing is heated to；3) first roughing, then finish rolling；4) by finish rolling steel band, batch after section cooling, be finally air cooled to room temperature, seawater corrosion resistance steel band is obtained；Steel band composition of the present invention is unique, with good corrosivity and corrosion fatigue resistant performance；Preparation method is not required to be tempered, can the rolled supply of material, in more than 435MPa, in more than 540MPa, elongation percentage is more than 35% to tensile strength, and 40 DEG C of Charpy-V impact powers are more than 48J for the yield strength of steel plate.
Description
Technical field
The invention belongs to low-alloy steel manufactures field, more particularly to a kind of steel band of seawater corrosion resistance containing Ti and its preparation
Method.
Background technology
Ocean is the commanding elevation of 21 century world politics, economy, military competition.For the purpose of to greatest extent using ocean
Scientific research of seas, marine technology exploitation etc. have been raised to the Strategic planning and decision-making category of various countries' highest level.The ten of party
Eight big reports are proposed and " improve marine resources development ability, Development of Marine economy is protected the marine eco-environment, determines to safeguard state
The development strategy of family's maritime rights and interests, construction ocean power ".Marine resources development ability is improved, national marine rights and interests are determined to safeguard,
Build ocean power, it is necessary to Development of Marine engineer equipment, develop advanced marine material and its application technology, especially large usage quantity
Advanced steel structure material research and development.
Due to the corrosive power that the media such as marine atmosphere seawater are strong, should not be flat using conventional low alloy steels Yu Haiyang
The construction of the large scale structures such as platform, marine wind electric field, but traditional stainless steel can then bring high cost.Traditional weathering steel is produced
Product make welding performance and resistance to due to metallic element Cr, Ni containing more costliness in component system simultaneously containing higher C
Corrosive nature declines, while production cost is higher, constrains the development and application of weathering steel.Using the corrosion-resistant of low-alloy composition
Steel, on the premise of cost is not greatly improved can significantly improve decay resistance, thus corten is in ocean engineering
In be widely applied.And widely used low-alloy steel or micro alloyed steel, it is long-term used in the ocean engineering of marine environment
Material mainly improves steel by the interpolation such as various microalloy elements such as Cu, P, Cr, Ni in addition to application and cathodic protection mode
The strength and toughness of material and corrosion resistance.Although the protected mode of various microalloy elements is widely studied, but for micro- containing Ti
Steel alloy, the addition of Ti are a lot of to the crystal grain refinement of steel and precipitation strength researcher, for the research containing Ti weathering steels, especially
It is the research of the corrosion resisting property and mechanism for high Ti without Ni, Cr content weathering steel, and systematic be not suggested and report.Cause
This, exploitation Marine Engineering Steel new product Seawate-corrosive-resisting steel containing Ti has significant economic benefit and social benefit.
Domestic sea water resistance steel and its manufacture method declare multinomial patent so far.
For example, publication number CN1013192993A, a kind of Seawate-corrosive-resisting steel and its production technology, describe a kind of Cr-
The Seawate-corrosive-resisting steel of Mo-Al systems, without Ni elements, a certain degree of reduce cost, and ensure that decay resistance.But
Higher Al content (0.45～0.6%) can bring series of problems, and smelting molten steel difficulty is big, easily makes steel internal quality of steel plate not
Qualified, and reduce can armor plate strength.And the steel is also not added with Cu elements, can there is a problem of ibid.
The patent of publication number CN102534378 A, the structure for describing a kind of uniform seawater corrosion resistance of metallographic structure are used
Steel and its production method.The steel adds a small amount of tiny alloying element Ti≤0.0048%, and carbon content higher (0.05～
0.45%), micro Ti elements can be fixed by carbon completely, but because carbon content is higher, is understood some cementite and separated out,
It is difficult to obtain the uniform microscopic structure of metallographic structure completely, the decay resistance of steel is affected.And the steel does not add corrosion resistant
The good Cu elements of corrosion, it is impossible to ensure its corrosion resisting property in marine environment structural member, its decay resistance will certainly be affected.
103741057 A of publication number CN, a kind of low-density height steel plate of resistance to marine environment and its production technology, introduce
A kind of low density steel containing aluminium 0.1～2.0%, reduces the density of steel plate, it is achieved that structure loss of weight.But the steel plate adds
The Cu elements of very small amount 0.04% or so, are not reaching to the addition of the 0.2～0.4% of corrosion-resistant requirement Cu, but add
Cr, Ni, Al total content improves decay resistance in 0.3～1.5% or so alloying element, so can not only improve material
Cost, and corrosion resistance can reach the anticorrosion effect suitable with Cu elements are added.
Publication number CN 101029372A, a kind of Seawate-corrosive-resisting steel and its production method, describe a kind of Cu-Cr-Mo systems
And the Seawate-corrosive-resisting steel that micro- Ca (0.0015～0.004%) is processed, without precious metal Ni elements, cost is reduced, but
Add micro Ca, although the corrosion resisting property of steel can be improved and be also beneficial to improve the toughness of steel and ensure mechanical property
Isotropism, but to add Ca in terms of smelting be highly difficult, and and content is difficult to control, and is difficult to realize.Describe one kind to adopt
With the composition design scheme of the elements such as Ultra-low carbon (0.01～0.04%) plus Cu, Cr, Ni, Nb, Ti, using two-phase control rolling, roll
To room temperature, the heat treatment step for then carrying out quenching and tempering is produced air cooling afterwards.Although obtain higher yield strength
And preferable decay resistance, but the rolled supply of material cannot be met, and follow-up heat treatment step is increased, long the production cycle is raw
Produce high cost.
Publication number CN 103966509A, a kind of steel plate of resistance to marine environment and preparation method thereof, describe a kind of carbon
The low-carbon (LC) corrosion-resisting steel of content 0.1～0.16%, carbon content be not relatively low, produces ferritic structure by the big pressure of high temperature, but
Ferrite crystal grain is more thick, and yield strength is extremely difficult to 500MPa.The invention to be referred to and improve field trash by Calcium treatment technology
Type does not refer to content and the adding method of calcium so as to improve in decay resistance, but invention, this 2 points is precisely difficult point.
101319293 A of publication number CN, a kind of Seawate-corrosive-resisting steel and its production technology, describe a kind of Cr, Mo, Al
It is corrosion-resisting steel.The content of the steel plate manganese is relatively low, and therefore yield strength is relatively low, in 295～380MPa, it is difficult to meet now to high-strength
The demand of degree weathering steel.
Content of the invention
For the deficiencies in the prior art, the invention provides a kind of steel band of seawater corrosion resistance containing Ti and preparation method thereof；Mesh
Be to provide a kind of Seawate-corrosive-resisting steel of new high Ti contents and its production technology, using Ti fix steel in C, N element, obtain
The uniformly single microscopic structure of steel containing Ti is arrived, intrinsic silicon potential difference is less, advantageously reduces corrosion rate, improves corrosion-resistant
Property.The steel has good corrosive nature and high intensity in marine environment, can meet the requirement of Marine Engineering Steel.
The steel band of seawater corrosion resistance containing Ti of the present invention, its chemical composition and its weight/mass percentage composition are：C：0.02～
0.15%, Si：0.2～0.4%, Mn：0.8～1.5%, P：0.07～0.1%, S≤0.005%, Cu：0.2～0.5%, Ti：
0.15～0.4%, V：0～0.06%, Ni：0～0.4%, balance of Fe and other inevitable impurity elements.
The steel band of seawater corrosion resistance containing Ti of the present invention, its thickness are 4～7mm.
The steel band of seawater corrosion resistance containing Ti of the present invention, its organization type include individual event polygonal ferrite and pearlite group
Knit：Wherein, by volumn concentration, individual event polygonal ferrite is 90～95%, and pearlitic structrure is 5～10%.
The steel band of seawater corrosion resistance containing Ti of the present invention, it be by force 435～480MPa which is surrendered, and tensile strength is 540～
610MPa, elongation after fracture are 35～40%%, and -40 DEG C of Charpy-V impact powers are more than or equal to 48～62J.
The preparation method of the steel band of seawater corrosion resistance containing Ti of the present invention, comprises the steps：
Step 1, by the chemical composition proportioning of seawater corrosion resistance steel band, prepares continuous casting billet；
Step 2, austenitizing：
By continuous casting billet, it is heated to 1200～1280 DEG C and is incubated to continuous casting billet austenitizing；
Step 3, two-stage control are rolled：
(1) roughing：By the continuous casting billet of austenitizing, roughing is carried out, roughing steel plate is obtained；Wherein, start rolling temperature is 1150
～1200 DEG C, roughing accumulation reduction ratio is 70～82%；
(2) finish rolling：By roughing plate, finish rolling is carried out, finish rolling steel band is obtained；Wherein, start rolling temperature is 980～1000 DEG C, essence
Finishing temperature is rolled for 850～870 DEG C, finish rolling accumulation reduction ratio is 85～95%；
Step 4, cools down and batches：
By finish rolling steel band, section cooling, then batched with 580～650 DEG C of temperature, be finally air cooled to room temperature, be obtained and contain
Ti seawater corrosion resistance steel bands.
In the preparation method of above-mentioned seawater corrosion resistance steel band：
In the step 1, the concrete grammar for preparing continuous casting billet is, using the deeply de- S of the molten iron, (control of converter top bottom blowing
C content processed), RH vacuum circulation degassing techniques, whole process molding casting；With double roller continuous casting, through confined space, continuous casting is prepared
Base.
In the step 1, thickness of strand is 180～230mm.
In the step 2, temperature retention time is 3～4h.
In the step 2, continuous casting billet austenitizing criterion is that the volumn concentration of austenite is 80 in its tissue
～100%.
In the step 3,3～5 passage roughing are carried out altogether, single pass reduction ratio is 25～40%.
In the step 3, roughing is carried out using single stand four-roller reversable mill.
In the step 3,7～9 passage finish rolling are carried out altogether, the accumulative reduction ratio of 3 passages is 45～60% afterwards.
In the step 3, finish rolling is carried out using 7 frame, four roll reversing roller.
In the step 4, cooling velocity is 20～30 DEG C/s.
Compared with existing weathering steel, steel band of seawater corrosion resistance containing Ti of the present invention and preparation method thereof, beneficial effect is：
1. the steel band composition that the present invention is manufactured is unique, reduces C content, adds Ti elements, and Ti contents are reached as high as
0.4%, due to Ti elements corrosion resisting property itself excellent so that the resistance to ocean zones of different of the steel plate that produces of the present invention such as full leaching
The corrosive nature in area, a leaching and marine atmosphere obtains larger raising；There is good corrosion fatigue resistant performance again, can be well
Meet the requirement that people are applied in terms of ocean engineering；
2. the steel plate that the present invention is manufactured is organized as individual event polygonal ferrite or containing minimal amount of pearlitic structrure,
Its even tissue, the more conventional ferrite+pearlitic structrure of its corrosion resisting property have obvious advantage；
3. the corrosion-resisting steel that the present invention is provided belongs to high-strength corrosion-resistant steel, and its yield strength is in more than 435MPa, tensile strength
In more than 540MPa, elongation percentage is more than 35%, and -40 DEG C of Charpy-V impact powers become more than 48J, the development for adapting to steel products minimizing
Gesture；
4. the production technology of steel of the present invention is two-stage control rolling, is conducive to the tissue for obtaining fine uniform, improves steel
Strong plasticity and low-temperature flexibility.Tempering heat treatment need not be carried out, can rolled the supply of material, reduce production cost.
Description of the drawings
The steel band of seawater corrosion resistance containing Ti of Fig. 1 embodiment of the present invention 1～4 is with the corrosion weight loss of reference Q345 steel bands with corrosion
The relation curve of mechanical periodicity；
The steel band of seawater corrosion resistance containing Ti of Fig. 2 embodiment of the present invention 2 corrodes the electric polarization curve of different cycles；
The steel band of seawater corrosion resistance containing Ti of Fig. 3 embodiment of the present invention 3 corrodes the electric polarization curve of different cycles；
The steel band of seawater corrosion resistance containing Ti of Fig. 4 embodiment of the present invention 4 corrodes the electric polarization curve of different cycles；
The electric polarization curve of the corrosion different cycles of Fig. 5 reference Q345 steel bands；
The microstructure morphology of the steel band of seawater corrosion resistance containing Ti of Fig. 6 embodiment of the present invention 1；
The microstructure morphology of the steel band of seawater corrosion resistance containing Ti of Fig. 7 embodiment of the present invention 2；
The microstructure morphology of the steel band of seawater corrosion resistance containing Ti of Fig. 8 embodiment of the present invention 3；
The microstructure morphology of the steel band of seawater corrosion resistance containing Ti of Fig. 9 embodiment of the present invention 4；
Secondary electron image after the steel band of seawater corrosion resistance containing the Ti corrosion 480h of Figure 10 embodiment of the present invention 2；
Secondary electron image after the steel band of seawater corrosion resistance containing the Ti corrosion 480h of Figure 11 embodiment of the present invention 3；
Secondary electron image after the steel band of seawater corrosion resistance containing the Ti corrosion 480h of Figure 12 embodiment of the present invention 4；
Secondary electron image after Figure 13 reference Q345 steel bands corrosion 480h.
Specific embodiment
The reference steel that following examples are related to is Q345 steel bands, and its composition and its weight/mass percentage composition are：C：0.17%,
Si：0.19%, Mn：1.06%, P：0.015%, S：0.0058%, Cu：0.025%, balance of Fe and other are inevitable
Impurity element, its thickness are 5mm.The electric polarization curve which corrodes different cycles is as shown in Figure 5；Secondary electron image such as Figure 13 institutes
Show.
Embodiment 1
A kind of steel band of seawater corrosion resistance containing Ti, its chemical composition and its weight/mass percentage composition are：C：0.03%, Si：
0.198%, Mn：0.92%, P：0.005%, S：0.003%, Cu：0.36%, Ti：0.27%, Ni：0.35%, balance of Fe
And other inevitable impurity elements；Its thickness is 4.5mm.
The preparation method of the above-mentioned steel band of seawater corrosion resistance containing Ti, comprises the steps：
Step 1, by the chemical composition proportioning of the steel band of seawater corrosion resistance containing Ti, using the deeply de- S of molten iron, converter top bottom is compound to blow
Refining (control C content), RH vacuum circulation degassing techniques, whole process molding casting；With double roller continuous casting, through confined space, prepare
Go out the continuous casting billet that thickness is 230mm；
Step 2, austenitizing：
By continuous casting billet, 1250 DEG C of insulation 4h are heated to, to continuous casting billet austenitizing；
Step 3, two-stage control are rolled：
(1) roughing：By the continuous casting billet of austenitizing, using single stand four-roller reversable mill, 5 passage roughing are carried out, be obtained
Roughing steel plate；Wherein, start rolling temperature is 1170 DEG C, and roughing accumulation reduction ratio is 82%；
(2) finish rolling：By roughing plate, using 7 frame, four roll reversing roller, 8 passage finish rolling are carried out, finish rolling steel band is obtained；Its
In, start rolling temperature is 1000 DEG C, and finish rolling finishing temperature is 870 DEG C, and finish rolling accumulation reduction ratio is 89%, afterwards 3 percentage pass reductions point
Wei 35%, 30% and 24%；
Step 4, cools down and batches：
By finish rolling steel band, with the cooling velocity section cooling of 25 DEG C/s, then batched with 620 DEG C of temperature, last air cooling
To room temperature, the steel band of seawater corrosion resistance containing Ti is obtained.
The atmospheric corrosion resistance test of the steel band of seawater corrosion resistance containing Ti manufactured in the present embodiment：Tried with Q345 steel as reference
Sample, is simulated accelerated corrosion tests using period soaking corrosion test box, and solution is using 3.5%NaCl solution (simulation ocean
Corrosive environment) accelerated corrosion test.Aqueous temperature is controlled at 45 DEG C, and in experimental box, baking temperature is controlled at 70 DEG C, wet in case
Spend for 70%.Each soak cycles is 1h, and wherein soak time is 0.2h, and drying time is 0.8h, and experiment carries out 480h altogether.
0h after experiment starts respectively, 72h, 144h, 216h, 264h, 360h, 480h sampling carries out morphology observation, weightless measurement and corruption
Erosion product analysis；It is bent with the relation of etching time that weighing data according to sample after different cycles corrosion draws out corrosion weight loss
Line, is shown in Fig. 1；
The steel band of seawater corrosion resistance containing Ti manufactured in the present embodiment, its organization type include individual event polygonal ferrite and pearly-lustre
Body is organized, and microstructure morphology is as shown in Figure 6, it is seen that, by volumn concentration, individual event polygonal ferrite is 90%, pearly-lustre
Body is organized as 10%.
The steel band of seawater corrosion resistance containing Ti manufactured in the present embodiment, its yield strength are 435MPa, and tensile strength is 595MPa,
Elongation after fracture is 36.8%, and -40 DEG C of Charpy-V impact powers are more than or equal to 56J.
Embodiment 2
A kind of steel band of seawater corrosion resistance containing Ti, its chemical composition and its weight/mass percentage composition are：C：0.036%, Si：
0.26%, Mn：0.98%, P：0.096%, S：0.001%, Cu：0.34%, Ti：0.38%, balance of Fe and other can not keep away
The impurity element that exempts from；Its thickness is 5.0mm.
The preparation method of the above-mentioned steel band of seawater corrosion resistance containing Ti, comprises the steps：
Step 1, by the chemical composition proportioning of the steel band of seawater corrosion resistance containing Ti, using the deeply de- S of molten iron, converter top bottom is compound to blow
Refining (control C content), RH vacuum circulation degassing techniques, whole process molding casting；With double roller continuous casting, through confined space, prepare
Go out the continuous casting billet that thickness is 230mm；
Step 2, austenitizing：
By continuous casting billet, 1230 DEG C of insulation 4h are heated to, to continuous casting billet austenitizing；
Step 3, two-stage control are rolled：
(1) roughing：By the continuous casting billet of austenitizing, using single stand four-roller reversable mill, 4 passage roughing are carried out, be obtained
Roughing steel plate；Wherein, start rolling temperature is 1150 DEG C, and roughing accumulation reduction ratio is 75%；
(2) finish rolling：By roughing plate, using 7 frame, four roll reversing roller, 9 passage finish rolling are carried out, finish rolling steel band is obtained；Its
In, start rolling temperature is 980 DEG C, and finish rolling finishing temperature is 850 DEG C, and finish rolling accumulation reduction ratio is 91%, afterwards 3 percentage pass reductions difference
For 35%, 30% and 16%；
Step 4, cools down and batches：
By finish rolling steel band, with the cooling velocity section cooling of 22 DEG C/s, then batched with 590 DEG C of temperature, last air cooling
To room temperature, the steel band of seawater corrosion resistance containing Ti is obtained.
The atmospheric corrosion resistance test of the steel band of seawater corrosion resistance containing Ti manufactured in the present embodiment：Tried with Q345 steel as reference
Sample, is simulated accelerated corrosion tests in laboratory using period soaking corrosion test box, and solution adopts 3.5%NaCl solution
(simulated marine corrosion environment) accelerated corrosion is tested.Aqueous temperature is controlled at 45 DEG C, and in experimental box, baking temperature is controlled 70
DEG C, in case, humidity is 70%.Each soak cycles is 1h, and wherein soak time is 0.2h, and drying time is 0.8h, and experiment has altogether
Carry out 480h.0h after experiment starts respectively, 72h, 144h, 216h, 264h, 360h, 480h sampling carries out morphology observation, weightless
Measurement and corrosion product analysis.Weighing data according to sample after different cycles corrosion draws out corrosion weight loss with etching time
Relation curve, is shown in Fig. 1.Electro-chemical test is carried out to band rust sample after corrosion, the polarization curve of drafting is shown in Fig. 2.
The steel band of seawater corrosion resistance containing Ti manufactured in the present embodiment, its organization type include individual event polygonal ferrite and pearly-lustre
Body is organized, and microstructure morphology is as shown in fig. 7, the secondary electron image after 480h corrosion is as shown in Figure 10, it is seen then that by volume basis
Content, individual event polygonal ferrite are 95%, and pearlitic structrure is 5%.
The steel band of seawater corrosion resistance containing Ti manufactured in the present embodiment, its yield strength are 440MPa, and tensile strength is 540MPa,
Elongation after fracture is 37%, and -40 DEG C of Charpy-V impact powers are more than or equal to 50J.
Embodiment 3
A kind of steel band of seawater corrosion resistance containing Ti, its chemical composition and its weight/mass percentage composition are：C：0.03%, Si：
0.29%, Mn：0.988%, P：0.099%, S：0.005%, Cu：0.351%, Ti：0.351%, balance of Fe and other not
Evitable impurity element；Its thickness is 5.0mm.
The preparation method of the above-mentioned steel band of seawater corrosion resistance containing Ti, comprises the steps：
Step 1, by the chemical composition proportioning of the steel band of seawater corrosion resistance containing Ti, using the deeply de- S of molten iron, converter top bottom is compound to blow
Refining (control C content), RH vacuum circulation degassing techniques, whole process molding casting；With double roller continuous casting, through confined space, prepare
Go out thickness for 230mm continuous casting billets；
Step 2, austenitizing：
By continuous casting billet, 1240 DEG C of insulation 3.5h are heated to, to continuous casting billet austenitizing；
Step 3, two-stage control are rolled：
(1) roughing：By the continuous casting billet of austenitizing, using single stand four-roller reversable mill, 3 passage roughing are carried out, be obtained
Roughing steel plate；Wherein, start rolling temperature is 1170 DEG C, and roughing accumulation reduction ratio is 80%；
(2) finish rolling：By roughing plate, using 7 frame, four roll reversing roller, 7 passage finish rolling are carried out, finish rolling steel band is obtained；Its
In, start rolling temperature is 980 DEG C, and finish rolling finishing temperature is 860 DEG C, and finish rolling accumulation reduction ratio is 89%, afterwards 3 percentage pass reductions difference
For 35%, 30% and 23%；
Step 4, cools down and batches：
By finish rolling steel band, with the cooling velocity section cooling of 26 DEG C/s, then batched with 600 DEG C of temperature, last air cooling
To room temperature, the steel band of seawater corrosion resistance containing Ti is obtained.
The atmospheric corrosion resistance test of the steel band of seawater corrosion resistance containing Ti manufactured in the present embodiment：Tried with Q345 steel as reference
Sample, is simulated accelerated corrosion tests in laboratory using period soaking corrosion test box, and solution adopts 3.5%NaCl solution
(simulated marine corrosion environment) accelerated corrosion is tested.Aqueous temperature is controlled at 45 DEG C, and in experimental box, baking temperature is controlled 70
DEG C, in case, humidity is 70%.Each soak cycles is 1h, and wherein soak time is 0.2h, and drying time is 0.8h, and experiment has altogether
Carry out 480h.0h after experiment starts respectively, 72h, 144h, 216h, 264h, 360h, 480h sampling carries out morphology observation, weightless
Measurement and corrosion product analysis.Weighing data according to sample after different cycles corrosion draws out corrosion weight loss with etching time
Relation curve, is shown in Fig. 1.Electro-chemical test is carried out to band rust sample after corrosion, the polarization curve of drafting is shown in Fig. 3.
The steel band of seawater corrosion resistance containing Ti manufactured in the present embodiment, its organization type include individual event polygonal ferrite and pearly-lustre
Body is organized, microstructure morphology as shown in figure 8, the secondary electron image after 480h corrosion as shown in figure 11, by volumn concentration,
Individual event polygonal ferrite is 95%, and pearlitic structrure is 5%.
The steel band of seawater corrosion resistance containing Ti manufactured in the present embodiment, its yield strength are 480MPa, and tensile strength is 590MPa,
Elongation after fracture is 35%, and -40 DEG C of Charpy-V impact powers are more than or equal to 48J.
Embodiment 4
A kind of resistance to steel band of seawater corrosion containing Ti, its chemical composition and its weight/mass percentage composition are：C：0.084%, Si：
0.384%, Mn：1.01%, P：0.092%, S：0.001%, Cu：0.368%, V：0.06%, balance of Fe and other can not
The impurity element for avoiding；Its thickness is 5.0mm.
The preparation method of the above-mentioned steel band of seawater corrosion resistance containing Ti, comprises the steps：
Step 1, by the chemical composition proportioning of the steel band of seawater corrosion resistance containing Ti, using the deeply de- S of molten iron, converter top bottom is compound to blow
Refining (control C content), RH vacuum circulation degassing techniques, whole process molding casting；With double roller continuous casting, through confined space, prepare
Go out the continuous casting billet that thickness is 230mm；
Step 2, austenitizing：
By continuous casting billet, 1280 DEG C of insulation 3h are heated to, to continuous casting billet austenitizing；
Step 3, two-stage control are rolled：
(1) roughing：By the continuous casting billet of austenitizing, using single stand four-roller reversable mill, 6 passage roughing are carried out, be obtained
Roughing steel plate；Wherein, start rolling temperature is 1200 DEG C, and roughing accumulation reduction ratio is 80%；
(2) finish rolling：By roughing plate, using 7 frame, four roll reversing roller, 8 passage finish rolling are carried out, finish rolling steel band is obtained；Its
In, start rolling temperature is 1000 DEG C, and finish rolling finishing temperature is 880 DEG C, and finish rolling accumulation reduction ratio is 89%, afterwards 3 percentage pass reductions point
Wei 35%, 30% and 23%；
Step 4, cools down and batches：
By finish rolling steel band, with the cooling velocity section cooling of 28 DEG C/s, then batched with 650 DEG C of temperature, last air cooling
To room temperature, the steel band of seawater corrosion resistance containing Ti is obtained.
The atmospheric corrosion resistance test of the steel band of seawater corrosion resistance containing Ti manufactured in the present embodiment：Tried with Q345 steel as reference
Sample, is simulated accelerated corrosion tests in laboratory using period soaking corrosion test box, and solution adopts 3.5%NaCl solution
(simulated marine corrosion environment) accelerated corrosion is tested.Aqueous temperature is controlled at 45 DEG C, and in experimental box, baking temperature is controlled 70
DEG C, in case, humidity is 70%.Each soak cycles is 1h, and wherein soak time is 0.2h, and drying time is 0.8h, and experiment has altogether
Carry out 480h.0h after experiment starts respectively, 72h, 144h, 216h, 264h, 360h, 480h sampling carries out morphology observation, weightless
Measurement and corrosion product analysis.Weighing data according to sample after different cycles corrosion draws out corrosion weight loss with etching time
Relation curve, is shown in Fig. 1.Electro-chemical test is carried out to band rust sample after corrosion, the polarization curve of drafting is shown in Fig. 4.
The steel band of seawater corrosion resistance containing Ti manufactured in the present embodiment, its organization type include individual event polygonal ferrite and pearly-lustre
Body is organized, microstructure morphology as shown in figure 9, the secondary electron image after 480h corrosion as shown in figure 12, by volumn concentration,
Individual event polygonal ferrite is 90%, and pearlitic structrure is 10%.
The steel band of seawater corrosion resistance containing Ti manufactured in the present embodiment, its yield strength are 465MPa, and tensile strength is 577MPa,
Elongation after fracture is 36%, and -40 DEG C of Charpy-V impact powers are more than or equal to 58J.
Summary, the steel grades scope of design provided by the present invention and rolling production method, gained embodiment steel
Yield strength reaches more than 435MPa, and, more than 35%, low-temperature impact toughness is good for elongation percentage.Atmospheric corrosion resistance is contrasted
As a result show that the decay resistance of steel of the present invention is better than Q345.
Claims (10)
1. a kind of steel band of seawater corrosion resistance containing Ti, it is characterised in that the chemical composition of the steel band and its weight/mass percentage composition are：
C：0.02～0.15%, Si：0.2～0.4%, Mn：0.8～1.5%, P：0.07～0.1%, S≤0.005%, Cu：0.2～
0.5%, Ti：0.15～0.4%, V：0～0.06%, Ni：0～0.4%, balance of Fe and other inevitable impurity units
Element.
2. the steel band of seawater corrosion resistance containing Ti according to claim 1, it is characterised in that the thickness of the steel band is 4～
7mm.
3. the steel band of seawater corrosion resistance containing Ti according to claim 1, it is characterised in that the organization type of the steel band includes
Individual event polygonal ferrite and pearlitic structrure：Wherein, by volumn concentration, individual event polygonal ferrite is 90～95%,
Pearlitic structrure is 5～10%.
4. the steel band of seawater corrosion resistance containing Ti according to claim 1, it is characterised in that the surrender of the steel band is by force 435
～480MPa, tensile strength are 540～610MPa, and elongation after fracture is 35～40%%, and -40 DEG C of Charpy-V impact powers are more than or equal to
48～62J.
5. the preparation method of the steel band of seawater corrosion resistance containing Ti described in claim 1, it is characterised in that comprise the steps：
Step 1, by the chemical composition proportioning of the steel band of seawater corrosion resistance containing Ti, prepares continuous casting billet；
Step 2, austenitizing：
By continuous casting billet, it is heated to 1200～1280 DEG C and is incubated to continuous casting billet austenitizing；
Step 3, two-stage control are rolled：
(1) roughing：By the continuous casting billet of austenitizing, roughing is carried out, roughing steel plate is obtained；Wherein, start rolling temperature be 1150～
1200 DEG C, roughing accumulation reduction ratio is 70～82%；
(2) finish rolling：By roughing plate, finish rolling is carried out, finish rolling steel band is obtained；Wherein, start rolling temperature is 980～1000 DEG C, finish rolling end
Temperature is rolled for 850～870 DEG C, finish rolling accumulation reduction ratio is 85～95%；
Step 4, cools down and batches：
By finish rolling steel band, section cooling, then batched with 580～650 DEG C of temperature, be finally air cooled to room temperature, be obtained resistance to containing Ti
Seawater corrosion steel band.
6. the preparation method of the steel band of seawater corrosion resistance containing Ti according to claim 5, it is characterised in that in the step 1,
The concrete grammar for preparing continuous casting billet is that, using the deeply de- S of molten iron, converter top bottom blowing (control C content), RH vacuum cycles take off
Gas technique, whole process molding casting；With double roller continuous casting, through confined space, continuous casting billet is prepared；Thickness of strand be 180～
230mm.
7. the preparation method of the steel band of seawater corrosion resistance containing Ti according to claim 5, it is characterised in that in the step 2,
Temperature retention time is 3～4h.
8. the preparation method of the steel band of seawater corrosion resistance containing Ti according to claim 5, it is characterised in that in the step 3,
3～5 passage roughing are carried out altogether, and single pass reduction ratio is 25～40%；Roughing is carried out using single stand four-roller reversable mill.
9. the preparation method of the steel band of seawater corrosion resistance containing Ti according to claim 5, it is characterised in that in the step 3,
7～9 passage finish rolling are carried out altogether, and the accumulative reduction ratio of 3 passages is 45～60% afterwards；Finish rolling is carried out using 7 frame, four roll reversing roller.
10. the preparation method of the steel band of seawater corrosion resistance containing Ti according to claim 5, it is characterised in that the step 4
In, cooling velocity is 20～30 DEG C/s.
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