CN106498288B - 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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- CN106498288B CN106498288B CN201611186727.9A CN201611186727A CN106498288B CN 106498288 B CN106498288 B CN 106498288B CN 201611186727 A CN201611186727 A CN 201611186727A CN 106498288 B CN106498288 B CN 106498288B
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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%, surplus is Fe and other inevitable impurity elements；Thickness is 4~7mm；Preparation method：1) continuous casting billet is prepared；2) by continuous casting billet, it is heated to austenitizing；3) first roughing, then finish rolling；4) by finish rolling steel band, batched after section cooling, be finally air-cooled to room temperature, seawater corrosion resistance steel band is made；Steel band composition of the present invention is unique, has good corrosivity and corrosion fatigue resistant performance；Preparation method is not required to be tempered, can the rolled supply of material, the yield strength of steel plate is more than 35% in more than 435MPa, tensile strength in more than 540MPa, elongation percentage, and 40 DEG C of Charpy-V impact powers are more than 48J.
Description
Technical field
The invention belongs to low-alloy steel to manufacture field, more particularly to a kind of steel band of seawater corrosion resistance containing Ti and its preparation
Method.
Background technology
Ocean is 21 century world politics, economy, the commanding elevation of military competition.For the purpose of utilizing ocean to greatest extent
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, which propose, " to improve marine resources development ability, Development of Marine economy, protects the marine eco-environment, determine to safeguard state
The development strategy of family's maritime rights and interests, construction ocean power ".Marine resources development ability is improved, determines to safeguard national marine rights and interests,
Build ocean power, it is necessary to Development of Marine engineer equipment, develop advanced marine material and its application technology, especially dosage is larger
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 put down using conventional low alloy steels with 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 production
Product contain higher C due to containing more expensive metallic element Cr, Ni in component system simultaneously, make welding performance and resistance to
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, decay resistance can be significantly improved on the premise of cost is not greatly improved, 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 in addition to application and cathodic protection mode by adding the various microalloy elements of such as Cu, P, Cr, Ni
The strength and toughness and corrosion resistance of material.Although the protected mode of various microalloy elements is widely studied, but for containing the micro- of Ti
Steel alloy, Ti addition is a lot of to the crystal grain refinement of steel and precipitation strength researcher, the research for the weathering steel containing Ti, especially
It is the research for corrosion resisting property and mechanism of the 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, Ni elements are not added, it is a certain degree of to reduce cost, and ensure that decay resistance.But
Higher Al content (0.45~0.6%) can bring a series of problems, and smelting molten steel difficulty is big, easily makes steel internal quality of steel plate not
It is qualified, and armor plate strength can be reduced.And the steel is also not added with Cu elements, the problem of existing ibid.
Publication number CN102534378 A patent, 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 it is higher (0.05~
0.45%), micro Ti elements can be fixed by carbon completely, but because carbon content is higher, understand the precipitation of some cementite,
It is difficult to obtain the uniform microscopic structure of metallographic structure completely, the decay resistance of steel is influenceed.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 influenceed.
The A of publication number CN 103741057, a kind of high steel plate of resistance to marine environment of low-density and its production technology, are introduced
A kind of low density steel containing aluminium 0.1~2.0%, reduces the density of steel plate, realizes structure loss of weight.But the steel plate adds
The Cu elements of very small amount 0.04% or so, 0.2~0.4% Cu of corrosion-resistant requirement addition is not reaching to, but added
Cr, Ni, Al total content in 0.3~1.5% or so alloying element improve decay resistance, so can not only improve material
Cost, and corrosion resistance can reach the anticorrosion effect suitable with adding Cu elements.
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 of micro- Ca (0.0015~0.004%) processing, precious metal Ni elements are not added, reduce cost, but
Micro Ca is added, 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 it is highly difficult to add Ca in terms of smelting, and also content is difficult control, is difficult to realize.One kind is described 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 higher yield strength is obtained
And preferable decay resistance, but can not meet that rolled is supplied, follow-up heat treatment step is added, production cycle length is raw
It is high to produce 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 corrosion-resisting steel of content 0.1~0.16%, carbon content is not relatively low, and ferritic structure is produced by the big pressure of high temperature, but
Ferrite crystal grain is more thick, and yield strength is extremely difficult to 500MPa.The invention refers to improves field trash by Calcium treatment technology
Type does not refer to the content and adding method of calcium so as to improve decay resistance, but in invention, and this 2 points are precisely difficult point.
The A of publication number CN 101319293, 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, therefore yield strength is relatively low, in 295~380MPa, it is difficult to meets now to high-strength
Spend the demand of weathering steel.
The content of the invention
In view of the shortcomings of 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 and its production technology of new high Ti contents, using Ti fix steel in C, N element, obtain
To the uniform single microscopic structure of steel containing Ti, intrinsic silicon potential difference is smaller, 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%, surplus is Fe and other inevitable impurity elements.
The steel band of seawater corrosion resistance containing Ti of the present invention, its thickness is 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 is 435~480MPa that it, which is surrendered strong, tensile strength for 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 following steps：
Step 1, matched by the chemical composition of seawater corrosion resistance steel band, prepare continuous casting billet；
Step 2, austenitizing：
By continuous casting billet, 1200~1280 DEG C of insulations are heated to continuous casting billet austenitizing；
Step 3, two-stage control rolls：
(1) roughing：By the continuous casting billet of austenitizing, roughing is carried out, roughing steel plate is made；Wherein, start rolling temperature 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 made；Wherein, start rolling temperature is 980~1000 DEG C, essence
Finishing temperature is rolled for 850~870 DEG C, and finish rolling accumulation reduction ratio is 85~95%；
Step 4, cool down and batch：
By finish rolling steel band, section cooling, then batched with 580~650 DEG C of temperature, be finally air-cooled to room temperature, be made 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 specific method 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, soaking time is 3~4h.
In the step 2, continuous casting billet austenitizing criterion is that the volumn concentration of austenite is 80 during it is organized
~100%.
In the step 3,3~5 passage roughing are carried out altogether, and 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, it is 45~60% that rear 3 passage, which adds up reduction ratio,.
In the step 3, finish rolling is carried out using the roll reversing roller of 7 frame four.
In the step 4, cooling velocity is 20~30 DEG C/s.
Compared with existing weathering steel, seawater corrosion resistance containing Ti of the invention steel band and preparation method thereof, beneficial effect is：
1. the steel band composition that the present invention manufactures is unique, C content is reduced, adds Ti elements, Ti contents reach as high as
0.4%, due to Ti elements, corrosion resisting property itself is excellent so that the resistance to ocean different zones of steel plate that the present invention produces 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 apply in terms of ocean engineering；
2. the steel plate that the present invention manufactures 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. corrosion-resisting steel provided by the invention belongs to high-strength corrosion-resistant steel, 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 are more than 48J, and the development for adapting to steel products minimizing becomes
Gesture；
4. the production technology of steel of the present invention is two-stage control rolling, is advantageous to obtain the tissue of 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.
Brief 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 electric polarization curve of the steel band of seawater corrosion resistance containing the Ti corrosion different cycles of Fig. 2 embodiment of the present invention 2；
The electric polarization curve of the steel band of seawater corrosion resistance containing the Ti corrosion different cycles of Fig. 3 embodiment of the present invention 3；
The electric polarization curve of the steel band of seawater corrosion resistance containing the Ti corrosion different cycles of Fig. 4 embodiment of the present invention 4；
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.
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%, surplus is Fe and other are inevitable
Impurity element, its thickness are 5mm.It is as shown in Figure 5 that it corrodes the electric polarization curve of different cycles；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%, surplus 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 following steps：
Step 1, matched by the chemical composition 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
Refine (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 rolls：
(1) roughing：By the continuous casting billet of austenitizing, using single stand four-roller reversable mill, 5 passage roughing are carried out, are made
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 the roll reversing roller of 7 frame four, 8 passage finish rolling are carried out, finish rolling steel band is made；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%, rear 3 percentage pass reduction point
Wei 35%, 30% and 24%；
Step 4, cool down and batch：
By finish rolling steel band, with 25 DEG C/s cooling velocity section cooling, then batched with 620 DEG C of temperature, last air cooling
To room temperature, the steel band of seawater corrosion resistance containing Ti is made.
The atmospheric corrosion resistance test of the steel band of seawater corrosion resistance containing Ti manufactured in the present embodiment：Tried by reference of Q345 steel
Sample, simulation accelerated corrosion experiment is carried out using period soaking corrosion test box, solution is using 3.5%NaCl solution (simulation ocean
Corrosive environment) accelerated corrosion experiment.Aqueous temperature is controlled at 45 DEG C, and baking temperature control is wet in case at 70 DEG C in experimental box
Spend for 70%.Each soak cycles are 1h, and wherein soak time is 0.2h, drying time 0.8h, and experiment carries out altogether 480h.
The 0h after experiment starts, 72h, 144h respectively, 216h, 264h, 360h, 480h sampling carry out morphology observation, weightless measurement and corruption
Lose product analysis；The weighing data of sample draws out corrosion weight loss after being corroded according to different cycles and the relation of etching time is bent
Line, see 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 tissue, microstructure morphology are 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, tensile strength 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%, surplus is Fe and other can not keep away
The impurity element exempted from；Its thickness is 5.0mm.
The preparation method of the above-mentioned steel band of seawater corrosion resistance containing Ti, comprises the following steps：
Step 1, matched by the chemical composition 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
Refine (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 rolls：
(1) roughing：By the continuous casting billet of austenitizing, using single stand four-roller reversable mill, 4 passage roughing are carried out, are made
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 the roll reversing roller of 7 frame four, 9 passage finish rolling are carried out, finish rolling steel band is made；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%, rear 3 percentage pass reduction difference
For 35%, 30% and 16%；
Step 4, cool down and batch：
By finish rolling steel band, with 22 DEG C/s cooling velocity section cooling, then batched with 590 DEG C of temperature, last air cooling
To room temperature, the steel band of seawater corrosion resistance containing Ti is made.
The atmospheric corrosion resistance test of the steel band of seawater corrosion resistance containing Ti manufactured in the present embodiment：Tried by reference of Q345 steel
Sample, simulation accelerated corrosion experiment is carried out using period soaking corrosion test box in laboratory, solution uses 3.5%NaCl solution
(simulated marine corrosion environment) accelerated corrosion is tested.Aqueous temperature is controlled at 45 DEG C, and baking temperature control is 70 in experimental box
DEG C, humidity is 70% in case.Each soak cycles are 1h, and wherein soak time is 0.2h, drying time 0.8h, and experiment has altogether
Carry out 480h.The 0h after experiment starts, 72h, 144h respectively, 216h, 264h, 360h, 480h sampling carry out morphology observation, weightless
Measurement and corrosion product analysis.The weighing data of sample draws out corrosion weight loss and etching time after being corroded according to different cycles
Relation curve, see 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 tissue, 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%, pearlitic structrure 5%.
The steel band of seawater corrosion resistance containing Ti manufactured in the present embodiment, its yield strength are 440MPa, tensile strength 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%, surplus be 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 following steps：
Step 1, matched by the chemical composition 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
Refine (control C content), RH vacuum circulation degassing techniques, whole process molding casting；With double roller continuous casting, through confined space, prepare
It is 230mm continuous casting billets to go out thickness；
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 rolls：
(1) roughing：By the continuous casting billet of austenitizing, using single stand four-roller reversable mill, 3 passage roughing are carried out, are made
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 the roll reversing roller of 7 frame four, 7 passage finish rolling are carried out, finish rolling steel band is made；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%, rear 3 percentage pass reduction difference
For 35%, 30% and 23%；
Step 4, cool down and batch：
By finish rolling steel band, with 26 DEG C/s cooling velocity section cooling, then batched with 600 DEG C of temperature, last air cooling
To room temperature, the steel band of seawater corrosion resistance containing Ti is made.
The atmospheric corrosion resistance test of the steel band of seawater corrosion resistance containing Ti manufactured in the present embodiment：Tried by reference of Q345 steel
Sample, simulation accelerated corrosion experiment is carried out using period soaking corrosion test box in laboratory, solution uses 3.5%NaCl solution
(simulated marine corrosion environment) accelerated corrosion is tested.Aqueous temperature is controlled at 45 DEG C, and baking temperature control is 70 in experimental box
DEG C, humidity is 70% in case.Each soak cycles are 1h, and wherein soak time is 0.2h, drying time 0.8h, and experiment has altogether
Carry out 480h.The 0h after experiment starts, 72h, 144h respectively, 216h, 264h, 360h, 480h sampling carry out morphology observation, weightless
Measurement and corrosion product analysis.The weighing data of sample draws out corrosion weight loss and etching time after being corroded according to different cycles
Relation curve, see 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 tissue, microstructure morphology is as shown in figure 8, the secondary electron image after 480h corrosion is as shown in figure 11, by volumn concentration,
Individual event polygonal ferrite is 95%, pearlitic structrure 5%.
The steel band of seawater corrosion resistance containing Ti manufactured in the present embodiment, its yield strength are 480MPa, tensile strength 590MPa,
Elongation after fracture is 35%, and -40 DEG C of Charpy-V impact powers are more than or equal to 48J.
Claims (8)
1. a kind of steel band of seawater corrosion resistance containing Ti, it is characterised in that the chemical composition and its weight/mass percentage composition of the steel band
For：
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%, surplus is Fe and other inevitable impurity elements, thickness is 4 ~
7mm, organization type include individual event polygonal ferrite and pearlitic structrure；Wherein, by volumn concentration, individual event polygon iron
Ferritic is 90 ~ 95%, and pearlitic structrure is 5 ~ 10%.
2. 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 48 ~ 62J.
3. the preparation method of the steel band of seawater corrosion resistance containing Ti described in claim 1, it is characterised in that including following step
Suddenly：
Step 1, matched by the chemical composition of the steel band of seawater corrosion resistance containing Ti, prepare continuous casting billet；
Step 2, austenitizing：By continuous casting billet, 1200 ~ 1280 DEG C of insulations are heated to continuous casting billet austenitizing；
Step 3, two-stage control rolls：
(1) roughing：By the continuous casting billet of austenitizing, roughing is carried out, roughing steel plate is made；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 made；Wherein, start rolling temperature is 980 ~ 1000 DEG C, finish rolling finish to gauge
Temperature is 850 ~ 870 DEG C, and finish rolling accumulation reduction ratio is 85 ~ 95%；
Step 4, cool down and batch：
By finish rolling steel band, section cooling, then batched with 580 ~ 650 DEG C of temperature, be finally air-cooled to room temperature, be made and contain Ti
Seawater corrosion resistance steel band.
4. the preparation method of the steel band of seawater corrosion resistance containing Ti according to claim 3, it is characterised in that the step
In rapid 1, the specific method for preparing continuous casting billet is, using the deeply de- S of molten iron, converter top bottom blowing, RH vacuum circulation degassings
Technique, whole process molding casting；With double roller continuous casting, through confined space, continuous casting billet is prepared；Thickness of strand be 180 ~
230mm。
5. the preparation method of the steel band of seawater corrosion resistance containing Ti according to claim 3, it is characterised in that the step
In 2, soaking time is 3 ~ 4h.
6. the preparation method of the steel band of seawater corrosion resistance containing Ti according to claim 3, it is characterised in that the step
In 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.
7. the preparation method of the steel band of seawater corrosion resistance containing Ti according to claim 3, it is characterised in that the step
In 3,7 ~ 9 passage finish rolling are carried out altogether, it is 45 ~ 60% that rear 3 passage, which adds up reduction ratio,；Using the roll reversing roller of 7 frame four
Carry out finish rolling.
8. the preparation method of the steel band of seawater corrosion resistance containing Ti according to claim 3, it is characterised in that the step
In rapid 4, cooling velocity is 20 ~ 30 DEG C/s.
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| CN107475622B (en) * | 2017-09-05 | 2019-10-08 | 武汉钢铁有限公司 | Steel plate and its manufacturing method with good thermal processability energy |
| CN110923548B (en) * | 2019-12-10 | 2021-05-04 | 马鞍山钢铁股份有限公司 | Steel hot-rolled steel strip with seawater erosion corrosion resistance for fastener and production method thereof |
| CN112522617A (en) * | 2020-11-23 | 2021-03-19 | 首钢集团有限公司 | Steel for scaffold and preparation method thereof |
| CN115522137B (en) * | 2021-06-25 | 2023-11-14 | 宝山钢铁股份有限公司 | Ocean atmospheric corrosion resistant steel and manufacturing method thereof |
| CN113981330A (en) * | 2021-10-28 | 2022-01-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Corrosion-resistant steel rail and detection method thereof |
| CN114438409A (en) * | 2022-01-07 | 2022-05-06 | 日照钢铁控股集团有限公司 | Seawater corrosion resistant high-strength steel and preparation process thereof |
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