CN109628842A - 550MPa grades of transporting coal open-top car corrosion-resisting steels of yield strength and its manufacturing method - Google Patents
550MPa grades of transporting coal open-top car corrosion-resisting steels of yield strength and its manufacturing method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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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- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
Abstract
The present invention discloses 550MPa grades of transporting coal open-top car corrosion-resisting steels of yield strength and its manufacturing method.Contain C:0.049%~0.072% in steel, Si:0.21%~0.29%, Mn:1.05%~1.39%, P≤0.018%, S≤0.006%, Als:0.015%~0.045%, Cr:0.45%~0.91%, Ni:0.11%~0.19%, Cu:0.27%~0.41%, Nb:0.018%~0.039%, Ti:0.015%~0.035%, Sb:0.046%~0.099%, Sn:0.034%~0.079%, Mo:0.11%~0.19%, B:0.0008%~0.0019%, Ca:0.0008%~0.0030%；Surplus is iron and inevitable impurity；135~170mm heating of plate blank is to 1228~1249 DEG C, 1100 DEG C of roughing temperature >, and 1000~1100 DEG C of open rollings of finish rolling, 830~895 DEG C of finish to gauges, 580~650 DEG C of coiling temperature, steel plate has excellent resistance to sulfuric acid and chloride ion corrosion performance.
Description
Technical field
The invention belongs to rolling stock rings domains, are related to a kind of be suitble in the corrosion ring containing acid medium and chloride ion
Corrosion-resisting steel and its manufacturing method used in border.
Background technique
General steel open wagon is usually only by atmospheric corrosion, and transporting coal open-top car will be invaded by quite harsh corrosive environment
It attacks.Firstly, containing in coal has the sulfide compared with extensive chemical corrosiveness to steel；Furthermore because of coal mining Shi Yaoyong water slug, institute
With aqueous in coal, in addition when winter transporting coal, to prevent from freezing, certain salts are added, to reduce freezing point, thus bring corrosion
The extremely strong chloride ion of property.
Currently, the manufacture material that transporting coal open-top car uses is aluminium alloy, stainless steel or traditional weathering steel.Aluminium alloy and stainless
Although steel has good corrosion resistance, its weldability and mouldability are had certain problems, and the cost is relatively high；It is existing
Although railway freight-car weathering steel intensity, weldability and processability it is good, its corrosion resistance cannot be met the requirements；New one
Although being significantly improved for high corrosion-resisting steel weathering steel atmospheric corrosion resistance, be not appropriate for containing acid medium and
In the corrosive environment of chloride ion.
Chinese patent CN101994064A discloses weathering steel and its manufacturing method that a kind of yield strength is 550MPa grades,
Contain in steel: C:0.02%~0.08%, Si:0.15%~0.55%, Mn:0.2%~1.0%, P≤0.01%, S≤
0.006%, Al:0.01%~0.05%, Cr:2.5%~7.0%, Ni:0.2%~1.2%, Cu:0.2%~0.5%, Nb:
0.02%~0.06%, Ti:0.01%~0.10%.The invention is by the addition of moderate content alloying elements cr so that steel grade has
There is excellent atmospheric corrosion resistance, relative to traditional weathering steel, atmospheric corrosion resistance is more than doubled.But its Cr
Content is 2.5%~7.0%, and smelting difficulty is larger, not easy to produce, and related steel plate is not appropriate for sulfur acid and chloride ion
In corrosive environment.
Chinese patent CN103305770B discloses a kind of system of thin strap continuous casting 550MPa grades of high-strength air corrosion-resistant steel bands
Method is made, the chemical component that this method manufactures high-strength air corrosion-resistant steel band is C 0.03%~0.08%, Si≤0.4%, Mn
0.6%~1.5%, P 0.07%~0.22%, S≤0.01%, N≤0.012%, Cu 0.25%~0.80%, Cr 0.3%
~0.8%, Ni0.12%~0.4%, additionally it contained at least one of microalloy element Nb, V, Ti, Mo, Nb 0.01%~
0.08%, V 0.01%~0.08%, Ti 0.01%~0.08%, Mo0.1%~0.4%, remaining is Fe and inevitable miscellaneous
Matter.Yield strength >=550MPa of steel band, tensile strength >=650MPa, elongation percentage >=22%.Chinese patent CN107460413A
A kind of preparation method and application of 550MPa grades of Ultra-fine Grained high-strength weathering steel is disclosed, it is high that this method manufactures 550MPa grades of Ultra-fine Graineds
The chemical component of strong weathering steel is C 0.02%~0.06%, Si0.1%~0.4%, Mn 1.0%~1.7%, Al 0.01%
~0.05%, Cu 0.1%~0.4%, Ti 0.04%~0.08%, Nb 0.02%~0.05%, Ni 0.1%~0.3%,
Cr 0.3%~0.7%, P≤0.015%, S≤0.003%, N≤0.004%, surplus are iron.Chinese patent
CN101407892A discloses a kind of yield strength and is greater than 550MPa grade ultra-low-carbon hot rolling weather-resisting steel, chemical component C
0.01%~0.05%, Si 0.10%~0.40%, Mn 1.20%~1.70%, P≤0.02%, S≤0.010%, Cu
0.15%~0.80%, Cr 0.40%~1.25%, Ni 0.10%~0.50%, Mo≤0.40%, Nb 0.03%~
0.06%, Ti≤0.050%, CaO0.0010%~0.0020%, surplus are Fe and inevitable impurity.The surrender of steel plate
Intensity >=550MPa, tensile strength >=650MPa.
Chinese patent CN 104294111A discloses a kind of manufacturing method of transporting coal open-top car aluminum alloy plate materials, the invention
Related plate is aluminum alloy plate materials, not only higher cost, but also yield strength is only 220~240MPa.
In patent disclosed above or document, without a kind of steel plate special of suitable transporting coal open-top car actual operation environment, or
Requirement is not achieved in person's higher cost or corrosion resistance, intensity and toughness.
Summary of the invention
For current transporting coal open-top car steel produce, such as: using aluminium alloy, stainless steel cost compared with
High, welding and mouldability are bad, are not reached requirement using existing steel corrosion resistance, the technical solution that the present invention is specifically proposed.
The purpose of the present invention is to provide a kind of yield strength 550MPa grades of transporting coals open-top car corrosion-resisting steel, especially a kind of thickness
Metric lattice are 550MPa grades of transporting coal open-top car corrosion-resisting steels of yield strength and its manufacturing method of 4.0~10.0mm, existing to solve
The above problem present in technology.Steel plate not only has a good atmospheric corrosion resistance, and with excellent resistance to sulfuric acid and
Corrosive nature under chloride ion coexisted environment, in addition to this, steel plate also have high intensity, excellent processability and low temperature tough
Property, it is suitable for the manufacture of transporting coal open-top car.
Specific technical solution is:
The present invention proposes a kind of 550MPa grades of transporting coal open-top car corrosion-resisting steel, and chemical component is as follows by mass percentage: C:
0.049%~0.072%, Si:0.21%~0.29%, Mn:1.05%~1.39%, P≤0.018%, S≤0.006%,
Als:0.015%~0.045%, Cr:0.45%~0.91%, Ni:0.11%~0.19%, Cu:0.27%~0.41%,
Nb:0.018%~0.039%, Ti:0.015%~0.035%, Sb:0.046%~0.099%, Sn:0.034%~
0.079%, Mo:0.11%~0.19%, B:0.0008%~0.0019%, Ca:0.0008%~0.0030%, remaining is Fe
With inevitable element.
C: being main intensified element in steel, can significantly improve the intensity of steel plate, but the C of more content welds steel plate
Property, toughness and plasticity are unfavorable.Low C, which is designed, to be to limit the formation of pearlitic structrure and other carbide, guarantees the micro- of steel
Structure is equal phase constitution, avoids electrochemical corrosion caused by the potential difference between out-phase, improves the corrosion resisting property of steel, this hair
Bright middle C content control is 0.049%~0.072%.
Si:Si solid solubility with higher in steel has preferable solution strengthening effect, but its too high levels can make steel
Plasticity and toughness reduce, welding performance decline.Mainly as deoxidant element in the present invention, not as main intensified element, Si
Content is controlled 0.21%~0.29%.
Mn: there is solution strengthening effect, moreover it is possible to increase stabilization of austenite, harden ability is also advantageous to improving, but manganese content
It is excessive, the center segregation tendency of continuous casting billet can be increased, solderability and welding heat influence area toughness is also caused to deteriorate, it will in the present invention
Mn content is controlled 1.05%~1.39%.
P: can effectively improve the atmospheric corrosion resistance of steel, but phosphorus is easy to be segregated, increase the cold brittleness of steel, to weldability and
Mouldability is unfavorable.To guarantee welding performance and processability requirement, P content is controlled it in the present invention and is not higher than 0.018%.
S: being harmful element in steel, and steel is made to generate red brittleness, reduces the ductility and toughness of steel, deteriorates welding performance, together
When S presence will deteriorate the atmospheric corrosion resistance of steel, S content is controlled it not higher than 0.006% in the present invention.
Als: being common deoxidier, and 0.015%~0.045% aluminium is added in steel, can refine crystal grain.
Cr, Ni, Cu: three kinds of elements are added in steel simultaneously has good effect to atmospheric corrosion resistance is improved.Steel plate
In corrosion process, the enrichment of element such as Cu, Cr, Ni in the rusty scale of matrix, formed it is fine and close, close to amorphous stabilization
Rusty scale.Ni can also significantly improve the low-temperature flexibility of steel simultaneously, increase substantially substrate and Low Temperature Impact Toughness of Heat-affected Zone.
The weight ratio of Ni/Cu is 1/2 or more, can effectively prevent steel containing Cu due to check crack caused by hot-short.By the content of Cr in the present invention
Control is 0.45%~0.91%, by the content control of Ni 0.11%~0.19%, by the content control of Cu 0.27%~
0.41%.
Nb: both can be improved the recrystallization temperature of austenite, carry out controlled rolling in higher temperature, reduce milling train
Load, while austenite can be reduced again to ferrite transformation temperature, promote the formation of low-carbon bainite or acicular ferrite, change
The performance of kind steel.Nb also improves the intensity of steel by precipitation strength.The range of Nb content of the invention be 0.018%~
0.039%.
Ti: being strong nitrogen killer, and the tiny TiN precipitated phase of high-temperature stable can be formed in sheet billet continuous casting, this tiny
TiN precipitated phase can effectively prevent continuous casting billet austenite grain is grown up during heating, while to heat when improving steel welding
The toughness of the zone of influence has obvious effect, controls Ti content 0.015%~0.035% in the present invention.
Sb, Sn:Sb and Sn element are constantly enriched in steel usually as harmful element, severely impact the quality of steel.
Sb and Sn is to improve corrosion proof effective element in the present invention, and by the compound addition of Sb, Sn and Cr, collaboration is rich in rusty scale
Collection, and form one layer of fine and close dense oxidation film rich in elements such as Sb, Sn, Cr higher than several times of matrix, significantly obstruction etch
Property the ion transmission and corrosive environment that coexists of more resistance to sulfate radical and chloride ion.In order to ensure obtaining required corrosion resistance
It can, it is necessary to play the common effect of three elements.Ti and Sb attracts each other simultaneously, when in Ti segregation to crystal boundary, also drags Sb
It drags on crystal boundary, so that Sb is precipitated with tiny second phase particles, rather than field trash form is precipitated, and particle size is in 10~30nm
Between, to improve the intensity of steel plate.Sb is effective to the resistance to sulfuric acid and resistance to sour corrosion containing chloride, and Sb amount is more
It is then resistance to sulfuric acid higher, but the toughness of hot-workability, steel plate and welding point can be reduced.Therefore, the present invention is by Sb's
Content control controls the content of Sn 0.034%~0.079% 0.046%~0.099%.
Mo: MoO is generated in aqueous solution4 2-Ion, to inhibit chloride permeability, so as to improve the corrosion resistance of antifreezing agent, but
It is a large amount of containing being deteriorated sometimes to the corrosion resistance of sulfuric acid, also can impaired low temperature toughness, and form martensite in welding, cause to weld
The brittle increase of connector inhibits chloride ion effect unobvious, while considering the increase of cost when a small amount of.Containing Mo in the present invention
Amount control is 0.11%~0.19%.
B: in the corrosion-resistant element of the low melting point containing Sb, Cu, Sn, a certain amount of B, which is added, can play inhibition hot-working
Property be deteriorated effect.When less than 0.0008%, enough effects are unable to get, if it exceeds 0.0019%, there is heat instead and adds
The tendency that work is deteriorated.Therefore, when addition, it is desired for making content range 0.0008%~0.0019%.
Ca: making sulfide nodularization, may further ensure that the lateral extensibility of steel plate improves, improves cold roll forming performance.
Ca processing is carried out after refining, Ca content has the function that 0.0008% can play nodularization sulfide, excessive Ca meeting
Make sulfide coarsening, cause ductility reduction, therefore the present invention limits the upper limit of Ca content as 0.0030%, by Ca content control
System is 0.0008%~0.0030%.
Another aspect of the present invention provides the manufacturing method of the anti-corrosion hot-rolled coil of the 550MPa grades of transporting coal open-top car, the side
Method includes slab smelting, continuous casting, heating, rolling, cooling, batches, and specific production method includes:
(1) smelt continuous casting process: molten iron pretreatment, converter smelting-is through top blast or top bottom blowing, at LF furnace desulfurization
Reason and ductility, toughness and the cold-bending property for carrying out Calcium treatment to control inclusion morphology with improve steel, continuous casting are stirred using electromagnetism
Dynamic soft-reduction is mixed and stirred, to improve the quality of continuous casting steel billet.Converter procedure is added by the way of antimony slab after tapping, utilizes argon gas
Be stirred, be completely melt alloy, ingredient it is uniform.Continuous casting billet with a thickness of 135~170mm, hence it is evident that be thinner than and mainly answer at present
The thick continuous casting billet of 200mm or more, solidification cooling rate are far longer than traditional heavy slab, and secondary dendrite spacing is substantially
Degree reduces.
(2) rolling mill practice: for the heated stove heating of continuous casting steel billet to 1228~1249 DEG C, it is reproducibility gas that steel atmosphere is burnt in heating
Atmosphere, air-fuel ratio are lower than 2.0.Steel technology is burnt using high temperature, short time, guarantees that hot material bringing-up section and soaking zone time inside furnace are not more than
110min, to prevent low melting point element Cu, Sb and Sn in the precipitation of belt steel surface and caused by surface defect so that slab
Surface low melting point Cu, Sb and Sn generate fine defects can be fully oxidized, and formation is loose easily to remove iron scale, to improve strip table
Face quality.Roughing is carried out within the temperature range of being higher than 1100 DEG C, strip does not allow to swing, in 1000 DEG C~1100 DEG C beginning essences
It rolls, finish rolling start rolling temperature is higher than 1100 DEG C, and finished product crystal grain is not easy to refine, and refined crystalline strengthening effect is bad；Lower than 1000 DEG C, strip tail
Portion's cooling is fast, increases the load of finishing rolling mill, is easy to cause accident；In 830~895 DEG C of end rollings, it is specified that finishing temperature exists
830 DEG C or more, mill load can be kept excessive to avoid the rolling in coexistence region, and avoid the deformation temperature area that template is difficult to control
Between, and can be reduced steel plate vertically and horizontally performance difference.But finishing temperature is higher than 895 DEG C, and crystal grain refinement is insufficient, influences strengthening effect.
Finishing temperature of the present invention is preferably controlled in 848~885 DEG C.Section cooling is carried out after rolling, is batched.Coiling temperature is set in
580~650 DEG C, it is higher than 650 DEG C, fine grained texture is difficult to obtain after batching, strength and toughness is insufficient.Lower than 580 DEG C, it may appear that mistake
The bainite transformation of amount, elongation percentage decline, influences processability.Coiling temperature of the present invention is preferably controlled in 590~640 DEG C, layer
Stream concentrates cooling using leading portion.
The present invention produces the above method and produces transporting coal open-top car corrosion-resisting steel, and yield strength can reach 550MPa or more, resists
Tensile strength is not less than 650MPa, and elongation percentage is not less than 18%, and -40 DEG C of impact flexibility are not less than 60J, and clod wash is qualified.According to TB/
T2375-93, in 45 ± 2 DEG C, 70% ± 5%RH, 0.01mol/LNaHSO3Under the conditions of testing 72h in solution, relative to Q345B
Corrosion rate is less than 55%.According to JB/T 7901-1999, at room temperature, 20%H2SO4It is soaked entirely in+3.5%NaCl solution for 24 hours,
Relative to Q345B corrosion rate less than 4%.
The utility model has the advantages that
The present invention compared with the existing technology, has the beneficial effect that:
(1) it is added simultaneously using a variety of alloying elements, especially the synergistic effect of Cr, Cu, Sb and Sn, there are also Nb, Ti, Mo
Achieved the effect that high-intensitive and anti-corrosion with the booster action of the elements such as B by a small amount of polynary effect of alloying element.
(2) using continuous casting steel billet with a thickness of 135~170mm, using short route casting and rolling process, using high temperature, short time
Fast-firing technique, it is high-efficient, save the energy.
(3) steel plate not only has good atmospheric corrosion resistance, but also has excellent medium corrosion resistance energy.By this
The 550MPa grade transporting coal open-top car corrosion resistant plate for inventing production, relative to weathering steel currently in use, atmospheric corrosion resistance
Can be with it quite, but medium corrosion resistance can significantly improve, the corrosive environment that especially resistance to sulfuric acid and chloride ion coexist can mention
The service life of high transporting coal open-top car in the presence of a harsh environment, is greatly reduced vehicle maintenance cost.
Specific embodiment
For following embodiment for illustrating the content of present invention, these embodiments are only the general description of the content of present invention,
The content of present invention is not limited.
The chemical component of steel embodiment of the present invention is shown in Table 1, and the rolling mill practice of steel embodiment of the present invention is shown in Table 2, steel of the present invention
The mechanical property of embodiment is shown in Table 3.On the steel plate of Examples 1 to 10, the sample of 50 × 50 × 5mm, test method ginseng are intercepted
Period soaking corrosion test, test period are carried out according to TB/T 2375-93 " railway weathering steel alternate-immersion test method " standard
The atmospheric corrosion resistance of 72h, steel embodiment of the present invention the results are shown in Table 4；On the steel plate of Examples 1 to 10, interception 50 × 25
The sample of × 5mm, test method are marked referring to JB/T 7901-1999 " Uniform Corrosion Method of Laboratory Immersion Test method "
Standard carries out 20%H2SO4The soak test of+3.5%NaCl, test period for 24 hours, the resistance to 20%H of steel embodiment of the present invention2SO4+
3.5%NaCl corrosion test result is shown in Table 5.
The chemical component (wt%) of the steel embodiment of the present invention of table 1
The rolling mill practice of 2 steel of the embodiment of the present invention of table
The mechanical property of 3 steel of the embodiment of the present invention of table
4 steel atmospheric corrosion resistance test result of the embodiment of the present invention of table
| Steel grade | Relatively corrosive rate/% |
| Embodiment 1 | 54 |
| Embodiment 2 | 52 |
| Embodiment 3 | 51 |
| Embodiment 4 | 50 |
| Embodiment 5 | 53 |
| Embodiment 6 | 54 |
| Embodiment 7 | 51 |
| Embodiment 8 | 52 |
| Embodiment 9 | 53 |
| Embodiment 10 | 54 |
| Q550NQR1 | 54 |
| Q345B | 100 |
Note: straight carbon steel Q345B and high-strength weathering steel Q550NQR1 is contrast sample.
The 5 resistance to 20%H of steel of the embodiment of the present invention of table2SO4+ 3.5%NaCl corrosion test result
| Steel grade | Relatively corrosive rate/% |
| Embodiment 1 | 3.18 |
| Embodiment 2 | 3.01 |
| Embodiment 3 | 2.29 |
| Embodiment 4 | 3.14 |
| Embodiment 5 | 2.40 |
| Embodiment 6 | 2.91 |
| Embodiment 7 | 3.18 |
| Embodiment 8 | 2.29 |
| Embodiment 9 | 2.26 |
| Embodiment 10 | 3.06 |
| Q550NQR1 | 12.8 |
| Q345B | 100 |
Note: straight carbon steel Q345B and high-strength weathering steel Q550NQR1 is contrast sample.
By table 1~5 as it can be seen that the transporting coal open-top car corrosion-resisting steel produced using technical solution of the present invention, yield strength are reached
550MPa or more, atmospheric corrosion resistance is suitable with existing high-strength weathering steel Q550NQR1, resistance to SO42-+Cl-Corrosive effect is obvious
Better than existing high-strength weathering steel and straight carbon steel Q345B, not only there is good atmospheric corrosion resistance, but also with excellent resistance to
Corrosive nature under sulfuric acid and chloride ion coexisted environment, meanwhile, steel plate also has high intensity, excellent processability and low temperature tough
Property, it is suitable for the manufacture of transporting coal open-top car.
Claims (4)
1. a kind of yield strength 550MPa grades of transporting coals open-top car corrosion-resisting steel, which is characterized in that chemical component presses quality percentage in steel
Than are as follows: C:0.049%~0.072%, Si:0.21%~0.29%, Mn:1.05%~1.39%, P≤0.018%, S≤
0.006%, Als:0.015%~0.045%, Cr:0.45%~0.91%, Ni:0.11%~0.19%, Cu:0.27%~
0.41%, Nb:0.018%~0.039%, Ti:0.015%~0.035%, Sb:0.046%~0.099%, Sn:0.034%
~0.079%, Mo:0.11%~0.19%, B:0.0008%~0.0019%, Ca:0.0008%~0.0030%, surplus are
Iron and inevitable impurity.
2. yield strength 550MPa grades of transporting coals open-top car corrosion-resisting steel according to claim 1, it is characterised in that the thickness of steel plate
Degree is 4.0~10.0mm.
3. a kind of manufacturing method of yield strength 550MPa grades of transporting coals open-top car corrosion-resisting steel as claimed in claim 1 or 2, steel plate
Production technology are as follows: slab smelting, heating, rolling, cooling, is batched continuous casting, it is characterised in that:
(1) continuous casting process is smelted: through molten iron pretreatment, converter smelting, LF furnace desulfurization process and Calcium treatment；Continuous casting is stirred using electromagnetism
It mixes or dynamic soft-reduction, converter procedure is added by the way of antimony slab after tapping, is stirred using argon gas；The thickness of continuous casting billet
For 135~170mm；
(2) rolling mill practice: for the heated stove heating of continuous casting steel billet to 1228~1249 DEG C, it is reducing atmosphere that steel atmosphere is burnt in heating,
Air-fuel ratio is lower than 2.0；Hot material bringing-up section and soaking zone time inside furnace are not more than 110min；
Roughing temperature is higher than 1100 DEG C, and finish rolling start rolling temperature is 1000~1100 DEG C, and finish rolling finishing temperature is 830~895 DEG C, rolls
Section cooling is carried out after system, is batched, and coiling temperature is set in 580~650 DEG C, and laminar flow concentrates cooling using leading portion.
4. the manufacturing method of yield strength 550MPa grades of transporting coals open-top car corrosion-resisting steel according to claim 3, feature exist
In the finish rolling finishing temperature control is at 848~885 DEG C, and the oiler temperature control is at 590~640 DEG C.
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