CN107400823B - A kind of high-strength Ni-Cr corrosion resisting steel wire rods for steel strands and its production method - Google Patents
A kind of high-strength Ni-Cr corrosion resisting steel wire rods for steel strands and its production method Download PDFInfo
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- CN107400823B CN107400823B CN201610329364.3A CN201610329364A CN107400823B CN 107400823 B CN107400823 B CN 107400823B CN 201610329364 A CN201610329364 A CN 201610329364A CN 107400823 B CN107400823 B CN 107400823B
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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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
-
- 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
-
- 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
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention provides a kind of high-strength Ni-Cr corrosion resisting steel wire rods for steel strands and its production method, wire rod ingredient is as follows by weight percentage: C:0.80%~0.85%, Si:0.15%~0.35%, Mn:0.60%~0.90%, P :≤0.025%, S :≤0.015%, Cr:0.20%~0.30%, Ni:0.20%~0.30%, remaining is Fe and inevitable impurity element.Method include molten iron pretreatment-converter smelting-LF furnace refining-billet continuous casting-square billet tandem rolling-steel billet cleaning-heating-rolling-control it is cold-finishing-inspection-storage, wire rod of the present invention contains Cr, Ni element, improve the intensity, plasticity, corrosion resistance of wire rod, by steel-making, roll control technique, the wire rod that mechanical property, drawing processability, corrosion resistance etc. are had excellent performance is obtained.
Description
Technical field
The invention belongs to metal material field more particularly to a kind of high-strength corrosion-resistant erosion steel strand wires wire rods and its producer
Method.
Background technique
High-speed railway, highway bridge construction in, prestressing force beam body with it from heavy and light, span is big, driving is comfortable, saves
Many advantages, such as steel and good concrete, durability, has obtained commonly used.But since equipment, personnel, material technology etc. are non-
Construction factor is refined, causes occur series of prestressed concrete structure durability failure accidents in recent decades, wherein
It is destroyed caused by prestress wire corrosion and accounts for the overwhelming majority, to cause serious consequence, this has caused countries in the world
The concern of person and engineering circles.
Prestress wire corrosion, directly influences the active time of the engineerings such as bridge.Although using zinc-plated, epoxy resin
The methods of can slow down corrosion degree, but cost is too high and still has some quality problems, therefore fails to be used widely.It wants
Thoroughly solve the problems, such as that prestress wire corrodes, it is necessary to set about from source, optimize steel strand wires material, improve steel strand wires material
Corrosion resistance.
" a kind of high-strength prestressed steel wire with the production technology of 82B wire rod and its wire rod " (CN102876983B) is disclosed
Cr:0.20~0.24%, Ni in wire rod chemical component :≤0.10%, Cu :≤0.05%；Production process: raw material, smelting, company
Casting, heating, temperature-controlled rolling, spinning is coiled, control is cold, post-processing obtains wire rod.The invention improves wire rod intensity and modeling by Cr, V
Property, contain micro Ni element, is also not directed to the corrosive nature of wire rod.
" a kind of the 82B wire rod of the high Cr of small dimension roll then control cooling means " (CN104001741A) discloses a kind of small rule
LatticeCr content range is 0.30~0.40%, steel billet sectional dimension range is 100mm × 100mm~260mm
The 82B wire rod of × 260mm controls cooling means after rolling.The invention is suitable forSmall dimension wire rod, and do not relate to
And the Design of Chemical Composition and corrosion resistance of wire rod.
A kind of production method of twisted wire steel disclosed in " production method of 82B steel strand wires steel " (CN102211159B), which uses, to be turned
Furnace smelting-LF refining-RH refining-bloom continuous casting technique produces 82B steel, and Cr content is 0.015~0.22% in steel,
Using dynamic soft reduction of continuous casting technology, realize that 82B wire rod ingredient, quality meet standard requirements.The invention only refers to 82B steel strand wires
Steel-smelting production process, be not directed to the rolling mill practice in later period, and also without proposing relevant corrosion resistance.
Summary of the invention
It is an object of the invention to overcome the above problem and it is insufficient and provide a kind of wire rod ingredient design rationally, continuous casting connects
It rolls, controlled rolling and controlled cooling, is produced on high-speed wire mill, the corrosion rate for obtaining wire rod is lower than the 70% of 82B steel strand wires wire rod.
The object of the present invention is achieved like this:
A kind of high-strength Ni-Cr corrosion resisting steel wire rods for steel strands, the ingredient of the wire rod are as follows by weight percentage: C:
0.80%~0.85%, Si:0.15%~0.35%, Mn:0.60%~0.90%, P :≤0.025%, S :≤0.015%,
Cr:0.20%~0.30%, Ni:0.20%~0.30%, remaining is Fe and inevitable impurity element.
It is as follows that present component designs reason:
C:C is the most apparent element of solution strengthening effect in steel, is increased with C content, and intensity, the hardness of steel rise, plasticity,
Toughness decline；
Si:Si is higher content intensified element, but Si too high levels, is unfavorable for cold working plastic deformation, therefore the model of Si
Enclose is 0.15%~0.35%；
Mn:Mn plays solution strengthening and refined crystalline strengthening, and postpones pearlite and ferritic transformation, improves the intensity of steel
And work hardening ability.Therefore the range of Mn is 0.60~0.90%；
P:P easily causes the cold short of steel, is the one side unfavorable to steel performance；But P be improved in alloying element it is corrosion-resistant
The most effective element of performance, therefore, by P element control≤0.035%, beneficial to improving the corrosion resistance of steel.S is in steel
MnS easily generated, causes hot-short, therefore requires S content more fewer better；
Cr: by the way that suitable Cr is added, the pearlite piece interlamellar spacing for being suitble to drawing can be obtained, the tension for improving wire rod is strong
Degree, improves the plasticity and drawing property of wire rod, and improve corrosion resistance, therefore the composition range of Cr is 0.20%~0.30%.
Ni:Ni is austenite former, cooperates the high-temperature oxidation resistant for improving steel, stress corrosion ability with chromium, raising can
Plasticity, weldability and toughness etc., therefore the composition range of Ni is 0.20%~0.30%.
A kind of production method of high intensity Ni-Cr corrosion resisting steel wire rods for steel strands, process route are as follows: molten iron pretreatment-
Converter smelting-LF furnace refining-billet continuous casting-square billet tandem rolling-steel billet cleaning-heating-rolling-control is cold-finishing-inspection
It looks into-is put in storage；
(1) continuous casting: cross dimensions is the bloom of (250-350) * (350-450) mm, and the degree of superheat is not more than 30 DEG C, knot
Brilliant device electromagnetic agitation+solidification end electromagnetic agitation, M-EMS Current intensity are 400A-500A, solidification end electromagnetism
The defects of stir current intensity is 400A-600A, improves continuous casting billet internal segregation, shrinkage cavity, loose, non-metallic inclusion, improves
The quality and qualification rate of slab.
(2) bloom: being heated and is rolled into the steel billet of 100mm-200mm size, and detect a flaw to steel billet by tandem rolling,
Surface has the defects of crackle, scratch position to carry out reconditioning, guarantees billet surface zero defect.
(3) it rolls and controls cold:
(a) by heating steel billet to 1020 DEG C~1070 DEG C, 100min~150min, the poker temperature difference≤30 DEG C are kept the temperature；
(b) control start rolling temperature is 930 DEG C~980 DEG C, and entry temperature at finishing is 880 DEG C~930 DEG C, subtracts sizing entrance temperature
880 DEG C~930 DEG C, 850 DEG C~880 DEG C of laying temperature of degree；
(c) it controls cold: using the Stanermo wind-cooling linear type of cooling, controlling cooling rate of the wire rod before pearlitic transformation is 10
DEG C/s~12 DEG C/s, the control of pearlitic transformation temperature at 620 DEG C~670 DEG C, phase transformation cooling rate control in 1 DEG C/s~2.5 DEG C/s,
Cooling velocity is increased after phase transformation, and cooling velocity is controlled in 6 DEG C/s~9 DEG C/s.
Using the beneficial effects of the present invention are:
The chemical component of wire rod contains suitable Cr, Ni element in the present invention, improves the intensity and plasticity of wire rod, and has
Effect improves the corrosion resistance of wire rod, by the control technique made steel, rolled, obtains mechanical property, drawing processability, resistance to
The excellent wire rod of the service performances such as corrosive power.
Rolling Production of the present inventionCorrosion resisting steel wire rods for steel strands, tensile strength be 1150~
1250MPa, elongation percentage are 10~16%, reduction of area is 18~32%, and intensity and plasticity are good, are conducive to drawing deformation.In (96h
23 DEG C) under 5%NaCl solution immersion corrosion experimental condition, the corrosion rate of wire rod of the present invention is lower than the wire rod corruption of 82B steel strand wires
Lose the 70% of rate.
Specific embodiment
Below by embodiment, the present invention is further illustrated.
The embodiment of the present invention is smelted according to the component proportion of technical solution, is continuous casting, rolling, continuous annealing, smooth.
The ingredient of wire rod of the embodiment of the present invention and comparative example 82B steel strand wires is shown in Table 1.Wire rod of the embodiment of the present invention and comparative example 82B steel twist
The mechanics and corrosion resistance of line are shown in Table 2.
The ingredient (wt%) of 1 wire rod of the embodiment of the present invention of table and comparative example 82B steel strand wires
Implement one:
It is smelted according to corrosion resisting steel wire rods for steel strands invention ingredient, then pouring into cross dimensions is 280*380mm
Bloom, 28 DEG C of the degree of superheat, M-EMS Current intensity is 400A, and solidification end electromagnetic agitation current strength is
500A.The bloom of 280*380mm is heated to and is rolled into the steel billet that section is 155*155mm size, then steel billet is visited
Wound carries out reconditioning to surface defect positions.
After above-mentioned technique, qualified steel billet is obtained.Using qualified steel billet on high-speed rod-rolling mill.
RollingWire rod, rolling mill practice are as follows: by heating steel billet to 1030 DEG C, keeping the temperature 110min, the poker temperature difference
28℃；Controlling start rolling temperature is 960 DEG C, and entry temperature at finishing is 910 DEG C, subtracts 890 DEG C of sizing inlet temperature, laying temperature 860
℃；Using the Stanermo wind-cooling linear type of cooling, be cooled to 645 DEG C with 10 DEG C/s cooling rate, then control cooling rate be 1.5 DEG C/s into
Row pearlitic transformation increases cooling velocity after phase transformation, and cooling velocity control is terminated in 8 DEG C/s to cooling.
Implement two:
It is smelted according to corrosion resisting steel wire rods for steel strands invention ingredient, then pouring into cross dimensions is 280*380mm
Bloom, 26 DEG C of the degree of superheat, M-EMS Current intensity is 450A, and solidification end electromagnetic agitation current strength is
550A.The bloom of 280*380mm is heated to and is rolled into the steel billet that section is 155*155mm size, then steel billet is visited
Wound carries out reconditioning to surface defect positions.
After above-mentioned technique, qualified steel billet is obtained.Using qualified steel billet on high-speed rod-rolling mill.
RollingWire rod, rolling mill practice are as follows: by heating steel billet to 1040 DEG C, keeping the temperature 115min, the poker temperature difference
27℃；Controlling start rolling temperature is 950 DEG C, and entry temperature at finishing is 915 DEG C, subtracts 900 DEG C of sizing inlet temperature, laying temperature 870
℃；655 DEG C are cooled to 11 DEG C/s cooling rate, then controlling cooling rate is that 2 DEG C/s carries out pearlitic transformation, and cooling speed is increased after phase transformation
Degree terminates cooling velocity control in 7.5 DEG C/s to cooling.
Implement three:
It is smelted according to corrosion resisting steel wire rods for steel strands invention ingredient, then pouring into cross dimensions is 280*380mm
Bloom, 29 DEG C of the degree of superheat, M-EMS Current intensity is 500A, and solidification end electromagnetic agitation current strength is
450A.The bloom of 280*380mm is heated to and is rolled into the steel billet that section is 155*155mm size, then steel billet is visited
Wound carries out reconditioning to surface defect positions.
After above-mentioned technique, qualified steel billet is obtained.It is rolled on high-speed rod-rolling mill using qualified steel billetWire rod, rolling mill practice are as follows: by heating steel billet to 1040 DEG C, keep the temperature 100min, 28 DEG C of the poker temperature difference；Control open rolling
Temperature is 970 DEG C, and entry temperature at finishing is 920 DEG C, subtracts 910 DEG C of sizing inlet temperature, 880 DEG C of laying temperature；It is cold with 11 DEG C/s
Speed is cooled to 655 DEG C, and then controlling cooling rate is that 2 DEG C/s carries out pearlitic transformation, cooling velocity is increased after phase transformation, by cooling velocity
Control terminates in 8.5 DEG C/s to cooling.
The mechanics and corrosion resistance of 2 wire rod of the embodiment of the present invention of table and comparative example 82B steel strand wires
Claims (1)
1. a kind of production method of high-strength Ni-Cr corrosion resisting steel wire rods for steel strands, which is characterized in that the ingredient of the wire rod is by weight
Percentages are as follows: C:0.80%~0.85%, Si:0.15%~0.35%, Mn:0.60%~0.90%, P :≤
0.025%, S :≤0.015%, Cr:0.20%~0.30%, Ni:0.20%~0.30%, remaining is for Fe and inevitably
Impurity element；The production method of the high-strength Ni-Cr corrosion resisting steel wire rods for steel strands, molten iron pretreatment-converter smelting-LF
Furnace refining-billet continuous casting-square billet tandem rolling-steel billet cleaning-heating-rolling-control is cold-finishing-inspection-storage,
(1) continuous casting: cross dimensions is the bloom of (250-350) * (350-450) mm, and the degree of superheat is not more than 30 DEG C, crystallizer
Electromagnetic agitation+solidification end electromagnetic agitation, M-EMS Current intensity are 400A-500A, solidification end electromagnetic agitation
Current strength is 400A-600A；
(2) bloom: being heated and is rolled into the steel billet of 100mm-200mm size by square billet tandem rolling, and guarantees that billet surface is intact
It falls into；
(3) it rolls and controls cold:
(a) by heating steel billet to 1020 DEG C~1070 DEG C, 100min~150min, the poker temperature difference≤30 DEG C are kept the temperature；
(b) control start rolling temperature is 930 DEG C~980 DEG C, and entry temperature at finishing is 880 DEG C~930 DEG C, subtracts sizing inlet temperature
880 DEG C~930 DEG C, 850 DEG C~880 DEG C of laying temperature；
(c) control cold: use the Stanermo wind-cooling linear type of cooling: control cooling rate of the wire rod before pearlitic transformation for 10 DEG C/s~
12 DEG C/s, cooling rate control is in 1 DEG C/s~2.5 DEG C/s at 620 DEG C~670 DEG C, phase transformation for the control of pearlitic transformation temperature, after phase transformation
Cooling velocity is increased, cooling velocity is controlled in 6 DEG C/s~9 DEG C/s.
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| CN201610329364.3A CN107400823B (en) | 2016-05-18 | 2016-05-18 | A kind of high-strength Ni-Cr corrosion resisting steel wire rods for steel strands and its production method |
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| CN109957728B (en) * | 2017-12-14 | 2021-02-23 | 鞍钢股份有限公司 | Weather-resistant cold heading steel wire rod for 800 MPa-level fastener and production method thereof |
| CN110624951B (en) * | 2019-08-27 | 2021-01-15 | 江苏省沙钢钢铁研究院有限公司 | Production method of high-strength cord steel square billet |
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