CN114395726A - High-strength high-toughness wire rod for anti-skid chain and production method thereof - Google Patents
High-strength high-toughness wire rod for anti-skid chain and production method thereof Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 238000000034 method Methods 0.000 claims abstract description 27
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 47
- 239000010959 steel Substances 0.000 claims description 47
- 238000010438 heat treatment Methods 0.000 claims description 26
- 238000005096 rolling process Methods 0.000 claims description 18
- 229910000859 α-Fe Inorganic materials 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 14
- 239000011651 chromium Substances 0.000 claims description 13
- 238000004321 preservation Methods 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 239000011572 manganese Substances 0.000 claims description 8
- 238000007670 refining Methods 0.000 claims description 8
- 238000009847 ladle furnace Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 238000009987 spinning Methods 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- 235000019738 Limestone Nutrition 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 239000010436 fluorite Substances 0.000 claims description 3
- 238000005098 hot rolling Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000006028 limestone Substances 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 6
- 238000005482 strain hardening Methods 0.000 abstract description 4
- 238000000137 annealing Methods 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- 239000000243 solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
The application discloses a wire rod for a high-strength high-toughness anti-skid chain, which comprises the following components in percentage by weight: c: 0.15 to 0.20%, Si: less than or equal to 0.10 percent, Mn: 0.60-0.90%, P: less than or equal to 0.025 percent, S: less than or equal to 0.025 percent, Al: 0.020-0.045%, B: 0.0010-0.0050%, Cr: 0.15-0.30% of Fe and inevitable impurities as the rest; the wire rod has the technical key points that the wire rod has reasonable components, the tensile strength is controlled to be 470-520 MPa, and the wire rod has good plasticity indexes; meanwhile, in order to improve the early-stage processing performance of the material, the content of Si element is further reduced, and the work hardening rate of a user in the use process is reduced; adding Al element to improve cold deformability; adding a proper amount of Cr element to improve the tensile strength of the finished product of the anti-skid chain; the hot-rolled wire rod has excellent processing performance, can meet the requirement of large deformation drawing processing in a non-annealing state, saves energy and is convenient to use; the finished product of the antiskid chain has high strength and good toughness, and meets the standard of the antiskid chain for heavy trucks.
Description
Technical Field
The invention belongs to the technical field of wire rods for anti-skid chains and production thereof, and particularly relates to a high-strength high-toughness wire rod for an anti-skid chain and a production method thereof.
Background
The anti-skid chains are mainly used in export europe, north america and the like, and the steel grades mainly used for manufacturing the anti-skid chains in the market are Q215, 20Mn2A and the prior patents: CN202010604510.5 Steel for automobile anti-skid chains in alpine regions and converter smelting process thereof (the steel is not available in the market);
the cross section of the antiskid chain product in the market is mostly in a shape of D, the requirement is that the hot-rolled wire rod has good processability without heat treatment in the early stage, the content of C in the component is controlled to be 0.20% or less for obtaining a steel material with good plasticity, and the content of C disclosed by CN202010604510.5 steel for automobile antiskid chains in alpine regions and converter smelting process thereof is 0.60-0.65%, and the hot-rolled state of the steel material does not have good plasticity index;
in addition, although Q215 has good plasticity, the tensile strength of the final product of the antiskid chain is low, and the requirement of the high-strength antiskid chain of the heavy truck cannot be met; the 20Mn2A strength can meet the requirements of users, but the component C content is 0.17-0.24%, the Mn content is 1.40-1.80%, the tensile strength of the hot rolled wire rod is about 600MPa, the material is easy to generate crack defects during large deformation drawing processing, the users need early-stage annealing treatment, a large amount of energy is consumed, and the production cost is increased.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a wire rod for a high-strength high-toughness anti-skid chain and a production method thereof, which solve the problems in the prior art.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
the wire rod for the high-strength high-toughness anti-skid chain comprises the following components in percentage by weight:
c: 0.15 to 0.20%, Si: less than or equal to 0.10 percent, Mn: 0.60-0.90%, P: less than or equal to 0.025 percent, S: less than or equal to 0.025 percent, Al: 0.020-0.045%, B: 0.0010-0.0050%, Cr: 0.15-0.30%, and the balance of Fe and inevitable impurities.
Furthermore, the tensile strength of the wire rod in a hot rolling state is 470-520 MPa, the reduction of area is more than or equal to 50%, and the ferrite grain size is 9.5-10.5 grade.
Further, the production method of the wire rod comprises the following steps:
s1, a converter/electric furnace,
putting molten iron and cleaned scrap steel into a converter, mixing limestone, light burning, return fine and fluorite, using the mixed substances as additives to produce oxidizing slag, and removing P, S and Si elements in the molten steel;
s2, refining in an LF (ladle furnace),
molten steel arrives at a station, steel core aluminum is used for deoxidation, and according to actual detection components, 30-80 Kg of carburant, 1100-1300 Kg of high-carbon manganese, 300-450 Kg of high-carbon chromium, 20-30 Kg of ferroboron and 25-30 Kg of ferroboron alloy are added to ensure that the components meet final control requirements;
s3, continuously casting the steel wire,
the tundish upper nozzle adopts a large-caliber nozzle with at least phi 28mm, the superheat degree of molten steel is controlled at 25-38 ℃, the normal casting speed is 2.5m/min, and the water quantity of a crystallizer is 150m 3/h; the secondary cooling is carried out at a rate of 0.7L/kg.
S4, heating the furnace,
the square billet is cold-packed, so that cracks and mixed crystal tissues are avoided; and heating with a heating furnace for 120 min.
S5, rolling the steel plate,
the high-speed wire rolling mill is adopted during rolling, the initial rolling temperature is 950-1010 ℃, high-pressure water is adopted for descaling after blanks are discharged from the furnace, the inlet temperature of the finishing mill is 900-940 ℃, the inlet temperature of the reducing diameter is controlled at 860-900 ℃, and the spinning temperature is controlled at 860-900 ℃.
S6, cooling by a stelmor line,
according to the specification phi of the wire rod being 5.5 mm-22 mm, the speed of the matched stelmor line roller way is determined to be 6.0-20 m/min, meanwhile, part of the heat preservation covers are opened, 1-6 sections of the heat preservation covers are opened according to the specification, the rest of the heat preservation covers are closed, and the fan is completely closed.
Further, in the S1,
final control requirements of the converter:
1) the end point C is more than or equal to 0.07 percent, the P is less than or equal to 0.015 percent, and the Si is less than or equal to 0.01 percent;
2) the tapping temperature is 1620-1660 ℃.
Further, in the S2,
the refining time is more than or equal to 35min, and the white slag retention time is more than or equal to 15 min; and strictly forbidding the operation of the residual pouring, and feeding the pure calcium wire for 200-400 m.
Further, in the S3,
it is necessary to use an electromagnetic stirrer, which employs M-EMS: 200A × 5 Hz.
Further, in the S4,
when the heating furnace is used for heating, the temperature of the heating section is 980-1040 ℃, and the temperature of the soaking section is 1060-1120 ℃.
Further, in the S6,
the stelmor line adopts a cooling control process and is used for realizing the tensile strength of the wire rod of 470-520 MPa and the ferrite grain size of 9.5-10.5 grades.
(III) advantageous effects
The wire rod has the advantages that the wire rod has reasonable components, the tensile strength is controlled to be 470-520 MPa, and the wire rod has good plasticity indexes; meanwhile, in order to improve the early-stage processing performance of the material, the content of Si element is further reduced, and the work hardening rate of a user in the use process is reduced;
adding Al element to improve cold deformability;
adding a proper amount of Cr element to improve the tensile strength of the finished product of the anti-skid chain;
the added Cr and B elements improve the hardenability of large specification, simultaneously improve the process adaptability and meet the heat treatment process of the final finished product of a user;
through controlled rolling and controlled cooling, a more balanced structure is obtained, the ferrite grain size is controlled to be 9.5-10.5 grade, better strength and plasticity matching is achieved, and heat treatment processing of a final product of a user is facilitated.
Drawings
FIG. 1 is a gold photograph of the product of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In addition, for the convenience of description, the terms "upper", "lower", "left" and "right" are used to refer to the same direction as the upper, lower, left, right, etc. of the drawings, and the terms "first", "second", etc. are used for descriptive distinction and have no special meaning.
The embodiment of the application:
aiming at the problems in the prior art, the invention provides a wire rod for a high-strength high-toughness anti-skid chain, which comprises the following components in percentage by weight:
c: 0.15 to 0.20%, Si: less than or equal to 0.10 percent, Mn: 0.60-0.90%, P: less than or equal to 0.025 percent, S: less than or equal to 0.025 percent, Al: 0.020-0.045%, B: 0.0010-0.0050%, Cr: 0.15-0.30%, and the balance of Fe and inevitable impurities.
Specifically, the content of the C element in the steel grade is adjusted in the form of a carburant by the C element;
wherein, the C element plays an important role in the performance of steel; as the carbon content increases, the hardness and strength of the steel are improved; but the toughness and plasticity are reduced, and the drawing deformation processing capability is deteriorated; therefore, the content of C in the steel needs to be strictly controlled, and the processing performance of the steel is matched with the strength of the finished product anti-skid chain after heat treatment; adjusting the content of C element in steel in the form of carburant;
the Mn element mainly has a solid solution strengthening effect and can reduce the gamma-alpha phase transition temperature so as to refine ferrite grains, and the Mn element can improve the toughness and reduce the ductile-brittle transition temperature; adjusting the content of Mn element in steel in the form of high-carbon manganese alloy;
wherein, Al element has strong affinity and is a deoxidizer in steel making; al can refine the essential grains of the steel, and plays a role in refining the grains and ensuring the uniformity of the structure; the Al element content of the steel grade is adjusted and reduced by adding steel core aluminum;
cr is an element which can improve the hardenability of the steel and obviously improve the strength, and under the condition of low C content, a proper amount of Cr is added to ensure that the steel achieves the required strength; adjusting the content of Cr element in steel by adding high-carbon ferrochrome;
wherein, the B element mainly acts to inhibit coarse ferrite along grain boundaries; the solid-dissolved B is precipitated on austenite grain boundaries, so that the interface energy can be effectively reduced, the ferrite forming temperature is reduced, the generation of grain boundary ferrite is favorably inhibited, and the hardenability of steel can be improved; the content of B element in steel is adjusted by adding ferroboron.
A high-strength high-toughness wire rod for an antiskid chain is produced by the following steps:
s1, a converter/electric furnace,
putting molten iron and cleaned scrap steel into a converter, mixing limestone, light burning, return fine and fluorite, using the mixed substances as additives to produce oxidizing slag, and removing P, S and Si elements in the molten steel;
the final control requirements of the converter are as follows:
1) the end point C is more than or equal to 0.07 percent, the P is less than or equal to 0.015 percent, and the Si is less than or equal to 0.01 percent;
2) the tapping temperature is 1620-1660 ℃.
In particular, the method comprises the following steps of,
si element is added as a deoxidizer in the low-alloy high-strength steel, and Si has strong solid solution strengthening effect after being dissolved in ferrite, so that the strength of the ferrite is improved; but Si obtains higher dislocation density in ferrite, thereby improving the work hardening rate and being unfavorable for the processing with large deformation amount at the later stage;
p can obviously reduce the low-temperature impact toughness of the steel and improve the brittle transition temperature of the steel; particularly at low temperatures, this phenomenon is called cold shortness; the element needs to be limited and removed by the process;
s is harmful impurities in steel, and the steel with high sulfur content is easy to crack under the condition of high-temperature pressure processing, and is generally called as hot brittleness; based on the fatigue resistance design, a low S design is adopted; this element needs to be limited and removed by the process.
S2, refining in an LF (ladle furnace),
molten steel arrives at a station, steel core aluminum is used for deoxidation, and according to actual detection components, 30-80 Kg of carburant, 1100-1300 Kg of high-carbon manganese, 300-450 Kg of high-carbon chromium, 20-30 Kg of ferroboron and 25-30 Kg of ferroboron alloy are added to ensure that the components meet final control requirements;
the refining time is more than or equal to 35min, and the white slag retention time is more than or equal to 15 min; and strictly forbidding the operation of the residual pouring, and feeding the pure calcium wire for 200-400 m.
S3, continuously casting the steel wire,
the tundish upper nozzle adopts a large-caliber nozzle with at least phi 28mm, the superheat degree of molten steel is controlled at 25-38 ℃, the normal casting speed is 2.5m/min, and the water quantity of a crystallizer is 150m3H; secondary cooling is carried out at a rate of 0.7L/kg;
it is necessary to use an electromagnetic stirrer, which employs M-EMS: 200A × 5 Hz.
S4, heating the furnace,
the square billet is cold-packed, so that cracks and mixed crystal tissues are avoided; heating with a heating furnace for 120 min; when the heating furnace is used for heating, the temperature of the heating section is 980-1040 ℃, and the temperature of the soaking section is 1060-1120 ℃.
S5, rolling the steel plate,
the high-speed wire rolling mill is adopted during rolling, the initial rolling temperature is 950-1010 ℃, high-pressure water is adopted for descaling after blanks are discharged from the furnace, the inlet temperature of the finishing mill is 900-940 ℃, the inlet temperature of the reducing diameter is controlled at 860-900 ℃, and the spinning temperature is controlled at 860-900 ℃.
S6, cooling by a stelmor line,
according to the specification phi of the wire rod being 5.5 mm-22 mm, the speed of the matched stelmor line roller way is determined to be 6.0-20 m/min, meanwhile, part of the heat preservation covers are opened, 1-6 sections of the heat preservation covers are opened according to the specification, the rest of the heat preservation covers are closed, and the fan is completely closed.
After the whole production process, the tensile strength of the wire rod in a hot rolling state is 470-520 MPa, the reduction of area is more than or equal to 50%, and the ferrite grain size is 9.5-10.5 grade.
The control of the strength and grain size is achieved for the purpose of rolling control and cooling control:
the billet heating soaking temperature is 1060-1120 ℃, the initial rolling temperature is 950-1010 ℃, the billet is descaled by high-pressure water after being discharged from a furnace, the inlet temperature of a finishing mill is 900-940 ℃, the inlet temperature of a reducing diameter is controlled at 860-900 ℃, and the spinning temperature is controlled at 860-900 ℃; a stelmor line adopts a controlled cooling process, the matched stelmor line roller path speed is determined according to the specification of the wire rod, meanwhile, part of heat preservation covers are opened, the rest heat preservation covers are closed, and all fans are closed; controlling the temperature and the cooling speed to realize the tensile strength of 470-520 MPa and the ferrite grain size of 9.5-10.5 grade;
by adopting the technical scheme:
1) the hot-rolled wire rod has excellent processing performance, can meet the requirement of large deformation drawing processing in a non-annealing state, saves energy and is convenient to use; 2) the finished product of the antiskid chain has high strength and good toughness, and meets the standard of the antiskid chain for heavy trucks.
In addition, the components increase Ti element: 0.030-0.050%, and the performance of the anti-skid chain produced by the method can still meet the requirements of the anti-skid chain.
The properties of the examples of the present invention are shown in table 3 and figure 1,
table 1: examples chemical composition of wire rod, wt.%
| Examples | C | Si | Mn | P | S | Cr | Al | B |
| 1 | 0.19 | 0.06 | 0.88 | 0.018 | 0.003 | 0.21 | 0.028 | 0.0024 |
| 2 | 0.18 | 0.08 | 0.82 | 0.020 | 0.004 | 0.19 | 0.038 | 0.0021 |
| 3 | 0.18 | 0.07 | 0.86 | 0.015 | 0.004 | 0.20 | 0.032 | 0.0028 |
The preparation method of the embodiment of the invention can be summarized as follows: a first mill 100t converter → LF furnace refining → 150mm × 150mm square billet → high-speed wire rod unit (heating → rough rolling → medium rolling → finish rolling → sizing → spinning → stelmor line cooling → coil collection → inspection → warehousing);
the specific process control is shown in table 2,
table 2:
TABLE 2
TABLE 2
TABLE 2
Table 3:
from the above table, it can be seen that:
the composition and the control process of the wire rod and the structure and the performance of the obtained product play an important role in improving the hot-rolled processing performance of the wire rod and simultaneously avoiding the generation of mixed crystal structures. The obtained final anti-skid chain product has high strength, uniform section hardness and excellent wear resistance.
By adopting the technical scheme:
the wire rod has the advantages that the wire rod has reasonable components, the tensile strength is controlled to be 470-520 MPa, and the wire rod has good plasticity indexes; meanwhile, in order to improve the early-stage processing performance of the material, the content of Si element is further reduced, and the work hardening rate of a user in the use process is reduced;
adding Al element to improve cold deformability;
adding a proper amount of Cr element to improve the tensile strength of the finished product of the anti-skid chain;
the added Cr and B elements improve the hardenability of large specification, simultaneously improve the process adaptability and meet the heat treatment process of the final finished product of a user;
through controlled rolling and controlled cooling, a more balanced structure is obtained, the ferrite grain size is controlled to be 9.5-10.5 grade, better strength and plasticity matching is achieved, and heat treatment processing of a final product of a user is facilitated.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
1. The wire rod for the high-strength high-toughness anti-skid chain is characterized by comprising the following components in percentage by weight:
c: 0.15 to 0.20%, Si: less than or equal to 0.10 percent, Mn: 0.60-0.90%, P: less than or equal to 0.025 percent, S: less than or equal to 0.025 percent, Al: 0.020-0.045%, B: 0.0010-0.0050%, Cr: 0.15-0.30%, and the balance of Fe and inevitable impurities.
2. The wire rod for a high strength and high toughness snow chain according to claim 1, wherein: the tensile strength of the wire rod in a hot rolling state is 470-520 MPa, the reduction of area is more than or equal to 50%, and the ferrite grain size is 9.5-10.5 grade.
3. The wire rod for a high strength and high toughness snow chain according to claim 1, wherein: the production method of the wire rod comprises the following steps:
s1, a converter/electric furnace,
putting molten iron and cleaned scrap steel into a converter, mixing limestone, light burning, return fine and fluorite, using the mixed substances as additives to produce oxidizing slag, and removing P, S and Si elements in the molten steel;
s2, refining in an LF (ladle furnace),
molten steel arrives at a station, steel core aluminum is used for deoxidation, and according to actual detection components, 30-80 Kg of carburant, 1100-1300 Kg of high-carbon manganese, 300-450 Kg of high-carbon chromium, 20-30 Kg of ferroboron and 25-30 Kg of ferroboron alloy are added to ensure that the components meet final control requirements;
s3, continuously casting the steel wire,
the tundish upper nozzle adopts a large-diameter nozzle with at least phi 28mm, the superheat degree of molten steel is controlled at 25-38 ℃, the normal casting speed is 2.5m/min, and the water quantity of a crystallizer is 150m3H; secondary cooling is carried out at a rate of 0.7L/kg;
s4, heating the furnace,
the square billet is cold-packed, so that cracks and mixed crystal tissues are avoided; heating with a heating furnace for 120 min;
s5, rolling the steel plate,
when rolling, a high-speed wire mill is adopted, the initial rolling temperature is 950-1010 ℃, the high-pressure water is adopted for descaling after the blank is discharged from a furnace, the inlet temperature of a finishing mill is 900-940 ℃, the inlet temperature of a reducing diameter is controlled at 860-900 ℃, and the spinning temperature is controlled at 860-900 ℃;
s6, cooling by a stelmor line,
according to the specification phi of the wire rod being 5.5 mm-22 mm, the speed of the matched stelmor line roller way is determined to be 6.0-20 m/min, meanwhile, part of the heat preservation covers are opened, 1-6 sections of the heat preservation covers are opened according to the specification, the rest of the heat preservation covers are closed, and the fan is completely closed.
4. The method for producing a wire rod for a high-strength high-toughness anti-skid chain according to claim 3, wherein the method comprises the following steps: in the above-mentioned S1, the method,
final control requirements of the converter:
1) the end point C is more than or equal to 0.07 percent, the P is less than or equal to 0.015 percent, and the Si is less than or equal to 0.01 percent;
2) the tapping temperature is 1620-1660 ℃.
5. The method for producing a wire rod for a high-strength high-toughness anti-skid chain according to claim 3, wherein the method comprises the following steps: in the above-mentioned S2, the method,
the refining time is more than or equal to 35min, and the white slag retention time is more than or equal to 15 min; and strictly forbidding the operation of the residual pouring, and feeding the pure calcium wire for 200-400 m.
6. The method for producing a wire rod for a high-strength high-toughness anti-skid chain according to claim 3, wherein the method comprises the following steps: in the above-mentioned S3, the method,
it is necessary to use an electromagnetic stirrer, which employs M-EMS: 200A × 5 Hz.
7. The method for producing a wire rod for a high-strength high-toughness anti-skid chain according to claim 3, wherein the method comprises the following steps: in the above-mentioned S4, the method,
when the heating furnace is used for heating, the temperature of the heating section is 980-1040 ℃, and the temperature of the soaking section is 1060-1120 ℃.
8. The method for producing the high-strength high-toughness anti-skid chain wire rod according to claim 3, wherein the method comprises the following steps: in the above-mentioned S6, the method,
the stelmor line adopts a cooling control process and is used for realizing the tensile strength of the wire rod of 470-520 MPa and the ferrite grain size of 9.5-10.5 grades.
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| CN202111446420.9A CN114395726A (en) | 2021-11-30 | 2021-11-30 | High-strength high-toughness wire rod for anti-skid chain and production method thereof |
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| CN107447157A (en) * | 2017-08-02 | 2017-12-08 | 首钢水城钢铁（集团）有限责任公司 | A kind of cold-forging steel and its manufacturing process |
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| CN103469078A (en) * | 2013-08-23 | 2013-12-25 | 安阳钢铁股份有限公司 | Rolled steel wire used on 70 kg-grade round-link chain and preparation method of rolled steel wire |
| CN105886937A (en) * | 2016-05-31 | 2016-08-24 | 安阳钢铁股份有限公司 | Low-cost and ultrahigh-strength steel wire rod for round-link chain and manufacturing method of low-cost and ultrahigh-strength steel wire rod |
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