CN109957728B - Weather-resistant cold heading steel wire rod for 800 MPa-level fastener and production method thereof - Google Patents
Weather-resistant cold heading steel wire rod for 800 MPa-level fastener and production method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/18—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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- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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Abstract
The invention provides an 800 MPa-grade high-strength weather-resistant cold heading steel wire rod and a production method thereof, wherein the wire rod comprises the following components in percentage by weight: c: 0.15% -0.30%, Si: 0.10-0.40%, Mn: 0.80% -1.20%, P: less than or equal to 0.035%, S: less than or equal to 0.040%, Cr: 0.30% -0.70%, Ni: 0.25-0.55%, Cu: 0.15% -0.40%, V: 0.02-0.10 percent of the total weight of the alloy, and the balance of Fe and inevitable impurity elements. The production method comprises the steps of molten iron pretreatment, converter smelting, LF furnace refining, VD, square billet continuous casting, square billet continuous rolling, billet cleaning, heating, rolling, controlled cooling and finishing, and all performances of the 800 MPa-level weather-resistant connecting pair manufactured by the cold heading steel wire rod meet the standard requirements, and the corrosion rate in an accelerated corrosion test is lower than 1/3 of common cold heading steel.
Description
Technical Field
The invention belongs to the field of ferrous metallurgy, and particularly relates to a weather-resistant cold-heading steel wire rod for an 800 MPa-level fastener and a production method thereof.
Background
Compared with a reinforced concrete structure, the steel structure is gradually more widely applied due to the advantages of simple and convenient assembly, recoverability, environmental friendliness and the like, besides traditional transmission towers and wind power towers, the application of the steel structure to the bridge is more and more, and the proportion of the steel structure bridge to a newly-built bridge is more than 90% in European and American countries at present. However, the steel structure needs to face an important problem, namely corrosion, and for common structural steel, due to the fact that the structure of a corrosion product on the surface of the steel structure is loose, corrosion can be continuously promoted to the inside of a base body along the interface of a corrosion layer and the base body, so that the service life of the steel structure is greatly shortened, and potential safety hazards are generated. In order to solve the above problems, surface painting or plating may be used to increase corrosion resistance, but the former requires continuous maintenance, and the latter loses protection after the plating layer is damaged by external factors, so that it is necessary to develop a material for corrosion resistance of a steel structural body. At present, the corrosion-resistant materials of plates for bridges and sections for iron frames are widely researched, but the research work on weather-resistant cold heading steel for producing fasteners is less.
The invention discloses an atmospheric corrosion resistant cold heading steel hot rolled wire rod and a production method thereof (application number: 201610129356.4), and the atmospheric corrosion resistant cold heading steel hot rolled wire rod comprises the following components in percentage by weight: 0.12-0.18% of C, 0.15-0.35% of Si, 0.60-0.90% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 0.70-0.90% of Cr, 0.20-0.50% of Ni, 0.20-0.50% of Cu, and the balance of iron and trace impurities. However, the C, Mn content in the composition range of the invention is lower than that of C, Mn element in the common 8.8-grade cold heading steel wire rod, so that the requirement of 8.8-grade fasteners on strength can be met, and the safety problem is caused if the strength requirement is met by reducing the tempering temperature.
The invention discloses a preparation method of high-strength annealing-free cold heading steel with atmospheric corrosion resistance (application number: 201310290465.0), which comprises the following steps of melting, oxidizing, detecting alloy components, adjusting, refining, casting, hot rolling and heat treatment, wherein the weight percentage of the chemical elements is as follows: 0.35-0.50 of C, 0.45-0.55 of silicon, 0.25-0.356 of manganese, 0.005-0.025 of phosphorus, 0.005-0.02 of sulfur, 0.35-0.55 of chromium, 0.65-0.80 of copper, 1.0-1.2 of zinc, 0.2-0.3 of tungsten, 0.19-0.22 of Bi0.19, 0.01-0.02 of Yb0.01, 0.08-0.12 of Ni0.12, 0.01-0.03 of Snd0.02-0.04 of Gd0.12-0.18 of Dy0.12, and the balance of iron; the invention has the advantages that the surface of the material is resistant to oxidation corrosion in atmosphere and water environment, the service life is longer, the cold heading forming does not need annealing, the heat treatment is carried out, the metal consumption is small, but the strength is high, and the invention can be used for processing 8.8-grade bolts and matched nuts; compared with the common medium and high strength cold heading steel, the carbon content is greatly reduced, and the welding performance is excellent. The material provided by the invention can meet the strength requirement of 8.8-grade bolts and matched nuts, but compared with the common 8.8-grade cold heading steel wire rod, the C, Si content is greatly improved, so that the processing performance of the material is deteriorated, and therefore, the processing performance must be improved by the heat treatment process provided by the invention. In addition, the invention adds a large amount of noble metals and rare earth elements, which inevitably greatly improves the production cost of the material, increases the difficulty of material popularization and limits the application range of the material.
Disclosure of Invention
The invention aims to overcome the problems and the defects and provide a weather-resistant cold heading steel wire rod for an 800 MPa-level fastener, which can meet the performance requirements of the 800 MPa-level high-strength fastener and has good corrosion resistance, and a production method thereof.
The purpose of the invention is realized as follows:
a weather-resistant cold heading steel wire rod for an 800 MPa-level fastener comprises the following components in percentage by weight: c: 0.15% -0.30%, Si: 0.10-0.40%, Mn: 0.80% -1.20%, P: less than or equal to 0.035%, S: less than or equal to 0.040%, Cr: 0.30% -0.70%, Ni: 0.25-0.55%, Cu: 0.15% -0.40%, V: 0.02-0.10 percent of the total weight of the alloy, and the balance of Fe and inevitable impurity elements.
The invention has the following design reasons:
c: c is the most obvious element with solid solution strengthening effect in steel, the strength and hardness of the steel are increased along with the increase of the content of C, the plasticity and the toughness are reduced, and the C is used for meeting the strength requirement of 8.8-grade fasteners and has better hardenability and enough toughness, so the range of the C is defined as 0.15-0.30 percent;
si: si is a ferrite solid solution strengthening element and plays a role in deoxidation in the steelmaking process, but when the content of Si is too high, the solid solution strengthening effect is saturated, the stony desertification and the decarburization degree of the steel structure are increased, the austenite is easy to grow up by heating the billet at high temperature, the quenching structure is also relatively thick and is unfavorable for plasticity and toughness, so the range of Si is 0.10-0.40%;
mn: mn plays roles of solid solution strengthening and fine grain strengthening, delays the transformation of pearlite and ferrite, is an effective alloy element for improving hardenability, and is regulated to be 0.80-1.20% in order to ensure that the wire rod has better hardenability and proper strength;
p, S: p, S is a segregated impurity element, which is required to reach a lower level, wherein P is less than or equal to 0.035%, S is less than or equal to 0.040%
Cr: cr can remarkably improve the hardenability of steel, thereby reducing the interlayer spacing of pearlite pieces, refining the structure and improving the spheroidization process performance of cold forging steel. Meanwhile, Cr can improve the density and the adhesion capability of a corrosion layer on the surface of steel and improve the corrosion resistance of the material. Comprehensively considering the factors of strength, structure control, corrosion resistance and the like, and determining the component range of Cr to be 0.30-0.70%;
ni: ni is an austenite forming element, and is matched with chromium to improve the high-temperature oxidation resistance and stress corrosion resistance of steel, and improve the plasticity, weldability, toughness and the like. Therefore, the component range of Ni is 0.25 to 0.55 percent;
cu: the Cu can obviously improve the atmospheric corrosion resistance of the steel, so that a rust layer on the surface of the steel is compact and the adhesiveness is improved, and the cooperation of the Cu and the Cr can promote the formation of a surface passivation film, reduce the corrosion-induced sensitivity of a steel matrix and improve the corrosion resistance of the steel. Therefore, the Cu content is designed to be 0.15-0.40%;
v: v can inhibit the recrystallization of austenite and prevent the growth of manager in the rolling process, thereby refining ferrite grains and improving the obdurability of steel. In addition, V can increase the hardenability of steel, improves the homogeneity of the structure after hardening and tempering, and in order to ensure the safety of the high-strength fastener when the steel structure is used, the range of V is defined as: 0.02 to 0.10 percent.
The second technical scheme provided by the invention is a production method of a weather-resistant cold heading steel wire rod for an 800 MPa-level fastener, which comprises the following steps of molten iron pretreatment, converter smelting, LF furnace refining, VD, square billet continuous casting, square billet continuous rolling, billet cleaning, heating, rolling, cold control and finishing, wherein the factors influencing the cold heading performance of the cold heading steel mainly comprise segregation, inclusion, structure, surface quality and the like:
refining: manufacturing weakly alkaline slag by adopting pre-melted slag, wherein the refining time is 20-40 minutes, weakly blowing argon after refining, the argon flow is 150-fold at 250NL/min, the argon blowing time is 20-50 minutes, and standing is 20-50 minutes; thereby leading the inclusion to be plasticized and ensuring the inclusion with larger size to float and be removed fully.
Continuous casting: adopting bloom continuous casting, wherein the superheat degree is not more than 30 ℃, performing electromagnetic stirring on a crystallizer and performing electromagnetic stirring on a solidification tail end, wherein the electromagnetic stirring current intensity of the crystallizer is 400-500A, and the electromagnetic stirring current intensity of the solidification tail end is 400-600A;
continuous rolling: heating and rolling the large square billet into a small square billet; and flaw detection is carried out on the steel billet, and the defect positions of cracks, scratches and the like on the surface are polished to ensure that the surface of the steel billet is free of defects.
Rolling: the rolling specification of the invention is suitable for
The wire rod is made of a steel wire rod,
(1) the heating temperature of the steel billet is 1050-1200 ℃, the heating furnace adopts weak oxidizing atmosphere, the heat preservation time is 0.7-1.2min/mm according to the size of the steel billet, and the temperature difference of the whole strip is less than or equal to 30 ℃; making the steel billet fully austenitized and making the alloy elements solid-dissolved and homogenized.
(2) Controlling the initial rolling temperature to be 950-1020 ℃, the finish rolling inlet temperature to be 900-950 ℃ and the spinning temperature to be 850-950 ℃;
(3) and (3) cooling: and a slow cooling mode is adopted, and the average cooling speed is not higher than 1.0 ℃/s.
The invention has the beneficial effects that: produced by the invention
The high-strength weather-resistant cold heading steel wire rod has the tensile strength of 620-720 MPa, the elongation of 20-30%, the surface shrinkage of 50-70%, the level of various inclusions of not more than 1.5 and the depth of surface defects of not more than 0.05mm, and the 800MPa weather-resistant connecting pair manufactured by using the cold heading steel wire rod disclosed by the invention meets the standard requirements in all properties, and the corrosion rate in an accelerated corrosion test is lower than 1/3 of common cold heading steel.
Detailed Description
The present invention is further illustrated by the following examples.
According to the component proportion of the technical scheme, molten iron pretreatment, converter smelting, LF furnace refining, VD, square billet continuous casting, square billet continuous rolling, billet cleaning, heating, rolling, cooling control and finishing are carried out;
refining: manufacturing weakly alkaline slag by adopting pre-melted slag, wherein the refining time is 20-40 minutes, weakly blowing argon after refining, the argon flow is 150-fold at 250NL/min, the argon blowing time is 20-50 minutes, and standing is 20-50 minutes;
continuous casting: the method comprises the following steps of (280-310) 380-420 mm section size of a large square billet, wherein the superheat degree is not more than 30 ℃, electromagnetic stirring of a crystallizer and electromagnetic stirring of a solidification tail end are carried out, the electromagnetic stirring current intensity of the crystallizer is 400-500A, and the electromagnetic stirring current intensity of the solidification tail end is 400-600A;
continuous rolling: heating and rolling the large square billet into a small square billet with the size of 120-180 mm;
rolling:
(1) the heating temperature of the steel billet is 1050-1200 ℃, the heating furnace adopts weak oxidizing atmosphere, the temperature is kept for 100-150 min, and the temperature difference of the poker bars is less than or equal to 30 ℃;
(2) controlling the initial rolling temperature to be 950-1020 ℃, the finish rolling inlet temperature to be 900-950 ℃ and the spinning temperature to be 850-950 ℃;
(3) and (3) cooling: and a slow cooling mode is adopted, and the average cooling speed is not higher than 1.0 ℃/s.
The composition of the wire rod of the examples of the present invention is shown in Table 1. The performance indexes of the wire rod of the embodiment of the invention are shown in Table 2. The performance indexes of the bolts made of the wire rod of the embodiment of the invention are shown in Table 3. The corrosion rates of the wire rod of the embodiment of the invention and the common cold heading steel wire rod in the accelerated corrosion test are shown in Table 4.
TABLE 1 composition of wire rods of examples of the present invention (wt%)
| Examples | C | Si | Mn | P | S | Cr | Ni | Cu | V |
| 1 | 0.22 | 0.19 | 0.93 | 0.011 | 0.005 | 0.39 | 0.32 | 0.19 | 0.05 |
| 2 | 0.19 | 0.3 | 0.83 | 0.012 | 0.006 | 0.54 | 0.49 | 0.38 | 0.03 |
| 3 | 0.22 | 0.23 | 0.84 | 0.009 | 0.005 | 0.48 | 0.53 | 0.27 | 0.06 |
The first embodiment is as follows:
smelting is carried out according to the chemical components of the 800MPa grade weather-proof cold heading steel wire rod, refining time is 35 minutes, argon flow is 200NL/min, argon blowing time is 30 minutes, after standing for 25 minutes, the wire rod is fed on a machine to be cast into a large square billet with the cross section size of 280 x 380mm, the superheat degree is 27 ℃, the electromagnetic stirring current intensity of a crystallizer is 500A, and the electromagnetic stirring current intensity of a solidification tail end is 500A. Heating and rolling the 280 x 380mm large square billet into a billet with the cross section of 155 x 155mm, then carrying out flaw detection on the billet, and grinding the surface defect position. Then using qualified billet to roll in high-speed wire rod rolling mill
The wire rod is rolled by the following process: heating the steel billet to 1075 ℃, preserving heat for 110 minutes,the temperature difference of the poker bar is 26 ℃; the initial rolling temperature is controlled to 970 ℃, the finish rolling inlet temperature is controlled to 910 ℃, the spinning temperature is controlled to 915 ℃, and then slow cooling is carried out, wherein the cooling speed is 0.42 ℃/s.
Example two:
smelting is carried out according to the chemical components of the 800MPa grade weather-proof cold heading steel wire rod, refining time is 40 minutes, argon flow is 220NL/min, argon blowing time is 35 minutes, after standing for 30 minutes, the wire rod is fed on a machine to be cast into a large square billet with the cross section size of 280 x 380mm, the superheat degree is 28 ℃, the electromagnetic stirring current intensity of a crystallizer is 450A, and the electromagnetic stirring current intensity of a solidification tail end is 550A. Heating and rolling the 280 x 380mm large square billet into a billet with the cross section of 155 x 155mm, then carrying out flaw detection on the billet, and grinding the surface defect position. Then using qualified billet to roll in high-speed wire rod rolling mill
The wire rod is rolled by the following process: heating the billet to 1050 ℃, and preserving the temperature for 120 minutes, wherein the temperature difference of the whole noodle is 25 ℃; the initial rolling temperature is controlled to be 980 ℃, the finish rolling inlet temperature is 915 ℃, the spinning temperature is 910 ℃, and then the steel wire is slowly cooled at the cooling speed of 0.35 ℃/s.
Example three:
smelting is carried out according to the chemical components of the 800MPa grade weather-proof cold heading steel wire rod, refining time is 40 minutes, argon flow is 190NL/min, argon blowing time is 30 minutes, after standing for 40 minutes, the wire rod is fed on a machine to be cast into a large square billet with the cross section size of 280 x 380mm, the superheat degree is 28 ℃, the electromagnetic stirring current intensity of a crystallizer is 500A, and the electromagnetic stirring current intensity of a solidification tail end is 550A. Heating and rolling the 280 x 380mm large square billet into a billet with the cross section of 155 x 155mm, then carrying out flaw detection on the billet, and grinding the surface defect position. Then using qualified billet to roll in high-speed wire rod rolling mill
The wire rod is rolled by the following process: heating the steel billet to 1100 ℃, and preserving the heat for 120 minutes, wherein the temperature difference of the whole strip is 25 ℃; controlling the initial rolling temperature to be 930 ℃, the finish rolling inlet temperature to be 880 ℃, the spinning temperature to be 920 ℃, and then slowly cooling to the cooling speed of 0.40 ℃/s.
Table 2 performance index of wire rod of the embodiment of the present invention
TABLE 3 Performance index of bolts made with wire rods according to embodiments of the present invention
TABLE 4 Corrosion Rate (g/m) in accelerated Corrosion test of wire rods of examples of the present invention and ordinary Cold heading Steel wire rods2·h)
| Examples | 1 | 2 | 3 | Ordinary cold heading steel |
| Corrosion rate | 0.068097 | 0.041808 | 0.053093 | 0.217912 |
Note: weekly dipping for 72h, NaHSO3And (3) solution.
In order to express the present invention, the above embodiments are properly and fully described by way of examples, and the above embodiments are only used for illustrating the present invention and not for limiting the present invention, and those skilled in the relevant art can make various changes and modifications without departing from the spirit and scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made by the persons skilled in the relevant art should be included in the protection scope of the present invention, and the protection scope of the present invention should be defined by the claims.
Claims (1)
1. The weather-resistant cold heading steel wire rod for the 800 MPa-level fastener is characterized by comprising the following components in percentage by weight: c: 0.19 to 0.30%, Si: 0.10-0.40%, Mn: 0.93-1.20%, P: less than or equal to 0.035%, S: less than or equal to 0.040%, Cr: 0.30% -0.54%, Ni: 0.25-0.55%, Cu: 0.15% -0.40%, V: 0.02% -0.10%, and the balance of Fe and inevitable impurity elements; the production method of the weather-resistant cold heading steel wire rod for the 800 MPa-level fastener comprises the steps of molten iron pretreatment, converter smelting, LF furnace refining, VD, square billet continuous casting, square billet continuous rolling, billet cleaning, heating, rolling, cooling control and finishing,
refining: manufacturing weakly alkaline slag by adopting pre-melted slag, wherein the refining time is 20-40 minutes, weakly blowing argon after refining, the argon flow is 150-fold at 250NL/min, the argon blowing time is 20-50 minutes, and standing is 20-50 minutes;
continuous casting: adopting bloom continuous casting, wherein the superheat degree is not more than 30 ℃, performing electromagnetic stirring on a crystallizer and performing electromagnetic stirring on a solidification tail end, wherein the electromagnetic stirring current intensity of the crystallizer is 400-500A, and the electromagnetic stirring current intensity of the solidification tail end is 400-600A;
rolling:
(1) the heating temperature of the steel billet is 1050-1200 ℃, the heating furnace adopts weak oxidizing atmosphere, the heat preservation time is calculated according to the size of the steel billet and according to 0.7-1.2min/mm, and the temperature difference of the poker bars is less than or equal to 30 ℃;
(2) controlling the initial rolling temperature to be 950-1020 ℃, the finish rolling inlet temperature to be 900-950 ℃ and the spinning temperature to be 850-950 ℃;
(3) and (3) cooling: a slow cooling mode is adopted, and the average cooling speed is not higher than 1.0 ℃/s;
the tensile strength of the weather-resistant cold heading steel wire rod is 620-720 MPa, the elongation is 20-30%, the surface shrinkage is 50-70%, the level of various inclusions is not more than 1.5, and the depth of surface defects is not more than 0.05 mm.
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| CN110468331A (en) * | 2019-09-02 | 2019-11-19 | 鞍钢股份有限公司 | A kind of high-ductility alloy the cold heading steel and its production method |
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| CN112646958A (en) * | 2020-11-30 | 2021-04-13 | 中国科学院金属研究所 | Heat treatment process of low-alloy high-strength high-weather-resistance structural steel for highway guardrail |
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| CN106350734A (en) * | 2016-09-21 | 2017-01-25 | 邢台钢铁有限责任公司 | High-toughness non-tempering steel wire rod and preparation method thereof |
| CN107177803A (en) * | 2017-05-24 | 2017-09-19 | 首钢总公司 | Exempt from application the bridge structure high-strength bolt of resistance to industrial atmospheric steel and manufacture method |
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